KR20080053723A - Disc brake for vehicle - Google Patents

Abstract

A disk brake of a vehicle is provided to maintain uniform interval between a disk and a frictional pad even though the disk and the pad are worn away. A disk brake of a vehicle comprises as follows. A caliper housing(30) is slidable. Frictional pads(20a,20b) contacted to a disk(10) generates friction. A wedge member(60) is equipped with projections that are bilaterally symmetrical at a predetermined angle. A support member(70) supports the wedge member. A drive member(90) pushes the wedge member to allow the frictional pad to be contacted to the disk. In addition, a first drive motor(50) is connected to the drive member and controls movement of the drive member.

Description

Car Disc Brake {DISC BRAKE FOR VEHICLE}

1 is an exploded perspective view of a conventional vehicle disc brake.

2 is a schematic view showing a brake release state of a conventional vehicle disc brake.

Figure 3 is a schematic view showing a brake release state according to the wear of the friction pad and the disk in a conventional vehicle disk brake.

4 is an exploded perspective view of a vehicular disk brake according to the present invention.

5 is a schematic view showing a braking state of a vehicular disk brake according to the present invention.

6 is a schematic view showing a brake release state in which a wear amount of a friction pad and a disc is compensated for in a vehicle disc brake according to the present invention.

Explanation of symbols on the main parts of the drawings

10: disc 20a, 20b: friction pad

30: Caliper Housing 31: Guide Rod

32: finger portion 33: receiving portion

34: ring member accommodation portion 35: locking jaw

36: second drive motor accommodation portion 37: opening

40: carrier 41: guide hole

50: first drive motor 51: through hole

60: wedge member 61: inclined

62: rear center part 70: support member

71: receiving groove 72: cylindrical portion

73: through hole 80: first reduction gear

90: movable member 91: screw groove

100: second drive motor 110: ring member

120: bearing member 130: second reduction gear

140: cover

The present invention relates to a disc brake for a vehicle, and more particularly, to a disc brake for a vehicle having a wedge member which is driven by an electric motor and moved in the rotational direction of the disc and presses the friction pad against the disc without using hydraulic pressure.

Compared with the conventional hydraulic disc brake which presses and brakes the piston vertically disposed on the friction pad, the vehicle disc brake having the wedge member has a self-energizing effect caused by the wedge member being pulled in the disc rotation direction. There is an advantage of forming a sufficient braking force with only a small force.

The disc brake for a vehicle having such a wedge member is slidable caliper housing 30 as shown in FIGS. 1 and 2, and a carrier 40 fixedly installed at a knuckle portion (not shown) of the vehicle to guide sliding of the caliper housing. ), Friction pads 20a and 20b which are in contact with the disk 10 rotating together with the wheels of the vehicle (not shown) to generate frictional force, and friction pads 20a and 20b are fastened to the front surface of the disk. A wedge member 60 having a wedge-shaped projection having a predetermined inclination angle with respect to the rotational direction is provided symmetrically, and an inclined surface corresponding to the wedge shape of the wedge member is provided to guide and support the disc rotation direction movement of the wedge member. An additional support member 70, a movable member 90 disposed between the wedge member and the support member and pushing the wedge member to bring the friction pad into contact with the disc, and the movable member connected to the movable member. A is configured to include the drive motor 50 to adjust the back and forth movement.

When the driver presses a brake pedal (not shown), the driver senses this and operates the driving motor 50 by an electronic control unit (ECU) (not shown) to move the movable member 90 to the friction pads 20a and 20b. ) And the disk 10 decelerate or stop the vehicle by the frictional force generated by contact with each other, and when the driver releases the brake pedal, the driving motor 50 is rotated in reverse to return the movable member 90 to the initial position. The friction pads 20a and 20b are pushed back by the impact with the disk 10.

By the way, such a conventional disk brake for a vehicle, even if the friction material (20a, 20b) and the disk 10 wear due to the friction between the disk 10 and the friction pad (20a, 20b), the movable member 90 is always initial Since the return to the position, as shown in FIG. 3, the braking time is delayed by increasing the moving distance of the movable member 90 to compensate for the wear amount 'L'.

