JPH01224532A - Supporting mechanism for friction pad of disc brake - Google Patents

Abstract

PURPOSE:To prevent generation of brake noise and shudder, by forming engaging step parts for brake force transmission on the inner circumference of a friction pad in the side of rotating-in of a disc rotor, and by providing the first, second, and third anchor parts in a support. CONSTITUTION:Engaging step parts 26R, 26L are formed in opposition to each other at both ends of the inner circumference edge of the back metal 22 of a friction pad 18, and anchor parts are formed in a support 32: the first anchor parts 30R, 30L engage the engaging step parts 26R, 26L provided on the inner circumference side of the friction pad 18, the second anchor parts 32R, 32L have engaging surfaces along the end surfaces of the friction pad 18, and the third anchor parts 38R, 38L receive floating-up of the friction pad 18 in the side of rotating-in of the disc rotor at braking. Hereby rotation around the anchor parts are surely controlled, and vibration of the friction pad is restrained. Thus the generation of brake noise and shudder can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a friction pad support mechanism for a disc brake, and more particularly to an improvement in a friction pad support mechanism used in a floating caliper type disc brake.

[Conventional technology]

Conventional floating caliper type disc brakes have a structure in which friction pads are placed on both sides of the disc rotor, and these are held by pad supports fixed to the vehicle body so that they can slide in the axial direction of the disc rotor. Braking force is obtained by pressurizing the friction pads with a hydraulic cylinder. In this type of general structure, as shown in FIG. 5, guide protrusions 2 are provided on both sides of a friction pad 1, and a pad support 3 is provided with a fitting recess 4 that fits the protrusions 2. The brake force is applied at the joint. However, since the braking force acts only on the rotation side of the disc rotor, there is a problem in that the pad support is greatly deformed. The braking force received is Pi! There was a need for effective distribution and transmission to the supports on both sides of the rubbing pad. As a conventional friction pad support mechanism for a disc brake that focuses on this point, the one disclosed in Japanese Patent Publication No. 60-56930 is known. As shown in FIG. 6, there are hammerhead-shaped sliding shoulders 5R on both ends of the friction pad 1.
15L, and on the other hand, a 0-shaped sliding guide groove 6R16L with an open outer peripheral side to receive this sliding shoulder 5R15L.
It has a support 7 structure. In such a friction pad support mechanism, when the brake is applied, the sliding shoulder 5R on the rotation side of the disc rotor first comes into contact with the sliding guide groove 6R of the support 4, and then the deformation of the rotation side member of the support 7 increases. By doing so, the sliding shoulder portion 5L comes into contact with the sliding guide groove 6L of the support 4 in stages on the rotation side of the disc rotor, so that the braking force is evenly distributed to the support.

[Problem to be solved by the invention]

By the way, in this type of disc brake device, when the brake is applied, a centrifugal force acts on the friction pad on the rotation side of the disc rotor, and a centripetal force acts on the friction pad on the rotation side of the disc rotor, and as a result, , rotational moment) M is generated in the friction pad itself. However, in the disc brake shown in Figure 5, the entire load of the brake tangential force is received on the output side of the disc rotor, so the input side of the disc rotor is in a floating state, causing the band to lift and reducing the sliding properties of the pad. There was a drawback that the problem was extremely deteriorated and shudder and noise were generated. In addition, in the friction pad support mechanism shown in Fig. 6, the sliding guide groove in the support opens toward the outside of the disc rotor, and there is a problem that it is impossible to prevent the friction pad from floating on the rotor entry side. If there is no deformation of the support in the initial stage, the brake tangential force is supported only on the rotation side of the disc rotor, so the rotation side of the disc rotor tends to vibrate, and the support of the friction pad becomes extremely inadequate. Although it became unstable, it still had the disadvantage of generating noise and jag during braking. In the device described in the above publication, the upper edge of the sliding shoulder of the friction pad located on one side of the disc rotor is engaged with the caliper, but the caliper, which is a movable member, similarly generates noise and jag. This was still a problem because it was the source of the problem.

The present invention has focused on the above-mentioned conventional problems, and has developed a friction pad for a disc brake that has a structure that can effectively prevent the occurrence of brake noise and jag due to lifting of the friction pad while stabilizing anchoring during braking. The purpose is to provide a support mechanism.

[Means to solve the problem]

In order to achieve the above object, a friction pad support mechanism for a disc brake according to the present invention holds friction pads arranged facing each other on both sides of a disc rotor so as to be movable in the axial direction of the disc rotor. In the disc brake configured to receive the braking force from the friction pad, a retaining step portion for transmitting the brake force is formed on the inner circumferential portion of the friction pad on the side where the disc rotor enters, and the retaining step portion is formed on the support. a first anchor portion that locks the connecting step portion; and a second anchor portion that is formed along the radial direction of the disc rotor on the disc rotor rotation side and forms an engagement surface with the friction pad side end face. , a third anchor portion comprising a concave-convex fitting portion formed between the side end surface of the friction pad on the disk rotor insertion side and a pad support facing the same, and supporting at least the upper surface of the fitting portion of the friction pad; The configuration includes the following.

