JP2007218274A - Disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disc brake capable of reducing the inclination of a sliding pin of a caliper resulting from the weight on the cylinder side of the caliper. <P>SOLUTION: The disc brake 100 comprises a disc rotor 18, brake pads 14, 15, and the caliper 10. The caliper 10 has the sliding pin 30. The sliding pin 30 is slidably received by a guide hole 24 formed in a mounting 12. An annular bush 60 is mounted on the sliding pin 30, and the bush 60 corrects the attitude of the sliding pin 30 to cancel the inclination of the axis of the sliding pin 30 to the axis of the guide hole 24, which arises in the guide hole 24. With the bush 60 correcting the inclination of the sliding pin 30, abnormal noises are reduced when the sliding pin 30 slides in the guide hole 24. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technology for suppressing noise generation of a disc brake, particularly a disc brake caused by a tilt of a slide pin of a caliper.

  One brake device that brakes a vehicle is a disc brake. In this disc brake, a pair of brake pads is disposed with a disc rotor sandwiched between calipers. The mounting fixed to the non-rotating portion of the vehicle has a pair of support arms spaced along the circumferential direction of the disk, and the support arms are provided with guide holes. The slide pin that is slidably inserted into the guide hole is fixed to the caliper by a bolt. When the caliper moves toward the disc rotor by sliding between the guide hole and the slide pin, the pair of brake pads clamp the disc rotor. As a result, wheel braking is performed. Such disc brakes are roughly classified into two types. One is a fixed caliper type in which pistons for driving the brake pads are arranged on the brake pads on both sides of the disc rotor. The other is that a piston that drives only one of the brake pads is arranged, and the other brake pad is a claw portion that is driven by a reaction force generated when the brake pad pressed by the piston contacts the disk rotor. It is a so-called floating caliper type that is pressed by. In particular, the floating caliper type has a small number of components and is widely mounted on popular vehicles.

However, in the case of a disc brake that includes a floating caliper, the heavy cylinder portion is arranged on one side of the caliper, so that the position of the center of gravity of the caliper is shifted, and the caliper may be inclined with respect to the axial direction of the disc rotor. is there. When the caliper is inclined, the slide pin is inclined with respect to the guide hole formed in the mounting, and this causes a sliding noise (an abnormal noise) when the slide pin slides. As a configuration for reducing the caliper inclination, for example, in the disc brake device described in Patent Document 1, the caliper claw side is coupled to a support that supports the caliper so as to be movable in the axial direction of the rotor. Equipped with wire spring. With this wire spring, the position of the center of gravity of the caliper is biased toward the cylinder side, and a rotational moment in a direction that cancels the rotational moment acting on the caliper is applied to the claw portion side, thereby reducing the inclination of the caliper.
Japanese Patent Laid-Open No. 10-259834

  However, there is a limit to the movement of the center of gravity by the wire spring disclosed in Patent Document 1, and in the case of a caliper having a large cylinder, the tilt of the slide pin may not be completely suppressed, and a countermeasure that can suppress the tilt more effectively. Is desired. Some disc brakes are integrated with a parking brake (hereinafter referred to as PKB). In this PKB integrated disc brake, a PKB unit is disposed on the back side of the cylinder. Therefore, the weight on the cylinder side is increased, and the inclination of the caliper with respect to the rotating shaft of the disk rotor is further increased. For this reason, the necessity of suppressing the tilt of the slide pin is further required, and a proposal for a new tilt suppression structure is desired.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a brake disk that can reduce the inclination of the caliper slide pin due to the weight of the caliper on the cylinder side.

