JPWO2018139305A1 - Disc brake - Google Patents

Abstract

The caliper body is arranged on one side in the axial direction of the disk, and a cylinder part in which a bore for accommodating the piston is formed, and one end side is continuous with the bottom of the bore of the cylinder part, and extends in a direction away from the disk. The extension portion provided with the guide guide portion and the guide attachment portion to which the cable guide member is fixed are integrally formed. The guide mounting portion is formed on the other end side in the direction away from the disk of the extending portion so as to protrude from the extending portion in the rotating direction of the disk. The other end side of the extending portion, together with the guide mounting portion, has a substantially rectangular shape in a cross section parallel to the pressed surface of the disk.

Description

The present invention relates to a disc brake for vehicle braking.
This application claims priority on January 26, 2017 based on Japanese Patent Application No. 2017-011978 for which it applied to Japan, and uses the content for it here.

  In a disc brake, when a caliper body is cast, a gate is provided at a portion where a parking brake mechanism mounting portion of a mold is formed.

Japanese Patent No. 4262416

  When casting the caliper body, it is preferable to suppress the influence of defects such as sink marks.

  An object of the present invention is to provide a disc brake capable of suppressing the influence of defects such as sink marks.

  One aspect of the present invention includes a caliper body provided with a piston that presses at least a pair of friction pads against a disk, a parking brake mechanism provided in the caliper body to propel the piston, and a wire connected to the parking brake mechanism. And a cable guide member that is attached to the outside of the caliper body and locks the cable that encloses the wire. The caliper body is disposed on one side in the axial direction of the disk, and a cylinder part in which a bore for accommodating the piston is formed, and a first end side is continuous with a bore bottom of the cylinder part, An extending portion that extends in a direction away from the lever and is provided with the lever member and a guide attachment portion to which the cable guide member is fixed are integrally formed. The guide attachment portion is formed to protrude from the extension portion in the rotation direction of the disc on the second end side in the direction away from the disc of the extension portion. The second end side of the extension portion, together with the guide attachment portion, has a substantially rectangular shape in a cross section parallel to the pressed surface of the disk.

  Another aspect of the present invention includes a caliper body provided with a piston that presses at least a pair of friction pads against a disk, a parking brake mechanism provided in the caliper body to propel the piston, and a wire to the parking brake mechanism. And a cable guide member that is attached to the outside of the caliper body and locks the cable that encloses the wire. The caliper body is disposed on one side in the axial direction of the disc, and has a cylinder portion in which a bore for accommodating the piston is formed, and extends from the cylinder portion in the disc axial direction so as to straddle the outer peripheral side of the disc. A bridge portion to be formed; a claw portion extending from the bridge portion in the radial direction of the disc to be opposed to the pressed surface of the disc; and one end side continuous with the bore bottom of the cylinder portion; Extending in a direction to leave, and an extending portion including a hole portion in which the parking brake mechanism is provided. In the cross section parallel to the pressed surface of the disk, the cross sectional area where the cross sectional area including the cross sectional area of the hole portion from the cylinder portion to the extending portion is minimum is the minimum of the bridge portion. Is equal to or greater than the cross-sectional area.

  According to the disc brake described above, it is possible to suppress the influence of defects such as sink marks.

The top view which shows the disc brake of 1st Embodiment. The side view which shows the disc brake of 1st Embodiment. The side view which shows the disc brake of 1st Embodiment. The front view which shows the disc brake of 1st Embodiment. The rear view which shows the disc brake of 1st Embodiment. Sectional drawing which shows the disc brake of 1st Embodiment. The top view which shows the caliper body of the disc brake of 1st Embodiment. The side view which shows the caliper body of the disc brake of 1st Embodiment. The side view which shows the caliper body of the disc brake of 1st Embodiment. The front view which shows the caliper body of the disc brake of 1st Embodiment. The rear view which shows the caliper body of the disc brake of 1st Embodiment. The top view which shows the raw material state of the caliper body of the disc brake of 1st Embodiment. The side view which shows the raw material state of the caliper body of the disc brake of 1st Embodiment. The side view which shows the raw material state of the caliper body of the disc brake of 1st Embodiment. The front view which shows the raw material state of the caliper body of the disc brake of 1st Embodiment. The rear view which shows the raw material state of the caliper body of the disc brake of 1st Embodiment. The top view which shows the disc brake of 2nd Embodiment. The side view which shows the disc brake of 2nd Embodiment. The side view which shows the disc brake of 2nd Embodiment. The front view which shows the disc brake of 2nd Embodiment. The rear view which shows the disc brake of 2nd Embodiment. The bottom view which shows the disc brake of 2nd Embodiment. Sectional drawing which shows the disc brake of 2nd Embodiment. The top view which shows the caliper body of the disc brake of 2nd Embodiment. The side view which shows the caliper body of the disc brake of 2nd Embodiment. The side view which shows the caliper body of the disc brake of 2nd Embodiment. The front view which shows the caliper body of the disc brake of 2nd Embodiment. The rear view which shows the caliper body of the disc brake of 2nd Embodiment. The bottom view which shows the caliper body of the disc brake of 2nd Embodiment. The top view which shows the raw material state of the caliper body of the disc brake of 2nd Embodiment. The side view which shows the raw material state of the caliper body of the disc brake of 2nd Embodiment. The side view which shows the raw material state of the caliper body of the disc brake of 2nd Embodiment. The front view which shows the raw material state of the caliper body of the disc brake of 2nd Embodiment. The rear view which shows the raw material state of the caliper body of the disc brake of 2nd Embodiment. The bottom view which shows the raw material state of the caliper body of the disc brake of 2nd Embodiment.

[First Embodiment]
A first embodiment according to the present invention will be described below with reference to FIGS.

  The disc brake 10 according to the first embodiment shown in FIGS. 1 to 6 applies a braking force to a vehicle. As shown in FIG. 1, the disc brake 10 includes a carrier 11, a pair of friction pads 12, a caliper 13, a parking brake wire 15, and a parking brake cable 16. In the first embodiment, a pair of friction pads 12 are provided, but two or more pairs may be provided.

  The carrier 11 is disposed so as to straddle the outer diameter side of the disk-shaped disc 20 and is fixed to a non-rotating portion of a vehicle (not shown). The disk 20 rotates with a wheel (not shown) to be braked. The pair of friction pads 12 are disposed opposite to both surfaces of the disk 20. In this state, the pair of friction pads 12 are supported by the carrier 11 so as to be slidable in the axial direction of the disk 20. The caliper 13 is in a state straddling the outer diameter side of the disk 20. In this state, the caliper 13 is supported by the carrier 11 so as to be slidable in the axial direction of the disk 20. The caliper 13 presses the pair of friction pads 12 in contact with the pressed surfaces 20a on both sides in the axial direction of the disk 20. As a result, the caliper 13 imparts frictional resistance to the disk 20. In the following, the radial direction of the disk 20 is referred to as a disk radial direction. In the following, the axial direction of the disk 20 is referred to as a disk axial direction. In the following, the rotation direction of the disk 20 is referred to as a disk rotation direction. The disk rotation direction is the circumferential direction of the disk 20.

  The carrier 11 has an inner side pad support portion 24 shown in FIGS. 1 to 5, an outer side pad support portion 25 shown in FIGS. 1 to 4, and a pair of connecting portions 26 shown in FIGS. 1 to 3. ing. The inner side indicates the inner side in the vehicle width direction, and the outer side indicates the outer side in the vehicle width direction. The inner side pad support portion 24 supports both sides of the inner friction pad 12 in the disk rotation direction through a pair of pad guides 23 shown in FIG. As shown in FIG. 4, the outer side pad support part 25 supports the outer side friction pad 12 through a pair of pad guides 23 so as to be slidable. As shown in FIG. 1, the pair of connecting portions 26 are spaced apart in the disk rotation direction and extend in the disk axial direction. The pair of connecting portions 26 connects the inner side pad support portion 24 and the outer side pad support portion 25. The pair of connecting portions 26 are disposed across the outer diameter side of the disk 20.

