JP6122750B2 - Disc brake - Google Patents

Description

  The present invention relates to a disc brake.

  Some types of calipers for disc brakes are integrally formed of a casting, and those formed by connecting these members separately from a cylinder member and a bridge member. Among these, in the latter, there is a disc brake caliper having two press-molded members fixed to each other and a cylinder fitted in a hole formed in these press-molded members (for example, see Patent Document 1). . Further, there is a caliper for a disc brake in which a caliper member is formed of a sheet metal and a cylinder portion made of a casting is cast into a hole formed at one end of the caliper member (see, for example, Patent Document 2).

JP 59-97328 A JP-A-56-105130

  In the disc brake, from the viewpoint of improving the braking efficiency, it is preferable to dispose the piston, that is, the cylinder that supports the piston, facing the radially outer portion of the braking surface of the disc. In this case, it is necessary to reduce the distance in the disk radial direction between the bridge portion and the cylinder across the disk. Therefore, when the bridge member having the bridge portion and the cylinder member are separated, the assembling work of the cylinder member to the bridge member becomes troublesome. Although it is possible to provide an opening through which the cylinder member can pass in the bridge portion and to assemble the cylinder member to the bridge member from this opening, the bridge portion may be enlarged to compensate for the insufficient strength of the opening.

  Therefore, an object of the present invention is to provide a disc brake capable of improving workability of assembling a cylinder member to a bridge member while suppressing an increase in size.

  In order to achieve the above object, according to the present invention, an insertion hole through which the cylinder member is inserted is formed in the fixed portion of the bridge member, and the insertion hole is a space portion on the outer side in the disk radial direction than the cylinder member. It was set as the structure which has.

  According to the disc brake of the present invention, it is possible to improve workability of assembling the cylinder member to the bridge member while suppressing an increase in size.

It is a front view showing a disc brake concerning one embodiment of the present invention. 1 is a plan view showing a disc brake according to an embodiment of the present invention. It is a side view showing a disc brake concerning one embodiment of the present invention. It is XX sectional drawing of FIG. It is a rear view which shows the disc brake which concerns on one Embodiment of this invention. It is the perspective view seen from the outer side which shows the disc brake which concerns on one Embodiment of this invention. It is the perspective view seen from the inner side which shows the disc brake which concerns on one Embodiment of this invention. It is a rear view which shows the carrier and inner side pad of the disc brake which concern on one Embodiment of this invention. It is a front sectional view showing a carrier and an outer side pad of a disc brake according to an embodiment of the present invention. It is a front view which shows the caliper main body of the disc brake which concerns on one Embodiment of this invention. It is a top view which shows the caliper main body of the disc brake which concerns on one Embodiment of this invention. It is a side view which shows the caliper main body of the disc brake which concerns on one Embodiment of this invention. It is a rear view which shows the caliper main body of the disc brake which concerns on one Embodiment of this invention. It is the perspective view seen from the outer side which shows the caliper main body of the disc brake which concerns on one Embodiment of this invention. It is the perspective view seen from the inner side which shows the caliper main body of the disc brake which concerns on one Embodiment of this invention. It is a characteristic diagram which shows the relationship between the axial direction length of the partition part between a seal groove and a bridge member, and the deformation amount of a seal groove.

  A disc brake according to an embodiment of the present invention will be described below with reference to the drawings.

  The disc brake 10 of the present embodiment is for a vehicle, specifically for a four-wheel vehicle, and brakes the vehicle by braking the disc 11 shown in FIGS. Is. Of course, the present invention can also be applied to other vehicles such as motorcycles. Hereinafter, the radial direction of the disk 11 is referred to as a disk radial direction, the axial direction of the disk 11 is referred to as a disk axial direction, and the rotational direction of the disk 11 is referred to as a disk rotational direction. A line passing through the disc rotation center of the disc brake 10 and the rotation center of the disc 11 along the disc radial direction is referred to as a brake center line.

  The disc brake 10 is slidable in the disc axial direction with respect to the carrier 12, the pair of friction pads 13 and 14 shown in FIG. 4 supported so as to be slidable in the disc axial direction with the carrier 12. And a caliper 15 to be supported.

  As shown in FIGS. 2 to 4 and 6, the carrier 12 is disposed so as to straddle the outer diameter side of the disk 11 and is fixed to the non-rotating portion of the vehicle. The pair of friction pads 13 and 14 shown in FIG. 4 are arranged so that one friction pad 13 faces the outer side surface of the disk 11 (the vehicle width direction outer side: the left side in FIG. 4), and the other friction pad 14. Is arranged so as to face the inner side surface of the disk 11 (inner side in the vehicle width direction: right side in FIG. 4). The pair of friction pads 13 and 14 are supported by the carrier 12 on both sides in the disk rotation direction. That is, the carrier 12 guides the pair of friction pads 13 and 14 in the disk axial direction.

  2 to 4 and 6, the caliper 15 is supported by the carrier 12 so as to be slidable in the disk axial direction while straddling the outer diameter side of the disk 11, and a pair of calipers 15 shown in FIG. The friction pads 13 and 14 are moved and pressed against the disk 11 to apply friction resistance to the disk 11 to brake the wheel.

  As shown in FIG. 1, the carrier 12 has a mirror-symmetric shape around a plane including the brake center line. The carrier 12 includes a carrier body 18 and a pair of guide members 19 and 19. As shown in FIGS. 3, 4, and 7, the carrier main body 18 is a plate-shaped mounting base that is disposed so as to face the inner side (right side in FIGS. 3 and 4) of the disk 11. 2, a plate-like outer beam portion 21 disposed so as to face the outer side (left side in FIG. 4) of the disk 11 as shown in FIGS. 2, 4 and 6, and FIG. As shown in FIG. 4, the mounting base portion 20 and the outer beam portion 21 are connected to each other at both ends in the disc rotation direction beyond the outer side of the disc 11 in the radial direction.

  The mounting base portion 20 shown in FIG. 8 is disposed in the same plane perpendicular to the disk axial direction, and includes a base body portion 25, a pair of outer extending portions 26, 26, and a pair of inner extending portions 27, 27.

  The base body portion 25 extends along the disk rotation direction. One outer extension 26 extends outward in the disk radial direction from one end in the disk rotation direction outside the disk radial direction of the base main body 25, and the other outer extension 26 is the disk of the base main body 25. It extends outward in the radial direction of the disk from the other end in the disk rotation direction on the outer side in the radial direction. The pair of outer extending portions 26, 26 extend so as to be inclined away from the brake center line toward the outer side in the disk radial direction. As shown in FIG. 7, one end of the outer extending portion 26 opposite to the base main body 25 is connected to one connecting portion 22, and what is the base main body 25 of the other outer extending portion 26? The opposite end is connected to the other connecting portion 22.

