CN110541897A - commercial vehicle electronic mechanical brake with clamping force retaining function - Google Patents

commercial vehicle electronic mechanical brake with clamping force retaining function Download PDF

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Publication number
CN110541897A
CN110541897A CN201910948045.4A CN201910948045A CN110541897A CN 110541897 A CN110541897 A CN 110541897A CN 201910948045 A CN201910948045 A CN 201910948045A CN 110541897 A CN110541897 A CN 110541897A
Authority
CN
China
Prior art keywords
push rod
snap ring
brake
electromagnet
clamping
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910948045.4A
Other languages
Chinese (zh)
Inventor
李静
吴桐
孟令帅
范天昕
何闫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jilin University
Original Assignee
Jilin University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jilin University filed Critical Jilin University
Priority to CN201910948045.4A priority Critical patent/CN110541897A/en
Publication of CN110541897A publication Critical patent/CN110541897A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
    • F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/02—Fluid pressure
    • F16D2121/04—Fluid pressure acting on a piston-type actuator, e.g. for liquid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/14—Mechanical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/18—Electric or magnetic
    • F16D2121/24—Electric or magnetic using motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2123/00—Multiple operation forces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/58—Mechanical mechanisms transmitting linear movement
    • F16D2125/70—Rods

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

The invention discloses a commercial vehicle electronic mechanical brake with a clamping force maintaining function, wherein a ball screw assembly is driven by a torque motor to sequentially drive a push rod assembly, a boosting assembly and a piston assembly to move, finally, a brake block of a disc brake is pushed by the piston assembly to press a brake disc to generate a braking force, the push rod assembly is also provided with the clamping force maintaining assembly, in the clamping force maintaining assembly, a front clamping ring is arranged on the rear end face of a brake caliper body, a second electromagnet is fixed on the front end face of a push rod seat, a rear clamping ring is fixed at the front end of the second electromagnet, a first electromagnet is arranged at the rear end of the rear clamping ring, the first electromagnet is connected with the second electromagnet through a spring, so that the first electromagnet is jacked on the rear clamping ring, and a matched bump and a clamping groove are arranged on the end face between the front clamping. The invention has better universality and safety, can realize the holding of clamping force and meets the requirements of parking braking.

Description

commercial vehicle electronic mechanical brake with clamping force retaining function
Technical Field
the invention belongs to the technical field of vehicle engineering, relates to an automobile drive-by-wire chassis and a drive-by-wire brake technology, and particularly relates to a commercial vehicle electronic mechanical brake with a clamping force maintaining function.
background
As the key for guaranteeing the active safety and the operation stability of energy-saving and new energy automobiles and intelligent networked automobiles, the brake-by-wire system has a simpler structure and more flexible control, can realize various braking states and braking modes, and is convenient to carry out integrated control with a power system, a steering system and a suspension system. In the field of commercial vehicle braking, compared with the traditional pneumatic braking, the electronic mechanical brake does not need large and complex pneumatic pipelines, air cylinders, air compressors, bridge control valves, proportional valves, relay valves and other elements, can effectively reduce the vehicle body mass and unsprung mass, and improves the operation stability of the vehicle; meanwhile, the response performance and the pressure control precision of the electronic mechanical brake system are superior to those of the traditional pneumatic brake system, and the functions of electronic parking brake, anti-lock brake, stability control, traction control, intelligent driving auxiliary brake, automatic driving brake and the like are conveniently integrated, so that the future development direction of the commercial vehicle brake system is provided.
In the existing technical scheme of the electronic mechanical brake system of the commercial vehicle, the structure of a brake caliper of a disc brake is mostly required to be changed, and the universality is poor; in the prior technical scheme, the push rod is designed into a fixed structure, and the push rod can be continuously subjected to bending stress in the process of pushing the boosting lever to move, so that the push rod can be broken, and the driving safety is endangered; the other technical scheme can not realize the maintenance of the brake clamping force, and needs to rely on the motor to block the rotation, which puts high requirements on the performance of the motor and ensures the reliability of the system difficultly.
disclosure of Invention
Aiming at the defects in the prior art, the invention provides the commercial vehicle electronic mechanical brake with the clamping force maintaining function, and the commercial vehicle electronic mechanical brake has better universality and safety, can maintain the clamping force and meets the parking braking requirement. The technical scheme of the invention is as follows by combining the attached drawings of the specification:
a commercial vehicle electronic mechanical brake with a clamping force retaining function comprises a disc brake, a shell, a torque motor, a ball screw pair assembly, a push rod assembly, a boosting assembly and a piston assembly, and further comprises a clamping force retaining assembly;
the clamping force maintaining assembly consists of a front clamping ring 8a, a rear clamping ring 8b, a first electromagnet 8c, a second electromagnet 8d, a spring 8e, a front clamping ring retainer 8f and a rear clamping ring retainer 8 g;
the front clamping ring 8a is arranged on the rear end face of a brake caliper body 1 of the disc brake through a front clamping ring retainer 8f, the second electromagnet 8d is fixed on the front end face of a push rod seat 9 of the push rod assembly, the rear clamping ring 8b is fixed at the front end of the second electromagnet 8d through a rear clamping ring retainer 8g, the first electromagnet 8c is arranged at the rear end of the rear clamping ring 8b, and the first electromagnet 8c is connected with the second electromagnet 8d through a spring 8 e;
the end face between the front snap ring 8a and the rear snap ring 8b is provided with a convex block and a clamping groove which are matched with each other, and the rear snap ring 8b moves forward under the driving of the push rod seat 9 and is fixedly clamped with the front snap ring 8a along the circumferential direction to realize interlocking.
