JP2007064401A - Disk brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the workability at the time of setting by providing a guide part which adjusts a position of the setting part when setting a caliper to a bracket. <P>SOLUTION: A main pin 16 is provided with a main pin setting part 3 of a bracket 1 and a sub pin 17 is provided with a sub pin setting part 4. A caliper 9 is supported movably by these pins 16, 17. A guide part 20 is provided on the sub pin setting part 4. The caliper 9 is turned about the main pin 16 in the condition where the sub pin 17 is removed, when doing the replacement work of the assembly work of a brake and a friction pad 12 and the like. At this time, the guide part 20 guides a collar 18 toward the sub pin setting part 4 so that the collar 18 on the side of the caliper 9 is axially aligned with the sub pin setting part 4. Herewith, the caliper 9 can be set on the bracket 1 effectively by turning. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disc brake that is preferably used to apply a braking force to a vehicle such as an automobile or a two-wheeled vehicle.

  In general, a disc brake is roughly constituted by a bracket attached to a non-rotating part of a vehicle, a caliper supported so as to be movable by the bracket, and a pair of friction pads pressed against both sides of the disc by the caliper. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 7-139666

  A conventional disc brake of this type is configured to support a caliper movably in the axial direction of the disc, for example, by two pins called a main pin and a sub pin. For this reason, the main pin attachment part and the sub pin attachment part are provided in the bracket.

  Further, the caliper is provided with a main pin insertion portion at a position overlapping with the main pin attachment portion of the bracket as viewed from the direction along the axis of the disk, and a sub pin insertion portion is provided at a position overlapping with the sub pin attachment portion. These pin insertion portions are formed as boss portions.

  The main pin is attached to the main pin attachment portion of the bracket via the main pin insertion portion of the caliper, and the sub pin is similarly attached to the sub pin attachment portion via the sub pin insertion portion of the caliper. For this reason, when the brake is operated, the caliper can move (slide) in the axial direction of the disc along the main pin and the sub pin, and the friction pad is pressed against both sides of the disc.

  Further, in the conventional disc brake, the caliper is rotated around the main pin with the sub-pin removed, for example, the brake assembly operation or the friction pad replacement operation is performed.

  In this case, for example, in the assembly work of the brake, the bracket and the caliper are first connected by the main pin. Then, the caliper is rotated so as to be lifted from the bracket around the main pin, thereby moving the sub-pin insertion portion of the caliper away from the sub-pin mounting portion of the bracket. As a result, the pad mounting portion of the bracket covered with the caliper is exposed, and the friction pad is assembled to the pad mounting portion.

  Next, the caliper is rotated so as to cover the friction pad, thereby aligning the caliper with the sub-pin insertion portion of the caliper and the sub-pin mounting portion of the bracket. And a brake can be assembled by connecting these sub pin insertion parts and a sub pin attaching part with a sub pin.

  By the way, in the above-described prior art, for example, when performing a brake assembly operation, a friction pad replacement operation, or the like, the caliper is rotated around the main pin. In this case, if the bracket and the caliper are in a predetermined positional relationship with respect to the axial direction, the sub-pin insertion portion and the sub-pin mounting portion are held at different positions in the axial direction. Can do.

  However, since the main pin supports the caliper so as to be movable in the axial direction, the axial position of the caliper may shift in a direction close to the bracket along the main pin. In this state, the caliper is rotated. When moved, the sub-pin insertion part and the sub-pin attachment part may interfere with each other in the rotation direction.

  For this reason, in the prior art, when performing brake assembly work, friction pad replacement work, etc., the sub-pin insertion part and the sub-pin attachment part can be smoothly overlapped due to the displacement of the caliper in the axial direction. Therefore, there is a problem that work efficiency is lowered. Further, the interference between the sub-pin insertion part and the sub-pin attachment part causes a problem that the outer surfaces of both parts are scratched or other parts attached to these parts are damaged.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to easily align the sub-pin insertion portion and the sub-pin mounting portion when rotating the caliper around the main pin. Another object of the present invention is to provide a disc brake capable of smoothly performing brake assembly work, friction pad replacement work, and the like.