  As shown in FIG. 8, one inner extension portion 27 extends outward in the disk radial direction from an inner proximity position in the disk rotation direction than one outer extension portion 26 on the outer side in the disk radial direction of the base body portion 25. The other inner extending portion 27 extends outward in the disc radial direction from the inner proximity position in the disc rotating direction with respect to the other outer extending portion 26 on the outer side in the disc radial direction of the base body portion 25. The pair of inner extending portions 27, 27 extends in parallel with the brake center line.

  A pair of pad support recesses 28 and 28 are formed in the pair of inner extending portions 27 and 27. One pad support recess 28 is formed on the other inner extension 27 side of one inner extension 27 so as to be recessed in the direction away from the other inner extension 27 (outward in the disk rotation direction). The other pad support recess 28 is formed on the one inner extension 27 side of the other inner extension 27 so as to be recessed in the direction away from the one inner extension 27 (outward in the disk rotation direction). Yes. That is, the pair of pad support recesses 28 are recessed in opposite directions along the disk rotation direction. A pair of fitting holes 29 and 29 are formed in the pair of inner extending portions 27 and 27 as shown in FIG. One fitting hole 29 penetrates a portion of one inner extending portion 27 opposite to the base main body portion 25 in the disk axial direction, and the other fitting hole 29 is formed on the other inner extending portion 27. A portion opposite to the base main body 25 is penetrated in the disk axial direction.

  A pair of attachment holes 30 are formed in the base body portion 25. One mounting hole 30 is formed in a portion of the base body portion 25 on one side in the disk rotation direction so as to penetrate in the disk axial direction, and the other mounting hole 30 is on the other side of the base body portion 25 in the disk rotation direction. The portion is formed so as to penetrate in the disk axial direction. The carrier 12 is fixed to the non-rotating portion of the vehicle by a fastener inserted through the mounting holes 30 and 30.

  As shown in FIG. 7, one connecting portion 22 extends in the disk axial direction from the end portion of one outer extending portion 26 opposite to the base body portion 25, and the other connecting portion 22 The other outer extension 26 extends in the disc axial direction from the position of the end opposite to the base body 25. As shown in FIG. 1, one connecting portion 22 is along the tangential direction of the outer peripheral position of the disk 11 facing the inner side in the disk radial direction, and the other connecting portion 22 faces the inner side in the disk radial direction. Along the tangential direction of the outer peripheral position of the disk 11. As shown in FIG. 2, the pair of connecting portions 22, 22 extends beyond the outer peripheral surface of the disk 11 to the side opposite to the mounting base portion 20.

  As shown in FIG. 6, the outer beam portion 21 connects the inner end positions of the pair of connecting portions 22, 22 that extend to the opposite side of the mounting base portion 20 from the disc 11 in the disc rotation direction. In the same plane perpendicular to the brake center line. The outer beam portion 21 has a pair of substrate portions 31, 31, a single beam main body portion 32, and a pair of pad support portions 33, 33. One substrate portion 31 extends from the other connecting portion 22 side of the one connecting portion 22 (inward in the disk rotation direction) toward the other connecting portion 22, and the other substrate portion 31 is connected to the other connecting portion 22. The portion 22 extends from the one connecting portion 22 side (inward in the disk rotation direction) toward the one connecting portion 22.

  The beam main body portion 32 connects the side close to the pair of substrate portions 31 and 31 and the side opposite to the mounting base portion 20 in the disk axial direction. One pad support portion 33 protrudes from the other substrate portion 31 side of the one substrate portion 31 and the mounting base portion 20 side in the disc axial direction to the other substrate portion 31 side (in the disc rotation direction inner side). The pad support portion 33 protrudes from the one substrate portion 31 side of the other substrate portion 31 and the mounting base portion 20 side in the disc axial direction to the one substrate portion 31 side (in the disc rotation direction inside).

  The carrier body 18 is mainly formed by press molding from a single metal plate having a constant plate thickness. For example, the carrier body 18 is surrounded by the outer beam portion 21, the mounting base portion 20, and the connecting portions 22 and 22, and the space portion in which the disk 11 and the pair of friction pads 13 and 14 are disposed, An intermediate formed body in an unfolded state arranged in the same plane is prepared with the joint holes 29, 29 and the mounting holes 30, 30 pre-punched. The intermediate formed body is bent by a press device so that the pair of connecting portions 22 and 22 are bent with respect to the mounting base portion 20, and the outer beam portion 21 is bent with respect to the pair of connecting portions 22 and 22. In this way, the carrier body 18 is formed. The fitting holes 29 and 29 and the mounting holes 30 and 30 can be formed after the bending process.

  As shown in FIGS. 6 and 7, each of the pair of guide members 19, 19 has a bottomed cylindrical shape, and has a small-diameter outer diameter portion 36 on the bottom side and a side opposite to the bottom portion on the outer peripheral side. And a large-diameter outer diameter portion 37 having a larger diameter than the small-diameter outer diameter portion 36. As shown in FIG. 6, one guide member 19 has a small-diameter outer diameter portion 36 fitted into one fitting hole 29 of the carrier body 18 from the side opposite to the outer beam portion 21 in the disk axial direction. At that time, as shown in FIG. 3, the step surface between the large-diameter outer diameter portion 37 and the small-diameter outer diameter portion 36 contacts the inner extension portion 27. As shown in FIG. 7, the other guide member 19 has a small-diameter outer diameter portion 36 fitted into the other fitting hole 29 shown in FIG. 9 of the carrier body 18 from the side opposite to the outer beam portion 21 in the disk axial direction. In this case, the step surface between the large-diameter outer diameter portion 37 and the small-diameter outer diameter portion 36 contacts the inner extension portion 27. Thus, the pair of guide members 19, 19 are fitted and fixed to the carrier body 18 to form the carrier 12. The guide members 19, 19 are arranged along the disk axial direction.

  As shown in FIG. 4, the outer friction pad 13 includes a back plate 41 and a friction material 42 attached to one side in the thickness direction of the back plate 41. The back plate 41 includes a base plate portion 43 that supports the friction material 42 and a pair of convex portions 44 and 44 shown in FIG. 9. The pair of convex portions 44 and 44 includes a pair of fitting concave portions 45 and 44. 45 is formed. One convex portion 44 protrudes from the one end portion of the substrate portion 43 in the disk rotation direction in the direction away from the substrate portion 43 along the disk rotation direction (outward in the disk rotation direction). The portion 43 protrudes in the direction away from the substrate portion 43 (outward in the disc rotation direction) along the disc rotation direction from the other end portion in the disc rotation direction. One fitting recess 45 is formed in the intermediate portion of the one projecting portion 44 in the radial direction of the disk, and is recessed toward the other projecting portion 44 along the disc rotating direction (inward in the disc rotating direction). Yes. The other fitting recess 45 is formed at the intermediate portion in the disk radial direction of the other protrusion 44, and is recessed toward the other protrusion 44 along the disk rotation direction (inward in the disk rotation direction). Yes.