Furthermore, the front snap ring retainer 8f is in an annular groove structure, the front snap ring retainer 8f is coaxially arranged with the push rod 7, the front snap ring 8a is installed in the annular groove of the front snap ring retainer 8f, and the front snap ring 8a can axially rotate relative to the front snap ring retainer 8 f;
the second electromagnet 8d is of an annular structure, and the second electromagnet 8d and the push rod 7 are coaxially arranged;
the rear snap ring retainer 8g is of an annular groove structure, the rear snap ring retainer 8g is arranged coaxially with the push rod 7, and the rear end face of the rear snap ring retainer 8g is fixed on the front end face of the second electromagnet 8 d;
the first electromagnet 8c is arranged in an annular groove of the rear snap ring retainer 8g, and the first electromagnet 8c is connected with the second electromagnet 8d through a spring 8 e;
The rear snap ring 8b is mounted in an annular groove of the rear snap ring holder 8g, and the rear snap ring 8b can axially rotate relative to the rear snap ring holder 8 g;
when no electromagnetic attraction force acts between the first electromagnet 8c and the second electromagnet 8d, the first electromagnet 8c is pressed against the rear end face of the rear snap ring 8b at the front end under the elastic action of the spring 8 e.
furthermore, the front snap ring 8a is of a circular structure, a circle of annular clamping groove is arranged at the axial middle position on the outer circumferential surface of the front snap ring 8a, and the front snap ring 8a is clamped with the inner edge of the annular groove of the front snap ring holder 8f through the annular clamping groove to realize axial fixation;
a plurality of wedge-shaped lugs are uniformly distributed on the rear end face of the front snap ring 8a, and inclined planes of the wedge-shaped lugs are sequentially arranged in the same direction along the circumferential direction;
the rear snap ring 8b is of a circular ring structure, a circle of annular clamping groove is formed in the axial middle position on the outer circumferential surface of the rear snap ring 8b, and the rear snap ring 8b is clamped with the inner edge of the annular groove of the rear snap ring retainer 8g through the annular clamping groove to realize axial fixation;
a plurality of wedge-shaped grooves are uniformly distributed on the front end face of the rear snap ring 8b, inclined planes of the wedge-shaped grooves are sequentially arranged in the same direction along the circumferential direction, and the wedge-shaped grooves are matched with the wedge-shaped lugs on the end face of the front snap ring 8a in a one-to-one correspondence manner.
Further, the torque motor 19 is mounted on the housing through a motor mounting disc 16, and a driving bevel gear 20 is coaxially mounted on an output shaft of the torque motor 19;
The ball screw pair assembly is composed of a ball screw pair screw 10, balls 11, a ball screw pair nut 13 and a driven bevel gear 12, the ball screw pair nut 13 is sleeved on the outer side of the ball screw pair screw 10 and is in transmission connection with the ball screw pair screw 10 through the balls 11 to form a ball screw pair, the outer side of the circumference of the ball screw pair nut 13 is supported and installed on an annular boss in the shell, the driven bevel gear 12 is coaxially and fixedly connected to the outer circumference of the ball screw pair nut 13 and moves synchronously with the ball screw pair nut 13, and the driven bevel gear 12 is in meshing connection with a driving bevel gear 20 at the output end of the torque motor 19.
Furthermore, the push rod assembly consists of a push rod 7 and a push rod seat 9, the rear end of the push rod seat 9 is fixedly connected with the front end face of a ball screw pair screw rod 10 of the ball screw pair assembly, a spherical groove is formed in the front end face of the push rod seat 9, the front end of the push rod 7 is an arc-shaped face, the front end of the push rod 7 penetrates through a through hole in the rear end face of the brake caliper body 1 to be in contact connection with the arc-shaped groove of a boosting lever 6 of the boosting assembly, and the rear end of the push rod 7 is a ball head end and is in contact connection with the spherical surface of the.
Furthermore, the main body of the outer side surface of the connecting rod of the push rod 7 is a cylindrical surface, two parallel planes are axially processed on the outer side surface of the connecting rod of the push rod 7, the shape of a through hole on the rear end surface of the brake caliper body 1 is matched with the shape of the radial section of the connecting rod of the push rod 7, the outer plane of the connecting rod of the push rod 7 is attached to the inner edge of the through hole of the brake caliper body 1, and a gap is reserved between the outer arc surface of the connecting rod of the push rod 7 and the inner edge of the through hole of the brake caliper body 1, so that after the push rod 7 penetrates through the through hole of the brake caliper body 1.
Further, piston assembly comprises brake block mounting disc 4a, piston 4b, cambered surface groove 4c and return spring 5, piston 4b installs in the mounting groove of brake calliper body 1, piston 4b front end has opened spring mounting groove along the axial, and piston 4 b's preceding terminal surface and brake block mounting disc 4a fixed connection, return spring 5 installs in piston 4 b's spring mounting groove, return spring 5's one end top leans on brake calliper body 1, return spring 5's the other end top leans on piston 4 b's spring mounting groove bottom, be equipped with cambered surface groove 4c at piston 4 b's rear end face.
furthermore, the force-increasing component consists of a force-increasing lever 6, a bearing roller 21 and a bearing bush 22, the rear end of the upper part of the force-increasing lever 6 is provided with an arc surface groove matched with the arc surface of the front end of the push rod 7 of the push rod component, the rear end of the lower part of the force-increasing lever 6 is provided with an arc surface bulge matched with the brake caliper body 1 of the disc brake, and the front end of the lower part of the force-increasing lever 6 is provided with an arc surface bulge matched with the piston 4 b;
The bearing bush 22 is arranged in an arc surface groove on the inner wall of the brake caliper body 1, an arc surface bulge at the rear end of the lower part of the force-increasing lever 6 is matched with the bearing bush 22, the bearing rollers 21 are uniformly distributed between the arc surface bulge at the rear end of the lower part of the force-increasing lever 6 and the bearing bush 22, and under the supporting and connecting action of the bearing rollers 21 and the bearing bush 22, the force-increasing lever 6 swings around the supporting center of the force-increasing lever relative to the brake caliper body 1;
the cambered surface bulge at the front end of the lower part of the force-increasing lever 6 is pressed in the cambered surface groove 4c at the rear end of the piston 4b, the contact point of the force-increasing lever 6 and the cambered surface groove 4c is eccentrically arranged with the support center of the force-increasing lever 6, and when the force-increasing lever 6 swings under the pushing of the push rod assembly, the piston 4b linearly moves along the axial direction under the driving of the force-increasing lever 6.