  In order to solve the above-described problems, the present invention provides a bracket having a main pin mounting portion and a sub pin mounting portion, and a main pin insertion portion and a sub pin insertion portion corresponding to the main pin mounting portion and the sub pin mounting portion of the bracket. A caliper having a pair of friction pads pressed on both sides of the disk by the caliper, a main pin attached to the main pin attachment portion of the bracket via the main pin insertion portion of the caliper, and the sub-pin insertion portion. And is applied to a disc brake having a sub pin attached to the sub pin mounting portion and supporting the caliper so as to be movable in the axial direction of the disc together with the main pin.

  A feature of the configuration adopted by the invention of claim 1 is that either of the sub-pin mounting portion of the bracket and the sub-pin insertion portion of the caliper is centered on the main pin with the sub-pin removed. As described above, when the caliper is rotated, a guide portion that guides the sub-pin insertion portion toward the sub-pin mounting portion is provided.

  According to a second aspect of the present invention, the sub pin insertion portion of the caliper is inserted into a pin insertion hole provided in the caliper so as to be movable in the axial direction, and an end surface thereof is in contact with the sub pin mounting portion of the bracket. The sub-pin is inserted into the collar and attached to the sub-pin mounting portion, and the guide portion is a tapered surface that matches the axial position of the collar with the sub-pin mounting portion before the sub-pin is attached. It is configured as.

  According to the invention of claim 3, the outer peripheral side of the collar is provided with a protective boot in which a portion near the sub-pin mounting portion of the bracket is a substantially conical expansion and contraction portion, and the inclination angle of the guide portion is It is set as the angle set smaller than the inclination | tilt angle of the virtual line along the outline of the expansion-contraction part of the said protective boot.

  According to the first aspect of the present invention, for example, when performing a brake assembly operation or a friction pad replacement operation, the caliper can be rotated around the main pin with the sub-pin removed. First, the case where the guide portion is provided in the sub-pin mounting portion of the bracket will be described. When the sub-pin insertion portion of the caliper is rotated, this guide portion is replaced with the sub-pin mounting portion of the bracket. It is possible to guide toward the overlapping position.

  As a result, even if the caliper is misaligned in the axial direction of the disc with respect to the bracket, this misalignment can be easily corrected by the guide portion, and the sub-pin insertion portion and the sub-pin mounting portion can be aligned smoothly. can do. For this reason, when the caliper is rotated and assembled to the bracket, it is possible to reliably prevent the sub-pin insertion portion and the sub-pin mounting portion from interfering with each other due to the displacement.

  Therefore, the work of assembling the brake, the work of replacing the friction pad, and the like can be performed smoothly, and these workability can be improved. In addition, the interference between the sub-pin insertion part and the sub-pin mounting part can prevent the outer surface of both parts from being scratched and other parts attached to these parts from being damaged. Can increase the sex.

  On the other hand, even when the guide portion is provided in the sub pin insertion portion of the caliper, the guide portion can guide the sub pin insertion portion toward a position overlapping the sub pin mounting portion of the bracket. For this reason, it is possible to obtain substantially the same operational effects as when the guide portion is provided in the sub-pin mounting portion of the bracket.

  According to the second aspect of the present invention, the guide portion can be formed as a tapered surface inclined in the axial direction of the disk, for example. Accordingly, when the caliper is rotated, the axial position of the collar inserted through the pin insertion hole can be adjusted to the sub-pin mounting portion of the bracket by the guide portion. For this reason, when the caliper is rotated and assembled to the bracket, the caliper position deviation with respect to the bracket and the collar position deviation with respect to the caliper can be corrected by the guide portion, and the caliper can be assembled efficiently. it can.

  According to the invention of claim 3, the inclination angle of the guide portion can be made smaller than the inclination angle of the imaginary line along the contour (outline profile) of the stretchable portion of the protective boot. Thereby, for example, when the collar displaced in the axial direction comes close to the guide portion, the end portion side of the collar can be brought into contact with the guide portion before the expansion / contraction portion of the protective boot contacts the guide portion.

