JP5340327B2 - Brake fluid pressure control unit - Google Patents

Description

  The present invention relates to a brake fluid pressure control unit including a brake system control mechanism such as an anti-lock brake device, a vehicle behavior control device, and a traction control device.

  As this type of brake fluid pressure control unit, the one described in Patent Document 1 below has been proposed.

In this brake hydraulic pressure control unit, as shown in FIG. 20, a rectangular parallelepiped base block 1 made of an aluminum material is provided with a hydraulic circuit (not shown) including a hydraulic device such as a pump. On the first base surface 1a and the second base surface 1b, which are two opposite surfaces on the block 1, are mounted a motor 2 for operating the pump and an electronic base block 3 for controlling electromagnetic valves and other devices. Yes. In addition, the base block 1 is provided with a reservoir 8 in which a piston 6 and an urging means 7 are accommodated in a space surrounded by the cylinder hole 4 and the lid member 5, and hydraulic fluid (brake fluid) in the hydraulic circuit is provided. ) Is temporarily stored by the reservoir 8. The cylinder hole 4 of the reservoir 8 is formed in the second base surface 1b to which the electronic board block 3 is attached, and the lid member 5 attached to the opening of the cylinder hole 4 protrudes into the cover of the electronic board block 3. .
International Publication WO99 / 25594

  It is desirable that this type of brake hydraulic pressure control unit is made as compact as possible because it is disposed in a limited space of the vehicle.

However, the conventional brake fluid pressure control unit width w _a of the entire inevitably hydraulic control unit to the reservoir 8 is attached to the same second base surface 1b and the electronic base block 3 is increased, the vehicle mountability It is difficult to improve. That is, if the cylinder hole 4 formed in the base block 1 is deepened, the width of the base block 1 itself must be increased. To avoid this, if the protruding height of the lid member 5 is increased, the inside of the electronic base block 3 is increased. The height of the base block 3 must be increased in order to avoid interference with other base parts.

  Therefore, the invention of this application reduces the width of the base block on the side where the motor and the electronic base block are arranged, and allows the reservoir to be arranged in the block while keeping the whole base block compact, so that it is mounted on the vehicle. The present invention is intended to provide a brake fluid pressure control unit with excellent performance.

According to a first aspect of the present invention, there is provided a motor attached to a first base surface side of a base block and an electron attached to a second base surface side positioned in a direction opposite to the first base surface of the base block. A substrate block; a cylinder hole formed in a surface between the first base surface and the second base surface of the base block; a piston slidably provided in the cylinder hole; a reservoir comprising a lid member for closing the biasing means and the opening of the cylinder bore which provides a brake fluid pressure control unit provided a
The lid member is formed in a bottomed cylindrical shape, and includes a cylindrical wall and a flange continuously formed in an annular shape from the end of the cylindrical wall to the outer peripheral side ,
The flange has a flange outer peripheral edge projecting outward from the diameter of the cylinder hole,
While forming an annular concave step on the entire opening edge of the cylinder hole,
With placing the outer circumferential edge of the flange on the bottom of the concave stepped portion, a pair of arcuate engaging said flange outer periphery for engaging the upper edge of the concave stepped portion so as to partially expose caulked Forming a stop,
The chord connecting both ends of the arc portion formed by the partially exposed flange outer peripheral edge portion is configured to be along the first base surface and the second base surface .

  According to this invention, since the locking portion is formed by partially caulking the upper edge of the annular concave step portion of the cylinder hole, it is not necessary to form a caulking allowance around the entire circumference of the opening of the cylinder hole. The width of the base block can be reduced as compared with the conventional case in which the entire circumference of the opening is caulked, thereby further reducing the size of the hydraulic unit.

  In addition, since the load required for caulking can be reduced compared to caulking the entire circumference of the opening of the cylinder hole, the tip can be positioned without taking measures such as reducing the caulking load using a tapered punch. Caulking with a flat punch becomes possible.

  In addition, the present invention performs partial caulking on the upper edge of the annular concave stepped portion, so that the axial center (reference center) of the concave stepped portion and the arc shape of the locking portion formed by the caulking are provided. It is possible to determine a caulking failure by obtaining a caulking axis deviation amount based on the caulking center and comparing the deviation amount with a reference value.

