Disc brake

Abstract

To provide a disc brake that can reduce costs.SOLUTION: A disc brake comprises: a caliper that is supported on an attachment member and presses friction pads 26, 27 against a disc 11; and a pad spring 24 having a return spring part 113 which extends from a curved plate part 151 connected to a base part 111 which is attached to the attachment member, and energizes the friction pads 26, 27 in a return direction, in which the friction pads 26, 27 separate from the disc 11. In a portion opposite the disc 11 when separated from the curved plate part 151, the return spring part 113 has an abrasion detection part 156 which makes sliding contact with the disc 11 to indicate the abrasion states of linings of the friction pads 26, 27 when abrasion losses of the linings exceed a preset abrasion loss.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a disc brake. [Background technology]

[0002] 2. Description of the Related Art There is a disc brake having a pad spring that is attached to a mounting member, movably supports a friction pad, and biases the friction pad in a direction away from the disc (see, for example, Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent Application Publication No. 2023 / 0009184 [Patent Document 2] US Patent Application Publication No. 2023 / 0059238 [Patent Document 3] U.S. Pat. No. 1,142,8282 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in disc brakes, it is desirable to reduce costs.

[0005] An object of the present invention is to provide a disc brake that makes it possible to reduce costs. [Means for solving the problem]

[0006] One aspect of the disc brake according to the present invention is a disc brake comprising: a mounting member attached to a non-rotating part of a vehicle and having a torque receiving portion in the rotational direction of the disc; a friction pad movable in the axial direction of the disc; a caliper supported by the mounting member and pressing the friction pad against the disc; and a pad spring extending from a curved plate portion connected to a base attached to the mounting member and having a return spring portion for urging the friction pad in a return direction away from the disc, wherein the return spring portion is formed with a wear detection portion at a portion facing the disc away from the curved plate portion, which comes into sliding contact with the disc when the amount of wear of the lining of the friction pad exceeds a preset set amount of wear, thereby indicating the wear state of the lining. Effect of the Invention

[0007] According to the present invention, it is possible to reduce costs. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a disk brake according to a first embodiment. [Diagram 2] FIG. 1 is a front view showing a disc brake according to a first embodiment. [Diagram 3] 1 is a cross-sectional view showing a disk brake according to a first embodiment. [Figure 4] FIG. 2 is a partially enlarged front view showing the disc brake according to the first embodiment. [Diagram 5] FIG. 2 is a perspective view showing a first pad spring and a second pad spring of the disc brake according to the first embodiment. [Figure 6] FIG. 2 is a front view showing a first pad spring of the disc brake according to the first embodiment. [Figure 7] FIG. 2 is a front view showing a first pad spring of the disc brake of the first embodiment, showing a state in which the first pad spring is pressed by an ear portion of a first friction pad and an ear portion of a second friction pad. [Figure 8]FIG. 2 is a front view showing a first pad spring of the disc brake of the first embodiment, showing a state in which the first pad spring is pressed by an ear portion of a first friction pad and an ear portion of a second friction pad. [Figure 9] FIG. 11 is a perspective view showing a first pad spring and a second pad spring of a disc brake according to a second embodiment. [Figure 10] FIG. 11 is a front view showing a first pad spring and a second pad spring of a disc brake according to a second embodiment. [Figure 11] FIG. 11 is a perspective view showing a first pad spring and a second pad spring of a disc brake according to a third embodiment. [Figure 12] FIG. 11 is a front view showing a first pad spring and a second pad spring of a disc brake according to a third embodiment. [Figure 13] FIG. 11 is a front view showing a first pad spring of a disc brake according to a third embodiment, illustrating a state in which the first pad spring is pressed by an ear portion of a first friction pad and an ear portion of a second friction pad. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [First embodiment] The first embodiment will be described below with reference to FIGS. A disc brake 10 according to a first embodiment shown in Figures 1 to 3 is for use in a vehicle such as an automobile, and applies a braking force to the vehicle. Specifically, the disc brake 10 is for use in braking a four-wheeled vehicle. The disc brake 10 brakes the vehicle by stopping the rotation of a circular disc 11 that rotates together with a wheel (not shown).

[0010] As shown in FIG. 1, the disc brake 10 includes a mounting member 20, a caliper 21, a first pin boot 22, a second pin boot 23, a first pad spring 24 (pad spring), a second pad spring 25 (pad spring), an inner side friction pad 26 (friction pad), and an outer side friction pad 27 (friction pad).

[0011] Hereinafter, the central axis of rotation of the disc 11 is referred to as the disc axis. The direction in which the disc axis extends is referred to as the disc axial direction. The radial direction of the disc 11 in the disc brake 10 is referred to as the disc radial direction. The direction of rotation of the disc 11 in the disc brake 10, i.e., the circumferential direction, is referred to as the disc rotation direction. The central axis side of the disc 11 in the disc radial direction is referred to as the disc radial inner side. The opposite side of the central axis of the disc 11 in the disc radial direction is referred to as the disc radial outer side. The center side of the length in the disc rotation direction in the disc brake 10 is referred to as the disc rotation inner side. The opposite side of the center of the length in the disc rotation direction in the disc brake 10 is referred to as the disc rotation outer side. A line passing through the disc axis and the center of the mounting member 20 and the caliper 21 in the disc rotation direction along the disc radial direction is referred to as the radial reference line. This radial reference line is perpendicular to the disc axis. A plane including this radial reference line and the disc axis is referred to as the radial reference plane.

[0012] The outer side in the vehicle width direction of the vehicle provided with this disc brake 10 is referred to as the outer side. The inner side in the vehicle width direction of the vehicle provided with this disc brake 10 is referred to as the inner side. The exit side of the rotation direction R of the disc 11 in the disc brake 10 when the vehicle provided with this disc brake 10 is traveling forward is referred to as the disc rotation direction exit side. The entrance side of the rotation direction R of the disc 11 in the disc brake 10 when the vehicle provided with this disc brake 10 is traveling forward is referred to as the disc rotation direction entry side.

[0013] The mounting member 20 is provided on the vehicle, straddling the outer periphery of the disk 11. In this state, the mounting member 20 is attached to a non-rotating portion (not shown) of the vehicle. As shown in Figs. 1 and 2, the mounting member 20 includes an inner-side arrangement portion 31, an outer-side arrangement portion 32, and a pair of first and second connecting portions 33 and 34 that connect these portions. The mounting member 20 has a shape that is mirror symmetrical with respect to a radial reference plane.

[0014] 3, the disk 11 has an inner-side sliding surface 11a (sliding surface) on one side in the disk axial direction and an outer-side sliding surface 11b (sliding surface) on the other side in the disk axial direction. The inner-side sliding surface 11a is disposed on the inner side of the disk 11. The outer-side sliding surface 11b is disposed on the outer side of the disk 11.

[0015] The inner-side portion 31 is disposed on one side of the disk 11 in the disk axial direction and attached to a non-rotating portion of the vehicle. Here, the non-rotating portion of the vehicle to which the mounting member 20 is attached is disposed on the inner side of the disk 11. Therefore, the inner-side portion 31 attached to this non-rotating portion is also disposed on the inner side of the disk 11. The inner-side portion 31 faces the inner-side sliding surface 11a of the disk 11. The inner-side portion 31 supports the inner-side friction pad 26 shown in FIG. 1 so as to be movable in the disk axial direction. In other words, the inner-side friction pad 26 is movable in the disk axial direction. The inner-side friction pad 26 is disposed on the inner side of the disk 11. The inner-side friction pad 26 is disposed so as to face the inner-side sliding surface 11a of the disk 11.

[0016] The outer side portion 32 is disposed on the other side of the disk 11 in the disk axial direction. The outer side portion 32 is disposed on the outer side of the disk 11. The outer side portion 32 faces the outer side sliding surface 11b of the disk 11. The outer side portion 32 supports the outer side friction pad 27 so as to be movable in the disk axial direction. In other words, the outer side friction pad 27 is movable in the disk axial direction. The outer side friction pad 27 is disposed on the outer side of the disk 11. The outer side friction pad 27 is disposed so as to face the outer side sliding surface 11b of the disk 11.

[0017] The first connecting portion 33 and the second connecting portion 34 extend in the disk axial direction and are provided straddling the outer periphery of the disk 11 in the disk axial direction. The first connecting portion 33 connects the ends of the inner-side arranged portion 31 and the outer-side arranged portion 32 on the radially outer side of the disk and on the rotation-out side in the disk rotation direction. The second connecting portion 34 connects the ends of the inner-side arranged portion 31 and the outer-side arranged portion 32 on the radially outer side of the disk and on the rotation-in side in the disk rotation direction.

[0018] 2, the inner-side portion 31 includes a first fixing portion 42 having a screw hole 41, a second fixing portion 44 having a screw hole 43, and a main beam 45 connecting the first fixing portion 42 and the second fixing portion 44. The inner-side portion 31 also includes a first connecting portion 46 extending from the first fixing portion 42 and a second connecting portion 47 extending from the second fixing portion 44. The first fixing portion 42, the second fixing portion 44, the main beam 45, the first connecting portion 46, and the second connecting portion 47 are all disposed on the inner side of the disc 11, and all face the inner-side sliding surface 11a of the disc 11 shown in FIG.

[0019] As shown in FIG. 2, the first fixing portion 42 is provided on the inner side arrangement portion 31 on the rotation side of the disc rotation direction relative to the second fixing portion 44. The main beam 45 extends in the disc rotation direction. The screw hole 41 is drilled in the first fixing portion 42 along the disc axial direction. The screw hole 43 is drilled in the second fixing portion 44 along the disc axial direction. The mounting member 20 is fixed to the mounting portion by a bolt (not shown) screwed into the screw hole 41, 43 in a state in which the first fixing portion 42 and the second fixing portion 44 are abutted against the mounting portion (not shown) which is a non-rotating portion of the vehicle. The first fixing portion 42 and the second fixing portion 44 fixed to the non-rotating portion of the vehicle are aligned with each other in the disc axial direction and the disc radial direction.

[0020] The first connection portion 46 extends radially outward in the disk direction from the first fixed portion 42. The second connection portion 47 extends radially outward in the disk direction from the second fixed portion 44. The first connection portion 46 is disposed on the rotation side of the second connection portion 47 in the disk rotation direction.

[0021] The first coupling portion 33 extends from an end portion on the radially outer side of the first connecting portion 46 along the disk axial direction toward the outer side, straddling a position radially outer than the outer peripheral surface of the disk 11, as shown in Fig. 1. The second coupling portion 34 extends from an end portion on the radially outer side of the second connecting portion 47 along the disk axial direction toward the outer side, straddling a position radially outer than the outer peripheral surface of the disk 11. The first coupling portion 33 is disposed on the rotation output side of the second coupling portion 34 in the disk rotation direction.

[0022] The outer-side disposed portion 32 includes a third connection portion 51 extending from the first connecting portion 33, a fourth connection portion 52 extending from the second connecting portion 34, and an outer beam 53 connecting the third connection portion 51 and the fourth connection portion 52. The third connection portion 51, the fourth connection portion 52, and the outer beam 53 are all disposed on the outer side of the disc 11, and all face the outer-side sliding surface 11b of the disc 11.

[0023] The third connection portion 51 extends radially inward from the outer end of the first connection portion 33 in the disk axial direction. The fourth connection portion 52 extends radially inward from the outer end of the second connection portion 34 in the disk axial direction. The third connection portion 51 is disposed on the rotation side of the disk rotation direction relative to the fourth connection portion 52. The outer beam 53 connects the inner end of the third connection portion 51 in the disk radial direction to the inner end of the fourth connection portion 52 in the disk radial direction. The outer beam 53 extends in the disk rotation direction.

[0024] The first connection portion 46, the second connection portion 47, the third connection portion 51, and the fourth connection portion 52 shown in Fig. 2 have torque receiving portions 60 of substantially the same shape formed on the inner side in the disk rotation direction, as shown in Fig. 2 for the third connection portion 51 and the fourth connection portion 52 and in Fig. 3 for the first connection portion 46. Thus, the mounting member 20 has four torque receiving portions 60 of substantially the same shape formed therein.

[0025] The torque receiving portion 60 of the first connection portion 46 shown in Fig. 3 and the torque receiving portion (not shown) of the second connection portion 47 shown in Fig. 2 are arranged in mirror symmetry in the disk rotation direction. The torque receiving portion 60 of the third connection portion 51 and the torque receiving portion 60 of the fourth connection portion 52 are arranged in mirror symmetry in the disk rotation direction. In other words, the mounting member 20 has torque receiving portions 60 on both sides in the disk rotation direction.

[0026] The torque receiving portions 60 formed in the mounting member 20 at four locations and having substantially the same shape will be described using the torque receiving portion 60 of the third connection portion 51 on the outer side and on the rotation output side in the disk rotation direction shown in Fig. 4 as an example. The torque receiving portion 60 has, in order from the inside in the radial direction of the disk, a first surface portion 61, a second surface portion 62, a third surface portion 63, a fourth surface portion 64, a fifth surface portion 65, and a sixth surface portion 66. The first surface portion 61, the second surface portion 62, the third surface portion 63, the fourth surface portion 64, the fifth surface portion 65, and the sixth surface portion 66 all extend along the disk axial direction.

