JP2649933B2 - Disc brake friction pad support mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention 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 for a floating caliper type disc brake.

[Conventional technology]

The conventional floating caliper type disk brake has a structure in which friction pads are arranged on both sides of a disk rotor, and the friction pads are held by a pad support fixed to the vehicle body so as to be able to slide in the axial direction of the disk rotor. A brake force is obtained by pressing the friction pad with a hydraulic cylinder. In this type of disc brake, when the friction pad presses and clamps the disc rotor, the braking force received by the friction pad is transmitted effectively and evenly to the supports located on both sides of the friction pad. Is needed. Focusing on such points, as a conventional disc brake friction pad support mechanism,
One disclosed in Japanese Patent Publication No. 60-56930 is known. As shown in FIG. 5, a hammerhead-shaped sliding shoulder 2 is provided at both ends of a friction pad 1 while a U-shaped sliding guide groove 3 for receiving the sliding shoulder 2 is formed. A support 4 is provided, and an upper portion of the support 4 forms an opening for disposing the friction pad 1. In the friction pad support mechanism, when the support on the local retraction side is deformed due to an increase in the braking force during the braking operation, the sliding shoulders 2 on both sides come into contact with the sliding guide grooves 3 of the support 4, and the braking force is increased. It is known that can be distributed to the support.

[Problems to be solved by the invention]

By the way, in this type of disc brake device, a force toward the centrifugal direction acts on the friction pad on the inflow side of the disc rotor and a force toward the centripetal direction on the outflow side of the disc rotor when the brake is operated. In addition, a rotational moment M is generated in the friction pad itself. But,
In the friction pad support mechanism having the above-described conventional structure, the sliding guide groove in the support is open toward the outside of the disk rotor, so that the floating of the friction pad on the rotor reciprocating side cannot be suppressed. In addition, there has been a problem that the braking force cannot be distributed to both sides of the support rotor in and out of the support continuously from the initial stage of the brake. For this reason, there is a disadvantage that the support of the friction pad becomes very unstable, and noise and judder are generated during braking. In the apparatus described in the above publication, the upper edge of the sliding shoulder of the friction pad located on one side of the disk rotor is engaged with the caliper, but the caliper of the movable member is also a source of noise and judder. Was also a problem.

The present invention focuses on the conventional problems described above,
The object of the present invention is to provide a friction pad support mechanism for a disc brake that has a structure capable of continuously distributing the support satisfactorily from the initial stage and effectively preventing the occurrence of brake noise and judder due to the lifting of the friction pad during braking. And

[Means for solving the problem]

In order to achieve the above object, a friction pad support mechanism for a disk brake according to the present invention holds a friction pad disposed opposite to both sides of a disk rotor so as to be movable in an axial direction of the disk rotor by a support. A disc brake adapted to receive a braking force from the friction pad associated with an operation of a piston of a hydraulic actuator provided on a caliper straddling the disc rotor, wherein an inner peripheral portion of the friction pad on the disc rotor reciprocating side; An engagement step portion for transmitting a braking force is formed on the support, and a first anchor portion for locking the engagement step portion is provided on the support; A second anchor portion forming an engagement surface on a plane orthogonal to a plane including the shaft and the piston shaft; It has a structure provided with a third anchor part forming the engagement surface along the radial direction of the rotor receiving the braking force from the friction pad. In this case, the engagement surface of the second anchor portion may be formed as a surface that supports a tangential force centered on the first anchor portion by the braking action, and faces the tangential force and forms an acute angle with the tangential direction. What is necessary is just to form as an engagement surface.

[Action]

According to the above configuration, a rotational force that attempts to follow the disk rotor acts on the friction pad that sandwiches the disk rotor with the braking action. This braking force is received by the first anchor portion of the support from the engagement step portion of the inner peripheral portion of the friction pad on the inflow side of the disk rotor, and at the same time, the rotor radiation of the support in contact with the edge of the friction pad on the disk rotor exit side The third anchor section along the direction will be received. Further, a rotational moment acts on the friction pad due to the rotational tangential force of the braking force, so that a lifting phenomenon tends to occur on the reciprocating side of the disk rotor. However, the second anchor portion prevents the outer edge of the friction pad from being lifted. In this case, since the second anchor portion has an engaging surface that faces obliquely so as to support a tangential force of an arc centered on the first anchor portion, the friction pad that contacts the second anchor portion is a brake. By the action, the engagement state in which the rotational tangential force is supported is achieved, and the sliding along the tangential direction is prevented at the same time as the floating of the friction pad is prevented. As a result, the support uniformly supports the braking force on the rotor inward and outward sides of the friction pad, and at the same time, prevents the friction pad from rising and slipping in the rotor rotation direction, and is supported by the support stably. Noise and judder are prevented from occurring.

