JP2583286Y2 - Disc brake pad holding structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pad holding structure for a disc brake, and more particularly to an improved pad holding structure for a disc brake provided with a spring for holding an outer pad in close contact with the inner surface of a caliper claw.

[0002]

2. Description of the Related Art In a disk brake, an inner pad and an outer pad are pressed against the front and back surfaces of a disk rotor by operating a hydraulic cylinder to perform a braking action. When the braking operation is released, it is necessary to separate the pad from the disk rotor to form a predetermined clearance between the pad and the disk rotor in order to prevent the pad from dragging. For this reason, it is common practice to cause the piston in the hydraulic cylinder to be performed by the elastic restoring force of the square seal on the inner pad side, and connect the caliper claw and the pad with a spring on the outer pad side, and to apply the urging force of the spring to the claw It is pulled in and held on the inner surface to separate it.

In a conventional pad holding structure for an outer pad, the outer pad is formed so as to be elastically urged outward in the axial direction of a disk rotor and is held in close contact with a caliper claw. Therefore, the outer pad pressing spring structure usually has a fixing portion to the pad and an engaging portion to the outer surface of the caliper claw, and draws the pad fixing portion in the axial direction of the disk rotor from the engaging portion to the caliper claw as a base point. It is energizing. For example, Japanese Utility Model Laid-Open Publication No. 59-108831,
A projection is provided on the back metal of the outer pad, the center of the spring is engaged with the projection, and a pair of arms extending sideways from the fixed portion is engaged with the outer surface of the tip of the caliper claw to attach the pad in the rotor axial direction. I try to give it power.

[0004]

However, in the conventional outer pad holding structure, the pad can be urged in the axial direction of the rotor. However, since the pad can move along the plane, the pad is held by the inner surface of the caliper claw. Had the problem of vibrating. In particular, in the case of a disc brake having a caliper slide mechanism, play causes sliding of the slide pin due to wear of the slide pin slide or peeling of the plating due to vibration. Then, it caused abnormal noise.

The present invention focuses on the above-mentioned conventional problems, and in particular, improves the pad adhesion to a caliper claw, thereby suppressing generation of abnormal noise due to rattling of the pad. It is intended to provide structure.

[0006]

In order to achieve the above object, a pad holding structure for a disc brake according to the present invention comprises a caliper that straddles a rotor and a pair of pads arranged on both sides in the axial direction of the rotor. A disc brake pad holding structure, comprising a cylinder portion for pressing the pad of the disc brake and a caliper claw portion for pressing the pad on the other side, wherein the pad is held in close contact with the inner surface of the caliper claw portion by a spring. A first mounting portion for mounting a pad at a portion, and a second mounting portion for mounting a caliper claw portion at the other end.
And a tilt urging portion for urging the first mounting portion in a tilt direction in an angle range between the rotor shaft and the radius of the rotor toward the second mounting portion. did.

[0007]

According to the above construction, the pad is biased by the bias biasing portion of the spring in a tilting direction in an angle range between the rotor shaft and the radius of the rotor toward the second mounting portion.
Since the outer edge of the pad is in contact with a corner portion formed on the caliper, the outer edge of the pad is urged to come into close contact with the corner portion. Accordingly, the pad is brought into close contact with the inner surface of the claw by the component force directed outward in the rotor axial direction, and at the same time, the outer edge of the pad is pressed against the caliper corner by the component force directed outward in the rotor radial direction. As a result, the pad is held in close contact with a predetermined portion of the caliper claw, and even if the caliper body vibrates, the pad alone prevents plane vibration along the inner surface of the claw.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a pad holding structure for a disc brake according to the present invention.

FIGS. 1 and 2 are a sectional view of a disk brake having a pad pressing structure according to an embodiment and a front view of a main part viewed from an outer side. The disc brake is fixed to the vehicle body and is formed so as to straddle the disc rotor 10.
(See FIG. 2), and a pair of friction pads 14 and 16 composed of an inner and an outer are slidably guided in the axial direction of the rotor, and receive a braking torque by the friction pads 14 and 16. A caliper 18 is provided to press the friction pads 14 and 16 against each other, and has a floating structure attached to the support 12 via a guide. The inner portion of the caliper 18 includes a hydraulic cylinder mechanism 22.
, Whereby the inner pad 14 is pressed toward the rotor surface, and the caliper claw 26 extending toward the outer side via the body portion 24 of the caliper 18 is used to form the outer pad 1.
Similarly, a braking action is performed by pressing and moving 6 toward the rotor surface.