[0027] The first surface portion 61 is flat and extends parallel to a radial reference plane. The second surface portion 62 is flat and extends outward in the disk radial direction and in the disk rotation direction from an outer edge portion in the disk radial direction of the first surface portion 61. The second surface portion 62 is inclined with respect to a radial reference plane. The third surface portion 63 is flat and extends outward in the disk rotation direction from the outer edge portion in the disk radial direction of the second surface portion 62. The third surface portion 63 extends perpendicular to a radial reference line.

[0028] The fourth surface 64 is flat and extends outward in the radial direction of the disk from the outer edge in the disk rotation direction of the third surface 63. The fourth surface 64 extends parallel to a radial reference plane. The fifth surface portion 65 is flat and extends inward in the disk rotation direction from the outer edge portion in the disk radial direction of the fourth surface portion 64. The fifth surface portion 65 extends perpendicular to a radial reference line. The sixth surface portion 66 is flat and extends outward in the radial direction of the disk from the inner edge portion in the disk rotation direction of the fifth surface portion 65. The sixth surface portion 66 extends parallel to a radial reference plane.

[0029] The first surface 61, the fourth surface 64, and the sixth surface 66 face inward in the direction of disk rotation. The third surface 63 faces outward in the radial direction of the disk. The fifth surface 65 faces inward in the radial direction of the disk. The continuous second surface 62, third surface 63, fourth surface 64 and fifth surface 65 form an engagement recess 75 that is recessed outward in the disk rotation direction relative to the first surface 61 and sixth surface 66.

[0030] As shown in FIG. 2, the torque receiving portion 60 of the fourth connection portion 52 has an engagement recess 75 that is mirror-symmetrical to the torque receiving portion 60 of the third connection portion 51. The engagement recess 75 of the third connection portion 51 and the engagement recess 75 of the fourth connection portion 52 face each other in the disk rotation direction and are recessed in a direction away from each other in the disk rotation direction. The engagement recess 75 of the third connection portion 51 and the engagement recess 75 of the fourth connection portion 52 are aligned in the disk axial direction and are also aligned in the disk radial direction. The engagement recess 75 of the third connection portion 51 penetrates the third connection portion 51 in the disk axial direction. The engagement recess 75 of the fourth connection portion 52 penetrates the fourth connection portion 52 in the disk axial direction.

[0031] As shown in FIG. 3, the torque receiving portion 60 of the first connection portion 46 has an engagement recess 75. The engagement recess 75 of the first connection portion 46 is oriented in the same direction as the engagement recess 75 of the third connection portion 51 shown in FIG. 2 in the disk rotation direction. The torque receiving portion (not shown) of the second connection portion 47 has an engagement recess (not shown). The engagement recess (not shown) of the second connection portion 47 is oriented in the same direction as the engagement recess 75 of the fourth connection portion 52 in the disk rotation direction. The engagement recess (not shown) of the second connection portion 47 is mirror-symmetrical to the engagement recess 75 of the first connection portion 46 shown in FIG. 3. The engagement recess 75 of the first connection portion 46 and the engagement recess (not shown) of the second connection portion 47 face each other in the disk rotation direction and are recessed in directions away from each other in the disk rotation direction. The engagement recess 75 of the first connection portion 46 and the engagement recess (not shown) of the second connection portion 47 are aligned in the disk axial direction and are also aligned in the disk radial direction. The engagement recess 75 of the first connection portion 46 penetrates the first connection portion 46 in the disk axial direction. The engagement recess (not shown) of the second connection portion 47 penetrates the second connection portion 47 in the disk axial direction.

[0032] The engagement recess 75 of the third connection portion 51 shown in Fig. 2 and the engagement recess 75 of the first connection portion 46 shown in Fig. 3 are positioned in the disk radial direction and are also positioned in the disk rotation direction. The engagement recess 75 of the fourth connection portion 52 shown in Fig. 2 and an engagement recess (not shown) of the second connection portion 47 are positioned in the disk radial direction and are also positioned in the disk rotation direction.

[0033] The mounting member 20 has an inner-side arrangement portion 31 that supports the inner-side friction pad 26 with an engagement recess 75 (shown in FIG. 3) provided in the first connection portion 46 and an engagement recess (not shown) provided in the second connection portion 47 shown in FIG. 1. Also, as shown in FIG. 2, the outer-side arrangement portion 32 of the mounting member 20 supports the outer-side friction pad 27 with an engagement recess 75 provided in the third connection portion 51 and an engagement recess 75 provided in the fourth connection portion 52. The mounting member 20 has a first fixing portion 42, a first connection portion 46, a first coupling portion 33, and a third connection portion 51 that are arranged on the outgoing side of the disk rotation direction. The mounting member 20 has a second fixing portion 44, a second connection portion 47, a second coupling portion 34, and a fourth connection portion 52 that are arranged on the incoming side of the disk rotation direction.

[0034] The first pad spring 24 and the second pad spring 25 are common parts having the same shape. Both the first pad spring 24 and the second pad spring 25 are integrally assembled to the mounting member 20. The first pad spring 24 is attached to the disk rotation direction rotation side of the mounting member 20. At that time, one first pad spring 24 is attached across both the first connection part 46 and the third connection part 51 on the disk rotation direction rotation side. The second pad spring 25 is attached to the disk rotation direction rotation side of the mounting member 20. At that time, one second pad spring 25 is attached across both the second connection part 47 and the fourth connection part 52 on the disk rotation direction rotation side. In other words, two first pad springs 24 and two second pad springs 25 are attached to one mounting member 20. These first pad springs 24 and second pad springs 25 are attached to the mounting member 20 and elastically support the inner side friction pad 26 and the outer side friction pad 27 shown in FIG. 1. The first pad spring 24 and the second pad spring 25 guide the movement of the inner friction pad 26 and the outer friction pad 27 in the disk axial direction.

[0035] 5 and 6 show the first pad spring 24 and the second pad spring 25 in their natural state before being assembled to the mounting member 20. Since the first pad spring 24 and the second pad spring 25 have the same shape, the first pad spring 24 will be taken as an example for explanation. Here, the first pad spring 24 in its natural state will be explained.

[0036] The first pad spring 24 has a mirror symmetrical shape. The entire first pad spring 24 is formed by press molding from a single metal plate material of a constant thickness. The first pad spring 24 has a pair of pad support parts 101, a connecting part 102 connecting the pad support parts 101, and an engagement part 103 extending from the connecting part 102. As shown in FIG. 3, the pair of pad support parts 101 of the first pad spring 24 are disposed on both sides of the disk 11 in the disk axial direction. The connecting part 102 of the first pad spring 24 is disposed outside the disk 11 in the disk radial direction. In other words, the disk 11 is disposed between the pair of pad support parts 101 of the first pad spring 24.

[0037] 5 and 6, in the first pad spring 24, the pair of pad support parts 101 have mirror symmetrical shapes. Therefore, one of the pad support parts 101 will be described.

[0038] The pad support portion 101 has a base portion 111 , an extension portion 112 , and a return spring portion 113 .

[0039] 5, the base 111 has an outer plate portion 121, an outer support plate portion 122, a wall plate portion 123, an inner extending plate portion 124, an inner inclined plate portion 125, an inner end plate portion 126, and an engaging claw 127. The outer plate portion 121, the outer support plate portion 122, the wall plate portion 123, the inner extending plate portion 124, the inner inclined plate portion 125, the inner end plate portion 126, and the engaging claw 127 are all flat plate-shaped.

[0040] The outer plate portion 121 is located at the end of the pad support portion 101 on the connecting portion 102 side. The outer plate portion 121 extends from the connecting portion 102. The outer support plate portion 122 extends perpendicularly to the outer plate portion 121 from the edge portion of the outer plate portion 121 opposite the connecting portion 102 .

[0041] The wall plate portion 123 extends perpendicularly to the outer support plate portion 122 from an edge portion of the outer support plate portion 122 opposite the outer plate portion 121. The wall plate portion 123 extends from the outer support plate portion 122 to the opposite side to the outer plate portion 121 in the thickness direction of the outer support plate portion 122. The wall plate portion 123 extends parallel to the outer plate portion 121.

[0042] The inner extending plate portion 124 extends from an edge portion of the wall plate portion 123 opposite to the outer support plate portion 122 to the same side as the outer support plate portion 122 in the thickness direction of the wall plate portion 123. The inner extending plate portion 124 is inclined with respect to the outer support plate portion 122 so that the further away from the wall plate portion 123 in the thickness direction of the wall plate portion 123 the inner extending plate portion 124 is, the closer to the outer support plate portion 122 it is.

[0043] The inner inclined plate portion 125 extends from the edge portion of the inner extending plate portion 124 opposite the wall plate portion 123, in a direction away from the outer support plate portion 122 in the thickness direction of the outer support plate portion 122, and in a direction away from the wall plate portion 123 in the thickness direction of the wall plate portion 123. The inner inclined plate portion 125 and the inner extending plate portion 124 form an obtuse angle.

[0044] An intermediate opening 129 is formed in the wall plate portion 123, the inner extending plate portion 124, and the inner inclined plate portion 125. The intermediate opening 129 extends from a portion of the wall plate portion 123 on the inner extending plate portion 124 side, across the inner extending plate portion 124, to a portion of the inner inclined plate portion 125 on the inner extending plate portion 124 side.

[0045] The inner end plate portion 126 extends from the edge portion of the inner inclined plate portion 125 opposite the inner extending plate portion 124 in a direction away from the outer support plate portion 122 in the thickness direction of the outer support plate portion 122 and toward the wall plate portion 123 in the thickness direction of the wall plate portion 123. The inner end plate portion 126 and the inner inclined plate portion 125 form an obtuse angle.

[0046] The engagement claw 127 protrudes from an edge portion that forms an intermediate opening 129 of the wall plate portion 123. The engagement claw 127 protrudes from the wall plate portion 123 in a direction away from the outer support plate portion 122 in the thickness direction of the outer support plate portion 122 and toward the inner inclined plate portion 125 in the thickness direction of the wall plate portion 123. The engagement claw 127 and the wall plate portion 123 form an obtuse angle. The engagement claw 127 protrudes beyond the inner extending plate portion 124 to the opposite side to the outer support plate portion 122 in the thickness direction of the outer support plate portion 122.

[0047] The continuous outer support plate 122, wall plate 123, and inner extending plate 124 as a whole constitute a guide portion 130 that is concave on one surface in the thickness direction of the outer plate 121 and the inner plate 115 and convex on the other surface. The guide portion 130 is provided on the base 111.

[0048] The extension portion 112 has an outer extension plate portion 141 and a tip plate portion 142 .

[0049] The outer extending plate portion 141 extends from an edge portion of the outer plate portion 121 of the one pad support portion 101 on which the outer extending plate portion 141 is provided, on the opposite side to the other pad support portion 101, on the same side as the outer support plate portion 122 in the thickness direction of the outer plate portion 121. The outer extending plate portion 141 is perpendicular to the outer plate portion 121.

[0050] The tip plate portion 142 extends perpendicularly to the outer extending plate portion 141 from the edge portion of the outer extending plate portion 141 opposite the outer plate portion 121. The tip plate portion 142 extends from the outer extending plate portion 141 of the one pad support portion 101 to which the tip plate portion 142 is provided, in the opposite direction to the other pad support portion 101. The tip plate portion 142 extends parallel to the outer plate portion 121.

[0051] The return spring portion 113 has a curved plate portion 151 , a base end side plate portion 152 , an inclined extending plate portion 153 , a tip end side plate portion 154 , a contact plate portion 155 , and a wear detection portion 156 .

[0052] The curved plate portion 151 protrudes from an edge portion of the outer support plate portion 122 of the one pad support portion 101 on the other pad support portion 101 side, on the same side as the wall plate portion 123, in the thickness direction of the outer support plate portion 122. The curved plate portion 151 is curved about a central axis perpendicular to the wall plate portion 123 and disposed on the inner extending plate portion 124 side and the extending portion 112 side with respect to the curved plate portion 151.

[0053] The base end side plate portion 152 is flat. The base end side plate portion 152 protrudes from the edge portion of the curved plate portion 151 opposite to the outer support plate portion 122 in the thickness direction of the outer support plate portion 122 in the opposite direction to the outer support plate portion 122. The base end side plate portion 152 extends perpendicular to the outer support plate portion 122 and perpendicular to the wall plate portion 123.

[0054] The inclined extending plate portion 153 is flat. The inclined extending plate portion 153 extends from the edge of the base end side plate portion 152 opposite to the curved plate portion 151 in a direction away from the outer support plate portion 122 in the thickness direction of the outer support plate portion 122. The inclined extending plate portion 153 is inclined with respect to the base end side plate portion 152 so that the more it extends from the base end side plate portion 152 of the one pad support portion 101 to which the inclined extending plate portion 153 is provided, the more it moves away from the other pad support portion 101. The inclined extending plate portion 153 extends perpendicularly to the wall plate portion 123.

