Disc brake

Abstract

A pad spring (24) on the disc rotation direction shift-in side has: a first support section (131) that elastically supports a friction pad (27) in the disc rotation direction; and a second support section (120) that is offset in the disc radial direction with respect to the first support section (131), covers the torque receiving section (60), and elastically supports the friction pad (27) in the disc rotation direction. One of the first support part (131) and the second support part (120) is in contact with the friction pad (27), and a gap (S) is formed between the other of the first support part and the second support part and the friction pad (27), and a second state in which the gap (S) is filled by the movement of the friction pad (27) is provided.

Description

Technical Field

[0001] The present invention relates to disc brakes.

[0002] This application claims priority based on Japanese patent application No. 2022-191119, filed on November 30, 2022, the contents of which are cited here. Background Art

[0003] There is known a disc brake including a pad spring that is mounted on a mounting member and elastically supports a friction pad (for example, refer to Patent Document 1).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: (Japan) Patent Publication No. 2021-116882 Summary of the invention

[0007] Technical problem to be solved by the invention

[0008] In a disc brake, it is desired to suppress the generation of abnormal noise.

[0009] The present invention provides a disc brake capable of suppressing the generation of abnormal noise.

[0010] Technical solutions for solving technical problems

[0011] According to a first aspect of the present invention, a disc brake comprises: a mounting member mounted on a non-rotating part of a vehicle and having a torque receiving portion in the disc rotation direction; a friction pad that can move along the disc axis direction; a brake caliper supported by the mounting member and pressing the friction pad against the disc; and a pad spring mounted on the mounting member and elastically supporting the friction pad. The pad spring on the disc rotation direction inward side comprises: a first supporting portion that elastically supports the friction pad in the disc rotation direction; and a second supporting portion that is offset in the disc radius direction relative to the first supporting portion, covers the torque receiving portion, and elastically supports the friction pad in the disc rotation direction. There is a first state in which one of the first supporting portion and the second supporting portion abuts against the friction pad and a gap exists between the other and the friction pad, and a second state in which the gap is filled by the movement of the friction pad.

[0012] According to the second embodiment of the present invention, the disc brake comprises: a mounting member, which is mounted on a non-rotating part of a vehicle and has a torque bearing portion in the disc rotation direction; a friction pad, which can move along the disc axis direction; a brake caliper, which is supported by the mounting member and presses the friction pad against the disc; and a pad spring, which is mounted on the mounting member and elastically supports the friction pad. The pad spring on the disc rotation direction inward side comprises: a first support portion, which elastically supports the friction pad in the disc rotation direction; and a second support portion, which is offset in the disc radius direction relative to the first support portion, covers the torque bearing portion, and elastically supports the friction pad in the disc rotation direction. The spring constant of the first support portion is smaller than the spring constant of the second support portion.

[0013] Effects of the Invention

[0014] According to the present invention, the generation of abnormal noise can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a perspective view showing a disc brake according to the embodiment.

[0016] Figure 2 This is a perspective view showing the disc brake according to the embodiment, with components of the caliper other than the slide pin removed.

[0017] Figure 3 This is a diagram showing the disc brake according to the embodiment as viewed from the inside in the disc radial direction, with components of the caliper other than the slide pin removed.

[0018] Figure 4 This is a diagram showing the disc brake according to the embodiment as viewed from the inside, with components of the caliper other than the slide pin removed.

[0019] Figure 5 This is a diagram showing the disc brake according to the embodiment as viewed from the outside with the brake caliper removed.

[0020] Figure 6 This is a partial view showing the disc brake according to the embodiment as seen from the outside with the return spring and the rivet removed.

[0021] Figure 7 It is a perspective view showing a first pad spring of the disc brake according to the embodiment.

[0022] Figure 8 It is a side view showing a first pad spring of the disc brake according to the embodiment.

[0023] Fig. 9 It is a partial side view showing a first pad spring of the disc brake according to the embodiment.

[0024] Fig.10 It is a side view showing a second pad spring of the disc brake according to the embodiment.