  In the friction pad 13, one fitting concave portion 45 formed in one convex portion 44 fits one pad support portion 33 so as to be slidable, and the other one formed in the other convex portion 44. The fitting recess 45 fits the other pad support portion 33 in a slidable manner. In this way, the outer friction pad 13 is supported so that the back plate 41 can move in the disk axial direction while the movement in the disk rotation direction and the disk radial direction is restricted with respect to the carrier 12. The friction pad 13 abuts the friction material 42 shown in FIG. The carrier 12 receives the braking torque generated by the friction pad 13 coming into contact with the disk 11 at the pad support portion 33 in front of the disk rotation direction that contacts the friction pad 13.

  As shown in FIG. 4, the inner friction pad 14 includes a back plate 51 and a friction material 52 attached to one side in the thickness direction of the back plate 51. The back plate 51 has a substrate portion 53 that supports the friction material 52 and a pair of convex portions 54 and 54 shown in FIG. One convex portion 54 protrudes from one end portion of the substrate portion 53 in the disk rotation direction in a direction away from the substrate portion 53 along the disk rotation direction (outward in the disk rotation direction), and the other convex portion 54 The part 43 protrudes from the other end of the disk rotation direction in the disk rotation direction in the direction away from the substrate part 43 (outward in the disk rotation direction). A wear sensor 55 shown in FIG. 3 that contacts the disk 11 when the friction material 52 shown in FIG. 4 is worn is attached to the back plate 51 of the friction pad 14.

  As shown in FIG. 8, the inner friction pad 14 has one convex portion 54 slidably fitted in one pad support concave portion 28 and the other convex portion 54 slid on the other pad support concave portion 28. It is movably fitted. As a result, the inner friction pad 14 is supported such that the back plate 51 is movable in the disk axial direction while the movement in the disk rotation direction and the disk radial direction is restricted with respect to the carrier 12. The friction pad 14 is brought into contact with the disk 11 when the friction pad 14 is braked. The carrier 12 receives the braking torque generated by the friction pad 14 coming into contact with the disk 11 at the inner extending portion 27 in the front of the disk rotation direction in contact with the friction pad 14.

  The caliper 15 includes a caliper body 60 shown in FIGS. 10 to 15, a pair of slide pins 61 and 61 and a pair of pin boots 62 and 62 shown in FIGS. 6 and 7, a piston 63 and a seal member 64 shown in FIG. A piston boot 65 and a bleeder plug 66 are provided. As shown in FIGS. 10 to 15, the caliper body 60 includes a cylinder member 71 and a bridge member 72 that is a separate member.

  The cylinder member 71 is an integrally molded product of casting. As shown in FIG. 4, the cylinder main body 75 has a bottomed cylindrical shape, and a position 180 degrees different from the circumferential direction of the axial intermediate position of the cylinder main body 75. 14 and FIG. 15 projecting radially outward, and a projecting portion 77 projecting radially outward from a position different from these by 90 degrees. . That is, the cylinder member 71 is formed in a bottomed cylindrical shape as a whole, and a pair of protruding portions 76 and 76 and a protruding portion 77 are formed on the outer periphery of the cylinder member 71 so as to protrude radially outward. Although only one of the pair of projecting portions 76 and 76 is shown in FIG. 14, a screw hole 78 that penetrates along the axial direction of the cylinder body 75 is formed in each of the pair of projecting portions 76 and 76. As shown in FIG. 10, a screw hole 79 is also formed in the protrusion 77.

  As shown in FIG. 4, the cylinder main body 75 has a cylindrical portion 84 and a bottom portion 85 that closes one end in the axial direction, and the opposite side of the cylindrical portion 84 from the bottom 85 is an opening 86. It has become. The cylinder member 71 has a central protrusion 88 protruding from the bottom 85 in the opposite direction to the opening 86 at the central position of the bottom 85, and a radially outer position than the central protrusion 88 of the bottom 85 as shown in FIG. And a pair of projecting portions 89 and 89 projecting in the same direction as the central projecting portion 88 from the bottom portion 85, and a connecting portion 90 projecting lower than these to connect them. A protrusion 77 shown in FIG. 10 is arranged on an extension of a line connecting the center position between the pair of protrusions 89 and 89 and the center protrusion 88.

  As shown in FIG. 4, a screw hole 93 is formed in the central protrusion 88 so as to pass through this and the bottom 85, and a screwing member of a brake pipe (not shown) is screwed into the screw hole 93. . As a result, the brake pipe communicates with the inside of the cylinder body 75. An engagement hole 94 is formed at a position between the pair of projecting portions 89 and 89 of the connecting portion 90, and an engagement member of a brake pipe (not shown) is engaged with the engagement hole 94. Thereby, the extension direction from the cylinder member 71 of brake piping is made constant. A screw hole 95 shown in FIGS. 13 and 15 is formed in a predetermined one on the upper side of the pair of protrusions 89 and 89 when attached to the vehicle. The air bleeder plug 66 shown in FIGS. 2 to 4, 6, and 7 is screwed into the screw hole 95.

  As shown in FIGS. 14 and 15, the cylinder body 75 is on the opposite side of the bottom 85 from the small diameter outer diameter portion 100 on the outer peripheral side, on the bottom 85 side and having a cylindrical outer peripheral surface. The outer peripheral surface has a large-diameter outer diameter portion 101 having a cylindrical surface shape larger in diameter than the small-diameter outer diameter portion 100. The pair of protrusions 76 and 76 and the protrusion 77 described above are formed at the end position of the large-diameter outer diameter portion 101 on the small-diameter outer diameter portion 100 side. End surfaces (contact surfaces) 76a, 76a on the small diameter outer diameter portion 100 side of the protrusions 76, 76 shown in FIG. 13 and end surfaces (contact surfaces) 77a on the small diameter outer diameter portion 100 side of the protrusion 77 shown in FIG. Are arranged in the same plane as the end surface 101a on the small diameter outer diameter portion 100 side of the large diameter outer diameter portion 101 shown in FIG. As described above, in the cylinder member 71, the outer diameter of the small-diameter outer diameter portion 100 that is closer to the bottom portion 85 than the protruding portions 76 and 76 and the protruding portion 77 is opposite to the bottom portion 85 from the protruding portions 76 and 76 and the protruding portion 77. The outer diameter of the large-diameter outer diameter portion 101 excluding the protruding portions 76 and 76 and the protruding portion 77 is smaller.