compared with the prior art, the invention has the beneficial effects that:
1. the electronic mechanical brake with the clamping force maintaining function for the commercial vehicle can meet the braking requirements of medium and large buses, trucks, other commercial vehicles and wheel type engineering machinery, has better universality, and is convenient for integrated control with other subsystems of a vehicle drive-by-wire chassis;
2. the swingable push rod assembly designed in the commercial vehicle electronic mechanical brake with the clamping force maintaining function can swing at a certain angle in space through the contact of the tail part of the push rod and the spherical surface of the push rod seat, the head end of the push rod can be better contacted with the upper end of the boosting lever in space, the push rod can be prevented from being broken due to larger bending stress when the boosting lever is pushed in the braking process, and the driving safety is effectively ensured;
3. The commercial vehicle electronic mechanical brake with the clamping force retaining function comprises the clamping force retaining device, and the clamping force can be retained for a long time under the condition of vehicle power failure through the cooperation of the front clamping ring, the rear clamping ring, the spring and the electromagnet, so that the parking braking requirement is met;
4. The commercial vehicle electronic mechanical brake with the clamping force maintaining function is free of a pressure sensor and a displacement sensor component, when the brake works, the brake pressure and the axial displacement of the push rod are estimated by a control system through a software algorithm, so that the axial size of the brake can be effectively shortened, and the installation condition of a vehicle can be better met;
5. The commercial vehicle electronic mechanical brake with the clamping force keeping function does not need to change the structure of the existing commercial vehicle disc brake, can be realized by replacing the brake air chamber of the existing commercial vehicle air pressure disc brake with the propelling mechanism, and has universality.
drawings
FIG. 1 is a front partial cross-sectional view of a commercial vehicle electromechanical brake having a clamping force retention arrangement in accordance with the present invention;
FIG. 2 is a top partial cross-sectional view of a commercial vehicle electromechanical brake having a clamping force retention device in accordance with the present invention;
FIG. 3 is an enlarged view, partially in section, of a clamping force retention assembly operating condition of a commercial vehicle electromechanical brake having a clamping force retention device in accordance with the present invention after energizing the electromagnet;
FIG. 4 is an enlarged view, partially in section, of the clamping force retention assembly operating condition of the commercial vehicle electromechanical brake with clamping force retention device of the present invention with the electromagnet de-energized;
FIG. 5a is a front view of a push rod of the electronic mechanical brake for a commercial vehicle having a clamping force retention device in accordance with the present invention;
FIG. 5b is a side view of a push rod of the commercial vehicle electromechanical brake with clamping force retention according to the present invention;
FIG. 5c is a top view of the push rod of the electronic mechanical brake for a commercial vehicle having a clamping force retention device in accordance with the present invention;
FIG. 6a is a front view of the power lever of the commercial vehicle electromechanical brake with a clamping force retention device in accordance with the present invention;
FIG. 6b is a side view of the power lever of the commercial vehicle electromechanical brake with a clamping force retention device in accordance with the present invention;
FIG. 6c is a top view of the power lever of the commercial vehicle electromechanical brake with clamping force retention according to the present invention;
FIG. 7a is a front view of a front snap ring of a commercial vehicle electromechanical brake having a clamping force retention arrangement in accordance with the present invention;
FIG. 7b is a top view of the front snap ring of the commercial vehicle electromechanical brake with clamping force retention according to the present invention;
FIG. 7c is a cross-sectional view of FIG. 7b A-A;
FIG. 8a is a front elevational view of a rear snap ring of a commercial vehicle electromechanical brake having a clamping force retention arrangement in accordance with the present invention;
FIG. 8b is a bottom view of a rear snap ring of a commercial vehicle electromechanical brake having a clamping force retention arrangement in accordance with the present invention;
Fig. 8c is a cross-sectional view of fig. 8B B-B.
In the figure:
1-brake caliper body, 2-brake block, 3-brake disc, 4 a-brake block mounting disc,
4 b-piston, 4 c-arc groove, 5-return spring, 6-force increasing lever,
7-a push rod, 8 a-a front snap ring, 8 b-a rear snap ring, 8 c-a first electromagnet,
8 d-a second electromagnet, 8 e-a spring, 8 f-a front snap ring retainer, 8 g-a rear snap ring retainer,
9-a push rod seat, 10-a ball screw pair screw rod, 11-a ball, 12-a driven bevel gear,
13-a ball screw pair nut, 14-a first bearing, 15-a second bearing, 16-a motor mounting disc,
17-front housing, 18-rear housing, 19-torque motor, 20-drive bevel gear,
21-roller, 22-bearing bush, 23-push rod mounting hole.
Detailed Description
For clearly and completely describing the technical scheme and the specific working process thereof, the specific implementation mode of the invention is as follows by combining the attached drawings of the specification:
as shown in fig. 1 and 2, the present invention discloses a commercial vehicle electromechanical brake with a clamping force maintaining function, comprising: a disc brake and a propulsion mechanism; the propelling mechanism consists of a shell, a torque motor, a ball screw pair assembly, a push rod assembly, a clamping force maintaining assembly, a boosting assembly and a piston assembly. In the propelling mechanism, the ball screw pair assembly drives the push rod assembly, the force boosting assembly and the piston assembly to move in sequence under the driving of the torque motor, finally the piston assembly pushes a brake block of the disc brake to press a brake disc to generate braking force, and in the process of generating the braking force, the clamping force maintaining assembly arranged on the push rod assembly can limit the movement of the push rod assembly so as to maintain the clamping force and realize parking braking.
As shown in fig. 1 and 2, the housing is composed of a front housing 17 and a rear housing 18 which are fixedly connected through bolts, and a circle of front housing inner edge is arranged in the axial middle of the front housing 17, wherein a housing front cavity is formed between the front housing inner edge and the front housing 17 at the front end, and a housing rear cavity is formed between the front housing inner edge and the front housing 17 at the rear end and the rear housing 18 at the front end; the front housing 17 is fixed on the rear end face of the brake caliper body 1 of the disc brake by bolts, and a through hole is formed in the rear end face of the brake caliper body 1.
