JPH04105642U - Friction pads for vehicle disc brakes - Google Patents

Abstract

(57) [Summary] [Purpose] To increase the bonding strength between the back plate and the lining. To reduce the width of a joint between a binding hole in a back plate and a lining projection, and to suppress an increase in the number of joints to prevent bending loads from being applied to reaction claws of a piston or a caliper. [Structure] The protrusions 11a, 1 of the lining 11 are attached to the back plate 12.
1a into which the disc rotor 2 is inserted, between the piston 8 and the reaction claws 5e, 5e.
The binding hole 12b and the protrusion 11a are arranged in the radial direction, that is, in the radial direction centering on the rotation fulcrum O of the disc rotor 2
A straight line portion E on the side of the fitting portion is made perpendicular to the rotational direction A of the disc rotor 2.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a friction pad for disc brakes installed in various types of vehicles. In particular, it relates to the joint structure between the lining and the back plate.

0002

[Conventional technology]

In general, disc brakes installed on four-wheeled vehicles and motorcycles are shown in Figure 4. A friction pad as shown is used. This friction pad 20 rubs against the disc rotor. The contacting lining 21 is bonded to a rigid backing plate 22 such as a steel plate with adhesive. The binding hole 22a of the back plate 22 and the protrusion 21a of the lining 21 are fitted together. The bonding strength is further increased by bonding, and it easily peels off due to braking torque and braking heat during sliding contact. (For example, Figure 1 and (see Figure 2).

0003 The protrusion 21a of the lining 21 is formed when the lining 21 is temporarily formed before joining. is integrally formed during temporary molding and fitted into the binding hole 22a when bonded to the back plate 22, In addition, when a powder lining material is directly pressure molded onto the back plate 22 and bonded to the back plate 22. At the same time, a part of the lining material that protrudes into the binding hole 22a during pressure molding is removed. It is pressurized and fitted into the binding hole 22a.

0004

[Problem that the idea aims to solve]

By the way, with the development of high-performance vehicles in recent years, disc brakes are also becoming more powerful. As a result, friction pads tend to become longer and larger in the circumferential direction of the disk. This way As the friction pad becomes larger, it will cause damage to the lining 21 due to sliding contact with the disc rotor. The braking torque generated is also large, and this braking torque is applied to the protrusion 21a and the binding hole 2. Since shearing force is applied to the fitting part with 2a, the number of fitting parts has been reduced to two sets, for example, in the past. It is necessary to increase the number of pairs from 1 to 4 or 6 to increase the bonding strength.

[0005] However, since the above-mentioned binding hole 22a and protrusion 21a are generally circular, the disc When braking torque B is applied from rotation direction A of the rotor, braking torque B is mainly At two points, C on the insertion side and D on the output side, which are perpendicular to this, draw a line across the fitting depth of both. Even if the number of mating parts is increased, the bonding strength will not be increased too much. It didn't happen.

[0006] In addition, when the number of fitting parts is increased in this way, the piston that pushes the friction pad 20 The pushing force of the piston and reaction claw overlaps with the reaction force claw of the piston and caliper, and the protrusion 21a A bending load acts on the fitting part with the binding hole 22a, weakening the bonding force and causing the lining to This may cause the 21 and the back plate 22 to separate.

[0007] This invention was developed in view of these circumstances, and its purpose is to , a friction pad that increases the bonding strength without increasing the number of mating parts. The purpose is to provide a bonding structure.

[0008]

[Means to solve the problem]

In accordance with the above-mentioned purpose, the present invention provides a backing plate that is joined to the lining. A friction pad for a vehicle disc brake that has a binding hole that accommodates a portion of the friction pad. The binding hole is formed in a long hole shape and arranged in the radial direction of the disc rotor. It is characterized by the following.

[0009]

[Effect]

According to this configuration, the binding holes of the back plate are arranged in a direction perpendicular to the rotation of the disc rotor. The braking torque is applied in the disc radial direction of the fitting part between the binding hole and the protrusion x both sides. Since it is supported in terms of the depth of the mating part, high coupling can be achieved without increasing the number of mating parts. Provides adhesion strength. In addition, the width of the mating part in the disk circumferential direction is narrow, and the piston This makes it easier to avoid polymerization with the reaction claws.

0010

【Example】 Hereinafter, one embodiment of the present invention will be described based on the drawings.

[0011] The disc brake 1 includes a disc rotor 2 that rotates together with the wheel in the direction of arrow A. , a caliper bracket 3 fixed to the vehicle body on one side of the disc rotor 2, and a caliper bracket 3 fixed to the vehicle body on one side of the disc rotor 2. a pair of support arms 3a extending from the liper bracket 3 to the outside of the disc rotor 2; 3a, a key supported movably in the disk axial direction via slide pins 4, 4. I have a Charipa body 5.

0012 The caliper body 5 has working parts 5a disposed on both sides of the disc rotor 2. The reaction part 5b is connected to a bridge that straddles the outside of the disc rotor 2 between the support arms 3a, 3a. The slide pins 4 protrude from both sides of the action part 5a. The mounting arms 5d, 5d are fixed to the tips of the mounting arms 5d, respectively, with bolts 6, and the supporting arms 3a It is slidably inserted into the pin hole 3b drilled in the. The action part 5a has a cylinder hole. 7 is provided with an opening on the disc rotor side, and a reaction claw 5e is provided in the reaction portion 5b. , 5e are provided on both sides of the cylinder hole 7, and the cylinder hole 7 has A cup-shaped piston that moves forward in two directions around the disc rotor using hydraulic pressure supplied to the bottom. 8 is fluid-tightly and movably inserted.

