JPH017865Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a brake friction device that presses against the friction surface of a rotating member to suppress the rotation of the rotating member.
In particular, the present invention relates to a friction device that prevents adhesive protruding from between a friction material and a holding device to which the friction material is bonded from hitting the friction surface of a rotating member.

BACKGROUND TECHNOLOGY A device includes a plate-shaped friction material and a holding member to which the friction material is attached with an adhesive, and presses the friction material against the friction surface of a rotating rotating member to suppress rotation of the rotating member. There is a brake friction device. For example, in automobile brakes, this applies to parts of brake shoe assemblies for drum brakes, friction pads for disc brakes, and the like. When manufacturing such friction devices, it is difficult to apply the required amount of adhesive accurately and uniformly, and the required amount varies depending on the surface properties of the friction material. Generally, a sufficient amount of adhesive is used to absorb variations in the amount of adhesive applied and the required amount.

Problems to be Solved by the Invention However, according to the conventional friction device manufactured by such a method, when the friction material is adhered to the holding member, excess adhesive may cause the friction material and the holding member to stick together. There was a drawback that it was pushed out from the surface and climbed up the side end surface of the friction material. That is, for example, when the friction device is a brake shoe assembly, the adhesive 6 applied to one or both of the opposing surfaces of the shoe rim 2 and the friction material 4, as shown in FIG. When pasting, use Shurim 2
When the and friction material 4 are pressed together, the excess adhesive 6 is pushed out from the attachment surface and accumulates in the corner between the edge of the seal rim 2 and the side end surface of the friction material 4. It is hardened. For this reason, the adhesive 6 that has climbed up the side end surface of the friction material 4 and hardened comes into contact with the friction surface of the brake drum as the friction material 4 wears, so that the adhesive 6 and the friction surface of the brake drum are Due to the sliding contact, the coefficient of friction with the friction surface of the brake drum fluctuates, resulting in a change in braking sensation.

On the other hand, as described in Japanese Utility Model Application No. 52-168187, for example, if recesses are formed at predetermined intervals in the longitudinal direction on both edges in the width direction of the attachment surface of the Syu-rim, the Since the adhesive flows into the recesses, it is thought that the adhesive can be prevented from creeping up the side end surface of the friction material. This ensures that the adhesive that protrudes from between the friction material and the area where the recess is not provided on both widthwise edges of the side to which Syurim is attached is prevented from creeping up to the side edge surface of the friction material. It is difficult to do so.

The present invention was developed against the background of the above circumstances, and its purpose is to provide a brake that prevents the adhesive for attaching the friction material to the holding member from coming into contact with the friction surface of the rotating member. The purpose of this invention is to provide a friction device.

Means for Solving the Problems In order to achieve the above object, the gist of the present invention is to place a friction material on the attachment surface of the holding member to which the friction material is attached, at a position facing the outer peripheral edge of the friction material. It extends along the outer peripheral edge of the friction material, and when the friction material is pressed against the attachment surface of the holding member through the adhesive, the adhesive that protrudes from between the friction material and the attachment surface of the holding member. This is because an adhesive reservoir recess capable of accommodating a surplus amount is provided.

Operation and Effect of the Invention By doing this, when the friction material and the holding member are pressed against each other via the adhesive, the outer periphery of the friction material is located at the position opposite to the outer periphery of the friction material on the attachment surface of the holding member. The excess amount of adhesive that protrudes from between the holding member and the friction material can be stored in the adhesive reservoir provided so as to extend along the surface of the friction material. This makes it possible to suitably prevent fluctuations in the coefficient of friction between the rotating member and the friction material and changes in braking sensation caused by the adhesive creeping up on the side end surfaces of the friction material.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

In FIG. 1, reference numeral 10 denotes a shoe assembly used for drum brakes, one end of which is brought into contact with an anchor 12, and the other end is brought into contact with a wheel cylinder 14. As it operates, it is pressed against a friction surface that is the inner peripheral surface of a brake drum (not shown) that serves as a rotating member. In addition, 16 is a return spring, and 18 is a brake shoe assembly 10 attached to a bucking plate (not shown).
It is a shoe hold-down that supports movably.