As shown in fig. 1 and 2, the torque motor 19 is fixed on the motor mounting plate 16 by bolts and is mounted on the housing by the motor mounting plate 16; a driving bevel gear 20 is coaxially installed on an output shaft of the torque motor 19, and the torque motor 19 is meshed and connected with a driven bevel gear 12 positioned on the outer edge of a ball screw pair nut 13 through the driving bevel gear 20 so as to realize the transmission matching connection of the torque motor 19 and a ball screw pair component.
as shown in fig. 1 and 2, the ball screw assembly is installed in the rear cavity of the housing, and the ball screw assembly is composed of a ball screw assembly screw 10, balls 11, a ball screw assembly nut 13 and a driven bevel gear 12. The outer side of the ball screw pair nut 13 is supported and installed on annular bosses in a front shell 17 and a rear shell 18 through a first bearing 14 and a second bearing 15 respectively; the driven bevel gear 12 is coaxially arranged on the outer circumference of the ball screw pair nut 13 and moves synchronously with the ball screw pair nut 13, and the driven bevel gear 12 is meshed with a driving bevel gear 20 at the output end of the torque motor 19. When the torque motor 19 rotates, the driving bevel gear 20 drives the driven bevel gear 12 to rotate, the driven bevel gear 12 drives the ball screw pair nut 13 to synchronously rotate, and the ball screw pair screw 10 linearly moves along the axial direction and also rotationally moves along the axial direction under the driving of the ball screw pair nut 13.
As shown in fig. 1 and 2, the push rod assembly is installed in the front cavity of the housing, the front end of the push rod assembly is slidably connected with the boosting assembly, and the rear end of the push rod assembly is fixedly connected with the ball screw assembly. The push rod assembly consists of a push rod 7 and a push rod seat 9; the rear end of the push rod seat 9 is fixedly connected with the front end face of the ball screw pair screw 10, the front end face of the push rod seat 9 is provided with a groove, and the bottom of the groove is a spherical surface; the end face of the front end of the push rod 7 is an arc face, the front end of the push rod 7 penetrates through a through hole in the rear end face of the brake caliper body 1 and is in contact connection with an arc face groove in the upper end of the boosting lever 6 in the rear cavity of the brake caliper body 1, the rear end of the push rod 7 is a ball head end, and the ball head end of the push rod 7 is in contact connection with the groove spherical face of the push rod seat 9, so that a spherical friction pair relation with good fitting degree is formed between the push rod 7 and the push rod seat 9, and the push rod 7 can swing relative to the push rod seat 9 when being pushed by the ball screw pair screw 10 to move, so that the front end face of the push rod 7 is in good contact with the arc face in the upper end of the boosting lever 6, and.
As shown in fig. 1 and 2, as previously described: the ball screw assembly screw 10 linearly moves in the axial direction and also rotationally moves in the axial direction by the ball screw assembly nut 13. Therefore, under the driving of the ball screw pair screw 10, the push rod seat 9 will also move linearly along the axial direction along with the ball screw pair screw 10 and also rotate along the axial direction. However, in the brake structure according to the present invention, it is only necessary to transmit the linear motion in the axial direction to the push rod 7 through the push rod holder 9, and the rotational motion in the axial direction is not transmitted, so the present application has reached the above-mentioned purpose of motion by modifying the structure of the push rod 7.
As shown in fig. 5a, 5b and 5c, the rear end ball end of the push rod 7 is in contact connection with the groove spherical surface of the push rod seat 7, the main body of the outer side surface of the connecting rod of the push rod 7 is a cylindrical surface, wherein two planes, namely a plane i and a plane ii, are axially processed on the outer side surface of the connecting rod of the push rod 7, the plane i and the plane ii are symmetrical about the central axis plane of the push rod 7, so that the cross section of the connecting rod of the push rod 7 is in an oblong shape with symmetrical arcs at the upper part and the lower part and parallel straight lines at the left part and the right part, the front end of the push rod 7 forms a corresponding arc surface, the front end of the push rod 7 penetrates through a through hole on the rear end surface of the brake caliper body 1, the shape of the through hole on the rear end surface of the brake caliper body 1 is matched with the radial cross section of the connecting rod of the push rod 7, that is the through hole on the rear end The distance is the same, and the distance between the symmetrical arcs of the oblong hole of the brake caliper body 1 is greater than the distance between the two arcs of the side surface of the connecting rod of the push rod 7. The matching design between the push rod 7 and the rear end face through hole of the brake caliper body 1 enables the push rod 7 to move only in the axial direction and not to rotate in the axial direction when working after the push rod 7 penetrates through the rear end face through hole of the brake caliper body 1 and under the limitation of a plane matching surface between the connecting rod of the push rod 7 and the rear end face through hole of the brake caliper body 1, and in addition, the push rod 7 can swing up and down between cambered surface matching surfaces between the connecting rod of the push rod 7 and the rear end face through hole of the brake caliper body 1, so that the push rod 7 and the boosting lever 6 are well matched constantly. Therefore, according to the above-described engagement structure, the push rod base 9 transmits only the linear motion in the axial direction to the push rod 7, but does not transmit the rotational motion in the axial direction, and when the push rod base 9 rotates, spherical friction is formed between the push rod 7 and the push rod base 9.
as shown in fig. 1, 2, 3 and 4, the clamping force retention assembly is located within the housing forward cavity and is mounted to the push rod assembly. The clamping force maintaining assembly is composed of a front clamping ring 8a, a rear clamping ring 8b, a first electromagnet 8c, a second electromagnet 8d, a spring 8e, a front clamping ring retainer 8f and a rear clamping ring retainer 8 g. The front snap ring retainer 8f is of an annular groove structure, the front snap ring retainer 8f is coaxially arranged with the push rod 7, and the front end face of the front snap ring retainer 8f is welded and fixed on the rear end face of the brake caliper body 1; the front snap ring 8a is arranged in an annular groove of the front snap ring retainer 8f, and the front snap ring 8a can rotate relative to the front snap ring retainer 8f along the axial direction; the second electromagnet 8d is of an annular structure, the second electromagnet 8d is arranged coaxially with the push rod 7, and the rear end face of the second electromagnet 8d is fixed on the front end face of the push rod seat 9; the rear snap ring retainer 8g is of an annular groove structure, the rear snap ring retainer 8g is arranged coaxially with the push rod 7, and the rear end face of the rear snap ring retainer 8g is fixed on the front end face of the second electromagnet 8 d; the first electromagnet 8c is arranged in an annular groove of the rear snap ring retainer 8g, and the first electromagnet 8c is connected with the second electromagnet 8d through a spring 8 e; the rear snap ring 8b is also arranged in an annular groove of the rear snap ring holder 8g, and the rear snap ring 8b can axially rotate relative to the rear snap ring holder 8 g; the rear snap ring 8b is located at the front end of the first electromagnet 8c, and when no electromagnetic attraction force acts between the first electromagnet 8c and the second electromagnet 8d, the first electromagnet 8c is pressed on the rear end face of the rear snap ring 8b at the front end under the elastic action of the spring 8 e.