[0025] Fig.11 This is a diagram schematically showing a first state of the disk brake according to the embodiment as viewed from the outside. DETAILED DESCRIPTION

[0026] Hereinafter, embodiments will be described with reference to the drawings. Figure 1 The disc brake 10 of the embodiment shown is used for a vehicle such as a motor vehicle to apply a braking force to the vehicle. Specifically, the disc brake 10 is used for braking a four-wheeled motor vehicle. The disc brake 10 brakes the vehicle by stopping the rotation of a disc-shaped disc 11 that rotates together with a wheel (not shown).

[0027] The disc brake 10 includes a mounting member 20 , a caliper 21 , a first pin cover 22 , a second pin cover 23 , a first pad spring 24 (pad spring), a second pad spring 25 , a first friction pad 26 , and a second friction pad 27 .

[0028] Hereinafter, the central axis of the disk 11 is referred to as the disk axis. In addition, the extending direction of the disk axis is referred to as the disk axis direction. The radial direction of the disk 11 in the disk brake 10 is referred to as the disk radial direction. The rotational direction of the disk 11 in the disk brake 10, i.e., the circumferential direction, is referred to as the disk rotational direction. The center side of the disk 11 in the disk radial direction is referred to as the disk radial inner side. The side opposite to the center of the disk 11 in the disk radial direction is referred to as the disk radial outer side. The center side of the length of the disk rotational direction in the disk brake 10 is referred to as the disk rotational inner side. The side opposite to the center of the length of the disk rotational direction in the disk brake 10 is referred to as the disk rotational outer side. A line passing through the center of the disk axis, the mounting member 20, and the brake caliper 21 in the disk rotational direction and along the disk radial direction is referred to as a radial reference line. The radial reference line is orthogonal to the disk axis. A plane including the radial reference line and the disk axis is referred to as a radial reference plane.

[0029] The outer side in the vehicle width direction of the vehicle provided with the disc brake 10 is referred to as the outer side. The inner side in the vehicle width direction of the vehicle provided with the disc brake 10 is referred to as the inner side. The inlet side of the rotation direction Fr of the disc 11 in the disc brake 10 when the vehicle provided with the disc brake 10 is traveling forward is referred to as the disc rotation direction turning-in side when the vehicle provided with the disc brake 10 is traveling forward (disc rotation direction turning-in side). The outlet side of the rotation direction Fr of the disc 11 in the disc brake 10 when the vehicle provided with the disc brake 10 is traveling forward is referred to as the disc rotation direction turning-out side when the vehicle provided with the disc brake 10 is traveling forward (disc rotation direction turning-out side). The disc rotation direction turning-in side when the vehicle provided with the disc brake 10 is traveling backward is referred to as the outlet side of the rotation direction of the disc 11 in the disc brake 10 when the vehicle provided with the disc brake 10 is traveling backward. The outlet side of the rotation direction of the disc 11 in the disc brake 10 when the vehicle is traveling backward is referred to as the disc rotation direction turning-out side when the vehicle is traveling backward. The forward disc rotation direction exit side is the rotation direction entry side of the disc 11 in the disc brake 10 when the vehicle equipped with the disc brake 10 is traveling backward. The rotation direction entry side of the disc 11 in the disc brake 10 when the vehicle is traveling backward is called the reverse disc rotation direction entry side.

[0030] like Figure 2 As shown, the mounting member 20 is provided on the vehicle across the outer peripheral side of the disk 11. The mounting member 20 is mounted on a non-rotating portion of the vehicle (not shown) in this state. The mounting member 20 includes an inner side arrangement portion 31, an outer side arrangement portion 32, and a pair of first connection portions 33 and second connection portions 34 connecting them. The mounting member 20 has a shape that is substantially mirror-symmetrical with respect to a radial direction reference plane.

[0031] like Figure 3 As shown, the disk 11 has a first braking surface 11a on one side in the disk axis direction and a second braking surface 11b on the other side in the disk axis direction. The first braking surface 11a is arranged on the inner side of the disk 11. The second braking surface 11b is arranged on the outer side of the disk 11.

[0032] The inner side arrangement portion 31 is arranged on one side of the disk 11 in the disk axis direction and is mounted on the non-rotating portion of the vehicle. The non-rotating portion of the vehicle on which the mounting member 20 is mounted is arranged on the inner side relative to the disk 11. Therefore, the inner side arrangement portion 31 mounted on the non-rotating portion is also arranged on the inner side relative to the disk 11. The inner side arrangement portion 31 is opposite to the first braking surface 11a of the disk 11. The inner side arrangement portion 31 is arranged on the inner side of the disk 11. Figure 2 The first friction pad 26 shown is supported to be movable along the disc axis. In other words, the first friction pad 26 is movable along the disc axis. The first friction pad 26 is arranged inside the disc 11. The first friction pad 26 is arranged opposite to the first braking surface 11a of the disc 11.