[Effect]

According to the above configuration, during the braking operation, a force in the circumferential direction of the rotor that tends to follow the disc rotor acts on the FJPIF pads that sandwich the disc rotor. This braking force is received by the first anchor part of the support from the engagement step on the inner periphery of the friction pad on the rotation side of the disc rotor, and at the same time, the rotor radiation of the support that contacts the edge of the friction pad on the rotation side of the disc rotor. A second anchor portion along the direction receives the support. Therefore, the braking force is distributed to both ends of the pad support from the initial stage of braking. Furthermore, a rotational moment acts on the friction pad due to the braking force, and a lifting phenomenon tends to occur on the rotation side of the disc rotor, but this occurs due to the uneven fitting provided on the edge of the friction pad on the rotation side of the disc rotor. The third anchor section prevents this. As a result, the support supports the braking force on the rotor rotation side of the *m pad, and at the same time prevents the friction pad from lifting up and sliding in the rotor rotation direction, and is stably supported by the support, rotor rotation and rotation. This eliminates the floating state of the friction pads on both exit sides, provides stable anchoring, and prevents brake noise and jug.

〔Example〕

Hereinafter, specific embodiments of the friction band support mechanism for a disc brake according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view of a friction band support mechanism of a disc brake according to an embodiment, as viewed from the disc rotor side to the inner side. This disc brake has a support 1 formed in a U-shaped cross section so as to straddle the disc rotor 10.
2, this support 12 is provided with an inner bridge 14 located on one side of the disc rotor 10 and attached to the vehicle, and has screw holes 1G, 1G at the circumferential end of the rotor.
is fixed to the vehicle by. An outer bridge (not shown) is located on the other side of the disc rotor 10. An opening 20 for holding the friction pad 18 is formed in the inner bridge 14 so as to substantially match the outer shape of the friction pad 18 . The friction pad 1 has a friction member 24 fixed to the surface of a backing metal 22, and the backing metal 22 is formed into a symmetrical planar substantially fan shape, and engagement step portions 26R126L are provided at both ends of the inner circumferential edge. They are formed facing each other. In this case, the engagement step portion 26R126L is an engagement surface parallel to a line connecting the center of action 01 of the piston 28 that applies a pressing force for braking to the friction pad 18 and the center of rotation 0□ of the disc claw 10. has
Engagement step portion 26R located on the rotation side of the disc rotor 10
The engaging surface of 126L is brought into contact with the support 12 to transmit braking force to the support 12.

On the other hand, the support 12 that receives the braking force from the friction pad 18 first engages with the engagement step portions 26R and 26L provided on the inner circumferential side of the friction pad 1B. The friction pad 18 regulates movement in the left and right direction.
The first anchor part 30R130L receives the braking force from
is formed. The engagement surface of the first anchor portion 30R130L is directed toward the rotation side of the disc rotor 10, and is parallel to the line connecting the action center 01 of the piston 28 and the rotation center O3 of the disc rotor 10 (perpendicular in the figure). direction). Further, the side end face of the friction pad 18 is formed as an inclined face along the radial direction of the disc rotor 10, and the rotation center Ox of the disc rotor 10 on this end face
A second anchor portion 32R1 having an engagement surface along the end surface of the friction pad I8 on the support 12 facing the lower half of the friction pad I8.
32L is formed. Therefore, the second anchor portions 32R, 32L are also sloped surfaces along the radial direction of the disc rotor 10, and receive the braking force from the friction pad 24 on the rotation side of the disc rotor 10 during braking. Furthermore, on the side end surface of the friction pad 18, a guide protrusion 34 is provided on the upper part of the third anchor part 32R132L, that is, in the half part closer to the outer circumference of the rotor, which protrudes toward the support 12 facing the third anchor part 32R132L. U-shaped grooves 36 are provided on both sides of the rotor in the circumferential direction, and one side of the support 12 has a U-shaped groove 36 into which the guide protrusion 34 is inserted.

A concave groove 36 facing the upper surface of the guide protrusion 34
The surface of the receiver is a third anchor portion 38R138L, and is adapted to receive the lifting of the friction pad 18 on the disk rotor rotation side during braking.

Although not shown, an outer bridge is disposed on the opposite side of the support 12 from the inner bridge 14, and friction pads are disposed in a similar configuration on this outer bridge as well.