  As shown in FIG. 4, a piston 63 is disposed in the cylinder body 75. At that time, the piston 63 is slidably fitted to the cylindrical guide surface 84 a on the inner peripheral side of the cylindrical portion 84. An annular locking groove 105 that is recessed radially outward from the guide surface 84 a is formed at the opening end position on the opening 86 side of the inner peripheral portion of the cylindrical portion 84. An annular seal groove 106 that is recessed radially outward from the guide surface 84a is formed slightly on the bottom 85 side. The seal groove 106 is entirely disposed in the range of the large-diameter outer diameter portion 101 in the axial direction, and the projecting portions 76 and 76 and the end surfaces 76a, 76a and 77a of the projecting portion 77 show the end surface 77a in FIG. In this manner, the cylinder member 71 is disposed closer to the bottom 85 than the seal groove 106. As shown in FIG. 4, the seal groove 106 overlaps the end face on the opposite side of the protrusions 76, 76 and the bottom part 85 of the protrusion 77 with the axial position. Except for the screw hole 95 shown in FIG. 5, the cylinder member 71 has a mirror-symmetric shape around a plane including the center line of the protrusion 77 and the center line of the cylinder body 75 shown in FIG. 10.

  As shown in FIG. 4, the piston 63 has a cylindrical portion 110 and a bottom portion 111 that closes one end in the axial direction, and an opening 112 is provided on the opposite side of the cylindrical portion 110 from the bottom portion 111. Yes. The piston 63 is slidably fitted to the guide surface 84a of the cylinder body 75 with a cylindrical sliding surface 110a on the outer peripheral side of the cylindrical portion 110. At that time, the piston 63 is disposed in the cylinder main body 75 in such a direction that the bottom 111 is located on the bottom 85 side and the opening 112 is located on the opposite side of the bottom 85. On the opening 112 side of the outer periphery of the piston 63, an annular locking groove 113 is formed that is recessed radially inward from the sliding surface 110a. A seal member 64 is disposed in the seal groove 106 formed on the inner peripheral side of the cylinder member 71. The seal member 64 seals a gap between the inner peripheral side of the cylinder member 71 and the outer peripheral side of the piston 63. One end of the piston boot 65 is locked in the locking groove 105 formed on the inner peripheral side of the cylinder member 71, and the locking groove 113 formed on the outer peripheral side of the piston 63 is locked in the locking groove 113 formed on the outer peripheral side of the piston 63. The other end is locked. As a result, the piston boot 65 restricts foreign matter from entering the gap between the cylinder member 71 and the piston 63.

  As shown in FIG. 15, the bridge member 72 includes a plate-like fixing portion 120 to which the cylinder member 71 is fixed, and a plate-like bridge portion that extends in a direction perpendicular to the fixing portion 120 from one end edge of the fixing portion 120. 14 and a plate-like claw portion 122 extending in a direction perpendicular to the bridge portion 121 from the side opposite to the fixing portion 120 of the bridge portion 121 as shown in FIG. The fixing part 120 and the claw part 122 extend from the bridge part 121 to the same side in the thickness direction.

  As shown in FIGS. 13 and 15, the fixing portion 120 has a width in the direction opposite to the board portion 125 having a constant length in the width direction (left and right direction in FIG. 13) and the bridge portion 121 of the board portion 125. A bulging plate portion 126 having a shape that bulges so as to be located on the opposite side of the bridge portion 121 toward the center side in the direction. A pair of through-holes 127 and 127 penetrating in the thickness direction are formed at both end portions in the width direction of the substrate portion 125 at end positions on the side opposite to the bridge portion 121. Since the substrate portion 125 has a constant width, the edge portions 125A and 125A on both sides in the width direction are parallel to each other. The bulging plate portion 126 has an arc shape in which the edge portion 126A at the center in the width direction has a center on the substrate portion 125 side, and the edge portions 126B and 126B on both sides thereof are opposite to the respective substrate portions 125. It has an arc shape with a center on the side. A central through hole 128 shown in FIG. 4 through which the bolt 150 is inserted is formed in the center of the bulging plate portion 126 in the width direction so as to penetrate in the thickness direction. A pair of side through holes (not shown) through which the bolts 150 shown in FIGS. 13 and 15 are inserted are also formed on both sides in the width direction.

  As shown in FIG. 15, the bridge portion 121 extends from the fixed portion 120 so that the width direction of the fixed portion 120 is matched. As shown in FIGS. 12 and 15, the bridge portion 121 is a curved plate portion that extends in the vertical direction with respect to the fixed portion 120 while being bent from an end edge portion of the fixed portion 120 opposite to the bulging plate portion 126. 131 and a flat plate portion 132 that extends in a direction perpendicular to the fixing portion 120 in a flat shape from an edge portion on the opposite side to the fixing portion 120 of the curved plate portion 131. As shown in FIG. 12, the curved plate portion 131 has an arcuate shape having a center on the range side sandwiched between the curved plate portion 131 and the fixed portion 120 when viewed in the width direction of the fixed portion 120. The curved plate portion 131 is positioned so that the portion on the fixed portion 120 side is closer to the front side in the bulging direction of the bulging plate portion 126 on the fixed portion 120 side, and the portion on the opposite side to the fixed portion 120 is away from the fixed portion 120. The bulge plate portion 126 is curved so as to be positioned on the front side in the bulge direction.

  As shown in FIGS. 11 and 14, a pair of chamfers 133 and 133 are formed at both ends in the width direction at the end of the flat plate 132 opposite to the curved plate 131. In the bridge portion 121, a portion of the flat plate portion 132 excluding the pair of chamfers 133 and 133 and the curved plate portion 131 are constant width portions 134 having a constant width, and the constant width portion 134 shown in FIG. Is equal to the width of the substrate part 125 of the fixing part 120 shown in FIG. And the board | substrate part 125 and the constant width part 134 are making the position of the width direction correspond. As shown in FIG. 11, the edge portions 134A and 134A on both sides in the width direction of the constant width portion 134 are parallel to each other. As shown in FIG. 14, one edge portion 134A is the same as the one edge portion 125A. As shown in FIG. 15, the other end edge portion 134A is arranged in the same plane as the other end edge portion 125A.

  As shown in FIG. 14, the claw portion 122 extends from the bridge portion 121 so that the width direction thereof coincides with the fixing portion 120 and the bridge portion 121. As shown in FIG. 12, the claw portion 122 is curved from the edge of the bridge plate 121 opposite to the curved plate portion 131 of the flat plate portion 132 and extends in a direction perpendicular to the flat plate portion 132. The plate portion 140 includes a flat plate portion 141 that extends in a direction perpendicular to the flat plate portion 132 in a flat shape from the edge of the curved plate portion 140 opposite to the flat plate portion 132. The curved plate portion 140 has an arc shape having a center on the fixed portion 120 side when viewed in the width direction of the bridge portion 121. Therefore, the curved plate part 140 is positioned closer to the fixed part 120 as the bridge part 121 side is closer to the fixed part 120 side, and the part opposite to the bridge part 121 is closer to the fixed part 120 side. To be curved. The flat plate portion 141 is parallel to the fixed portion 120. As shown in FIG. 10, the claw portion 122 has a shape in which the length in the width direction decreases as the distance from the bridge portion 121 increases. The claw portion 122 has a non-recessed shape in which a tip end edge portion 122A opposite to the bridge portion 121 is in a straight line shape parallel to the bridge portion 121, and there is no recessed portion in the middle portion. That is, the claw portion 122 is formed to have a facing surface 122 a described later as a surface facing the opening portion 86 of the cylindrical portion 84 of the cylinder member 71 and the opening portion 112 of the piston 63.