[0033] The outer configuration portion 32 is configured on the other side of the disk 11 in the disk axis direction. The outer configuration portion 32 is configured on the outer side relative to the disk 11. The outer configuration portion 32 is opposite to the second braking surface 11b of the disk 11. The outer configuration portion 32 supports the second friction pad 27 so that it can move along the disk axis direction. In other words, the second friction pad 27 can move along the disk axis direction. The second friction pad 27 is configured on the outer side relative to the disk 11. The second friction pad 27 is opposite to the second braking surface 11b of the disk 11.

[0034] The first connection portion 33 and the second connection portion 34 extend in the disk axis direction and are provided across the outer circumference of the disk 11 in the disk axis direction. The first connection portion 33 connects the ends of the inner arrangement portion 31 and the outer arrangement portion 32 on the outer side in the disk radius direction and on the side where the disk rotates forward when the disk moves forward. The second connection portion 34 connects the ends of the inner arrangement portion 31 and the outer arrangement portion 32 on the outer side in the disk radius direction and on the side where the disk rotates forward when the disk moves forward.

[0035] like Figure 4 As shown, the inner side arrangement portion 31 includes: a first fixing portion 42 having a threaded hole 41; a second fixing portion 44 having a threaded hole 43; and a main beam 45 connecting the first fixing portion 42 and the second fixing portion 44. In addition, the inner side 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 arranged on the inner side relative to the disc 11, and are all opposite to the first braking surface 11a of the disc 11.

[0036] The first fixing portion 42 is provided in the inner configuration portion 31 at a side closer to the disk rotation direction than the second fixing portion 44 when the disk is forwardly moved. The main beam 45 extends in the disk rotation direction. The threaded hole 41 is provided in the first fixing portion 42 along the disk axis direction. The threaded hole 43 is provided in the second fixing portion 44 along the disk axis direction. The mounting component 20 is mounted on the mounting portion by bolts (not shown) that are screwed into the threaded holes 41 and 43, in a state where the first fixing portion 42 and the second fixing portion 44 are in contact with a non-rotating portion of the vehicle, i.e., a mounting portion (not shown). The first fixing portion 42 and the second fixing portion 44 fixed to the non-rotating portion of the vehicle align their positions in the disk axis direction and the disk radius direction with each other. In this state, the main beam 45 overlaps the positions of the first fixing portion 42 and the second fixing portion 44 in the disk axis direction.

[0037] The first connection portion 46 overlaps with the first fixing portion 42 in the disk axis direction and extends outward in the disk radius direction from the first fixing portion 42. The second connection portion 47 overlaps with the second fixing portion 44 in the disk axis direction and extends outward in the disk radius direction from the second fixing portion 44. The first connection portion 46 is arranged at a position closer to the inward turning side of the disk rotation direction when moving forward than the second connection portion 47.

[0038] like Figure 2 As shown, the first connection portion 33 extends outward along the disc axis direction from the end portion of the first connection portion 46 on the outer side in the disc radial direction, crossing a position on the outer side in the disc radial direction than the outer circumference of the disc 11. The second connection portion 34 extends outward along the disc axis direction from the end portion of the second connection portion 47 on the outer side in the disc radial direction, crossing a position on the outer side in the disc radial direction than the outer circumference of the disc 11.

[0039] The outer arrangement portion 32 includes a third connection portion 51 extending from the first connection portion 33, a fourth connection portion 52 extending from the second connection portion 34, and an outer beam 53 connecting the third connection portion 51 and the fourth connection portion 52. The third connection portion 51, the fourth connection portion 52, and the outer beam 53 are all arranged outside the disc 11 and are all opposite to the second braking surface 11b of the disc 11.

