JPH0663945U - Leaf spring for urging pad of disc brake - Google Patents

Abstract

(57) [Abstract] [Purpose] With a disc brake pad capable of suitably suppressing a hit sound generated during braking due to rattling of a pad accommodated in a pad accommodating notch of a torque plate in a disc rotor circumferential direction. A biasing leaf spring is provided. A protrusion 46 of a pad back plate 36 is inserted into a notch 54 formed in a pad accommodating notch. Cutout 54
A U-shaped rust prevention plate 58 is attached to the inner surface of the first extension part 74 provided integrally with the rust prevention plate 58.
Thus, the back plate 36 is biased to the left in FIG. A rubber film 88 as a cushioning material is provided on the inner surface of the bottom portion 62 of the rust preventing plate 58, which is opposed to the first extending portion 74.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc brake, and more particularly to a U-shaped pad urging leaf spring that urges a pad accommodated in a pad accommodating notch of a torque plate thereof in one circumferential direction of a disc rotor.

[0002]

[Prior art]

 A pad that has a back plate and is pressed against the disc rotor, and accommodates the pad so that it can move in a direction parallel to the axis of the disc rotor with a certain rattling in the circumferential direction of the disc rotor. And a torque plate having a pad accommodating notch formed therein, and the braking torque generated in the pad is transferred from a side surface of the back plate facing the circumferential direction of the disc rotor to an inner wall surface of the pad accommodating notch facing the side surface. Transmission type disc brakes have been provided in the past. Between the side surface of the back plate and the inner wall surface of the pad accommodating notch, there is usually a pair of facing portions facing each other at a predetermined interval, and a U-shaped pad biasing leaf spring is formed as a whole. Is preloaded, and the pad biasing leaf spring biases the pad in one direction in the circumferential direction of the disk rotor, so that the pad rattles in the circumferential direction of the disk rotor while the vehicle is running. Is prevented.

In a disc brake including such a pad biasing leaf spring, a side surface of a back plate of the pad is notched by a pad accommodating notch via a pair of opposing portions of the pad biasing leaf spring during braking while the vehicle is traveling. In order to suppress the hitting sound generated when it hits the inner wall surface of the pad, it is considered to provide a cushioning material made of a rubber-like elastic material between the pad biasing leaf spring and the inner wall surface of the pad accommodating notch. Has been.

[0004]

[Problems to be solved by the device]

 However, when a cushioning material is provided between the pad biasing leaf spring and the inner wall surface of the pad housing notch as described above, the torque when the side surface of the back plate hits the inner wall surface of the pad housing notch. Although the hit sound generated based on the vibration of the plate can be appropriately suppressed, it is difficult to appropriately suppress the hit sound generated based on the vibration of the pad. In other words, when the side surface of the back plate of the pad is abutted against the inner wall surface of the pad accommodating notch, one facing portion on the back plate side of the pad biasing leaf spring is directly abutted against the other facing portion. A relatively large vibration is generated in the pad, and the vibration of this pad, and thus the hit sound based on that vibration, is more suitable due to the cushioning material provided between the pad biasing leaf spring and the inner wall surface of the pad accommodating notch. It is difficult to suppress the contact noise to the pad, and it is difficult to say that the pad hit noise that occurs during braking can be suppressed sufficiently.

The present invention has been made in view of the above circumstances, and its purpose is to prevent rattling of a pad housed in a pad housing notch of a torque plate in the disk rotor circumferential direction. (EN) Provided is a leaf spring for urging a pad of a disc brake, which is capable of suitably suppressing a hitting sound generated during braking.

[0006]

[Means for Solving the Problems]

 The gist of the present invention for achieving the above object is to have a pad having a back plate to be pressed by the disc rotor and a predetermined rattling in the circumferential direction of the disc rotor. A torque plate having a pad accommodating notch for accommodating the disc rotor in a state parallel to the axis of the disc rotor so that the braking torque generated in the pad can be applied to the disc rotor of the back plate. In a disc brake of a type in which the side surface facing the circumferential direction transmits to the inner wall surface facing the side surface of the pad accommodating notch, a pair of facing portions facing each other at a predetermined interval are provided as a whole. A U-shaped pair of opposing portions is inserted between the side surface of the back plate and the inner wall surface of the pad accommodating notch in a preloaded state to move the pad in one direction in the circumferential direction of the disk rotor. Bias That a biasing leaf spring pads, at least one of the opposed to that surface of the pair of opposing portions is to integrally provided with the cushioning material.