  As shown in FIG. 15, the bridge member 72 has an insertion hole 145 that is continuous from the fixed portion 120 to the bridge portion 121 at the center in the width direction. The insertion hole 145 is divided into a region portion 146 disposed in the fixing portion 120 and a region portion 147 disposed in the bridge portion 121, and these are connected so as to be continuous.

  The insertion hole 145 includes an inner edge portion 145A and a pair of inner edge portions 145B and 145B arranged in the region portion 146 as shown in FIG. 13, and a pair of inner edge portions 145C and the inner edge portion 145C arranged in the region portion 147 as shown in FIG. 145C and an inner edge 145D. As shown in FIG. 13, the inner edge portion 145 </ b> A has a semicircular shape concentric with the end edge portion 126 </ b> A of the bulging plate portion 126. One inner edge portion 145B extends in parallel with the end edge portion 125A from one end of the inner edge portion 145A, and the other inner edge portion 145B extends in parallel with the end edge portion 125A from the other end of the inner edge portion 145A. To do. As shown in FIG. 15, one inner edge portion 145C extends in parallel with the end edge portion 134A from the side opposite to the inner edge portion 145A of one inner edge portion 145B, and the other inner edge portion 145C extends to the other inner edge portion 145C. The part 145B extends in parallel with the end edge part 134A from the side opposite to the inner edge part 145A. The inner edge portion 145D connects ends of the inner edge portions 145C and 145C opposite to the inner edge portions 145B and 145B. As shown in FIG. 14, the inner edge portion 145 </ b> D is parallel to the claw portion 122 and the fixing portion 120.

  As shown in FIG. 13, the inner edge portions 145B and 145B have a constant width, and as shown in FIG. 11, the inner edge portions 145C and 145C also have a constant width. The width between the inner edge portions 145B and 145B and the width between the inner edge portions 145C and 145C are wider than the outer diameter of the small diameter outer diameter portion 100 of the cylinder member 71 and smaller than the outer diameter of the large diameter outer diameter portion 101. . As shown in FIG. 15, the inner edges 145B and 145B and the inner edges 145C and 145C have the same width, and the positions in the width direction are matched. The widths of the inner edge portions 145B and 145B and the inner edge portions 145C and 145C are slightly longer than the outer diameter of the small diameter outer diameter portion 100 so that the small diameter outer diameter portion 100 of the cylinder member 71 can be inserted. The central through hole 128 shown in FIG. 4 formed at the center in the width direction of the bulging plate portion 126 and a pair of side through holes (not shown) on both sides thereof are the inner edge portion 145A of the insertion hole 145 shown in FIG. Are formed at equal intervals from the center of the substrate at intervals of 90 degrees. The bridge member 72 has a mirror-symmetric shape about a plane passing through the center in the width direction of the fixed portion 120, the bridge portion 121, and the claw portion 122.

  The bridge member 72 is mainly formed by press molding from a single metal plate having a constant plate thickness. For example, the fixing part 120 and the bridge part 121 in a state in which the central through hole 128 shown in FIG. 4 and a pair of side through holes (not shown) and the through holes 127 and 127 shown in FIG. 15 are formed in advance are shown in FIG. An intermediate formed body in an unfolded state in which the claw portions 122 are arranged in the same plane is prepared. The intermediate formed body is bent by the bending process so that the curved plate portion 131 is curved with respect to the fixed portion 120, and the flat plate portion 132 is slightly bent with respect to the curved plate portion 131 while being flat. The curved plate portion 140 is bent with respect to the flat plate portion 132, and the flat plate portion 141 is slightly bent with respect to the curved plate portion 140 while being flat. In this way, the bridge member 72 is formed. The central through hole 128 shown in FIG. 4 and a pair of side through holes (not shown) and the through holes 127 and 127 shown in FIG. 15 may be drilled after the bending process.

  The cylinder member 71 is inserted into and attached to the bridge member 72 through a region portion 146 disposed in the fixing portion 120 of the insertion hole 145. That is, the width between the inner edge portions 145B and 145B and the width between the inner edge portions 145C and 145C are wider than the outer diameter of the small diameter outer diameter portion 100 of the cylinder member 71 and smaller than the outer diameter of the large diameter outer diameter portion 101. Thus, the cylinder member 71 is inserted into the insertion hole 145 of the bridge member 72 from the claw portion 122 side with the bottom 85 side as the head, and the end surfaces 76a and 76a of the projections 76 and 76 and only one of them shown in FIG. The end surface 77 a of 77 is brought into contact with the inner surface 120 a on the claw portion 122 side of the fixing portion 120 of the bridge member 72. Here, when the cylinder member 71 is inserted into the insertion hole 145 from between the fixing portion 120 and the claw portion 122, the region portion 146 of the insertion hole 145 is opened upward, so that the cylinder member 71 is fixed to the fixing portion 120. It can be inserted in a state of being inclined so that the side is located closer to the bridge portion 121 side than the claw portion 122 side.

  In a state where the small diameter outer diameter portion 100 is arranged concentrically with the inner edge portion 145A of the insertion hole 145, the bolt 150 is inserted into the central through hole 128 of the bridge member 72 as shown in FIG. The other bolt 150 is inserted into one side through hole (not shown) of the bridge member 72, and the screw hole of one projecting portion 76 of the cylinder member 71 as shown in FIG. The other bolt 150 is inserted into the other side through hole (not shown) of the bridge member 72 and is screwed into the screw hole 78 of the other protrusion 76 of the cylinder member 71. In this way, the cylinder member 71 is coupled and fixed to the fixing portion 120 of the bridge member 72.

  In the fixed cylinder member 71 fixed to the bridge member 72, the end surfaces 76a and 76a of the projecting portions 76 and 76 and the end surface 77a of the projecting portion 77, which are only shown in FIG. The inner surface 120a abuts on the peripheral portion of the insertion hole 145 shown in FIG. In the fixed state, the insertion hole 145 extends from the cylinder member 71 to the bridge portion 121 side. In the fixed state, as shown in FIG. 4, the cylinder member 71 enters the region 147 of the insertion hole 145. In other words, the large-diameter outer diameter portion 101 of the cylinder member 71 enters the space portion 148 formed by the region portion 147 side of the small-diameter outer diameter portion 100 of the region portion 146 and the region portion 147.