In such a configuration, the outer pad 16 is held in close contact with the inner surface of the caliper claw 26. In order to determine this holding position, the extension base of the claw 26 in the caliper body 24 is provided with the outer pad 16 in particular. A pad receiving corner portion 30 that engages with the outer edge of the back metal 28 is formed. Then, the outer pad 16 is elastically urged toward the corner portion 30, and the pad pressing spring 32 for holding the outer pad 16 in close contact with the caliper claw 26 is pressed by the caliper 18.
And the outer pad 16.

As shown in FIG. 2, the pad pressing spring 32 is disposed between a pair of caliper claws 26 provided on both sides of the brake center portion so as to sandwich the center. The central portion of the outer pad 16 to be approached can be biased toward the inner surface of the claw 26. Such a spring 32 is formed by bending a single spring wire, and as can be understood from the spring alone shape shown in FIG. 3, first, a fixing portion (first mounting) of the outer pad 16 to the center of the back metal 28 is used. Part) 34 is formed. The pad fixing portion 34 is formed by bending a central portion of a spring wire into a circular ring shape, and penetrates a screw shaft portion of a fixing bolt 36 screwed to the back metal 28 inside the ring, thereby forming a circumferential ring portion with a bolt. By fastening with the head, it is fixed and held integrally with the pad back metal 28. Pad fixing part 34
The ring start portion is disposed facing the outer edge of the rotor. From the ring start portion, a pair of arm portions 38 is located at a lower side portion, that is, a position closer to the rotor shaft portion side than the pad fixing portion 34, and a pair of The caliper claws 26 are extended laterally in the direction toward the distal end portion. And this arm 38
An extension 40 is formed at the extension of the caliper claw 26 with the outer surface of the distal end of the caliper claw 26. As can be understood from FIG. 1, there is a step between the caliper claw engaging portion 40 and the pad fixing portion 34 by the thickness of the claw 26, and the arm portion 38 connecting them is inclined.

Here, the caliper claw engaging portion 40 and the pad fixing portion 34 are formed so as to be free-form and substantially in the same plane, and therefore, the arm 38 connecting them is also free-form. Are not inclined, and are arranged in an inclined state as shown in FIG. 1 when assembled to the brake. Due to this, the connecting arm portion 38 biases the pad fixing portion 34 counterclockwise in FIG. 1 with the caliper claw engaging portion 40 as a base point. This is because there is a step due to the thickness of the caliper claw 26, so that the pad fixing portion 34
In the direction orthogonal to the connecting arm portion 38, that is, the inclination direction F in the angle range region between the rotor axis direction X and the radial direction Y of the disk rotor 10 (the angle θ between the rotor axis direction and 0 ° <θ <90 °). It is urged in the inclination direction facing. Of course, the connecting arm portion 38 is inclined from the beginning, and the body engaging portion (the second
It is also possible to urge the pad fixing portion 34 in the above-described inclination direction F with the base portion as the base point.

Each of the caliper claw engagement portions 40 located on both sides of the pad fixing portion 34 is formed by bending a spring wire into a loop shape, and a part of the loop portion is engaged with the caliper claw 26. Are to be combined. A step surface 42 is formed on the claw 26 side for engagement. Then, the extension from the caliper claw engaging portion 40 is temporarily fixed to the pad fixing portion 3.
After being folded back toward the outer surface of the caliper body portion 24, the outer surface of the caliper body portion 24 is bent in parallel with the pad back metal 28 along the radial direction of the rotor. An engagement step 44 formed on the body 24 and enclosing the outer surface of the caliper body 24 is provided at the bent end.
A body engaging portion (second mounting portion) 46 is formed which is locked to the body. That is, the body engaging portion 46 is for holding the spring 32 on the caliper 18, and the U-shaped enveloping portion for wrapping the portion formed to protrude on the outer surface of the caliper body portion 24 by forming the engaging step portion 44. In addition to having a ring portion 52, a ring portion 52 that fits into and engages with a groove 50 formed at the base of the engaging step portion 44 is provided at the distal end. As a result, the body engaging portion 46 of the spring 32 is
It is located further outward in the rotor axis direction than 0 and is set at a position away from the outer pad 16.