[0007]

According to the pad urging leaf spring of the disc brake having the above-described structure, the pair of opposing faces inserted in a preloaded state between the side surface of the back plate of the pad and the inner wall surface of the pad accommodating notch. Since a cushioning material is integrally provided on at least one of the facing surfaces of the part, when the side surface of the back plate is abutted against the inner wall surface of the pad accommodating notch during braking, Since one opposing part on the back plate side of the pad biasing leaf spring is abutted against the other opposing part and the inner wall surface of the pad accommodating notch via the cushioning material, vibration of the torque plate and pad generated at that time It is possible to preferably suppress the contact noise due to the vibration of the torque plate and the contact noise due to the vibration of the pad by the cushioning material. As a result, compared to the conventional case in which a cushioning material is provided between the pad biasing leaf spring and the inner wall surface of the pad accommodating notch, it is possible to more appropriately suppress the pad hitting noise generated during braking.

[0008]

【Example】

 An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 2 and FIG. 3 are views showing an essential part of a disc brake having a pad biasing leaf spring which is an example of the present invention. In these figures, 10 is a disk rotor, 12 is a caliper, and 14 is a torque plate. The caliper 12 includes a cylinder portion 16 and a pawl portion 18 that integrally extends from the cylinder portion 16 and faces the cylinder portion 16 with the disk rotor 10 in between. 20 is fitted so as to be able to project to the claw portion 18 side. The torque plate 14 includes a substantially U-shaped fixing portion 24 fixed to a non-rotating member (not shown) with a pair of bolts 22 and a substantially U-shaped facing portion that faces the fixing portion 24 with the disc rotor 10 interposed therebetween. 26 and a connecting portion 28 that connects the opposite end portions of the fixed portion 24 and the facing portion 26 to each other and that is located on the outer peripheral side of the disk rotor 10 are integrally provided and have a U-shape. The inside of the fixed portion 24 and the facing portion 26 are formed as pad accommodating notches 29 and 31, and a pair of slide pins 30 projecting from the fixed portion 24 keeps the caliper 12 parallel to the axis of the disk rotor 10. It is supported so that it can move in any direction.

A pair of pads 32 and 34 are arranged between the claw portion 18 and the piston 20 with the disk rotor 10 sandwiched therebetween, and these pads 32 and 34 accommodate the pads of the torque plate 14. The notches 29 and 31 are respectively accommodated in the disk rotor 10 in a circumferential direction of the disk rotor 10 so as to be movable in a direction parallel to the axis of the disk rotor 10. The pads 32 and 34 each include a metal back plate 36 having a substantially rectangular shape as a whole, and a friction material 38 fixed to the surface of the back plate 36 located on the disk rotor 10 side. The pair of side faces 40, 42 of the back plates 36 of the pads 32, 34 facing the circumferential direction of the disc rotor 10 are provided at the intermediate portions in the radial direction of the disc rotor 10 with protrusions 44, 46 (projecting in directions separating from each other). In FIG. 2, only the pad 32 side is shown).

On the other hand, the pair of inner wall surfaces 48, 50 of the pad housing notches 29, 31 of the torque plate 14 facing each other in the circumferential direction of the disk rotor 10 are provided with notches 52, 54 (pads in FIG. 2) extending in directions away from each other. Only the accommodation notch 29 side is formed), and the protrusions 44, 46 of the back plate 36 of the pads 32, 34 are inserted into the notches 52, 54 of the pad accommodation notches 29, 31, respectively. It is included. In the notches 52, 54 of the pad accommodating notches 29, 31, there are rust prevention plates 56 for preventing rusting between the inner surfaces of the notches 52, 54 and the protrusions 44, 46 of the back plate 36. 58 are attached respectively. These rust preventive plates 56 and 58 are integrally formed from plate-like materials made of stainless steel, for example.