[0055] The tip side plate portion 154 is flat. The tip side plate portion 154 extends from an edge portion of the inclined extending plate portion 153 opposite to the base end side plate portion 152 in a direction away from the outer support plate portion 122 in the thickness direction of the outer support plate portion 122. The inclined extending plate portion 153 extends perpendicular to the outer support plate portion 122 and perpendicular to the wall plate portion 123. The tip side plate portion 154 extends further to the opposite side of the wall plate portion 123 than the inclined extending plate portion 153 in the thickness direction of the wall plate portion 123.

[0056] The contact plate portion 155 has a main body portion 161 and a protrusion portion 162 . The main body 161 is flat. The main body 161 extends from an extension portion of an end edge connected to the inclined extending plate portion 153 of the tip side plate portion 154, which is located on the opposite side of the wall plate portion 123 from the inclined extending plate portion 153 in the thickness direction of the wall plate portion 123. Therefore, the abutting plate portion 155 is disposed on the opposite side of the wall plate portion 123 from the inclined extending plate portion 153 in the thickness direction of the wall plate portion 123. The main body 161 extends from the tip side plate portion 154 in a direction approaching the outer support plate portion 122 in the thickness direction of the outer support plate portion 122. The main body 161 is inclined with respect to the tip side plate portion 154 so that the more it extends from the tip side plate portion 154 of one pad support portion 101 to which the main body 161 is provided, the more it moves away from the other pad support portion 101. The main body 161 spreads perpendicularly to the wall plate portion 123.

[0057] The protrusion 162 is formed on a portion of the main body 161 opposite the tip side plate 154. The protrusion 162 protrudes in a direction opposite to the other pad support part 101 from the side of the main body 161 of the one pad support part 101 on which the protrusion 162 is provided opposite the other pad support part 101. The protrusion 162 is recessed in a direction opposite to the other pad support part 101 from the other pad support part 101 side of the main body 161 of the one pad support part 101 on which the protrusion 162 is provided.

[0058] The wear detection portion 156 is flat. The wear detection portion 156 protrudes from the edge of the tip side plate portion 154 opposite to the wall plate portion 123 in the thickness direction of the wall plate portion 123. The wear detection portion 156 protrudes from the tip side plate portion 154 of one pad support portion 101 on which the wear detection portion 156 is provided, toward the other pad support portion 101. The wear detection portion 156 extends parallel to the wall plate portion 123. The end surface of the wear detection portion 156 opposite to the tip side plate portion 154 in the thickness direction of the tip side plate portion 154 is a flat plane portion 158. The plane portion 158 extends perpendicular to the wall plate portion 123 and perpendicular to the outer support plate portion 122.

[0059] As described above, the return spring portion 113 extends from the curved plate portion 151 connected to the base portion 111 .

[0060] The first pad spring 24 has a pair of pad support parts 101 having the above-mentioned structure arranged in a mirror symmetrical manner.

[0061] The connecting portion 102 has a base end connecting plate portion 171, an intermediate connecting plate portion 172, and a tip connecting plate portion 173. The base end connecting plate portion 171, the intermediate connecting plate portion 172, and the tip connecting plate portion 173 are all flat plate-shaped.

[0062] The base end connecting plate portion 171 is disposed on the same plane as each of the outer plate portions 121 of the pair of pad support portions 101, and connects these outer plate portions 121. The base end connecting plate portion 171 connects the end edges of the pair of outer plate portions 121 opposite to the pair of outer support plate portions 122.

[0063] The intermediate connecting plate portion 172 extends from an edge portion of the base end connecting plate portion 171 opposite the pair of outer plate portions 121 in a direction away from the outer support plate portion 122 in the thickness direction of the outer support plate portion 122. The intermediate connecting plate portion 172 extends from the base end connecting plate portion 171 to the same side as the pair of outer support plate portions 122 in the thickness direction of the base end connecting plate portion 171.

[0064] The tip connecting plate portion 173 extends from the edge of the intermediate connecting plate portion 172 opposite the base end connecting plate portion 171 to the opposite side to the base end connecting plate portion 171. The tip connecting plate portion 173 extends in parallel to the base end connecting plate portion 171.

[0065] As shown in FIG. 6, the engaging portion 103 has a base portion 175 and a pair of engaging protrusions 176.

[0066] The base plate portion 175 is flat. The base plate portion 175 extends from a position between the pair of outer plates 121 at the edge of the base end connecting plate portion 171 opposite to the intermediate connecting plate portion 172, on the same side as the intermediate connecting plate portion 172 in the thickness direction of the base end connecting plate portion 171. The base plate portion 175 extends so as to approach the outer support plate portion 122 in the thickness direction of the outer support plate portion 122 as it moves away from the base end connecting plate portion 171 in the thickness direction of the base end connecting plate portion 171.

[0067] The pair of engaging protrusions 176 are provided on the end of the base plate portion 175 opposite the base end connecting plate portion 171. Of the pair of engaging protrusions 176, one engaging protrusion 176 protrudes from an end of the base plate portion 175 on one outer plate portion 121 side, and the other engaging protrusion 176 protrudes from an end of the base plate portion 175 on the other outer plate portion 121 side. The pair of engaging protrusions 176 protrude on the side opposite the base end connecting plate portion 171 in the thickness direction of the base plate portion 175. The distance between the pair of engaging protrusions 176 becomes wider as they move away from the base plate portion 175.

[0068] As shown in FIG. 3, the first pad spring 24 is attached to the first connection portion 46 and the third connection portion 51, both of which are on the rotation side of the mounting member 20 in the disc rotation direction. At this time, the first pad spring 24 is in a state in which the connecting portion 102 is disposed on the outer side in the disc radial direction than the pair of pad support portions 101. At this time, the first pad spring 24 fits the guide portion 130 of one of the pair of pad support portions 101 into the engagement recess 75 of the third connection portion 51 shown in FIG. 4, and fits the guide portion 130 of the other pad support portion 101 shown in FIG. 3 into the engagement recess 75 of the first connection portion 46. As a result, the first pad spring 24 is provided on the mounting member 20 such that movement in the disc radial direction and toward the rotation side in the disc rotation direction is restricted. At that time, as shown in FIG. 3, the first pad spring 24 abuts one of the engagement protrusions 176 of the engagement portion 103 against the surface of the third connection portion 51 on the first connection portion 46 side, and the other engagement protrusion 176 against the surface of the first connection portion 46 on the third connection portion 51 side. As a result, the first pad spring 24 is provided on the mounting member 20 such that movement in the disk axial direction is restricted. In other words, the first pad spring 24 is positioned relative to the mounting member 20 in the disk radial direction, the disk rotation direction, and the disk axial direction and is integrally attached. In the first pad spring 24, the outer extension plate portion 141 of one of the pair of extension portions 112 is disposed on the opposite side to the first connection portion 46 of the third connection portion 51, and the outer extension plate portion 141 of the other extension portion 112 is disposed on the opposite side to the third connection portion 51 of the first connection portion 46.

[0069] In the state where the first pad spring 24 is attached to the mounting member 20, the pair of pad support parts 101 are arranged on both sides of the disk 11 in the disk axial direction. In addition, in this state, the guide part 130 of one of the pad support parts 101 of the first pad spring 24 is arranged in the engagement recess 75 of the first connection part 46 of the mounting member 20, and the guide part 130 of the other pad support part 101 is arranged in the engagement recess 75 of the third connection part 51 of the mounting member 20. In other words, in the state where the first pad spring 24 is attached to the mounting member 20, the outer pad support part 101 is engaged with the torque receiving part 60 of the third connection part 51, and the inner pad support part 101 is engaged with the torque receiving part 60 of the first connection part 46. In addition, in this state, the pair of guide parts 130 of the first pad spring 24 that fit into the pair of engagement recesses 75 are recessed toward the outward side of the disk rotation direction, i.e., toward the rotation side of the disk rotation direction.

[0070] In the first pad spring 24, the engagement state between the outer pad support portion 101 and the torque receiving portion 60 of the third connecting portion 51 is similar to the engagement state between the inner pad support portion 101 and the torque receiving portion 60 of the first connecting portion 46. For this reason, here, the engagement state between the outer pad support portion 101 of the first pad spring 24 and the torque receiving portion 60 of the third connecting portion 51 will be described mainly with reference to FIG.

[0071] In the pad support portion 101 on the outer side of the first pad spring 24, the wall plate portion 123 constituting the guide portion 130 is disposed on the outer side of the guide portion 130 in the disk rotation direction. At that time, this wall plate portion 123 faces the fourth surface portion 64 on the inner side in the recess direction of the engagement recess 75, and is in surface contact with this fourth surface portion 64. In this state, the wall plate portion 123, like the fourth surface portion 64, extends parallel to the radial reference plane.

[0072] Additionally, the pad support portion 101 on the outer side of the first pad spring 24 has an outer support plate portion 122 constituting a guide portion 130, which is disposed on the radially outer side of the guide portion 130 in the disk radial direction. At this time, the outer support plate portion 122 faces the fifth surface portion 65 on the radially outer side of the engagement recess 75, and comes into surface contact with the fifth surface portion 65. At this time, the outer support plate portion 122, like the fifth surface portion 65, extends along the disk axis and perpendicular to the radial reference line.

[0073] Additionally, the pad support portion 101 on the outer side of the first pad spring 24 has an inner extending plate portion 124 constituting a guide portion 130, which is disposed on the inner side in the disk radial direction of the guide portion 130. At this time, the inner extending plate portion 124 faces the third surface portion 63 on the inner side in the disk radial direction of the engagement recess 75. In this state, the inner extending plate portion 124 expands along the disk axial direction.

[0074] Additionally, the pad support portion 101 on the outer side of the first pad spring 24 has an engagement claw 127 that protrudes radially inward from the inner extending plate portion 124. In this state, the engagement claw 127 abuts against the third surface portion 63 of the engagement recess 75 and elastically deforms radially outward. The engagement claw 127 presses the outer support plate portion 122 against the fifth surface portion 65, and prevents the wall plate portion 123 from moving away from the fourth surface portion 64, i.e., prevents the guide portion 130 from coming out of the engagement recess 75.

[0075] Additionally, the pad support portion 101 on the outer side of the first pad spring 24 has an inner inclined plate portion 125 that extends radially inward in the disk direction and inward in the disk rotation direction from the inner extending plate portion 124. This inner inclined plate portion 125 faces the first surface portion 61 in the disk rotation direction.

[0076] Additionally, the pad support portion 101 on the outer side of the first pad spring 24 has an inner end plate portion 126 that extends radially inward in the disc direction and outward in the disc rotation direction from the inner inclined plate portion 125. This inner end plate portion 126 also faces the first surface portion 61 in the disc rotation direction.

[0077] Additionally, the pad support portion 101 on the outer side of the first pad spring 24 has an outer plate portion 121 that extends outward in the disc radial direction from an outer support plate portion 122. The outer plate portion 121 faces the sixth surface portion 66 in the disc rotation direction.

[0078] As described above, the guide portion 130 of the pad support portion 101 on the outer side of the first pad spring 24 fits into the engagement recess 75 of the third connection portion 51. At that time, the pad support portion 101 abuts against the engagement recess 75 at the outer support plate portion 122, the wall plate portion 123 and the engagement claw 127.

[0079] The pad support portion 101 on the outer side of the first pad spring 24 has an outer support plate portion 122 that extends inward in the disc rotation direction from the outer edge of the wall plate portion 123 in the disc radial direction. The pad support portion 101 on the outer side of the first pad spring 24 has an inner extension plate portion 124 that extends inward in the disc rotation direction from the inner edge of the wall plate portion 123 in the disc radial direction. The outer support plate portion 122, the wall plate portion 123 and the inner extension plate portion 124 all extend along the disc axial direction.

[0080] When the first pad spring 24 is attached to the mounting member 20, the inner pad support portion 101 shown in Figure 3 engages with the torque receiving portion 60 of the first connection portion 46 in the same manner as the outer pad support portion 101 engages with the torque receiving portion 60 of the third connection portion 51. When the first pad spring 24 is attached to the attachment member 20, the connecting portions 102 extend outward in the radial direction of the disk from the pair of pad support portions 101.

[0081] As shown in FIG. 1, the second pad spring 25 is attached to the second connection portion 47 and the fourth connection portion 52, both of which are on the rotation-in side of the mounting member 20 in the disc rotation direction, in substantially the same manner as the first pad spring 24 is attached to the first connection portion 46 and the third connection portion 51.

[0082] 2, the second pad spring 25 in the attached state attached to the mounting member 20 has the outer pad support portion 101 engaged with the torque receiving portion 60 of the fourth connecting portion 52. Also, in this attached state, the inner pad support portion 101 shown in FIG. 1 engages with the torque receiving portion (not shown) of the second connecting portion 47.