  The pair of connecting portions 26 are on the outer side in the disk radial direction at both ends of the carrier 11 in the disk rotation direction. In the carrier 11, a pair of guide holes 29 are formed in the pair of connecting portions 26 along the disk axial direction from the inner side. In the pair of guide holes 29, a pair of sliding pins 30 of the caliper 13 are inserted and slidable from the inner side. The pair of sliding pins 30 inserted into the pair of guide holes 29 can slide in the disk axial direction. In this way, the pair of sliding pins 30 are inserted into the pair of guide holes 29. Thereby, the caliper 13 having the pair of sliding pins 30 is slidably supported by the carrier 11 having the pair of guide holes 29. A portion between the caliper 13 and the carrier 11 of the pair of sliding pins 30 is covered with a pair of boots 31. The pair of boots 31 can be expanded and contracted.

  The caliper 13 has a caliper body 34. The caliper body 34 is supported by the carrier 11 via a pair of sliding pins 30. In this state, the caliper body 34 straddles the disk 20. The caliper body 34 includes a cylinder portion 35, a bridge portion 36, a claw portion 37, a pair of arm portions 38, an extension portion 201, a guide attachment portion 39, a hose attachment portion 202, and a bleeder attachment portion 203. And have. In the caliper body 34, the cylinder portion 35, the bridge portion 36, the claw portion 37, the pair of arm portions 38, the extension portion 201, the guide attachment portion 39, the hose attachment portion 202, and the bleeder attachment portion 203 are integrally formed by casting. ing. Specifically, the caliper body 34 is formed of an aluminum alloy.

  The caliper body 34 has a cylinder portion 35 disposed on the inner side which is one side in the axial direction of the disk 20. The caliper body 34 has a claw portion 37 disposed on the outer side which is the other side in the axial direction of the disk 20. The caliper body 34 is provided with a bridge portion 36 that connects the claw portion 37 and the cylinder portion 35 across the disk 20.

  As shown in FIG. 6, the bridge portion 36 extends in the disc axial direction from the outside of the cylinder portion 35 in the disc radial direction. The bridge portion 36 is formed so as to straddle the outer peripheral side of the disk 20. In the bridge portion 36, a window hole 301 penetrating in the disc radial direction is formed in an intermediate portion in the disc rotation direction. The window hole 301 is an opening for an operator to visually check the wear state of the pair of friction pads 12 and the disk 20. The claw portion 37 extends inward in the disc radial direction from the opposite side of the bridge portion 36 to the cylinder portion 35 in the disc axial direction. The claw portion 37 is provided with a facing surface 302 facing the cylinder portion 35 on the cylinder portion 35 side in the disk axial direction. The facing surface 302 also faces the pressed surface 20a on one side in the axial direction of the disk 20.

  The caliper 13 is a so-called fist type caliper. As shown in FIG. 1, the pair of sliding pins 30 described above are fixed to the pair of arm portions 38. The pair of sliding pins 30 fixed to the pair of arm portions 38 are along the disk axial direction. The pair of sliding pins 30 fixed to the pair of arm portions 38 protrude from the pair of arm portions 38 to the claw portion 37 side. The pair of sliding pins 30 are fixed to the pair of arm portions 38 by a pair of bolts 41. The pair of bolts 41 are screwed onto the pair of sliding pins 30 from the inner side.

  As shown in FIG. 6, the cylinder portion 35 of the caliper body 34 has a cylinder tube portion 50 and a cylinder bottom portion 51. The cylinder cylinder part 50 is cylindrical, and the cylinder bottom part 51 is provided so as to close one end of the cylinder cylinder part 50 in the axial direction. The cylinder part 35 has a bottomed cylindrical shape. The cylinder portion 35 of the caliper body 34 has a cylinder opening 52. The cylinder part 35 has the cylinder opening 52 opposed to the friction pad 12 on the inner side. Here, the inner peripheral surface and the bottom surface of the cylinder tube portion 50 are referred to as a bore 55. The bore 55 is formed in the cylinder portion 35. The cylinder bottom portion 51 is a bore bottom in the cylinder portion 35. As shown in FIG. 1, a pair of sliding pins 30 attached to the caliper body 34 are slidably inserted into a pair of guide holes 29 of the carrier 11. Then, as shown in FIG. 6, in the caliper body 34, the center axis of the bore 55 of the cylinder portion 35 is parallel to the center axis of the disk 20. That is, the caliper body 34 has an axial direction of the cylinder portion 35 that coincides with the disk axial direction.

  The cylinder bottom portion 51 is a bore bottom of the cylinder portion 35. The extending part 201 is continuous with the cylinder bottom part 51 on the first end side. The extending part 201 further extends from the cylinder bottom part 51 in the direction away from the disk 20 along the disk axial direction. In this way, the extending portion 201 is provided away from the bottom surface of the bore 55. An arrangement hole 56 having a circular cross section is formed in the extending portion 201. The arrangement hole 56 is along a direction orthogonal to the axial direction of the cylinder portion 35. Further, a communication hole 57 is formed in the cylinder bottom portion 51 and the extension portion 201. The communication hole 57 is along the axial direction of the cylinder portion 35. The communication hole 57 penetrates from the center position of the bottom surface of the bore 55 to the arrangement hole 56. The communication hole 57 is formed so as to communicate the bore 55 of the cylinder part 35 and the arrangement hole 56 of the extension part 201. The arrangement hole 56 and the communication hole 57 provided in the extension part 201 constitute a hole part 304.

  A back position hole 58 is formed in the inner periphery of the bore 55 of the cylinder cylinder portion 50 of the caliper body 34. The back position hole 58 is formed on the innermost periphery of the bore 55 on the most cylinder bottom 51 side. A sliding hole 59 is formed on the inner periphery of the bore 55. The sliding hole 59 is formed closer to the cylinder opening 52 than the inner position of the inner hole 58 of the bore 55. The sliding hole 59 has a larger diameter than the back position hole 58. A seal groove 306 is formed in the vicinity of the end of the sliding hole 59 opposite to the back position hole 58. The seal groove 306 is annular. The piston seal 60 is held in the seal groove 306. The piston seal 60 seals between a piston 72 and a cylinder part 35 described later. An axial groove 64 is formed on the inner peripheral surface of the back position hole 58 of the cylinder tube portion 50. The axial groove 64 has a concave shape that is recessed in the radial direction on the inner peripheral surface of the back position hole 58 and extends in the axial direction.

  The caliper 13 has a piston 72. The piston 72 has a cylindrical portion 70 and a lid portion 71. The cylinder part 70 is cylindrical, and the cover part 71 is disk-shaped. The piston 72 is formed in a covered cylinder shape. The piston 72 is accommodated in the bore 55 of the caliper body 34. The piston 72 accommodated in the bore 55 is in a posture in which the cylinder portion 70 side is directed to the cylinder bottom portion 51 side. The bore 55 is formed in the cylinder portion 35. Specifically, the piston 72 is slidably fitted in the sliding hole 59 of the bore 55.

  The caliper 13 has boots 73. The boot 73 is provided between the inner peripheral portion of the cylinder portion 35 on the cylinder opening 52 side and the outer peripheral portion of the piston 72 on the lid portion 71 side. A boot fitting groove 307 is formed on the cylinder opening 52 side of the bore 55 of the cylinder portion 35. The boot fitting groove 307 has an annular shape. The boot 73 is fitted in the boot fitting groove 307 and the piston 72. The boot 73 covers the gap between the bore 55 of the cylinder part 35 and the piston 72 on the outside. The boot 73 can be expanded and contracted.