  Next, each embodiment of the invention of this application will be described with reference to the drawings.

  First, the first embodiment will be described with reference to FIGS. This embodiment is an example of an anti-lock brake device that is one of in-vehicle devices that controls a brake system, and a brake fluid pressure control unit (hereinafter referred to as a “fluid pressure control unit”) is a hydraulic fluid feed. A rectangular parallelepiped base block 11 on which a hydraulic circuit including various hydraulic devices such as a supply pump 10 is mounted, and a first base surface 11a and a second base surface which are two surfaces facing in opposite directions on the base block 11. A pump drive motor 12 and an electronic base block 13 for electronic device control, which are respectively attached to the base surface 11b, are provided.

  A pipe (not shown) on the master cylinder side and a pipe (not shown) on the wheel cylinder side are respectively connected to the base block 11, and the hydraulic pressure on the wheel cylinder side is appropriately controlled by a hydraulic circuit in the block 11. It is supposed to be. Specifically, the hydraulic pressure control unit appropriately opens and closes a passage in the hydraulic circuit by an electromagnetic valve 14 provided across the base block 11 and the electronic base block 13, and in the wheel cylinder according to the slip state of the wheel. The pressure is reduced, held, or increased again. In addition, a pair of reservoirs 15 for temporarily storing hydraulic fluid is provided in the hydraulic circuit of the base block 11, and the hydraulic fluid in each reservoir 15 is appropriately returned to the master cylinder side by the operation of the hydraulic pump 10. It is supposed to be. In the case of this embodiment, the pump 10 is constituted by a plunger pump as shown in FIG. 2, and an eccentric cam 16 that is rotationally driven by a motor 12 reciprocates a plurality of plungers 17, thereby performing pump operation. It has become.

  The base block 11 is entirely formed of an aluminum material, and is designed so that the upper surface side in FIG. A pair of cylinder holes 18 and 18 are formed on the lower surface of the base block 11 in a direction perpendicular to the width direction between the first and second base surfaces 11a and 11b. 1-3, a piston 19 that slides in the cylinder hole 18 and a coil spring 20 that is a biasing means that biases the piston 19 toward the bottom of the cylinder hole 18 are accommodated. At the same time, a lid member 21 made of the same aluminum material as that of the base block 11 is attached to the open end of each cylinder hole 18.

  The piston 19 in each cylinder hole 18 is provided with a seal ring 22 on the outer periphery, and the space between the cylinder hole 18 and the lid member 21 is divided into a liquid chamber 23 and an atmospheric chamber 24. The liquid chamber 23 located on the bottom side of the cylinder hole 18 is connected to a passage outside the figure in the hydraulic circuit, and the air chamber 24 communicates with the outside of the unit through a vent hole 25 formed in the bottom surface of the lid member 21. doing.

  A concave step 26 is formed in an annular shape at the opening edge of the cylinder hole 18 as shown in an enlarged view in FIG. 3, and a lid member 21 is pressed and fixed to the bottom surface of the concave step 26 by a fixing means described later. Yes. The entire lid member 21 is formed in a bottomed cylindrical shape, and an outward flange 28 extends in an annular shape at the end of the cylindrical wall 27, and the cylindrical wall 27 is fixed to the concave stepped portion 26. It protrudes from the lower surface of the base block 11.

  The outer diameter of the flange 28 is slightly smaller than the inner diameter of the concave step portion 26, and a tapered surface 28a (see FIG. 3) is formed on the upper surface side (cylindrical wall 27 side) so as to be thin toward the outer peripheral tip. ) Is formed. Further, the outer peripheral edge portion of the flange 28 protrudes outward from the diameter of the cylinder hole 18 and is in contact with the bottom surface of the concave step portion 26, but the inner peripheral edge portion of the flange 28 has a diameter larger than the inner peripheral surface of the cylinder hole 18. A cylindrical wall 27 located on the inner side in the direction and connected to the flange 28 is formed to have a diameter smaller than the diameter of the cylinder hole 18. Therefore, the inner peripheral edge of the flange 28 faces the end surface of the piston 19 and abuts against the piston 19 when the piston 19 descends more than the set stroke, thereby restricting excessive displacement of the piston 19.