  In order to solve the above-described problems, in one aspect of the present invention, a disk rotor that rotates together with a vehicle wheel, a brake pad that is disposed to face a frictional sliding surface of the disk rotor, and a frictional sliding of the disk rotor. A caliper that has a pressing surface substantially parallel to the moving surface, presses the brake pad against the disc rotor by bringing the pressing surface into contact with the rear surface of the brake pad, and is provided on the caliper and presses the brake pad. A slide pin extending in a pressing direction when supporting, a support member having a guide hole for supporting the caliper and slidably receiving the slide pin, and a bush mounted on the slide pin, The inclination of the center axis of the slide pin generated with respect to the center axis of the guide hole is canceled out inside the guide hole. Characterized in that it is configured to correct the posture of the slide pin in the direction.

  According to this aspect, the bush is attached to the slide pin so as to cancel the inclination of the slide pin, and the inclination posture is corrected. By correcting the inclination of the slide pin, the sliding state of the slide pin and the guide hole is improved, and the generation of abnormal noise during sliding can be reduced. In addition, this correction is performed by the bushing and does not require processing on the guide hole side, so that the inclination correction can be easily performed.

  Further, in the above aspect, a plurality of the bushes are mounted at intervals in the axial direction of the slide pin, and each bush is configured to incline the central axis of the slide pin in a direction not parallel to the central axis of the guide hole. May be. When correcting the center axis of the slide pin inclined with respect to the center axis of the guide hole, the center axis of the slide pin may be inclined in a direction not parallel to the center axis of the guide hole. According to this aspect, it is possible to easily correct the inclination of the slide pin.

  In the above aspect, the slide pin has a plurality of bush mounting grooves for supporting the bush in the circumferential direction, and at least one bush mounting groove is offset in a predetermined direction from the center axis of the slide pin, and is annular. The bush may be supported eccentrically on the slide pin. In this case, bushes are attached to at least two locations on the base side and the tip side of the slide pin. Then, by forming the bush mounting groove offset from the center axis of the slide pin, the bush can be attached to the slide pin in an eccentric state. By inserting into the guide hole in this state, the attitude of the slide pin can be tilted in a direction that cancels the inclination of the center axis of the slide pin. According to this aspect, it is possible to easily correct the inclination of the slide pin.

  Moreover, the said aspect WHEREIN: The said bush is a cyclic | annular form which has the penetration hole which can penetrate the said slide pin, and the said penetration hole may be eccentric from the said cyclic | annular center. According to this aspect, the thickness of the bush protruding from the peripheral surface of the slide pin can be adjusted without performing characteristic processing on the slide pin, and the center axis of the slide pin is offset from the center axis of the guide hole. can do. As a result, the attitude of the slide pin can be tilted in a direction that cancels the tilt of the center axis of the slide pin. According to this aspect, it is possible to easily correct the inclination of the slide pin.

  According to the disc brake of the present invention, the inclination of the slide pin of the caliper due to the weight of the caliper on the cylinder side can be reduced only by mounting the bush on the slide pin.

  Hereinafter, an embodiment of the present invention (hereinafter referred to as an embodiment) will be described with reference to the drawings.

  The disc brake of this embodiment has a disc rotor, a brake pad that contacts the friction sliding surface of the disc rotor, and a pressing surface that is substantially parallel to the friction sliding surface of the disc rotor. And a caliper that presses the brake pad against the disc rotor. The caliper is provided with a slide pin extending in the pressing direction when the brake pad is pressed. The slide pin supports the caliper and is slidably received in the guide hole of the support member. Moreover, for example, an annular bush is attached to the slide pin. The bush is configured to correct the attitude of the slide pin in a direction that cancels the inclination of the center axis of the slide pin that occurs with respect to the center axis of the guide hole inside the guide hole. By correcting the inclination of the slide pin with the bush, the generation of abnormal noise when the slide pin slides inside the guide hole is reduced.

