DISC BRAKE

Abstract

A pad spring (24) on a disc rotation input side has a first support portion (131) that elastically supports a friction pad (27) in a disc radial direction, and a second support portion (120) that is offset from the first support portion (131) in a disc radial direction, covers a torque receiving portion (60), and elastically supports the friction pad (27) in the disc rotation direction. The disc brake has a first state in which one of a first support portion (131) and a second support portion (120) comes into contact with the friction pad (27) and the other has a gap (S) between the other and the friction pad (27), and a second state in which the gap (S) is filled by the movement of the friction pad (27).

Description

TECHNICAL FIELD

[0001] The present invention relates to a disc brake. Priority is claimed to Japanese Patent Application No. 2022-191119, filed on November 30, 2022, the contents of which are incorporated herein by reference. STATE OF THE ART

[0002] A disc brake is known which has a pad spring which is fixed to a fixing member and elastically supports a friction pad (see, for example, Patent Document 1). Citation listPatent document

[0003] Patent Document 1: Japanese Unexamined Patent Application, First Publication No. 2021-116882 DESCRIPTION OF THE INVENTIONTechnical problem

[0004] In the disc brake, it is desirable to suppress the generation of abnormal noise.

[0005] The present invention provides a disc brake capable of suppressing the generation of abnormal noise. Solution to the problem

[0006] According to a first aspect of the present invention, a disc brake comprises: a fastening member fixed to a non-rotating portion of a vehicle and having a torque-absorbing portion in the disc rotation direction; a friction pad movable in the disc axial direction; a brake caliper supported by the fastening member and pressing the friction pad against a disc; and a pad spring attached to the fastening member and elastically supporting the friction pad. The pad spring on a disc rotation input side has a first support portion that elastically supports the friction pad in the disc rotation direction, and a second support portion that is offset in the disc radial direction from the first support portion, covers the torque-absorbing portion, and elastically supports the friction pad in the disc rotation direction.The disc brake has a first state in which either the first support portion or the second support portion comes into contact with the friction lining and the other has a gap between itself and the friction lining, and a second state in which the gap is filled by the movement of the friction lining.

[0007] According to a second aspect of the present invention, a disc brake comprises: a fastening member fixed to a non-rotating portion of a vehicle and having a torque-absorbing portion in the disc rotation direction; a friction pad movable in the disc axial direction; a brake caliper supported by the fastening member and pressing the friction pad against a disc; and a pad spring attached to the fastening member and elastically supporting the friction pad. The pad spring on a disc rotation input side has a first support portion that elastically supports the friction pad in the disc rotation direction, and a second support portion that is offset from the first support portion in the disc radial direction, covers the torque-absorbing portion, and elastically supports the friction pad in the disc rotation direction.A spring constant of the first support section is smaller than a spring constant of the second support section. Advantageous effects of the invention

[0008] According to the present invention, it is possible to suppress the generation of abnormal noises. BRIEF DESCRIPTION OF THE DRAWINGS [ Fig. 1] A perspective view of a disc brake of one embodiment. [ Fig. 2] A perspective view of the disc brake of the embodiment, excluding components of a brake caliper other than a slide pin. [ Fig. 3] A view of the disc brake of the embodiment, excluding components of the caliper other than the slide pin, viewed from the inside of the disc radial direction. [ Fig. 4] A view of the disc brake of the embodiment, excluding components of the brake caliper other than the slide pin, seen from an inner side. [ Fig. 5] A view of the disc brake of the embodiment, excluding the brake caliper, seen from an outer side. [ Fig. 6] A partial view of the disc brake of the embodiment, excluding a return spring and a rivet, seen from an outer side. [ Fig. 7] A perspective view of a first pad spring of the disc brake of the embodiment. [ Fig. 8] A side view of the first pad spring of the disc brake of the embodiment. [ Fig. 9] A partial side view of the first pad spring of the disc brake of the embodiment. [ Fig. 10] A side view of a second pad spring of the disc brake of the embodiment. [ Fig. 11] A schematic view of a first state of the disc brake of the embodiment, viewed from an outer side. DESCRIPTION OF EMBODIMENTS

[0009] An embodiment will be described below with reference to the drawings. A disc brake 10 of the type shown in Fig. The embodiment shown in Figure 1 is for a vehicle, such as an automobile, and applies a braking force to the vehicle. The disc brake 10 is used, in particular, for 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] The disc brake 10 has a fastening element 20, a brake caliper 21, a first pin sleeve 22, a second pin sleeve 23, a first pad spring 24 (pad spring), a second pad spring 25, a first friction pad 26 and a second friction pad 27.

[0011] Hereinafter, the central axis of the disc 11 is referred to as the disc axis. Furthermore, the extension direction of the disc axis 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 rotational direction, i.e., the circumferential direction of the disc 11 in the disc brake 10, is referred to as the disc rotation direction. The center of the disc 11 in the disc radial direction is referred to as the inner side of the disc. The side opposite the center of the disc 11 in the disc radial direction is referred to as the outer side of the disc. The middle side of the length of the disc rotation direction in the disc brake 10 is referred to as the inner disc rotation side. The side opposite the center of the length of the disc rotation direction in the disc brake 10 is referred to as the outer disc rotation side.A line passing through the disc axis and the center of the fastening element 20 and the brake caliper 21 in the disc rotation direction and extending along the disc radial direction is called the radial reference line. This radial reference line is orthogonal to the disc axis. A plane containing the radial reference line and the disc axis is called the radial reference plane.

[0012] The outer side in the vehicle width direction of the vehicle equipped with the disc brake 10 is called the outer side. The inner side in the vehicle width direction of the vehicle equipped with the disc brake 10 is called the inner side. The input side of the rotation direction Fr of the disc 11 in the disc brake 10 when the vehicle equipped with the disc brake 10 is traveling forward is called the forward disc rotation input side (disc rotation input side). The output side of the rotation direction Fr of the disc 11 in the disc brake 10 when the vehicle equipped with the disc brake 10 is traveling forward is called the forward disc rotation output side (the disc rotation output side). The forward disc rotation input side is the output side of the rotation direction of the disc 11 in the disc brake 10 when the vehicle equipped with the disc brake 10 is traveling backward.The output side of the rotation direction of the disc 11 in the disc brake 10 when the vehicle is reversing is called the reverse disc rotation output side. The forward disc rotation output side is the input side of the rotation direction of the disc 11 in the disc brake 10 when the vehicle equipped with the disc brake 10 is reversing. The input side of the rotation direction of the disc 11 in the disc brake 10 when the vehicle is reversing is called the reverse disc rotation input side.

[0013] As in Fig. As shown in Figure 2, the fastening element 20 is provided in the vehicle over the outer periphery of the disc 11. In this state, the fastening element 20 is fixed to a non-rotating portion (not shown) of the vehicle. The fastening element 20 has an inside locating portion 31, an outside locating portion 32, and a pair of first and second connecting portions 33 and 34 connecting them. The fastening element 20 has a shape that is substantially mirror-symmetrical with respect to a radial reference plane.

[0014] Disc 11 has, as in Fig. 3, a first braking surface 11a arranged on one side in the axial direction of the disc, and a second braking surface 11b arranged on the other side in the axial direction of the disc. The first braking surface 11a is arranged on the inner side of the disc 11. The second braking surface 11b is arranged on the outer side of the disc 11.

[0015] The inside arrangement portion 31 is arranged on one side of the disc 11 in the axial direction of the disc and is fixed to the non-rotating portion of the vehicle. The non-rotating portion of the vehicle, which is fixed with the fastening element 20, is arranged on the inside of the disc 11. Thus, the inside arrangement portion 31, which is fixed to the non-rotating portion, is also arranged on the inside of the disc 11. The inside arrangement portion 31 faces the first braking surface 11a of the disc 11. The inside arrangement portion 31 carries the Fig. 2 is arranged so that it is movable in the axial direction of the disc. In other words, the first friction lining 26 is movable in the axial direction of the disc. The first friction lining 26 is arranged on the inner side of the disc 11. The first friction lining 26 faces the first braking surface 11a of the disc 11.

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

[0017] The first connecting portion 33 and the second connecting portion 34 extend in the axial direction of the disk and are provided over the outer periphery of the disk 11 in the axial direction of the disk. The first connecting portion 33 connects the end portions of the inner-side arrangement portion 31 and the outer-side arrangement portion 32 on the outer disk radial side and the forward disk rotation input side. The second connecting portion 34 connects the end portions of the inner-side arrangement portion 31 and the outer-side arrangement portion 32 on the outer disk radial side and the forward disk rotation output side.

[0018] As in Fig. 4, the inside arrangement 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. Furthermore, the inside arrangement portion 31 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 inside of the disk 11 and all face the first braking surface 11a of the disk 11.

[0019] The first fixing portion 42 is provided on the forward disc rotation input side with respect to the second fixing portion 44 of the inner side arrangement portion 31. 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. In a state where the first fixing portion 42 and the second fixing portion 44 come into contact with a fixing portion (not shown) of the non-rotating portion of the vehicle, the fixing member 20 is fixed to the fixing portion by a screw (not shown) screwed into the screw holes 41 and 43.The first fixing portion 42 and the second fixing portion 44, which are fixed to the non-rotating portion of the vehicle, are aligned with each other in the disk axial direction and the disk radial direction. In this state, the main beam 45 overlaps the first fixing portion 42 and the second fixing portion 44 in the disk axial direction.

[0020] The first connecting portion 46 overlaps with the first fixing portion 42 in the disk axial direction and extends from the first fixing portion 42 toward the outer disk radial side. The second connecting portion 47 overlaps with the second fixing portion 44 in the disk axial direction and extends from the second fixing portion 44 toward the outer disk radial side. The first connecting portion 46 is arranged on the forward disk rotation input side with respect to the second connecting portion 47.

[0021] As in Fig. 2, the first connecting portion 33 extends from the end portion of the first connecting portion 46 on the outer disc radial side toward the outer side along the axial direction of the disc over the outer disc radial side with respect to the outer peripheral surface of the disc 11. The second connecting portion 34 extends from the end portion of the second connecting portion 47 on the outer disc radial side toward the outer side along the disc axial direction over the outer disc radial side with respect to the outer peripheral surface of the disc 11.

[0022] The outer side arrangement portion 32 has a third connecting portion 51 extending from the first connecting portion 33, a fourth connecting portion 52 extending from the second connecting portion 34, and an outer support portion 53 connecting the third connecting portion 51 and the fourth connecting portion 52. The third connecting portion 51, the fourth connecting portion 52, and the outer support portion 53 are all arranged on the outer side of the disk 11 and all face the second braking surface 11b of the disk 11.