By the way, the flange 28 of the lid member 21 is fixed by a pair of locking portions 29 (plastic deformation portions) extending on the upper edge of the concave step portion 26 as shown in FIGS. As will be described in detail later, the locking portion 29 is formed by partially caulking the upper edge of the concave step portion 26, and the entire shape is formed in an arc shape as shown in FIG. 4 in plan view. . Moreover, both the latching | locking parts 29 are modeled in the area | region except the vicinity of the 1st, 2nd base surfaces 11a and 11b among the peripheral parts of the concave step part 26, and the edge of the circumferential direction of these each latching | locking part 29 The part is formed so as to be parallel to the first and second base surfaces 11a and 11b as shown in FIGS. Therefore, the circumferential edge of each locking portion 29 has a larger arc angle α _{2 in the} radially inner region of the locking portion 29 than the arc angle α ₁ of the maximum outer diameter portion of the locking portion 29. It has become. Further, each locking portion 29 has a virtual circle diameter R ₁ formed by an arc of the maximum outer diameter portion of the locking portion 29 having a width w between the first and second base surfaces 11a and 11b (hereinafter referred to as “base block 11”). Is set to be larger than the width w.

  In addition, plug connection ports 30a and 30b are provided in the vicinity of the upper surface of the base block 11 and the upper end portion of the first base surface 11a, and pipe connection plugs (not shown) are attached to these connection ports 30a and 30b. In FIG. 5, reference numeral 31 denotes an insulator rubber which is disposed at a substantially intermediate position between the reservoirs 15 and 15 on the bottom surface of the base block 11 and performs a vibration isolating function when the base block 11 is mounted in the engine room of the vehicle. is there.

  A punch 32 as shown in FIGS. 6 and 7 is used for caulking the upper edge of the concave step portion 26. The punch 32 has a pair of arcuate pressure projections 33, 33 at the tip, and a circular relief hole 34 for allowing the cylindrical wall 27 of the lid member 21 to escape when caulking inside the pressure projections 33. Is formed. The pressurizing protrusion 33 is formed with a substantially constant width as a whole, but the circumferential edges of the pressurizing protrusion 33 are the same as the first and second base surfaces 11a and 11b of the base block 11 in the same manner as the locking portion 29. They are formed in parallel. Since the pressure protrusion 33 caulks the upper edge of the concave step portion 26 of the base block 11, the radius of curvature of the arc surface on the outer periphery of the pressure protrusion 33 is the curvature of the inner peripheral surface of the concave step portion 26. It is set larger than the radius.

  When caulking using the punch 32, first, as shown in FIG. 8, the lid member 21 is placed on the bottom surface of the concave step portion 26 of the base block 11, and in this state, the upper edge of the concave step portion 26 is placed. The two pressing protrusions 33, 33 of the punch 32 are simultaneously pressed to a predetermined position. When the pressing by the punch 32 is performed in this way, the upper edge of the concave step portion 26 is plastically deformed along the end face shape of the pressing protrusion 33, and the locking portion 29 presses the tapered surface 28a of the flange 28 as shown in FIG. In this way, it will be shaped.

  By performing partial caulking on the upper edge of the concave step portion 26 by such a method, defective products having a large caulking error can be easily selected using image processing or the like. This will be described below.

  First, the caulking error will be described. The caulking error usually occurs when the position of the pressing protrusion 32 of the punch 32 is greatly deviated from the specified position as shown by the chain line in FIG. When caulking is performed in a shifted state, as shown by the chain line in FIG. 9, the amount of material extruded due to plastic deformation is insufficient, and sufficient presser strength against the flange 28 of the lid member 21 cannot be obtained. Accordingly, it is necessary to sort out such a product with insufficient presser strength as a defective product, but a product subjected to partial caulking by the above-described method can determine a defect as follows.