as shown in fig. 7a, 7b and 7c, the front snap ring 8a is of a circular ring structure, a ring of annular snap grooves are formed in the axial middle position of the outer circumferential surface of the front snap ring 8a, and the front snap ring 8a is in snap connection with the inner edge of the annular groove of the front snap ring holder 8f through the annular snap grooves, so that axial fixation is realized; the rear end face of the front snap ring 8a is provided with a circle of wedge-shaped convex blocks, in the embodiment, six wedge-shaped convex blocks are uniformly distributed on the outer end face of the front snap ring 8a along the circumference, and inclined planes of the wedge-shaped convex blocks are sequentially arranged along the circumferential direction.
as shown in fig. 8a, 8b and 8c, the rear snap ring 8b is of a circular ring structure, a ring of annular clamping grooves are formed in the axial middle position of the outer circumferential surface of the rear snap ring 8b, and the rear snap ring 8b is clamped with the inner edge of the annular groove of the rear snap ring holder 8g through the annular clamping grooves to achieve axial fixation; be equipped with round wedge groove on the preceding terminal surface of back snap ring 8b, with preceding wedge lug on the 8a terminal surfaces of snap ring correspondingly, in this embodiment, there are six wedge grooves along the circumference equipartition on the outer terminal surface of back snap ring 8b, the inclined plane of wedge groove sets gradually along the circumferencial direction syntropy, and wedge groove and preceding wedge lug on the 8a terminal surfaces of snap ring match one by one and correspond, when back snap ring 8b contacted with preceding snap ring 8a, the joint was realized matching to corresponding wedge lug of accessible and wedge groove to restrict axial rotary motion each other.
among the above-mentioned clamp force keeps the subassembly, when the wedge lug of current snap ring 8a rear end and the wedge groove phase separation of back snap ring 8b front end, preceding snap ring 8a and back snap ring 8b can be respectively in preceding snap ring holder 8f and back snap ring holder 8g independent motion, when the wedge lug of current snap ring 8a rear end begins to contact with the wedge groove of back snap ring 8b front end, the relative motion of preceding snap ring 8a and back snap ring 8b begins to eliminate gradually, the motion of preceding snap ring 8a and back snap ring 8b is progressively the same, after the wedge lug on current snap ring 8a and the complete cooperation joint of the wedge groove on the back snap ring 8b, preceding snap ring 8a and back snap ring 8b begin synchronous motion.
In the above-mentioned clamping force keeps the assembly, when the first electro-magnet 8c and the second electro-magnet 8d are in the energized state, the first electro-magnet 8c and the second electro-magnet 8d attract each other, the two overcome the spring force of the spring 8e and attract together, the back snap ring 8b is in the free motion state in its holder 8g at this moment; when the first electromagnet 8c and the second electromagnet 8d are in the power-off state, because the electromagnetic attraction force between the first electromagnet 8c and the second electromagnet 8d disappears, the first electromagnet 8c and the second electromagnet 8d are separated under the action of the spring elasticity of the spring 8e, the first electromagnet 8c is pressed against the rear end face of the rear snap ring 8b under the action of the spring 8e, and the rear snap ring 8b synchronously moves along with the push rod seat 9 under the action of friction force.
as shown in fig. 1 and 2, the disc brake is located at the front end of a commercial vehicle electromechanical brake having a clamping force maintaining device according to the present invention, the disc brake is composed of a brake caliper body 1, a brake pad 2 and a brake disc 3, as mentioned above, the rear end surface of the brake caliper body 1 is fixedly connected to a front housing 17 by bolts, the brake caliper body 1 has a front cavity and a rear cavity, the brake disc 3 is located in the front cavity of the brake caliper body 1, the brake pads 2 are located at both sides of the brake disc 3, a piston assembly and a force increasing assembly are both installed in the rear cavity of the brake caliper body 1, the front end of the piston assembly is provided with a brake pad mounting disc 4a, the brake pad 2 at the front side of the brake disc 3 is installed on the brake caliper body 1, and the brake pad 2 at the rear side of the brake disc 3 is installed on the brake pad mounting disc 4a, and the brake pad 2 at the rear, to achieve compression or release of the brake disc 3.
as shown in fig. 1 and 2, the piston assembly is located in the rear cavity of the brake caliper body 1, the piston assembly is composed of a brake pad mounting disc 4a, a piston 4b, a cambered surface groove 4c and a return spring 5, the piston 4b is installed in a corresponding mounting groove in the brake caliper body 1, a spring mounting groove is axially formed in the front end of the piston 4b, the front end surface of the piston 4b is fixedly connected with the brake pad mounting disc 4a, the return spring 5 is installed in the spring mounting groove of the piston 4b, one end of the return spring 5 abuts against the brake caliper body 1, the other end of the return spring 5 abuts against the bottom of the spring mounting groove of the piston 4b, and the cambered surface groove 4c is formed in the rear end surface of the piston 4 b.
as shown in fig. 1, 2, 3 and 4, the power-increasing assembly is located in the rear cavity of the brake caliper body 1, and is composed of a power-increasing lever 6, a bearing roller 21 and a bearing bush 22.