  1 is a side view of a floating caliper 10 constituting the disc brake 100 of the present embodiment, and FIG. 2 is a top view including a partially broken portion when the caliper 10 is viewed from the direction of arrow A in FIG. is there. As shown in FIG. 1, the caliper 10 according to the present embodiment is roughly divided into a mounting 12 that functions as a support member for fixing the caliper 10 itself to a vehicle body (not shown), and a brake that is pressed by the disc rotor to generate a braking force. A pad 14 (see FIG. 2 for the brake pad 15 on the outer side) and a cylinder portion 16 that drives the brake pad 14 are configured. As shown in FIG. 2, the caliper 10 has a piston 20 inside the cylinder portion 16. The caliper 10 has a claw portion 22 that extends from the cylinder portion 16 and faces the piston 20 with the disk rotor 18 interposed therebetween. The claw portion 22 presses and drives the brake pad 15 on the outer side. Between the cylinder part 16 and the claw part 22, brake pads 14 and 15 are arranged to face each other with a disc rotor 18 that rotates coaxially with the wheel. Friction materials 14a and 15a are fixed to the sides of the brake pads 14 and 15 facing the disc rotor 18, respectively, and back metal plates 14b and 15b are respectively attached to the sides of the brake pads 14 and 15 not facing the disc rotor 18 respectively. It is stuck. An inner side back metal 14 b of the disk rotor 18 and an outer side back metal 15 b of the disk rotor 18 are supported by the mounting 12 so as to be slidable in the axial direction of the disk rotor 18.

  The piston 20 of the cylinder portion 16 described above is disposed on the back portion of the inner side back metal 14b of the disk rotor 18. When the piston 20 is actuated to push the inner side back metal 14b, the brake pad 14 is pushed toward the inner side of the disk rotor 18 (in the direction of arrow S1 shown in FIG. 2). Further, a claw portion 22 of the caliper 10 is disposed on the back portion of the outer side back metal 14 b of the disc rotor 18. When the claw portion 22 moves and pushes the outer back metal 15b, the outer brake pad 15 is pushed toward the outer side of the disk rotor 18 (in the direction of arrow S2 shown in FIG. 2).

  The mounting 12 includes a pair of arm portions 26 in which guide holes 24 parallel to each other are formed. The caliper 10 includes a pair of caliper arms 28 extending from the cylinder portion 16 in the circumferential direction of the disk rotor 18. The caliper arm 28 is formed with pin bolt holes 32 parallel to each other for bolting the slide pin 30 to the caliper arm 28. Thereby, the slide pins 30 are respectively fixed by the pin bolts 34 toward the axial direction of the disk rotor 18. The length of the portion of the slide pin 30 that is inserted into the guide hole 24 is larger than the depth of the guide hole 24. The slide pin 30 is slidably inserted into the guide hole 24 with a predetermined gap. Accordingly, the caliper 10 is supported by the mounting 12 in a state in which the caliper 10 can slide in the axial direction of the disk rotor 18 by sliding of the slide pin 30 and the guide hole 24.

  A cylindrical pin boot (also referred to as a dust boot) 36 made of a flexible member such as rubber is attached between the base of the slide pin 30 and the open end of the guide hole 24 of the arm portion 26. An annular groove 38 is formed on the inner peripheral surface of the opening end portion of the guide hole 24, and an attachment portion 40 at one end of the pin boot 36 is fixed in the annular groove 38. An annular groove 42 is also formed on the outer periphery of the base portion of the slide pin 30, and a mounting portion 44 at the other end of the pin boot 36 is fitted in the annular groove 42. The bellows-like annular coupling portion 46 that couples the mounting portion 40 on the guide hole 24 side and the mounting portion 44 on the slide pin 30 side is thinner than both the mounting portions 40 and 44, and the slide pin 30 slides. It expands and contracts following the displacement. The sliding surface of the slide pin 30 and the guide hole 24 is covered by the annular connecting portion 46, and foreign matter such as dust and dirt is prevented from entering the sliding surface.