[0023] The third connecting portion 51 extends from the end portion of the first connecting portion 33 on the outer side of the disk axial direction inward in the disk radial direction. The fourth connecting portion 52 extends from the end portion of the second connecting portion 34 on the outer side of the disk axial direction inward in the disk radial direction. The third connecting portion 51 is arranged on the forward disk rotation input side with respect to the fourth connecting portion 52. The outer support portion 53 connects the end portion of the third connecting portion 51 on the inner disk radial side and the end portion of the fourth connecting portion 52 on the inner disk radial side. The outer support 53 extends in the disk rotation direction.

[0024] A torque receiving portion 60 having a similar shape is provided on the inner disk rotation side of the first connecting portion 46 and the second connecting portion 47 shown in Fig. 4, and the third connecting section 51 and the fourth connecting section 52, shown in Fig. 5, formed. The torque receiving portion 60 of the first connecting portion 46 and the torque receiving portion 60 of the second connecting portion 47, which in Fig. 4 are arranged so that they are mirror-symmetrical in the disk rotation direction. The torque receiving section 60 of the third connecting section 51 and the torque receiving section 60 of the fourth connecting section 52, shown in Fig. 5, are arranged so that they are mirror-symmetrical in the disk rotation direction. In other words, the fastening element 20 has the torque-absorbing portions 60 on both sides in the disk rotation direction.

[0025] The torque receiving portions 60 formed at four positions and having the same shape are shown in Fig. 1. The torque receiving portions 60 of the third connecting portion 51 shown in Fig. 1 are shown in Fig. 1. Fig. 6. The torque receiving portion 60 includes a first surface portion 61, a second surface portion 62, a third surface portion 63 (torque receiving surface), a fourth surface portion 64, a fifth surface portion 65, a sixth surface portion 66, and a seventh surface portion 67, in order from the inner disk radial side. 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, the sixth surface portion 66, and the seventh surface portion 67 all extend along the disk axial direction.

[0026] The first surface section 61 has a curved surface shape and follows the disk radial direction. The second surface section 62 has a flat surface shape and extends from the outer disk radial side to the outer disk rotation side of the first section 61. The second surface section 62 extends substantially perpendicular to the radial reference line. The third surface section 63 has a flat surface shape and extends from the outer disk rotation side to the outer disk radial side of the second surface section 62. The third surface section 63 extends parallel to the radial reference plane. The fourth surface section 64 has a flat surface shape and extends from the outer disk radial side to the inner disk rotation side of the third surface section 63. The fourth surface section 64 extends perpendicular to the radial reference line.

[0027] The fifth surface section 65 has a flat surface shape and extends from the inner disk rotation side to the outer disk radial side of the fourth surface section 64. The fifth surface section 65 extends parallel to the radial reference plane. The sixth surface section 66 has a flat surface shape and extends from the outer disk radial side to the outer disk rotation side of the fifth surface section 65. The sixth surface section 66 extends perpendicular to the radial reference line. The seventh surface portion 67 has a flat surface shape and extends from the outer disk radial side to the outer disk radial side of the sixth surface portion 66. The seventh surface portion 67 extends parallel to the radial reference plane.

[0028] The first surface section 61, the third surface section 63, the fifth surface section 65, and the seventh surface section 67 face the inner disk rotation side. The second surface section 62 and the sixth surface section 66 face the outer disk radial side. The fourth surface section 64 faces the inner disk radial side.

[0029] The second surface portion 62, the third surface portion 63, and the fourth surface portion 64, which are connected to each other, form an engagement recess 75, which is recessed toward the outer disc rotation side from the first surface portion 61 and the fifth surface portion 65. In the torque receiving portion 60, the third surface portion 63 of the engagement recess 75 is a torque receiving surface that receives the braking torque of the second friction pad 27.

[0030] As in Fig. As shown in Figure 5, the torque-receiving portion 60 of the fourth connecting portion 52 has the engagement recess 75, which is mirror-symmetrical to the torque-receiving portion 60 of the third connecting portion 51. The engagement recess 75 of the third connecting portion 51 and the engagement recess 75 of the fourth connecting portion 52 face each other in the disk rotation direction and are recessed away from each other in the disk rotation direction. The engagement recess 75 of the third connecting portion 51 and the engagement recess 75 of the fourth connecting portion 52 are aligned with each other in the disk axial direction and also in the disk radial direction. The engagement recess 75 of the third connecting portion 51 penetrates the third connecting portion 51 in the disk axial direction. The engagement recess 75 of the fourth connecting portion 52 penetrates the fourth connecting portion 52 in the disk axial direction.

[0031] As in Fig. 4, the torque receiving section 60 of the first connecting section 46 has an engagement recess 75 which corresponds to the Fig. 5 shown torque receiving section 60 of the third connecting section 51. As in Fig. As shown in Figure 4, the torque-receiving portion 60 of the second connecting portion 47 has the engagement recess 75, which is mirror-symmetrical to the torque-receiving portion 60 of the first connecting portion 46. The engagement recess 75 of the first connecting portion 46 and the engagement recess 75 of the second connecting portion 47 face each other in the disk rotation direction and are recessed away from each other in the disk rotation direction. The engagement recess 75 of the first connecting portion 46 and the engagement recess 75 of the second connecting portion 47 are aligned with each other in the disk axial direction and also in the disk radial direction. The engagement recess 75 of the first connecting portion 46 penetrates the first connecting portion 46 in the disk axial direction. The engagement recess 75 of the second connecting portion 47 penetrates the second connecting portion 47 in the disk axial direction.

[0032] The engagement recess 75 of the Fig. 5 shown third connecting section 51 and the engagement recess 75 of the Fig. 4 are aligned in the disk radial direction and also aligned in the disk rotation direction. The engagement recess 75 of the Fig. 4 and the engagement recess 75 of the second connecting section 47 shown in Fig. 5 are aligned in the disk radial direction and also in the disk rotation direction.

[0033] As in Fig. 4, the fastening element 20 has the inside arrangement section 31, which carries the first friction lining 26, wherein the engagement recess 75 is provided in the first connecting section 46 and the engagement recess 75 is provided in the second connecting section 47. Furthermore, the fastening element 20, as shown in Fig. 5, the outer arrangement section 32, which carries the second friction lining 27, wherein the engagement recess 75 is provided in the third connecting section 51 and the engagement recess 75 in the fourth connecting section 52. In the fastening element 20, the first fixing section 42 and the Fig. 4 shown first connecting section 46 as well as the first connecting section 33 and the one in Fig. 5 is arranged on the forward disk rotation input side. In the fastening element 20, the second fixing section 44 and the second connecting section 47, shown in Fig. 4, as well as the second connecting section 34 and the fourth connecting section 52, shown in Fig. 5, located on the forward disk rotation output side.

[0034] The first pad spring 24 and the second pad spring 25 are both provided as one piece in the fastening element 20. As in Fig. 2, the first pad spring 24 is attached to the forward disc rotation input side of the fastening element 20. A first pad spring 24 is attached to the forward disc rotation input side via both the first connecting portion 46 and the third connecting portion 51. The second pad spring 25 is attached to the forward disc rotation output side of the fastening element 20. A second pad spring 25 is attached to the forward disc rotation output side via both the second connecting portion 47 and the fourth connecting portion 52. That is, two first and second pad springs 24 and 25 are attached to a fastening element 20. These first and second pad springs 24 and 25 are attached to the fastening element 20 and elastically support the first friction pad 26 and the second friction pad 27.Furthermore, the first pad spring 24 and the second pad spring 25 guide the movement of the first friction pad 26 and the second friction pad 27 in the disc axial direction.

[0035] Fig. 7 and Fig. 8 show the first pad spring 24 in a natural state before it is assembled with the fastening element 20.

[0036] As in Fig. As shown in Figure 7, the first pad spring 24 has a mirror-symmetrical shape. The first pad spring 24 is formed by pressing a single metal plate with a fixed thickness. The first pad spring 24 has a pair of pad support portions 101, a connecting portion 102 connecting these pad support portions 101 to each other, and an engaging portion 103 extending from the connecting portion 102. As shown in Fig. 2, in the first pad spring 24, the two pad support portions 101 are arranged on both sides of the disc 11 in the disc axial direction. In the first pad spring 24, the connecting portion 102 is arranged on the outer disc radial side of the disc 11. In other words, in the first pad spring 24, the disc 11 is arranged between the pair of pad support portions 101.

[0037] As in Fig. As shown in Figure 7, in the first pad spring 24, the pair of pad support portions 101 has a mirror-symmetrical shape. Therefore, one pad support portion 101 will be described.

[0038] The pad support portion 101 includes an outer end portion 110, an outer plate portion 111, an outer support plate portion 112, a wall plate portion 113 (elastic plate portion), an extension plate portion 114, an inner plate portion 115, and an engagement claw 116. The outer end plate portion 110, the outer plate portion 111, the outer support plate portion 112, the extension plate portion 114, the inner plate portion 115, and the engagement claw 116 all have a flat plate shape.

[0039] The outer end plate portion 110 is located at the end portion of the pad support portion 101 on the side of the connecting portion 102. The outer plate portion 111 extends from the side opposite the connecting portion 102 in the outer end plate portion 110 toward the side opposite the connecting portion 102 substantially perpendicular to the outer end plate portion 110.

[0040] The outer support plate portion 112 extends from the side opposite the outer end portion 110 in the outer plate portion 111 substantially perpendicular to the outer plate portion 111. The outer support plate portion 112 extends from the outer plate portion 111 on the same side as the outer end plate portion 110 in the thickness direction of the outer plate portion 111.

[0041] The wall plate portion 113 extends from the side opposite the outer plate portion 111 in the outer support plate portion 112 substantially perpendicular to the outer support plate portion 112. The wall plate portion 113 extends from the outer support plate portion 112 toward the side opposite the outer plate portion 111 in the direction of the thickness of the outer support plate portion 112.

[0042] As in Fig. 8, the wall plate portion 113 has a curved plate shape that is curved in the thickness direction. The wall plate portion 113 is convexly curved toward the side in which the outer support plate portion 112 extends from the wall plate portion 113 in the thickness direction of the wall plate portion 113. That is, as shown in Fig. As shown in Figure 9, the wall plate portion 113 has a curved surface portion 117 that is curved with a radius R greater than zero on the side of the outer support plate portion 112 in the thickness direction of the wall plate portion 113. Furthermore, the wall plate portion 113 has a curved surface portion 118 that is also curved with a radius greater than zero on the side opposite the outer support plate portion 112 in the thickness direction of the wall plate portion 113.

[0043] The extension plate portion 114 extends from the side opposite the outer support plate portion 112 in the wall plate portion 113 substantially perpendicular to the wall plate portion 113. The extension plate portion 114 extends from the wall plate portion 113 on the same side as the outer support plate portion 112 in the direction of the thickness of the wall plate portion 113. As shown in Fig. As shown in Figure 7, the extension plate portion 114 is provided with an intermediate opening 119. The intermediate opening 119 penetrates a predetermined area on the wall plate portion 113 side in the extension plate portion 114 in the thickness direction of the extension plate portion 114.