As shown in FIGS. 4 and 5, one of the rust prevention plates 58 has a bottom portion 62 that abuts the bottom surface (the surface facing the circumferential direction of the disk rotor 10) 60 of the cutout 54, and the cutout 54. An outer peripheral side portion 66 that faces the radial direction of the disk rotor 10 and abuts an outer peripheral side surface 64 located on the outer peripheral side of the disk rotor 10, and a notch 54 that faces the radial direction of the disk rotor 10 and that faces the radial direction of the disk rotor 10. The inner peripheral side surface 68 located on the inner peripheral side of the inner peripheral side 10 and the inner peripheral side portion 70 that contacts the inner peripheral side surface 68 have a side surface shape that is generally U-shaped. A first bending portion 72 that bends in a substantially C-shape is integrally provided at an edge portion of the bottom portion 62 of the rust prevention plate 58 on one side in a direction parallel to the axis of the disc rotor 10. The first curved portion 72 is provided with a flat plate-shaped first extending portion 74 that extends toward the inside of the rust preventive plate 58 and faces the bottom portion 62 with a predetermined gap, and also has a rust preventive plate. A protrusion 76 protruding in a direction opposite to the outer peripheral side portion 66 and the inner peripheral side portion 70 is provided on an edge portion of the bottom portion 62 of the other side 58 in the direction parallel to the axis of the disc rotor 10. . As a result, the rust preventive plate 58 is attached to the notch 54 with the fixing portion 24 and the facing portion 26 of the torque plate 14 sandwiched in the thickness direction by the first bending portion 72 and the protrusion 76, and at the same time, the first extending portion. The protrusions 46 of the back plate 36 pre-load the protrusions 74 toward the bottom 62, so that the pads 32 and 34 move in the forward rotation direction of the disk rotor 10 in accordance with the elastic restoring force of the first protrusions 74 (see FIG. 2). The pad 32, 34 is prevented from rattling in the circumferential direction of the disk rotor 10 while the vehicle is traveling by being biased in the A direction).

A second bending portion 78 that bends into a substantially C-shape is integrally provided at an edge portion of the inner peripheral side portion 70 of the rust prevention plate 58 on the first bending portion 72 side. At the tip of the second curved portion 78, a flat plate-shaped second extending portion 80 that extends inward of the rust preventing plate 58 and faces the inner peripheral side portion 70 at a predetermined interval is provided. The second extending portion 80 is preloaded to the inner peripheral side portion 70 side by the protrusions 44, 46 of the back plate 36, so that the pads 32, 34 are moved in accordance with the elastic restoring force of the second extending portion 80. The pads 32 and 34 are urged toward the outer peripheral side of the disk rotor 10 to prevent rattling of the pads 32 and 34 in the radial direction of the disk rotor 10. The inner peripheral side portion 70 of the rust preventive plate 58 is cut and raised by a predetermined amount in a direction in which it is separated from the outer peripheral side portion 66, thereby forming a relatively small angle outside the inner peripheral side portion 70. The protrusion 82 is provided so as to project in an inclined state. When the rust preventive plate 58 is fitted into the notch 54, the protrusion 82 is elastically pressed against the inner peripheral side surface 68 of the notch 54. It is like this.

The other rust preventive plate 56 is provided at an end edge portion of the rust preventive plate 58, which is located on the opposite side of the protrusion 76 of the bottom portion 62 in place of the first curved portion 72 and the first extending portion 74. It has the same structure as the rust preventive plate 58 except that a similar projection (not shown) facing the projection 76 is provided. As a result, the rust preventive plate 56 is attached to the notches 52 of the pad accommodating notches 29 and 31 with the fixing portion 24 and the facing portion 26 of the torque plate 14 sandwiched in the thickness direction by the protrusions 76 and the above-mentioned protrusions opposed thereto. At the same time, the protrusion 44 of the back plate 36 is urged toward the outer peripheral side of the disk rotor 10 by the second extending portion 80 (the reference numeral is omitted in FIG. 3) of the rust preventing plate 56. In cooperation with the second extending portion 80 of the rust prevention plate 58, rattling of the pads 32, 34 in the radial direction of the disk rotor 10 is prevented.

