JPS641549Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a disc brake, particularly to an improvement in the rattling prevention structure of the outer friction pad.

Generally, in a disc brake with a floating caliper, of a pair of friction pads facing each other with the rotor in between, the inner one is pressed against the rotor by a pad pressing mechanism built into the caliper, and the outer one is pressed against the rotor by the reaction force. Because it is configured to press against the rotor by the reaction part of the caliper that moves in the rotor axial direction,
It is desirable that the outer friction pad be configured to move forward and backward in the rotor axial direction integrally with the caliper as an attached member.

This is natural because when moving forward toward the rotor, a pressing force is applied from the rear surface to generate braking force, and when moving backward, the purpose is to prevent dragging when the brake is not applied.

Therefore, from this point of view, in a type of disc brake in which brake torque is directly received by a support without going through a caliper, a pair of friction pads is guided to move in the rotor axial direction using, for example, a pad retainer pin. In addition to this, a device has been proposed in which a coil spring is fitted to the pad retainer pin to apply a spring force to the friction pad in a direction away from the rotor.

According to such a configuration, adverse effects such as stepped wear of the pad retainer pin due to vibration of the outer side friction pad during non-braking can be prevented, but since the attachment part is the rotor edge, the rotor diameter However, there were aspects of the design of the Caliper that could not be called advantageous.

It is also possible to process the friction pads and calipers and incorporate a spring force biasing mechanism to connect them, but this would pose problems in terms of compatibility with other types of disc brakes, and it would also require a lot of man-hours to process the calipers. There was also the difficulty of increasing the amount.

Therefore, the present invention makes it possible to stabilize the outer friction pad by simply adding a retaining spring of a simple shape, without changing the configuration of the conventional disc brake.

The rattling structure of the friction pad according to the present invention that achieves this purpose includes a support arranged and fixed across the outer diameter of the rotor edge, a caliper that straddles the rotor edge, and one side of the rotor. an inner side friction pad that is placed on the other side of the rotor and pressed against the rotor by a pad pressing mechanism built into the caliper; an outer side friction pad that is placed on the other side of the rotor and pressed against the rotor by the reaction part of the moving caliper; The caliper is assembled and fixed to the boss portion of the caliper so as to form a support, and is for inserting and engaging at least the outer friction pad in the thickness direction to suspend the caliper, and for movably supporting the caliper in the rotor axial direction with the support. In a disc brake equipped with a slide pin, a disc-shaped retaining spring that fits into the slide pin and applies a spring force to the outer friction pad in the rotor separation direction is assembled, and the boss portion of the caliper and the outer The structure is such that the spring force is applied between the side friction pad and the side friction pad.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a comparative example, in which 1 is a support arranged and fixed so as to straddle the edge of a rotor (not shown), and this support 1 is formed with an opening 2 passing through in the axial direction of the rotor. . Reference numeral 3 denotes a caliper disposed so as to straddle the edge of the rotor, and a pad pressing mechanism (hydraulic cylinder device, etc.) is built into the leg 4 on one (inner side) of the opposing legs that sandwich the rotor. The other leg 5 forms a reaction part.
This caliper 3 is supported movably in the axial direction of the rotor by the support 1 via a sliding support mechanism to be described below, and is supported by a pad pressing mechanism that presses an inner friction pad (not shown) against the rotor and by this reaction force. The reaction portion is provided so that a braking force is obtained by pressing the outer friction pad 6 against the rotor upon movement in the axial direction of the rotor.

7 is a boss portion 8 extending to the left and right sides of the caliper 3;
A slide pin is screwed and fixed to the support 1, and constitutes a sliding support mechanism that movably supports the caliper 3 by slidingly fitting into the opening 2 of the support 1.

In addition, in the drawings, the configuration of a boot that seals the sliding joint between the slide pin 7 and the opening 2 from the outside air, a sleeve that covers the slide pin, etc. is omitted because it is not directly related to the present invention. However, it goes without saying that these may be assembled as appropriate in practice.