The pad pressing spring 32 according to the above configuration
Then, the center portion of the back metal 28 of the outer pad 16 is used as a mounting ground portion, and the pad fixing portion 34 is tightened and fixed.
Next, mounting is performed by hooking and engaging the body engaging portion 46 with the engaging step portion 44 of the caliper body portion 24. At this time, the caliper claw engaging portion 40 formed in the middle of the pad fixing portion 34 and the body engaging portion 46 is engaged with the outer surface of the claw 26. As a result, the direction in which the outer pad 16 is pulled by the connecting arm 38 of the spring 32 is set so as to be oblique to the angle range between the rotor radius and the rotor shaft, so that the outer pad 16 is formed on the inner surface of the caliper body 24. To the pad receiving corner portion 30, and simultaneously generate component forces in the rotor axial direction X and the rotor radial direction Y, thereby causing the outer pad 16 to move the caliper claw 1.
6 can be closely held. As a result, even if play occurs in the caliper sliding guide or the like and vibration occurs, the outer pad alone is prevented from vibrating, and can always be brought into close contact with the caliper 18 to prevent the occurrence of troubles such as abnormal noise.
In particular, in the embodiment, the caliper claw engaging portion 40 is brought into contact with the caliper claw 16, so that the outer pad 16 is reliably separated from the disk rotor 10 and the effect of reducing drag is obtained.

FIG. 4 shows a second embodiment in which the caliper claw engaging portion 40 is not provided. That is, between the pad fixing portion 34 as the first attaching portion and the body engaging portion 46 as the second attaching portion, the “C” -shaped bent portion 54 that contacts the inner surface of the body portion 24 is formed. The pad fixing portion 34 is biased obliquely with the contact portion 56 on the inner surface of the body portion 24 as a fulcrum. In this case, the connecting arm portion 58 from the contact portion 56 toward the pad fixing portion 34 serves as an inclined urging portion. According to this embodiment as well, the outer pad 16 is urged directly and elastically in the oblique direction, so that the outer pad 16 can be brought into close contact with the caliper claw 26.

[0016]

As described above, in the pad holding structure according to the present invention, the caliper that straddles the rotor and the pair of pads arranged on both sides in the axial direction of the rotor includes a cylinder portion that presses the pad on one side and the other caliper. And a caliper claw for pressing the pad on the side of the disc brake, wherein the pad is held in close contact with the inner surface of the caliper claw by a spring. And a second mounting portion for mounting a caliper claw portion at the other end portion, in an angle range between the rotor shaft and the rotor radius toward the second mounting portion side of the first mounting portion. The tilt urging unit that urges the pad in the tilt direction generates the pulling force in the rotor axis direction and the radial direction at the same time, and enables the pad to be held in close contact with the caliper claw. According to prevent planar moving of the pad, the pad is effective to stably hold. Further, by providing the caliper claw engaging portion, a force for always separating the pad from the rotor can be reliably generated, and an effect of reducing pad drag can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a disc brake provided with a pad holding structure according to an embodiment.

FIG. 2 is a front view of the disc brake as viewed from an outer side.

FIG. 3 is a perspective view of a spring according to the embodiment.

FIG. 4 is a partial sectional view of a disc brake showing a pad pressing structure according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Disc rotor 12 Support 14 Inner pad 16 Outer pad 18 Caliper 22 Hydraulic cylinder mechanism 24 Caliper body part 26 Caliper claw 28 Back metal 30 Pad receiving corner part 32 Pad pressing spring 34 Pad fixing part 36 Fixing bolt 38 Connecting arm part 40 Caliper claw engagement Joint part 42 Step surface (claw) 44 Engagement step part 46 Body engagement part 48 U-shaped wrapping part 50 Groove 52 Ring part

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16D 55/224 112 F16D 65/097

Claims (1)

(57) [Scope of request for utility model registration] A caliper straddling a rotor and a pair of pads disposed on both sides in the axial direction of the caliper includes a cylinder portion for pressing a pad on one side and a caliper claw portion for pressing a pad on the other side. In a pad holding structure of a disc brake for holding a pad in close contact with an inner surface of a claw portion by a spring, the spring has a first mounting portion for mounting a pad at one end and a second mounting portion for mounting a caliper claw portion at the other end. And a tilt urging portion for urging the first mounting portion in a tilt direction in an angle range between a rotor shaft and a radius of the rotor toward the second mounting portion. Pad holding structure for disc brakes.