In the disc brake configured as described above, when the piston 20 is pushed out by the hydraulic pressure, one pad 32 is pressed against one surface of the disc rotor 10 and the reaction force causes the caliper 12 to move the piston 20. When the pad 34 is moved in the direction opposite to the projecting direction and the other pad 34 is pressed against the other surface of the disk rotor 10 by the claw portion 18, the disk rotor 10 is pinched and its rotation is suppressed. At this time, when the rotation direction of the disk rotor 10 is the forward direction of the vehicle (direction A in FIG. 2), the braking torque generated in the pads 32 and 34 is applied to the protrusion 44 of one of the back plates 36 of the back plates 36. It is transmitted from the tip end surface 84 to the bottom surface 60 (not shown in FIG. 3) of the notch 52 of the pad accommodating notches 29 and 31 via the bottom portion 62 of the rust prevention plate 56 so that the torque plate 14 can receive it. In addition, when the rotation direction of the disk rotor 10 is the reverse direction of the vehicle (the direction opposite to the A direction in FIG. 2), the pads 32 and 34 form the first extending portion 7 of the rust preventive plate 58. The braking torque generated in the pads 32 and 34 by being moved rightward in FIG. 2 against the urging force of the No. 4 rusts from the tip end surface 86 of the other protrusion 46 of the back plate 36. No. of anti-stick plate 58 Via an extending portion 74 and bottom portion 62 is transmitted to the bottom surface 60 of the notch 54 of the pad receiving notches 29 and 31 have become so that received by the torque plate 14. When the hydraulic pressure is released, the pads 32 and 34 are returned in the circumferential direction of the disc rotor 10 according to the elastic restoring force of the first bending portion 72 and the first extending portion 74 of the rust prevention plate 58. Has become. In this embodiment, the tip surfaces 84 and 86 of the protrusions 44 and 46 of the back plate 36 correspond to the side surfaces in the claims, and the bottom surfaces 60 of the cutouts 52 and 54 of the pad accommodating cutouts 29 and 31 are cracks. It corresponds to the inner wall surface in. Further, the portions of the first extending portion 74 and the bottom portion 62 that face the first extending portion 74 correspond to a pair of facing portions, and these and the first bending portion 72 constitute a pad biasing leaf spring. is doing.

In the present embodiment, further, as shown in FIGS. 1 and 5, at a position on the inner surface of the bottom portion 62 of the rust preventing plate 58 and facing the first extending portion 74, for example, A rubber elastic rubber rubber film 88 is formed by applying and curing a silicone rubber sealer. As a result, during reverse braking, the protrusion 46 of the back plate 36 and the first extending portion 74 of the rust preventive plate 58 are prevented from rusting via the rubber film 88, as shown by the chain line in FIG. It is adapted to abut against the bottom portion 62 of the plate 58 and the bottom surface 60 of the notch 54 of the pad accommodating notches 29 and 31. The rubber film 88 constitutes the cushioning material of this embodiment, and is, for example, 0.1 mm to 0. It has a thickness of about 3 mm, and has a hardness of about 20 ° to 50 ° in a JIS A type spring hardness tester, for example.

Here, conventionally, it has been considered to provide a cushioning material made of a rubber-like elastic material between the bottom portion 62 of the rust prevention plate 58 and the bottom surface 60 of the notch 54. In this case, when the protrusion 46 of the back plate 36 is abutted against the bottom surface 60 of the notch 54 of the pad accommodating notches 29 and 31, the vibration generated in the torque plate 14 and, in turn, the hit sound generated based on the vibration is damped. Although it can be suppressed appropriately by the material, at this time, the first extending portion 74 of the rust preventive plate 58 that comes into contact with the tip end surface 86 of the protrusion 46 of the back plate 36 directly contacts the bottom portion 62 of the rust preventive plate 58. Since the pads 32 and 34 are abutted against each other, a relatively large vibration is generated, and it is difficult to suitably suppress the vibration of the pads 32 and 34 and the hit sound generated based on the vibration by the cushioning material. .

On the other hand, according to the present embodiment, the rubber film 88 is provided on the inner surface of the bottom portion 62 of the rust preventive plate 58, and the protrusion 46 of the back plate 36 is provided with the pad accommodating notches 29, 31. When abutting against the bottom surface 60 of the cutout 54, the first extending portion 74 of the rust preventive plate 58 is projected through the rubber film 88 to the bottom portion 62 of the rust preventive plate 58 and the bottom surface 60 of the notch 54. Since it is applied, the vibrations of the torque plate 14 and the pads 32, 34 that occur at that time can be suitably suppressed by the rubber film 88, and the contact noise and the vibrations of the pads 32, 34 generated based on the vibration of the torque plate 14 can be suppressed. It is possible to suitably suppress the hit sound generated based on both. As a result, the hit sound of the pads 32, 34 generated during braking can be suppressed more suitably than in the conventional case.

Incidentally, in the case of the conventional case where a cushioning material made of a rubber-like elastic body and having a thickness of about 0.7 mm is provided between the bottom portion 62 of the rust prevention plate 58 and the bottom surface 60 of the notch 54. Was able to eliminate the hit sound of about 2 dB to 3 dB, whereas according to the present embodiment, it was possible to eliminate the hit sound of about 10 dB.