  And the clearance of the angle corresponding to the difference of these inclination angles can be ensured between the expansion-contraction part and guide part of a protective boot. For this reason, when the collar is displaced and close to the guide portion, it is possible to reliably prevent the protective boot from coming into contact with the guide portion or being sandwiched between the guide portion and the collar. . Therefore, when the caliper is assembled, the work can be performed smoothly without damaging the protective boot, and the workability during assembly and the reliability of the brake can be improved.

  Hereinafter, as a disc brake according to an embodiment of the present invention, a motorcycle brake will be described as an example and described in detail with reference to FIGS.

  Reference numeral 1 denotes a bracket that is integrally attached to a non-rotating portion (not shown) of the vehicle. The bracket 1 is formed by using a casting means such as an aluminum die cast, and is disposed in the vicinity of a disk D that rotates together with wheels. Has been. In this case, for example, the disk D rotates in the forward direction (the direction of arrow A in FIG. 1) when the vehicle moves forward, and rotates in the opposite direction when the vehicle moves backward.

  2 to 4, for example, the bracket 1 is provided on the outer arrangement portion 2 that is positioned on the outer side of the disk D and is attached to the vehicle body, and on the outer arrangement portion 2, and a main pin 16 to be described later is provided. The main pin mounting portion 3 to be mounted, the sub pin mounting portion 4 to which the below-described sub pin 17 is mounted, and the inner layout extending from the outer positioning portion 2 to the inner side across the outer peripheral side of the disk D. The portion 5, and a pad guide groove 6, torque receiving portions 7 and 8, and a guide portion 20 described later are roughly configured.

  Here, the sub-pin mounting portion 4 is disposed at a position spaced apart from the main pin mounting portion 3 in the rotational direction and the radial direction of the disk, and on the substantially opposite side of the main pin mounting portion 3 with a caliper 9 described later interposed therebetween. Has been placed. Further, the sub-pin mounting portion 4 is formed as a boss portion as shown in FIG. 5, and a screw hole 4A extending in the axial direction of the disk D is provided on the inner peripheral side thereof.

  In addition, an annular collar contact surface 4 </ b> B with which a later-described collar 18 contacts is provided on the end surface of the sub-pin mounting portion 4. The collar contact surface 4B is formed as a flat surface perpendicular to the axial direction of the disk D, for example, and surrounds the screw hole 4A. Further, a guide portion 20 is projected from the outer peripheral surface 4 </ b> C side of the sub-pin mounting portion 4.

  6 shows a pair of pad guide grooves (only the outer side is shown) provided in the outer placement portion 2 and the inner placement portion 5 of the bracket 1 respectively. These pad guide grooves 6 are arranged on both sides in the axial direction across the disk D, and guide the inner and outer friction pads 12, 12 described later in the axial direction of the disk D.

  Here, as shown in FIGS. 1 and 4, the pad guide groove 6 is formed, for example, as a concave groove that is recessed in the substantially radial direction of the disk D, and extends in the axial direction of the disk D. Further, the outer placement portion 2 and the inner placement portion 5 of the bracket 1 are respectively provided with torque receiving portions 7 and 8 formed by the peripheral wall of the pad guide groove 6.

  In this case, the first torque receiving portion 7 receives the braking torque from the ear portion 14C of the friction pad 12 (back metal 14) when the disk D is rotating in the forward direction. Further, the second torque receiving portion 8 receives the braking torque from the ear portion 14C when the disk D is rotating in the reverse direction.

  A caliper 9 is movably supported by the bracket 1. The caliper 9 includes an outer leg portion 9A disposed on the outer side of the disc D and a disc from the outer leg portion 9A as shown in FIGS. A bridge portion 9B extending to the inner side across the outer peripheral side of the wire, an inner leg portion 9C extending radially inward from the distal end side of the bridge portion 9B, and an arm portion protruding from the bridge portion 9B of the caliper 9, for example 9D, another arm portion 9E protruding from the outer leg portion 9A, and a pair of pad support arms 9F, 9G protruding from the outer leg portion 9A and the inner leg portion 9C and facing each other, for example. ing.

  Here, a cylinder hole 10 is formed in the outer leg portion 9A of the caliper 9 as shown in FIG. 3, and a piston 11 is slidably inserted into the cylinder hole 10. Moreover, one arm part 9D among the arm parts 9D and 9E constitutes a main pin insertion part through which a main pin 16 described later is inserted, and is formed as a boss part having a pin insertion hole.