  In the caliper 13, a liquid introduction hole 207 is formed in the hose attachment portion 202 shown in FIG. In the caliper 13, brake fluid is introduced into the fluid introduction hole 207 from a brake hose (not shown) attached to the hose attachment portion 202. The brake fluid thus introduced into the fluid introduction hole 207 is introduced into the chamber 206 shown in FIG. The chamber 206 is located between the cylinder part 35 and the piston 72. The piston 72 is slidably fitted to the bore 55. Therefore, the hydraulic pressure of the brake fluid causes the piston 72 to slide in the sliding hole 59 of the cylinder portion 35 and move from the cylinder portion 35 toward the friction pad 12. As the piston 72 moves, the caliper 13 slides with respect to the carrier 11 and grips the pair of friction pads 12 from both sides with the piston 72 and the claw portion 37. As a result, the caliper 13 brings the pair of friction pads 12 into contact with the disk 20. In other words, the piston 72 provided on the caliper body 34 presses the pair of friction pads 12 against the disk 20.

  Here, when replacing the brake fluid, the brake fluid is introduced into the chamber 206 between the cylinder portion 35 and the piston 72 as described above. At this time, it may be necessary to vent air from the chamber 206. Therefore, as shown in FIGS. 1 to 3 and 5, a bleeder mounting portion 203 is formed on the caliper body 34 on the outer side in the disk radial direction. A bleeder 208 is attached to the bleeder attaching portion 203. The chamber 206 is evacuated through the bleeder 208.

  Normal braking is when braking is performed by depressing the brake pedal. During normal braking, the caliper 13 introduces brake fluid pressure from a master cylinder (not shown) into the chamber 206 shown in FIG. 6 via the fluid introduction hole 207 shown in FIG. The chamber 206 is located between the cylinder part 35 and the piston 72. For this reason, when the brake fluid pressure is introduced into the chamber 206, the piston 72 slides in the cylinder portion 35 and protrudes from the cylinder portion 35 toward the claw portion 37 with the introduced brake fluid pressure. Then, the piston 72 brings the pair of friction pads 12 into contact with the disk 20. Thereby, the caliper 13 generates a braking force. On the other hand, the caliper 13 has a parking brake mechanism 81 in the caliper body 34. The parking brake mechanism 81 mechanically propels the piston 72 provided on the caliper body 34 instead of the brake fluid pressure. The parking brake mechanism 81 presses the pair of friction pads 12 against the disk 20 by mechanically propelling the piston 72. Thereby, the parking brake mechanism 81 generates a braking force. In other words, the parking brake mechanism 81 is provided in the caliper body 34 to propel the piston 72. The caliper 13 is a built-in caliper that incorporates a parking brake mechanism 81.

  The parking brake mechanism 81 has a cam mechanism 82. The cam mechanism 82 is accommodated in the cylinder part 35. The cam mechanism 82 includes a bearing 83 and a rotating member 84. The bearing 83 has an arc shape and is fitted in the arrangement hole 56 of the caliper body 34. The rotating member 84 has a substantially cylindrical shape and is disposed in the arrangement hole 56. The rotating member 84 is rotatably supported by the arrangement hole 56 via a bearing 83. A cam recess 85 is formed in the rotating member 84. The cam recess 85 is recessed in a substantially V shape from the radially outer peripheral surface of the rotating member 84 toward the center. The cam recess 85 has the most recessed position offset with respect to the central axis of the rotating member 84.

  The cam mechanism 82 has a cam rod 88. One end of the cam rod 88 is inserted into the cam recess 85, and the other end is disposed in the communication hole 57. The rotating member 84 is driven to rotate around an axis line along the direction orthogonal to the axis of the cylinder portion 35. Then, the cam rod 88 changes the amount of protrusion from the rotating member 84 depending on the shape of the cam recess 85. The bottom of the cam recess 85 is offset with respect to the center of the rotating member 84. As a result, when the rotary member 84 rotates, the cam recess 85 moves back and forth with respect to the communication hole 57. Therefore, the cam recessed part 85 changes the protrusion amount to the communicating hole 57 side of the cam rod 88 which contacts the bottom part.

  The rotating member 84 is arranged in the arrangement hole 56. Here, as shown in FIG. 1, FIG. 2, and FIG. 5, a part of the rotating member 84 protrudes outward from the extending portion 201 of the caliper body 34 in the disk radial direction. A lever member 89 is connected to the protruding portion of the rotating member 84. The rotating member 84 is arranged in the arrangement hole 56 shown in FIG. The lever member 89 is connected to the rotating member 84. Thereby, the lever member 89 is arrange | positioned in the position of the extension part 201, as shown in FIG.1, FIG.2, FIG.5. The rotating member 84 is fixed to the lever member 89. Therefore, the rotating member 84 rotates integrally with the lever member 89 when the lever member 89 is driven to rotate. The extending portion 201 is provided with an arrangement hole 56 shown in FIG. As shown in FIGS. 1, 2, and 5, the rotation member 84 is disposed in the arrangement hole 56.

  As shown in FIG. 1, a stopper member 211 is fixed to the extended portion 201 of the caliper body 34 on the outer side in the disk radial direction. The stopper member 211 abuts on the abutting portion 210 of the lever member 89 and restricts further rotation of the lever member 89. The rotating member 84 is provided with a spring 212. The spring 212 urges the lever member 89 to rotate in a direction in which the lever member 89 comes into contact with the stopper member 211 at the contact portion 210. The spring 212 is supported by the rotating member 84 by inserting the rotating member 84 into the coil portion of the intermediate part. One end of the spring 212 is locked to the spring locking portion 213 of the lever member 89, and the other end is locked to the stopper member 211. The lever member 89 is formed with a wire locking portion 214. The wire locking part 214 locks the wire 15. The lever member 89 is provided with a wire locking portion 214 along with the spring locking portion 213.

  As shown in FIG. 6, the parking brake mechanism 81 has a linear motion transmission mechanism 90. The linear motion transmission mechanism 90 is accommodated in the cylinder portion 35. The linear motion transmission mechanism 90 is pressed by the cam rod 88 of the cam mechanism 82 and moves in the axial direction of the cylinder portion 35. The linear motion transmission mechanism 90 includes a push rod 91, a clutch member 92, an adjustment portion 93, a cover member 95, and a push rod biasing spring 96. The adjuster 93 adjusts the position of the push rod 91 and the clutch member 92. The cover member 95 of the linear motion transmission mechanism 90 is locked to the cylinder portion 35 by a C-shaped retaining ring 97. Thereby, the movement of the cover member 95 in the direction of the cylinder opening 52 is restricted. A ring locking groove 308 is formed in the bore 55 of the cylinder portion 35. The ring locking groove 308 is annular. The retaining ring 97 is engaged with the ring locking groove 308.

  The push rod 91 includes a distal end member 98 and a proximal end member 99. The distal end member 98 is on the disk 20 side of the push rod 91, and the proximal end member 99 is on the opposite side of the push rod 91 from the disk 20. The tip member 98 has a screw shaft portion 100 and a flange portion 101. The flange portion 101 has a substantially disk shape. A convex portion 102 is formed on the outer peripheral portion of the flange portion 101. The convex portion 102 protrudes outward in the radial direction of the flange portion 101. The convex portion 102 is fitted in the axial groove 64 of the back position hole 58 of the cylinder tube portion 50. Thereby, rotation with respect to the cylinder part 35 of the front-end | tip member 98 is controlled. The clutch member 92 has a female screw 105. The female screw 105 is screwed into the screw shaft portion 100 of the tip member 98.

