JPS642999Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a disc brake widely used in automobiles and the like.

Generally, in a disc brake, water flows into the cylinder through an opening in a cylinder formed in a caliper that straddles the outer periphery of the rotor, and on the outer peripheral surface of the outer end of a piston that is slidably assembled in the cylinder in the axial direction.
A boot is provided to prevent dust from entering the piston, and a shim is provided between the outer end surface of the piston and the back metal of the pad facing the piston to prevent brake squeal during braking. However, the above-mentioned boots may suffer from heat damage (burning, sagging, etc.) due to heat from the rotor heated by braking. In some disc brakes, the above-mentioned shim is directly attached to the piston in a removable manner in the sliding direction thereof. However, although this disc brake has the advantages that the shim is easy to assemble and the pads can be assembled and replaced while the shim is attached to the piston, the shim attached to the piston is When setting pads on the front of (or vice versa)
In this case, it is necessary to move the shim and pad relative to each other in a direction substantially perpendicular to the sliding direction of the piston (radial direction of the rotor), and the outer periphery of the boot may be damaged by the back metal of the pad.

The present invention attempts to solve this problem by effectively utilizing shims, and one embodiment thereof will be described below with reference to the drawings.

1 to 3 show a disc brake according to the present invention. In this disc brake, an inner pad 11 and a caliper 12 are attached to the upper opening of a U-shaped support 10 that is assembled to a part of the vehicle body. is assembled so as to be slidable from above in the left-right direction in the second figure. The caliper 12 is formed in a shape that straddles the outer periphery of the rotor 13, supports the outer pad 14 at its tip 12a, and supports the outer pad 14 at both ends 12b shown in FIGS. , 10a in a slidable manner in the left-right direction shown in FIG. 2, and the support 10
It is pressed downward by a pair of springs 15, 15 assembled to the. Also, the base 1 of the caliper 12
A cylinder 12d is formed in the cylinder 2c in the left-right direction as shown in FIG. The piston 16 is assembled with the opening on the left side in FIG. 2, and a boot 18 is interposed between the opening of the cylinder 12d and the outer periphery of the left end (outer end) of the piston 16 as shown in FIG. There is. The boot 18 is assembled by fitting one end into an annular groove 12e formed in the caliper 12 and the other end into an annular groove 16a formed in the piston 16, and prevents water, dust, etc. from entering the cylinder 12d. prevents infiltration. Also, a shim 1 is provided between the outer end surface of the piston 16 and the back metal 11a of the inner pad 11.
9 is interposed. As shown in FIGS. 2 and 3, the shim 19 has four mounting claws 19a to 19a.
At 9a, the piston 1 is attached to the inner periphery of the opening of the piston 16.
It is removably assembled in the sliding direction of 6, and prevents brake squeal that occurs during braking.

Therefore, in this embodiment, a shielding part 19b is formed on the outer peripheral part of the shim 19 to cover substantially the entire part of the boot 18 facing the rotor, and a lower part of the shielding part 19b (the axis of the rotor 13 a fan-shaped bent portion 19 that is bent toward the boot 18 side and surrounds the outer periphery of the boot 18;
c is formed by drawing. Further, in this embodiment, a back metal 11a of the inner pad 11 is bent toward the inner pad 11 at the upper part of the shim 19.
A detent pawl 19d is formed that is removably engaged upwardly (in the radial direction of the rotor 13) with a notch 11b provided in the rotor 13 to keep the relative positions of the shield portion 19b and the bent portion 19c and the boot 18 constant. , sim19
Rotation is prevented.

