JPH0354980Y2 - - Google Patents

Description

[Detailed explanation of the invention] a. Purpose of the invention (industrial application field) The shim plate for disc brakes according to this invention is:
It is incorporated into disc brakes used for braking automobiles, and prevents the generation of noise during braking.

(Prior Art) Disc brakes are widely used to brake automobiles.

This disc brake, as shown in Figure 9,
A pair of pads 3, 3 are attached to a support 2 fixed to the vehicle body so as to sandwich the outer peripheral edge of a rotor 1 that rotates with the wheels, and a pair of pads 3, 3 are attached to the support 2, sandwiching the rotor 1 therebetween, so that the support 2 can be moved slightly. Braking is performed by the action of a piston 5 built into a supported caliper 4.

When braking, pressurized oil is supplied into the cylinder 6 into which the piston 5 is fitted to push the piston 5 to the left in FIG. (This is the right side in Fig. 9.On the other hand, the outside of the vehicle is called the outer side.) Press the pad 3 on the inside surface of the rotor 1.

As a reaction to the pressing of the inner pad 3 against the inner surface of the rotor 1, the caliper 4 provided with the piston 5 moves to the right in FIG. presses the outer pad 3 against the outer surface of the rotor 1.

As a result, the rotor 1, which rotates with the vehicle, is strongly clamped from both the inner and outer sides, and braking is performed based on the friction between the inner and outer surfaces of the rotor 1 and the pads 3, 3.

A disc brake used for braking a car is constructed and operates as described above, but during braking, based on the friction between the pads 3, 3 and the rotor 1,
It is inevitable that vibrations will occur on the friction surfaces, and when the vibrations generated on the friction surfaces are transmitted to the car body through the caliper 4 and the support 2, the car body will vibrate greatly and produce harsh noise. It ends up.

For this reason, conventionally, shim plates 7, 7 having a damping effect are sandwiched between the back surfaces of both the outer and inner pads 3, 3 and the inner surface of the caliper pawl 4a or the end surface of the piston 5. was being carried out.

The shim plates 7, 7 are usually made of an elastic material such as rubber, and prevent the vibration generated on the friction surface between the pads 3, 3 and the rotor 1 during braking from being transmitted to the caliper 4. It functions in such a way that no harsh noise is generated.

(Problems to be Solved by the Invention) However, the disc brake constructed and operated as described above has conventionally had the following disadvantages.

That is, as the piston 5 built into the caliper 4 is pushed out, a pair of pads 3, 3 are inserted between the end surface of the piston 5 and the inner surface of the caliper pawl 4a.
When the rotor 1 is strongly pressed against both the front and back surfaces, the caliper 4 is deformed as shown in an exaggerated manner in FIG.
The distance between a and the inner surface of the rotor 1 is wide near the outer periphery of the rotor 1, and becomes narrower near the inner periphery of the rotor 1.

If the distance between the end surface of the piston 5 and the inner surface of the caliper pawl 4a becomes uneven as the caliper 4 deforms in this way, the piston may be pinched between the inside surface of the caliper pawl 4a and the back surface of the pad 3. As shown in FIG. 11, the force for pressing the shim plate 7 is large at the outer periphery (the upper part in FIG. 11) and becomes smaller at the inner periphery (the lower part).

The difference in the force for pressing the shim plate 7 becomes considerably large between the inner circumferential side and the outer circumferential side, and the outer circumferential side of the shim plate 7 receives an excessive compressive load, resulting in insufficient durability.
In addition, since there is a difference in the pressing force of the outer pad 3 that is pressed against the side surface of the rotor 1 via the shim plate 7 between the outer circumferential side and the inner circumferential side, the amount of wear of the friction material of this pad 3 varies depending on the amount of wear on the outer circumferential side. So-called uneven wear occurs, where unevenness occurs between the inner circumferential side and the inner circumferential side.

The disc brake shim plate of the present invention prevents the above-mentioned disadvantages.

b. Structure of the invention (means for solving problems) The disc brake shim plate of the invention, like the conventional disc brake shim plate described above, has a caliper pawl that constitutes the disc brake, and a caliper pawl attached to the caliper pawl. Therefore, it is used by being held between a pad that is pressed against the side of the rotor.

In the disc brake shim plate of the present invention, a rod is provided over almost the entire length of the shim plate at a position that bisects the shim plate into an inner portion and an outer portion in the radial direction of the rotor.

Furthermore, a shim plate body made of an elastic material is connected to the inside and outside of the rod in the radial direction of the rotor.

(Function) The disc brake shim plate of the present invention constructed as described above is held between the caliper pawl that constitutes the disc brake and the pad that is pressed against the side surface of the rotor by the caliper pawl. When used, the force with which the pad is pressed against the side surface of the rotor through the shim plate is strongest at the bar in the center of the shim plate, and becomes weaker as it moves away from the bar.

If the caliper is deformed during braking, the pressing force on the outer part of the rod will be greater than the pressing force on the inner part, but the difference in pressing force between the two parts will be smaller than before, and the shim plate will This prevents the durability of the rotor from becoming extremely short, and from causing significant uneven wear on the wear material of the pad that is pressed against the side surface of the rotor via the shim plate.