The brake shoe assembly 10 is equipped with a brake shoe 24 consisting of an arcuate shoe web 20 and a curved band-shaped shoe rim 22 fixed to the outer peripheral edge of the shoe web 20 at right angles to the shoe web 20. A well-known band-shaped friction material 26 is adhered to the outer circumferential surface of the rim 22 as a holding member with an adhesive 28. As shown in FIG. 2, both end edges in the width direction of the shoot rim 22 are bent toward the shoot web 20 side (inner peripheral side) along the longitudinal direction, so that the shoot rim 22 covered with the friction material 26 A recess is formed in a direction facing away from the friction material 26 at a position facing both widthwise edges (outer periphery) of the friction material 26 on the attachment surface of the friction material 26 , and along the widthwise both edges of the friction material 26 . extending in the direction of
Longitudinal spaces 30 are formed that open outward on both sides in the width direction of the rim 22. This empty space 3
0 corresponds to the adhesive reservoir recess of this embodiment. Therefore, the adhesive 28 pushed out from between the rim 22 and the friction material 26 is accumulated in the space 30 before reaching the side end surface of the friction material 26, so that the adhesive 28 is
8, the creeping up of the friction material 26 onto the side end surface is completely eliminated.

That is, variations and non-uniformity in the amount of adhesive 28 applied to the inner circumferential surface of the friction material 26 and/or the outer circumferential surface of the rim 22 opposite to the inner circumferential surface of the friction material 26, and Since variations in the required amount of application due to the properties of the surrounding surface are unavoidable, a sufficient amount of adhesive 28 is applied to absorb such variations in order to obtain sufficient adhesive strength.
When the friction material 26 is pressed against the seal rim 22, it is inevitable that the adhesive 28 will protrude from the surface to which it is attached. However, according to the present embodiment, the friction material 26 is placed at a position facing both widthwise side edges of the friction material 26 on the attachment surface of the rim 22.
Since a space 30 extending in the longitudinal direction is formed along both edges in the width direction, the adhesive 2 that protrudes
8 is surely stored in the cavity 30 before reaching the side end surface of the friction material 26. The volume of the space 30 is formed to be large enough to accommodate even the maximum variation in the amount of adhesive extruding. Therefore, fluctuations in the coefficient of friction with the brake drum and changes in braking sensation caused by the adhesive 28 creeping up onto the side end surfaces of the friction material 26 and hardening can be easily prevented.

Next, another embodiment of the present invention will be described.
In the following description, parts common to those in the above-mentioned embodiments are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 3, grooves 32 are formed along the longitudinal direction at both ends of the rim 22 in the width direction.
The rim 2 whose groove 32 faces the friction material 26
A part of the attachment surface of No. 2 is recessed to form an adhesive reservoir recess. According to this embodiment, since the grooves 32 are not opened laterally, there is an advantage that even adhesive having relatively low viscosity can be reliably stored in the grooves 32.

Although the embodiment of the present invention has been described above based on the drawings, the present invention can also be applied to other aspects.

For example, in the embodiment described above, the friction material 26 is fixed to the rim 22 by an adhesive 28, but rivets may also be used.

Further, in the above-mentioned embodiments, a brake shoe assembly for a drum brake has been described, but the present invention is also applicable to a friction pad for a disc brake. In this case, the backing metal to which the friction material is adhered by adhesive forms the holding member.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating the configuration of a drum brake including an embodiment of the present invention. Figure 2 shows the first
FIG. FIG. 3 is a diagram showing another embodiment of the present invention, and corresponds to FIG. 2. FIG. 4 is a diagram showing a conventional brake shoe, and corresponds to FIG. 2. 10: Brake shoe assembly (friction device), 22: Shoe rim (holding member), 24: Brake shoe, 26: Friction material, 28: Adhesive, {3
0: void, 32: groove} (adhesive reservoir recess).

Claims (1)

[Claims for Utility Model Registration] Comprising a plate-shaped friction material and a holding member to which the friction material is attached with an adhesive, the friction material is pressed against the friction surface of a rotating rotating member to rotate the rotating member. In a brake friction device that suppresses rotation of a member, a bonding member is provided along the outer circumferential edge of the friction material at a position facing the outer circumferential edge of the friction material on the attachment surface of the holding member to which the friction material is attached. an adhesive that extends along the adhesive and can accommodate an excess amount of adhesive that protrudes from between the friction material and the attachment surface of the holding member when the friction material is pressed against the attachment surface of the holding member through the adhesive; A brake friction device characterized by having a reservoir recess.