  In the fixed state, the insertion hole 145 extends to the opposite side of the bottom 85 from the end of the cylinder member 71 on the opening 86 side in the axial direction of the cylinder member 71. In other words, in the axial direction of the cylinder member 71, the inner edge portion 145 </ b> D is disposed on the opposite side of the bottom portion 85 from the end portion of the cylinder member 71 on the opening portion 86 side. In the fixed state, the inner edge portion 145D overlaps the large diameter outer diameter portion 101 of the cylinder member 71 in the radial direction of the cylinder member 71, overlaps the small diameter outer diameter portion 100, and overlaps the cylinder main body portion 75. . In the fixed state, the claw portion 122 has a front end edge portion 122 </ b> A located on the opposite side of the bridge portion 121 from the center of the cylinder body portion 75 of the cylinder member 71. A facing surface 122a is formed to face the opening 86 and the opening 112 of the piston 63.

  In the manufacturing process for manufacturing the caliper 15, for example, the cylinder member 71 in a state where the seal member 64, the piston 63, the piston boot 65, and the bleeder plug 66 are assembled in advance is attached to the bridge member 72 with bolts 150, 150, 150. It will be assembled.

  Each of the pair of slide pins 61, 61 shown in FIGS. 6 and 7 has a mounting bolt 153 and a pin body 154. As shown in FIG. 6, one slide pin 61 is inserted from one side opposite to the claw portion 122 into one mounting hole 30 in which the mounting bolt 153 is formed in the fixing portion 120 of the bridge member 72 shown in FIG. 13. . As shown in FIG. 3, one slide pin 61 is attached to the fixing portion 120 by screwing a pin main body 154 disposed on the claw portion 122 side of the fixing portion 120 with the mounting bolt 153. The other slide pin 61 is inserted from the opposite side of the claw portion 122 into the other mounting hole 30 in which the mounting bolt 153 is formed in the fixing portion 120 of the bridge member 72. The other slide pin 61 is attached to the fixing portion 120 by screwing a pin main body 154 disposed on the claw portion 122 side of the fixing portion 120 to the mounting bolt 153. The slide pins 61, 61 are perpendicular to the substrate part 125 of the fixing part 120, and the extension length from the respective fixing part 120 to the claw part 122 side is constant width of the bridge part 121 from the fixing part 120. The extension length of the portion 134 is shorter.

  The caliper 15 is slidably inserted into one guide member 19 of the carrier 12 after one slide pin 61 shown in FIG. 6 is inserted into one pin boot 62 in the pin main body 154. FIG. The other slide pin 61 is inserted into the other guide member 19 of the carrier 12 after being inserted into the other pin boot 62 in the pin body 154. As a result, the caliper 15 is in a support state in which the carrier 12 is supported so as to be slidable along the disk axial direction. One pin boot 62 has one end locked to the proximal end side of one pin main body 154 and the other end locked to one guide member 19. One end of the other pin boot 62 is locked to the proximal end side of the other pin main body 154, and the other end side is locked to the other guide member 19.

  As shown in FIG. 4, in the above support state, the caliper 15 has the piston 63 disposed on the cylinder member 71 disposed on the side opposite to the disk 11 of one friction pad 14. It becomes possible to contact. Further, in the above support state, the bridge portion 121 of the bridge member 72 extends from the cylinder member 71 across the disk 11, and the claw portion 122 is disposed on the opposite side of the disk 11 of the other friction pad 13. . That is, in the bridge member 72, the bridge portion 121 extends from the fixed portion 120 in the disk axial direction and straddles the outer periphery of the disk 11, and the claw portion 122 extends from the bridge portion 121 inward in the disk radial direction to cause friction. The pad 13 is disposed on the side opposite to the disk 11. In the above support state, the guide surface 84a of the cylinder member 71 is in a state along the disk axis direction, and the piston 63 moves in the disk axis direction in a state along the disk axis direction.

  In the above support state, the insertion hole 145 formed in the bridge member 72 has the above-described space portion 148 on the outer side in the disk radial direction than the small diameter outer diameter portion 100 of the cylinder member 71. The cylinder member 71 has the large-diameter outer diameter portion 101 entering the space portion 148, and thus the position of the cylinder member 71 overlaps with the bridge portion 121 in the disk radial direction. Further, in the above support state, the bridge portion 121 is formed to bend inward in the disk radial direction as the curved plate portion 131 moves toward the claw portion 122.

  As shown in FIG. 6, in the above support state, the claw portion 122 is disposed between the beam main body portion 32 and the friction pad 13 with the beam main body portion 32 and the positions in the disk radial direction and the disk rotation direction being overlapped. . Further, in the above support state, the caliper 15 is in a state where the bridge portion 121 is along the disk rotation direction, and the flat plate portion 141 of the fixing portion 120 and the claw portion 122 is orthogonal to the disk axial direction. Further, in the above support state, the flat plate portion 132 of the bridge portion 121 is orthogonal to the brake center line.

  As shown in FIG. 7, in the above support state, the length in the disk rotation direction of the substrate part 125 that is the outer part in the disk radial direction of the fixed part 120 is the disk rotation of the constant width part 134 on the fixed part 120 side of the bridge part 121 It is equivalent to the direction length. In addition, in the above support state, the slide pins 61 and 61 shown in FIGS. 6 and 7 are arranged on the inner side of the bridge portion 121 in the disk radial direction at the portion closer to the claw portion 122 than the fixing portion 120. In the slide pins 61 and 61, at least a portion between the fixed portion 120 and the guide members 19 and 19 of the carrier 12 overlaps the bridge portion 121 with the positions in the disk axial direction and the disk rotation direction.

  As shown in FIG. 2, the insertion hole 145 is formed in a size that exposes the cylinder member 71, the friction pad 14, the disk 11, and the friction pad 13 outward in the disk radial direction in the above-described supporting state. The cylinder member 71, the friction pad 14, the disk 11, and the friction pad 13 are formed in a size and a position overlapping with each other in the disk axial direction and the disk rotation direction.

  In the disc brake 10 described above, when brake fluid is introduced between the cylinder body 75 of the caliper 15 and the piston 63 via a brake pipe (not shown) screwed into the screw hole 93 shown in FIG. 63 moves to the disk 11 side along the disk axis direction and abuts against the friction pad 14 and presses it against the disk 11 side to contact the disk 11. When the friction pad 14 is pressed against the disk 11, the caliper 15 moves the claw portion 122 of the bridge member 72 toward the disk 11 while sliding the slide pins 61, 61 with respect to the guide members 19, 19 by the reaction force. Let Then, the claw portion 122 comes into contact with the friction pad 13 and presses it toward the disk 11 to bring it into contact with the disk 11. In this manner, the friction pads 13 and 14 on both sides are pressed against the disk 11 to generate a frictional resistance, thereby braking the wheel that rotates integrally with the disk 11.