[0083] In this way, the first pad spring 24 and the second pad spring 25 are attached to the mounting member 20 facing each other in the disc rotation direction while being spaced apart in the disc rotation direction. As shown in Fig. 6, the first pad spring 24 and the second pad spring 25 are in a state where the return spring portion 113 is disposed on the disc 11 side of the base portion 111 in the disc axial direction.

[0084] In this state, the return spring portion 113 is in a state where the curved plate portion 151 protrudes from the outer support plate portion 122 toward the disk 11 side in the disk axial direction and inward in the disk radial direction. Also, in this state, the return spring portion 113 is in a state where the base end side plate portion 152 protrudes from the curved plate portion 151 inward in the disk radial direction. Also, in this state, the return spring portion 113 is in a state where the inclined extension plate portion 153 extends from the base end side plate portion 152 inward in the disk radial direction and on the opposite side to the disk 11 in the disk axial direction. Also, in this state, the return spring portion 113 is in a state where the tip side plate portion 154 extends from the inclined extension plate portion 153 inward in the disk radial direction. Also, in this state, the return spring portion 113 is in a state where the abutment plate portion 155 extends from the tip side plate portion 154 outward in the disk radial direction and on the opposite side to the disk 11 in the disk axial direction. In this state, the wear detection portion 156 of the return spring portion 113 protrudes from the tip side plate portion 154 toward the disk 11 in the disk axial direction. In this state, the flat portion 158 of the wear detection portion 156 of the return spring portion 113 is aligned with the inner sliding surface 11a and the outer sliding surface 11b of the disk 11.

[0085] As shown in FIG. 3, the first pad spring 24 and the second pad spring 25 are attached to the attachment member 20 at the inner side base portion 111 and the outer side base portion 111, respectively.

[0086] In this state, as shown in Fig. 6 for the first pad spring 24, the first pad spring 24 and the second pad spring 25 each have an inner-side return spring portion 113 extending from a curved plate portion 151 connected to the inner-side base portion 111. Also, in this state, the first pad spring 24 and the second pad spring 25 each have an outer-side return spring portion 113 extending from a curved plate portion 151 connected to the outer-side base portion 111. Also, in this state, the first pad spring 24 and the second pad spring 25 each have a wear detection portion 156 at a portion of the inner-side return spring portion 113 facing the inner-side sliding surface 11a of the disc 11 separated from the curved plate portion 151. In this state, the first pad spring 24 and the second pad spring 25 each have a wear detection portion 156 at a location where the outer side return spring portion 113 faces the outer side sliding surface 11b of the disc 11, which is spaced from the curved plate portion 151. In this state, the first pad spring 24 and the second pad spring 25 each have a wear detection portion 156 of the inner side return spring portion 113 formed with a flat portion 158 that can fit along the inner side sliding surface 11a of the disc 11. In this state, the first pad spring 24 and the second pad spring 25 each have a wear detection portion 156 of the outer side return spring portion 113 formed with a flat portion 158 that can fit along the outer side sliding surface 11b of the disc 11.

[0087] As shown in Fig. 2, the inner friction pad 26 and the outer friction pad 27 are engaged with the first pad spring 24 and the second pad spring 25 attached to the mounting member 20, as shown in Fig. 2 for the outer friction pad 27. The outer friction pad 27 is supported by the third connecting portion 51 and the fourth connecting portion 52 of the mounting member 20 via the first pad spring 24 and the second pad spring 25. The inner friction pad 26 shown in Fig. 1 is supported by the first connecting portion 46 and the second connecting portion 47 of the mounting member 20 shown in Fig. 2 via the first pad spring 24 and the second pad spring 25. The inner friction pad 26 and the outer friction pad 27 shown in Fig. 1 have their longitudinal directions aligned with the disk rotation direction.

[0088] The inner friction pad 26 on the inner side and the outer friction pad 27 on the outer side are components having substantially the same shape.

[0089] The inner friction pad 26 and the outer friction pad 27 each have a back plate 181 that is a common part of the same shape. The inner friction pad 26 and the outer friction pad 27 each have a lining 182 of the same shape. The lining 182 is attached to one surface side of the back plate 181 in the thickness direction. The inner friction pad 26 and the outer friction pad 27 are both longitudinally aligned with the longitudinal direction of the back plate 181. The inner friction pad 26 has the back plate 181 supported by the mounting member 20 via the first pad spring 24 and the second pad spring 25 with the lining 182 facing the disk 11. The outer friction pad 27 has the back plate 181 supported by the mounting member 20 via the first pad spring 24 and the second pad spring 25 with the lining 182 facing the disk 11.

[0090] Since the back plate 181 of the inner friction pad 26 and the back plate 181 of the outer friction pad 27 have the same shape, the back plate 181 of the outer friction pad 27 will be described as an example mainly with reference to FIG.

[0091] The back plate 181 has a mirror symmetric shape. The back plate 181 has a main body portion 191 and a pair of ear portions 192.

[0092] The main body part 191 is provided at the center in the longitudinal direction of the back plate 181. The main body part 191 has a shape that is long in the longitudinal direction of the back plate 181. The lining 182 shown in FIG. 1 is attached to the main body part 191. The lining 182 also has a shape that is mirror-symmetric in the longitudinal direction of the back plate 181. As shown in FIG. 2, the main body part 191 has a pair of end faces 194 at both ends in the longitudinal direction. The pair of end faces 194 are parallel to each other and face in opposite directions. The end faces 194 extend in the thickness direction of the back plate 181.

[0093] The back plate 181 also has a pair of ears 192 that are mirror-symmetric in shape. One ear 192 is provided at one end of the back plate 181 in the longitudinal direction. The other ear 192 is provided at the other end of the back plate 181 in the longitudinal direction. One of the pair of ears 192 protrudes outward from an end face 194 at one end of the main body part 191 in the longitudinal direction along the longitudinal direction of the main body part 191. The other of the pair of ears 192 protrudes outward from an end face 194 at the other end of the main body part 191 in the longitudinal direction along the longitudinal direction of the main body part 191. Thus, the pair of ears 192 protrude in opposite directions from both ends of the main body part 191 in the longitudinal direction along the longitudinal direction of the main body part 191.

[0094] The back plate 181 is supported by the mounting member 20 with its longitudinal direction aligned with the disc rotation direction and a pair of ears 192 arranged on both ends in the disc rotation direction. At that time, the back plate 181 is supported by the mounting member 20 via the first pad spring 24 at the ear 192 on the rotation-out side in the disc rotation direction, and the second pad spring 25 at the ear 192 on the rotation-in side in the disc rotation direction.

[0095] The back plate 181 of the inner friction pad 26 and the back plate 181 of the outer friction pad 27 have the same shape, and the pair of ears 192 of each are mirror images. Therefore, referring mainly to FIG. 4, the ear 192 on the rotation side of the back plate 181 of the outer friction pad 27 in the disc rotation direction will be described as an example.

[0096] Ear portion 192 on the rotation side of back plate 181 in the disc rotation direction has an inner side surface portion 201, an outer side surface portion 202, and a tip surface portion 203. Inner side surface portion 201, outer side surface portion 202, and tip surface portion 203 are all flat and extend along the thickness direction of back plate 181.

[0097] The inner side surface portion 201 is disposed radially inward of the outer side surface portion 202. The inner side surface portion 201 and the outer side surface portion 202 both extend from the end surface 194 of the main body portion 191 along the longitudinal direction of the back plate 181. The inner side surface portion 201 and the outer side surface portion 202 are parallel to each other and face in opposite directions.

[0098] The tip surface portion 203 is located at the end of the ear portion 192 opposite the main body portion 191 in the longitudinal direction of the back plate 181. The tip surface portion 203 extends perpendicular to the inner side surface portion 201 and the outer side surface portion 202. The tip surface portion 203 extends parallel to the end surface 194 of the main body portion 191.

[0099] As shown in Fig. 1, the outer friction pad 27 is oriented such that the lining 182 is disposed on the disk 11 side with respect to the back plate 181 in the disk axial direction, and as shown in Fig. 2, the ear 192 on the disk rotation direction rotation side is engaged with the base 111 of the outer pad support portion 101 attached to the third connection portion 51 of the first pad spring 24. Also, the outer friction pad 27 is engaged with the ear 192 on the disk rotation direction rotation side with the base 111 of the outer pad support portion 101 attached to the fourth connection portion 52 of the second pad spring 25. In this manner, the outer friction pad 27 is attached to the attachment member 20 via the first pad spring 24 and the second pad spring 25.

[0100] At this time, the ear 192 on the rotation side in the disc rotation direction of the outer friction pad 27 is inserted into the guide portion 130 of the outer base 111 of the first pad spring 24, as shown in Fig. 4. Moreover, the ear 192 on the rotation side in the disc rotation direction of the outer friction pad 27 is inserted into a portion on the opposite side of the disc 11 in the disc axial direction from the return spring portion 113 in the guide portion 130 of the outer base 111 of the first pad spring 24, as shown in Fig. 6.

[0101] Then, as shown in Fig. 4, the inner part in the disk radial direction of the end surface 194 on the disk rotation direction rotation side of the main body 191 of the outer side friction pad 27 abuts against the boundary part between the inner inclined plate part 125 and the inner end plate part 126 of the outer side base part 111 of the first pad spring 24, and presses this boundary part toward the disk rotation direction rotation side. As a result, the boundary part between the inner extension plate part 124 and the inner inclined plate part 125 of the outer side base part 111 of the first pad spring 24 is pushed up outward in the disk radial direction and abuts against the inner side surface part 201 of the ear part 192 on the disk rotation direction rotation side of the outer side friction pad 27, and presses this ear part 192 outward in the disk radial direction. As a result, the outer side surface part 202 of this ear part 192 is pressed against the outer support plate part 122 of the outer side base part 111 of the first pad spring 24, and makes surface contact. Therefore, the ear portion 192 on the rotation side of the outer friction pad 27 in the disc rotation direction is attached to the outer base portion 111 of the first pad spring 24 and is elastically supported in the disc radial direction.

[0102] In this state, the tip surface portion 203 of the ear portion 192 on the rotation side in the disc rotation direction of the outer friction pad 27 faces the wall plate portion 123 of the outer side base portion 111 of the first pad spring 24. Also, in this state, the ear portion 192 on the rotation side in the disc rotation direction of the outer friction pad 27 becomes movable in the disc axial direction relative to the outer side base portion 111 of the first pad spring 24 and the third connection portion 51 of the mounting member 20.

[0103] 2, when the outer friction pad 27 is attached to the attachment member 20 via the first pad spring 24 and the second pad spring 25, the ear 192 on the disk rotation direction turn-in side of the outer friction pad 27 is attached to the outer side base 111 of the second pad spring 25. At that time, the ear 192 on the disk rotation direction turn-in side of the outer friction pad 27 is attached to the outer side base 111 of the second pad spring 25 in the same manner as the above-mentioned attachment of the ear 192 on the disk rotation direction turn-out side to the outer side base 111 of the first pad spring 24, and is elastically supported in the disk radial direction.

[0104] In this state, the ear portion 192 on the rotation side of the outer friction pad 27 in the disc rotation direction is movable in the disc axial direction relative to the outer base portion 111 of the second pad spring 25 and the fourth connection portion 52 of the mounting member 20 .

[0105] In the same manner as the above-described attachment of the outer-side friction pad 27 to the third connecting portion 51 and the fourth connecting portion 52 of the attachment member 20 via the outer-side base portion 111 of the first pad spring 24 and the outer-side base portion 111 of the second pad spring 25, the inner-side friction pad 26 is attached to the first connecting portion 46 and the second connecting portion 47 of the attachment member 20 via the inner-side base portion 111 of the first pad spring 24 and the inner-side base portion 111 of the second pad spring 25. Then, the ear portion 192 on the rotation side in the disc rotation direction of the inner-side friction pad 26 is elastically supported by the inner-side base portion 111 of the first pad spring 24 so as to be movable in the disc axial direction.

[0106] In this state, the ear 192 on the rotation side of the inner friction pad 26 in the disc rotation direction is movable in the disc axial direction relative to the inner base 111 of the first pad spring 24 and the first connecting portion 46 of the mounting member 20. Also, the ear (not shown) on the rotation side of the inner friction pad 26 in the disc rotation direction is elastically supported by the inner base 111 of the second pad spring 25 so as to be movable in the disc axial direction.

[0107] In this state, the ear portion (not shown) on the rotation side of the inner friction pad 26 in the disc rotation direction becomes movable in the disc axial direction relative to the inner base portion 111 of the second pad spring 25 and the second connection portion 47 of the mounting member 20 .

[0108] The inner friction pad 26 and the outer friction pad 27, when attached to the mounting member 20 via the first pad spring 24 and the second pad spring 25, have the return spring portion 113 positioned on the disk 11 side in the disk axial direction of the ear portion 192, as shown in Figure 3 as the rotation output side in the disk rotation direction.