  The mounting 12 is formed with a concave torque receiving portion 48 as shown in FIG. Further, protrusions 50 are formed on both side surfaces of the back metal 14b. The protrusion 50 is fitted into the torque receiving portion 48 provided on the mounting 12 so that the brake pad 14 faces the disc rotor 18 even when the brake pad 14 is dragged by the disc rotor 18 during brake braking. Can be kept in position. The back metal 15b on the outer side also has a projection, and is fitted into the concave torque receiving portion of the mounting 12 and functions in the same manner.

  Further, as shown in FIG. 2, a fluid supply pipe 52 for supplying brake fluid is connected to the back side of the piston 20 disposed in the hole 51 of the cylinder portion 16, and high-pressure brake fluid is supplied when a braking request is made. The A pressing surface 20a substantially parallel to the friction sliding surface 18a of the disk rotor 18 is formed at the tip of the piston 20, and when the brake fluid is supplied, the inner side back metal 14b is pressed and moved in the arrow S1 direction. When the friction material 14a fixed to the back metal 14b is pressed against the friction sliding surface 18a of the disk rotor 18, the sliding of the piston 20 is stopped. Even after the sliding of the piston 20 stops, if the brake fluid flows into the hole 51, the hydraulic pressure in the hole 51 further increases. As the hydraulic pressure in the hole 51 increases, the entire cylinder portion 16 slides in the direction of the arrow S2. The claw portion 22 formed at the tip of the cylinder portion 16 is formed with a pressing surface 22a substantially parallel to the friction sliding surface 18a of the disk rotor 18 so that the outer side backing metal 15b can be pressed. That is, when the cylinder portion 16 slides in the direction of the arrow S2, the friction material 15a is pressed against the friction sliding surface 18a of the disc rotor 18 via the outer side backing metal 15b. As a result, the disk rotor 18 is pressed and clamped by the pair of friction materials 14a and 15a, and the disk rotor 18 can be braked efficiently.

  Incidentally, the disc brake caliper 10 of the present embodiment has a function of operating as a parking brake (PKB). When the disc brake is used as a service brake, the brake fluid is supplied from the fluid supply pipe 52 to drive the piston 20 as described above. On the other hand, when the disc brake is used as the PKB, for example, the cam in the PKB unit 54 is rotated by pulling the PKB wire 56 connected to the PKB unit 54 disposed on the back side of the cylinder portion 16 and pushed. The rod 58 is advanced. As the push rod 58 advances, the piston 20 is moved in the direction of the arrow S1, and the brake pad 14 is pressed against the disc rotor 18. Then, the cylinder portion 16 slides in the direction of the arrow S2 in the same manner as when the piston 20 is driven by the brake fluid, and the brake pad 15 is pressed against the disc rotor 18. As a result, the disc rotor 18 is sandwiched between the brake pads 14 and 15 to generate a static force that maintains the disc rotor 18 in a static state. Such a PKB integrated caliper is sometimes called a built-in disc brake.

  The caliper 10 configured as described above is mounted on the vehicle with the arrow T direction facing upward, for example. In this case, the center of gravity of the caliper 10 is biased toward the inner side (the side where the piston 20 is present) from the disk rotor 18 due to the weight of the cylinder portion 16 and the PKB unit 54, and the caliper 10 may be tilted in the direction of arrow W. .