The present invention is to solve the above-mentioned problems of the prior art, an object of the present invention is to provide a disc brake for a vehicle that can always maintain a constant distance between the disk and the friction pad even if the disk and friction material wears. .

In addition, an object of the present invention is not to provide a separate parking brake and to park the vehicle safely.

In order to achieve the above object, the present invention provides a slidable caliper housing, a friction pad contacting the disk to generate a friction force, a friction pad fastened to the front surface, and a wedge having a predetermined inclination angle with respect to the rotation direction of the disk. The wedge member is provided with a lateral symmetrical shape, and the inclined surface corresponding to the wedge shape of the wedge member is provided to support the wedge member, and is disposed between the wedge member and the support member so that the friction pad contacts the disc. In the disc brake for a vehicle including a movable member for pushing the wedge member and a first driving motor connected to the movable member to control the retraction movement of the movable member, the support member includes a cylindrical portion protruding on the other side of the inclined surface, the cylindrical outer peripheral surface A male thread is formed in the inner side, and a through hole is formed in the inner side to accommodate the first driving motor. A female screw is formed on the inner circumferential surface and a gear train is formed on the outer circumferential surface to engage the male screw formed in the cylindrical portion of the supporting member, and a rotatable ring member to control the forward and backward movement of the supporting member; It characterized in that it further comprises a second drive motor to adjust.

In addition, the caliper housing is provided with a receiving portion for receiving the cylindrical portion of the ring member and the support member, the engaging jaw limiting the forward and backward movement of the ring member is formed on both front and rear sides of the ring member, between the ring member and the locking jaw The bearing member for supporting the rotational movement of the is characterized in that it is inserted.

In addition, the first reduction gear disposed between the movable member and the first drive motor to reduce the rotational speed of the first drive motor, and disposed between the ring member and the second drive motor to reduce the rotational speed of the second drive motor. It further comprises a second reduction gear.

In addition, the first reduction gear is composed of a planetary gear, the second reduction gear is characterized in that it is composed of a spur gear.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

In the disc brake for a vehicle according to the present invention, as shown in FIGS. 4 and 5, friction pads 20a and 20b are brought into contact with both side surfaces of a disc-shaped disc 10 that rotates together with a wheel (not shown) of the vehicle, respectively. A device for braking using generated frictional force, which is fixed to a caliper housing 30 having a pair of friction pads 20a and 20b disposed opposite to each other and a knuckle portion of a vehicle (not shown). The caliper housing 30 includes a carrier 40 for guiding sliding.

In order to allow the caliper housing 30 to be installed in the carrier 40 so as to be moved forward and backward, a pair of guide rods 31 are fixed to both sides of the caliper housing 30 through fastening members such as screws. The guide holes 41 are provided at both sides of the carrier 40 so that the guide rod 31 can move forward and backward. In addition, the rear of the caliper housing 30, the cylindrical portion 72, the ring member 110, the bearing member 120, the second driving motor 100 and the second reduction gear 130 of the support member 70 to be described later ) Is formed integrally with the caliper housing (30).

 The accommodating part 33 has a ring member accommodating part 34 having an inner diameter larger than the outer diameter of the ring member 110 to be described later, and protrudes in the center direction from both sides before and after the ring member accommodating part 34 to support the member 70. It has a locking jaw 35 having an inner diameter larger than the cylindrical portion 72, the second drive motor receiving portion 36 so that the second drive motor 100 can be installed on one side of the ring member receiving portion 34 And an opening 37 so that the ring member accommodating portion 34 and the second driving motor accommodating portion 36 communicate with each other.

The inner side of the caliper housing 30 is provided with a friction pad (20a) on the front and the wedge member (60) to make the friction pad (20a) in contact with the disk 10 as the movable member 90 to be described later advances And, the support member 70 is formed so that the front side is inclined to correspond to the rear surface of the wedge member 60 to support the rear surface of the wedge member 60, the other friction pad (inside the other side of the caliper housing 30) The finger part 32 to which 20b) is provided is provided. In the present embodiment, the friction pad 20a, which is installed on the wedge member 60 among the two friction pads 20a and 20b and moves together with the wedge member 60, is referred to as the inner friction pad 20a, and the finger portion 32 The friction pad 20b provided in the) is called the outer friction pad 20b.