  The arm portion 9D protrudes from the bridge portion 9B toward the rotation direction exit side of the disk D (in the direction of arrow A in FIG. 1). In this case, as shown in FIG. 2, the arm portion 9D is disposed at a position corresponding to the main pin mounting portion 3 of the bracket 1, that is, a position overlapping the main pin mounting portion 3 when viewed from the direction along the axis of the disk D. ing.

  The other arm portion 9E is formed as a boss portion that constitutes a sub-pin insertion portion together with a collar 18 described later, and a pin insertion hole 9H is provided on the inner peripheral side thereof. For example, the arm portion 9E protrudes from the outer leg portion 9A in a direction close to the rotation direction entrance side of the disk D, and is disposed at a position overlapping the sub-pin mounting portion 4 of the bracket 1 when viewed from the direction along the axis of the disk D. ing.

  The two arm portions 9D and 9E configured as described above are supported so as to be movable in the axial direction of the disk D by a main pin 16 and a sub pin 17 which will be described later. When the brake fluid is supplied into the cylinder hole 10 during the operation of the brake, the piston 11 slides and presses the outer friction pad 12 against the disk D. As a result, the caliper 9 slides and displaces to the outer side due to the reaction force from the piston 11 and presses the inner friction pad 12 against the disk D by the inner leg portion 9C.

  Reference numeral 12 denotes a pair of friction pads respectively arranged on the outer side and the inner side of the disk D. Each friction pad 12 applies a braking force to the disk D from both sides. As shown in FIG. The lining 13 is in sliding contact with the surface of D, and the back metal 14 is fixed to the back surface of the lining 13.

  Here, the back metal 14 is formed in a substantially fan shape extending in the rotation direction of the disk D, and on the one side in the length direction of the back metal 14 (in the rotation direction entrance side of the disk D), as shown in FIGS. A mounting arm portion 14A is projected. The mounting arm portion 14A is provided with a long hole 14B extending substantially in the circumferential direction of the disk D, and a pad support pin 15 described later is inserted into the long hole 14B.

  Further, on the other side in the length direction of the back metal 14 (the exit side in the rotation direction of the disk D), for example, an ear part 14C formed as a substantially T-shaped protrusion protrudes. The braking torque applied to the friction pad 12 is transmitted to the torque receiving portions 7 and 8 of the bracket 1. In this case, the ear portion 14C is inserted into the pad guide groove 6 of the bracket 1 via a pad guide member 21 described later, and is elastically pressed toward the pad guide groove 6 by the pad pressing portion 21A or the like.

  Reference numeral 15 denotes a pad support pin attached between the pad support arms 9F and 9G of the caliper 9. The intermediate portion in the longitudinal direction of the pad support pin 15 is the length of the back metal 14 of each friction pad 12 as shown in FIG. Each is inserted into the hole 14B. The pad support pins 15 support one side of each friction pad 12 in the lengthwise direction so that the friction pad 12 can move in the rotational direction and the axial direction of the disk D, and braking torque applied from the disk D to the friction pad 12 is applied to the caliper 9. To prevent transmission.

  Reference numeral 16 denotes a main pin formed by, for example, a bolt or the like. The main pin 16 cooperates with a later-described sub pin 17 to support the caliper 9 so as to be movable in the axial direction of the disk D. The main pin 16 is slidably inserted into the arm portion 9D of the caliper 9, and the bracket 1 It is attached to the main pin attaching part 3 of the.

  Here, for example, when performing assembly work of the brake, replacement work of the friction pad 12, etc., the caliper 9 is rotated around the main pin 16 with the sub pin 17 removed as shown in FIGS. It has a configuration.

  Reference numeral 17 denotes a sub-pin disposed on the opposite side of the main pin 16 with the caliper 9 interposed therebetween. As shown in FIG. 5, the sub-pin 17 is inserted into a pin insertion hole 9H of the arm portion 9E of the caliper 9 through a collar 18 which will be described later, and is screwed into the screw hole 4A of the sub-pin attachment portion 4 of the bracket 1. It has been.

