JPH0453467Y2 - - Google Patents

Description

[Detailed description of the invention] a. Purpose of the invention (industrial application field) The disc brake shim according to this invention is incorporated into a disc brake used for braking automobiles, and is intended to prevent the generation of noise during braking. It is something.

(Prior Art) Disc brakes are widely used for braking automobiles.

This disc brake, as shown in Figure 3,
A pair of pads 3, 3 are attached to the support 2, which is fixed to the vehicle body so as to straddle the outer peripheral edge of the rotor 1 that rotates with the wheels, with the rotor 1 in between, 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 in which the piston 5 is fitted to push the piston 5 to the left in FIG. (on the right side in Fig. 3; on the other hand, the outside of the vehicle is called the outer side) is pressed against 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 rotating together with the wheel 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 unavoidable that vibrations 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 support 2, the car body vibrates greatly and generates harsh noise. It ends up.

For this reason, conventionally, there has been a gap between the back surfaces of the back metals 8, 8 constituting 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.
It has been practiced to sandwich shims 7, 7 which have a damping effect.

The shims 7, 7 function to prevent the generation of harsh noise during braking by making it difficult for vibrations generated on the friction surface between the pads 3, 3 and the rotor 1 to be transmitted to the caliper 4 during braking. It is often made of thin plates such as stainless steel.

In addition, in order to further improve the noise prevention effect of such shims 7, 7, the above-mentioned back metals 8, 8 and shims 7, 7
Apply grease between the pads 3, 3 and shims 7, 7 to ensure smooth relative sliding between the pads 3, 3 and shims 7, 7, and prevent the generation of noise due to friction between the pads 3, 3 and shims 7, 7. There are also things being done.

(Problem that the invention aims to solve) However, in the conventional case, grease was simply applied between the shim 7 and the back metal 8 of the pad 3, so the durability of the grease was poor, and it was difficult to apply grease. The noise prevention effect associated with this did not last long.

In other words, the temperature of the pad 3 to which the shim 7 is attached rises due to frictional heat during braking, so the viscosity of the grease becomes extremely low, and if the pad 3 is simply coated with grease, the grease may wash away during braking. is unavoidable.

In addition, since dirt tends to adhere to the pad-attached area as the vehicle travels, this dirt tends to get mixed into the grease, and if it gets mixed in, the lubricity inherent to the grease can no longer be expected.

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

b. Structure of the invention (means for solving the problem) The disc brake shim of the invention consists of the first to second shims.
As shown in the figure, an intermediate plate 11 in which grease 9 is wrapped in a metal foil 10 into a thin plate shape, and two thin plates 12,
It is constituted by holding it between 12. In addition, in FIGS. 1 and 2, the dimension in the thickness direction is exaggerated compared to the dimensions in both directions, and the thickness dimension of the grease 9 is also depicted larger than the thickness dimension of the metal foil 10. .

As the metal foil 10, a material having plasticity, such as aluminum foil, stainless steel foil, or tin foil, is preferably used because it can easily wrap the grease 9.

Further, as the thin plates 12, 12, metal plates such as stainless steel plates, thin plates made of heat-resistant synthetic resin, etc. can be used.

(Function) The disc brake shim of the present invention configured as described above, like the conventional shim, is attached to the inner surface of the caliper pawl 4a or the end face of the piston 5 constituting the disc brake, and to the caliper pawl 4a. Alternatively, the pads 3, 3 are pressed against the side surface of the rotor 1 by the piston 5, and are held between the pads 3, 3 and the back metals 8, 8.

The disc brake shim of the present invention, which is configured as described above and used by being assembled into a disc brake as described above, has a function that prevents the generation of noise during braking compared to that of conventional shims. It is similar to

However, in the case of the disc brake shim of the present invention, if a relative shift occurs between the inner surface of the caliper pawl 4a or the end surface of the piston 5 and the pads 3, 3 during braking, the intermediate This is absorbed by the relative displacement of the thin plates 12, 12 with the plate 11 in between, and a strong frictional force acts between the inner surface of the caliper 4a or the end surface of the piston 5 and the shims 7, 7. This prevents the generation of harsh noises.

Intermediate plate 1 sandwiched between thin plates 12, 12
Since the grease 9 is wrapped around the thin plates 12 and 12, the displacement between the thin plates 12 and 12 is carried out smoothly, and a large frictional force that may cause noise is not generated between the thin plates 12 and 12. do not have.

Furthermore, since the grease 9 is wrapped in the metal foil 10, even if the temperature of the grease 9 rises due to braking, this grease 9 will not be washed away, and furthermore, dust will not adhere to the shim mounting area. Even in this case, this dust does not get mixed into the grease 9, and the lubricating effect of the grease 9 is maintained for a long period of time.

Furthermore, since the metal foil 10 is sandwiched between the two thin plates 12, 12, it will not be easily torn and the grease 9 wrapped therein will not be washed away.

c. Effects of the invention Since the disc brake shim of the invention is constructed and operates as described above, it can effectively prevent the generation of noise during braking of disc brakes, and furthermore, the noise prevention effect can be prolonged. It can be maintained over a period of time.

[Brief explanation of the drawing]

Figures 1 and 2 show the disc brake shim of the present invention. Figure 1 is a cross-sectional view showing the state attached to the back of the pad, and Figure 2 shows only the intermediate plate, and the dimensions in the thickness direction. The exaggerated sectional view, FIG. 3, is a sectional view of a disc brake equipped with shims. 1... Rotor, 2... Support, 3... Pad, 4... Caliper claw, 4a... Caliper claw, 5...
...Piston, 6...Cylinder, 7...Shim, 8...
...Backing metal, 9...Grease, 10...Metal foil, 11...
...Intermediate plate, 12...Thin plate.

Claims (1)

[Scope of utility model registration request] A shim for disc brakes that consists of a thin intermediate plate with grease wrapped in metal foil, which is sandwiched between two thin plates.