  As described above, since the cylinder portion 16 slides with respect to the mounting 12, the guide hole 24 and the slide pin 30 are fitted in a loosely fitted state having a predetermined clearance. In this case, ideally, it is desirable that the central axis 30a of the slide pin 30 and the central axis 24a of the guide hole 24 coincide with each other as shown in FIG. However, as described above, the caliper 10 is inclined in the direction of the arrow W in FIG. 2 due to the weight of the cylinder portion 16 and the PKB unit 54, so that the slide pin 30 is rotated in the direction of the arrow W as shown in FIG. Accordingly, the central axis 30 a is inclined with respect to the central axis 24 a of the guide hole 24. If the slide pin 30 slides inside the guide hole 24 in this posture, it may cause abnormal noise during braking operation. Therefore, in the present embodiment, as shown in FIG. 3C, when the caliper 10 is inclined due to the weight of the cylinder portion 16 or the PKB unit 54 and the slide pin 30 is inclined, the slide pin 30 is moved in a direction to cancel the inclination. A bush 60 configured to correct the posture is attached to the slide pin 30. Specifically, as shown in FIG. 4A to FIG. 4D, the slide is performed such that the center of the bush 60 is offset in the direction opposite to the direction of correction with respect to the central axis 30 a of the slide pin 30. Attach to pin 30. At this time, since the inclined slide pin 30 as shown in FIG. 3B tries to rotate in the direction of arrow W, the slide pin 30 on the tip M side of the slide pin 30 as shown in FIG. The posture is corrected so as to be pushed down in the direction of arrow D, and the posture is corrected so that the slide pin 30 is pushed up in the direction of arrow U on the base N side of the slide pin 30. The bush 60 is preferably an elastic body such as rubber. In addition, it is desirable to consider so that the slide pin 30 slides smoothly in the guide hole 24. For example, the surface of the bush 60 may be coated with a coating that improves slidability, or the bush 60 may contain a material that improves slidability.

  When the posture is corrected so that the slide pin 30 is pushed down in the direction of arrow D in FIG. 3C, as shown in FIGS. 4A and 4B, on the tip M side of the slide pin 30, the slide pin 30 A thick portion of the bush 60 protruding from the surface of the slide 30 may be thickened on the side (D1) above the center axis 30a of the slide pin 30 and thin on the side (D2) below the center axis 30a. Similarly, when the posture is corrected so as to push up the slide pin 30 in the direction of the arrow U, the surface of the slide pin 30 on the root N side of the slide pin 30 as shown in FIGS. 4 (c) and 4 (d). The thick portion of the bush 60 protruding from the sliding pin 30 may be made thinner on the upper side (U1) than the central shaft 30a and thicker on the lower side (U2) than the central shaft 30a. 4B is a cross section taken along line P-P in FIG. 4A, and FIG. 4D is a cross section taken along line QQ in FIG. 4C. As shown in FIGS. 4A to 4D, means for changing and adjusting the protruding amount of the thickness of the bush 60 on the upper side and the lower side across the central axis 30a of the slide pin 30 are shown in FIGS. Thus, the formation position of the bush mounting groove 62 for fixing and supporting the bush 60 to the slide pin 30 may be offset in the direction opposite to the direction in which the center axis 30a of the slide pin 30 is corrected. 4 (a) and 4 (b), the bush mounting groove 62 on the side (D1) above the center axis 30a of the slide pin 30 is shallow, and the bush mounting groove 62 on the side (D2) below the center axis 30a. The center of the bush mounting groove 62 is offset to the D1 side with respect to the center axis 30a of the slide pin 30 so as to be deeper. Similarly, in the case of FIG. 4C and FIG. 4D, the bush mounting groove 62 on the upper side (U1) from the center shaft 30a of the slide pin 30 is deep and the bush mounting on the lower side (U2) from the central shaft 30a. The center of the bush mounting groove 62 is offset to the U2 side with respect to the central axis 30a of the slide pin 30 so that the groove 62 becomes shallow.

  In this way, by inserting the slide pin 30 into the guide hole 24 with a plurality of, for example, two bushes 60 offset and mounted at intervals in the axial direction of the slide pin 30, the central axis of the slide pin 30 can be obtained. The posture of the slide pin 30 can be corrected in a direction that cancels the inclination of 30a. As a result, when the caliper 10 is mounted on the vehicle, the inclination of the slide pin 30 caused by the weight of the cylinder portion 16 and the PKB unit 54 is suppressed, and the relationship between the slide pin 30 and the guide hole 24 is shown in FIG. ). And generation | occurrence | production of the abnormal noise at the time of sliding of the slide pin 30 can be reduced. Moreover, the sliding of the slide pin 30 can be made smooth. In addition, as described above, the inclination correction of the slide pin 30 can be performed only by the bush 60, and there is no need to add a structure for suppressing the inclination, so there is a disadvantage due to the occurrence of play at the time of assembly and the increase in the number of parts. There is no need to consider.