[0013] A pair of friction pads 10, 10 are provided between the acting part 5a and the reaction part 5b. They are arranged opposite to each other with the scroller 2 in between. This friction pad 10 has a lining 11 and the back plate 12 are joined, and the tabs 12a protrude from both sides of the back plate 12, 12a, step-shaped pad receiving parts 3c, 3 facing inside of the support arms 3a, 3a. c, and is suspended so as to be movable in the axial direction of the disk.

[0014] One of these friction pads 10, 10 on the acting part 5a side is connected to the piston 8, and the other side is connected to the piston 8. The other side on the action part 5b side is the reaction claw 5e of the caliper body 5 that moves toward the action part 5a side. , 5e, are pushed toward the disc rotor 2 side, and both sides of the disc rotor 2 A braking action is performed by clamping the surfaces between the linings 11, 11.

[0015] Each back plate 12 has binding holes 12 for accommodating the protrusions 11a, 11a of the lining 11. b, 12b are bored in an oval shape, and are suitable for joining with the lining 11 and the back plate 12. In this case, application of adhesive and fitting of the binding hole 12b and the protrusion 11a are used together.

[0016] As described above, the protrusion 11a is formed when the lining 11 is temporarily formed before joining. It is formed integrally with the lining 11 during temporary molding, and the binding hole 12b is formed when joining the back plate 12. The powder lining material is directly press-molded onto the back plate 12 to form the powder lining material onto the back plate 12. When joining, the lining material that protrudes into the binding hole 12b during pressure molding is The protrusion 11 of this embodiment is fitted into the binding hole 12b by applying pressure to a portion of the protrusion 11 at the same time. a is formed into a protrusion that is oval in shape and has the same height as the thickness of the back plate 12. ing.

[0017] These two sets of fitting portions are provided between the piston 8 and the reaction claws 5e, 5e. The radial direction of the rotor 2, that is, the radial direction centered on the rotation fulcrum O of the disc rotor 2 The straight parts E and E on both sides are arranged in the direction A of the disc rotor 2. oriented orthogonally. Due to this orientation, the side of the binding hole 12b and the protrusion 11a The surface, that is, the surface formed by the linear portion E x the fitting depth F between the binding hole 12b and the protrusion 11a, is The direction of rotation is oriented perpendicular to the rotation direction A of the disc rotor 2. As with Direction A, a large area is applied to the braking torque B that acts from the circumferential direction of the disc rotor 2. The coupling strength between the binding hole 12b and the protrusion 11a against the braking torque B is increased by making them face each other. I'm looking forward to it.

[0018] This embodiment is configured as described above, and the braking operation is performed as described above. , the braking torque B generated in the lining 11 due to the sliding contact with the disc rotor 2 causes the binding When applied to the fitting portion between the hole 12b and the protrusion 11a, the braking torque B is Due to the wide area of the straight line portion E on both sides of the mating part x its mating depth F, Since it is supported, the braking torque B applied per unit area is distributed and extremely small. (See Figure 2). Therefore, even for long-term use, the lining 11 and back plate 1 There is no risk of separation between the two and the brakes, and it is fully compatible with recent high-output disc brakes. can do.

[0019] Furthermore, by forming the binding hole 12b to be elongated in the radial direction of the disk, it is possible to Since the necessary area is secured in the disk radial direction, the binding hole 12b and the protrusion 11a Since the width can be narrowed and the number of these combinations can be reduced, it is possible to As in the example, overlapping with the piston 8 and reaction claws 5e and 5e can be avoided. This eliminates the need for bending loads due to the pushing of the piston 8 and reaction claws 5e, 5e. Therefore, peeling can be further prevented.

[0020]

[Effect of the idea]

As described above, in the friction pad of the present invention, the binding holes of the back plate are formed into elongated holes. Since it is arranged in the radial direction of the scroller, the connection between the fitting hole and the lining protrusion is The bonding strength is increased, there is no risk of peeling off even after long-term use, and the high output power of recent years is improved. It is also fully compatible with disc brakes.

[0021] In addition, since the width of the fitting part can be narrowed and the number of fitting parts can be reduced, the piston It is possible to avoid overlapping with the piston and reaction claw, and the bending load caused by the piston and reaction claw can be avoided on the mating part. The effect is eliminated, and peeling of the lining and backing plate can be further prevented.

[Brief explanation of drawings]

[Figure 1] I-I sectional view in Figure 3

[Figure 2] Enlarged view of main parts of Figure 1

[Fig. 3] Partial cross-sectional plan view of a disc brake showing an embodiment of the present invention

[Figure 4] Rear view of conventional friction pad

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Disc brake, 2... Disc rotor, 5... Caliper body, 5a... Action part, 5b... Reaction part, 5e... Reaction claw, 8... Piston, 10... Friction pad, 11... Lining, 11a... Projection, 12... Back plate, 12a... Ledge piece, 12
b... Binding hole, A... Rotation direction of disc rotor 2, B... Braking torque, E... Straight line portion on both sides of binding hole 12b and protrusion 11a, F... Connection between binding hole 12b and protrusion 11a. Mating depth, O
...Rotation fulcrum of disc rotor 2

Claims (1)

[Scope of utility model registration request] 1. A friction pad for a disc brake for a vehicle, in which a binding hole for accommodating a part of the lining is formed in a back plate to be joined to the lining, wherein the binding hole is shaped like a long hole. A friction pad for a vehicle disc brake, characterized in that it is formed and arranged in the radial direction of a disc rotor.