[0040] The third connection portion 51 extends from the outer end portion of the first connection portion 33 in the disk axis direction to the inner side in the disk radius direction. The fourth connection portion 52 extends from the outer end portion of the second connection portion 34 in the disk axis direction to the inner side in the disk radius direction. The third connection portion 51 is arranged at a position closer to the side where the disk rotation direction turns in the forward direction than the fourth connection portion 52. The outer beam 53 connects the inner end portion of the third connection portion 51 in the disk radius direction to the inner end portion of the fourth connection portion 52 in the disk radius direction. The outer beam 53 extends along the disk rotation direction.

[0041] exist Figure 4 The first connection portion 46 and the second connection portion 47 shown, and Figure 5 The third connection portion 51 and the fourth connection portion 52 shown in the figure have torque receiving portions 60 of the same shape formed on the inner sides in the direction of rotation of the respective disks. Figure 4 The torque receiving portion 60 of the first connection portion 46 and the torque receiving portion 60 of the second connection portion 47 are arranged in a mirror-symmetrical manner in the disk rotation direction. Figure 5 The torque receiving portion 60 of the third connection portion 51 and the torque receiving portion 60 of the fourth connection portion 52 are arranged in mirror symmetry in the disk rotation direction. In other words, the mounting member 20 has the torque receiving portions 60 on both sides in the disk rotation direction.

[0042] by Figure 6The torque receiving portion 60 of the third connecting portion 51 shown in the figure is used as an example to explain the torque receiving portion 60 of four locations of the same shape. The torque receiving portion 60 has a first face portion 61, a second face portion 62, a third face portion 63 (torque receiving face), a fourth face portion 64, a fifth face portion 65, a sixth face portion 66, and a seventh face portion 67 in order from the inner side in the disk radial direction. The first face portion 61, the second face portion 62, the third face portion 63, the fourth face portion 64, the fifth face portion 65, the sixth face portion 66, and the seventh face portion 67 all extend along the disk axis direction.

[0043] The first surface portion 61 is curved and extends along the radial direction of the disk.

[0044] The second surface portion 62 is planar and extends from the outer side in the disc radial direction of the first surface portion 61 to the outer side in the disc rotation direction. The second surface portion 62 extends substantially perpendicularly to the radial reference line.

[0045] The third surface portion 63 is planar and extends from the outer side in the disc rotation direction of the second surface portion 62 to the outer side in the disc radial direction. The third surface portion 63 extends parallel to the radial reference plane.

[0046] The fourth surface portion 64 is planar and extends from the outer side in the disc radial direction to the inner side in the disc rotation direction of the third surface portion 63. The fourth surface portion 64 extends perpendicularly to the radial reference line.

[0047] The fifth surface portion 65 is planar and extends from the inner side in the disc rotation direction to the outer side in the disc radial direction of the fourth surface portion 64. The fifth surface portion 65 extends in parallel with the radial reference plane.

[0048] The sixth surface portion 66 is planar and extends from the outer side in the disc radial direction of the fifth surface portion 65 to the outer side in the disc rotation direction. The sixth surface portion 66 extends perpendicularly to the radial reference line.

[0049] The seventh surface portion 67 is planar and extends from the outer side in the disc radial direction of the sixth surface portion 66 to the outer side in the disc radial direction. The seventh surface portion 67 extends in parallel with the radial reference plane.

[0050] The first surface 61, the third surface 63, the fifth surface 65 and the seventh surface 67 face inward in the disc rotation direction, the second surface 62 and the sixth surface 66 face outward in the disc radial direction, and the fourth surface 64 faces inward in the disc radial direction.

[0051] The continuous second surface 62, third surface 63 and fourth surface 64 constitute an engagement recess 75 that is recessed outward in the disc rotation direction relative to the first surface 61 and fifth surface 65. The torque receiving portion 60 is a torque receiving surface of the engagement recess 75 that receives the braking torque of the second friction pad 27.

[0052] like Figure 5As shown, the torque bearing portion 60 of the fourth connection portion 52 has a snap-fitting recess 75 that is mirror-symmetrical with the torque bearing portion 60 of the third connection portion 51. The snap-fitting recess 75 of the third connection portion 51 and the snap-fitting recess 75 of the fourth connection portion 52 are opposed to each other in the direction of disk rotation, and are recessed in directions away from each other in the direction of disk rotation. The snap-fitting recess 75 of the third connection portion 51 and the snap-fitting recess 75 of the fourth connection portion 52 align the positions in the disk axis direction and also align the positions in the disk radius direction. The snap-fitting recess 75 of the third connection portion 51 penetrates the third connection portion 51 in the disk axis direction. The snap-fitting recess 75 of the fourth connection portion 52 penetrates the fourth connection portion 52 in the disk axis direction.