In this example, the outer end of the slide pin 7 is made to protrude through the caliper boss part 9, and a stepped small diameter part 11 is formed at the tip, and the protrusion 10 of the slide pin 7 allows the outer friction pad 6 is suspended and supported movably in the rotor axial direction, and furthermore, the front surface of the back plate (the surface facing the rotor) of the outer friction pad 6,
The holding spring 13 is attached to the small-diameter stepped portion 12 of the slide pin 7 to exert a gripping spring force. This holding spring 13 has a U-shape, and one arm portion 14 is connected to the protruding portion 1 of the slide pin 7.
a through hole or notch having a larger diameter than the protrusion 10 so as to have a degree of freedom of movement in the axial direction with respect to 0;
The other arm portion 15 is provided with a through hole or notch having a larger diameter than the small diameter portion 11, but is configured so that it cannot engage and fit into the stepped portion 12 of the protruding portion 10. ing. In other words, this holding spring 13 has one arm portion 15 that is locked to the stepped portion 12 at the outer end of the slide pin 7, while the other arm portion 14 is locked to the protrusion portion 1 of the slide pin 7.
The structure is such that it can be elastically deformed to expand the open end of the U-shape in a state where it is fitted.
The back plate of the outer friction pad 6 whose back surface engages with the outer leg 5 (so-called caliper claw part) which is the reaction part of the caliper 3 is attached to the slide pin 7 as described above. located between the pair of U-shaped arm portions 14 and 15 of the holding spring 13;
Moreover, by providing this assembly so that the holding spring 13 is elastically deformed from its natural state so that the tips of its pair of arm portions 14 and 15 are expanded,
After assembly, the outer friction pad 6 is always attached to the retaining spring 1.
The caliper 3 is elastically engaged with the outer leg portion 5 of the caliper 3 with the elastic restoring force of 3.

FIG. 2 shows an embodiment of the present invention. In this embodiment, a disc spring 16 is fitted into the protrusion of the slide pin 7, and in the assembled state, the disc spring 16 is connected to the side surface of the boss portion 9 of the caliper 3 and the outer side. The friction pad 6 is elastically compressed and deformed between it and the front surface of the back plate. In other words, with respect to the length obtained by subtracting the back plate thickness of the outer friction pad 6 from the gap amount in the rotor axial direction between the boss portion 9 side of the caliper 3 and the pad engagement surface of the outer leg portion 5, The disc spring 16 is configured to have a slightly larger height in its natural state.

In this example, common members are given the same reference numerals as in FIG. 1, and their explanations are omitted.

According to the above structure, the assembly work of the outer friction pad is almost the same as that of the conventional type, and the disk spring has a simple structure and can apply a large spring force, so that the parts By adding a brake pad, it is possible to stably prevent vibration of the friction pad, and it is also easy to provide compatibility when changing the brake model, so the practical benefits are extremely large. It was hot.

[Brief explanation of drawings]

FIG. 1 is a partial plan sectional view of a disc brake according to a comparative example, and FIG. 2 is an enlarged plan sectional view of a holding spring assembly section showing an embodiment of the present invention. 1: Support, 2...Opening, 3: Caliper, 4,
5... Leg part, 6: Outer side friction pad, 7: Slide pin, 8, 9... Boss part, 10... Projection part, 11
...Small diameter part, 12...Stepped part, 13...Retaining spring, 1
4, 15...arm portion, 16...disc spring.

Claims (1)

[Scope of utility model registration request] A support arranged and fixed across the outer diameter of the rotor edge, a caliper that straddles the rotor edge, and an inner friction pad that is placed on one side of the rotor and pressed against the rotor by a pad pressing mechanism built into the caliper. , an outer friction pad which is disposed on the other side of the rotor and is pressed against the rotor by the reaction part of the moving caliper; and at least the outer friction pad which is assembled and fixed to the boss part of the caliper so as to form the axial direction of the rotor. In a disc brake equipped with a slide pin for inserting and engaging in the thickness direction to suspend the caliper and supporting the caliper movably in the rotor axial direction with a support, the disc brake is fitted with the slide pin to suspend the outer side friction A disc-shaped retaining spring that applies a spring force in the direction of separating the rotor is attached to the pad, and is arranged so that the spring force acts between the boss portion of the caliper and the outer friction pad. Disc brake friction pads feature a rattling prevention structure.