JP2578841Y2 - Disc brake shim - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shim used for a disc brake and a disc brake effective for maintaining the function of the shim.

[0002]

2. Description of the Related Art In disc brakes, shims are frequently used as a measure against squeal during braking. A general type of the shim for preventing squeal is a flat thin plate.In order to enhance the effect of suppressing squeal, a bent portion in the disk axial direction is formed at the end of the rubber-coated shim in the tangential direction of the disk. In some cases, the portion is sandwiched between the side of the back plate (torque transmitting surface) of the pad and the torque receiving surface. Although this shim is also effective in preventing clonk noise, as shown in Japanese Utility Model Application Laid-Open No. 2-85035, the rubber coating layer is crushed by the braking torque and peeled off, so that the damping effect is early. It has the disadvantage of fading away.

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention is directed to a shim in which the so-called "shattering" of the cushioning material is reduced and peeling is reduced so that the damping effect can be maintained for a long time. The challenge is to provide

[0004]

Means for Solving the Problems The present invention shim to solve the aforementioned problem, (1) the disc tangential ends or
The entire structure including the bent portion in the axial direction of the disk provided at one end and sandwiched between the side surface of the pad back plate and the torque receiving surface is made of a material in which a cushioning material is integrally sandwiched between two metal plates.

[0005] As another form, (2) disk connection
Provide at both ends or one end in the line direction and
The entire structure including the bent portion sandwiched between the torque receiving surface and the torque receiving surface is constituted by a combination of a coating shim provided with a buffer material coating on the surface of a metal plate and a metal shim placed on the back side of the shim.
This latter shim may be more desirable if a lubricant is applied to at least one location between the pad back plate and the coating shim, the coating shim and the metal shim, or between the metal shim and the torque receiving surface.

In addition to employing this kind of shim, it is also effective to construct the brake itself so that the pressing force of the pressing member is distributed more to the ejecting side than to the disc entering side during forward movement. That is.

[0007]

In the shim adopting the structure of (1), the metal plate protects the cushioning material. That is, the cushioning material is often rubbed by the edge existing on the side of the back plate or the torque receiving surface of the pad and peeled off.

Since the shim of (1) has a metal plate, the surface sandwiching the shim does not directly hit the cushioning material, and the above-mentioned edge is not caught, so that the cushioning material hardly peels off. Further, in the case of the side-switch structure, the surface pressure generated during braking is dispersed outside the pressurized region and becomes small, so that the cushioning material is unlikely to set.

In the shim of (2), the coating on the side in contact with the metal shim of the coating shim is protected in the same manner as in the shim of (1), so that an effect which is not much different from that of (1) can be expected.

The lubricant desirably used in the shim (2) enhances the damping effect. This is known.

Next, in a normal disk brake, it is known that a rotational moment is generated in the pad during braking and the pad surface pressure on the disk reciprocating side increases. It is also empirically known that squeal is likely to occur when the pad surface pressure on the disk recirculation side is high.

Therefore, it is effective to distribute a large amount of pressing force applied to the pad to the disc feeding side during forward movement. That is,
By this pressing force distribution, the pad surface pressure on the inflow side decreases,
Squeal is less likely to occur during forward braking. On the other hand, due to the pressure distribution, during reverse braking, the pad surface pressure on the reverse entry side increases and squeal is likely to occur. A large pressure is not applied to the bent portion provided on the unwinding side (the rewinding side during forward movement). In addition, in this case, since it is not necessary to take measures against squealing at the time of forward movement, it is not necessary to protect the cushioning material or to provide the bending portion itself at the bent portion on the forward extension side. Almost no worries about smashing and peeling.

[0013]

1 and 2 show a first embodiment of a shim according to the present invention. This shim 10 is formed by bonding three members to each other with a buffer rubber 2 interposed between two metal plates 1 and 1 having a similar shape to the back plate of the pad. Of the back plate and the torque receiving surface 6 formed on the caliper 5
And a bent portion 11 in the axial direction of the disc inserted between the two.