  The proximal end member 99 has a shaft portion 311 and a flange portion 312. The flange portion 312 spreads radially outward from one axial end of the shaft portion 311. In the proximal end member 99, the flange portion 312 abuts on the distal end member 98. The base end member 99 is fitted so that the shaft portion 311 can slide in the communication hole 57. An annular groove 313 that is recessed radially inward from the outer peripheral surface is formed in the shaft portion 311. An annular seal member 315 is disposed in the annular groove 313. The seal member 315 seals between the shaft portion 311 and the communication hole 57. The arrangement hole 56 and the communication hole 57 constitute a hole 304. A parking brake mechanism 81 is provided in the hole 304 provided in the extension part 201. A part of the bearing 83, the rotating member 84, and the cam rod 88 is arranged in the arrangement hole 56. A part of the cam rod 88, a base end member 99, and a seal member 315 are disposed in the communication hole 57.

  In the parking brake mechanism 81, the cam mechanism 82 is rotated through a lever member 89. Thereby, the cam rod 88 presses the proximal end member 99 of the push rod 91. By this pressing, the push rod 91 and the clutch member 92 move linearly in the axial direction to press the piston 72. As a result, the piston 72 is forcibly slid toward the friction pad 12 with respect to the cylinder portion 35. That is, the parking brake mechanism 81 generates a pressing force in the moving direction of the piston 72 by the rotation input to the lever member 89. The adjusting portion 93 adjusts the screwing amount between the screw shaft portion 100 of the tip member 98 of the push rod 91 and the female screw 105 of the clutch member 92 according to the wear of the pair of friction pads 12.

  As shown in FIG. 1, the caliper 13 has a cable guide member 110. The cable guide member 110 is fixed by bolts 215 on the outer side of the guide mounting portion 39 of the caliper body 34 in the disk radial direction. The cable guide member 110 guides the routing of the cable 16 toward a parking brake input mechanism (not shown). The cable guide member 110 has a mounting base portion 111 on one end side and a cable locking portion 112 on the other end side. The attachment base portion 111 is fixed to the guide attachment portion 39. The cable locking portion 112 rises from the attachment base portion 111 in the direction opposite to the guide attachment portion 39. The cable locking portion 112 rises outward from the mounting base portion 111 in the disk radial direction. The wire 15 is included in the cable 16 and extends from the end portion of the cable 16. The cable locking portion 112 locks the connecting portion 120 at the end of the cable 16 that encloses the wire 15. The end of the wire 15 is locked to the wire locking portion 214 of the lever member 89. Therefore, the lever member 89 transmits the force from the wire 15 to the parking brake mechanism 81.

  A fitting portion 216 is formed on the attachment base portion 111 of the cable guide member 110. The fitting portion 216 is recessed from the surface of the mounting base portion 111 opposite to the guide mounting portion 39 and protrudes from the surface of the guide mounting portion 39. The mounting base portion 111 is fixed to the guide mounting portion 39 with a bolt 215. At that time, the fitting portion 216 is fitted into the guide mounting portion 39. As a result, the mounting base portion 111 is positioned with respect to the caliper body 34. The cable guide member 110 is positioned and attached to the outside of the caliper body 34 in this way.

  The caliper body 34 shown in FIGS. 7 to 11 is formed with a guide mounting portion 39 as shown in FIG. The extending part 201 has a first end side continuous to the cylinder part 35 and extends from the cylinder part 35 to the side opposite to the disk 20 along the disk axial direction. The guide attachment portion 39 is formed on the second end side in the direction away from the disk 20 of the extension portion 201. The guide attachment portion 39 protrudes from the extending portion 201 in the rotation direction of the disk 20.

  As shown in FIGS. 7, 8, and 11, the caliper body 34 is formed with a flat portion 220 on the outer side in the disk radial direction. The plane part 220 is continuously formed over both the extension part 201 and the guide attachment part 39 to form the same plane. The flat portion 220 is along the disk axial direction.

  The extension portion 201 is formed with an arrangement hole 56 and a mounting hole 221 shown in FIGS. The arrangement hole 56 and the attachment hole 221 are formed perpendicularly to the plane portion 220 within the range of the plane portion 220. The rotation member 84 shown in FIGS. 1, 2, 5, and 6 is disposed in the arrangement hole 56. The stopper member 211 shown in FIGS. 1, 3, and 5 is screwed and fixed to the mounting hole 221. The mounting hole 221 is arranged on the opposite side of the arrangement hole 56 from the cylinder portion 35 in the disk axial direction. The mounting hole 221 is disposed on the opposite side of the arrangement hole 56 from the guide mounting portion 39 in the disk rotation direction.

  The guide attachment portion 39 is formed with attachment holes 225 and fitting holes 226 shown in FIGS. The mounting hole 225 and the fitting hole 226 are formed in the range of the flat portion 220 and perpendicular to the flat portion 220. Bolts 215 for fixing the cable guide member 110 shown in FIGS. 1, 2, and 5 are screwed into the mounting holes 225. The fitting portion 216 of the cable guide member 110 shown in FIG. 1 is fitted into the fitting hole 226. The mounting hole 225 and the fitting hole 226 overlap each other in the disc rotation direction. The fitting hole 226 is disposed closer to the cylinder portion 35 in the disk axial direction than the mounting hole 225. As shown in FIG. 5, the cable guide member 110 causes the attachment base portion 111 to abut against the flat portion 220. In this state, the cable guide member 110 is attached to the caliper body 34 by the bolt 215.

  As shown in FIGS. 7 and 8, the guide attachment portion 39 overlaps the arrangement hole 56 and the attachment hole 221 of the extension portion 201 with the position in the disk axial direction. The guide attachment portion 39 is arranged adjacent to the arrangement hole 56 and the attachment hole 221 in the disk rotation direction. The end position of the arrangement hole 56 on the cylinder portion 35 side in the disk axis direction is substantially the same as the end position of the guide mounting portion 39 on the cylinder portion 35 side in the disk axis direction. As shown in FIG. 7, the communication hole 57 extends from the disposition hole 56 toward the cylinder part 35 and extends across the extension part 201 and the cylinder part 35. Therefore, the communication hole 57 is provided at a position that does not coincide with the guide mounting portion 39 in the disk axial direction. Specifically, in the disk axial direction, the communication hole 57 is provided at a position where a part of the communication hole 57 overlaps with the guide mounting part 39, but most of the communication hole 57 does not overlap with the guide mounting part 39. In other words, in the disk axial direction, the communication hole 57 is provided so as to be shifted to the cylinder portion 35 side from the guide mounting portion 39 as a whole.

  As shown in FIGS. 9 and 11, the caliper body 34 is formed with a flat portion 230 on the inner side in the disk radial direction. The flat surface portion 230 is continuously formed over both the extending portion 201 and the guide mounting portion 39 to form the same plane. The flat portion 230 is along the disk axial direction. The plane part 230 is arranged in parallel with the plane part 220. Further, as shown in FIGS. 7 to 9 and 11, the caliper body 34 is formed with a flat portion 231. The flat surface portion 231 is provided at the end position of the caliper body 34 on the side opposite to the cylinder portion 35 in the disk axial direction. The flat surface portion 231 is continuously formed over both the extending portion 201 and the guide mounting portion 39 to form the same plane. The flat surface portion 231 is orthogonal to the disk axial direction and is also orthogonal to the flat surface portions 220 and 230.

  As shown in FIGS. 7 and 8, an R chamfer 232 is formed at the boundary position of the guide attachment portion 39 and the extension portion 201 on the opposite side to the flat portion 231. The R chamfer 232 is cylindrical. The maximum protrusion height in the disk rotation direction from the extension portion 201 of the R chamfer 232 is ½ or more of the maximum protrusion height in the disk rotation direction from the extension portion 201 of the guide mounting portion 39. It is also possible to use a flat chamfer instead of the R chamfer 232.