  According to the disc brake 10 according to the present embodiment described above, when the caliper 15 is formed by connecting the cylinder member 71 and the bridge member 72 separate from the cylinder member 71, the fixing portion 120 of the bridge member 72 is used. The insertion hole 145 that is formed in the through-hole for inserting the cylinder member 71 has a space portion 148 on the outer side in the disk radial direction than the cylinder member 71. Therefore, when the cylinder member 71 is inserted into the insertion hole 145 from between the fixed portion 120 and the claw portion 122, the fixed portion 120 side is inclined so that it is located closer to the bridge portion 121 side than the claw portion 122 side. Can be inserted. Therefore, the cylinder member 71 can be easily attached to the fixing portion 120 even if the fixing position of the cylinder member 71 to the fixing portion 120 is brought closer to the bridge portion 121 side in order to suppress the enlargement of the bridge member 72. That is, the workability of assembling the cylinder member 71 to the bridge member 72 can be improved while suppressing an increase in the size of the disc brake 10. And since the space part 148 becomes a ventilation opening, the cooling performance of the caliper 15 can be improved.

  Further, since the insertion hole 145 extends to the bridge portion 121, when the cylinder member 71 is inserted into the insertion hole 145, it can be inserted at a larger angle. Therefore, the cylinder member 71 can be more easily attached to the fixed portion 120.

  Further, since the insertion hole 145 is formed to have a size that exposes the cylinder member 71 outward in the disk radial direction, the end position of the cylinder member 71 on the bridge part 121 side in the disk radial direction is further set to the bridge part 121. Can be placed on the side. Therefore, the degree of freedom of design increases, such as arranging the cylinder member 71 closer to the bridge portion 121 and increasing the diameter of the cylinder member 71 (that is, increasing the diameter of the piston 63).

  Moreover, since the insertion hole 145 is formed in a size that exposes the friction pad 13 on the claw portion 122 side, the disk 11, and the friction pad 14 on the cylinder member 71 side, these states are visually confirmed through the insertion hole 145. can do. Therefore, it is not necessary to separately form through holes for visually confirming the state of the friction pads 13 and 14 and the disk 11, and the manufacturing cost can be reduced.

  Further, since the bridge portion 121 is formed to be curved inward in the disc radial direction as it goes toward the claw portion 122, the fixed portion 120 side can be disposed more outward in the disc radial direction. Therefore, the radial dimension of the cylinder member 71 can be increased while avoiding interference with the bridge portion 121.

  In addition, the length in the disk rotation direction of the substrate portion 125 that is the outer portion in the disk radial direction of the fixed portion 120 is equal to the length in the disk rotation direction of the curved plate portion 131 on the fixed portion 120 side of the bridge portion 121. For this reason, the rigidity of the bridge member 72 can be increased.

  Further, slide pins 61, 61 inserted into the carrier 12 are attached to the fixed portion 120, and the slide pins 61, 61 are disposed on the inner side of the bridge portion 121 in the disk radial direction. For this reason, the pin boots 62 and 62 and the slide pins 61 and 61 can be protected by the bridge portion 121 from gravel or the like scattered when the mounted vehicle travels.

  Further, the claw portion 122 has a so-called non-recessed shape in which the facing surface 122a on the fixed portion 120 side faces the opening 86 of the cylinder member 71, so that the rigidity of the claw portion 122 can be increased.

  Moreover, since the bridge member 72 is formed of a metal plate having a constant plate thickness, it can be formed mainly by press molding, and the manufacturing cost can be reduced.

  According to the disc brake 10 according to the present embodiment described above, when the caliper 15 is formed by connecting the cylinder member 71 and the bridge member 72 separate from the cylinder member 71, the inner peripheral side of the cylinder member 71. The end surfaces 76a and 76a of the projecting portions 76 and 76 of the cylinder member 71 and the end surface 77a of the projecting portion 77 are in contact with the peripheral portion of the insertion hole 145 on the claw portion 122 side of the fixing portion 120 rather than the seal groove 106 of the cylinder portion. 71 is disposed on the bottom 85 side. For this reason, the base portion of the bridge member 72 can be disposed closer to the bottom 85 side of the cylinder member 71 than the seal groove 106. Therefore, the length L in the disk axial direction of the partition wall portion between the seal groove 106 and the bridge member 72 in the cylinder member 71 can be secured. Further, since the seal groove 106 is aligned with the large-diameter outer diameter portion 101 at the position in the disk axial direction, the thickness of the outer portion in the radial direction than the seal groove 106 can be secured. Therefore, deformation of the seal groove 106 of the cylinder member 71 can be suppressed. Therefore, the deformation of the seal member 64 can be suppressed, and the possibility that the seal member 64 will pull back the piston 63 with elastic force when the brake hydraulic pressure is released can be reduced.

  16 shows the length L in the disk axial direction of the partition wall portion between the seal groove 106 and the bridge member 72 (specifically, the end portion on the bottom 85 side of the seal groove 106 and the end surfaces 76a and 76a and the end surface 77a of the bridge member 72). And the deformation amount of the seal groove 106 is shown. Thus, the deformation amount of the seal groove 106 decreases as the length L of the partition wall portion increases. In addition, when the length L of the partition wall portion is less than 10 mm, the reduction rate of the deformation amount is large, and when the length L is 10 mm or more, the reduction rate is low. Therefore, if the length L of the partition wall portion is 10 mm, deformation of the seal groove 106 can be suppressed while suppressing an increase in the size and weight of the caliper 15.

  In the cylinder member 71, the outer diameter of the small-diameter outer diameter portion 100 closer to the bottom 85 than the protrusions 76 and 76 and the protrusion 77 is a portion on the side opposite to the bottom 85 from the protrusions 76 and 76 and the protrusion 77. The outer diameter of the large-diameter outer diameter portion 101 excluding the protruding portions 76 and 76 and the protruding portion 77 is smaller. For this reason, the small diameter outer diameter part 100 can be thinned, and cost reduction and weight reduction can be achieved.