FIG. 3 shows a shim of the second embodiment. This shim 20 is a combination of a coating shim 3 in which rubber 2 is coated on both sides of a metal plate 1 and a metal shim 4 placed on the back side of the shim 3, and the same bending as the former at both ends in the disk tangential direction. A part 21 is provided.

In these shims, the rubber sandwiched between the metal plates 1 and 1 or between the metal plate 1 and the metal shim 4 is protected by the plates on both sides and becomes difficult to peel off, so that the damping effect is maintained for a long time.
Note that the rubber protection effect can be obtained also at the contact portion such as the piston 7 shown in FIG.

FIG. 4 shows an example of the brake according to the present invention.
As described above, when the center O of the cylinder 8 provided on the caliper is offset from the center of the pad 9 in the forward rotation direction of the disk (the direction of the arrow in the drawing), the surface pressure of the pad decreases on the disk reciprocating side, and the forward braking time is reduced. The squeal stops. Accordingly, the shims 10 and 20 interposed between the piston 7 and the pad 9 need only be provided with the bent portions 11 and 21 only on the forward disc reciprocating side. Since the pressure is not so great, the protection effect of the rubber is further enhanced. The shim used for this brake is
A conventional rubber coat shim may be used.

[0017]

As described above, the shim of the present invention eliminates the direct contact of the pressing surface with the cushioning material to eliminate the scraping of the cushioning material by the edge of the surface, and at the same time, disperses the pressure applied to the cushioning material. In addition, the brake of the present invention protects the cushioning material by reducing the pressure applied to the cushioning material, so the damping effect of the shim does not weaken and the noise suppression function is long. It has the effect of being maintained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a shim of the present invention.

FIG. 2 is a diagram showing a use state of the same shim.

FIG. 3 is a sectional plan view showing another embodiment of the shim.

FIG. 4 is a plan view showing an example of the brake of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal plate 2 Rubber 3 Coating shim 4 Metal shim 5 Caliper 6 Torque receiving surface 7 Piston 8 Cylinder 9 Pad 10, 20 Shim 11, 21 Bent part

Continuation of front page (56) References JP-A-59-47536 (JP, A) JP-A-2-85035 (JP, U) JP-A-57-172940 (JP, U) JP-A-51-50179 (JP) , U) Japanese Utility Model Showa 63-1932 (JP, U) Japanese Utility Model Application Hei 2-78827 (JP, U) Japanese Utility Model Showa 62-45436 (JP, U) Japanese Patent Publication No. 48-9875 (JP, B1) (58) Field surveyed (Int.Cl. ⁶ , DB name) F16D 65/095 F16D 55/22

Claims (4)

(57) [Scope of request for utility model registration] 1. A squeal preventing shim interposed between a pad for slidingly contacting a disk and a member for pressing the same, wherein a side surface of a pad back plate and a torque receiving surface are provided at both ends or one end in a tangential direction of the disk. A disk brake shim having a bent portion in the axial direction of the disk sandwiched therebetween, and the entirety including the bent portion is made of a material in which a cushioning material is integrally held between two metal plates. 2. A pad to be brought into sliding contact with a disk and a pad
A squeak prevention shim interposed between
The back of the pad at both ends or one end in the tangential direction of the disc.
Between the side of the plate and the torque receiving surface.
A disk brake having a bent portion, and the entirety including the bent portion is composed of a combination of a coating shim provided with a cushioning material coating on the surface of a metal plate and a metal shim stacked on the back side of the shim. Sim. 3. The disk brake shim according to claim 2, wherein a lubricant is applied to at least one portion between the pad back plate and the coating shim, the coating shim and the metal shim, and between the metal shim and the torque receiving surface. 4. A squeal preventing shim having at least a side face of a pad back plate and a torque receiving
A bend in the axial direction of the disk is provided between the disk and the disk , and a shim provided with a cushioning material is used in the bend. Disc brakes that are distributed more to the exit side.