[0053] like Figure 4 As shown, the torque receiving portion 60 of the first connecting portion 46 has Figure 5 The torque receiving portion 60 of the third connecting portion 51 shown in the figure has the same engaging recess 75. Figure 4 As shown, the torque bearing portion 60 of the second connection portion 47 has a snap-in recess 75 that is mirror-symmetrical with the torque bearing portion 60 of the first connection portion 46. The snap-in recess 75 of the first connection portion 46 and the snap-in recess 75 of the second connection portion 47 are opposed to each other in the direction of disk rotation, and are recessed in directions away from each other in the direction of disk rotation. The snap-in recess 75 of the first connection portion 46 and the snap-in recess 75 of the second connection portion 47 align the positions in the disk axis direction and also align the positions in the disk radius direction. The snap-in recess 75 of the first connection portion 46 penetrates the first connection portion 46 in the disk axis direction. The snap-in recess 75 of the second connection portion 47 penetrates the second connection portion 47 in the disk axis direction.

[0054] Figure 5 The engaging recess 75 of the third connecting portion 51 is shown Figure 4 The engaging recessed portion 75 of the first connecting portion 46 shown here aligns the position in the disk radial direction and also aligns the position in the disk rotation direction. Figure 4 The engaging recess 75 of the second connecting portion 47 shown in FIG. Figure 5 The engaging recessed portion 75 of the fourth connecting portion 52 shown in the figure aligns the position in the disk radial direction and also aligns the position in the disk rotation direction.

[0055] like Figure 4 As shown, the inner side arrangement portion 31 of the mounting member 20 supports the first friction pad 26 through the engaging recess 75 provided on the first connecting portion 46 and the engaging recess 75 provided on the second connecting portion 47. Figure 5 As shown, the outer arrangement portion 32 of the mounting member 20 supports the second friction pad 27 via the engaging recess 75 provided on the third connecting portion 51 and the engaging recess 75 provided on the fourth connecting portion 52. Figure 4 The first fixing portion 42 and the first connecting portion 46 shown in FIG. Figure 5 The first connecting portion 33 and the third connecting portion 51 are arranged on the side where the disk rotates in the forward direction. Figure 4 The second fixing portion 44 and the second connecting portion 47 shown in FIG. Figure 5 The second connection portion 34 and the fourth connection portion 52 shown are arranged on the outward rotation side in the disk rotation direction during forward movement.

[0056] The first pad spring 24 and the second pad spring 25 are both integrally arranged on the mounting component 20. Figure 2 As shown, the first pad spring 24 is mounted on the side of the mounting component 20 that turns in the direction of rotation of the disk when moving forward. At this time, one first pad spring 24 is mounted on both the first connection portion 46 and the third connection portion 51 on the side that turns in the direction of rotation of the disk when moving forward. The second pad spring 25 is mounted on the side of the mounting component 20 that turns out in the direction of rotation of the disk when moving forward. At this time, one second pad spring 25 is mounted on both the second connection portion 47 and the fourth connection portion 52 on the side that turns out in the direction of rotation of the disk when moving forward. That is, two first pad springs 24 and second pad springs 25 are mounted on one mounting component 20. These first pad springs 24 and second pad springs 25 are mounted on the mounting component 20 to elastically support the first friction pad 26 and the second friction pad 27. In addition, 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 direction of the disk axis.

[0057] Figure 7 and Figure 8 The first pad spring 24 is shown in a natural state before being assembled to the mounting member 20 .

[0058] like Figure 7 As shown in FIG. 1 , the first pad spring 24 is mirror-symmetrical. The first pad spring 24 is formed by stamping a metal plate of a certain thickness. The first pad spring 24 has a pair of pad support portions 101, a connecting portion 102 connecting these pad support portions 101, and a snap-fit ​​portion 103 extending from the connecting portion 102. Figure 2 As shown, a pair of pad support portions 101 of the first pad spring 24 are arranged on both sides of the disk axial direction relative to the disk 11. The connecting portion 102 of the first pad spring 24 is arranged on the outer side of the disk radial direction relative to the disk 11. In other words, the first pad spring 24 is arranged between the pair of pad support portions 101.