as shown in fig. 6a, 6b and 6c, the rear end of the upper part of the force-increasing lever 6 is provided with an arc groove matched with the arc surface of the front end of the push rod 7, the rear end of the lower part of the force-increasing lever 6 is provided with an arc bulge matched with the brake caliper body 1, and the front end of the lower part of the force-increasing lever 6 is provided with an arc bulge matched with the piston 4 b; an arc surface groove is formed in the inner wall of the brake caliper body 1 corresponding to the arc surface bulge at the lower rear end of the force-increasing lever 6, a bearing bush 22 is installed in the arc surface groove of the brake caliper body 1 in a matching mode, the arc surface bulge at the lower rear end of the force-increasing lever 6 is installed with the bearing bush 22 in a matching mode, bearing rollers 21 are evenly distributed between the arc surface bulge at the lower rear end of the force-increasing lever 6 and the bearing bush 22, and under the supporting and connecting effect of the bearing rollers 21 and the bearing bush 22, the force-increasing lever 6 can swing around the supporting center of the brake caliper body; the cambered surface bulge at the front end of the lower part of the force-increasing lever 6 is always pressed in the cambered surface groove 4c at the rear end of the piston 4b, the contact point of the force-increasing lever 6 and the cambered surface groove 4c is eccentrically arranged with the supporting center of the force-increasing lever 6, and when the force-increasing lever 6 swings under the pushing of the push rod assembly, the piston 4b can linearly move along the axial direction under the driving of the force-increasing lever 6.
In the boosting assembly and the piston assembly, when a braking force is applied, the push rod assembly moves forwards, when the push rod 7 moves forwards and pushes the upper part of the boosting lever 6, the boosting lever 6 swings around the supporting center of the boosting lever, as the contact point of the boosting lever 6 and the cambered surface groove 4c is eccentrically arranged with the supporting center of the boosting lever 6, and the front end of the lower part of the boosting lever 6 is always pressed in the cambered surface groove 4c at the rear end of the piston 4b, the piston 4b can be pushed to move forwards along the axial direction when the boosting lever 6 swings, and under the action of a lever principle, the boosting lever 6 amplifies the axial thrust output by the push rod 7 and transmits the axial thrust to the piston 4b, and the piston 4b drives the brake block 2 to press the brake disc 3 under the thrust action of the boosting lever 6; when the braking force is relieved, the push rod component moves backwards, the force increasing lever 6 moves reversely, the acting force of the force increasing lever 6 on the piston component disappears gradually, the piston 4b retracts to the original position under the action of the restoring force of the restoring spring 5, and the piston component and the force increasing component are restored.
as shown in fig. 1, 2, 3 and 4, the specific operation of the electronic mechanical brake with clamping force maintaining device for commercial vehicle according to the present invention is described as follows:
when the vehicle is braked, a driver steps on a brake pedal, the torque motor 19 rotates forwards, the torque motor 19 drives the ball screw pair nut 13 to rotate through the bevel gear 20 and the bevel gear 12, the ball screw pair screw 10 extends forwards along the axial direction under the rotation driving action of the ball screw pair nut 13, meanwhile, the ball screw pair screw 10 rotates in the ball screw pair nut 13 under the action of the balls 11, the ball screw pair screw 10 drives the push rod seat 9 connected with the ball screw pair screw to extend and rotate axially, in the process, the rotation of the push rod seat 9 cannot be transmitted to the push rod 7 under the matching limitation of the connecting rod of the push rod 7 and the through hole on the rear end face of the caliper body 1, therefore, the push rod seat 9 only drives the push rod 7 to extend axially, the push rod 7 is always contacted with the upper part of the boosting lever 6, the lever 6 swings around the supporting center under the pushing of the push rod 7, because the contact point of the force-increasing lever 6 and the cambered surface groove 4c at the rear part of the piston 4b and the supporting center of the force-increasing lever 6 are eccentrically arranged, and the force-increasing lever 6 always presses the cambered surface groove 4c at the rear part of the piston 4b, when the force-increasing lever 6 swings, the piston 4b is pushed to move forwards along the axial direction, in the process, the force-increasing lever 6 amplifies the axial thrust output by the push rod 7 and transmits the axial thrust to the piston 4b, and the piston 4b drives the brake block 2 to press the brake disc 3 under the action of force, so that braking force is generated;
in addition, when the driving brake is just started, the first electromagnet 8c and the second electromagnet 8d are in an electrified state, the first electromagnet 8c and the second electromagnet 8d attract each other, the front snap ring 8a is positioned in the retainer 8f of the front snap ring and is static, the rear snap ring 8b is positioned in the retainer 8g of the rear snap ring and rotates along with the retainer 8g and the push rod seat 9 synchronously, when the push rod 7 axially extends to a certain length, the front snap ring 8a and the rear snap ring 8b start to contact, driven by the rotation of the rear snap ring 8b, the front snap ring 8a starts to rotate in the retainer 8f thereof, at this time, the rear snap ring 8b starts to slip in the retainer 8g thereof with respect to the rear snap ring retainer 8g, when the wedge-shaped convex block at the rear end of the front snap ring 8a rotates to be completely matched and clamped with the wedge-shaped groove at the front end of the rear snap ring 8b, the relative motion between the front snap ring 8a and the rear snap ring 8b is eliminated, and the front snap ring 8a and the rear snap ring 8b rotate synchronously.