In this embodiment configured in this manner, heat from the rotor heated by braking can be shielded by the shielding portion 19b of the shim 19, so that heat damage to the boot 18 can be suppressed. can. Also, when setting the inner pad 11 on the front surface of the shim 19 assembled to the piston 16 (or vice versa), in other words, the outer pad 14, the piston 16, the boot 18, and the shim 1 are attached to the caliper 12.
With 9 etc. assembled, insert these into inner pad 1.
When assembling the shim 19 from above to the support 10 supporting the shim 19 (or vice versa), the bent portion 1 of the shim 19
9c is the back metal 11a of the inner pad 11 and the boots 1
Since the boots 8 are prevented from coming into contact with each other, damage to the boots 18 can be reliably prevented. Also, the bent portion 1 of the shim 19
Since 9c surrounds the outer periphery of the boot 18, it effectively shields the solidified mud and the like that are scattered toward the boot 18 due to the heat and centrifugal force from the rotor 13, thereby protecting the boot 18. In addition, in this embodiment, the shim 19 is formed with a rotation prevention pawl 19d to prevent the shim 19 from rotating, so that the shielding part 19b and the bent part 19c are attached to the boot 18 after the disc brake is assembled. The relative positions do not change, and not only the protection function of the boot 18 by the shielding part 19b and the bent part 19c is not impaired, but also interference between the shim 19 and the caliper 12 is prevented, and a decrease in braking efficiency is prevented.

In addition, when implementing the present invention, please refer to Figures 4 to 8.
As shown in the figures, it is also possible to implement the respective modifications. Figure 4 is related to the rotation of the shim, and the shim 119 has two rotation prevention claws 1.
19d and 119d are formed, and each anti-rotation pawl 11
9d is engaged with the upper surface of the back metal 111a of the inner pad 111 so as to be able to be removed upwardly. Thereby, in this case, there is no need to provide a notch on the upper surface of the back metal 111a of the inner pad 111. 5 and 6 relate to a shim, in which cuts 219e to 219e are provided radially in the lower part of the shim 219, and a bent portion 219c is formed by bending. This modification is intended to alleviate the problem that when a shim is formed with a bent portion, the shim tends to be distorted and its flatness deteriorates. 7 and 8 also relate to the shim, and the lower end of the shim 319 has a tongue-shaped bent portion 3.
19c is formed. This modification is intended to reduce costs, and the bent portion 319c can sufficiently prevent contact between the pad back metal and the boot during assembly.

[Brief explanation of the drawing]

FIG. 1 is a side view of a disc brake according to the present invention, FIG. 2 is a cross-sectional view taken along line - in FIG. 1, and FIG. 3 is a cross-sectional view taken along line - in FIG. 2. Further, FIG. 4 is a sectional view showing a modified example of the shim for preventing rotation, FIG. 5 is a front view showing a modified example of the shim, FIG. 6 is a sectional view taken along the line - in FIG. 5, and FIG. A front view showing another modification of the shim, and FIG. 8 is a sectional view taken along the line - in FIG. 7. Explanation of symbols, 11... Inner pad, 11a...
...Inner Pad's secret fund, 12...Calipa, 12
d...Cylinder, 13...Rotor, 16...Piston, 18...Boot, 19...Shim, 19b...
...shielding part formed on the shim, 19c... bending part formed on the shielding part of the shim, 19d... anti-rotation claw formed on the shim.

Claims (1)

[Scope of utility model registration request] A boot is interposed between the opening of the cylinder formed in the caliper that straddles the outer circumference of the rotor and the outer circumferential surface of the outer end of the piston that is slidably assembled in the cylinder in the axial direction. In a disc brake in which a shim is interposed between the back metals of pads facing each other, and the shim is directly attached to the piston in a sliding direction so that it can be attached and detached, the outer periphery of the shim is A shielding portion that covers a portion facing the rotor is formed, and a bent portion that is bent toward the boot side and surrounds the outer periphery of the boot is formed in a portion of the shielding portion on the axis side of the rotor, and the shim A disc brake characterized in that a detent pawl is formed on the pad so as to removably engage with the backing metal of the pad in the radial direction of the rotor to keep the relative positions of the shielding part and the bent part and the boot constant.