(Example) Next, the present invention will be explained in more detail by explaining the illustrated embodiment.

Figures 1 to 3 show the first embodiment of the present invention, Figure 1 is a front view showing the rod attached to the back of the pad, and Figure 2 is a sectional view taken along line A-A in Figure 1. ,
FIG. 3 is an enlarged view of section B in FIG.

Steel, stainless steel,
A rod 8 having a circular cross section and made of a rigid material such as an aluminum alloy is provided over almost the entire length of the shim plate 7. More preferably, this rod 8 is made of a material having vibration-proofing properties.

Shim plate bodies 9, 9 made of an elastic material such as rubber are connected to the inside and outside of this rod 8. The thickness of the shim plate bodies 9 and the outer diameter of the rod 8 are made equal to each other, and both the front and back surfaces of the shim plate 7 are made flat over their entire surface.

The disc brake shim plate of the present invention constructed as described above is similar to the conventional shim board described above, as shown in FIG. It is used by being held between the pad 3 which is pressed against the outer surface of the rotor 1 by the caliper claw 4a.

When the shim plate 7 of the present invention is assembled to a disc brake as described above for braking, the shim plate 7
As shown in FIG. 4, the force with which the pad 3 is pressed against the side surface of the rotor 1 is strongest at the rod 8 provided at the center of the shim plate 7, and increases as the distance from the rod 8 increases. become weak.

i.e. steel stainless steel, aluminum alloy, etc.
As shown in FIG. 4, the pressing force at the portion where the rod body 8 made of a material that has damping properties but is not elastically deformable is aligned with the shim plate body 9 made of an elastically deformable material such as rubber, The pressing force of the portion aligned with the shim bodies 9 is larger than that of the portion aligned with the shim body 9, and the pressing force of the portion aligned with the shim body 9 is larger as the portion is closer to the rod 8, and becomes smaller as the portion is farther from the rod 8.

During braking, as the piston 5 is pushed out, the caliper 4 is deformed as shown in an exaggerated manner in FIG.
If the distance between the end surface of the piston 5 and the inner surface of the caliper pawl 4a is wide at the outer circumferential portion of the rotor 1 and narrower at the inner circumferential portion, the pressing force at the outer circumferential portion is greater than that of the rod 8 at the inner circumferential portion. However, the difference in the pressing force between the two parts is smaller than before, and the durability of the shim plate 7 may be extremely shortened, or the rotor 1 may be damaged through the shim plate 7. Significant uneven wear will not occur in the friction material of the pad 3 pressed against the side surface.

In addition, in the first embodiment described above, the shim plate 7
Although the cross-sectional shape of the rod 8 provided at the center of the rod 8 is circular, the cross-sectional shape of the rod 8 is not limited to this, and may be rectangular as in the second embodiment shown in FIG. You can also do it.

Further, the shim plate bodies 9, 9 may be made of only an elastic material such as rubber as in the first and second embodiments, but as shown in FIGS. If both the front and back sides are covered with thin plates 11, 11 made of stainless steel or the like, the shim plate body 9, 9 will be unnecessarily deformed, making it difficult to handle the shim plate 7 before installing it on the disc brake. Things can be prevented. The thin plate 1 may be sandwiched between two elastic members 10, 10, as shown in FIG.

c. Effects of the present invention The disc brake shim plate of the present invention is configured and operates as described above, so it reduces the unevenness of the pressing force applied to the shim plate and improves the durability of the shim plate. It has great practical effects, such as preventing uneven wear of the friction material of the pads.

[Brief explanation of the drawing]

Figures 1 to 3 show the first embodiment of the present invention, Figure 1 is a front view showing the state in which it is attached to the back of the pad, Figure 2 is a sectional view taken along line AA in Figure 1, and Figure 3 is a cross-sectional view taken along line A-A in Figure 1. The figure is an enlarged view of part B in Figure 2, Figure 4 is a diagram showing the strength of the pressing force applied to this shim plate during braking, and Figures 5 to 8 are second to fifth embodiments of the shim plate of the present invention. 3rd showing
Figure 9 is a sectional view of the disc brake, Figure 10 is an exaggerated view of the deformation of the caliper during braking, and Figure 11 is a diagram showing the pressing force applied to the shim plate when the caliper is deformed. It is a diagram showing strength. 1: Rotor, 2: Support, 3: Pad, 4:
Caliper, 4a: Caliper claw, 5: Piston,
6: cylinder, 7: shim plate, 8: rod, 9: shim plate body, 10: elastic body, 11: thin plate.

Claims (1)

[Scope of utility model registration request] A shim plate for a disc brake that is held between a caliper pawl that constitutes a disc brake and a pad that is pressed against the side surface of the rotor by the caliper pawl, and the shim plate is attached to the radially inner part of the rotor. A rod body is provided over almost the entire length of the shim plate at a position where the shim plate is divided into two parts, and a shim plate body made of an elastic material is connected to the inside and outside of the rod body in the radial direction of the rotor. , shim plate for disc brakes.