[0044] The inner plate portion 115 extends from the side opposite the wall plate portion 113 in the extension plate portion 114 substantially perpendicular to the extension plate portion 114. The inner plate portion 115 extends from the extension plate portion 114 toward the side opposite the wall plate portion 113 in the direction of the thickness of the extension plate portion 114.

[0045] The engaging claw 116 protrudes from the wall plate portion 113 toward the side opposite the outer support plate portion 112 relative to the extension plate portion 114 through the intermediate opening 119. The engaging claw 116 protrudes from the wall plate portion 113 at an obtuse angle relative to the wall plate portion 113. The engaging claw 116 protrudes on the same side as the extension plate portion 114 in the direction of the thickness of the wall plate portion 113.

[0046] The boundary line between the outer end plate portion 110 and the outer plate portion 111, the boundary line between the outer plate portion 111 and the outer support plate portion 112, the boundary line between the outer support plate portion 112 and the wall plate portion 113, the boundary line between the wall plate portion 113 and the extension plate portion 114, and the boundary line between the extension plate portion 114 and the inner plate portion 115 are parallel to each other. The wall plate portion 113 is curved about an axis parallel to these boundary lines. The outer plate portion 111 and the wall portion 113 extend substantially parallel to each other. As shown in Fig. 8, the extension plate portion 114 spreads at a slight inclination relative to the outer support plate portion 112 to move away from the outer support plate portion 112 while moving away from the wall plate portion 113.

[0047] The outer end plate portion 110, the outer support plate portion 112, and the extension plate portion 114 extend substantially parallel to each other. The outer plate portion 111, the wall plate portion 113, and the inner plate portion 115 extend substantially parallel to each other.

[0048] The outer support plate portion 112, the wall plate portion 113, and the extension plate portion 114, which are continuously connected to each other, are connected to form a concave shape with respect to the outer plate portion 111 and the inner plate portion 115 as a whole, thereby forming a guide recess 120 (second support plate portion).

[0049] The pad support portion 101 includes a spring plate portion 121 (third support portion). The spring plate portion 121 extends from the edge portion of the extension plate portion 114 of the pad support portion 101 on the side opposite to the other pad support portion 101 toward the side opposite to the other pad support portion 101, and then folds back toward the outer support plate portion 112 in the thickness direction of the extension plate portion 114 to extend toward the other pad support portion 101.

[0050] The spring plate portion 121 has a curved plate portion 122 and an inner support plate portion 123. The curved plate portion 122 is curved into a substantially cylindrical shape. In one pad support portion 101, the curved plate portion 122 extends from the edge portion on the opposite side to the other pad support portion 101 into the extension plate portion 114. In one pad support portion 101, the curved plate portion 122 extends from the extension plate portion 114 in a direction away from the other pad support portion 101 while approaching the outer support plate portion 112 in the thickness direction of the extension plate portion 114. Then, the curved plate portion 122 extends toward the other pad support portion 101 while approaching the outer support plate portion 112 in the thickness direction of the extension plate portion 114.Then, the curved plate portion 122 extends toward the other pad support portion 101 while moving away from the outer support plate portion 112 in the direction of the thickness of the extension plate portion 114.

[0051] In one pad support portion 101, the inner support plate portion 123 extends linearly from the edge portion on the side opposite the edge portion continuous with the extension plate portion 114 in the curved plate portion 122 toward the other pad support portion 101. In one pad support portion 101, the inner support plate portion 123 extends from the curved plate portion 122 in the thickness direction of the extension plate portion 114 as it moves toward the other pad support portion 101, so that it is away from the extension plate portion 114. The spring plate portion 121 is elastically deformed mainly in the curved plate portion 122.

[0052] The flooring support portion 101 includes a spring plate portion 131 (first support portion). The spring plate portion 131 extends from the edge portion on the opposite side of the outer plate portion 111 of the support plate portion 101 toward the opposite side of the other support plate portion 101, is folded back toward the opposite side of the wall plate portion 113 in the direction of the thickness of the outer plate portion 111, and extends toward the other support plate portion 101.

[0053] The spring plate portion 131 has a curved plate portion 132 and a support plate portion 133. The curved plate portion 132 is curved in a substantially cylindrical shape. In one pad support portion 101, the curved plate portion 132 extends into the outer plate portion 111 from the edge portion on the opposite side to the other pad support portion 101. In one pad support portion 101, the curved plate portion 132 extends from the outer plate portion 111 in a direction away from the other pad support portion 101, while extending on the same side as the outer support plate portion 112 in the thickness direction of the outer plate portion 111.Then, the curved plate portion 132 extends in a direction away from the other pad support portion 101 while extending in a direction opposite to the outer support plate portion 112 in the thickness direction of the outer plate portion 111. Then, the curved plate portion 132 extends in a direction toward the other pad support portion 101 while extending in a direction opposite to the outer support plate portion 112 in the thickness direction of the outer plate portion 111.

[0054] In one pad support section 101, the support plate section 133 extends from the edge portion on the side opposite the edge portion continuous with the outer plate section 111 in the curved plate section 132 toward the other pad support section 101. In one pad support section 101, the support plate section 133 extends from the curved plate section 132 in a direction away from the outer plate section 111 in the thickness direction of the outer plate section 111 as it moves toward the other pad support section 101. In one pad support section 101, the support plate section 133 is arcuately curved, centered on an axis located on the side opposite the outer plate section 111 in the thickness direction of the support plate section 133, and extends perpendicular to the outer support plate section 112.

[0055] The first pad spring 24 has a pair of the pad support portions 101 described above, which are arranged in a mirror-symmetrical shape.

[0056] The connecting portion 102 has a base end connecting plate portion 141, an intermediate connecting plate portion 142, and a tip connecting plate portion 143. The base end connecting plate portion 141, the intermediate connecting plate portion 142, and the tip connecting plate portion 143 all have a flat plate shape.

[0057] The base end connecting plate portion 141 is arranged on the same plane as the outer end plate portions 110 of the pair of pad support portions 101 to connect them. The base end connecting plate portion 141 connects the edge portions of the pair of outer end plate portions 110 on the opposite side to the outer plate portion 111.

[0058] The intermediate connecting plate portion 142 extends from the edge portion of the base end connecting plate portion 141 on the side opposite to the pair of outer end plate portions 110 toward the side opposite to the pair of outer plate portions 111 in the thickness direction of the base end connecting plate portion 141.

[0059] The tip connecting plate portion 143 extends from the edge portion on the side opposite to the base end connecting plate portion 141 in the intermediate connecting plate portion 142 toward the side opposite to the base end connecting plate portion 141 in the thickness direction of the intermediate connecting plate portion 142. The tip connecting plate portion 143 extends so as to be away from the base end connecting plate portion 141 in the thickness direction of the base end connecting plate portion 141 as it moves away from the intermediate connecting plate portion 142.

[0060] The engaging portion 103 has a base portion 145 and a pair of engaging projection portions 146. The base plate portion 135 extends from a position between the pair of outer end plate portions 110 of the base end connecting plate portion 141 in a direction away from the base end connecting plate portion 141 in the thickness direction of the intermediate connecting plate portion 142, and is folded back to the side opposite the intermediate connecting plate portion 142 in the thickness direction of the base end connecting plate portion 141. Then, the base plate portion 135 moves away from the pair of outer plate portions 111 in the thickness direction of the intermediate connecting plate portion 142 and extends away from the intermediate connecting plate portion 142 in the thickness direction of the base end connecting plate portion 141.

[0061] The pair of engaging projection portions 146 are provided at the end portion opposite the base end connecting plate portion 141 in the base plate portion 145. One engaging projection portion 146 protrudes from the edge portion on the side of one outer end plate portion 110 in the base portion 145, and the other engaging projection portion 146 protrudes from the edge portion on the side of the other outer end plate portion 110 in the base portion 145. The pair of engaging projection portions 146 protrude toward the side opposite the base end connecting plate portion 141 in the thickness direction of the base plate portion 145. The gap between the pair of engaging projection portions 146 becomes wider as it moves away from the base portion 145.

[0062] The boundary line between the base end connecting plate portion 141 and the intermediate connecting plate portion 142, the boundary line between the intermediate connecting plate portion 142 and the tip connecting plate portion 143, and the boundary line between the base end connecting plate portion 141 and the base plate portion 145 are parallel to the boundary line between the outer end plate portion 110 and the outer plate portion 111.

[0063] Fig. Figure 10 shows the second pad spring 25 in a natural state before it is mounted to the fastening element 20. The second pad spring 25 differs in part from the first pad spring 24 shown in Fig. 7 and Fig. 8 is shown.

[0064] The second pad spring 25 has a mirror-symmetrical shape. The second pad spring 25 is formed by pressing a single metal plate with a fixed thickness. The second pad spring 25 has, instead of the pair of pad support portions 101, a pair of pad support portions 101A, which are partially different from the pair of pad support portions 101. Furthermore, the second pad spring 25 does not have either of the two Fig. 7 shown spring plate sections 131.

[0065] As in Fig. As shown in Figure 10, the pad support portion 101A has a guide recess 120A instead of the guide recess 120, which is partially different from the guide recess 120. The guide recess 120A has a wall plate portion 113A instead of the wall portion 113, which is partially different from the wall plate portion 113. The wall plate portion 113A has a flat plate shape extending substantially perpendicular to the outer support plate portion 112 and the extension plate portion 114. That is, the wall plate portion 113A has a flat surface portion 117A on the outer support plate portion 112 side in the thickness direction of the wall plate portion 113A. Furthermore, the wall plate portion 113A also has a flat surface portion 118A on the side opposite to the outer support plate portion 112 in the thickness direction of the wall plate portion 113A.

[0066] Apart from that, the second pad spring 25 has the same design as the first pad spring 24, which in Fig. 7 and Fig. 8 is shown.

[0067] As in Fig. 2, the first pad spring 24 is attached to the first connecting portion 46 and the third connecting portion 51, both located on the forward disc rotation input side of the fastening element 20. At this time, the first pad spring 24 is in a state in which the connecting portion 102 is located on the outer disc radial side with respect to the pad support portion 101. Furthermore, at this time, the first pad spring 24 fits the guide recess 120 of one pad support portion 101 into the engagement recess 75 of the third connecting portion 51, as shown in Fig. 5, and fits the guide recess 120 of the other pad support portion 101 into the engagement recess 75 of the first connecting portion 46, as shown in Fig. 4. Accordingly, the first pad spring 24 is provided in the fastening element 20 to restrict the movement in the disk radial direction and in the direction of the forward disk rotation input side. Furthermore, at this time, as shown in Fig. 3, the first pad spring 24 brings one engaging projection portion 146 of the engaging portion 103 into contact with the surface on the third connecting portion 51 side in the first connecting portion 46 and brings the other engaging projection portion 146 into contact with the surface on the first connecting portion 46 side in the third connecting portion 51. Accordingly, the first pad spring 24 is provided in the fastening member 20 to restrict movement in the disk axial direction. In other words, the first pad spring 24 is positioned and fixed to the fastening member 20 in the disk radial direction, the disk rotation direction, and the disk axial direction.