The operation of the friction band support mechanism of the disc brake constructed as described above is as follows. That is, Fig. 3 (1
) to (2), when the disc rotor 10 is rotating in the direction of the arrow X in the figure and a braking operation is performed, the braking force from the friction pad 18 is applied to the support () 12 on the rotation side of the disc rotor 10. First anchor part 3 on the right side of the bridge
0R and the second anchor portion 3 on the rotation side of the disc rotor 10
You can take it at 2L. Therefore, the braking force that the support 12 receives is distributed between the input side and the output side of the disc rotor 10, and the force acting on the support 12 to deform due to the braking force is reduced ((1) in the figure). And F¥! Rubbing pad 1
A rotational moment is generated on the friction pad 1 due to the brake tangential force applied to the brake pad 8, and a lifting force is generated at the end of the friction pad 18 on the rotation side of the disc rotor 10. This floating is held and prevented by the third anchor portion 38R ((2) in the figure). That is, initially the friction pad 18
is in a floating state with respect to the support 12, but a frictional force is generated by pressing the friction pad 18 against the disc rotor 10 by a braking operation. As a result, the brake tangential force F and rotational moment M applied to the friction band 18
As a result, the friction pad 18 moves between the clearance with the support 12 in search of a fulcrum, and the stable point is set at anchor points A, B,
It engages with the support 12 as C. In such a state, even if the force increases and the component parts are elastically deformed, the support relationship shown in FIG. 3(2) remains unchanged and the component parts follow the deformation.

As a result, the friction pad 18 is held fixedly, and rotation around the anchor point is completely regulated, so that the friction pad 18 is held fixedly.
8 vibration is suppressed. and friction pad 18
By releasing the pressing force, the friction pad 18 returns to a floating state.

Further, when the disc rotor 10 rotates in the opposite direction, the rotation side of the disc rotor 10 is opposite, so the first anchor part 30L, the second anchor part 32R, and the third anchor part 38L on the left side function, and the same Effects and effects are demonstrated.

Next, FIG. 4 shows a friction pad support mechanism for a disc brake according to a second embodiment. In this embodiment, the second anchor portions 32R, 32L are arranged on the outer peripheral side of the friction pad 18,
The only difference is that the third anchor parts 38R, 38L are arranged on the rotation center o2 side of the disc rotor 10.

In this embodiment as well, the pulling anchor action by the first anchor part 30R130L and the anti-lifting action by the third anchor part 38R138L are performed on the retraction side of the disc rotor 10, and at the same time, the second anchor action is performed on the retraction side of the disc rotor 10. A push anchoring action is performed by the portion 32R132L, and stable anchoring is achieved. This prevents the friction pad 18 from floating on both sides of the friction pad 18, and effectively prevents the occurrence of shudder and noise.

〔Effect of the invention〕

As explained above, according to the present invention, the brake tangential force and moment applied to the friction pad are transferred to the first anchor part and the third anchor formed in the concave-convex fitting part, which act as a pulling anchor on the rotation side of the disc rotor. Since it is supported by a third anchor part formed along the radial direction of the rotor and acts as a push anchor on the rotation side of the disc rotor, rotation around the anchor point is reliably regulated. The effect is that the vibration of the friction pad is suppressed and the generation of brake noise and jags can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a friction pad support mechanism of a disc brake according to an embodiment, Fig. 2 is a schematic diagram of the same support mechanism in a non-braking state, Fig. 3 is a schematic diagram during braking, and Fig. 4 is a schematic diagram of the friction pad support mechanism in a non-braking state. A schematic diagram of a friction pad support mechanism according to an embodiment, and FIGS. 5 and 6 are cross-sectional configuration diagrams of a friction pad support mechanism of a conventional disc brake. 10...Disc cloak, 12...Support, 1st...Friction pad, 26R126L
......Engagement step part, 30R, 30L...First anchor part, 32R132L...Second anchor part, 38R, 38L...Third anchor part . Agent Patent Attorney Tomo Murakami - 1be Figure 5

Claims (1)

[Claims] (1) In the disc brake, the friction pads disposed opposite to each other on both sides of the disc rotor are held movably in the axial direction of the disc rotor by supports, and receive the braking force from the friction pads. An engaging stepped portion for transmitting brake force is formed on the inner circumferential portion of the friction pad on the disc rotor rotation side, and a first anchor portion for locking the engaging stepped portion is formed on the support, and a first anchor portion for locking the engaging stepped portion, and a first anchor portion for locking the engaging stepped portion, a second anchor part formed along the radial direction of the disc rotor on the exit side and forming an engagement surface with the side end face of the friction pad; and a second anchor part facing the side end face of the friction pad on the input side of the disc rotor. 1. A friction pad support mechanism for a disc brake, characterized in that a third anchor part is formed of a concave-convex fitting part formed between a pad support and a third anchor part that supports at least the upper surface of the fitting part of the friction pad.