That is, when partial caulking is performed by the above method, the inner peripheral surface of the concave step portion 26 always remains partially after caulking, so that the reference from the arc of the remaining concave step portion 26 as shown in FIG. The center (x ₀ , y ₀ ) can be obtained by image processing or the like. On the other hand, for the caulking actually performed, as shown in FIG. 11, the caulking center (x ₁ , y ₁ ) can be similarly obtained by image processing or the like from the arc shape of the locking portion 29 that is the caulking trace. . Accordingly, a calculation is performed on the basis of these coordinates (x ₀ , y ₀ ) and (x ₁ , y ₁ ) to obtain a displacement amount δ of the caulking axis, and by comparing this displacement amount δ with a reference value, a defective product Can be determined.

12 and 13 are a plan view and a cross-sectional view when the entire periphery is caulked by a punch 132 having an annular pressure protrusion 133 against the upper edge of the concave step portion 26. FIG. In this case, since the entire upper edge of the concave step portion 26 is crushed by caulking to form an annular locking portion 129, the circumference of the concave step portion 26 is obtained in order to obtain the reference center (x ₀ , y ₀ ). A circular recess 35 for marking must be separately provided in the area. Therefore, as compared with the case where partial caulking is performed by the above-described method, another process for forming the mark circular recess 35 must be added.

  In the hydraulic pressure control unit configured as described above, the cylinder hole 18 and the lid member 21 of the reservoir 15 are basically disposed on the lower surface of the base block 11, and the cylindrical wall 27 of the lid member 21 is disposed from the lower surface thereof. By projecting to the outside of the block, there is an effect that the width w of the base block 11 can be surely reduced without increasing the height of the base block 11 in the vertical direction. That is, since the cylinder hole 18 and the lid member 21 are arranged on the lower surface of the base block 11, the large axial length of the reservoir 15 does not occupy the width direction of the base block 11, and the lid member does not slide the piston 19 inside. By projecting the cylindrical wall 27 of 21 to the outside of the base block 11, the depth L of the cylinder hole 18 (see FIG. 3) is minimized, so that the amount of protrusion on the lower surface side of the base block 11 itself can be reduced. it can.

  Further, the reservoir 15 is provided on a surface other than the first and second base surfaces 11a and 11b of the block 11 instead of being provided on the lower surface of the base block 11, so that the width w of the base block 11 can be reduced. The same effect can be obtained, but when it is provided on the lower surface side of the base block 11 as in this embodiment, the projected area of the entire unit when viewed from above is reduced, and this unit is Mountability when installed in the engine room of the vehicle is further improved. Furthermore, when it arrange | positions on the surface on the opposite side to the side where a pipe connection plug is arrange | positioned among the upper and lower surfaces of the base block 11 like this embodiment, the cover member 21 protruded from the base block 11 However, there will be no inconvenience when connecting pipes.

  Further, in this embodiment, since the lid member 21 protrudes from the lower surface of the base block 11 together with the insulator rubber 31 for mounting the vehicle body, the space which is originally a dead space on the lower surface side of the base block 11 can be effectively utilized. Therefore, the substantial occupied volume of the hydraulic pressure control unit when mounted on the vehicle can be further reduced.

  In addition, since the hydraulic pressure control unit fixes the lid member 21 to the opening edge of the cylinder hole 18 by partial caulking, it is compared with the case where the lid member 21 is fixed using another member such as a C ring. Thus, the fixing work itself is facilitated and the structure of the mounting portion is simplified, so that the manufacturing cost can be reduced and the size can be further reduced. Further, compared to the case where the entire circumference of the cylinder hole 18 is caulked in a ring shape, the load required for caulking can be reduced. Therefore, even if the pressing surface of the punch 32 is flattened, it can be caulked relatively easily. it can. Therefore, the punch shape can be simplified to reduce the tool cost, and the punch life can be extended.

  Furthermore, the hydraulic pressure control unit of this embodiment performs partial caulking only at positions excluding the vicinity of the first and second base surfaces 11a and 11b when the lid member 21 is fixed to the opening edge of the cylinder hole 18. Therefore, as shown in the image of the chain line in FIG. 5, the distortion of both the base surfaces 11a and 11b due to the caulking can be suppressed to be small. Therefore, the width of the base block 11 can be further reduced from this.