[0068] Accordingly, the first pad spring 24 is located as shown in Fig. 2, in a state in which the pair of pad support portions 101 are arranged on both surfaces of the disc 11 in the disc axial direction. Furthermore, in this state, the first pad spring 24 is in a state in which the guide recess 120 and the spring plate portion 121 of the one in Fig. 4 are arranged within the engagement recess 75 of the first connecting portion 46 of the fastening element 20 and the guide recess 120 and the spring plate portion 121 of the other in Fig. 5 are arranged within the engagement recess 75 of the third connecting portion 51 of the fastening element 20.

[0069] In this way, when the first pad spring 24 provided on the forward disk rotation input side is attached to the first connecting portion 46 and the third connecting portion 51, the two guide recesses 120 engaging with the two engagement recesses 75 are recessed outward in the disk rotation direction.

[0070] When the first pad spring 24 is attached to the fastening element 20, the pad support section 101 on the outer side, shown in Fig. 5, into the torque receiving section 60 of the third connecting section 51, and the inner lining support section 101, shown in Fig. 4, engages the torque receiving portion 60 of the first connecting portion 46. The first pad spring 24 is in the engagement state between the pad support portion 101 of the outer side and the torque receiving portion 60 of the third connecting portion 51, which is in Fig. 5, and the engagement state between the inner side pad support portion 101 shown in Fig. 4, and the torque receiving portion 60 of the first connecting portion 46. Therefore, the engagement state between the outer pad support portion 101 of the first pad spring 24 and the third connecting portion 51 will be described below mainly with reference to Fig. 6 described.

[0071] In the outer pad support portion 101 of the first pad spring 24, the wall plate portion 113 of the guide recess 120 is disposed on the outer side of the disk rotation direction in the guide recess 120. At this time, the wall plate portion 113 of the guide recess 120 faces the third surface portion 63 on the back side of the recess of the engagement recess 75 and comes into contact with the third surface portion 63. In this state, the wall portion 113 expands substantially parallel to the radial reference plane as in the third surface portion 63. The wall plate portion 113 is curved as described above so that the outer end portion in the disk radial direction comes into contact with the third surface portion 63, and the intermediate portion in the disk radial direction is separated from the third surface portion 63 in the disk rotation direction.The inner end portion of the wall plate portion 113 in the disk radial direction has a small gap formed between the inner end portion and the third surface portion 63 so as to be smaller than the intermediate portion in the disk radial direction.

[0072] Furthermore, in the outer pad support portion 101 of the first pad spring 24, the outer support plate portion 112 of the guide recess 120 is disposed on the outer disc radial side of the guide recess 120. At this time, the outer support plate portion 112 of the guide recess 120 faces the fourth surface portion 64 on the outer disc radial side of the engagement recess 75 and comes into surface contact with the fourth surface portion 64. At this time, the outer support plate portion 112 extends perpendicular to the radial reference line along the disc axis, as in the fourth surface portion 64.

[0073] Furthermore, in the outer pad support portion 101 of the first pad spring 24, the extension plate portion 114 of the guide recess 120 is disposed on the inner disk radial side of the guide recess 120. At this time, the extension plate portion 114 of the guide recess 120 faces the second surface portion 62 on the radially inner disk side of the engagement recess 75 and comes into surface contact with the second surface portion 62. In this state, the extension plate portion 114 expands perpendicular to the radial reference line along the disk axial direction as in the second surface portion 62.

[0074] Furthermore, in the outer pad support section 101 of the first pad spring 24, the Fig. 7 is arranged on the inner disk radial side of the guide recess 120. In this state, the engagement claw 116 comes into contact with the second surface portion 62 of the Fig. 6, in order to be elastically deformed outwards in the radial direction of the disc.

[0075] Further, in the outer pad support portion 101 of the first pad spring 24, the inner surface portion 115 extends from the extension plate portion 114 toward the inner disk radial side and faces the first surface portion 61 in the disk rotation direction.

[0076] Further, in the outer pad support portion 101 of the first pad spring 24, the outer plate portion 111 extends from the outer support plate portion 112 toward the outer disk radial side and faces the fifth surface portion 65 in the disk rotation direction.

[0077] As described above, in the outer pad support portion 101 of the first pad spring 24, the guide recess 120 is connected to the engagement recess 75. At this time, the pad support portion 101 comes into contact with the engagement recess 75 in the outer support plate portion 112, the wall plate portion 113, the extension plate portion 114, and the engagement claw 116.

[0078] In the outer pad support portion 101 of the first pad spring 24, the outer support plate portion 112 extends inward in the disk rotation direction from the edge portion of the wall plate portion 113 on the outer disk radial side, and the extension plate portion 114 extends inward in the disk rotation direction from the edge portion of the wall plate portion 113 on the inner disk radial side. The outer support plate portion 112, the wall plate portion 113, and the extension plate portion 114 all extend in the disk axial direction.

[0079] Furthermore, in the outer pad support portion 101 of the first pad spring 24, the curved plate portion 122 of the spring plate portion 121 is provided on the side opposite the disk 11 in the extension plate portion 114 in the disk axial direction. The curved plate portion 122 extends from the extension plate portion 114 toward the side opposite the disk 11 and is then folded back toward the outer disk radial side. Then, the inner support plate portion 123 (shown in Fig. 7) of the spring plate portion 121 from the curved plate portion 122 to approach the disk 11 in the disk axial direction.

[0080] Furthermore, in the outer pad support portion 101 of the first pad spring 24, the curved plate portion 132 of the spring plate portion 131 is provided on the side opposite the disk 11 in the outer plate portion 111 in the disk axial direction. The curved plate portion 132 extends from the outer plate portion 111 toward the side opposite the disk 11 and is then folded back toward the inner disk rotation side. Then, the Fig. 7, the support plate portion 133 of the spring plate portion 131 deviates from the curved plate portion 132 to approach the disk 11 in the disk axial direction.

[0081] As in Fig. 6, in the outer pad support portion 101 of the first pad spring 24, the wall plate portion 113 covers the third surface portion 63 of the torque receiving portion 60 of the third connecting portion 51. In the outer pad support section 101 of the first pad spring 24, the wall plate section 113 is offset relative to the spring plate section 131 in the disc radial direction, in particular offset relative to the spring plate section 131 in the direction of the inner disc radial side.

[0082] In the first pad spring 24, which is attached to the fastening element 20, the Fig. 4, the inner lining support section 101 is inserted into the torque receiving section 60 of the first connecting section 46, similar to the outer lining support section 101 which is inserted into the torque receiving section 60 of the Fig. 6 shown third connecting section 51.

[0083] When the first pad spring 24 is attached to the fastening element 20, the intermediate connecting plate portion 142 and the tip connecting plate portion 143 of the connecting portion 102 extend from the Fig. 7, the edge portion of the base end connecting plate portion 141 on the side opposite the pair of outer end plate portions 110 toward the outer disk radial side. In the fastening state, as shown in Fig. 6, the intermediate connecting plate portion 142 faces the seventh surface portion 67 in the disk rotation direction.

[0084] As in Fig. 2, the second pad spring 25 is attached to the second connecting portion 47 and the fourth connecting portion 52, both located on the forward disc rotation output side of the fastening member 20, substantially similar to the first pad spring 24, which is attached to the first connecting portion 46 and the third connecting portion 51.

[0085] In the second pad spring 25, which is attached to the fastening element 20, the Fig. 5 engages the torque receiving portion 60 of the fourth connecting portion 52. Furthermore, the second pad spring 25, which is in the fastening state, engages the Fig. 4 into the torque receiving portion 60 of the second connecting portion 47.

[0086] At this time, however, in the second pad spring 25, the outer wall plate portion 113A having a flat plate shape comes into surface contact with the third surface portion 63 of the fourth connecting portion 52, as shown in Fig. 5, and the inner wall portion 113A having a flat plate shape comes into surface contact with the third surface portion 63 of the second connecting portion 47, as shown in Fig. 4 shown.

[0087] In this way, the first pad spring 24 and the second pad spring 25 face each other in the disc rotation direction, while they are separated from each other in the disc rotation direction and are fastened to the fastening element 20.

[0088] The Fig. 4 shown first friction lining 26 and the one in Fig. 5, the second friction lining 27 engages the first lining spring 24 and the second lining spring 25, which are attached to the fastening element 20. As shown in Fig. 4, the first friction lining 26 is supported by the first connecting portion 46 and the second connecting portion 47 of the fastening element 20 via the first lining spring 24 and the second lining spring 25. As shown in Fig. As shown in Figure 5, the second friction lining 27 is supported by the third connecting portion 51 and the fourth connecting portion 52 of the fastening element 20 via the first lining spring 24 and the second lining spring 25. The first friction lining 26 and the second friction lining 27 each have a longitudinal direction aligned with the disc rotation direction.

[0089] In the Fig. 4 shown first friction lining 26 on the inner side and the one in Fig. The second friction lining 27 on the outer side shown in Figure 5 are components that essentially have the same shape.

[0090] As in Fig. 2, the first friction pad 26 has a back plate 171. The second friction pad 27 has a back plate 172. The first friction pad 26 and the second friction pad 27 each have a pad 173 having a common shape. The pad 173 is fixed to one surface side of each of the back plates 171 and 172 in the thickness direction. The first friction pad 26 has a longitudinal direction that coincides with the longitudinal direction of the back plate 171. The second friction pad 27 has a longitudinal direction that coincides with the longitudinal direction of the back plate 172. In the first friction pad 26, the back plate 171 is supported by the fixing member 20 via the first pad spring 24 and the second pad spring 25, while the pad 173 faces the disk 11. In the second friction lining 27, the back plate 172 is supported by the fastening element 20 via the first lining spring 24 and the second lining spring 25, while the lining 173 faces the disc 11.

[0091] The back plate 171 of the first friction lining 26 has a mirror-symmetrical shape. As shown in Fig. 4, the back plate 171 has a main plate portion 175 and a pair of projection portions 176. The main body portion 175 is provided in the center of the back plate 171 in the longitudinal direction. The main body portion 175 is long in the longitudinal direction of the back plate 171. As shown in Fig. As shown in Figure 2, the covering 173 is attached to the main body portion 175. The covering 173 also has a mirror-symmetrical shape.