  Reference numeral 18 denotes a collar which is inserted into the pin insertion hole 9H of the caliper 9 so as to be movable in the axial direction. The collar 18 constitutes a sub-pin insertion portion of the caliper 9, and is formed by a cylindrical metal sleeve or the like, for example. Has been. The collar 18 extends in the axial direction of the disk D along the pin insertion hole 9H, and both sides in the axial direction protrude outward from the pin insertion hole 9H.

  A sub pin 17 is inserted on the inner peripheral side of the collar 18. The collar 18 is clamped between the head of the sub-pin 17 and the collar contact surface 4B of the sub-pin mounting portion 4 and attached to the bracket 1. In this state, one end surface 18A of the collar 18 is in contact with the collar contact surface 4B of the sub-pin mounting portion 4. Further, on both sides in the axial direction of the collar 18, as shown in FIG. 5, annular grooves 18 </ b> B and 18 </ b> C for mounting a protective boot 19 described later are formed.

  Reference numeral 19 denotes a protective boot provided by being fitted on the outer peripheral side of the collar 18. The protective boot 19 is formed as a cylindrical body that can be elastically deformed by, for example, a resin material, rubber, or the like. And the outer peripheral surface of the collar 18 to protect these sliding surfaces.

  The protective boot 19 is provided in a cylindrical portion 19A disposed in the pin insertion hole 9H of the caliper 9 and is extendable on one side in the axial direction of the cylindrical portion 19A, and is attached to one annular groove 18B of the collar 18. The substantially conical expansion / contraction part 19B and the other expansion / contraction part 19C attached to the other annular groove 18C of the collar 18 are provided on the other side in the axial direction of the cylindrical part 19A.

  In this case, the cylindrical portion 19 </ b> A slides along the outer peripheral side of the collar 18 together with the arm portion 9 </ b> E of the caliper 9 when the caliper 9 moves in the axial direction along the sub pin 17. The extension part 19B on one side in the axial direction is formed in a bellows shape and is located outside the pin insertion hole 9H and in the vicinity of the sub-pin attachment part 4 of the bracket 1, and attached to the sub-pin from the arm part 9E side of the caliper 9 The diameter is reduced to a substantially conical shape toward the portion 4.

  Here, when the caliper 9 is rotated around the main pin 16, the sub-pin 17 is removed, so that the arm 9E (pin insertion hole 9H) of the caliper 9 has a collar as shown in FIG. 18 and the protective boot 19 are inserted in a state of being movable in the axial direction.

  In this state, for example, when the collar 18 is displaced to the other side in the axial direction within the pin insertion hole 9H and the protruding dimension of the collar 18 protruding to the sub-pin mounting portion 4 side becomes the smallest, as shown in FIG. The stretchable part 19B of the boot 19 is deformed into a flat and substantially conical shape. At this time, if the virtual line along the contour (outer profile) of the conical surface of the expansion / contraction part 19B is L1, the virtual line L1 is the color contact surface 4B (or the color contact surface 4B) of the sub-pin mounting portion 4. Inclined by an inclination angle θ1 with respect to the parallel reference line S). In this case, the reference line S is set as a straight line perpendicular to the axial direction of the disk D, for example, in substantially the same manner as the collar contact surface 4B.

  On the other hand, when the collar 18 is displaced to one side in the axial direction within the pin insertion hole 9H and the protruding dimension of the collar 18 protruding to the sub-pin mounting portion 4 side becomes the largest, as shown in FIG. The stretchable portion 19B is deformed into a substantially conical shape with a sharp point. At this time, if an imaginary line along the contour of the conical surface of the expansion / contraction part 19B is L2, the imaginary line L2 is inclined with respect to the reference line S by an inclination angle θ2. The inclination angle θ2 is larger than the inclination angle θ1 described above.

  Next, reference numeral 20 denotes, for example, a guide portion provided on the sub-pin mounting portion 4 of the bracket 1. When the caliper 9 is rotated around the main pin 16 with the sub pin 17 removed, the guide portion 20 attaches the collar 18 assembled on the caliper 9 side to the sub pin mounting portion 4 (color abutment) of the bracket 1. It is guided in the axial direction of the disk D towards the surface 4B).