The front surface of the wedge member 60 is formed in parallel with the rotation surface of the disk 10 so that the inner friction pad 20a can be in uniform contact with one side of the disk 10, the back surface of the wedge member 60 The inclined surface 61 protruding inclined at a predetermined angle with respect to the rotational direction of the disk 10 is provided symmetrically, and the rear center portion 62 is parallel to the rotational surface of the disk 10 so as to be connected to the inclined surface 61. Formed.

The movable member 90 is disposed to contact the rear center portion 62 of the wedge member 60, and therein, in order to convert the rotational movement of the first driving motor 50, which will be described later, into a linear movement of the movable member 90. The screw groove 91 is formed. Movable member 90 is preferably formed in a rectangular cross-section so that rotation is limited by the rectangular receiving groove 71 formed in the support member 70 to be described later.

In addition, the support member 70 is formed to be inclined so as to correspond to the inclined surface 61 of the wedge member 60 so as to support the back surface of the wedge member 60, the movable member 90 in the front center portion A rectangular accommodating groove 71 recessed to the rear side is formed to be accommodated. A cylindrical portion 72 protrudes from the rear surface of the supporting member 70, and an outer circumferential surface of the cylindrical portion 72 is formed with a male screw, and the first driving motor 50 to be described later is accommodated therein. The through hole 73 is formed.

 The first driving motor 50 is accommodated in the through-hole 73 formed in the cylindrical portion 72 of the support member 70, the first reduction gear 80 is supplied with power by an electronic control unit (not shown). It is decelerated by the to control the movement of the movable member 90.

On the other hand, the ring member 110 has a female thread formed on the inner circumferential surface so as to be screwed to the outer side of the cylindrical portion 72 of the support member 70, the gear train is formed on the outer circumferential surface, the ring formed in the caliper housing 30 It is attached to the member accommodation part 34.

Bearing member for supporting the rotational movement of the ring member 110 and limiting the translational movement of the ring member 100 between the ring member 110 and the locking jaw 35 of the receiving portion 33 formed in the caliper housing 30 120 is inserted.

The second driving motor 100 for adjusting the rotational movement of the ring member 100 is disposed in the second driving motor accommodating part 36 formed in the caliper housing 30 in parallel with the first driving motor 50. The second reduction gear 130 is installed in the opening 37 communicating between the two-drive motor accommodating part 36 and the ring member accommodating part 34 so that the rotational force of the second driving motor 100 is ring member 110. Decelerate to and deliver. In the present invention, the second reduction gear 130 is preferably made of a spur gear.

Reference numeral "140" is formed in the same shape as the inner shape of the receiving portion 33 formed in the caliper housing 30 to cover the cylindrical portion 72 and the ring member 110, etc. of the support member 70, 140 )to be.

Hereinafter, the operation of the vehicular disk brake according to the present invention will be described.

When the driver presses the brake pedal (not shown), the electronic control unit (not shown) recognizes the brake operation switch (not shown), and when the driver applies power to the first driving motor 50, the first driving motor 50 is applied. ) Will rotate. Typically, when power is applied to the motor, the motor rotates at a high speed, so a means for reducing the speed is required. In the present invention, by using the first reduction gear 80 composed of a planetary gear to reduce the rotational speed of the first drive motor 50 to the movable member 90, the movable member 90 is the support member 70 Since the rotation is limited by the rectangular receiving groove 71 formed in the wedge member 60 is moved forward. As the movable member 90 moves forward, the wedge member 60 is pushed so that the inner friction pad 20a coupled with the wedge member 60 presses the disk 10, and the reaction force caused by the pressing force acts on the caliper housing. 30 is retracted along the guide hole 41 of the carrier 40 so that the finger portion 32 of the caliper housing 30 pulls the outer friction pad 20b toward the disk 10 so that the friction pad 20a, Braking is performed by the friction between 20b) and the disk 10. When the driver releases the brake pedal, the first driving motor 50 is rotated in reverse to return the movable member 90 to the initial position and the friction pad 20a. 20b is pushed back by the impact with the disk 10, and braking is terminated.