[0109] As shown in FIG. 2, an outer return spring 211 is attached to the ear 192 on the outer side of the outer friction pad 27 on the rotation side in the disk rotation direction. The outer return spring 211 abuts against the outer extension plate 141 of the outer extension portion 112 of the second pad spring 25 on the rotation side in the disk rotation direction from the side opposite to the disk 11 in the disk axial direction. This outer return spring 211 biases the disk rotation direction rotation side of the outer friction pad 27 that has moved toward the disk 11 in the disk axial direction in a direction away from the disk 11. A similar return spring (not shown) is attached to the ear (not shown) on the rotation side in the disk rotation direction of the inner friction pad 26 on the inner side. This return spring abuts against the outer extension plate 141 of the inner extension portion 112 of the second pad spring 25 on the rotation side in the disk rotation direction from the side opposite to the disk 11 in the disk axial direction. This return spring biases the inlet side of the inner friction pad 26 in the disk rotation direction, which has moved toward the disk 11 in the disk axial direction, in a direction away from the disk 11.

[0110] 1, the caliper 21 includes a caliper body 221, a first slide pin 222, a second slide pin 223, a mounting bolt 225, and a piston 226. In addition, the caliper 21 includes a mounting bolt 227 as shown in FIG.

[0111] As shown in Fig. 1, the caliper 21 has a shape that is approximately mirror symmetrical, and a radial reference line and a radial reference plane pass through a center position in the disk rotation direction of the caliper 21. As shown in Fig. 3, the caliper 21 has a first slide pin 222 fixed to a caliper body 221 by a mounting bolt 227. Also, as shown in Fig. 1, the caliper 21 has a second slide pin 223 fixed to the caliper body 221 by a mounting bolt 225. The pair of first slide pin 222 and second slide pin 223 are aligned with each other in the axial direction and arranged parallel to each other.

[0112] The mounting member 20 is formed with a first pin insertion hole (not shown) extending along the disk axial direction from the inner end face of the first connecting portion 33 to a midway position within the first connecting portion 33. The mounting member 20 is also formed with a second pin insertion hole (not shown) extending along the disk axial direction from the inner end face of the second connecting portion 34 to a midway position within the second connecting portion 34. The caliper 21 has a first slide pin 222 slidably fitted into the first pin insertion hole (not shown) of the mounting member 20. The caliper 21 has a second slide pin 223 slidably fitted into the second pin insertion hole (not shown) of the mounting member 20.

[0113] As a result, the caliper 21 is supported by the mounting member 20 via the first slide pin 222 and the second slide pin 223 so that the caliper body 221 can slide along the disk axial direction. In other words, the mounting member 20 supports the caliper 21 at the pair of first connecting portions 33 and second connecting portions 34 so that the caliper 21 can slide in the disk axial direction. Thus, the caliper 21 is supported by the mounting member 20 so as to be movable in the disk axial direction. The first pin boot 22 covers a portion of the first slide pin 222 that protrudes from the mounting member 20. The second pin boot 23 covers a portion of the second slide pin 223 that protrudes from the mounting member 20.

[0114] The caliper body 221 has a shape that is approximately mirror symmetric. The radial reference line and the radial reference plane pass through the center position in the disk rotation direction of the caliper body 221. The caliper body 221 includes a cylinder portion 231, a bridge portion 232, a claw portion 233, a first pin arrangement portion 234, and a second pin arrangement portion 235.

[0115] The cylinder portion 231 is disposed on the inner side of the disk 11 in the disk axial direction. The bridge portion 232 extends from a portion of the cylinder portion 231 on the outer side in the disk radial direction to the outer side along the disk axial direction so as to straddle the outer circumference of the disk 11. The claw portion 233 extends from a portion of the bridge portion 232 on the opposite side of the cylinder portion 231 in the disk axial direction to the inner side in the disk radial direction. The claw portion 233 is disposed on the outer side of the disk 11. The first pin arrangement portion 234 is disposed on the outgoing side of the disk rotation direction from the cylinder portion 231. The second pin arrangement portion 235 is disposed on the incoming side of the disk rotation direction from the cylinder portion 231. The first slide pin 222 of the caliper body 221 is fixed to the first pin arrangement portion 234 by a mounting bolt 227 shown in FIG. 3. In the caliper body 221, the second slide pin 223 is fixed to the second pin mounting portion 235 shown in FIG.

[0116] A cylinder hole 241 is formed in the cylinder portion 231. The cylinder hole 241 is recessed in the opposite direction to the disk 11 from the end face of the cylinder portion 231 on the disk 11 side in the disk axial direction. Therefore, the cylinder hole 241 opens to the disk 11 side. The cylinder hole 241 is aligned along the disk axial direction. One cylinder hole 241 is formed in the cylinder portion 231. The piston 226 is housed in this cylinder hole 241. Therefore, the caliper 21 is a single-pot type caliper. The claw portion 233 is provided facing the cylinder hole 241 in the disk axial direction.

[0117] The piston 226 is housed in a cylinder hole 241 of the cylinder portion 231 so as to be movable in the disk axial direction. The piston 226 faces the inner sliding surface 11a of the disk 11. An inner friction pad 26 is disposed between the inner sliding surface 11a of the disk 11 and the piston 226. An outer friction pad 27 is disposed between the outer sliding surface 11 b of the disk 11 and the claw portion 233 .

[0118] When braking while the vehicle is traveling forward, brake fluid is introduced into the disc brake 10 between the cylinder hole 241 of the cylinder portion 231 of the caliper 21 and the piston 226 via brake piping (not shown). Then, brake fluid pressure acts on the piston 226 of the caliper 21, and the piston 226 advances toward the disc 11. The piston 226 thus advancing presses the inner-side friction pad 26 disposed between the piston 226 and the disc 11, toward the disc 11. Then, the inner-side friction pad 26 is guided by the mounting member 20 via the first pad spring 24 and the second pad spring 25, and moves toward the inner-side sliding surface 11a of the disc 11 along the disc axial direction.

[0119] At this time, as shown in Fig. 6 and Fig. 7 for the first pad spring 24, the inner-side friction pad 26 abuts against the protrusions 162 of the abutment plate parts 155 of the inner-side return spring parts 113 of the first pad spring 24 and the second pad spring 25, and elastically deforms the main body part 161 toward the disk 11, as shown in Fig. 6 to Fig. 7. At this time, the inner-side friction pad 26 also elastically deforms the outer return spring (not shown). Then, the inner-side friction pad 26 comes into contact with the inner-side sliding surface 11a of the disk 11 at the lining 182 shown in Fig. 1 and is pressed against the disk 11.

[0120] In this state, the outer return spring (not shown) biases the inner friction pad 26 in the return direction away from the disk 11 in the disk axial direction. Also, in this state, as shown in Fig. 7 for the first pad spring 24, the inner return spring portions 113 of the first pad spring 24 and the second pad spring 25 mainly have elastically deformed abutment plate portions 155 biasing the inner friction pad 26 in the return direction away from the disk 11 in the disk axial direction.

[0121] At this time, the inner-side friction pad 26 on the inner side is also pressed toward the rotation side in the disk rotation direction by the frictional force with the rotating disk 11. Then, the torque receiving portion 60 of the first connection portion 46 on the inner side, which is the rotation side in the disk rotation direction of the mounting member 20 shown in FIG. 3, receives a braking torque from the ear portion 192 on the rotation side in the disk rotation direction of the inner-side friction pad 26 via the wall plate portion 123 of the inner-side guide portion 130 of the first pad spring 24.

[0122] 1 presses the inner friction pad 26 against the disk 11, the caliper 21 moves in the disk axial direction as the caliper body 221 slides the first slide pin 222 and the second slide pin 223 relative to the mounting member 20. Then, the claw portion 233 of the caliper body 221 presses the outer friction pad 27 disposed between the claw portion 233 and the disk 11 toward the disk 11. As a result, the outer friction pad 27 is guided by the mounting member 20 via the first pad spring 24 and the second pad spring 25 and moves toward the outer sliding surface 11b of the disk 11 along the disk axial direction.

[0123] At that time, the outer-side friction pad 27 comes into contact with the protrusions 162 of the contact plate portions 155 of the outer-side return spring portions 113 of the first pad spring 24 and the second pad spring 25 as shown in Fig. 6 and Fig. 7 for the first pad spring 24, and elastically deforms the main body portion 161 toward the disk 11 as shown in Fig. 6 to Fig. 7. At that time, the outer-side friction pad 27 also elastically deforms the outer return spring 211 shown in Fig. 2. Then, the outer-side friction pad 27 comes into contact with the outer-side sliding surface 11b of the disk 11 at the lining 182 shown in Fig. 1 and is pressed against the disk 11.

[0124] In this state, the outer return spring 211 biases the outer friction pad 27 in the return direction away from the disk 11 in the disk axial direction. Also, in this state, as shown in Fig. 7 for the first pad spring 24, the outer-side return spring portions 113 of the first pad spring 24 and the second pad spring 25 mainly bias the abutment plate portions 155, which are elastically deformed, in the outer friction pad 27 in the return direction away from the disk 11 in the disk axial direction.

[0125] At this time, the outer friction pad 27 on the outer side is also pressed toward the rotation side in the disk rotation direction by the frictional force with the rotating disk 11. Then, the torque receiving portion 60 of the third connection portion 51 on the outer side, which is on the rotation side in the disk rotation direction of the mounting member 20 shown in Fig. 4, receives a braking torque from the ear portion 192 on the rotation side in the disk rotation direction of the outer friction pad 27 at its fourth surface portion 64 via the wall plate portion 123 of the outer guide portion 130 of the first pad spring 24. Therefore, the fourth surface portion 64 of the engagement recess 75 of the torque receiving portion 60 becomes a torque receiving surface that receives the braking torque of the outer friction pad 27.

[0126] In this manner, the caliper 21 presses the inner friction pad 26 and the outer friction pad 27 against the disc 11. As a result, the disc brake 10 applies frictional resistance to the disc 11, thereby generating a braking force.

[0127] When the braking state is released, in the disc brake 10, the brake fluid pressure between the cylinder hole 241 of the cylinder portion 231 of the caliper 21 and the piston 226 decreases, and the piston 226 moves in a direction away from the disc 11. Then, as shown in Figs. 6 and 7 for the first pad spring 24, the contact plate portion 155 of the inner-side return spring portion 113 of each of the first pad spring 24 and the second pad spring 25 returns from the elastically deformed state as shown in Figs. 7 to 6. At that time, the outer return spring (not shown) provided on the inner-side friction pad 26 also returns from the elastically deformed state. Pressed by the contact plate portion 155 and the outer return spring (not shown), the inner-side friction pad 26 moves in a direction away from the disc 11 in the disc axial direction.

[0128] In addition, when the brake fluid pressure between the cylinder hole 241 of the cylinder portion 231 and the piston 226 decreases, as shown in Fig. 6 and Fig. 7 for the first pad spring 24, the contact plate portion 155 of the outer-side return spring portion 113 of each of the first pad spring 24 and the second pad spring 25 returns from the elastically deformed state as shown in Fig. 7 to Fig. 6. At that time, the outer return spring 211 provided on the outer friction pad 27 also returns from the elastically deformed state. Pressed by the contact plate portion 155 and the outer return spring 211, the outer friction pad 27 moves in the disc axial direction away from the disc 11 while pressing the claw portion 233 of the caliper body 221.

[0129] As described above, the caliper 21 slidably supported on the mounting member 20 clamps the pair of inner friction pad 26 and outer friction pad 27 from both sides in the disk axial direction between the piston 226 and the claw portion 233 by the operation of the piston 226. The caliper 21 presses the inner friction pad 26 against the inner sliding contact surface 11a of the disk 11 and the outer friction pad 27 against the outer sliding contact surface 11b of the disk 11. As a result, the disk brake 10 applies friction resistance to the disk 11 to generate a braking force. The caliper 21 is a so-called fist-type (slide-type) caliper.

[0130] Here, the above operation is performed when the amount of wear of the lining 182 of the inner friction pad 26 and the amount of wear of the lining 182 of the outer friction pad 27 are less than a predetermined amount.

[0131] When the amount of wear of the lining 182 of the inner-side friction pad 26 reaches or exceeds a predetermined amount, as shown in FIG. 8 , the pair of ears 192 of the inner-side friction pad 26 elastically deform the abutment plate portion 155 toward the disk 11 for each of the inner-side return spring portions 113 of the first pad spring 24 and the second pad spring 25, and then abut against the tip side plate portion 154, elastically deforming the inclined extension plate portion 153, the base side plate portion 152 and the curved plate portion 151, thereby moving the tip side plate portion 154, the abutment plate portion 155 and the wear detection portion 156 toward the disk 11.

[0132] In this state, the inner side return spring portion 113 of each of the first pad spring 24 and the second pad spring 25, through the elastically deformed abutment plate portion 155, inclined extension plate portion 153, base end side plate portion 152 and curved plate portion 151, urges the inner side friction pad 26 in the return direction away from the disk 11 in the disk axial direction.

