JPH061868U - Disc brake shim - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the shim from being dislodged from the pad by eliminating the deformation of the mounting claw part of the shim used for the disc brake. [Structure] The shim 10 is processed into a shape substantially similar to the pad 8b, and when the shim 10 has the claw portions a to d attached to the peripheral edge of the pad 8b, the shoulder portion e of the shim can engage with the pad guide portion 2c. And the other shoulder f is also processed to be engageable with the key member 14. As a result, the shim 10 can be maintained substantially stationary during braking.
The relative movement between the pad 8b and the shim 10 is limited, and the deformation of the claw portion is eliminated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc brake shim that is used for a disc brake of a vehicle or the like and that prevents abnormal noise due to vibration of a pad.

[0002]

[Prior art and its problems]

 In a disc brake that obtains a braking force by pressing the disc rotor with a pair of friction pads arranged on both sides of the disc or disc rotor, a brake lining is attached to prevent noise generation during braking. A shim is attached to the back of the pad, and Japanese Utility Model Publication No. 2-44111 discloses an example of the shim.

FIG. 4 shows a state in which a conventionally used disc brake shim 34 in such a disc brake 30 is attached to a pad 32. A plurality of claws 34a to 34d are integrally formed and held by engaging these claws 34a to 34b with the peripheral edge of the pad 32. With this structure, when the brake is actuated, the brake linings attached to the pair of pads 32 press the both sides of the disc rotor 31 that rotates with the wheels, and apply the braking force.

[0004]

[Problems to be solved by the device]

 However, when the braking torque becomes excessive, the pad receives a large force in the rotation direction of the disc rotor, and the pad moves by the amount of play of the pad. On the other hand, the shim is pinched by the piston and tries to stop at that position. That is, it tries to move relative to the pad. This relative movement is due to the fact that the shim sticks to the pad only when the pad is returned to its original position, such as when the brake is repeatedly braked and abruptly while the brake is operating, and the force of relative movement with the shim and It may be returned with the positional relationship maintained, and this is added by repeating the braking and sudden braking, resulting in relative movement beyond the play of the pad.If the added positional relationship and force increase, the shim's claw There is a problem that the part is deformed and a sufficient holding force cannot be obtained, or the part is deformed further and the shim comes off from the pad.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a disc brake shim that prevents deformation of the claw portion of the shim and prevents the shim from falling off.

[0006]

[Means for Solving the Problems]

 The purpose of the above is to interpose between the pad that is supported by the member that receives the braking torque and is movable in the axial direction of the disc, and the pressing mechanism that can press the pad against the disc, and engage with the peripheral edge of the pad. In the disc brake shim, which is formed with a claw portion that is held by the claw portion, is engageable with a member that receives the braking torque, and restricts relative movement with the pad. This is achieved by a disc brake shim provided with an engaging portion.

[0007]

[Action]

 Since the shim can be engaged with the member that receives the braking torque, the movement relative to the pad is restricted. As a result, the shims can be prevented from slipping off and the shims can be prevented from falling off due to deformation.

[0008]

【Example】

 Hereinafter, a disc brake shim according to an embodiment of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, a disc brake 1 as a main body includes a caliper body 2 and a cylinder portion 4, which are bolts 17 and 17 (they are in symmetrical positions, and only one of them is shown). Are fixed integrally. These have a publicly known internal structure, and the cylinder part 4 is integrally formed with an input mouthpiece 18 for receiving the hydraulic pressure from the master cylinder, and the piston in the cylinder part 4 receives the hydraulic pressure from this, The cylinder rotor slides in the axial direction of the disk rotor 3 that rotates with the wheels (the vertical direction of the paper surface in FIG. 2).

From the cylinder portion 4, arm portions 19 and 19 (at left-right symmetrical positions, only one of which is shown) for supporting the guide device portions 7a and 7b project. A guide shaft 20 is fitted to a tubular portion 19a formed at the tip of the arm portion 19 of each of the guide devices 7a and 7b. The guide shaft 20 is attached to the tubular portion 19a in the axial direction of the disc rotor 3. Is slidably guided by. The guide devices 7a and 7b are supported by bolts 24a and 24b by a bifurcated arm portion 25 fixed to the vehicle body side.

The caliper body 2 is arranged on both sides of the disc rotor 3 and straddles the brake linings 8a and 9a attached to the pads 8b and 9b, respectively. As shown in FIG. 1, the pad 8b has a concave portion 8d formed on one shoulder portion with a key member 14 having an L-shaped cross section interposed, and a concave portion 8c formed on the other shoulder portion. The disk rotor 3 is fitted in the portion 2c, a slight gap is formed between the disk rotor 3 and the disk rotor 3, and the disk rotor 3 is attached so as to be movable in the axial direction. Similarly to the pad 8b, the other pad 9b is also attached with the key member 14 and the pad guide portion 2c so as to be movable in the axial direction.

As shown in FIG. 2, a shim 11 according to the present invention is mounted between the piston of the cylinder portion 4 and the pad 9b behind the pad 9b, and the shim 10 is also provided behind the pad 8b on the outer side. Is attached. The shims 10 and 11 have the same shape, and only the outer side shim 10 will be described. As shown in FIG. 1, the shim 10 is processed into a shape similar to that of the pad 8b, and the shoulder portion e of the shim 10 is formed. , F have the same outer shape as the corresponding portions of the recesses 8c and 8d of the pad 8b. Therefore, the pad 8b and the shim 10 have the same play with respect to the pad guide portion 2c and the key member 14. Although the shims 10 and 11 are shown thick in FIG. 2 for the sake of clarity, they are actually thin metal plates of about 0.3 mm coated with rubber or resin.