  The extending part 201 is continuous with the cylinder part 35 on the first end side. The second end side shown in FIG. 11 in a direction away from the cylinder portion 35 (that is, the disk 20) of the extension portion 201 has a substantially rectangular shape in a cross section orthogonal to the axial direction of the cylinder portion 35 together with the guide attachment portion 39. There is no. The axial direction of the cylinder portion 35 coincides with the axial direction of the disk 20. The pressed surface 20a of the disk 20 is perpendicular to the disk axial direction. The second end side of the extending portion 201 has a substantially rectangular shape in a cross section parallel to the pressed surface 20 a of the disk 20 together with the guide mounting portion 39.

  As shown in FIG. 7, a hose attachment portion 202 is formed on the caliper body 34. The hose attachment portion 202 protrudes from the extension portion 201 to the side opposite to the guide attachment portion 39 in the disk rotation direction. The end of the extension part 201 is a flat part 231. The hose attachment portion 202 is formed so as to be shifted to the disc 20 side from the flat portion 231 in the disc axial direction. As shown in FIG. 9, the above-described liquid introduction hole 207 is formed in the hose attachment portion 202. A brake hose (not shown) is attached to the hose attachment portion 202. In the hose attachment portion 202, brake fluid from the brake hose is introduced into the fluid introduction hole 207. The liquid introduction hole 207 is inclined so as to approach the disk 20 in the disk axial direction toward the depth side in the depth direction. The liquid introduction hole 207 communicates with the bore 55 shown in FIG.

  As shown in FIGS. 7 and 9, a bleeder mounting portion 203 is formed on the caliper body 34. The bleeder mounting portion 203 is formed between the hose mounting portion 202 and the arm portion 38 in the disc axial direction of the caliper body 34. The bleeder attachment portion 203 is formed closer to the hose attachment portion 202 than the center position of the cylinder portion 35 in the disk rotation direction. The bleeder mounting portion 203 is formed with a bleeder mounting hole 241 for mounting the bleeder 208 shown in FIGS. The bleeder mounting hole 241 communicates with the bore 55 shown in FIG. Further, as shown in FIGS. 10 and 11, the caliper body 34 is formed with pin attachment holes 242 in each of the pair of arm portions 38. The slide pins 30 shown in FIG. 1 are attached to the pin attachment holes 242, respectively.

  The caliper body 34A shown in FIGS. 12 to 16 is in a material state after casting and before machining other than the flat portion 231. As shown in FIG. 15, the caliper body 34A includes a cylinder part 35A in which a pilot hole 55A including a pilot hole 58A and a pilot hole 59A and a pilot hole 57A are formed by casting, a bridge part 36, and a claw part 37A. ,have. The prepared hole 58A is a state before the back position hole 58 is machined. The prepared hole 59A is a state before the sliding hole 59 is machined. Therefore, the prepared hole 55A is in a state before the bore 55 is machined. The prepared hole 57A is in a state before the communication hole 57 is machined. As shown in FIGS. 13 and 14, the claw portion 37A is in a state before the cylinder portion 35A side of the claw portion 37 is surface-finished and the facing surface 302 shown in FIGS. 8 and 9 is formed.

  Further, the caliper body 34A in the material state includes a pair of arm portions 38A as shown in FIGS. 15 and 16, an extension portion 201A, a guide attachment portion 39A, and a hose attachment portion 202A as shown in FIG. And a bleeder mounting portion 203A. The pair of arm portions 38A is in a state before both surfaces of the pair of arm portions 38 in the disk axial direction are subjected to surface processing. The pair of arm portions 38A is in a state before the pair of pin attachment holes 242 shown in FIGS. The extending part 201A is in a state before the planar part 220 shown in FIGS. 7 to 9 and 11 is formed by surface processing of the extending part 201. The extension portion 201A is in a state before the arrangement hole 56, the communication hole 57, and the attachment hole 221 shown in FIGS. The guide attachment portion 39A is in a state before the planar portion 220 shown in FIGS. 7 to 9 and 11 is formed by surface processing of the guide attachment portion 39. The guide attachment part 39A is in a state before the attachment hole 225 and the fitting hole 226 shown in FIGS. The hose attachment portion 202A is in a state before the liquid introduction hole 207 shown in FIG. The bleeder mounting portion 203A is in a state before the bleeder mounting hole 241 shown in FIGS.

  As shown in FIGS. 14 and 16, a flat portion 230 is formed by casting on the extending portion 201 </ b> A and the guide attachment portion 39 </ b> A. As shown in FIGS. 12 and 13, an R chamfer 232 is formed by casting between the extending part 201A and the guide attaching part 39A in the extending part 201A and the guide attaching part 39A. That is, the flat portion 230 of the caliper body 34 shown in FIGS. 9 and 11 and the R chamfer 232 shown in FIGS. 7 and 8 are formed by casting. As shown in FIG. 12, also in the caliper body 34A in the raw material state, the maximum protrusion height in the disc rotation direction from the extending portion 201A of the R chamfer 232 is the disc rotating direction from the extending portion 201A of the guide mounting portion 39A. It is more than 1/2 of the maximum protrusion height. The window hole 301 of the bridge part 36 is also formed by casting. The window hole 301, the plane portion 230, and the R chamfer 232 of the bridge portion 36 are not machined but are formed by casting.

  The caliper body 34A is cast by a mold. In this mold, a portion for forming the claw portion 37A of the caliper body 34A is disposed in the lower portion, and a portion for forming the extension portion 201A and the guide attachment portion 39A is disposed in the upper portion. The mold is formed so that a gate is arranged above the portions that form the extending portion 201A and the guide mounting portion 39A. Molten metal is poured into the mold from the gate. The poured molten metal includes a portion for forming the claw portion 37A of the mold, a portion for forming the bridge portion 36, a portion for forming the cylinder portion 35A and the pair of arm portions 38A, a portion for forming the extending portion 201A, Are filled in this order. Then, the caliper body 34A in the raw material state cast by such a mold is machined to obtain the caliper body 34 having the above shape. In the caliper body 34A in the raw material state, the cross-sectional area of the extension portion 201A on the mold gate side and the guide attachment portion 39A in the plane perpendicular to the disk axial direction is such that the pilot hole 59A of the cylinder portion 35A shown in FIG. It is larger than the cross-sectional area of the formed portion in the plane orthogonal to the disk axial direction.

  A parking brake input mechanism (not shown) includes a parking brake lever for manual operation, a parking brake pedal for stepping operation, an electric cable puller driven by a motor, and the like. With this parking brake input mechanism, the wire 15 is pulled in a direction to reduce the extension amount with respect to the cable 16 shown in FIG. When the wire 15 is pulled with respect to the cable 16, the lever member 89 and the rotating member 84 rotate together. Then, in the parking brake mechanism 81, the rotating member 84 presses the push rod 91 via the cam rod 88 shown in FIG. As the push rod 91 is pressed, the clutch member 92 moves linearly in the axial direction and presses the piston 72. Accordingly, the clutch member 92 forcibly slides the piston 72 toward the friction pad 12 with respect to the cylinder portion 35. As a result, the piston 72 and the claw portion 37 press the pair of friction pads 12 against the disk 20 to generate a braking force. Therefore, the cable 16 and the wire 15 shown in FIG. 1 are for the operation of the parking brake mechanism 81.

  Patent Document 1 discloses that a gate is arranged at a portion where a parking brake mechanism mounting portion of a mold is formed when a caliper body is cast. This is because defects such as sink marks are likely to occur at the gate. However, if the volume near the gate of the caliper body, that is, the volume of the mold cavity that forms the vicinity of the gate of the caliper body cannot be secured, defects such as sink marks may occur in addition to the gate portion. For example, if a nest is generated in the cylinder tube portion 50, the sealing performance may not be ensured despite the piston seal 60 being disposed between the cylinder 72 and the piston 72. Further, for example, when a sink nest is generated at the position of the communication hole 57, there is a possibility that the sealing performance cannot be secured even though the seal member 315 is disposed on the base end member 99.

