JPH10159879A - Disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the lopsided wear of a pad and noise and made a support lighter. SOLUTION: An outer pad 32 is supported on a caliper pawl 40 via an engagement protrusion 42 and its braking torque is transmitted through a caliper 12 and a main guide pin 20 on the rotor turn-out side to a support fixed to a body. An inner pad 46 has pad anchors 54, 56 under both rotor peripheral sides of a back plate 50 to be engaged with support anchors 58, 60 provided for the support 18. The braking torque of the inner pad 46 is transmitted to the support 18 by engaging the pad anchor 56 on the rotor turn-in side with the support anchor 60.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake, and more particularly to an improvement in a disc brake for supporting a braking torque of an outer pad on a vehicle body via a caliper.

[0002]

2. Description of the Related Art Conventionally, a disc brake has a caliper sliding mechanism formed by fitting a pin hole provided on a side of a hydraulic cylinder of a caliper with a guide pin attached to a support and extending in a direction opposite to a rotor. There is a type in which a caliper claw is held by uneven fitting to transmit a braking torque of an outer pad to a support fixed to a vehicle body via the caliper claw and a guide pin of a caliper sliding mechanism. The inner pad of the disc brake is supported by a support so as to be movable in the rotor axial direction.

[0003] In the conventional disc brake constructed as described above, the inner pad is pressed against the rotor by a hydraulic cylinder provided on the inner side of the caliper.
The outer pad is pressed against the rotor by the outer caliper claw by the movement of the caliper in the rotor axis direction due to the reaction force. The braking torque of the outer pad pressed against the rotor is transmitted to the support fixed to the vehicle body via the caliper claw and the main guide pin on the rotor outlet side for guiding the caliper in the rotor axial direction as described above. , And the braking torque of the inner pad is supported by an anchor portion formed on the rotor outlet side of the support.

[0004]

The conventional disk brake as described above has a caliper claw that receives a braking torque of an outer pad and an operating point that transmits the braking torque to a support via a main guide pin in a rotor axial direction. Is large, a large bending moment acts on the caliper in a direction perpendicular to the rotor axis. For this reason, the caliper is displaced so that the rotor outlet side of the outer caliper pawl and the rotor inlet side of the inner hydraulic cylinder approach the rotor, causing uneven wear to the friction pad and noise. It causes the occurrence. Moreover, the support diverting side is
In addition to receiving the braking torque of the outer pad via the main guide pin, it also receives the braking torque of the inner pad via the anchor section, and increases the rigidity of the support so that it does not deform even when these braking torques act. This requires a large and heavy-weight support, which leads to an increase in the size and weight of the disc brake.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the prior art, and provides a disk brake capable of reducing uneven wear of pads and generation of noise and reducing the weight of a support. It is an object.

[0006]

In order to achieve the above-mentioned object, a disk brake according to the present invention presses an inner pad and an outer pad against a rotor by hydraulic means provided on a caliper, and brakes the outer pad. In a disc brake for transmitting torque to a support via a caliper claw and a guide pin on a rotor exit side for guiding the caliper in a rotor axial direction, an anchor portion provided on the rotor entry side of the inner pad and a support provided on the support And a torque receiving portion that engages with the anchor portion.

[0007]

According to the present invention constructed as described above, the braking torque of the inner pad is a so-called pull anchor that transmits the braking torque of the inner pad to the support via an anchor provided on the rotor reciprocating side of the inner pad, and the braking torque of the outer pad is transmitted to the rotor. The so-called push anchor, which transmits to the support via the guide pin on the exit side, can reduce torsional deformation such that the inner side and the outer side of the caliper are displaced toward the rotor, and the behavior of the pad is stabilized. Thus, uneven wear of the pad and generation of noise can be reduced. In addition, the braking torque of the inner pad is pulled and supported by the anchor, and the braking torque of the outer pad is pushed and supported by the anchor to disperse the braking torque acting on the support, thereby reducing the required rigidity of the support. Thus, the size and weight of the support can be reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a disc brake according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of a disk brake according to an embodiment of the present invention, and a view as viewed from an outer side where an outer pad is omitted. FIG. 2 is a view as viewed from an inner side. In these figures, the disc brake 10 is disposed with a caliper 12 straddling a rotor 16 rotating as shown by an arrow 14. The caliper 12 is supported movably in the axial direction of the rotor 16 by a support 18 fixed to a vehicle body (not shown). That is, the caliper 12
The main guide pin 20 is mounted on the outgoing side of the rotor 16 in parallel with the rotor shaft, and the sub-guide pin 22 is mounted on the inward side of the rotor 16 in parallel with the main guide pin 20. Guide holes 20, 22 formed in the support 16 are formed in the guide holes 2 of the arm portions 24, 26.
8 is slidably inserted.