  Thereby, even when the caliper 9, the collar 18, and the like are displaced in the axial direction of the disk D with respect to the bracket 1, for example, the guide unit 20 corrects these displacements when the caliper 9 is rotated. The collar 18 is smoothly placed on the collar contact surface 4B of the sub-pin mounting portion 4.

  Here, the guide portion 20 is formed, for example, as a protrusion protruding radially outward from the outer peripheral surface 4C of the sub-pin mounting portion 4, and the protruding direction is, for example, a sub-pin mounting centering on the main pin 16 as shown in FIG. It is substantially along an arc R passing through the center of the screw hole 4A of the portion 4.

  The guide portion 20 has a tapered surface 20A that extends radially outward from the collar contact surface 4B of the sub-pin mounting portion 4 and is inclined obliquely toward the axial direction of the disk D (the direction away from the collar 18). is doing. The tapered surface 20A has a constant inclination angle θ0 with respect to the collar contact surface 4B (or the reference line S described above) of the sub-pin mounting portion 4 as shown in FIGS.

  The inclination angle θ 0 is, for example, the inclination angle θ 1 of the protective boot 19 when the collar 18 is most displaced to the side opposite to the sub-pin mounting portion 4 and the protective boot when the collar 18 is most displaced to the sub-pin mounting portion 4 side. With respect to 19 inclination angles θ2, these angles are set smaller than these inclination angles θ1 and θ2 (θ0 <θ1 <θ2).

  As a result, when the caliper 9 is rotated, even if the collar 18 is displaced in the axial direction, the end of the collar 18 is moved before the expansion / contraction part 19B of the protective boot 19 contacts the tapered surface 20A of the guide part 20. The part side can be brought into contact with the tapered surface 20A. At this time, a clearance θc having an angle corresponding to the difference between the inclination angles θ1 and θ2 of the expansion / contraction portion 19B and the inclination angle θ0 of the taper surface 20A is always between the expansion / contraction portion 19B and the tapered surface 20A of the protective boot 19. Secured. For this reason, the guide part 20 can push only the collar 18 in the axial direction and guide it on the collar contact surface 4B without contacting the protective boot 19.

  In FIG. 1, reference numeral 21 denotes a pad guide member provided in the pad guide groove 6 of the bracket 1 or the like. This pad guide member 21 guides the ears 14C of each friction pad 12 (back metal 14) along the pad guide groove 6 in the axial direction of the disk D, and the ears 14C of the back metal 14 into the pad guide grooves 6. It has a pad presser 21A that elastically presses it toward.

  The disc brake according to the present embodiment has the above-described configuration. Next, the assembly work of the brake will be described with reference to FIGS.

  First, when assembling the brake, as shown in FIG. 6, the friction pad 12, the pad guide member 21 and the like are assembled to the bracket 1. In addition, the caliper 9 is rotatably attached to the main pin mounting portion 3 of the bracket 1 using the main pin 16.

  Then, as shown in FIGS. 6 and 7, the arm 9E of the caliper 9 is moved to the bracket 1 by rotating the caliper 9 around the main pin 16 in the arrow B direction so as to cover the friction pad 12 and the like. It is moved toward the sub-pin mounting portion 4.

  Here, when the caliper 9, the collar 18, etc. are at predetermined axial positions with respect to the bracket 1, as shown in FIG. 9, these portions can be rotated to positions that overlap with the sub-pin mounting portion 4 of the bracket 1. The collar 18 and the screw hole 4A of the sub-pin mounting portion 4 can be arranged coaxially. In this state, the brake can be assembled by inserting the sub pin 17 into the collar 18 and screwing it into the screw hole 4A.

  On the other hand, for example, when the caliper 9 is displaced in the axial direction along the main pin 16 or when the collar 18 is displaced in the axial direction within the pin insertion hole 9H of the caliper 9, as shown in FIGS. The collar 18 may have moved to a position where it interferes with the sub-pin mounting portion 4.

  However, in this case, the arm portion 9E of the caliper 9 is rotated in the direction indicated by the arrow B, so that the collar 18 first contacts the tapered surface 20A of the guide portion 20. The collar 18 is guided in the direction of arrow C along the taper surface 20 </ b> A by the arm portion 9 </ b> E being further rotated in the direction of arrow B, and directed toward the collar contact surface 4 </ b> B of the sub-pin mounting portion 4. Thus, sliding displacement is performed on the tapered surface 20A.