  On the other hand, in the disc brake 10 of the first embodiment, the cylinder part 35, the extension part 201, and the guide attachment part 39 of the caliper body 34 are integrally formed by casting. The extending part 201 is continuous with the cylinder bottom part 51, which is the bore bottom of the cylinder part 35, and extends in a direction away from the disk 20. The extension portion 201 is provided with a lever member 89 of the parking brake mechanism 81. The guide attachment portion 39 is formed so as to protrude from the extension portion 201 in the rotation direction of the disc 20 on the second end side in the direction away from the disc 20 of the extension portion 201. The cable guide member 110 is fixed to the guide attachment portion 39. And this 2nd end side of the extension part 201 has comprised the substantially rectangular shape in the cross section parallel to the to-be-pressed surface 20a of the disk 20 with the guide attachment part 39. FIG.

  Thus, on the end side of the portion of the caliper body 34 that extends from the cylinder bottom 51 to the side opposite to the disk 20, the guide attachment that protrudes in the rotation direction of the disk 20 from the extension part 201 in addition to the extension part 201. A portion 39 is provided. The guide attachment portion 39 has a substantially rectangular cross section with the extension portion 201. For this reason, the volume on the end side of the portion extending from the cylinder bottom 51 to the opposite end side to the disk 20 can be secured. At the time of casting, a gate is set at a portion on the opposite side to the disk 20 of the portion forming the extension portion 201A of the mold cavity and the guide attachment portion 39A. Thereby, coagulation | solidification of the extension part 201A used as a weir and the guide attachment part 39A can be delayed. Therefore, defects such as sink marks can be intensively generated in the extending portion 201A and the guide mounting portion 39A with less influence. As a result, it is possible to suppress the occurrence of defects such as sink marks in other portions such as the cylinder portion 35. Therefore, the influence of defects such as sink marks can be suppressed.

  In addition, a portion that forms the claw portion 37A of the mold cavity is disposed on the lower side in the vertical direction, and a portion that forms the extension portion 201A and the guide attachment portion 39A is disposed on the upper side in the vertical direction. And a gate is set above the part which forms the extension part 201A and guide attachment part 39A of the cavity of a metal mold | die. Thereby, since the volume of the upper part of a cavity can be enlarged, the effect as a hot water at the time of gravity casting becomes high, and generation | occurrence | production of a nest can be suppressed.

  Moreover, since the thickness of the guide attachment part 39 can be ensured, the rigidity can be efficiently increased. Therefore, the weight of the entire caliper 13 can be reduced.

  In addition, an arrangement hole 56 in which the rotation member 84 connected to the lever member 89 is arranged is formed in the extension portion 201. In addition, the guide attaching portion 39 is arranged in the extending portion 201 adjacent to the arrangement hole 56 in the disk rotation direction. For this reason, an increase in the length of the caliper body 34 in the disk axial direction can be suppressed.

  Further, a communication hole 57 provided in the cylinder portion 35 and the extension portion 201 so as to communicate the bore 55 and the arrangement hole 56 is provided at a position that does not coincide with the guide attachment portion 39 in the disk axial direction. For this reason, it is possible to suppress the occurrence of defects such as sink marks around the communication hole 57.

  Further, an R chamfer 232 is formed at the boundary position of the guide attachment portion 39 and the extension portion 201 on the opposite side to the flat surface portion 231. The R chamfer 232 is formed with a height of ½ or more of the height of the guide attachment portion 39 from the extension portion 201. For this reason, the entrainment of hot water during pouring can be suppressed, and the occurrence of a hot water boundary can be suppressed.

[Second Embodiment]
Next, a second embodiment according to the present invention will be described mainly on the difference from the first embodiment based on FIGS. In addition, about the site | part common to 1st Embodiment, it represents with the same name and the same code | symbol.

  As shown in FIGS. 17 to 19 and FIGS. 21 to 23, the caliper body 34 is provided with an extending portion 201 also in the second embodiment. As shown in FIG. 23, the extending part 201 is continuous with the cylinder bottom part 51 on the first end side. The extending part 201 further extends from the cylinder bottom part 51 in the direction away from the disk 20 along the disk axial direction.

  In the second embodiment, a part of the rotating member 84 protrudes inward in the disk radial direction from the extended portion 201 of the caliper body 34 as shown in FIGS. 19, 21, and 22. A lever member 89 is connected to the protruding portion of the rotating member 84. As shown in FIGS. 18, 21, and 22, a stopper member 211 is fixed to the extending portion 201 of the caliper body 34 on the inner side in the disk radial direction.

  In the second embodiment, the cable guide member 110 shown in FIGS. 17 to 22 is fixed with bolts 215 on the inner side in the disk radial direction of the guide mounting portion 39 as shown in FIGS. 19, 21, and 22. The cable locking portion 112 of the cable guide member 110 extends inward in the disk radial direction from the attachment base portion 111.

  In the second embodiment, as shown in FIGS. 24, 26, and 29, the guide attachment portion 39 of the caliper body 34 is formed on the second end side in the direction away from the disk 20 of the extension portion 201. Absent. The guide attachment portion 39 is formed so as to be shifted from the second end side of the extending portion 201 to the first end side. The guide attachment portion 39 protrudes from the extending portion 201 in the rotation direction of the disk 20.

  In the second embodiment, as shown in FIGS. 26, 28, and 29, a flat portion 321 is formed on the inner side in the disk radial direction of the guide mounting portion 39. The flat surface portion 321 is along the disk axial direction. A flat portion 322 is formed on the inner side of the extending portion 201 in the disk radial direction. The flat surface portion 322 is along the disk axial direction. The plane part 321 and the plane part 322 are arranged in parallel. The flat surface portion 321 is arranged on the outer side in the disk radial direction than the flat surface portion 322. The plane portions 321 and 322 are orthogonal to the plane portion 231 that is orthogonal to the disk axial direction. Nothing is attached to the flat surface portion 220 on the outer side in the disk radial direction of the extending portion 201. Holes are not formed in the flat portion 220.

  As shown in FIG. 29, the arrangement hole 56 and the attachment hole 221 are formed perpendicular to the plane portion 322 within the range of the plane portion 322 of the extending portion 201. In the second embodiment, the mounting hole 225 and the fitting hole 226 are formed perpendicular to the flat surface portion 321 within the range of the flat surface portion 321 of the guide mounting portion 39. As shown in FIG. 21, the cable guide member 110 causes the mounting base portion 111 to abut on the flat surface portion 321. In this state, the cable guide member 110 is attached to the caliper body 34 by the bolt 215.

  Also in the second embodiment, the extending portion 201 is continuous with the cylinder portion 35 on the first end side. A second end side shown in FIG. 28 in a direction away from the cylinder portion 35 (that is, the disk 20) of the extending portion 201 has a substantially rectangular shape in a cross section orthogonal to the axial direction of the cylinder portion 35. The second end side of the extending portion 201 has a substantially rectangular shape in a cross section parallel to the pressed surface 20 a of the disk 20.

  In the second embodiment, as shown in FIGS. 24 to 26 and 28, the hose attachment portion 202 protrudes from the extension portion 201 to the same side as the guide attachment portion 39 in the disk rotation direction. The hose attachment portion 202 protrudes outward from the extending portion 201 in the disk radial direction. The hose attachment portion 202 is disposed between the extension portion 201 and the guide attachment portion 39. The hose attachment portion 202 is continuous with the extension portion 201 and the guide attachment portion 39.

  In the second embodiment, as shown in FIGS. 17 to 19, 23, and 24, the bleeder mounting portion 203 is formed as a whole at the position of the cylinder portion 35 in the disc axial direction of the caliper body 34. The bleeder mounting portion 203 is formed at the center position of the cylinder portion 35 in the disk rotation direction. The bleeder mounting hole 241 is formed in the disk radial direction.