[0059] like Figure 7 As shown in FIG. 1 , in the first pad spring 24 , a pair of pad support portions 101 are in mirror-symmetrical shapes. Therefore, one pad support portion 101 will be described.

[0060] The pad support portion 101 includes an outer end plate 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 are all flat plate-shaped.

[0061] The outer end plate portion 110 is located at an end portion on the coupling portion 102 side in the pad supporting portion 101 .

[0062] The outer plate portion 111 extends from the side of the outer end plate portion 110 opposite to the connecting portion 102 toward the side opposite to the connecting portion 102 substantially perpendicularly to the outer end plate portion 110 .

[0063] The outer support plate 112 extends substantially perpendicularly from the outer plate 111 on the opposite side of the outer end plate 110. The outer support plate 112 extends from the outer plate 111 to the same side as the outer end plate 110 in the thickness direction of the outer plate 111.

[0064] The wall plate 113 extends from the side of the outer support plate 112 opposite to the outer plate 111 substantially perpendicularly to the outer support plate 112. The wall plate 113 extends from the outer support plate 112 to the side opposite to the outer plate 111 in the thickness direction of the outer support plate 112.

[0065] like Figure 8 As shown in FIG. 1 , the wall plate portion 113 is a curved plate that is curved in the thickness direction. The wall plate portion 113 is curved in a convex shape on the side extending from the wall plate portion 113 to the outer support plate portion 112 in the thickness direction of the wall plate portion 113. Fig. 9 As shown, the wall plate portion 113 has a curved surface portion 117 curved with a radius R greater than 0 on the side of the outer supporting plate portion 112 in the thickness direction of the wall plate portion 113. In addition, the wall plate portion 113 also has a curved surface portion 118 curved with a radius greater than 0 on the side opposite to the outer supporting plate portion 112 in the thickness direction of the wall plate portion 113.

[0066] The extension plate portion 114 extends substantially perpendicularly to the wall plate portion 113 from the side of the wall plate portion 113 opposite to the outer support plate portion 112. The extension plate portion 114 extends from the wall plate portion 113 to the same side as the outer support plate portion 112 in the thickness direction of the wall plate portion 113. Figure 7 As shown, a middle opening 119 is formed in the extension plate portion 114. The middle opening 119 penetrates a predetermined range of the extension plate portion 114 on the wall plate portion 113 side in the thickness direction of the extension plate portion 114.

[0067] The inner plate portion 115 extends substantially perpendicularly from the side of the extension plate portion 114 opposite to the wall plate portion 113. The inner plate portion 115 extends from the extension plate portion 114 to the side opposite to the wall plate portion 113 in the thickness direction of the extension plate portion 114.

[0068] The engaging claw 116 protrudes from the wall plate portion 113 through the middle opening 119 to a position on the opposite side of the outer support plate portion 112 from the extension plate portion 114. 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 to the same side as the extension plate portion 114 in the thickness direction of the wall plate portion 113.

[0069] The boundary line between the outer end plate portion 110 and the outer side plate portion 111, the boundary line between the outer side plate portion 111 and the outer side support plate portion 112, the boundary line between the outer side 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 side plate portion 115 are parallel. The wall plate portion 113 is bent around an axis parallel to these boundary lines. The outer side plate portion 111 and the wall plate portion 113 extend in a manner that is substantially parallel to each other. Figure 8 As shown, the extension plate portion 114 is slightly inclined relative to the outer support plate portion 112 so as to extend farther away from the outer support plate portion 112 as it moves farther away from the wall plate portion 113 .

[0070] 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.

[0071] The continuous outer support plate portion 112 , the wall plate portion 113 , and the extension plate portion 114 are connected as a whole to be concave with respect to the outer plate portion 111 and the inner plate portion 115 , thereby constituting a guide recess 120 (second support portion).

[0072] The pad support portion 101 has a spring plate portion 121 (third support portion). The spring plate portion 121 extends from the end edge portion of the extension plate portion 114 of the pad support portion 101 on the opposite side to the other pad support portion 101 to the side opposite to the other pad support portion 101, then folds back toward the outer support plate portion 112 in the thickness direction of the extension plate portion 114 and extends toward the other pad support portion 101.