[0092] As in Fig. As shown in Figure 4, the main body portion 175 is provided with a pair of mounting holes 181 located on both sides in the longitudinal direction to penetrate the main body portion 175 in the thickness direction. The pair of mounting holes 181 are formed at locations on the main body portion 175 where the lining 173 is not attached. A wear sensor 183 is attached to a predetermined mounting hole of the pair of holes 181 with a rivet 182. The wear sensor 183 is attached to the surface of the main body portion 175 on the side opposite to the pad 173 in the thickness direction and extends through the outside of the main body portion 175 toward the pad 173 relative to the surface on the pad 173 side in the thickness direction of the main body portion 175. The main body portion 175 has a pair of end surfaces 184 at both end portions in the longitudinal direction.The two end surfaces 184 are parallel to each other.

[0093] In the back plate 171, the two protrusion portions 176 also have a mirror-symmetrical shape. One protrusion portion 176 is provided at one longitudinal end portion of the back plate 171. The other protrusion portion 176 is provided at the other longitudinal end portion of the back plate 171. One protrusion portion 176 of the pair of protrusion portions 176 protrudes longitudinally outward from one end surface 184 of the main body portion 175 along the longitudinal direction of the main body portion 175, and the other protrusion portion 176 of the pair of protrusion portions 176 protrudes longitudinally outward from the other end surface 184 of the main body portion 175 along the longitudinal direction of the main body portion 175.Thus, the pair of protrusion portions 176 protrude from both end portions of the main body portion 175 in the longitudinal direction in the opposite directions along the longitudinal direction of the main body portion 175.

[0094] The back plate 172 of the Fig. The second friction pad 27 shown in Figure 5 has a main body portion 185 that partially differs from the main body portion 175. The main body portion 185 differs from the main body portion 175 in that the pair of mounting holes 181 are not formed therein. The back plate 172 has a pair of projection portions 176 similar to the back plate 171.

[0095] The projection portion 176 on the forward disk rotation input side of the Fig. 4 has the same shape as the projection portion 176 on the forward disc rotation output side of the first friction lining 26 shown in Fig. 5, and the projection portion 176 on the forward disc rotation output side of the second friction lining 27 shown in Fig. 4 has the same shape as the projection portion 176 on the forward disc rotation input side of the first friction lining 26 shown in Fig. 5. Therefore, the projection portion 176 on the forward disc rotation input side of the second friction lining 27 will be described as an example mainly with reference to Fig. 6 described.

[0096] The protrusion portion 176 on the forward disc rotation input side of the second friction pad 27 has an inner surface portion 191, an outer surface portion 192, and a tip surface portion 193. The inner surface portion 191, the outer surface portion 192, and the tip surface portion 193 all have a flat surface shape and all extend along the thickness direction of the back plate 171.

[0097] The inner surface portion 191 and the outer surface portion 192 both extend from the main body portion 185 along the longitudinal direction of the back plate 171. The outer surface portion 192 extends from one end side of the end surface 184 of the main body portion 185. The outer surface portion 192 is parallel to the inner surface portion 191 and faces the side opposite the inner surface portion 191. The tip surface portion 193 is an end portion on the side opposite the main body portion 185 in the longitudinal direction of the back plate 171. The tip surface portion 193 extends perpendicular to the inner surface portion 191 and the outer surface portion 192. The protrusion portion 176 is provided with a fastening opening 194 penetrating the protrusion portion 176 in the thickness direction. As shown in Fig. 5, a return spring 196 is attached to the mounting hole 194 by a rivet 195. As shown in Fig. 2, the return spring 196 is fixed to the surface on the side opposite the pad 173 in the thickness direction of the projection portion 176.

[0098] As in Fig. 5, the protrusion portion 176 on the forward disc rotation input side of the second friction pad 27 engages with the outer pad support portion 101, which is fixed to the third connecting portion 51 of the first pad spring 24. The protrusion portion 176 on the forward disc rotation output side of the second friction pad 27 engages with the outer pad support portion 101A, which is fixed to the fourth connecting portion 52 of the second pad spring 25. Accordingly, the second friction pad 27 has a longitudinal direction aligned with the disc rotation direction.

[0099] When the second friction pad 27 is fixed to the fixing member 20 via the first pad spring 24 and the second pad spring 25, the projection portion 176 on the forward disc rotation input side of the second friction pad 27 comes into contact with the inner support plate portion 123 (shown in Fig. 7) of the outer pad support portion 121 of the first pad spring 24 in the inner surface portion 191 on the inner disc radial side, elastically deforms the inner pad support portion 123 inward in the disc radial direction to approach the extension plate portion 114, and is inserted into the outer guide recess 120 (shown in Fig. 5) of the first pad spring 24. At this time, the main body portion 185 of the second friction pad 27 in the end surface 184 on the forward disc rotation input side comes into contact with the end plate portion 133 (in Fig. 7) of the outer pad support portion 131 of the first pad spring 24 and elastically deforms the end plate portion 133 outward in the disc rotation direction to approach the outer plate portion 111. Further, at this time, the projection 176 on the forward disc rotation output side of the Fig. 5 shown second friction lining 27 in contact with the inner support plate portion 123 (see Fig. 10) of the outer spring plate portion 121 of the second pad spring 25 in the inner surface portion 191 on the inner disc radial side, elastically deforms the inner support plate portion 123 inward in the disc radial direction to approach the extension plate portion 114, and is inserted into the guide recess 120A arranged in the fourth connecting portion 52, as shown in Fig. 5 shown.

[0100] As described above, in the second friction pad 27, the protrusion portion 176 on the forward disc rotation input side is inserted into the engaging recess 75 of the third connecting portion 51 of the fastening member 20 and supported by the third connecting portion 51. Furthermore, in the second friction pad 27, the protrusion portion 176 on the forward disc rotation output side is inserted into the engaging recess 75 of the fourth connecting portion 52 of the fastening member 20 and supported by the fourth connecting portion 52.

[0101] In this state, the protrusion portion 176 on the forward disc rotation input side of the second friction pad 27 is pushed outward in the disc radial direction by the biasing force of the outer spring plate portion 121 of the first pad spring 24. In other words, the outer spring plate portion 121 of the first pad spring 24 elastically supports the second friction pad 27 in the disc radial direction.

[0102] Furthermore, in this state, the main body portion 185 of the second friction pad 27 is pressed toward the forward disc rotation output side by the biasing force of the outer spring plate portion 131 of the first pad spring 24. In other words, the outer spring plate portion 131 of the first pad spring 24 elastically supports the second friction pad 27 in the disc rotation direction.

[0103] Furthermore, in this state, the protrusion portion 176 on the forward disc rotation output side of the second friction pad 27 is pushed outward in the disc radial direction by the biasing force of the outer spring plate portion 121 of the second pad spring 25. In other words, the outer spring plate portion 121 of the second pad spring 25 elastically supports the second friction pad 27 in the disc radial direction.

[0104] As described above, the second friction pad 27 is biased outward in the disk radial direction by the biasing force of the outer spring plate portion 121 of the first pad spring 24 and the outer spring plate portion 121 of the second pad spring 25. When the second friction pad 27 is thus biased in a state without any input from the disk 11, the projection portion 176 on the forward disk rotation input side comes into surface contact with the outer support plate portion 112 of the outer guide recess 120 of the first pad spring 24 in the outer surface portion 192 in a pressed state.

[0105] Further, in this state, the projection portion 176 on the forward disc rotation output side of the second friction pad 27 comes into surface contact with the outer support plate portion 112 of the outer guide recess 120 of the second pad spring 25 in the outer surface portion 192.

[0106] Further, in this state, the projection portion 176 on the forward disc rotation input side of the second friction pad 27 is supported by the outer guide recess 120 of the first pad spring 24 to be movable in the disc axial direction.

[0107] Further, in this state, the projection portion 176 on the forward disc rotation output side of the second friction pad 27 is supported by the outer guide recess 120 of the second pad spring 25 to be movable in the disc axial direction.

[0108] When the second friction pad 27 is biased toward the forward disk rotation output side by the biasing force of the outer spring plate portion 131 of the first pad spring 24 in a state without any input from the disk 11, the protrusion portion 176 on the forward disk rotation output side comes into surface contact with the wall plate portion 113A of the outer guide recess 120A of the second pad spring 25 in the tip surface portion 193 at the outer end of the disk rotation direction.

[0109] Furthermore, the second friction lining 27 is in this state, as in Fig. 6, in a state where the tip surface portion 193 of the protrusion portion 176 on the forward disk rotation input side does not contact the wall plate portion 113 of the outer guide groove 120 of the first pad spring 24 and has a gap S between the tip surface portion and the wall plate portion 113 in the disk rotation direction.

[0110] The outer guide recess 120 of the first pad spring 24 includes the wall plate portion 113, which is curved from the third surface portion 63 of the torque-absorbing portion 60 of the third connecting portion 51 toward the second friction pad 27. This wall plate portion 113 also elastically supports the second friction pad 27 in the disk rotation direction when the tip surface portion 193 of the protrusion portion 176 on the forward disk rotation input side of the second friction pad 27 comes into contact with the wall plate portion. Here, in the spring plate portion 131 and the wall plate portion 113 on the outer side of each of the first pad springs 24, the spring constant of the spring plate portion 131 is smaller than the spring constant of the wall plate portion 113.

[0111] As in Fig. 11, in the disc brake 10, the above-described state is a first state in which one of the spring plate portions 131 and the wall plate portion 113 on the outer side of each of the first pad springs 24 comes into contact with the second friction pad 27, and the other has a gap S between the other and the second friction pad 27. In the first pad spring 24, the outer spring plate portion 131 is arranged on the outer disc radial side with respect to the outer wall plate portion 113. This first state is a state in which the second friction pad 27 has the gap S between the second friction pad and the outer wall plate portion 113 of the first pad spring 24 by supporting the spring plate portion 131 on the outer side of the first pad spring 24.

[0112] The first pad spring 24 has the spring plate portion 121 provided on the outer side to contact the second friction pad 27 and support the second friction pad 27 on the outer disc radial side. When the vehicle decelerates in the reverse direction, the apex of the curve of the outer wall plate portion 113 of the first pad spring 24 comes into contact with the center of the projection portion 176 on the reverse disc rotation output side of the second friction pad 27 in the direction of the disc radial reference line.

[0113] As in Fig. As shown in Figure 4, the protrusion portion 176 on the forward disc rotation input side of the first friction pad 26 engages with the inner pad support portion 101, which is fixed to the first connecting portion 46 of the first pad spring 24. The protrusion portion 176 on the forward disc rotation output side of the first friction pad 26 engages with the inner pad support portion 101A, which is fixed to the second connecting portion 47 of the second pad spring 25. Accordingly, the first friction pad 26 has a longitudinal direction aligned with the disc rotation direction.