  As a result, the end face 18A can be brought into contact with the collar contact face 4B as shown in FIG. 9 while correcting the positional deviation of the collar 18, so that the collar 18 and the sub-pin mounting portion 4 are aligned. In this state, the sub pin 17 can be attached to assemble the disc brake.

  Further, for example, when the caliper 9 is rotated in the replacement work of the friction pad 12 or the like, the position of the collar 18 is corrected by the guide portion 20 and the work is efficiently performed as in the case of the assembly work described above. It can be carried out.

  Next, the operation of the disc brake will be described. First, when the brake is operated while the vehicle is running, the brake fluid pressure is supplied into the cylinder hole 10 of the caliper 9, and the piston 11 is applied to the disc D within the cylinder hole 10. Sliding displacement toward.

  Accordingly, each friction pad 12 is pressed by the piston 11 or the inner leg portion 9 </ b> C of the caliper 9, and the ear portion 14 </ b> C slides inside the pad guide member 21, thereby being pressed against both surfaces of the disk D. At this time, the torque receiving portion 7 of the bracket 1 can stably receive the braking torque in the positive direction applied from the disk D to the friction pad 12 via the ear portion 14C of the back metal 14, thereby Sufficient braking force can be applied.

  Further, in a vehicle such as a two-wheeled vehicle, for example, a driver may operate a brake while pushing the vehicle and moving it backward. At this time, the torque receiving portion 8 of the bracket 1 can stably receive the reverse braking torque applied from the disk D to the friction pad 12 via the ear portion 14C, and the disk D is also rotated during the reverse rotation of the wheel. A braking force can be applied to the.

  Thus, according to the present embodiment, since the guide portion 20 is provided in the sub-pin mounting portion 4 of the bracket 1, the guide portion 20 is provided when the caliper 9 is rotated and assembled to the bracket 1. The collar 18 of the caliper 9 can be guided toward a position overlapping the sub-pin mounting portion 4 of the bracket 1.

  As a result, even if the collar 18 is displaced in the axial direction of the disk D with respect to the bracket 1, this displacement can be easily corrected by the guide portion 20, and the end face 18A of the collar 18 and the sub-pin mounting portion can be corrected. 4 can be aligned smoothly. As a result, it is possible to reliably prevent the sub-pin mounting portion 4 and the collar 18 from interfering with each other due to the displacement of the caliper 9 and the collar 18.

  Therefore, the work of assembling the brake, the work of replacing the friction pad, and the like can be performed smoothly, and these workability can be improved. Further, it is possible to avoid the outer surfaces of both the collar 18 and the sub-pin mounting portion 4 from being damaged, and the merchantability can be improved.

  In this case, since the guide portion 20 has, for example, a tapered surface 20A inclined in the axial direction of the disk D, when the caliper 9 is rotated, the axial position of the collar 18 is attached to the sub-pin along the tapered surface 20A. Therefore, the caliper 9 can be assembled efficiently.

  Further, since the inclination angle θ0 of the guide portion 20 is set to an angle smaller than the inclination angles θ1 and θ2 of the imaginary lines L1 and L2 along the contour of the expansion and contraction portion 19B of the protective boot 19, for example, it is displaced in the axial direction. When the collar 18 comes close to the guide portion 20, the end portion side of the collar 18 can be brought into contact with the guide portion 20 before the expansion / contraction portion 19 </ b> B of the protective boot 19 contacts the guide portion 20.

  A clearance θc having an angle corresponding to the difference between the inclination angle θ0 and the inclination angles θ1 and θ2 can always be ensured between the expansion / contraction part 19B of the protective boot 19 and the guide part 20. For this reason, when the collar 18 is in a state of being displaced, the protective boot 19 comes into contact with the guide portion 20 or the protective boot 19 is sandwiched between the guide portion 20 and the collar 18. It can be surely prevented.

  Therefore, when the caliper 9 is assembled, the work can be performed smoothly without damaging the protective boot 19, and the workability and brake reliability during assembly can be improved.

