JPH01216132A - Frictional pad supporting mechanism for disc brake - Google Patents

Abstract

PURPOSE:To effectively suppress brake noise and judder accompanied with the floating-up of a frictional pad on brake application by forming an engagement stepped part for brake transmission in the inner peripheral part of the frictional pad on the turning-in side of a disc rotor and forming the first - third anchor parts. CONSTITUTION:Accompanied with a brake action, a frictional pas 18 having a disc rotor 10 nipped is applied with a turning moment to follow the rotor 10. The brake power is received by the first anchor parts 32R and 32L of a support 12 from the engagement stepped parts 26R and 26L of the inner peripheral part of the pad 18 on the turning-in side of the rotor 10, and at the same time, received by the third anchor parts 36R and 36L along the radial direction of the rotor of the support 12 in contact with the edge part of the pad 18 on the turning-out side of the rotor 10. Further, the pad 18 is applied with a turning moment by the revolution tangential force of the brake power, and a floating phenomenon tends to be generated on the turing-in side of the rotor 10. However the second anchor parts 34R and 34L suppress the floating-up phenomenon onto the outer edge part of the pad 18, and the slip in the revolution direction of the rotor 10 is suppressed by the engagement surface.

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 disc brake, when the friction pad pressurizes the disc rotor,
There is a need to effectively and evenly distribute and transmit the braking force experienced by a friction pad to supports located on both sides of the friction 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. 60-5693'O is known. As shown in FIG. 5, hammerhead-shaped sliding shoulders 2 are provided at both ends of the friction pad 1, and a O-shaped sliding guide groove 3 is formed to receive the sliding shoulders 2. A friction pad 1 is provided on the upper part of the support 4.
It forms an opening for arranging the. In this friction pad support mechanism, during braking, when the support on the rotor rotation side deforms as the braking force increases, 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 known to be able to be distributed to 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 conventional friction pad support mechanism described above, since the sliding guide groove in the support opens toward the outside of the disc rotor, it is not possible to prevent the friction pad from rising on the rotor rotation side. Furthermore, due to its structure, there was a problem in that the braking force could not be continuously distributed to both sides of the rotor indentation and rotation of the support from the initial stage of braking. For this reason, the support of the friction pad becomes extremely unstable, resulting in noise and jags 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 can continuously and favorably distribute braking force to the support from the initial stage, while also effectively preventing the occurrence of brake noise and shudder caused by lifting of the friction pad during braking. The purpose of the present invention is to provide a friction pad support mechanism for a disc brake that has a structure that allows for the friction pads to be supported.

[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 a disc brake that receives a braking force from the friction pad in response to the operation of a piston of a hydraulic actuator provided on a caliper that straddles the disc rotor, an inner circumferential portion of the friction pad on the disc rotor rotation side is provided. In addition to forming a locking stepped portion for transmitting brake force, the support includes a first anchor portion that locks the engaging stepped portion, and a rotor shaft that faces the outer peripheral portion of the friction pad on the disc rotor rotation side. and a second anchor portion forming an engagement surface on a plane perpendicular to a plane including the axis of the piston and the axis of the piston, and receiving a braking force from a friction pad along the radial direction of the disc rotor on the rotation side of the disc rotor. A third anchor portion forming an engagement surface is provided. In this case, the engagement surface of the third anchor portion may be formed as a surface that supports the tangential force centered on the first anchor portion due to the braking action, and is opposed to the tangential force and forms an acute angle with the tangential direction. It is sufficient if it is formed as an engagement surface.

[Effect]

According to the above configuration, during the braking operation, a rotational force that tends to follow the disc rotor acts on the friction 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 third anchor portion along the direction receives the support. Further, a rotational moment acts on the friction pad due to the rotational tangential force of the brake force, and a lifting phenomenon tends to occur on the rotation side of the disc rotor, but a third anchor portion on the outer edge of the friction pad prevents this.

In this case, the third anchor part has engaging surfaces facing each other obliquely so as to support the force in the tangential direction of the circular arc centered on the first anchor part, so the friction pad in contact with the third anchor part is used as a brake. This results in an engaged state that supports the rotational tangential force caused by the action, thereby preventing the friction pad from lifting up and at the same time preventing it from sliding along the tangential direction. As a result, the support supports the braking force evenly on the rotor rotation side of the friction pad, and at the same time prevents the friction pad from lifting up and sliding in the rotor rotation direction, stably supported by the support, and reducing brake noise. This prevents the occurrence of jags.

〔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 sectional view of a friction pad 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 to be attached to the vehicle, and is fixed to the vehicle through screw holes 16 at both ends. 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 18 has a friction member 24 fixed to the surface of a backing metal 22, and the backing metal 22 is formed into a symmetrical fan shape with a thousand sides, and has engagement steps 26R12 at both ends of the inner peripheral edge.
6L are formed to face each other, and both shoulder portions 28R, 28L on the outer peripheral side are formed substantially at right angles with a plane perpendicular to a plane including the axis of the piston 30 and the axis of the disc rotor IO. In this case, the engagement step portion 26R
, 26L have engagement surfaces parallel to a line connecting the center of action O1 of the piston 30 that applies a pressing force for braking action on the friction pad 1 and the rotation center 0□ of the disc rotor 10, and The engagement surfaces of the engagement step portions 26R and 26L located on the rotation side are 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 18, and The friction pad 18
First anchor portions 32R, 32L that receive braking force from
is formed. The engagement surfaces of the first anchor portions 32R, 32L are directed toward the rotation side of the disc rotor 10, and the above-mentioned action center O1 of the piston 300 and the rotation center 0 of the disc rotor 10! It is formed parallel to the line connecting the lines (in the vertical direction in the figure). In addition, the back metal 22 of the friction pad 18
A second anchor portion 34R, corresponding to the shoulder portions 28R, 28L,
34L is formed, which is the first anchor part 32R,
An engagement surface is formed that is oblique to the tangential direction of the arc centered at 32L. Specifically, in order to prevent the friction pad 18 from lifting up, it has an engagement surface along a plane (horizontal plane in the figure) orthogonal to the engagement surface of the first anchor part 32R132L. Furthermore, the side end surfaces of the friction pad 18 below both shoulders 28R, 28L are surfaces along the radial direction of the disc rotor 10. A third anchor portion 36R136L having an engagement surface along the end surface of the friction pad 18 is formed in the third anchor portion 36R136L.