[0114] Here, when the first friction pad 26 is fixed to the fixing member 20 via the first pad spring 24 and the second pad spring 25, as in the second friction pad 27, the projection portion 176 on the forward disc rotation input side of the first friction pad 26 comes into contact with the inner support plate portion 123 (shown in Fig. 7) the inner spring plate portion 121 of the first pad spring 24 in the inner surface portion 191 on the inner disc radial side, elastically deforms the inner pad plate portion 123 to approach the extension plate portion 114, and is inserted into the guide recess 120 of the Fig. 4 is introduced. At this time, the main body portion 175 of the first friction lining 26 comes into contact with the (in Fig. 7) inner pad support portion 133 of the inner spring plate portion 131 of the first pad spring 24 in the end surface 184 on the forward disc rotation input side and elastically deforms the pad support portion 133 outward in the disc rotation direction to approach the outer plate portion 111. Further, at this time, the projection portion 176 on the forward disc rotation output side of the Fig. 4 shown first friction lining 26 with the inner lining support section 123 (in Fig. 10) of the inner spring plate portion 121 of the second pad spring 25 in the inner surface portion 191 on the inner disc radial side, elastically deforms the inner pad support portion 123 to approach the extension plate portion 114, and is inserted into the guide recess 120A of the second connecting portion 47.

[0115] As described above, in the first friction pad 26, the protrusion portion 176 on the forward disc rotation input side is inserted into the engaging recess 75 of the first connecting portion 46 of the fastening member 20 and supported by the first connecting portion 46. Furthermore, in the first friction pad 26, the protrusion portion 176 on the forward disc rotation output side is inserted into the engaging recess 75 of the second connecting portion 47 of the fastening member 20 and supported by the second connecting portion 47.

[0116] In this state, the protrusion portion 176 on the forward disc rotation input side of the first friction pad 26 is pushed outward in the disc radial direction by the biasing force of the inner spring plate portion 121 of the first pad spring 24. In other words, the inner spring plate portion 121 of the first pad spring 24 elastically supports the first friction pad 26 in the disc radial direction.

[0117] Furthermore, in this state, the main body portion 175 of the first friction pad 26 is pressed toward the forward disc rotation output side by the biasing force of the inner spring plate portion 131 of the first pad spring 24. In other words, the inner spring plate portion 131 of the first pad spring 24 elastically supports the first friction pad 26 in the disc rotation direction.

[0118] Furthermore, in this state, the protrusion portion 176 on the forward disc rotation output side of the first friction pad 26 is pushed outward in the disc radial direction by the biasing force of the inner spring plate portion 121 of the second pad spring 25. In other words, the inner spring plate portion 121 of the second pad spring 25 elastically supports the first friction pad 26 in the disc radial direction.

[0119] As described above, the first friction lining 26 is biased outward in the disk radial direction by the biasing force of the inner spring plate portion 121 of the first pad spring 24 and the inner spring plate portion 121 of the second pad spring 25. When the first friction lining 26 is biased in this way without any influence from the disk 11, the projection portion 176 on the forward disk rotation input side comes into surface contact with the outer support plate portion 112 of the inner guide recess 120 of the first pad spring 24 in the outer surface portion 192.

[0120] Further, in this state, the protrusion portion 176 on the forward disc rotation output side of the first friction pad 26 comes into surface contact with the outer support plate portion 112 of the inner guide recess 120 of the second pad spring 25 in the outer surface portion 192.

[0121] Further, in this state, the projection portion 176 on the forward disc rotation input side of the first friction pad 26 is supported by the inner guide recess 120 of the first pad spring 24 to be movable in the disc axial direction.

[0122] Further, in this state, the projection portion 176 on the forward disc rotation output side of the first friction pad 26 is supported by the inner guide recess 120 of the second pad spring 25 to be movable in the disc axial direction.

[0123] When the first friction pad 26 is biased toward the forward disk rotation output side by the biasing force of the inner spring plate portion 131 of the first pad spring 24 in a state without any input from the disk 11, the protrusion portion 176 on the forward disk rotation output side comes into surface contact with the wall plate portion 113A of the inner guide recess 120A of the second pad spring 25 in the tip surface portion 193 of the outer end in the disk rotation direction.

[0124] Further, in this state, the first friction pad 26 is in a state where the tip surface portion 193 of the projection portion 176 on the forward disk rotation input side does not contact the wall plate portion 113 of the inner guide recess 120 of the first pad spring 24 and has a gap between the tip surface portion and the wall plate portion 113 in the disk rotation direction.

[0125] The inner guide recess 120 of the first pad spring 24 includes the wall plate portion 113, which is curved from the third surface portion 63 of the torque-absorbing portion 60 of the first connecting portion 46 toward the first friction pad 26. This wall plate portion 113 also elastically supports the first friction pad 26 in the disk rotation direction when the tip surface portion 193 of the projection portion 176 on the forward disk rotation input side of the first friction pad 26 comes into contact with the wall plate portion. Here, in the spring plate portion 131 and the wall plate portion 113 on the inner side of each of the first pad springs 24, the spring constant of the spring plate portion 131 is smaller than the spring constant of the wall plate portion 113.

[0126] In the disc brake 10, the above-described state is a first state in which one of the spring plate portions 131 and the wall plate portion 113 on the inner side of each of the first pad springs 24 comes into contact with the first friction pad 26, and the other has a gap between the other and the first friction pad 26. In the first pad spring 24, the inner spring plate portion 131 is located on the outer disc radial side with respect to the inner wall plate portion 113. This first state is a state in which the first friction pad 26 has the gap between the first friction pad and the inner wall plate portion 113 of the first pad spring 24 by the assistance of the inner spring plate portion 131 of the first pad spring 24.

[0127] The first pad spring 24 has the inner spring plate portion 121 provided on the inner side to contact the first friction pad 26 and support the first friction pad 26 on the outer disc radial side. When the vehicle decelerates in the reverse direction, the apex of the curvature of the inner wall plate portion 113 of the first pad spring 24 comes into contact with the center of the projection portion 176 on the reverse disc rotation output side of the first friction pad 26 in the direction of the radial direction reference line.

[0128] As in Fig. 2, the second friction pad 27 on the outside is in a state where the pad 173 faces the second braking surface 11b on the outside of the disk 11. The first friction pad 26 on the inside is in a state where the pad 173 faces the first braking surface 11a on the inside of the disk 11. The second friction pad 27 contacts the second braking surface 11b of the disk 11 in the surface on the side opposite the back plate 172 in the pad 173. The first friction pad 26 contacts the first braking surface 11a of the disk 11 in the surface on the side opposite the back plate 171 in the pad 173.

[0129] As in Fig. 4, the wear sensor 183 mounted on the inner side of the first friction lining 26 is arranged on the forward disc rotation input side of the first friction lining 26.

[0130] The pair of return springs 196 provided on the inner side of the first friction pad 26 are arranged on both end sides of the first friction pad 26 in the disk rotation direction. The return spring 196 mounted on the forward disk rotation input side of the first friction pad 26 comes into contact with the surface on the side opposite the disk 11 in the axial direction of the first connecting portion 46. The return spring 196 mounted on the forward disk rotation output side of the first friction pad 26 comes into contact with the surface on the side opposite the disk 11 in the axial direction of the second connecting portion 47. These return springs 196 urge the first friction pad 26, which is moved toward the disk 11 in the disk axial direction, in a direction away from the disk 11.

[0131] As in Fig. As shown in Figure 5, the pair of return springs 196 provided on the outer side of the second friction pad 27 are arranged on both end sides of the second friction pad 27 in the disk rotation direction. The return spring 196 mounted on the forward disk rotation input side of the second friction pad 27 comes into contact with the surface on the side opposite the disk 11 in the axial direction of the third connecting portion 51. The return spring 196 mounted on the forward disk rotation output side of the second friction pad 27 comes into contact with the surface on the side opposite the disk 11 in the axial direction of the fourth connecting portion 52. These return springs 196 urge the second friction pad 27, which is moved toward the disk 11 in the disk axial direction, in a direction away from the disk 11.

[0132] As in Fig. 1, the brake caliper 21 comprises a brake caliper body 201, a first sliding pin 202, a second sliding pin 203, a fastening bolt 204, a fastening screw (not shown) and a piston (not shown).

[0133] The brake caliper 21 has a substantially mirror-symmetrical shape, and the radial direction reference line and the radial direction reference plane pass through the center of the caliper 21 in the disc rotation direction. In the brake caliper 21, the first slide pin 202 is fixed to the caliper body 201 by the fixing bolt 204. Furthermore, in the brake caliper 21, the second slide pin 203 is fixed to the caliper body 201 by a fixing bolt (not shown). The pair of first and second slide pins 202 and 203 are aligned in the axial direction and arranged parallel to each other.

[0134] The fastening member 20 is provided with a first pin insertion hole (not shown) extending along the disc axial direction from the inner side surface of the first connecting portion 33 to the intermediate position within the first connecting portion 33. Further, the fastening member 20 is provided with a second pin insertion hole (not shown) extending along the disc axial direction from the inner end surface of the second connecting portion 34 to the intermediate position within the second connecting portion 34. In the brake caliper 21, the first slide pin 202 is slidably mounted in the first pin insertion hole (not shown) of the fastening member 20. Further, in the brake caliper 21, the second slide pin 203 is slidably mounted in the second pin insertion hole (not shown) of the fastening member 20.

[0135] Accordingly, in the brake caliper 21, the caliper body 201 is supported by the fixing member 20 via the first sliding pin 202 and the second sliding pin 203 so as to be slidable along the disc axial direction. In other words, the fixing member 20 supports the caliper 21 so as to be slidable in the disc axial direction in the pair of first and second connecting portions 33 and 34. Thus, the caliper 21 is provided in the fixing member 20 so as to be movable in the disc axial direction. The first pin collar 22 covers a portion of the first sliding pin 202 protruding from the fixing member 20. The second pin collar 23 covers a portion of the second sliding pin 203 protruding from the fixing member 20.

[0136] The caliper body 201 has a substantially mirror-symmetrical shape. The radial direction reference line and the radial direction reference plane pass through the center of the caliper body 201 in the disc rotation direction. The caliper body 201 has a cylinder portion 221, a bridge portion 222, a claw portion 223, a first pin arrangement portion 224, and a second pin arrangement portion 225.

[0137] The cylinder portion 221 is disposed on the inner side of the disc 11 in the disc axial direction. The bridge portion 222 extends from the portion on the outer disc radial side of the cylinder portion 221 toward the outer side along the disc axial direction over the outer periphery of the disc 11. The claw portion 223 extends from the portion on the opposite side to the cylinder portion 221 in the bridge portion 222 toward the inner disc radial side and is disposed on the outer side of the disc 11. The first pin arrangement portion 224 is disposed on the forward disc rotation input side with respect to the cylinder portion 221. The second pin arrangement portion 225 is disposed on the forward disc rotation output side with respect to the cylinder portion 221. In the caliper body 201, the first slide pin 202 is fixed to the first pin arrangement portion 224 by the fixing bolt 204.In the caliper body 201, the second slide pin 203 is fixed to the second pin arrangement portion 225 by a fixing bolt (not shown).