〔Example〕

Hereinafter, a specific embodiment of a friction pad 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 pad support mechanism of a disk brake according to an embodiment, and is a view of an inner side as viewed from a disk rotor side. This disc brake has a support 12 formed in a U-shaped cross section so as to straddle the disc rotor 10.
The support 12 has an inner bridge 14 which is located on one side of the disk rotor 10 and serves as a mounting side to the vehicle, and is fixed to the vehicle by screw holes 16 at both ends. An outer bridge (not shown) is located on the other side of the disk rotor 10. The inner bridge 14 has a friction pad 18
An opening 20 for holding the friction pad 18 is formed so as to substantially conform to the outer shape of the friction pad 18. The friction pad 18 has a friction member 24 fixed to the surface of a back metal 22.The back metal 22 is formed in a substantially symmetrical plane substantially fan shape, and engagement step portions 26R and 26L are provided at both ends of an inner peripheral edge. The shoulders 28R and 28L on the outer peripheral side are formed substantially at right angles to each other and have a plane perpendicular to the plane including the axis of the piston 30 and the axis of the disk rotor 10. In this case, the engagement step portion
26R, 26L may act center O ₁ and the disk rotor 10 of the piston 30 to the friction pad 18 gives a pressing force for the braking action
Has an engagement surface parallel to the line connecting the rotation center O _{2 of}
Engagement steps 26R, 26L located on the reciprocating side of disk rotor
The brake force is transmitted to the support 12 by contacting the engagement surface of the support 12 with the support 12.

On the other hand, the support 12 receiving the braking force from the friction pad 18 firstly engages with engagement step portions 26R and 26L provided on the inner peripheral side of the friction pad 18 so that the friction pad 18 The first anchor portions 32R and 32L which regulate the movement in the direction and receive the braking force from the friction pad 18 are formed. The engagement surfaces of the first anchor portions 32R and 32L are
It is directed to a round-in side, are formed in parallel (in the drawing the vertical direction) and a line connecting the rotational center O ₂ of the working center O ₁ and the disk rotor 10 of the piston 30 described above. Also friction pads
The second anchor portion 34 corresponding to the shoulder portions 28R and 28L of the 18 back metal 22
R, 34L are formed, this is the first anchor portion 32R, 32L
An engagement surface is formed obliquely to the tangential direction of the arc centered at. Specifically, in order to prevent the friction pad 18 from lifting up, the friction pad 18 has an engagement surface along a surface (horizontal plane in the drawing) orthogonal to the engagement surface of the first anchor portions 32R, 32L. Further, a side end surface of the friction pad 18 below the shoulder portions 28R and 28L is a surface along the radial direction of the disk rotor 10, and the support surface 12 faces the dispensing side of the disk rotor 10 among the end surfaces. Are formed with third anchor portions 36R and 36L having an engagement surface along the end surface of the friction pad 18.

Although not shown, an outer bridge is arranged on the support 12 on the side opposite to the inner bridge 14,
A friction pad having a similar configuration is arranged on the outer bridge via a caliper 38.