[0133] Here, when the wear amount of the lining 182 of the inner-side friction pad 26 exceeds a preset wear amount that is larger than the above-mentioned predetermined amount, when the lining 182 comes into sliding contact with the inner-side sliding surface 11a of the disk 11, the pair of ears 192 make the flat surface 158 of the wear detection portion 156 of the inner-side return spring portion 113 of each of the first pad spring 24 and the second pad spring 25 be flush with the disk 11 side surface of the lining 182 or protrude toward the disk 11 side beyond the disk 11 side surface of the lining 182 in the disk axial direction. Then, as shown in FIG. 3, the flat surface 158 of the inner-side wear detection portion 156 comes into sliding contact with the inner-side sliding surface 11a of the disk 11. As a result, the inner-side return spring portion 113 of each of the first pad spring 24 and the second pad spring 25 generates a contact sound as an alarm sound.

[0134] In this way, the inner-side return spring portion 113 of each of the first pad spring 24 and the second pad spring 25 notifies that the lining 182 of the inner-side friction pad 26 is in a worn state where the amount of wear thereof exceeds a set amount of wear. In other words, the wear detection portion 156 of the inner-side return spring portion 113 of each of the first pad spring 24 and the second pad spring 25 comes into sliding contact with the disc 11 to notify the wear state of the lining 182 when the amount of wear of the lining 182 of the inner-side friction pad 26 exceeds a preset amount of wear.

[0135] Incidentally, uneven wear may occur in the lining 182 of the inner-side friction pad 26. In this case, the wear detection portion 156 of the inner-side return spring portion 113 of one of the first pad spring 24 and the second pad spring 25 supporting the side in the disc rotation direction, that is, the side in the disc rotation direction or the side in the disc rotation direction, where the wear amount of the lining 182 first exceeds the set wear amount, comes into sliding contact with the inner-side sliding surface 11a of the disc 11, generating a contact noise.

[0136] As a result of the above, the first pad spring 24 and the second pad spring 25 each have a return spring portion 113 on the inner side extending from a curved plate portion 151 connected to a base portion 111 attached to the mounting member 20, and biasing the inner side friction pad 26 in a return direction away from the disk 11 in the disk axial direction.

[0137] When the amount of wear of the lining 182 of the outer friction pad 27 reaches or exceeds a predetermined amount, as shown in FIG. 8 , the pair of ears 192 of the outer friction pad 27 elastically deform the abutment plate portion 155 toward the disk 11 for each of the outer side return spring portions 113 of the first pad spring 24 and the second pad spring 25, and then abut against the tip side plate portion 154, thereby moving the tip side plate portion 154, the abutment plate portion 155 and the wear detection portion 156 toward the disk 11 while elastically deforming the inclined extension plate portion 153, the base side plate portion 152 and the curved plate portion 151.

[0138] In this state, the outer side return spring portion 113 of each of the first pad spring 24 and the second pad spring 25, through the elastically deformed abutment plate portion 155, inclined extension plate portion 153, base end side plate portion 152 and curved plate portion 151, urges the outer side friction pad 27 in the return direction away from the disk 11 in the disk axial direction.

[0139] Here, when the wear amount of the lining 182 of the outer friction pad 27 exceeds a preset wear amount that is larger than the above-mentioned predetermined amount, when the lining 182 slides against the outer sliding surface 11b of the disk 11, the pair of ears 192 make the flat surface 158 of the wear detection portion 156 of the outer return spring portion 113 of each of the first pad spring 24 and the second pad spring 25 flush with the disk 11 side surface of the lining 182 or protrude toward the disk 11 side beyond the disk 11 side surface of the lining 182 in the disk axial direction. Then, as shown in FIG. 3, the flat surface 158 of the outer wear detection portion 156 slides against the outer sliding surface 11b of the disk 11. As a result, the outer return spring portion 113 of each of the first pad spring 24 and the second pad spring 25 generates a contact sound as an alarm sound.

[0140] In this way, the outer-side return spring portion 113 of each of the first pad spring 24 and the second pad spring 25 notifies that the lining 182 of the outer-side friction pad 27 is in a worn state where the amount of wear thereof exceeds a set amount of wear. In other words, the wear detection portion 156 of the outer-side return spring portion 113 of each of the first pad spring 24 and the second pad spring 25 comes into sliding contact with the disc 11 to notify the wear state of the lining 182 when the amount of wear of the lining 182 of the outer-side friction pad 27 exceeds a preset amount of wear.

[0141] Incidentally, uneven wear may occur in the lining 182 of the outer friction pad 27. In this case, the wear detection portion 156 of the outer return spring portion 113 of one of the first pad spring 24 and the second pad spring 25 supporting the side in the disc rotation direction where the wear amount of the lining 182 exceeds the set wear amount first, comes into sliding contact with the outer sliding surface 11b of the disc 11, generating a contact noise.

[0142] As a result of the above, the first pad spring 24 and the second pad spring 25 each have a return spring portion 113 on the outer side extending from a curved plate portion 151 connected to a base portion 111 attached to the mounting member 20, and biasing the outer friction pad 27 in a return direction away from the disk 11 in the disk axial direction.

[0143] The above-mentioned Patent Documents 1 to 3 disclose disc brakes having a pad spring that is attached to a mounting member, movably supports a friction pad, and biases the friction pad in a direction away from the disc. However, it is desirable to reduce the cost of disc brakes.

[0144] In the disc brake 10 of the first embodiment, the first pad spring 24 and the second pad spring 25 have a return spring portion 113 extending from a curved plate portion 151 connected to a base portion 111 attached to the mounting member 20, and biasing the inner side friction pad 26 and the outer side friction pad 27 in a return direction away from the disc 11 in the disc axial direction. The first pad spring 24 and the second pad spring 25 have a wear detection portion 156 formed at a portion of the return spring portion 113 facing the disc 11 away from the curved plate portion 151, which comes into sliding contact with the disc 11 when the wear amount of the lining 182 exceeds a preset wear amount, thereby notifying the wear state of the lining 182. In this way, the wear detection portion 156 is formed in the first pad spring 24 and the second pad spring 25 of the disc brake 10. Therefore, the disc brake 10 can reduce the number of parts compared to a case where a part for detecting wear is provided separately from the pad spring. Therefore, the disc brake 10 makes it possible to reduce component costs and assembly costs.

[0145] Furthermore, in the disc brake 10, when the amount of wear of the lining 182 exceeds a preset amount of wear, the wear detection portion 156 in the return spring portion 113 of the first pad spring 24 and the second pad spring 25 comes into sliding contact with the disc 11 to notify the wear state of the lining 182. Therefore, the disc brake 10 can prevent portions of the return spring portion 113 of the first pad spring 24 and the second pad spring 25 other than the wear detection portion 156 from coming into sliding contact with the disc 11. Therefore, the disc brake 10 can prevent portions of the return spring portion 113 of the first pad spring 24 and the second pad spring 25 other than the wear detection portion 156 from being damaged.

[0146] In addition, in the disc brake 10, a wear detection portion 156 that comes into sliding contact with the disc 11 is formed on the return spring portion 113 extending from the curved plate portion 151 connected to the base portion 111 attached to the mounting member 20 of the first pad spring 24 and the second pad spring 25, so that the contact sound, which is the alert sound, can be made louder.

[0147] In addition, since the wear detection portion 156 of the disc brake 10 is formed with a flat portion 158 that can conform to the inner sliding surface 11a and the outer sliding surface 11b of the disc 11, the aggressiveness of the wear detection portion 156 to the disc 11 can be reduced.

[0148] [Second embodiment] Next, the second embodiment will be described mainly on the basis of Fig. 9 and Fig. 10, focusing on the differences from the first embodiment with reference to Fig. 1 to Fig. 8. Note that the same names and symbols are used for the parts common to the first embodiment.

[0149] In the second embodiment, the first pad spring 24A and the second pad spring 25A shown in FIG. 9 and FIG. 10 are provided instead of the first pad spring 24 and the second pad spring 25, which are partially different from the first pad spring 24 and the second pad spring 25. FIG. 9 and FIG. 10 show the first pad spring 24A and the second pad spring 25A in a natural state before being assembled to the mounting member 20. The first pad spring 24A and the second pad spring 25A are common parts of the same shape, and both have a mirror symmetric shape. The first pad spring 24A and the second pad spring 25A are also formed as a whole by press molding from a single metal plate material of a constant thickness. The first pad spring 24A and the second pad spring 25A have a pair of pad support parts 101A that are partially different from the pair of pad support parts 101 instead of the pair of pad support parts 101. The pair of pad support parts 101A in the natural state have a mirror symmetric shape. Therefore, one pad support portion 101A in the natural state will be described.

[0150] The pad support portion 101A has a return spring portion 113A that is partially different from the return spring portion 113 in place of the return spring portion 113. The return spring portion 113A has a wear detection portion 156A that is different from the wear detection portion 156 in place of the wear detection portion 156.

[0151] The wear detector 156A is flat. The wear detector 156A is formed on the end of the body 161 of the abutting plate 155 opposite the tip side plate 154. The wear detector 156A protrudes from the edge of the body 161 opposite the wall plate 123 in the thickness direction of the wall plate 123. The wear detector 156A protrudes from the body 161 of the pad support 101A on which the wear detector 156A is provided toward the other pad support 101A. The wear detector 156A extends parallel to the wall plate 123. The wear detector 156A has a flat end surface 158A on the opposite side to the body 161 in the thickness direction of the body 161. The flat surface 158A extends perpendicular to the wall plate 123A.

[0152] The first pad spring 24A and the second pad spring 25A are attached to the attachment member 20 in the same manner as the first pad spring 24 and the second pad spring 25.

[0153] In this state, the first pad spring 24A and the second pad spring 25A each have an inner-side return spring portion 113A extending from the curved plate portion 151 connected to the inner-side base portion 111. Also, in this state, the first pad spring 24A and the second pad spring 25A each have an outer-side return spring portion 113A extending from the curved plate portion 151 connected to the outer-side base portion 111. Also, in this state, the first pad spring 24A and the second pad spring 25A each have a wear detection portion 156A at a portion of the inner-side return spring portion 113A facing the inner-side sliding surface 11a of the disc 11 separated from the curved plate portion 151. In this state, the first pad spring 24A and the second pad spring 25A have a wear detection portion 156A at a portion of the outer side return spring portion 113A facing the outer side sliding contact surface 11b of the disk 11 separated from the curved plate portion 151. In this state, the first pad spring 24A and the second pad spring 25A have a flat portion 158A formed on the wear detection portion 156A of the inner side return spring portion 113A, which can be aligned with the inner side sliding contact surface 11a of the disk 11. In this state, the first pad spring 24A and the second pad spring 25A have a flat portion 158A formed on the wear detection portion 156A of the outer side return spring portion 113A, which can be aligned with the outer side sliding contact surface 11b of the disk 11.

[0154] Then, in the same manner as the first pad spring 24 and the second pad spring 25, the inner friction pad 26 and the outer friction pad 27 are engaged with the first pad spring 24A and the second pad spring 25A attached to the mounting member 20.

[0155] In the second embodiment, during braking and when the braking state is released, the caliper 21, the first pad spring 24A, the second pad spring 25A, the inner friction pad 26, and the outer friction pad 27 operate in substantially the same manner as in the first embodiment.

[0156] In the second embodiment, when the wear amount of the lining 182 of the inner side friction pad 26 exceeds a preset wear amount, when the lining 182 slides against the inner side sliding contact surface 11a of the disk 11, the pair of ears 192 make the flat surface 158A of the wear detection portion 156A of the inner side return spring portion 113A of each of the first pad spring 24A and the second pad spring 25A flush with the disk 11 side surface of the lining 182 or protrude toward the disk 11 side beyond the disk 11 side surface of the lining 182 in the disk axial direction. Then, the flat surface 158A of the wear detection portion 156A slides against the inner side sliding contact surface 11a of the disk 11. As a result, the inner side return spring portion 113A of each of the first pad spring 24A and the second pad spring 25A generates a contact sound as an alarm sound.

[0157] In this way, the inner-side return spring portion 113A of each of the first pad spring 24A and the second pad spring 25A notifies that the lining 182 of the inner-side friction pad 26 is in a worn state where its wear amount exceeds a set wear amount. In other words, the wear detection portion 156A of the inner-side return spring portion 113A of each of the first pad spring 24A and the second pad spring 25A comes into sliding contact with the disc 11 to notify the wear state of the lining 182 when the wear amount of the lining 182 of the inner-side friction pad 26 exceeds a preset wear amount.

[0158] Incidentally, uneven wear may occur in the lining 182 of the inner-side friction pad 26. In this case, the wear detection portion 156A of the inner-side return spring portion 113A of one of the first pad spring 24A and the second pad spring 25A supporting the side in the disc rotation direction or the side in the disc rotation direction where the wear amount of the lining 182 exceeds the set wear amount first comes into sliding contact with the inner-side sliding surface 11a of the disc 11, generating a contact noise.