  In the above embodiment, the guide portion 20 is provided in the sub-pin mounting portion 4 of the bracket 1. However, the present invention is not limited to this, and for example, as shown in a modification shown in FIG. It is good also as a structure which provides a guide part in this. In this case, an annular guide portion 32 is provided on the end surface 31A side of the collar 31, and the guide portion 32 has a tapered surface 32A that is inclined in a substantially conical shape.

  Further, in the embodiment, the description has been given by taking a disc brake for a motorcycle as an example, but the present invention is not limited to this and can be applied to a disc brake mounted on a vehicle such as an automobile.

1 is a front view showing a disc brake according to an embodiment of the present invention. It is the top view which looked at the disk brake of FIG. 1 from the upper side. It is the longitudinal cross-sectional view which looked at the disc brake from the arrow III-III direction in FIG. It is a front view which shows the bracket of a disc brake alone. It is a principal part expanded sectional view which looked at the bracket, the caliper, the sub pin, the collar, etc. from the arrow VV direction in FIG. It is a front view which shows the state which rotates a caliper centering on a main pin in the state which removed the sub pin. It is a front view which shows the state which rotated the arm part of the caliper to the vicinity of the sub pin attachment part of a bracket. It is the left view which looked at the disc brake from the arrow VIII-VIII direction in FIG. FIG. 6 is an enlarged cross-sectional view of a main part similar to FIG. 5 showing a state in which the arm part of the caliper is rotated to a position where it overlaps with the sub-pin mounting part of the bracket. It is a principal part expanded sectional view which shows the state which the color | collar shifted greatly in the direction which leaves | separates from a bracket within the pin insertion hole of a caliper. It is a principal part expanded sectional view which shows the state which the color | collar shifted | deviated greatly toward the bracket within the pin insertion hole of a caliper. It is the principal part expanded sectional view which looked at the disc brake by the modification of this invention from the same position as FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bracket 3 Main pin attaching part 4 Sub pin attaching part 6 Pad guide groove 7, 8 Torque receiving part 9 Caliper 9A Outer leg part 9B Bridge part 9C Inner leg part 9D Arm part (main pin insertion part)
9E Arm (sub-pin insertion part)
9F Pin insertion hole 12 Friction pad 16 Main pin 17 Sub pin 18, 31 Collar (Sub pin insertion part)
18A End face 19 Protective boot 19A Tube part 19B, 19C Extendable part 20, 32 Guide part 20A, 32A Tapered surface S Reference line L1, L2 Virtual line θ0, θ1, θ2 Inclination angle θc Clearance

Claims (3)

A bracket having a main pin attachment portion and a sub pin attachment portion, a caliper having a main pin insertion portion and a sub pin insertion portion corresponding to the main pin attachment portion and the sub pin attachment portion of the bracket, and both sides of the disk by the caliper A pair of friction pads to be pressed; a main pin attached to the main pin attachment portion of the bracket via the main pin insertion portion of the caliper; and the main pin attached to the sub pin attachment portion via the sub pin insertion portion; A disc brake having a sub-pin that supports the caliper together so as to be movable in the axial direction of the disc.
Either one of the sub-pin mounting portion of the bracket and the sub-pin insertion portion of the caliper has the sub-pin insertion portion when the caliper is rotated around the main pin with the sub-pin removed. A disc brake characterized in that a guide portion is provided for guiding toward the sub-pin mounting portion.   The sub pin insertion portion of the caliper is a cylindrical collar that is inserted in a pin insertion hole provided in the caliper so as to be movable in the axial direction, and has an end surface that abuts on the sub pin mounting portion of the bracket. The guide portion is configured as a tapered surface that fits the axial position of the collar to the sub-pin attachment portion before the sub-pin is attached. Disc brake.   Provided on the outer peripheral side of the collar is a protective boot in which a portion near the sub-pin mounting portion of the bracket is a substantially conical expansion / contraction portion, and the inclination angle of the guide portion follows the contour of the expansion / contraction portion of the protection boot. The disc brake according to claim 2, wherein the disc brake is configured to be set at an angle smaller than an inclination angle of the imaginary line.

Images