When the service brake is released or reduced, the torque motor 19 rotates reversely, the torque motor 19 drives the ball screw pair nut 13 to rotate reversely, the ball screw pair screw 10 drives the push rod 7 and the push rod seat 9 which are sequentially connected with the ball screw pair nut 13 to move backwards along the axial direction under the driving action of the ball screw pair nut 13, the front snap ring 8a and the rear snap ring 8b are gradually separated under the driving action of the push rod seat 9, meanwhile, under the returning action of the return spring 5, the piston assembly and the force increasing assembly are reset, the brake block 2 is far away from the brake disc 3 under the driving action of the brake block mounting disc 4a and the piston 4b, and the brake force is released or reduced.
when applying parking brake, the vehicle controller detects that a driver sends a parking brake instruction and the driving brake force reaches a specified value, at the moment, the end surfaces of the front clamping ring 8a and the rear clamping ring 8b are completely matched and clamped together, at the moment, the first electromagnet 8c and the second electromagnet 8d are controlled to be in a power-off state, the first electromagnet 8c is pressed on the rear end surface of the rear clamping ring 8b and is pressed tightly under the action of the spring 8e, the wedge-shaped convex block at the rear end of the front clamping ring 8a and the wedge-shaped groove at the front end of the rear clamping ring 8b are clamped and interlocked, and under the friction action of the rear end surfaces of the first electromagnet 8c and the rear clamping ring 8b, the brake clamping force applied on the brake disc 3 sequentially through the push rod assembly, the boosting assembly and the piston assembly is kept.
when the parking brake is released, the vehicle controller detects that a driver sends a command of releasing the parking brake, the first electromagnet 8c and the second electromagnet 8d are controlled to be in a power-on state, the first electromagnet 8c overcomes the spring force of the spring 8e under the action of electromagnetic attraction and rapidly approaches to the second electromagnet 8d, and at the moment, the friction force between the first electromagnet 8c and the rear end face of the rear clamping ring 8b disappears; when a driver loosens the brake pedal, the torque motor 19 rotates reversely, the torque motor 19 drives the ball screw pair nut 13 to rotate reversely, the ball screw pair screw 10 drives the push rod 7 and the push rod seat 9 which are sequentially connected with the ball screw pair nut 13 to move backwards along the axial direction under the driving action of the ball screw pair nut 13, the front snap ring 8a and the rear snap ring 8b firstly start to slide relatively and then are separated gradually under the driving action of the push rod seat 9, at the moment, the wedge-shaped lug at the rear end of the front snap ring 8a and the wedge-shaped groove at the front end of the rear snap ring 8b are clamped and interlocked gradually reduced until completely disappeared, meanwhile, under the returning action of the return spring 5, the piston assembly and the boosting assembly are reset, the brake block 2 is far away from the brake disc 3 under the driving of the brake block mounting disc 4a and the piston 4b, the brake force is relieved or reduced.
The above embodiments are preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and those skilled in the art should understand that they can make modifications, changes, combinations, substitutions and the like without departing from the principle of the present invention.

Claims (8)

1. the utility model provides a commercial car electromechanical brake with clamp force retention function, includes disc brake, casing, torque motor, ball screw pair subassembly, push rod subassembly, reinforcement subassembly and piston assembly and constitutes its characterized in that:
also includes a clamping force maintaining assembly;
The clamping force maintaining assembly consists of a front clamping ring (8a), a rear clamping ring (8b), a first electromagnet (8c), a second electromagnet (8d), a spring (8e), a front clamping ring retainer (8f) and a rear clamping ring retainer (8 g);
The front clamping ring (8a) is installed on the rear end face of a brake caliper body (1) of the disc brake through a front clamping ring retainer (8f), the second electromagnet (8d) is fixed on the front end face of a push rod seat (9) of the push rod assembly, the rear clamping ring (8b) is fixed at the front end of the second electromagnet (8d) through a rear clamping ring retainer (8g), the first electromagnet (8c) is installed at the rear end of the rear clamping ring (8b), and the first electromagnet (8c) is connected with the second electromagnet (8d) through a spring (8 e);
The end face between the front clamping ring (8a) and the rear clamping ring (8b) is provided with a convex block and a clamping groove which are matched, and the rear clamping ring (8b) moves towards the front clamping ring (8a) under the driving of the push rod seat (9) and is fixedly clamped with the front clamping ring (8a) along the circumferential direction to realize interlocking.
2. A commercial vehicle electromechanical brake with clamping force retention as claimed in claim 1, characterized in that:
the front snap ring retainer (8f) is of an annular groove structure, the front snap ring retainer (8f) and the push rod (7) are coaxially arranged, the front snap ring (8a) is installed in the annular groove of the front snap ring retainer (8f), and the front snap ring (8a) can axially rotate relative to the front snap ring retainer (8 f);
the second electromagnet (8d) is of an annular structure, and the second electromagnet (8d) and the push rod (7) are coaxially arranged;
The rear clamping ring retainer (8g) is of an annular groove structure, the rear clamping ring retainer (8g) and the push rod (7) are coaxially arranged, and the rear end face of the rear clamping ring retainer (8g) is fixed on the front end face of the second electromagnet (8 d);
The first electromagnet (8c) is arranged in an annular groove of the rear snap ring retainer (8g), and the first electromagnet (8c) is connected with the second electromagnet (8d) through a spring (8 e);
The rear snap ring (8b) is arranged in an annular groove of the rear snap ring holder (8g), and the rear snap ring (8b) can rotate along the axial direction relative to the rear snap ring holder (8 g);
When no electromagnetic attraction force acts between the first electromagnet (8c) and the second electromagnet (8d), the first electromagnet (8c) is pressed on the rear end face of the rear snap ring (8b) at the front end under the elastic action of the spring (8 e).
3. a commercial vehicle electromechanical brake with clamping force retention as claimed in claim 2, characterized in that:
The front snap ring (8a) is of a circular ring structure, a circle of annular clamping groove is formed in the axial middle position of the outer circumferential surface of the front snap ring (8a), and the front snap ring (8a) is clamped with the inner edge of the annular groove of the front snap ring holder (8f) through the annular clamping groove to realize axial fixation;
a plurality of wedge-shaped lugs are uniformly distributed on the rear end face of the front snap ring (8a), and inclined planes of the wedge-shaped lugs are sequentially arranged in the same direction along the circumferential direction;
The rear snap ring (8b) is of a circular ring structure, a circle of annular clamping groove is formed in the axial middle position of the outer circumferential surface of the rear snap ring (8b), and the rear snap ring (8b) is clamped with the inner edge of the annular groove of the rear snap ring holder (8g) through the annular clamping groove to achieve axial fixation;
A plurality of wedge-shaped grooves are uniformly distributed on the front end face of the rear snap ring (8b), inclined planes of the wedge-shaped grooves are sequentially arranged in the same direction along the circumferential direction, and the wedge-shaped grooves are matched with the wedge-shaped lugs on the end face of the front snap ring (8a) in a one-to-one correspondence manner.