[0159] As a result of the above, the first pad spring 24A and the second pad spring 25A each have a return spring portion 113A on the inner side extending from a curved plate portion 151 connected to a base portion 111 attached to the mounting member 20, and biasing the inner side friction pad 26 in a return direction away from the disk 11 in the disk axial direction.

[0160] In the second embodiment, when the wear amount of the lining 182 of the outer friction pad 27 exceeds a preset wear amount, the pair of ears 192 make the flat surface 158A of the wear detection portion 156A of the outer return spring portion 113A of each of the first pad spring 24A and the second pad spring 25A flush with the surface of the lining 182 on the disk 11 side or protrude toward the disk 11 side beyond the surface of the lining 182 on the disk 11 side in the disk axial direction when the lining 182 slides against the outer sliding surface 11b of the disk 11. As a result, the outer return spring portion 113A of each of the first pad spring 24A and the second pad spring 25A generates a contact sound as an alarm sound.

[0161] In this way, the outer-side return spring portion 113A of each of the first pad spring 24A and the second pad spring 25A notifies the wear state of the lining 182 of the outer-side friction pad 27, the amount of wear of which has exceeded a set amount of wear. In other words, the wear detection portion 156A of the outer-side return spring portion 113A of each of the first pad spring 24A and the second pad spring 25A comes into sliding contact with the disc 11 to notify the wear state of the lining 182 when the amount of wear of the lining 182 of the outer-side friction pad 27 exceeds a preset amount of wear.

[0162] Incidentally, uneven wear may occur in the lining 182 of the outer friction pad 27. In this case, the wear detection portion 156A of the outer return spring portion 113A of one of the first pad spring 24A and the second pad spring 25A supporting the side in the disc rotation direction where the wear amount of the lining 182 exceeds the set wear amount first, comes into sliding contact with the outer sliding surface 11b of the disc 11, generating a contact noise.

[0163] As a result of the above, the first pad spring 24A and the second pad spring 25A each have a return spring portion 113A on the outer side extending from a curved plate portion 151 connected to a base portion 111 attached to the mounting member 20, and biasing the outer side friction pad 27 in a return direction away from the disk 11 in the disk axial direction.

[0164] In the second embodiment, the first pad spring 24A and the second pad spring 25A have a wear detection portion 156A formed at a portion of the return spring portion 113A facing the disc 11 away from the curved plate portion 151, the wear detection portion 156A coming into sliding contact with the disc 11 when the wear amount of the lining 182 exceeds a preset wear amount to indicate the wear state of the lining 182. In this way, in the second embodiment, the wear detection portion 156A is formed at a position away from the curved plate portion 151 of the first pad spring 24A and the second pad spring 25A, so that the same effect as the first embodiment can be achieved.

[0165] In addition, in the second embodiment, the first pad spring 24A and the second pad spring 25A have a flat portion 158A formed in the wear detection portion 156A that can conform to the inner side sliding surface 11a and the outer side sliding surface 11b of the disk 11, thereby suppressing the aggressiveness of the wear detection portion 156A to the disk 11.

[0166] [Third embodiment] Next, the third embodiment will be described mainly on the basis of Figures 11 to 13, focusing on the differences from the first embodiment with reference to Figures 1 to 8. Note that the same names and symbols are used for the parts common to the first embodiment.

[0167] In the third embodiment, the first pad spring 24B and the second pad spring 25B shown in FIG. 11 and FIG. 12 are provided instead of the first pad spring 24 and the second pad spring 25, which are partially different from the first pad spring 24 and the second pad spring 25. FIG. 11 and FIG. 12 show the first pad spring 24B and the second pad spring 25B in a natural state before being assembled to the mounting member 20. The first pad spring 24B and the second pad spring 25B are common parts of the same shape, and both have a mirror-symmetric shape. The first pad spring 24B and the second pad spring 25B are also formed entirely by press molding from a single metal plate material of a constant thickness. The first pad spring 24B and the second pad spring 25B have a pair of pad support parts 101B that are partially different from the pair of pad support parts 101 instead of the pair of pad support parts 101. The pair of pad support parts 101B in the natural state have a mirror-symmetric shape. Therefore, one pad support portion 101B in the natural state will be described.

[0168] The pad support portion 101B has a return spring portion 113B which is partially different from the return spring portion 113, instead of the return spring portion 113. As shown in Fig. 11, the return spring portion 113B has a curved plate portion 151B, a folded plate portion 252, a middle curved plate portion 253, an inner support plate portion 254, a locking plate portion 255, a protruding plate portion 256, and a wear detection portion 156B.

[0169] The curved plate portion 151B protrudes from an edge portion of the inner extending plate portion 124 of the one pad support portion 101B on which the curved plate portion 151B is provided, opposite the other pad support portion 101B, toward the opposite side to the outer support plate portion 122 in the thickness direction of the inner extending plate portion 124. The curved plate portion 151B of one pad support portion 101B is curved about a central axis line that is located on the other pad support portion 101B side and opposite the outer support plate portion 122 in the thickness direction of the inner extending plate portion 124.

[0170] The folded plate portion 252 extends from the edge portion opposite the inner extending plate portion 124 of the curved plate portion 151B of one pad support portion 101B on which the folded plate portion 252 is provided to the opposite side to the outer support plate portion 122 in the thickness direction of the inner extending plate portion 124, then curves to the opposite side to the other pad support portion 101B, and then extends toward the outer support plate portion 122 in the thickness direction of the inner extending plate portion 124. The folded plate portion 252 is U-shaped.

[0171] The middle curved plate portion 253 extends from an edge portion opposite the curved plate portion 151B of the folded plate portion 252 of one pad support portion 101B on which the middle curved plate portion 253 is provided, to the opposite side to the other pad support portion 101B, and then extends to the outer support plate portion 122 side and the other pad support portion 101B side in the thickness direction of the inner extending plate portion 124, and then extends to the opposite side to the outer support plate portion 122 in the thickness direction of the inner extending plate portion 124. The middle curved plate portion 253 is C-shaped.

[0172] The inner support plate portion 254 is flat and extends from an edge portion of the middle curved plate portion 253 of the one pad support portion 101B on which the inner support plate portion 254 is provided, opposite to the folded plate portion 252, toward the other pad support portion 101B and toward the outer support plate portion 122 in the thickness direction of the inner extending plate portion 124.

[0173] The locking plate portion 255 is flat. The locking plate portion 255 extends from an edge portion of the inner support plate portion 254 of one pad support portion 101B on the side opposite to the middle curved plate portion 253, to the side opposite to the other pad support portion 101B and toward the outer support plate portion 122 in the thickness direction of the inner extending plate portion 124. The locking plate portion 255 extends substantially perpendicular to the inner support plate portion 254.

[0174] The protruding plate portion 256 is flat and protrudes from an edge portion of the inner support plate portion 254 on the wall plate portion 123 side in the thickness direction of the wall plate portion 123 to the opposite side to the outer support plate portion 122 in the thickness direction of the inner extending plate portion 124.

[0175] The wear detection portion 156B is flat. The wear detection portion 156B protrudes from the edge of the locking plate portion 255 on the opposite side to the wall plate portion 123 in the thickness direction of the wall plate portion 123. The wear detection portion 156B protrudes from the locking plate portion 255 of one pad support portion 101B on which the wear detection portion 156B is provided, toward the other pad support portion 101B. The wear detection portion 156B spreads perpendicularly to the locking plate portion 255. The end surface of the wear detection portion 156B on the opposite side to the locking plate portion 255 in the thickness direction of the locking plate portion 255 is a flat surface portion 158B.

[0176] As a result, the return spring portion 113B extends from the curved plate portion 151B connected to the base portion 111.

[0177] Each of the first pad spring 24B and the second pad spring 25B has a pair of pad supporting portions 101B having the above-mentioned configuration arranged in a mirror symmetrical manner.

[0178] The first pad spring 24B is attached to the first connection part 46 and the third connection part 51 of the mounting member 20, both of which are on the rotation-out side in the disc rotation direction, in the same manner as the first pad spring 24. The second pad spring 25B is attached to the second connection part 47 and the fourth connection part 52 of the mounting member 20, both of which are on the rotation-in side in the disc rotation direction, in the same manner as the second pad spring 25.

[0179] When the first pad spring 24B and the second pad spring 25B are attached to the mounting member 20, the return spring portion 113B as a whole extends radially outward from the edge portion of the inner extension plate portion 124 opposite the disk 11 in the disk axial direction, toward the disk 11 in the disk axial direction.

[0180] The outer friction pad 27 is oriented in such a way that the lining 182 is disposed closer to the disk 11 than the back plate 181 in the disk axial direction, and the ear 192 on the disk rotation direction rotation side is engaged with the outer pad support portion 101B attached to the third connection portion 51 of the first pad spring 24B. Also, the outer friction pad 27 is engaged with the outer pad support portion 101B attached to the fourth connection portion 52 of the second pad spring 25B, and the ear 192 on the disk rotation direction rotation side is engaged with the outer pad support portion 101B attached to the fourth connection portion 52 of the second pad spring 25B. In this way, the outer friction pad 27 is attached to the attachment member 20 via the first pad spring 24B and the second pad spring 25B.

[0181] At this time, as shown in Fig. 13, the ear 192 on the rotation side in the disk rotation direction of the outer friction pad 27 is inserted into the guide portion 130 of the outer pad support portion 101B of the first pad spring 24B. At this time, the ear 192 on the rotation side in the disk rotation direction of the outer friction pad 27 elastically deforms mainly the middle curved plate portion 253 so as to move the inner support plate portion 254 of the return spring portion 113B of the outer pad support portion 101B of the first pad spring 24B away from the outer support plate portion 122. As a result, the outer pad support portion 101B of the first pad spring 24B is in a state in which the inner support plate portion 254 is aligned with the outer support plate portion 122.

[0182] Then, the outer-side return spring portion 113B of the first pad spring 24B abuts against the inner side surface portion 201 of the ear portion 192 on the disc rotation direction rotation side of the outer-side friction pad 27 at the inner support plate portion 254, and presses the ear portion 192 outward in the disc radial direction. As a result, the outer side surface portion 202 of the ear portion 192 is pressed against the outer support plate portion 122 of the outer-side base portion 111 of the first pad spring 24B, and comes into surface contact. As a result, the ear portion 192 on the disc rotation direction rotation side of the outer-side friction pad 27 is attached to the outer-side pad support portion 101B of the first pad spring 24B and is elastically supported in the disc radial direction.

[0183] In this state, the outer side return spring portion 113B of the first pad spring 24B has the locking plate portion 255 disposed on the disk 11 side in the disk axial direction of the ear portion 192 on the disk rotation direction rotation side of the outer side friction pad 27. Also, in this state, the locking plate portion 255 faces the outer side sliding contact surface 11b of the disk 11 and spreads along the outer side sliding contact surface 11b. Also, in this state, the outer side return spring portion 113B of the first pad spring 24B has the wear detection portion 156B protruding from the locking plate portion 255 toward the disk 11 side in the disk axial direction. Also, in this state, the outer side return spring portion 113B of the first pad spring 24B has the flat portion 158B of the wear detection portion 156B spread along the outer side sliding contact surface 11b of the disk 11. In this state, the ear 192 on the rotation side of the outer friction pad 27 in the disc rotation direction is movable relative to the outer pad support portion 101B of the first pad spring 24B and the third connection portion 51 of the mounting member 20 in the disc axial direction.

[0184] Here, the return spring portion 113B is capable of moving the locking plate portion 255 in the disk axial direction by elastic deformation of the curved plate portion 151B, the folded plate portion 252, and the intermediate curved plate portion 253. Therefore, when the locking plate portion 255 of the return spring portion 113B is pressed toward the disk 11 in the disk axial direction by the ear portion 192, the locking plate portion 255 moves toward the disk 11 in the axial direction together with the wear detection portion 156B.

[0185] The outer friction pad 27 has its ear 192 on the disk rotation direction rotation side attached to the outer pad support portion 101B of the second pad spring 25. At this time, the ear 192 on the disk rotation direction rotation side of the outer friction pad 27 is attached to the outer pad support portion 101B of the second pad spring 25B in the same manner as the above-mentioned ear 192 on the disk rotation direction rotation side is attached to the outer pad support portion 101B of the second pad spring 25B and is elastically supported in the disk radial direction.

[0186] In this state, the ear 192 on the rotation side of the outer friction pad 27 in the disc rotation direction is movable in the disc axial direction relative to the outer pad support portion 101B of the second pad spring 25B and the fourth connection portion 52 of the mounting member 20.