The time required from the moment the driver operates the brake pedal to the start of the braking of the vehicle is controlled by the brake control switch mounted on the brake pedal and the wheel speed sensor that senses the rotational speed of the wheel of the vehicle. Is calculated by. If it is determined that the required time is longer than the initial set time, the electronic control unit applies power to drive the second driving motor 100. As the second driving motor 100 is rotated, the ring member 110 is fixed to the ring member accommodating portion 34 of the caliper housing 30 through the second reduction gear 130, thereby rotating the ring member 110. Cylindrical portion 72 of the support member 70 is screwed with the female screw portion provided on the inner peripheral surface of the) is advanced.

As shown in FIG. 6, when the cylindrical portion 72 of the support member 70 moves forward, the wedge member 60 and the inner friction pad 20a are moved forward toward the disk 10, so that the friction pad according to the abrasion is worn. The gap between the 20a and 20b and the disk 10 can be compensated for.

In addition, even when the vehicle is to be parked, if a separate parking dedicated button (not started) provided on the driver's seat side of the vehicle is pressed, the electronic control unit that senses the driving of the second driving motor 100, As the support member 70 moves forward, the friction pads 20a and 20b come into contact with the disk 10, and the rotation of the disk 10 is constrained by the self-energizing effect according to the wedge shape, thereby safely parking the vehicle. You can.

As described in detail above, the vehicle disk brake according to the present invention maintains a constant distance between the disk and the friction pad by advancing the supporting member by the second driving motor even when the wear due to the friction between the disk and the friction pad proceeds. It is possible to solve the problem of longer brake operation time due to wear, and to support the disc and friction pad by advancing the support member by the second driving motor even when the vehicle is to be parked. There is an effect that can park the vehicle safely by the self-actuating effect.

Claims (5)

A slidable caliper housing; A friction pad in contact with the disk to generate a friction force; A wedge member having a friction pad fastened to a front surface thereof and having a wedge-shaped protrusion formed on a rear surface symmetrically with a predetermined inclination angle with respect to the rotational direction of the disk; A support member having an inclined surface corresponding to the wedge shape of the wedge member to support the wedge member; A movable member disposed between the wedge member and the support member and pushing the wedge member to bring the friction pad into contact with the disk; In the disk brake for a vehicle comprising a first drive motor connected to the movable member to adjust the forward and backward movement of the movable member, The support member has a cylindrical portion protruding on the other side of the inclined surface, a male thread is formed on the outer peripheral surface of the cylindrical portion and a through hole is formed in the inner side so that the first driving motor is accommodated. A ring member rotatable to adjust a forward and backward movement of the support member by forming a female thread on an inner circumferential surface and a gear train on an outer circumferential surface so as to engage with a male screw formed on the cylindrical portion of the support member; And a second drive motor connected to the ring member to adjust a rotational movement of the ring member. The method of claim 1, The caliper housing has an accommodating portion for accommodating the cylindrical portion of the ring member and the support member, and engaging jaws for limiting the forward and backward movement of the ring member are formed on both front and rear sides of the ring member, and the ring member and the engaging jaw The disc brake for a vehicle, characterized in that a bearing member for supporting the rotational movement of the ring member is inserted therebetween. The method of claim 2, A first reduction gear disposed between the movable member and the first driving motor to reduce a rotation speed of the first driving motor; And a second reduction gear disposed between the ring member and the second driving motor to reduce the rotational speed of the second driving motor. The method of claim 3, wherein The first reduction gear is a vehicle disk brake, characterized in that consisting of planetary gears. The method of claim 3, wherein The second reduction gear is a disc brake for a vehicle, characterized in that consisting of a spur gear.

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