  Regarding the caliper body 34 of the second embodiment, a cross-sectional area of a cross section taken along a plane parallel to the pressed surface 20a of the disk 20 will be seen. Then, the first minimum cross-sectional area that is the minimum of the cross-sectional areas in the range from the cylinder part 35 to the extension part 201 is equal to or greater than the second minimum cross-sectional area that is the minimum of the bridge part 36. ing.

  Here, the first minimum cross-sectional area is a cross-sectional area including the cross-sectional area of the hole 304. That is, in the first minimum cross-sectional area, the arrangement hole 56 that opens to the outside of the caliper body 34, the mounting hole 221, the mounting hole 225, the fitting hole 226, the bleeder mounting hole 241, and the communication hole 57 are not formed. This is the minimum cross-sectional area assuming that

  On the other hand, the second minimum cross-sectional area is a cross-sectional area not including the cross-sectional area of the window hole 301 of the bridge portion 36. That is, the second minimum cross-sectional area is a cross-sectional area of only a real part of the bridge portion 36.

  The first minimum cross-sectional area is a cross-sectional area in the immediate vicinity of the flat portion 231 of the extending portion 201. The first minimum cross-sectional area is equivalent to the surface area of the flat portion 231. Therefore, the surface area of the flat portion 231 is equal to or greater than the second minimum cross-sectional area. The second minimum cross-sectional area is the cross-sectional area of the portion of the bridge portion 36 where the window hole 301 is formed.

  The inner diameter of the hole 304 is the inner diameter of the arrangement hole 56 and the communication hole 57. The inner diameter of the arrangement hole 56 is larger than the inner diameter of the communication hole 57. Of the inner diameters of the holes 304, the inner diameter of the arrangement hole 56 is the largest. The inner diameter of the bore 55 of the cylinder part 35 is the inner diameter of the back position hole 58, the sliding hole 59, the seal groove 306, the boot fitting groove 307, and the ring locking groove 308. The inner diameter of the sliding hole 59 is larger than the inner diameter of the back position hole 58. The inner diameter of the ring locking groove 308 is larger than the inner diameter of the sliding hole 59. The inner diameter of the seal groove 306 is larger than the inner diameter of the ring locking groove 308. The maximum inner diameter of the boot fitting groove 307 is larger than the inner diameter of the seal groove 306. Of the inner diameter of the bore 55, the inner diameter of the back position hole 58 is the smallest. Of the inner diameters of the holes 304, the inner diameter of the arrangement hole 56 is smaller than any of the inner diameters of the back position hole 58, the sliding hole 59, the seal groove 306, the boot fitting groove 307, and the ring locking groove 308. The maximum inner diameter of the hole 304 is smaller than the minimum inner diameter of the bore 55.

  As shown in FIG. 23, the extending portion 201 has a minimum portion 331 that is the minimum distance from the central axis of the cylinder portion 35 in its outer shape portion. The central axis of the cylinder part 35 and the central axis of the communication hole 57 coincide. The minimum portion 331 is provided inside the extending portion 201 in the disk radial direction. The minimum portion 331 is provided at a position overlapping the communication hole 57 in the disk axial direction. The distance from the central axis of the cylinder part 35 to the minimum part 331 is equal to or greater than the radius of the sliding hole 59 of the bore 55. The distance from the central axis of the cylinder part 35 to the minimum part 331 is equal to or greater than the radius of the deep position hole 58 of the bore 55. That is, the distance from the central axis of the cylinder portion 35 to the minimum portion 331 is equal to or greater than the half value of the minimum inner diameter of the bore 55.

  In the second embodiment, the caliper body 34 </ b> A shown in FIGS. 30 to 35 is in a material state after casting and before machining other than the flat portion 231. The caliper body 34A includes a cylinder portion 35A, a bridge portion 36, a claw portion 37A, a pair of arm portions 38A, an extension portion 201A, a guide attachment portion 39A, a hose attachment portion 202A, and a bleeder attachment portion 203A. ,have.

  The extension part 201A of the caliper body 34A is in a state before the flat part 322 shown in FIGS. 26, 28, and 29 is formed by surface processing of the extension part 201. The extension part 201A is in a state before the arrangement hole 56, the communication hole 57, and the attachment hole 221 shown in FIG. The guide attachment portion 39A is in a state before the planar portion 321 shown in FIGS. 26, 28, and 29 is formed by surface processing of the guide attachment portion 39. The guide attachment portion 39A is a state before the attachment holes 225 and the fitting holes 226 shown in FIGS. 26 and 29 are formed in the guide attachment portion 39. The hose attachment portion 202A is in a state before the liquid introduction hole 207 shown in FIGS. 24, 26, and 28 is formed in the hose attachment portion 202. The bleeder mounting portion 203A is in a state before the bleeder mounting hole 241 shown in FIGS. 23 and 24 of the bleeder mounting portion 203 is formed. As shown in FIGS. 30, 31, and 34, a flat portion 220 is formed on the extending portion 201A by casting.

  Regarding the caliper body 34 </ b> A of the second embodiment, the cross-sectional area of a cross section cut by a plane parallel to the pressed surface 20 a of the disk 20 will be seen. The first minimum sectional area that is the smallest of the sectional areas in the range from the cylinder part 35A to the extending part 201A is equal to or greater than the second smallest sectional area that is the minimum of the bridge part 36. . Here, the first minimum cross-sectional area is a cross-sectional area including the cross-sectional area of the pilot hole 57A. The second minimum cross-sectional area of the caliper body 34A is the same as the second minimum cross-sectional area of the caliper body 34. The first minimum cross-sectional area is a cross-sectional area in the immediate vicinity of the flat portion 231 of the extending portion 201A. The first minimum cross-sectional area is equivalent to the surface area of the flat portion 231.

  The caliper body 34A of the second embodiment is also cast by a mold. In this mold, a portion for forming the claw portion 37A of the caliper body 34A is disposed in the lower portion, and a portion for forming the extending portion 201A is disposed in the upper portion. The mold is formed so that the gate is arranged above the portion that forms the extending portion 201A. Molten metal is poured into the mold from the gate. The molten metal thus poured includes a part for forming the claw part 37A of the mold, a part for forming the bridge part 36, a part for forming the cylinder part 35A and the pair of arm parts 38A, an extension part 201A and a guide attachment part 39A. Are filled in the order of the portion that forms the first portion and the portion that forms only the extending portion 201A. Then, the caliper body 34A in the raw material state cast by such a mold is machined to obtain the caliper body 34 having the above shape.

  In the disc brake 10 of the second embodiment, the cylinder portion 35 and the extension portion 201 of the caliper body 34 are integrally formed by casting. The extending part 201 is continuous at one end side with the cylinder bottom part 51, which is the bore bottom of the cylinder part 35, and extends in a direction away from the disk 20. The extension part 201 includes a hole 304 in which the parking brake mechanism 81 is provided. The caliper body 34 of the second embodiment has the smallest cross-sectional area including the cross-sectional area of the hole 304 in the section from the cylinder part 35 to the extension part 201 in the cross section parallel to the pressed surface 20a of the disk 20. Is equal to or greater than the minimum cross-sectional area of the bridge portion 36.

  Thereby, the volume of the extension part 201 extended from the cylinder bottom part 51 to the opposite end side from the disk 20 is securable. Then, at the time of casting, a gate is set at a portion on the side opposite to the disk 20 of the portion forming the extending portion 201A of the cavity of the mold. Thereby, solidification on the opposite side to the cylinder bottom part 51 of the extension part 201A used as the upstream of the flow of the molten metal in a metal mold | die can be delayed. Therefore, defects such as sink marks can be intensively generated on the opposite side to the cylinder portion 35A of the extending portion 201A with less influence. As a result, the occurrence of defects such as sink marks in other portions such as the cylinder portion 35 and the extension portion 201 can be suppressed. Therefore, the influence of defects such as sink marks can be suppressed. Moreover, since the volume of the upper part of a cavity can be enlarged, the effect as a hot water at the time of gravity casting becomes high, and generation | occurrence | production of a nest can be suppressed.