[0138] The cylinder portion 221 is provided with a cylinder hole (not shown). The cylinder hole (not shown) is recessed in a direction opposite to the disc 11 from the end surface on the disc 11 side in the disc axial direction of the cylinder portion 221. Thus, the cylinder hole (not shown) opens toward the disc 11. The cylinder hole (not shown) follows the axial direction of the disc. The cylinder portion 221 has a plurality of cylinder holes (not shown), specifically, two cylinder holes arranged in the circumferential direction of the disc. A piston (not shown) is accommodated in each of these cylinder holes (not shown). Thus, the brake caliper 21 is a two-pot type. The claw portion 223 is provided to face the cylinder portion 221 in the disc axial direction.

[0139] The piston (not shown) is housed in the cylinder hole (not shown) of the cylinder portion 221 so as to be movable in the disk axial direction. The piston (not shown) faces the first braking surface 11a of the disk 11. The first friction pad 26 is arranged between the first braking surface 11a of the disk 11 and the piston (not shown). When the piston (not shown) moves toward the first braking surface 11a of the disk 11, the first friction pad 26 is pressed.

[0140] When the vehicle is decelerated in the forward direction, a fluid is introduced into the disc brake 10 between the piston (not shown) and the cylinder opening (not shown) of the cylinder section 221 of the brake caliper 21 via a brake line (not shown). Then, pressure from the brake fluid in the brake caliper 21 acts on the piston (not shown) in the cylinder section 221, and the piston (not shown) moves toward the disc 11. The piston (not shown) moving forward in this way presses the first friction lining 26 on the inside, which is arranged between the piston and the disc 11, toward the disc 11.Then, the first friction pad 26 moves on the inside in the axial direction of the disc while being guided by the fixing member 20 via the first pad spring 24 and the second pad spring 25, and comes into contact with a first braking surface 11a of the disc 11 in the pad 173 to be pressed against the disc 11.

[0141] At this time, the first friction pad 26 on the inner side is also pressed toward the forward disk rotation output side by the frictional force with the rotating disk 11. Then, the torque receiving portion 60 of the second connecting portion 47 on the inner side and the forward disk rotation output side (shown in Fig. 4) of the fastening element 20, a braking torque from the projection portion 176 on the inner disc rotation output side of the first friction pad 26 via the wall plate portion 113A of the inner guide recess 120A of the second pad spring 25.

[0142] Due to the reaction force of the first friction lining 26, which presses against the disc 11 by the piston (not shown), the Fig. 1, the caliper body 201 slides in the disc axial direction by sliding the first slide pin 202 and the second slide pin 203 against the fixing member 20. Then, the claw portion 223 of the caliper body 201 presses the second friction pad 27 on the outer side, which is arranged between the claw portion 223 and the disc 11, against the disc 11. Then, the second friction pad 27 on the outer side moves in the axial direction of the disc while being guided by the fixing member 20 via the first pad spring 24 and the second pad spring 25, and comes into contact with the other second braking surface 11b of the disc 11 in the pad 173 to be pressed against the disc 11.

[0143] At this time, the second friction pad 27 on the outer side is also pressed toward the forward disc rotation output side by the frictional force with the rotating disc 11. Then, the torque receiving portion 60 of the fourth connecting portion 52 on the outer side and the forward disc rotation output side (shown in Fig. 5) of the fastening element 20, a braking torque from the projection portion 176 on the forward disc rotation output side of the second friction pad 27 via the wall plate portion 113A of the outer guide recess 120A of the second pad spring 25.

[0144] In this way, the brake calliper 21 (shown in Fig. 1) Sliding through the fastening member 20, the pair of first and second friction pads 26 and 27 are engaged from both sides in the disc axial direction by the piston (not shown) and the claw portion 223 according to the operation of the piston (not shown). Then, the brake caliper 21 presses the first friction pad 26 against the first braking surface 11a of the disc 11 and presses the second friction pad 27 against the second braking surface 11b of the disc 11. Consequently, the disc brake 10 generates a braking force by exerting frictional resistance on the disc 11. The brake caliper 21 is a so-called floating caliper (sliding caliper).

[0145] When braking the vehicle in the reverse direction as described above, the disc brake 10 presses the first friction pad 26 against the first braking surface 11a of the disc 11 and presses the second friction pad 27 against the second braking surface 11b of the disc 11. At this time, the first friction pad 26 and the second friction pad 27 are pressed toward the reverse disc rotation output side opposite to the above-described side by the disc 11 rotating in the direction opposite to the above-described direction.

[0146] Then, the first friction pad 26 elastically deforms the inner spring plate portion 131 of the first pad spring 24 by pressing the inner spring plate portion at the end surface 184 on the reverse disc rotation output side of the main body portion 175 toward the reverse disc rotation output side. Then, the first friction pad 26 comes into contact with the apex of the curve of the inner wall plate portion 113 of the first pad spring 24 at the center toward the radial direction reference line of the protrusion portion 176 on the reverse disc rotation output side. Then, this protrusion portion 176 elastically presses and deforms the wall plate portion 113 toward the reverse disc rotation output side at the tip surface portion 193.Then, this wall portion 113 finally becomes flat and comes into surface contact with the tip surface portion 193 of the projection portion 176 on the reverse disc rotation output side of the first friction pad 26 and the third surface portion 63 as a torque receiving surface of the torque receiving portion 60 of the first connecting portion 46.

[0147] In the disc brake 10, this state transitions to a second state in which the gap between the tip surface portion 193 of the protrusion portion 176 on the reverse disc rotation output side of the first friction pad 26 and the inner wall plate portion 113 of the first pad spring 24 is filled by the movement of the first friction pad 26. In the second state, the torque receiving portion 60 of the first connecting portion 46 on the inner side and the reverse disc rotation output side of the fastening element 20 receives a braking torque from the protrusion portion 176 on the reverse disc rotation output side of the first friction pad 26 via the inner wall plate portion 113 of the first pad spring 24 in the third surface portion 63.

[0148] Furthermore, the second friction lining 27, which is pressed by the disc 11 toward the reverse disc rotation output side, elastically deforms the Fig.6 by pressing the outer spring plate portion 131 of the first pad spring 24 toward the reverse disc rotation output side at the end surface 184 on the reverse disc rotation output side of the main body portion 185. Then, the second friction pad 27 comes into contact with the apex of the curve of the outer wall plate portion 113 of the first pad spring 24 at the center toward the radial direction reference line of the protrusion portion 176 on the reverse disc rotation output side. Then, this protrusion portion 176 elastically presses and deforms the wall plate portion 113 toward the reverse disc rotation output side at the tip surface portion 193.Then, this wall plate portion 113 finally becomes flat and comes into surface contact with the tip surface portion 193 of the projection portion 176 on the reverse disk rotation output side of the second friction pad 27 and the third surface portion 63 as a torque receiving surface of the torque receiving portion 60 of the third connecting portion 51.

[0149] In the disc brake 10, this state transitions to a second state in which the gap S between the tip surface portion 193 of the protrusion portion 176 on the reverse disc rotation output side of the second friction pad 27 and the outer wall plate portion 113 of the first pad spring 24 is filled by the movement of the second friction pad 27. In the second state, the torque receiving portion 60 of the third connecting portion 51 on the outer surface and the reverse disc rotation output side of the fastening element 20 receives a braking torque from the protrusion portion 176 on the reverse disc rotation output side of the second friction pad 27 via the outer wall plate portion 113 of the first pad spring 24 in the third surface portion 63.

[0150] Patent Document 1 described above discloses a disc brake having a pad spring attached to a mounting member and elastically supporting a friction pad. Furthermore, it is desirable to suppress the generation of abnormal noise in the disc brake. For example, in the disc brake, when the braking state of the vehicle changes from forward to reverse, the friction pad moves within the mounting member, causing a knocking noise, i.e., a so-called rattling noise, between the friction pad and the mounting member. In the disc brake, it is desirable to suppress the generation of abnormal noise.

[0151] In the disc brake 10 of the embodiment, each of the first pad springs 24 on the forward disc rotation input side has the spring plate portion 131 and the guide recess 120 on the outer side. The outer spring plate portion 131 of the first pad spring 24 elastically supports the second friction pad 27 in the disc rotation direction. The outer guide recess 120 of the first pad spring 24 is offset from the outer spring plate portion 131 in the disc radial direction, covers the outer torque-absorbing portion 60, and elastically supports the second friction pad 27 in the disc rotation direction. Then, the disc brake 10 has a first state and a second state on the outer side.In the first state on the outside, the spring plate portion 131 serving as one of the spring plate portions 131 and the guide recess 120 on the outside of each of the first pad springs 24 comes into contact with the second friction pad 27, and the guide recess 120 serving as the other has the gap S between the wall plate portion 113 and the second friction pad 27. In the second state on the outside, the gap S is filled by the movement of the second friction pad 27. Therefore, in the disc brake 10, when the vehicle braking state changes from the forward traveling direction to the reverse traveling direction, the second friction pad 27 moves toward the reverse disc rotation output side and elastically deforms the outer spring plate portion 131 of the first pad spring 24 from the first state on the outside.Then, the second friction pad 27 enters the second state in which both the wall plate portion 113 of the guide recess 120 and the spring plate portion 131 on the outer side of each of the first pad springs 24 are elastically deformed to fill the gap S between the wall plate portion 113 and the second friction pad 27. Thus, the first pad spring 24 is gradually elastically deformed to absorb the impact energy of the second friction pad 27 against the fastening member 20. Consequently, the disc brake 10 can suppress the generation of abnormal noise, such as a knocking noise, i.e., a so-called rattling noise, between the friction pad and the fastening member 20 due to the movement of the second friction pad 27 within the fastening member 20 when the vehicle braking state changes from the forward traveling direction to the reverse traveling direction.

[0152] Furthermore, each of the first pad springs 24 has the spring plate portion 131 and the guide recess 120 on the inner side. The inner spring plate portion 131 of the first pad spring 24 elastically supports the first friction pad 26 in the disc rotation direction. The inner guide recess 120 of the first pad spring 24 is offset from the inner spring plate portion 131 in the disc radial direction, covers the inner torque-absorbing portion 60, and elastically supports the first friction pad 26 in the disc rotation direction. The disc brake 10 then also has the first state and the second state on the inner side.In the first state on the inside, the spring plate portion 131, which is one of the spring plate portion 131 and the guide recess 120 on the inside of each of the first pad springs 24, comes into contact with the first friction pad 26, and the guide recess 120 serving as the other has a gap between the wall plate portion 113 and the first friction pad 26. In the second state on the inside, the gap is filled by the movement of the first friction pad 26. Therefore, in the disc brake 10, when the vehicle braking state changes from the forward traveling direction to the reverse traveling direction, the first friction pad 26 moves toward the reverse disc rotation output side and elastically deforms the inner spring plate portion 131 of the first pad spring 24 from the first state on the inside.Then, the first friction pad 26 enters the second state in which both the wall plate portion 113 of the guide recess 120 and the spring plate portion 131 on the inner side of each of the first pad springs 24 are elastically deformed to fill the gap between the wall plate portion 113 and the first friction pad 26. Thus, the first pad spring 24 is gradually elastically deformed to absorb the impact energy of the first friction pad 26 against the fastener 20. Consequently, the disc brake 10 can suppress the generation of abnormal noise, such as a knocking noise, i.e., a so-called rattling noise, between the friction pad and the fastener 20 due to the movement of the first friction pad 26 within the fastener 20 when the vehicle braking state changes from the forward traveling direction to the reverse traveling direction.