The operation of the friction pad supporting mechanism of the disk brake configured as described above is as follows. That is, when the brake operation is performed while the disk rotor 10 is rotating in the direction of arrow A in the drawing when the vehicle advances, the braking force from the friction pad 18 is applied to the first right side of the bridge of the support 12 on the reciprocating side of the disk rotor 10. It is received by the anchor part 32R and the third anchor part 36L on the circulation side of the disk rotor 10. For this reason, the braking force received by the support 12 is continuously distributed to the reciprocating side and the revolving side of the disk rotor 10 from the initial stage of braking, and the force acting on the support 12 due to the braking force is reduced. Then, a rotational moment is generated in the friction pad 18 by the brake tangential force applied to the friction pad 18, and a lifting force is generated at the end of the friction pad 18 on the reciprocating side of the disk rotor 10. This lifting is held and prevented by the second anchor portion 34R, and at the same time, since the engagement surface of the second anchor portion 34R is formed as a surface intersecting with the brake tangential force, the friction pad 18 itself is Sliding movement along the engagement surface of the portion 34R is also prevented. That is, as shown in FIGS. 2 and 3, the friction pad 18 is initially in a floating state with respect to the support 12 (FIG. 2), but a friction force is generated by pressing the friction pad 18 against the disk rotor 10 by a braking operation. I do. As a result, due to the brake tangential force and the rotational moment applied to the friction pad 18, the friction pad 18 moves between the clearance with the support 12 to find a fulcrum, and engages the support 12 with the stable points as anchor points A, B, C. (Fig. 3). In such a state, even if the component is elastically deformed due to an increase in the force, the supporting relationship shown in FIG. As a result, the friction pad 18 is fixedly held, the rotation around the anchor point is safely regulated, and the vibration of the friction pad 18 is suppressed. When the pressing force of the friction pad 18 is released, the friction pad 18 returns to a floating state.

When the disk rotor 10 rotates in the opposite direction as shown by the arrow B in FIG. 1, the reciprocating sides of the disk rotor 10 are opposite, so the first anchor portion 32L and the second anchor portion 34L on the left side. And the third anchor portion 36R on the right side functions, and the same operation and effect are exhibited.

In the above embodiment, the engagement surface of the second anchor portions 34R, 34L is a horizontal plane orthogonal to the engagement surface of the first anchor portions 32R, 32L, but this is an angle formed by a line passing through the anchor points A, B. May be an engagement surface having an acute angle. Therefore, as shown in FIG. 4, the tangential force F generated at the second anchor portion by the braking action may be formed as a surface facing and supporting the tangential force F, and the angle θ between the tangential force F and the engaging surface may be an acute angle. If it works, it works. The third anchor portion 36R, although the radial direction of the disk rotor the joint surface of 36L, which is not necessarily pass through the rotation center O ₂ of the disc rotor 10.

〔The invention's effect〕

As described above, according to the present invention, the brake tangential force and moment applied to the friction pad are supported by the first anchor portion and the second anchor portion when the disc rotor is turned in, and the rotor radial direction Is supported by the third anchor section along the axis, so that the rotation around the anchor point is reliably regulated, the vibration of the friction pad is suppressed, and the effect that brake noise and judder can be prevented can be obtained. Can be

[Brief description of the drawings]

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 view of the support mechanism in a non-braking state, FIG. 3 is a schematic view of a braking state, and FIG. FIG. 5 is an explanatory view of a formation angle of an anchor portion engaging surface, and FIG. 5 is a cross-sectional configuration diagram of a conventional friction pad support mechanism of a disc brake. 10 ... Disc rotor, 12 ... Support, 18 ... Friction pad, 26R, 26L ... Engagement step, 28R, 28L ... Shoulder, 32
R, 32L ... first anchor part, 34R, 34L ... second anchor part,
36R, 36L ... The third anchor section.

Claims (1)

(57) [Claims] 1. A hydraulic operating device provided on a caliper straddling the disk rotor, wherein friction pads arranged on opposite sides of the disk rotor are supported by a support so as to be movable in the axial direction of the disk rotor. In a disc brake configured to receive a braking force from the friction pad accompanying the operation of a piston, an engagement step portion for transmitting a braking force is formed on an inner peripheral portion of the friction pad on the disc rotor reciprocating side, and The support has a first anchor portion that locks the engagement step portion, and engages with a plane that faces the outer peripheral portion of the friction pad on the disk rotor reciprocating side and is orthogonal to a plane including the axis of the rotor and the axis of the piston. A second anchor portion forming a surface, and an engagement surface receiving a braking force from a friction pad along a radial direction of the disk rotor on the disk rotor outlet side. Friction pad supporting mechanism of the disc brake, characterized in that a and third anchor portion eggplant.