JPH0750596Y2 - Disc brake friction pad for vehicle - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction pad used for disc brakes of various traveling vehicles such as automobiles and motorcycles. More specifically, the invention relates to a friction pad for connecting a back plate and a lining. The present invention relates to a hole arrangement structure.

[0002]

2. Description of the Related Art Disc blurs for automobiles and motorcycles
The friction pad used for g is generally used with an adhesive to bond the lining and the back plate, and the protrusions of the lining are fitted into the multiple binding holes formed in the back plate to enhance the bonding strength between the two. ing.

When this friction pad is applied to the reaction part side of the caliper body, the binding hole of the back plate is, for example, the actual opening 53 against the bifurcated reaction force claw formed in the reaction part.
It is arranged as illustrated in FIG. Of these, the outer binding hole that partially overlaps the reaction force claw is
The center of the disc is arranged on the outer peripheral side of the disc from a cross direction line orthogonal to the disc radial direction line connecting the center of the caliper body and the center of the disc rotor at the center of the caliper body.

[0004]

In such a structure, the braking reaction force works to push back the tip side of the reaction force claw to the outside, so that the pad pushing force is stronger than the tip side of the reaction force claw. Due to the large effect on the base end side and the difference in peripheral speed between the inner and outer circumferences of the disk rotor, the outer circumference of the disk of the lining was worn earlier than other parts.

Therefore, in the present invention, by changing the position of the binding hole with respect to the reaction force claw of the reaction portion, the lining due to the deformation of the caliper body at the time of braking and the peripheral speed difference of the disc rotor is caused. It is an object of the present invention to provide a disc brake friction pad that prevents uneven wear as much as possible.

[0006]

According to the above object, the present invention provides a back plate of a friction pad which is pushed by a reaction claw of a caliper body with a binding hole for fitting a protrusion of a lining. In a friction pad of a vehicle disc brake, the entire binding hole is located in the reaction force claw, and the center of the binding hole and the center of a cylinder hole formed in the caliper body and the disc lock are connected to each other. A binding hole is arranged on a disk radial direction line connecting the center of the disk to a position closer to the inner circumferential side of the disk than an intersecting direction line orthogonal to the center of the cylinder hole.

[0007]

As described above, in the back plate portion that comes into contact with the reaction force claw, the binding hole having a lower rigidity than the back plate is moved toward the disc inner peripheral side with respect to the reaction force claw, and By securing a large area of the back plate that contacts the reaction force claws on the outer peripheral side of the disk, the pad pressing force received from the base end side of the reaction force claws is widely dispersed, and the surface pressure on the outer peripheral side of the disk can be suppressed low.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

The disk brake 1 is a disk rotor 2
A caliper bracket 3 fixed to the vehicle body at one side thereof supports a caliper body 4 via slide pins 5 and 5 so as to be movable in the disc axial direction. The caliper body 4 is
The disc rotor 2 includes an action portion 4a and a reaction portion 4b arranged on both sides of the disc rotor 2, and a bridge portion 4c for connecting the action portion 4a and the reaction portion 4b across the outside of the disc rotor 2. Action part 4
A cup-shaped piston 7 is inserted in a cylinder hole 6 provided on the side a of the disc rotor 2 on the side thereof, and bifurcated reaction force claws 4d and 4d are attached to the reaction portion 4b. It is provided toward the inner circumference side of the disc.

A pair of friction pads 8 are arranged between the acting portion 4a and the reaction portion 4b so as to sandwich the disc rotor 2 therebetween. Each friction pad 8 is composed of a lining 9 which is in sliding contact with the disc rotor 2 and a back plate 10 which is held by the caliper body 4, and has ear pieces 10a, 10a protruding from both sides of the back plate 10. , Caliper bracket 3
Of the disk is supported by the pad guide grooves 3b, 3b provided opposite to the torque receiving arms 3a, 3a via the pad retainer 11a, respectively, and the pad spring 11b is integrally provided with the pad retainer 11a. It has been erupted towards the center.