In the hydraulic pressure control unit, the virtual circle diameter R ₁ formed by the arc of the maximum outer diameter portion of the locking portion 29 of the locking portion 29 formed by caulking is larger than the width w of the base block 11. Therefore, it is possible to secure a sufficient caulking allowance and increase the caulking strength with respect to the lid member 21 while the width w of the base block 11 is narrowed.

Furthermore, in the case of this embodiment, the circumferential edge of each locking portion 29 is not formed along the radial direction, but is the same as the arc angle α ₁ of the maximum outer diameter portion of the locking portion 29. since the arc angle alpha ₂ of the radially inner region of the locking portion 29 is formed so as greatly to ensure larger pressing area by caulking, it can be made more reliably fixed relative to the cover member 21. In particular, as shown in FIG. 4, when the end edge of the locking portion 29 is shaped so as to be parallel to the first and second base surfaces 11a and 11b, the first and second base surfaces 11a and 11b It is possible to secure the maximum pressing area by the locking portion 29 with respect to the lid member 21 while suppressing the caulking distortion that appears.

  In the above description, the embodiment has been described in which the edges of the pair of locking portions 29, 29 formed by caulking are formed so as to be parallel to the first and second base surfaces 11a, 11b. As shown in the second embodiment, the end edges of the pair of locking portions 29, 29 are formed so as to form a straight line substantially along the tangential direction of the cylinder hole 18, and the straight lines formed by the both end edges are the first. The second base surfaces 11a and 11b may be inclined by a set angle θ. In the case of this embodiment, the width w of the base block 11 is not as advantageous as that of the first embodiment, but the width w is smaller than the case where the entire circumference of the opening edge of the cylinder hole 18 is caulked. It can be narrower.

  FIG. 15 shows a third embodiment of the invention of this application. In this embodiment, as in the second embodiment shown in FIG. 14, the edges of a pair of locking portions 29, 29 that form a straight line are inclined with respect to the first and second base surfaces 11a, 11b. However, the two reservoirs 15 and 15 are arranged side by side on one surface on the base block 11, and the end edges of the locking portions 29 of the two reservoirs 15 forming a straight line are not caulked portions (the locking portions 29. (Regions where no is formed) are inclined at a set angle θ on the sides facing each other. Therefore, this embodiment can basically obtain the same effect as that of the second embodiment, but in addition, two straight lines formed by the edges of the locking portions 29 of the two reservoirs 15 and the second base. Since a relatively large triangular area surrounded by the surface 11b (or the first base surface 11a) is secured on the reservoir mounting surface of the base block 11, a large separate component such as the insulator rubber 31 is relatively disposed in this area. It can be easily installed.

  Furthermore, the description has been given above of the case where the pair of locking portions 29, 29 are arranged on the opening edge (concave step portion 26) of the cylinder hole 18. However, as in the fourth embodiment shown in FIG. The illustrated locking portion 29 may be further divided (29a, 29b) in the circumferential direction. Thus, when the latching | locking part 29 is divided | segmented (when the number of latching | locking parts is increased), since plastic deformation itself becomes easy, it becomes possible to make a caulking load smaller. Of course, the end edges of the respective locking portions 29 may be shaped so as to be along the radial direction of the cylinder hole 18 as in the fifth embodiment shown in FIG.

  FIGS. 18 and 19 show the sixth embodiment and the seventh embodiment of the invention of this application. In these embodiments, the basic configuration of the reservoir 15 is the same as that of the first embodiment, but the shape of the lid member 21 is different from that of the first embodiment. In addition, the same code | symbol is attached | subjected to the same part as 1st Embodiment, and the overlapping description shall be abbreviate | omitted.

  The lid member 21 of the embodiment of FIG. 18 is the same as that of the first embodiment up to the point that the flange 28 is provided with a tapered surface 28 a, but an annular groove 40 is further provided on the outer periphery of the distal end portion of the flange 28. It differs in that it is formed. In the case of this embodiment, when the upper edge of the concave step portion 26 is caulked, the material in the vicinity of the upper edge is pushed onto the tapered surface 28a and simultaneously pushed into the annular groove 40. Therefore, in this embodiment, the fixing of the lid member 21 by caulking becomes stronger. At this time, the caulking is preferably partial caulking.