[0187] In the same manner as the above-described attachment of the outer-side friction pad 27 to the third connecting portion 51 and the fourth connecting portion 52 of the attachment member 20 via the outer-side pad supporting portion 101B of the first pad spring 24B and the outer-side pad supporting portion 101B of the second pad spring 25B, the inner-side friction pad 26 is attached to the first connecting portion 46 and the second connecting portion 47 of the attachment member 20 via the inner-side pad supporting portion 101B of the first pad spring 24B and the inner-side pad supporting portion 101B of the second pad spring 25B. Then, as shown in Fig. 13, the ear portion 192 on the rotation side of the inner-side friction pad 26 in the disc rotation direction is elastically supported by the inner-side pad supporting portion 101B of the first pad spring 24B so as to be movable in the disc axial direction.

[0188] In this state, the ear 192 on the rotation side in the disc rotation direction of the inner friction pad 26 is movable in the disc axial direction relative to the inner pad support portion 101B of the first pad spring 24B and the first connection portion 46 of the mounting member 20. Also, the ear (not shown) on the rotation side in the disc rotation direction of the inner friction pad 26 is elastically supported by the inner pad support portion 101B of the second pad spring 25B so as to be movable in the disc axial direction.

[0189] In this state, the ear portion (not shown) on the rotation side of the inner friction pad 26 in the disc rotation direction becomes movable in the disc axial direction relative to the inner pad support portion 101B of the second pad spring 25B and the second connection portion 47 of the mounting member 20.

[0190] The inner friction pad 26 and the outer friction pad 27 in a state of being attached to the attachment member 20 via the first pad spring 24B and the second pad spring 25B each have the return spring portion 113B disposed on the disc radially inward side of the ear portion 192. The pair of return spring portions 113B of the first pad spring 24B and the second pad spring 25B supporting the inner friction pad 26 and the outer friction pad 27 each urges the ear portion 192 abutting against the locking plate portion 255 in a return direction in which the curved plate portion 151B, the folded plate portion 252 and the intermediate curved plate portion 253 move away from the disc 11 in the disc axial direction.

[0191] When braking while the vehicle is traveling forward, brake fluid is introduced between the cylinder hole 241 of the cylinder portion 231 of the caliper 21 and the piston 226. Then, brake fluid pressure acts on the piston 226 of the caliper 21, and the piston 226 advances toward the disk 11. The piston 226 advancing in this manner presses the inner-side friction pad 26 disposed between the piston 226 and the disk 11, toward the disk 11. Then, the inner-side friction pad 26 is guided by the mounting member 20 via the first pad spring 24B and the second pad spring 25B, and moves toward the inner-side sliding surface 11a of the disk 11 along the disk axial direction.

[0192] At this time, the inner friction pad 26 abuts against the locking plate portion 255 of the inner return spring portion 113B of each of the first pad spring 24B and the second pad spring 25B at the ear portion 192 as shown in FIG. 13 for the first pad spring 24B, and moves the locking plate portion 255 and the wear detection portion 156B toward the inner sliding surface 11a of the disk 11 along the disk axial direction while elastically deforming the curved plate portion 151B, the folded plate portion 252, and the middle curved plate portion 253. At this time, the inner friction pad 26 elastically deforms the outer return spring (not shown). Then, the inner friction pad 26 contacts one of the inner sliding surfaces 11a of the disk 11 at the lining 182 and is pressed against the disk 11.

[0193] In this state, the outer return spring (not shown) biases the inner friction pad 26 in the return direction away from the disk 11 in the disk axial direction. Also, in this state, the curved plate portion 151B, the folded plate portion 252, and the middle curved plate portion 253 of the inner return spring portion 113B of each of the first pad spring 24B and the second pad spring 25B bias the inner friction pad 26 in the return direction away from the disk 11 in the disk axial direction.

[0194] Due to the reaction force of the piston 226 pressing the inner friction pad 26 against the disk 11, the caliper 21 moves in the disk axial direction as the caliper body 221 slides the first slide pin 222 and the second slide pin 223 relative to the mounting member 20. Then, the claw portion 233 of the caliper body 221 presses the outer friction pad 27 disposed between the claw portion 233 and the disk 11 toward the disk 11. As a result, the outer friction pad 27 is guided by the mounting member 20 via the first pad spring 24B and the second pad spring 25B and moves toward the outer sliding contact surface 11b of the disk 11 along the disk axial direction.

[0195] At this time, as shown in Fig. 13 for the first pad spring 24B, the outer friction pad 27 abuts against the locking plate portion 255 of the outer return spring portion 113B of each of the first pad spring 24B and the second pad spring 25B at the ear portion 192, and moves the locking plate portion 255 and the wear detection portion 156B along the disk axial direction toward the outer sliding surface 11b of the disk 11 while elastically deforming the curved plate portion 151B, the folded plate portion 252, and the intermediate curved plate portion 253. At this time, the outer friction pad 27 elastically deforms the outer return spring 211. Then, the outer friction pad 27 contacts the other outer sliding surface 11b of the disk 11 at the lining 182 and is pressed against the disk 11.

[0196] In this state, the outer return spring 211 biases the outer friction pad 27 in the return direction away from the disk 11 in the disk axial direction. Also, in this state, the curved plate portion 151B, the folded plate portion 252, and the intermediate curved plate portion 253 of the outer return spring portion 113B of each of the first pad spring 24B and the second pad spring 25B bias the outer friction pad 27 in the return direction away from the disk 11 in the disk axial direction.

[0197] In this manner, the caliper 21 presses the inner friction pad 26 and the outer friction pad 27 against the disk 11. As a result, the inner friction pad 26 and the outer friction pad 27 apply frictional resistance to the disk 11, generating a braking force.

[0198] When the braking state is released, the brake fluid pressure between the cylinder hole 241 of the cylinder portion 231 of the caliper 21 and the piston 226 decreases, and the piston 226 moves in a direction away from the disk 11. Then, the curved plate portion 151B, the folded plate portion 252, and the intermediate curved plate portion 253 of the inner side return spring portion 113B of each of the first pad spring 24B and the second pad spring 25B return from the elastically deformed state. At that time, the outer return spring (not shown) provided on the inner side friction pad 26 also returns from the elastically deformed state. As a result, the inner side friction pad 26 moves in a direction away from the disk 11 by being pressed by the locking plate portion 255 and the outer return spring (not shown) of the inner side return spring portion 113B of each of the first pad spring 24B and the second pad spring 25B.

[0199] In addition, when the brake fluid pressure between the cylinder hole 241 of the cylinder portion 231 and the piston 226 decreases, the curved plate portion 151B, the folded plate portion 252, and the intermediate curved plate portion 253 of the outer side return spring portion 113B of each of the first pad spring 24B and the second pad spring 25B return from the elastically deformed state. At that time, the outer return spring 211 provided on the outer side friction pad 27 also returns from the elastically deformed state. As a result, the outer side friction pad 27 is pressed by the locking plate portion 255 of the outer side return spring portion 113B of each of the first pad spring 24B and the second pad spring 25B and the outer return spring (not shown), and moves in a direction away from the disk 11 while pressing the claw portion 233 of the caliper body 221.

[0200] As described above, the closer the pair of ears 192 of the inner friction pad 26 and the pair of ears 192 of the outer friction pad 27 are to the disk 11 in the disk axial direction, the closer the wear detection portion 156B of the engaging return spring portion 113B is to the disk 11.

[0201] When the wear amount of the lining 182 exceeds a preset wear amount, the pair of ears 192 of the inner friction pad 26 causes the flat surface 158B of the wear detection portion 156B of the inner return spring portion 113B of each of the first pad spring 24B and the second pad spring 25B to be flush with the surface of the lining 182 on the disk 11 side in the disk axial direction or to protrude toward the disk 11 side beyond the surface of the lining 182 on the disk 11 side. Then, the flat surface 158B of the wear detection portion 156B comes into sliding contact with the inner sliding surface 11a of the disk 11. As a result, the inner return spring portion 113B of each of the first pad spring 24B and the second pad spring 25B generates a contact sound as an alarm sound.

[0202] In this way, the inner-side return spring portion 113B of each of the first pad spring 24B and the second pad spring 25B notifies that the lining 182 of the inner-side friction pad 26 is in a worn state where its wear amount exceeds a set wear amount. In other words, the wear detection portion 156B of the inner-side return spring portion 113B of each of the first pad spring 24B and the second pad spring 25B comes into sliding contact with the disc 11 to notify the wear state of the lining 182 when the wear amount of the lining 182 of the inner-side friction pad 26 exceeds a preset wear amount.

[0203] Incidentally, uneven wear may occur in the lining 182 of the inner-side friction pad 26. In this case, the wear detection portion 156B of the inner-side return spring portion 113B of one of the first pad spring 24B and the second pad spring 25B supporting the side in the disc rotation direction, or the side in the disc rotation direction, where the wear amount of the lining 182 first exceeds the set wear amount, comes into sliding contact with the inner-side sliding surface 11a of the disc 11, generating a contact noise.

[0204] As a result of the above, the first pad spring 24B and the second pad spring 25B each have a return spring portion 113B on the inner side extending from a curved plate portion 151B connected to a base portion 111 attached to the mounting member 20, and biasing the inner side friction pad 26 in a return direction away from the disk 11 in the disk axial direction.

[0205] When the wear amount of the lining 182 of the outer friction pad 27 exceeds a preset wear amount, the pair of ears 192 make the flat surface 158B of the wear detection portion 156B of the outer side return spring portion 113B of each of the first pad spring 24B and the second pad spring 25B flush with the surface of the lining 182 on the disk 11 side or protrude toward the disk 11 side beyond the surface of the lining 182 on the disk 11 side in the disk axial direction when the lining 182 slides against the outer side sliding surface 11b of the disk 11. As a result, the outer side return spring portion 113B of each of the first pad spring 24B and the second pad spring 25B generates a contact sound as an alarm sound.

[0206] In this way, the outer-side return spring portion 113B of each of the first pad spring 24B and the second pad spring 25B notifies that the lining 182 of the outer-side friction pad 27 is in a worn state where its wear amount exceeds a set wear amount. In other words, the wear detection portion 156B of the outer-side return spring portion 113B of each of the first pad spring 24B and the second pad spring 25B comes into sliding contact with the disc 11 to notify the wear state of the lining 182 when the wear amount of the lining 182 of the outer-side friction pad 27 exceeds a preset wear amount.

[0207] Incidentally, uneven wear may occur in the lining 182 of the outer friction pad 27. In this case, the wear detection portion 156B of the outer return spring portion 113B of one of the first pad spring 24B and the second pad spring 25B supporting the side in the disc rotation direction where the wear amount of the lining 182 exceeds the set wear amount first, comes into sliding contact with the outer sliding surface 11b of the disc 11, generating a contact noise.

[0208] As a result of the above, the first pad spring 24B and the second pad spring 25B each have a return spring portion 113B on the outer side extending from a curved plate portion 151B connected to a base portion 111 attached to the mounting member 20, and biasing the outer side friction pad 27 in a return direction away from the disk 11 in the disk axial direction.

[0209] In the third embodiment, the first pad spring 24B and the second pad spring 25B have a wear detection portion 156B formed at a portion of the return spring portion 113B facing the disc 11 spaced from the curved plate portion 151B, the wear detection portion 156B coming into sliding contact with the disc 11 when the wear amount of the lining 182 exceeds a preset wear amount to indicate the wear state of the lining 182. In this way, in the third embodiment, the wear detection portion 156B is formed at a position spaced from the curved plate portion 151B of the first pad spring 24B and the second pad spring 25B, so that the same effect as the first embodiment can be achieved.

[0210] In addition, in the third embodiment, the first pad spring 24B and the second pad spring 25B have a flat portion 158B formed in the wear detection portion 156B that can conform to the inner side sliding surface 11a and the outer side sliding surface 11b of the disc 11, thereby suppressing the aggressiveness of the wear detection portion 156B to the disc 11. [Explanation of symbols]

[0211] 10... disc brake, 11... disc, 11a... inner sliding surface (sliding surface), 11b... outer sliding surface (sliding surface), 20... mounting member, 21... caliper, 24, 24A, 24B... first pad spring (pad spring), 25, 25A, 25B... second pad spring (pad spring), 26... inner friction pad (friction pad), 27... outer friction pad (friction pad), 60... torque receiving portion, 113, 113A, 113B... return spring portion, 151, 151B... curved plate portion, 156, 156A, 156B... wear detection portion, 158, 158A, 158B... flat portion, 182... lining.

Claims

1. A mounting member that is attached to a non-rotating portion of a vehicle and has a torque receiving portion in a rotational direction of the disk; A friction pad movable in the axial direction of the disk; a caliper supported by the mounting member and pressing the friction pad against the disk; a pad spring including a return spring portion extending from a curved plate portion connected to a base portion attached to the mounting member, the return spring portion biasing the friction pad in a return direction away from the disk; A disc brake comprising: The return spring portion is provided at a portion facing the disc, spaced from the curved plate portion, with a wear detection portion formed therein that comes into sliding contact with the disc when the wear amount of the lining of the friction pad exceeds a preset set wear amount, thereby indicating the wear state of the lining.

2. 2. The disc brake according to claim 1, A disc brake, wherein the wear detection portion is formed with a flat portion that can conform to the sliding surface of the disc.

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