The support 18 is disposed on the inner side of the rotor 16, the arm portions 24, 26 are located outside the outer peripheral edge of the rotor 16, and extends to the outer side across the rotor 16. doing. And support 18
Is fixed to the vehicle body through a screw hole 30 at a position closer to the center of the rotor than these arms 24 and 26. The main guide pin 20 is formed to have a larger diameter than the sub guide pin 22, and transmits the braking torque of the outer pad 32 to the support 18 as described later. And the small-diameter sub guide pin 22
Is formed to have a thickness such that a gap is formed between it and the wall surface of the guide hole 28, and a guide bush 33 is attached to the tip so that the caliper 12 can be moved and guided in parallel with the rotor shaft. It is.

The outer pad 32 includes a lining 34 facing the outer surface of the rotor 16 and a back metal 3 holding the lining 34.
6. And the outer pad 32 is
It is mounted on a pair of caliper pawls 40 formed on the outer side of the caliper 12, and transmits a braking torque when the lining 34 is pressed against the rotor 16 to the caliper pawls 40 as described later. That is, the outer pad 32 is provided with the engagement protrusion 42 on the back surface of the back metal 36, and is mounted on the caliper claw 40 by inserting the engagement protrusion 42 into the engagement hole 44 formed in the caliper claw 40, and The braking torque is applied via the projection 42 to the caliper pawl 40.
To be communicated to. And the caliper claw 40
Is transmitted to the arm 24 of the support 18 via the main guide pin 20 and is supported by the vehicle body via the support 18.

On the inner side of the rotor 16, an inner pad 46 is disposed facing the inner pad. The inner pad 46 includes a lining 48 and a back metal 50 as in the case of the outer pad 32. And the inner pad 46 is the support 1
8 and is supported by the support 18 so as to be movable in the axial direction of the rotor, and a hydraulic cylinder (provided on the inner side of the caliper 12), as will be described in detail later. It is pressed by the hydraulic means 51 and moves in the axial direction of the rotor, and is pressed against the inner surface of the rotor 16. In addition, the back metal 50 of the inner pad 46 is provided.
The pad anchor portions 54 and 56 for transmitting the braking torque of the inner pad 46 to the support 18 are formed so as to protrude downward at lower portions on both sides in the rotor circumferential direction. Further, the pad anchors 54 and 56 have anchor surfaces on opposite sides, and these anchor surfaces are support anchors 58 and 60 which are torque receiving portions formed on the support 18.
Is facing the anchor surface 62 of the head.

The support anchors 58 and 60 are provided for the support 1
8 is formed on the bottom surface of the pad disposing recess 52 so as to protrude in the rotor outer peripheral direction, and is formed in a protruding shape.
Is inserted into a concave portion 64 formed between the pad anchor portions 54 and 56 of FIG. For this reason, the pad anchors 54, 56
Are located outside the support anchors 58 and 60 and transmit the braking torque of the inner pad 46 at the time of braking to the support anchor 60 (or the support anchor 58) on the rotor reversing side. It is.
Each of the support anchors 58 and 60 has an anchor surface 62.
, The braking torque of the inner pad 46 is received via the inner pad 46, the displacement of the inner pad 46 in the rotor circumferential direction is restricted, and the inner pad 46 serves as a guide for guiding the inner pad 46 in the axial direction of the rotor 16. Further, each of the support anchors 58 and 60 has a flat upper support surface, and supports the back metal 50 of the inner pad 46.
The back metal 50 has the lower ends of the pad anchors 54 and 56 in contact with and supported by the bottom surface of the pad arrangement recess 52 of the support 18, and has shoulders 66 and 68 on both sides in the rotor circumferential direction on the outer edge of the rotor. The shoulders 66 and 68 are engaged with jaws 70 and 72 provided on the opposite sides of the arms 24 and 26 of the support 18 so as to project outward in the rotor radial direction. Movement is blocked.