  The lid member 21 of the embodiment of FIG. 19 is not provided with a flange, and an annular groove 40 is formed directly on the outer periphery of the end portion of the cylindrical wall 27. In this embodiment, when the upper edge of the concave step portion 26 is caulked, the material near the upper edge is pushed into the annular groove 40, and the lid member 21 is thereby fixed to the opening of the cylinder hole 18. The In this embodiment, since the flange is not formed on the lid member 21, the shape of the lid member 21 can be simplified and the cost can be further reduced. In this case, the material pushed into the annular groove 40 at the time of caulking becomes the locking portion 29, but it is desirable that the caulking is also partial caulking.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows 1st Embodiment of invention of this application. Sectional drawing corresponding to the AA cross section of FIG. 1 which shows the same embodiment. The expanded sectional view of the reservoir | reserver part of FIG. 2 which shows the same embodiment. The B arrow directional view of FIG. 3 which shows the same embodiment. The rear view of the base block which shows the same embodiment. The perspective view of the crimping punch which shows the embodiment. Sectional drawing corresponding to CC cross section of FIG. 6 of the punch. The expanded sectional view of the state before caulking which shows the same embodiment. The expanded sectional view of the state after caulking which shows the embodiment. The schematic diagram which shows the same embodiment and shows the caulking error discrimination method. The schematic diagram which shows the same caulking error discrimination | determination method. The figure which combined and drawn sectional drawing corresponding to the front view which shows the comparative example with the embodiment. Sectional drawing which shows the comparative example. The rear view of the base block which shows 2nd Embodiment of invention of this application. The rear view of the base block which shows 3rd Embodiment of invention of this application. The rear view of the base block which shows 4th Embodiment of invention of this application. The rear view of the base block which shows 5th Embodiment of invention of this application. The longitudinal cross-sectional view of the reservoir | reserver part which shows 6th Embodiment of invention of this application. The longitudinal cross-sectional view of the reservoir | reserver part which shows 7th Embodiment of invention of this application. The side view of the hydraulic-pressure control unit which shows the prior art.

DESCRIPTION OF SYMBOLS 10 ... Pump 11 ... Base block 11a ... 1st base surface 11b ... 2nd base surface 12 ... Motor 13 ... Electronic base block 14 ... Electromagnetic valve 15 ... Reservoir 18 ... Cylinder hole 21 ... Cover member 26 ... Concave step 27 ... Cylindrical Wall 29 ... Locking portion 32 ... Punch 33 ... Pressure protrusion α ₁ ... Arc angle α ₂ of maximum outer diameter portion ... Arc angle w of radially inner region ... Width R ₁ ... Virtual circle diameter

Claims (3)

A motor attached to the first base surface side of the base block;
An electronic board block attached to the second base surface side located in the opposite direction of the first base surface of the base block;
A cylinder hole formed in a surface between the first base surface and the second base surface of the base block, a piston slidably provided in the cylinder hole, and an urging means for urging the piston And a reservoir comprising a lid member that closes the opening of the cylinder hole ;
A brake fluid pressure control unit provided with
The lid member is formed in a bottomed cylindrical shape, and includes a cylindrical wall and a flange continuously formed in an annular shape from the end of the cylindrical wall to the outer peripheral side ,
The flange has a flange outer peripheral edge projecting outward from the diameter of the cylinder hole,
While forming an annular concave step on the entire opening edge of the cylinder hole,
With placing the outer circumferential edge of the flange on the bottom of the concave stepped portion, a pair of arcuate engaging said flange outer periphery for engaging the upper edge of the concave stepped portion so as to partially expose caulked Forming a stop,
A brake fluid pressure control unit characterized in that a string connecting both ends of an arc portion formed by the partially exposed flange outer peripheral edge is formed along the first base surface and the second base surface . 2. The brake hydraulic pressure control unit according to claim 1, wherein the arc portions formed by the exposed flange outer peripheral edge portions are formed in line-symmetric positions with respect to each other about the axis of the lid member. 2. The base block according to claim 1, wherein a width between the first base surface and the second base surface is shorter than a length in a direction along the first base surface and the second base surface. The brake fluid pressure control unit according to 2.

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