JPS6210497Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a disc brake in which a caliper is slidably guided along a guide rail of a support.

As shown in FIG. 1, a conventional disc brake of this type has a support 2 that is fixed to the vehicle body on one side of the brake disc 4, and a support 2 that straddles the brake disc 4.
A pair of shoulders 2a is provided on which a guide rail 20 is provided which has a flat sliding guide surface 24 extending parallel to the central axis of the brake disc 4.
On the other hand, the caliper 3 has protrusions 1 with a triangular cross section on both side walls.
2 is provided, which is connected to the guide surface 2 of the support 2.
4, and is lightly pressed down by a leaf spring 15 fixed to the shoulder 2a with a bolt 13. A central part of the caliper 3 having a peephole 10 straddles the brake disc 4, and a cylinder 8 into which a piston 9 is fitted at one end.
However, a reaction force piece 16 is provided at the other end.

A pair of friction pads 5 arranged on both sides of the brake disc 4 are slidably supported on the back plate 6 at a portion below the sliding guide surface 24 of the support 2, and one Due to the piston 9, the other side is the reaction force piece 16
The brake disc 4 is pressed against the side surface of the brake disc 4 by the brake disc 4.

In the above-mentioned conventional disc brake, the sliding part between the support 2 and the caliper 3 is directly exposed to the outside, so not only does the smoothness of the sliding movement become hindered by the intrusion of dust, but it also becomes difficult to release the brake. When this happens, the caliper 3 may not return sufficiently and the friction pad 5 may remain in contact with the brake disc 4.

In view of these problems, the purpose of the present invention is to provide a disc brake in which the sliding part of the caliper relative to the support is sealed from the outside by a sealing member, and the caliper returns using the elastic restoring force of the sealing member. It's about doing.

Therefore, in the present invention, a pair of friction pads are supported on a caliper that is integrally equipped with a hydraulic cylinder device.
In a disc brake in which the caliper is guided and supported by a support fixed to the vehicle body so as to be slidable in a direction perpendicular to the brake disc, the sliding surface of the support and the sliding surface of the caliper are each provided with corrosion resistance. a loop that overlaps metal guide plates having the same structure, fixes one with a pin, supports the other so as to be able to slide within a predetermined range, and that surrounds and tightly adheres to both side and end faces of both metal guide plates; It is equipped with a single seal member made of a shaped elastic material.

To explain the present invention based on an embodiment, as shown in FIG.
A horizontal guide surface 24 and a vertical wall 26 are constructed. On the other hand, a guide surface 28 opposite to the guide surface 24 is formed on the protrusion 12 of the caliper 3.

According to the present invention, as shown in FIG. 3, each of the guide surfaces 24 and 28 is provided with guide plates 25 and 2 made of highly corrosion-resistant and wear-resistant material such as stainless steel or bearing metal.
1 are stacked on top of each other, one is fixed and the other is slidably supported.

In the embodiment of FIG. 3, the guide plate 25 is fixed by the pin 22, while the guide plate 21 is fixed by the guide surface 28.
and is supported slidably relative to the guide plate 25. In this case, in order to limit the relative sliding amount of the guide plate 21 with respect to the guide plate 25, a groove 17 having a predetermined length in the sliding direction is provided.
The tip of the pin 22 is engaged with.

Then, as shown in FIGS. 3 and 4, a loop-shaped sealing member 23 made of an elastic material such as rubber is closely attached to surround both side walls and both end walls of the guide plates 21 and 25 which are overlapped with each other. The lower end edge of this seal member 23 is in close contact with the guide surface 24, and the upper end edge is held down by a protrusion 21a formed by increasing the width of the upper surface side of the guide plate 21. In this way, two guide plates 2 are provided between the guide surface 24 of the support 2 and the guide surface 28 of the protrusion 12 of the caliper 3.
5 and 21 are overlapped and pressed by a leaf spring 15 fixed to the support 2 with a bolt 13. The other configurations are similar to the conventional example shown in FIG.

Since the present invention is constructed as described above, when pressurized fluid is supplied to the inside of the cylinder 8 shown in FIG. The other friction pad 5 is pressed against the brake disk 4 by the reaction force piece 16 to generate a braking force. The guide plate 21 slides with respect to the guide plate 25 together with the caliper 3. Since both sliding surfaces are covered by the seal member 23, they are always kept clean and smooth sliding is ensured.

Due to the relative sliding of the guide plate 21 with respect to the guide plate 25, one end of the seal member 23 is stretched, and when the brake is released due to this elastic restoring force, the caliper 3 returns to its original state together with the guide plate 21. returned to position. Therefore, if one side of the friction pad 5 is supported by the piston 9 and the other by the reaction piece 16, the friction pad 5 can be completely separated from the brake disc 4, and dragging can be prevented.

Note that when the sliding amount of the caliper 3 increases due to wear of the friction pad 5, the groove 17 of the guide plate 21
hits pin 22 and cannot move any further,
The caliper 3 slides against the guide plate 21. Then, when the brake is released, the guide plate 21
and the caliper 3 return together under the restoring force of the seal member 23. Caliper 3 and guide board 2 like this
1, the gap between the friction pad 5 and the brake disc 4 is automatically adjusted.
By appropriately setting the sliding range between the pin 22 and the groove 17, an appropriate braking gap can be obtained.

As described above, the present invention has a pair of guide plates 25 and 21 superimposed on the sliding surface, and a sealing member 23 surrounding the entire circumferential wall is attached to these, so that the sliding contact between the support 2 and the caliper 3 is always maintained. Not only can the moving surface be kept clean, but also the return movement of the caliper 3 can be obtained by the elastic restoring force of the seal member 23, and furthermore, if excessive movement of the caliper 3 occurs, the contact between the caliper 3 and the guide plate can be maintained. A relative movement occurs between
The braking gap can be corrected to an appropriate value, which is a simple configuration and yet provides an extremely excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view of a conventional disc brake, Fig. 2 is a front view of a caliper guide and support device in the disc brake according to the present invention, and Fig. 3 is a diagram showing the sliding movement between the support and the caliper. FIG. 4 is a front sectional view showing an enlarged portion of the support, and FIG. 4 is a plan view of the sliding guide portion of the support. 2: Support, 3: Caliper, 4: Braking disc,
5: Friction pad, 6: Back plate, 15: Leaf spring, 1
7: Groove, 21, 25: Sliding guide plate, 22: Pin,
23: Seal member, 24, 28: Sliding guide surface.

Claims (1)

[Scope of utility model registration request] 1 in a caliper equipped with an integrated hydraulic cylinder device
In a disc brake in which a pair of friction pads are supported and the caliper is guided and supported by a support fixed to the vehicle body so as to be slidable in a direction perpendicular to the brake disc, the sliding surface of the support and the sliding surface of the caliper are supported. Corrosion-resistant metal guide plates are stacked on each moving surface, one is fixed with a pin, and the other is supported slidably within a predetermined range. 1. A caliper guide and support device for a disc brake, characterized in that a single sealing member made of a loop-shaped elastic material that surrounds both end faces and is in close contact with each other is attached.