  In the above embodiment, a carrier that is attached to a non-rotating portion of the vehicle and guides the pair of friction pads in the axial direction of the disk, and a caliper that is slidably provided on the carrier and moves the pair of friction pads. The caliper is formed in a bottomed cylindrical shape, and a cylinder member in which a piston that presses one friction pad of the pair of friction pads is disposed is separated from the cylinder member. A bridge member formed on the body and extending across the disk from the cylinder member and pressing the other friction pad of the pair of friction pads, and the bridge member includes the cylinder A fixed portion to which the member is fixed, a bridge portion extending from the fixed portion in the disk axial direction and straddling the outer periphery of the disk, and extending from the bridge portion in the disk radial direction. And a claw portion that is in contact with the other friction pad, wherein the fixing portion has an insertion hole through which the cylinder member is inserted, and the insertion hole is The structure has a space portion on the outer side in the disk radial direction than the cylinder member. When the caliper is formed by joining the cylinder member and a separate bridge member, the insertion hole formed in the fixing portion of the bridge member for inserting the cylinder member is more disc than the cylinder member. A space portion is provided on the radially outer side. For this reason, when the cylinder member is inserted through the insertion hole from between the fixing portion and the claw portion, the cylinder member can be inserted in an inclined state so that the fixing portion side is positioned on the bridge portion side with respect to the claw portion side. Therefore, the cylinder member can be easily attached to the fixing portion even if the fixing position of the cylinder member to the fixing portion is brought closer to the bridge portion side in order to suppress the enlargement of the bridge member. That is, the workability of assembling the cylinder member to the bridge member can be improved while suppressing an increase in the size of the disc brake.

  Since the insertion hole extends to the bridge portion, when the cylinder member is inserted into the insertion hole, the insertion hole can be inclined and inserted at a larger angle. Therefore, the cylinder member can be more easily attached to the fixed portion.

  Since the insertion hole is formed in such a size that the cylinder member is exposed to the outside in the disk radial direction, the end position of the cylinder member on the bridge part side in the disk radial direction is arranged closer to the bridge part side. Can do. Therefore, the degree of freedom in design increases, such as arranging the cylinder member closer to the bridge portion or increasing the diameter of the cylinder member.

  Since the insertion hole is formed in a size that exposes the other friction pad, the state of one friction pad, the disk, and the other friction pad can be visually confirmed through the insertion hole. Therefore, it is not necessary to separately form through holes for visually confirming these states, and the manufacturing cost can be reduced.

  Since the bridge portion is formed to bend inward in the disk radial direction toward the claw portion, the fixed portion side of the bridge portion can be disposed on the outer side in the disk radial direction. Therefore, the diameter of the cylinder member can be increased while avoiding interference with the bridge portion.

  Since the length in the disk rotation direction of the outer portion in the disk radial direction of the fixed portion is equal to the length in the disk rotation direction on the fixed portion side of the bridge portion, the rigidity of the bridge member can be increased.

  A slide pin that is inserted through the carrier is attached to the fixed portion, and the slide pin is disposed inward in the disk radial direction of the bridge portion, so that the slide pin can be protected by the bridge portion. .

  Since the claw portion has a facing surface that faces the opening of the cylinder member, the claw portion can be increased in rigidity.

  Since the bridge member is formed of a metal plate having a constant plate thickness, the manufacturing cost can be reduced.

  In the above embodiment, the carrier is attached to a non-rotating portion of the vehicle and guides the pair of friction pads in the axial direction of the disk, and is slidably provided on the carrier, and moves the pair of friction pads. A caliper to be formed, and the caliper is formed in a bottomed cylindrical shape, and a cylinder member in which a piston that presses one friction pad of the pair of friction pads is disposed, and the cylinder member And a bridge member that extends across the disk from the cylinder member and presses the other friction pad of the pair of friction pads, and is coupled to the bridge member. A fixing portion having an insertion hole through which the cylinder member is inserted, and the cylinder member being fixed; and extending from the fixing portion in the disk axial direction and straddling the outer periphery of the disk A disk brake formed with a ridge portion and a claw portion that extends from the bridge portion in the disk radial direction and abuts against the other friction pad, and the cylinder member has an inner peripheral side, A seal groove in which a seal member for sealing a gap with the piston is disposed is formed, and an outer periphery of the cylinder member is in contact with a peripheral portion of the insertion hole on the claw portion side of the fixed portion. A projecting portion having a surface is formed so as to project outward in the radial direction, and the contact surface is disposed closer to the bottom of the cylinder member than the seal groove. Then, when the caliper is formed by joining the cylinder member and a separate bridge member, the insertion hole on the claw portion side of the fixing portion of the cylinder member rather than the seal groove on the inner peripheral side of the cylinder member An end surface that contacts the peripheral portion of the cylinder member is disposed on the bottom side of the cylinder member. For this reason, the base part of a bridge member can be arrange | positioned rather than the seal groove on the bottom part side of a cylinder member. Therefore, deformation of the seal groove of the cylinder member can be suppressed.

  The cylinder member has an outer diameter closer to the bottom than the protrusion, and is smaller than an outer diameter excluding the protrusion opposite to the bottom from the protrusion. The thickness can be reduced, and the cost and weight can be reduced.

10 Disc brake 11 Disc 12 Carrier 13 Friction pad (other friction pads)
14 Friction pad (One friction pad)
15 Caliper 61 Slide pin 63 Piston 71 Cylinder member 72 Bridge member 120 Fixed part 121 Bridge part 122 Claw part 122a Opposing surface 145 Insertion hole 148 Space part

Claims (9)

A carrier attached to a non-rotating part of the vehicle and guiding a pair of friction pads in the axial direction of the disc;
A caliper that is slidably provided on the carrier and moves the pair of friction pads;
With
The caliper is
A cylinder member that is formed in a bottomed cylindrical shape and in which a piston that presses one friction pad of the pair of friction pads is disposed, and is formed separately from the cylinder member. A bridge member that extends across the disk and presses the other friction pad of the pair of friction pads is combined,
The bridge member includes
A fixing portion to which the cylinder member is fixed; a bridge portion extending from the fixing portion in the disk axial direction and straddling the outer periphery of the disk; and extending from the bridge portion in the disk radial direction to contact the other friction pad. A disc brake formed with a claw portion in contact with the claw portion,
The fixing portion has an insertion hole through which the cylinder member is inserted,
The disc brake characterized in that the insertion hole has a space portion on the outer side in the disc radial direction than the cylinder member.   The disc brake according to claim 1, wherein the insertion hole extends to the bridge portion.   3. The disc brake according to claim 1, wherein the insertion hole is formed in a size that exposes the cylinder member outward in the disc radial direction.   4. The disc brake according to claim 1, wherein the insertion hole is formed in a size that exposes the other friction pad. 5.   5. The disc brake according to claim 1, wherein the bridge portion is formed to be curved inward in the disc radial direction toward the claw portion. 6.   6. The disk rotation direction length of a disk radial direction outer portion of the fixed portion is equal to a disk rotation direction length of the bridge portion on the fixed portion side. Disc brake according to item.   The slide pin inserted into the carrier is attached to the fixing portion, and the slide pin is disposed inward in the disk radial direction of the bridge portion. Disc brake according to one item.   The disc brake according to any one of claims 1 to 7, wherein a face facing the opening of the cylinder member is formed on the claw portion.   The disc brake according to any one of claims 1 to 8, wherein the bridge member is formed of a metal plate having a constant plate thickness.

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