4. A commercial vehicle electromechanical brake with clamping force retention as claimed in claim 1, characterized in that:
The torque motor (19) is arranged on the shell through a motor mounting disc (16), and a driving bevel gear (20) is coaxially arranged on an output shaft of the torque motor (19);
the ball screw pair assembly is composed of a ball screw pair screw (10), balls (11), a ball screw pair nut (13) and a driven bevel gear (12), the ball screw pair nut (13) is sleeved on the outer side of the ball screw pair screw (10) and is in transmission connection with the ball screw pair screw (10) through the balls (11) to form a ball screw pair, the outer side of the circumference of the ball screw pair nut (13) is supported and installed on an annular boss in the shell, the driven bevel gear (12) is coaxially fixedly connected to the outer circumference of the ball screw pair nut (13) and moves synchronously with the ball screw pair nut (13), and the driven bevel gear (12) is in meshing connection with a driving bevel gear (20) at the output end of the torque motor (19).
5. a commercial vehicle electromechanical brake with clamping force retention as claimed in claim 1, characterized in that:
the brake caliper is characterized in that the push rod assembly is composed of a push rod (7) and a push rod seat (9), the rear end of the push rod seat (9) is fixedly connected with the front end face of a ball screw pair screw (10) of the ball screw pair assembly, a spherical groove is formed in the front end face of the push rod seat (9), the front end of the push rod (7) is an arc-shaped face, the front end of the push rod (7) penetrates through a through hole in the rear end face of the brake caliper body (1) to be in contact connection with the arc-shaped groove of a reinforcement lever (6) of the reinforcement assembly, and the rear end of the push rod (7) is a ball end and is in contact connection with the spherical surface of.
6. a commercial vehicle electromechanical brake with clamping force retention as claimed in claim 5, characterized in that:
The connecting rod lateral surface main part of push rod (7) is the face of cylinder, it has two parallel planes to process along the axial on the connecting rod lateral surface of push rod (7), the through-hole shape of brake calliper body (1) rear end face and the connecting rod radial cross-section shape phase-match of push rod (7), and follow laminating mutually in the connecting rod outside plane of push rod (7) and the through-hole of brake calliper body (1), leave the clearance between the through-hole of connecting rod outside cambered surface of push rod (7) and brake calliper body (1) in following, make after push rod (7) passes the through-hole of brake calliper body (1), push rod (7) can be followed axial rectilinear motion and can't be followed axial rotation.
7. a commercial vehicle electromechanical brake with clamping force retention as claimed in claim 1, characterized in that:
piston assembly is by brake block mounting disc (4a), piston (4b), cambered surface groove (4c) and return spring (5) are constituteed, install in the mounting groove in brake calliper body (1) piston (4b), it has spring mounting groove to open along the axial piston (4b) front end, and the preceding terminal surface and the brake block mounting disc (4a) fixed connection of piston (4b), install in the spring mounting groove of piston (4b) return spring (5), the one end top of return spring (5) is leaned on brake calliper body (1), the other end top of return spring (5) is leaned on the spring mounting groove bottom of piston (4b), rear end face at piston (4b) is equipped with cambered surface groove (4 c).
8. A commercial vehicle electromechanical brake with clamping force retention as claimed in claim 7, characterized in that:
the boosting assembly consists of a boosting lever (6), a bearing roller (21) and a bearing bush (22), wherein the rear end of the upper part of the boosting lever (6) is provided with an arc surface groove matched with the arc surface of the front end of a push rod (7) of the push rod assembly, the rear end of the lower part of the boosting lever (6) is provided with an arc surface bulge matched with a brake caliper body (1) of the disc brake, and the front end of the lower part of the boosting lever (6) is provided with an arc surface bulge matched with the piston (4 b);
the bearing bush (22) is arranged in an arc surface groove on the inner wall of the brake caliper body (1), an arc surface bulge at the rear end of the lower part of the boosting lever (6) is matched with the bearing bush (22), the bearing rollers (21) are uniformly distributed between the arc surface bulge at the rear end of the lower part of the boosting lever (6) and the bearing bush (22), and under the supporting and connecting action of the bearing rollers (21) and the bearing bush (22), the boosting lever (6) swings around the supporting center of the brake caliper body (1) relative to the brake caliper body;
the cambered surface bulge at the front end of the lower part of the force-increasing lever (6) is pressed in the cambered surface groove (4c) at the rear end of the piston (4b), the contact point of the force-increasing lever (6) and the cambered surface groove (4c) and the supporting center of the force-increasing lever (6) are eccentrically arranged, and when the force-increasing lever (6) swings under the pushing of the push rod assembly, the piston (4b) linearly moves along the axial direction under the driving of the force-increasing lever (6).
CN201910948045.4A 2019-10-08 2019-10-08 commercial vehicle electronic mechanical brake with clamping force retaining function Pending CN110541897A (en)

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CN112212004A (en) * 2019-07-10 2021-01-12 广州汽车集团股份有限公司 Parking device for vehicle
CN112212004B (en) * 2019-07-10 2022-04-01 广州汽车集团股份有限公司 Parking device for vehicle
CN111249113A (en) * 2020-03-06 2020-06-09 重庆百事得大牛机器人有限公司 Intelligent training method and system for medical training
CN112032225A (en) * 2020-09-24 2020-12-04 吉林大学青岛汽车研究院 Wet-type multi-disc brake with shifting fork force-increasing mechanism and using method thereof
CN112032225B (en) * 2020-09-24 2024-03-22 吉林大学青岛汽车研究院 Wet type multi-disc brake with shifting fork force increasing mechanism and using method thereof
CN114576293A (en) * 2022-03-17 2022-06-03 西北工业大学宁波研究院 Electromagnetic mechanical brake, method and application
CN114576293B (en) * 2022-03-17 2023-06-30 西北工业大学宁波研究院 Electromagnetic mechanical brake, method and application
CN114954405A (en) * 2022-05-13 2022-08-30 燕山大学 Motor redundancy's commercial car EMB drive-by-wire mechanical braking system executor

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