A hydraulic pressure chamber 12 is defined between the cylinder hole 6 and the piston 7, and the hydraulic pressure chamber 12 is an inlet port.
A brake hose (not shown) connected to the port 13 is connected to a known hydraulic master cylinder. When the hydraulic fluid pressurized by the hydraulic master cylinder is supplied to the hydraulic chamber 12, the piston 7 advances through the cylinder hole 6 and presses the one friction pad 8 against one side surface of the disc rotor 2. Next, due to this braking reaction force, the caliper body 4 acts on the action portion 4a.
In the direction, the reaction force claws 4d, 4d of the reaction portion 4b press the other friction pad 8 against the other side surface of the disc rotor 2 to perform a braking action. Of these, on the side of the reaction portion 4b, the pad pushing force is the reaction force claw 4d that contacts the back plate 10.
Is transmitted to the friction pad 8 through the area.

The back plate 10 of the friction pad 8 is provided with binding holes 10b, 10b for joining the lining 9, and the projections 9a, 9a of the lining 9 are provided in these binding holes 10b, 10b. Are joined together to increase the joint strength between them. The binding holes 10b and 10b are used for the disc brake 1
When assembled to, the entire binding hole 10b is the reaction force claw 4d.
A crossing direction that is perpendicular to the center O ₁ of the cylinder hole 6 and the disk radial line L ₁ connecting the center O ₁ of the cylinder hole 6 and the center (not shown) of the disk rotor 2 It is arranged so as to be located on the inner circumference side of the disc with respect to the line L ₂ (see FIG. 1).

By arranging the binding holes 10b as described above, in the back plate 10, a large area for contacting the reaction force claws 4d is secured on the disk outer peripheral side of each binding hole 10b, and the reaction force claws are secured. Since the pad pressing force received from the base end side of 4d is widely dispersed, the surface pressure on the outer peripheral side of the disk can be suppressed low. As a result, the caliper body 4 is deformed during braking, or uneven wear of the lining 9 due to the difference in peripheral speed between the inner and outer circumferences of the disc rotor 2 is prevented as much as possible.

In the above embodiment, the entire binding hole 10b is located on the inner side of the disk with respect to the line L ₂ in the intersecting direction. However, when uneven wear of the lining 9 is small, at least the binding hole 10b is formed. It is sufficient to dispose only the center O ₂ of the disk on the inner peripheral side of the disk as described above.

[0015]

As described above, according to the present invention, the binding hole provided on the back plate of the friction pad is entirely overlapped with the reaction force claw of the caliper body, and the center of the binding hole is centered on the caliper body and the disc. Arranged so as to be located on the disk inner peripheral side of the disk radial direction line connecting the center of the rotor with the intersecting direction line orthogonal to the center of the caliper body, and contact with the reaction force claw on the disk outer peripheral side of the back plate. By securing a large area for the pad, the pad pressing force received from the reaction force claw is widely dispersed and the surface pressure on the disk outer peripheral side is kept low, so the caliper body is deformed during braking and the disk rotor peripheral speed. Uneven wear of the lining due to the difference can be prevented as much as possible.

[Brief description of drawings]

FIG. 1 is a rear view of a disc brake showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

[Explanation of reference symbols] 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 4 ... Caliper body, 4a ... Working portion,
Reference numeral 4b ... Reaction portion, 4d ... Reaction force claw provided on the reaction portion 4b, 6 ... Cylinder hole, 8 ... Friction pad, 9 ... Lining, 9a ... Projection portion fitted into the binding hole 10b, 10 ... Back plate, 10b ... Binding hole, O ₁ ... Center of cylinder hole 6, O ₂
... center of Yuigiana 10b, the center O of L ₁ ...... cylinder bore 6
A disc radial direction line connecting ₁ and the center of the disc rotor ₂ , L ₂ ... A cross direction line orthogonal to the disc radial direction line L ₁ and the center O ₁ of the cylinder hole 6.

Claims (1)

[Scope of utility model registration request] 1. A friction pad for a vehicle disk brake, comprising a back plate of a friction pad pushed by a reaction force pawl of a caliper body and a binding hole for fitting a protrusion of a lining,
The entire binding hole is located in the reaction force claw, and the center of the binding hole is the radial line of the disc connecting the center of the cylinder hole formed in the caliper body and the center of the disc rotor. A friction pad for a vehicle disk brake, wherein a binding hole is arranged so as to be located on an inner peripheral side of the disk with respect to a line in a crossing direction orthogonal to each other at a center of the cylinder hole.