  Further, in this case, since the posture correction of the slide pin 30 can be performed by processing the slide pin 30 that is easier to process than the guide hole 24, it is possible to contribute to the reduction of the manufacturing cost. Further, by eccentrically processing the bush mounting groove 62, it is possible to use a standard annular bush 60 having the same wall thickness on the entire circumference, which can contribute to cost reduction.

  3A to 3C and FIGS. 4A to 4D are directions in which the slide pin 30 is inclined with respect to the guide hole 24 and the inclination is canceled by the bush 60. In order to explain the state of correction, the size of the clearance between the slide pin 30 and the guide hole 24 is exaggerated. This clearance is actually very small, the clearance is about 0.1 to 0.5 mm, and the inclination of the slide pin 30 is, for example, 1 ° or less.

  In the above case, the example in which the bush mounting groove 62 of the slide pin 30 is eccentric is shown. However, as shown in FIG. 5, the eccentric bush in which the insertion hole 64a formed in the annular bush is eccentric from the annular center. 64 may be used. In this case, the bush mounting groove 62 of the slide pin 30 has the same depth all around the slide pin 30, and the thickness H1 side of the eccentric bush 64 is set to the D1, U2 side of FIG. 3 (c) may be set to the D2 and U1 sides, and the same effect as when the bush mounting groove 62 is eccentric can be obtained.

  In the above-described example, two bushes 60 are used to correct the inclination of the slide pin 30. However, as shown in FIGS. 6 (a) and 6 (b), the mounting portion 40 of the pin boot 36 is used. The wall thickness may be changed on the upper U1 side and the lower U2 side of the central axis 30a of the slide pin 30. In addition, FIG.6 (b) is a cut surface at the time of cutting along the line segment CC of Fig.6 (a). In this case, the mounting portion 40 of the pin boot 36 has the function of the bush 60 on the base N side of the slide pin 30. In other words, the bush 60 on the base N side of the slide pin 30 is formed by the mounting portion 40. By providing the mounting portion 40 with the function of the bush 60, the number of bushes 60 used can be substantially reduced, and the number of assembly steps can be reduced. As shown in FIG. 2, when two bushes 60 are attached to the slide pin 30, the bush 60 on the base side of the slide pin 30 prevents dust and foreign matter from entering the sliding portion of the slide pin 30. can do. For this reason, it is also possible to omit the pin boot 36, which can contribute to the reduction in the number of parts and the number of assembly steps.

  The bush 60 shown in the present embodiment may be attached to each of the two slide pins 30 provided in the caliper 10 or may be attached to any one of the slide pins 30. When the bush 60 is attached only to one slide pin 30, the slide pin 30 on the side where the bush 60 is not attached is provided with a large clearance between the guide hole 24 and the posture correction operation on the side where the bush 60 is provided. It is desirable not to disturb.

  In the above-described embodiment, the example in which the two bushes 60 are mounted on the slide pin 30 has been shown. However, if the posture of the slide pin 30 can be corrected in a direction that cancels the inclination of the central axis 30a of the slide pin 30, the bush 60 can be corrected. The number of attachments is arbitrary. For example, three or more bushes 60 may be attached to counter the weight of the cylinder part 16 or the PKB unit 54 according to the magnitude of the inclination due to the weight of the cylinder part 16 or the PKB unit 54. Further, only a part of the plurality of bushes 60 to be mounted may be eccentric using the bush mounting groove 62 or the eccentric bush 64 as described above, and the rest may not be eccentric. In this case, the degree of inclination correction of the slide pin 30 can be adjusted. The degree of inclination correction of the slide pin 30 can also be adjusted by the mounting position of the bush 60 on the slide pin 30. By these adjustments, it is possible to easily cope with the caliper 10 having a different inclination amount for each model. In the present embodiment, an annular bush that can be inserted into the slide pin 30 is illustrated as the bush 60. However, the configuration of the bush is arbitrary as long as the bush can be attached to the slide pin 30 and the inclination can be corrected. For example, a block-like bush may be attached to a part of the slide pin 30, and the same effect as in the present embodiment can be obtained.