Although not shown, an outer bridge is disposed on the opposite side of the support 12 from the inner bridge 14, and a friction pad is disposed in the same manner on this outer bridge via a caliper 38.

The operation of the friction pad support mechanism of the disc brake constructed as described above is as follows. That is, when a brake is operated when the disc rotor 10 is rotating in the direction of arrow A in the figure while the vehicle is moving forward, the braking force from the friction pad 18 is applied to the first brake on the right side of the bridge of the support 12 on the rotation side of the disc rotor 10. It is received by the anchor portion 32R and the third anchor portion 36L of the retracted example of the disc rotor 1o. Therefore, the braking force that the support 12 receives is continuously distributed to the input side and the output side of the disc rotor lO from the initial stage of braking, and the deforming force exerted on the support 12 due to the braking force is reduced. Then, a rotational moment is generated in the friction pad 18 due to the brake tangential force applied to the friction pad 18, and the friction pad 1 on the disc rotor 100 times entry side
8 A lifting force is generated at the end. 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 that intersects with the brake tangential force, the friction pad 18 itself is held by the second anchor portion 34R. It is also prevented from sliding along the engagement surface. 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, but (
(FIG. 2), a frictional force is generated by pressing the friction pad 18 against the disc rotor 10 by a braking operation.

As a result, due to the brake tangential force and rotational moment applied to the friction pad 18, the friction pad moves between the clearance with the support 12 in search of a fulcrum, and the stable points are set as anchor points A, B, and C, and the friction pad moves to the support point 12. In such a state, even if the force increases and the component parts are elastically deformed, the support relationship shown in FIG. 3 will not change and the component will follow the deformation. As a result, the friction pad 18 is held fixed, rotation around the anchor point is completely restricted, and vibration of the friction pad 18 is suppressed. Then, by releasing the force applied to the friction pad 18, the friction pad 18 returns to its floating state.

Furthermore, when the disc rotor 10 rotates in the opposite direction as shown by arrow B in FIG.
The second anchor portion 34L and the third anchor portion 36R on the right side function and exhibit similar actions and effects.

In the above embodiment, the engagement surfaces of the second anchor parts 34R and 34L are horizontal planes that are perpendicular to the engagement surfaces of the first anchor parts 32R and 32L, but this is the angle formed by the line passing through the anchor points A and B. It suffices if the engagement surface is an acute angle. Therefore, as shown in FIG. 4, it is sufficient to form the surface as a surface that opposes and supports the tangential force F generated on the third anchor part by the braking action, and the angle θ between the tangential force F and the engagement surface is an acute angle. If so, it will work fine. Also, the third anchor portion 36R, 3
Although the engagement surface of 6L is set in the radial direction of the disc rotor, it does not necessarily have to pass through the center of rotation O2 of the disc rotor IO.

〔Effect of the invention〕

As explained above, according to the present invention, the brake tangential force and moment applied to the friction pad are supported by the first anchor part and the third anchor part in the same body of the disc rotor, and on the rotation side of the disc rotor, the brake tangential force and moment are supported in the rotor radial direction. Since it is supported by the third anchor part along the axis, rotation around the anchor point is reliably regulated, vibration of the friction pad is suppressed, and brake noise and jug can be prevented. can get.

[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. FIG. 5 is an explanatory diagram of the forming angle of the engagement surface of the anchor portion, and is a cross-sectional configuration diagram of a friction pad support mechanism of a conventional disc brake. lO...Disc rotor, 12.Old...Support, 18...Friction pad, 26R, 26L...
...Engagement stepped portion, 28R, 28L...Shoulder portion,
32R, 32L...First anchor part, 34R, 3
4L...Third anchor part, 36R, 36L...
...Third anchor part. Agent Patent Attorney Tomo Murakami - Figure 2 Figure 3 Figure 4 Has Diagram

Claims (1)

[Claims] (1) Friction pads placed facing each other on both sides of the disc rotor are supported to be movable in the axial direction of the disc rotor, and a piston of a hydraulic actuator is provided on a caliper that straddles the disc rotor. In the disc brake which receives the braking force from the friction pad due to the operation of the disc rotor, an engagement stepped portion for transmitting the brake force is formed on the inner circumference of the friction pad on the side where the disc rotor enters, and the support includes a first anchor portion that locks the engagement step portion, and an engagement surface that faces the outer periphery of the friction pad on the disk rotor rotation side and is perpendicular to a plane that includes the rotor axis and the piston axis. and a friction pad support mechanism for a disc brake that receives a braking force from the friction pad along the radial direction of the disc rotor on the disc rotor rotation side.