  Further, the maximum inner diameter of the hole portion 304 is smaller than the inner diameter of the sliding hole 59 of the cylinder portion 35. Nevertheless, the minimum distance from the center of the cylinder part 35 of the outer shape of the extension part 201 is equal to or greater than the radius of the sliding hole 59 of the bore 55 of the cylinder part 35. Thereby, the volume of the extension part 201 extended from the cylinder bottom part 51 to the opposite end side from the disk 20 is securable. Therefore, solidification on the cylinder bottom 51A side of the extension 201A can be delayed. Therefore, defects such as sink marks can be intensively generated on the flat surface portion 231 side of the extending portion 201A with less influence. As a result, it is possible to suppress the occurrence of defects such as sink marks in other portions such as the cylinder portion 35. Therefore, the influence of defects such as sink marks can be suppressed.

  As the disc brake based on the embodiment described above, for example, the following modes can be considered.

  A first aspect of the disc brake of the embodiment includes a caliper body provided with a piston that presses at least a pair of friction pads against the disc, a parking brake mechanism provided in the caliper body to propel the piston, and the parking A disc brake having a lever member that transmits a force from a wire to a brake mechanism, and a cable guide member that is attached to the outside of the caliper body and engages a cable that includes the wire. The caliper body is disposed on one side in the axial direction of the disk, and a cylinder part in which a bore for accommodating the piston is formed, and a first end side is continuous with a bore bottom of the cylinder part, An extending portion that extends in a direction away from the lever and is provided with the lever member and a guide attachment portion to which the cable guide member is fixed are integrally formed. The guide attachment portion is formed to protrude from the extension portion in the rotation direction of the disc on the second end side in the direction away from the disc of the extension portion. The second end side of the extension portion, together with the guide attachment portion, has a substantially rectangular shape in a cross section parallel to the pressed surface of the disk. Therefore, defects such as sink marks can be generated in the extending portion and the guide mounting portion with less influence. Therefore, the influence of defects such as sink marks can be suppressed.

  According to a second aspect of the disc brake of the embodiment, in the first aspect, the extension portion is formed with an arrangement hole in which a rotating member connected to the lever member is arranged. The guide attachment portion is arranged adjacent to the arrangement hole. Therefore, an increase in the length of the caliper body in the disk axial direction can be suppressed.

  According to a third aspect of the disc brake of the embodiment, in the second aspect, the cylinder portion and the extension portion are provided with a communication hole that communicates the bore of the cylinder portion and the arrangement hole. . The communication hole is provided at a position that does not coincide with the guide mounting portion in the axial direction of the disk. Therefore, it is possible to suppress the occurrence of defects such as sink marks around the communication hole.

  A fourth aspect of the disc brake according to the embodiment includes a caliper body provided with a piston that presses at least a pair of friction pads against the disc, a parking brake mechanism provided in the caliper body to propel the piston, and the parking A disc brake having a lever member that transmits a force from a wire to a brake mechanism, and a cable guide member that is attached to the outside of the caliper body and engages a cable that includes the wire. The caliper body is disposed on one side in the axial direction of the disc, and has a cylinder portion in which a bore for accommodating the piston is formed, and extends from the cylinder portion in the disc axial direction so as to straddle the outer peripheral side of the disc. A bridge portion formed, a claw portion extending from the bridge portion in a disk radial direction and formed with a facing surface facing the pressed surface of the disk, and one end side continuous with the bore bottom of the cylinder section, And an extending portion that includes a hole portion that extends in a direction away from the hole and is provided with the parking brake mechanism. In the cross section parallel to the pressed surface of the disk, the cross sectional area where the cross sectional area including the cross sectional area of the hole portion from the cylinder portion to the extending portion is minimum is the minimum of the bridge portion. Is equal to or greater than the cross-sectional area. Therefore, defects such as sink marks can be generated on the side opposite to the cylinder portion of the extending portion with less influence. Therefore, the influence of defects such as sink marks can be suppressed.

  According to a fifth aspect of the disc brake of the embodiment, in the fourth aspect, the extension portion has an inner diameter of the hole portion smaller than an inner diameter of a sliding hole in which the piston of the bore of the cylinder portion slides. The minimum distance from the center of the cylinder part of the outer shape is equal to or greater than the radius of the sliding hole. Therefore, defects such as sink marks can be generated on the side opposite to the cylinder portion of the extending portion with less influence. Therefore, the influence of defects such as sink marks can be suppressed.

  According to the disc brake described above, it is possible to suppress the influence of defects such as sink marks.

DESCRIPTION OF SYMBOLS 10 Disc brake 12 Friction pad 13 Caliper 15 Wire 16 Cable 20 Disc 20a Pressed surface 34 Caliper body 35 Cylinder part 36 Bridge part 37 Claw part 39 Guide attachment part 51 Cylinder bottom part (bore bottom)
55 Bore 56 Arrangement hole 57 Communication hole 72 Piston 81 Parking brake mechanism 84 Rotating member 89 Lever member 110 Cable guide member 201 Extension part 302 Opposing surface 304 Hole part

Claims (5)

A caliper body provided with a piston for pressing at least a pair of friction pads against the disk;
A parking brake mechanism provided in the caliper body to propel the piston;
A lever member for transmitting force from the wire to the parking brake mechanism;
A cable guide member attached to the outside of the caliper body and locking the cable containing the wire;
A disc brake having
The caliper body is
A cylinder part disposed on one side in the axial direction of the disk and formed with a bore for accommodating the piston;
A first end side is continuous with the bore bottom of the cylinder part, and extends in a direction away from the disk, and an extension part provided with the lever member;
A guide mounting portion to which the cable guide member is fixed;
Is integrally formed,
The guide mounting portion is formed to project from the extension portion in the rotation direction of the disk on the second end side in the direction away from the disk of the extension portion,
The second end side of the extension portion is a disc brake having a substantially rectangular shape in a cross section parallel to the pressed surface of the disc together with the guide mounting portion. The extension portion is formed with an arrangement hole in which a rotating member connected to the lever member is arranged,
The disc brake according to claim 1, wherein the guide attachment portion is disposed adjacent to the arrangement hole. The cylinder part and the extension part are provided with a communication hole that communicates the bore of the cylinder part and the arrangement hole,
The disc brake according to claim 2, wherein the communication hole is provided at a position that does not coincide with the guide mounting portion in the axial direction of the disc. A caliper body provided with a piston for pressing at least a pair of friction pads against the disk;
A parking brake mechanism provided in the caliper body to propel the piston;
A lever member for transmitting force from the wire to the parking brake mechanism;
A cable guide member attached to the outside of the caliper body and locking the cable containing the wire;
A disc brake having
The caliper body is
A cylinder part disposed on one side in the axial direction of the disk and formed with a bore for accommodating the piston;
A bridge part formed so as to extend from the cylinder part in the disk axial direction and straddle the outer peripheral side of the disk;
A claw portion formed with an opposing surface extending from the bridge portion in the disk radial direction and facing the pressed surface of the disk;
An extension part including a hole part in which one end side continues to the bore bottom of the cylinder part and extends away from the disk, and the parking brake mechanism is provided;
In the cross section parallel to the pressed surface of the disk, the cross sectional area where the cross sectional area including the cross sectional area of the hole portion from the cylinder portion to the extending portion is minimum is the minimum of the bridge portion. Disc brake that is equal to or greater than the cross-sectional area.   The extending portion has an inner diameter of the hole portion smaller than an inner diameter of a sliding hole in which the piston of the bore of the cylinder portion slides, and a minimum distance from the center of the cylinder portion of the outer shape is the sliding hole. The disc brake according to claim 4, wherein the disc brake is equal to or greater than the radius of the disc brake.

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