  Further, in the present embodiment, the built-in disc brake, in which the caliper 10 is easily tilted, has been exemplified and described. However, even in a general floating caliper (single piston type, double piston type, etc.) that does not include the PKB unit 54, if the same inclination as in the present embodiment occurs due to the weight of the cylinder portion 16, the bush 60 is used. It can be used to correct posture and the same effect can be obtained.

  The present invention is not limited to the above-described embodiments, and various modifications such as design changes can be added based on the knowledge of those skilled in the art. The configuration shown in each figure is for explaining an example, and any configuration that can achieve the same function can be changed as appropriate, and the same effect can be obtained.

1 is an external view of a disc brake according to the present embodiment. FIG. 2 is a top view of the disc brake according to the present embodiment as viewed from the direction of arrow A in FIG. 1. It is explanatory drawing explaining the inclination direction of the slide pin of the disc brake which concerns on this embodiment, and the direction to correct. It is explanatory drawing explaining the bush which corrects the inclination of the slide pin of the disc brake which concerns on this embodiment. It is explanatory drawing explaining the other shape of the bush which corrects the inclination of the slide pin of the disc brake which concerns on this embodiment. It is sectional drawing which shows the example which gave the function of the bush which corrects the inclination of the slide pin of the disc brake which concerns on this embodiment to the attaching part of the pin boot.

Explanation of symbols

  10 Caliper, 12 Mounting, 14, 15 Brake pad, 14a, 15a Friction material, 14b, 15b Back metal, 16 Cylinder part, 18 Disc rotor, 18a Friction sliding surface, 20 Piston, 22 Claw part, 24 Guide hole, 26 Arm Part, 28 caliper arm, 30 slide pin, 36 pin boot, 38, 42 annular groove, 40, 44 mounting part, 46 annular connecting part, 54 PKB unit, 56 PKB wire, 58 push rod, 60 bushing, 62 bushing mounting groove, 64 Eccentric bush, 100 Disc brake.

Claims (4)

A disk rotor that rotates with the wheels of the vehicle;
A brake pad disposed relative to the friction sliding surface of the disk rotor;
A caliper having a pressing surface substantially parallel to the friction sliding surface of the disk rotor, and pressing the brake pad against the disk rotor by bringing the pressing surface into contact with the back surface of the brake pad;
A slide pin provided in the caliper and extending in a pressing direction when pressing the brake pad;
A support member having a guide hole for supporting the caliper and slidably receiving the slide pin;
A bush mounted on the slide pin;
Including
The bush is configured to correct the posture of the slide pin in a direction to cancel the inclination of the center axis of the slide pin generated with respect to the center axis of the guide hole inside the guide hole. Disc brake. A plurality of the bushes are mounted at intervals in the axial direction of the slide pin,
2. The disc brake according to claim 1, wherein each bush tilts the central axis of the slide pin in a direction not parallel to the central axis of the guide hole.   The slide pin has a plurality of bush mounting grooves for supporting the bush in the circumferential direction, and at least one bush mounting groove is offset in a predetermined direction from a center axis of the slide pin, and an annular bush is attached to the slide pin. 3. The disc brake according to claim 2, wherein the disc brake is supported in an eccentric state.   3. The disc brake according to claim 2, wherein the bush has an annular shape having an insertion hole through which the slide pin can be inserted, and the insertion hole is eccentric from the center of the annular shape.

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