In the embodiment configured as described above, the rotor 16 rotates as indicated by an arrow 14 shown in FIG. When the brake pedal of the vehicle is depressed, hydraulic oil is supplied to the hydraulic cylinder 51, and the hydraulic cylinder 51 presses the inner pad 46 to move the inner pad 46 in the axial direction of the rotor, and presses the inner pad 46 against the inner surface of the rotor 16. . Accordingly, the caliper 12 moves toward the inner side due to the reaction force, and the caliper claw 40 on the outer side presses the outer pad 32 against the outer surface of the rotor 16. Then, the braking torque of the outer pad 32 is transmitted to the caliper claw 40 via the engagement protrusion 42. This caliper claw 4
The braking torque transmitted to 0 is further transmitted to the arm portion 24 of the support 18 via the main guide pin 20 provided on the rotor outlet side, and then supported by the vehicle body to which the support 18 is fixed. On the other hand, as the inner pad 46 is dragged by the rotor 16 and moves in the circumferential direction of the rotor, the pad anchor portion 56 formed on the rotor reciprocating side of the back metal 50 causes the braking torque of the inner pad 46 to be equal to that of the support anchor 60. Engagement is transmitted to the support 18 via the pad anchor portion 56 and is supported by the vehicle body.

As described above, in the embodiment, a so-called push anchor that transmits the braking torque of the outer pad 32 to the support 18 via the caliper 12 and the main guide pin 20 on the rotor outlet side is used as a so-called push anchor, and the braking of the inner pad 46 is performed. By using a so-called pull anchor for transmitting the torque to the support via a pad anchor portion 56 provided on the rotor entry side of the inner pad 46, the rotor exit side of the outer pad 32 and the rotor entrance side of the inner pad 46 are connected. Can be reduced to the extent that is displaced toward the rotor 16 side. For this reason, the behavior of the friction pads (the outer pad 32 and the inner pad 46) is stabilized, and the pad lining 3
It is possible to prevent uneven wear of 4, 48 and generation of noise. Moreover, the outer pad 3 acting on the support 18
Since the braking torque of the support pad 2 and the inner pad 46 is dispersed, the required rigidity of the support 18 can be reduced, and the size and weight of the support 18 can be reduced.

When the vehicle traveling backward is braked, the braking torque of the inner pad 46 is supported by the support anchor 58 via the pad anchor 54 on the rotor reversing side when the vehicle is traveling backward. . Further, the braking torque of the outer pad 32 is the same as that of the forward movement of the vehicle.
After being transmitted to the caliper claw 40 through the second guide pin 2, it is transmitted to the support 18 through the main guide pin 20.

[0017]

As described above, according to the present invention, a so-called pull anchor for transmitting the braking torque of the inner pad to the support via an anchor portion provided on the rotor reciprocating side of the inner pad is provided. Because it is a so-called push anchor that transmits the braking torque of the caliper to the support via the guide pin on the rotor exit side, it is possible to reduce torsional deformation such that the inner side and the outer side of the caliper are displaced to the rotor side, The behavior of the pad is stabilized, and uneven wear of the pad and generation of noise can be reduced. In addition, the braking torque of the inner pad is pulled and supported by the anchor, and the braking torque of the outer pad is pushed and supported by the anchor to disperse the braking torque acting on the support, thereby reducing the required rigidity of the support. Thus, the size and weight of the support can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a disk brake according to an embodiment of the present invention and a view seen from an outer side.

FIG. 2 is a view of the disc brake according to the embodiment as viewed from an inner side.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Disc brake 12 Caliper 16 Rotor 18 Support 20, 22 Guide pin (main guide pin, sub guide pin) 32 Outer pad 40 Caliper claw 46 Inner pad 51 Hydraulic pressure means (hydraulic cylinder) 54, 56 Anchor part (pad anchor part) 58, 60 Torque receiver (support anchor) 62 Anchor surface

Claims (1)

[Claims] An inner pad and an outer pad are pressed against a rotor by hydraulic means provided on a caliper, and a braking torque of the outer pad is adjusted by a caliper claw and a guide pin on a rotor outlet side for guiding the caliper in a rotor axial direction. A disc brake for transmitting to a support via a disk, comprising: an anchor portion provided on a rotor revolving side of the inner pad; and a torque receiving portion provided on the support and engaged with the anchor portion. brake.