[0153] Since the disc brake 10 enters the first state in the non-braking state, the second friction pad 27 can be pressed toward the forward disc rotation output side by the outer spring plate portion 131 of the first pad spring 24. Thus, the disc brake 10 can suppress the generation of abnormal noise generated between the friction pad and the fixing member 20 due to the movement of the second friction pad 27 toward the forward disc rotation output side within the fixing member 20 when the vehicle is braked from the non-braking state in the forward travel direction.

[0154] Furthermore, since the disc brake 10 enters the first state in the non-braking state, the first friction pad 26 can be pressed toward the forward disc rotation output side by the inner spring plate portion 131 of the first pad spring 24. Thus, the disc brake 10 can suppress the generation of abnormal noise generated between the friction pad and the fixing member 20 due to the movement of the first friction pad 26 toward the forward disc rotation output side within the fixing member 20 when the vehicle is braked from the non-braking state in the forward travel direction.

[0155] Since the disc brake 10 enters the first state upon brake release, the second friction pad 27 is pressed toward the forward disc rotation output side only along the spring plate portion 131, which serves as one of the wall plate portion 113 of the guide recess 120 and the spring plate portion 131 on the outer side of each of the first pad springs 24. Thus, the disc brake 10 can reduce the friction force between the second friction pad 27 and the outer guide recess 120 of the second pad spring 25 upon brake release and suppress the resistance of the second friction pad 27 against the disc 11 upon brake release.

[0156] Furthermore, since the disc brake 10 enters the first state upon brake release, the first friction pad 26 is pressed toward the forward disc rotation output side only along the spring plate portion 131, which serves as one of the wall plate portion 113 of the guide groove 120 and the spring plate portion 131 on the inside of each of the first pad springs 24. Thus, the disc brake 10 can reduce the frictional force between the first friction pad 26 and the inside guide groove 120 of the second pad spring 25 upon brake release and suppress the resistance of the first friction pad 26 against the disc 11 upon brake release.

[0157] Furthermore, the disc brake 10 may have the first state in which the wall plate portion 113 of the guide recess 120 serving as one of the guide recess 120 and the spring plate portion 131 on the outer side of each of the first pad springs 24 comes into contact with the second friction pad 27 and the spring plate portion 131 serving as the other has a gap between the other and the second friction pad 27, and the second state in which the gap is filled by the movement of the second friction pad 27.Furthermore, the disc brake 10 may have the first state in which the wall plate portion 113 of the guide groove 120 serving as one of the guide groove 120 and the spring plate portion 131 on the inner side of each of the first pad springs 24 comes into contact with the first friction pad 26, and the spring plate portion 131 serving as the other has a gap between the other and the first friction pad 26, and the second state in which the gap is filled by the movement of the first friction pad 26. In either case, the same effect as above can be achieved.

[0158] In the disc brake 10, the outer spring plate portion 131 of the first pad spring 24 is disposed on the outer disc radial side with respect to the outer guide groove 120, and in the first state described above, the outer spring plate portion 131 comes into contact with the second friction pad 27, and the outer guide groove 120 has the gap S between the wall plate portion 113 and the second friction pad 27. Therefore, since the disc brake 10 enters the first state in the non-braking state, the second friction pad 27 can be pressed toward the forward disc rotation output side by the outer spring plate portion 131 disposed on the outer disc radial side with respect to the outer guide groove 120 in the first pad spring 24. Thus, the disc brake 10 can effectively suppress the chatter of the second friction pad 27 in the non-braking state when the vehicle is in the forward traveling direction.

[0159] Furthermore, in the disc brake 10, the inner spring plate portion 131 of the first pad spring 24 is arranged on the outer disc radial side with respect to the inner guide recess 120, and in the above-described first state, the inner spring plate portion 131 comes into contact with the first friction pad 26, and the inner guide recess 120 has a gap between the wall plate portion 113 and the first friction pad 26. Therefore, since the disc brake 10 enters the first state in the non-braking state, the first friction pad 26 can be pressed toward the forward disc rotation output side by the inner spring plate portion 131 arranged on the outer disc radial side with respect to the inner guide recess 120 in the first pad spring 24. Thus, the disc brake 10 can effectively suppress the rattling of the first friction pad 26 in the non-braking state when the vehicle is in the forward direction.

[0160] In the first pad spring 24 of the disc brake 10, the spring constant of the outer spring plate portion 131 is smaller than the spring constant of the wall plate portion 113 of the outer guide recess 120. Therefore, when the brake is released, the disc brake 10 presses the second friction pad 27 toward the forward disc rotation output side through the outer spring plate portion 131 in which the spring constant of the first pad spring 24 is smaller than that of the wall plate portion 113 of the outer guide recess 120. Therefore, the disc brake 10 can further suppress the resistance of the second friction pad 27 on the disc 11 when the brake is released.

[0161] Furthermore, in the first pad spring 24 of the disc brake 10, the spring constant of the inner spring plate portion 131 is smaller than the spring constant of the wall plate portion 113 of the inner guide recess 120. Therefore, when the brake is released, the disc brake 10 presses the first friction pad 26 toward the forward disc rotation output side through the inner spring plate portion 131, in which the spring constant in the first pad spring 24 is smaller than that of the wall plate portion 113 of the inner guide recess 120. Therefore, the disc brake 10 can further suppress the resistance of the first friction pad 26 on the disc 11 when the brake is released.

[0162] The disc brake 10 includes the wall plate portion 113 in which the outer guide groove 120 of the first pad spring 24 is curved from the third surface portion 63 as the torque receiving surface of the torque receiving portion 60 on the outer side and the forward disc rotation input side toward the second friction pad 27. Therefore, the disc brake 10 can achieve the above-described effect through a simple structure in which the shape of the wall plate portion 113 of the outer guide groove 120 of the first pad spring 24 is curved.

[0163] Furthermore, the disc brake 10 includes the wall plate portion 113 in which the inner guide recess 120 of the first pad spring 24 is curved from the third surface portion 63 as the torque receiving surface of the torque receiving portion 60 on the inner side and the forward disc rotation input side toward the first friction pad 26. Therefore, the disc brake 10 can achieve the above-described effect through a simple structure in which the shape of the wall plate portion 113 of the inner guide recess 120 of the first pad spring 24 is curved.

[0164] The disc brake 10 includes the outer spring plate portion 121, in which the first pad spring 24 on the forward disc rotation input side comes into contact with the second friction pad 27 and supports the second friction pad 27 on the outer disc radial side. Then, when the vehicle is braked in a reverse direction, the first pad spring 24 is in a state where the apex of the curve of the wall plate portion 113 of the outer guide groove 120 comes into contact with the center of the protrusion portion 176 located inside the torque receiving portion 60 on the forward disc rotation input side of the second friction pad 27. Therefore, the disc brake 10 can effectively generate the biasing force toward the second friction pad 27 through the wall plate portion 113 of the outer guide groove 120 of the first pad spring 24.

[0165] Furthermore, the disc brake 10 includes the inner spring plate portion 121, in which the first pad spring 24 on the forward disc rotation input side contacts the first friction pad 26 and supports the first friction pad 26 on the outer disc radial side. Then, when the vehicle is braked in a reverse direction, the first pad spring 24 is in a state where the apex of the curvature of the wall plate portion 113 of the inner guide groove 120 comes into contact with the center of the protrusion portion 176 located within the torque receiving portion 60 on the forward disc rotation input side of the first friction pad 26. Therefore, the disc brake 10 can effectively generate a biasing force toward the first friction pad 26 through the wall plate portion 113 of the inner guide groove 120. LIST OF REFERENCE SYMBOLS 10 disc brake 11 discs 20 Fastening element 21 brake caliper 24 First pad spring (pad spring) 26 First friction lining (friction lining) 27 Second friction lining (friction lining) 60 Torque absorption section 113 wall plate section (elastic plate section) 120 Guide recess (second support section) 121 Spring plate section (third support section) 131 Spring plate section (first support section) 176 projection section S gap QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2022-191119

[0001] JP 2021-116882

[0003]

Claims

[1] Disc brake having the following: a fastener attached to a non-rotating portion of a vehicle and having a torque receiving portion in a disc rotation direction; a friction lining movable in a disc axial direction; a brake caliper carried by the fastener and pressing the friction lining against a disc; and a pad spring which is attached to the fastening element and elastically supports the friction pad, wherein the pad spring has, on a disc rotation input side, a first support portion that elastically supports the friction pad in the disc rotation direction, and a second support portion that is offset from the first support portion in a disc radial direction, covers the torque absorbing portion, and elastically supports the friction pad in the disc rotation direction, and wherein the disc brake has a first state in which one of the first support portion and the second support portion comes into contact with the friction pad and the other has a gap between the other and the friction pad, and a second state in which the gap is filled by the movement of the friction pad. [2] Disc brake according to claim 1, wherein the first support portion is arranged on an outer disc radial side with respect to the second support portion, and wherein the first state is a state in which the friction lining has a gap between the friction lining and the second support portion due to the support of the first support portion. [3] A disc brake according to claim 2, wherein a spring constant of the first support portion is smaller than a spring constant of the second support portion. [4] A disc brake according to any one of claims 1 to 3, wherein the second support portion includes an elastic plate portion curved from a torque receiving surface of the torque receiving portion toward the friction lining. [5] A disc brake according to claim 4, wherein the pad spring has a third support portion that comes into contact with the friction pad and supports the friction pad on the outer disc radial side, and wherein, when the vehicle is braked in a reverse direction, an apex of a curve of the elastic plate portion comes into contact with a center of a projection portion disposed inside the torque receiving portion of the friction pad. [6] Disc brake having the following: a fastener attached to a non-rotating portion of a vehicle and having a torque receiving portion in a disc rotation direction; a friction lining movable in a disc axial direction; a brake caliper carried by the fastener and pressing the friction lining against a disc; and a pad spring which is attached to the fastening element and elastically supports the friction pad, wherein the pad spring has, on a disc rotation input side, a first support portion that elastically supports the friction pad in the disc rotation direction, and a second support portion that is offset from the first support portion in a disc radial direction, covers the torque absorbing portion, and elastically supports the friction pad in the disc rotation direction, and wherein a spring constant of the first support portion is smaller than a spring constant of the second support portion.

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