Further, according to the present embodiment, since the rubber film 88 as the cushioning material is formed by applying the sealer, the rubber film 88 can be appropriately suppressed in accordance with various disc brakes. There is an advantage that the thickness of the film 88 can be easily changed.

Further, according to this embodiment, the rubber film 88 is provided on the inner surface of the bottom portion 62 of the rust preventive plate 58, and a predetermined space is provided between the bottom portion 62 and the first extending portion 74. Since a gap is formed, for example, when a cushioning material that changes color due to braking heat (for example, a nitrile rubber-based primer) is used, the caliper 12 etc. can be observed by visually observing the degree of color change of the cushioning material from the outside. There is an advantage that it is also possible to grasp the heat history for.

Although one embodiment of the present invention has been described above with reference to the drawings, the present invention can be applied to other aspects.

For example, in the above-described embodiment, the rubber film 88 as the cushioning material is provided only on the inner surface of the bottom portion 62 of the rust preventive plate 58, but it is not always necessary. Alternatively, a cushioning material may be provided on the surface of the first extending portion 74 of the rust preventive plate 58 facing the bottom portion 62, and further, the bottom portion 62 and the first extending portion 74 face each other. In addition to providing the cushioning material on at least one of the surfaces to be formed, the cushioning material may be provided on the outer surface of the bottom portion 62 (contact surface with the bottom surface 60 of the notch 54).

Further, in the above-mentioned embodiment, the pad biasing leaf spring is provided integrally with the rust prevention plate 58, but it may be formed as a separate member from the rust prevention plate.

Further, in the above-mentioned embodiment, the rubber film 88 as the cushioning material is formed by applying the silicone rubber sealer, but it is not always necessary. For example, the above-mentioned nitrile rubber-based primer or The cushioning material may be formed by applying an adhesive containing a predetermined rubber, or a relatively soft metal film such as gold or copper formed by electroplating or by cationic electrodeposition coating. It is also possible to form the cushioning material by a relatively hard resin film such as the formed epoxy resin or a zinc chromic acid film formed by baking.

Further, in the above-described embodiment, the protrusion 46 protruding from the side surface 42 of the back plate 36 of the pads 32 and 34 and the bottom surface 60 of the notch 54 formed in the inner wall surface 50 of the pad accommodating notches 29 and 31 are provided. A pad urging leaf spring is provided between the pads 32 and 34, but the braking torque generated in the pads 32 and 34 is transmitted from the side surface 42 of the back plate 36 to the inner wall surface 50 of the pad accommodating notches 29 and 31. In such a case, the pad biasing leaf springs are provided between the side surface 42 and the inner wall surface 50.

Besides, the present invention can be variously modified without departing from the spirit thereof.

[Brief description of drawings]

FIG. 1 is an enlarged view of a main part of FIG. 3, showing a cross section.

FIG. 2 is a cross-sectional view showing an essential part of a disc brake including a pad biasing leaf spring to which the present invention is applied.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an enlarged perspective view showing a rust prevention plate 58 including a pad urging plate spring in FIG.

FIG. 5 is a view on arrow V in FIG.

[Explanation of sign]

10: Disc rotor 14: Torque plate 29, 31: Pad accommodating notch 32, 34: Pad 36: Back plate 60: Bottom surface (inner wall surface) {62: Bottom portion (opposing portion), 72: First curved portion, 74: No. 1 extension part (opposing part)} Leaf spring for urging pad 84,86: Tip surface (side surface) 88: Rubber film (cushioning material)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Etsuya Sagawa 10th Road, Wakai Town, Toyota City, Aichi Prefecture Hosei Break Industry Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A pad which has a back plate and is pressed against a disk rotor, and a pad which is parallel to the axis of the disk rotor with the pad having a predetermined rattling in the circumferential direction of the disk rotor. A torque plate having a pad accommodating notch for movably accommodating formed therein, and a braking torque generated in the pad facing the side surface of the pad accommodating notch from a side surface of the back plate facing a circumferential direction of the disc rotor. In the disc brake of the type that transmits to the inner wall surface, the pair of facing portions are opposed to each other at a predetermined interval and are U-shaped as a whole, and the pair of facing portions and the side surface of the back plate are A leaf spring for urging a pad, which is inserted between the inner wall surface of the pad accommodating notch and in a preloaded state to urge the pad in one direction in the circumferential direction of the disk rotor, the relative spring of the pair of opposed portions. Direction A leaf spring for urging a pad of a disc brake, characterized in that a cushioning material is integrally provided on at least one of the surfaces.