FIG. 3 shows a state in which the shims 10, 11 (note that the symbols a, b, c, d in the shim 11 are different in left and right directions) are removed from the pads 8b, 9b. 11, a plurality of claws a to d are integrally formed by bending in a direction perpendicular to the plate surface. The positions of these claws a to d are when the shims 10 and 11 are overlapped on the pads 8b and 9b. , The claws a to d are processed so as to engage with the peripheral edges of the pads 8b and 9b. These claws a to d are held by sandwiching the peripheral edges of the pads 8b and 9b.

In FIGS. 1 and 2, the pad springs 21 and 22 fixed to the upper end are formed on the key member 14 by pressing the pads 8b and 9b against the pad guide portion 2c and the key member 14. A lock fitting 23 penetrating the formed hole is a stopper for preventing the key member 14 from coming off.

The disc brake shim of the present invention is constructed as described above. Next, its operation will be described.

By operating the brake pedal, the pressure liquid from the master cylinder is introduced into the cylinder 4 from the input mouthpiece 18, and the piston is driven in the axial direction of the disc rotor 3. As a result, the inner pad 9b axially slides the pad guide portion 2c and the key member 14 to be pressed against the disc rotor 3 with the shim 10 interposed. This reaction force causes the guide member 19 integrally formed with the caliper body 2 to slide on the guide shaft 20 fixed to the vehicle in the direction opposite to the movement of the piston, whereby the brake lining 8a on the outer side is removed. A braking force is obtained by pressing the disc rotor 3. At this time, the shims 10 and 11 suppress the resonance of the pads 8b and 9b to prevent the brake squeal.

During braking of the brake, the brake linings 8a and 9a press the disc rotor 3, so that the pads 8b and 9b receive a force in the rotation direction of the disc rotor 3 and move in the direction corresponding to the play. . The inner side shim 11 is clamped between the pad 9b and the piston, while the outer side shim 10 is also clamped between the frame of the caliper body 2 and the pad 8b. , Try to stop at that position. Next, when the brake is released, the pads 8b and 9b return to their original positions. At this time, the shims 10 and 11 try to follow the returning direction of the pads 8b and 9b. As explained in the conventional example, with the conventional shim configuration, the shim follows the pad's return direction while maintaining the relative movement amount relative to the pad during operation. And the relative movement of the shim became large, and the claws were deformed. On the other hand, in the present invention, since the shoulder portions e and f of the shims 10 and 11 can be engaged with the pad guide portion 2c of the caliper body 2 and the key member 14, the pads 8b and 9b and the shims 10 and 11 are formed. Relative movement with is restricted. As a result, even if the pads 8b and 9b try to return to their original positions while the pads 8b and 9b and the shims 10 and 11 are still relatively moved, the shims 10 and 11 are on the opposite side of the rotation direction of the disc rotor 3. The shoulder comes into contact with the pad guide portion 2c of the caliper body 2 and the key member 14 to return the relative positions of the pads 8b and 9b and the shims 10 and 11 to the original positions. The pads 8b and 9b and the shims 10 and 11 are not subjected to relative movement and force beyond the range of play, and these claws a to d are not deformed, and the shims 10 and 11 are removed from the pads 8b and 9b. It does not fall out.

As described above, the disc brake shim according to the embodiment of the present invention does not add the relative movements of the shims 10 and 11 and the pads 8a and 8b as described above. The claws of the shims 10 and 11 are not deformed, which prevents the shim from falling off the pad due to loss of holding force. Further, in order to limit the relative movement of the pad and the shim, it suffices that the peripheral edge of the shim be engageable with a part of the caliper body. It can be easily manufactured by molding without doing. Furthermore, the mounting is no different from the conventional one.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiments, when the shims 10 and 11 are attached to the pads 8b and 9b, the shims 10 and 11 are configured to be engageable with the pad guide portion 2c and the key member 14. The engageable portions of the shims 10 and 11 may have any shape or any position of the member to be damped, as long as the shim restricts relative movement with the pad.

[0021]

[Effect of device]

 As described above, according to the present invention, since the shim can be engaged with the member that receives the braking torque, the relative movement with the pad is limited, and the deformation of the claw portion of the shim that engages with the peripheral edge of the pad is limited. This reduces the force held against the pad and prevents the shim from falling off.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a disc brake shim attached to a pad according to an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a perspective view showing the shim removed from the pad.

FIG. 4 is a partially cutaway front view showing a conventional shim attached to a pad.

[Explanation of symbols]

 2 Caliper body 3 Disc rotor 8b Pad 9b Pad 10 Shim 11 Shim a Claw b Claw c Claw d Claw e Shoulder f Shoulder

Claims (1)

[Scope of utility model registration request] 1. A pad, which is supported by a member that receives a braking torque and is movable in the axial direction of a disk, and a pressing mechanism that can press the pad against the disk, and engages with the peripheral edge of the pad. In a disc brake shim, which is formed with a claw portion for holding the pad with the claw portion, is engageable with a member that receives the braking torque, and restricts relative movement with the pad. A disc brake shim with an engaging portion.