[0073] The spring plate portion 121 has a bent plate portion 122 and an inner support plate portion 123. The bent plate portion 122 is bent in a substantially cylindrical shape. In one pad support portion 101, the bent plate portion 122 extends from the end edge portion of the extension plate portion 114 on the opposite side to the pad support portion 101 on the other side. In one pad support portion 101, the bent plate portion 122 extends from the extension plate portion 114 in the thickness direction of the extension plate portion 114 to approach the outer support plate portion 112 and to extend away from the pad support portion 101 on the other side. Thereafter, the bent plate portion 122 approaches the outer support plate portion 112 in the thickness direction of the extension plate portion 114 and extends in a direction close to the pad support portion 101 on the other side. Thereafter, the bent plate portion 122 leaves the outer support plate portion 112 in the thickness direction of the extension plate portion 114 and extends in a direction close to the pad support portion 101 on the other side.

[0074] In the pad support portion 101 on one side, the inner support plate portion 123 extends linearly from the end edge portion of the curved plate portion 122 on the opposite side of the end edge portion of the side continuous with the extension plate portion 114 toward the other pad support portion 101. In the pad support portion 101 on one side, the inner support plate portion 123 extends from the curved plate portion 122 in a manner that the closer it is to the pad support portion 101 on the other side, the farther it is from the extension plate portion 114 in the thickness direction of the extension plate portion 114. The spring plate portion 121 is elastically deformed mainly in the curved plate portion 122.

[0075] The pad support portion 101 has a spring plate portion 131 (first support portion). The spring plate portion 131 extends from an end edge portion of the outer plate portion 111 of the pad support portion 101 on the opposite side to the other pad support portion 101 to the side opposite to the other pad support portion 101, then folds back in the thickness direction of the outer plate portion 111 to the side opposite to the wall plate portion 113 and extends to the side of the other pad support portion 101.

[0076] The spring plate portion 131 includes a bent plate portion 132 and a support plate portion 133. The bent plate portion 132 is bent in a substantially cylindrical shape. In one pad support portion 101, the bent plate portion 132 extends from the end edge portion of the outer plate portion 111 on the opposite side to the pad support portion 101 on the other side. In one pad support portion 101, the bent plate portion 132 extends from the outer plate portion 111 in the thickness direction of the outer plate portion 111 to the same side as the outer support plate portion 112 and in a direction away from the pad support portion 101 on the other side. Thereafter, the bent plate portion 132 extends in the thickness direction of the outer plate portion 111 in a direction opposite to the outer support plate portion 112 and in a direction away from the pad support portion 101 on the other side. Thereafter, the bent plate portion 132 extends in the thickness direction of the outer plate portion 111 in a direction opposite to the outer support plate portion 112 and in a direction close to the pad support portion 101 on the other side.

[0077] In the pad support portion 101 on one side, the support plate portion 133 extends from the end edge portion of the curved plate portion 132 on the opposite side of the end edge portion of the side continuous with the outer plate portion 111 toward the direction of the pad support portion 101 on the other side. In the pad support portion 101 on one side, the support plate portion 133 extends from the curved plate portion 132 in a manner that the closer to the other pad support portion 101 side, the farther away from the outer plate portion 111 in the thickness direction of the outer plate portion 111. In the pad support portion 101 on one side, the support plate portion 133 is curved in an arc shape with the axis of the support plate portion 133 on the side opposite to the outer plate portion 111 in the thickness direction and extending perpendicularly to the outer support plate portion 112 as the center.

[0078] The first pad spring 24 has a pair of pad support portions 101 in a mirror-symmetrical manner.

[0079] The connection portion 102 includes a base end connection plate portion 141, an intermediate connection plate portion 142, and a front end plate portion 143. The base end connection plate portion 141, the intermediate connection plate portion 142, and the front end plate portion 143 are all in the shape of a flat plate.

[0080] The base end connecting plate portion 141 is arranged in the same plane as the outer end plate portions 110 of the pair of pad support portions 101 and connects them. The base end connecting plate portion 141 connects the end edges of the pair of outer end plate portions 110 on the opposite side to the outer plate portion 111 .

[0081] The intermediate connecting plate portion 142 extends from an end edge portion of the base end connecting plate portion 141 on the opposite side to the pair of outer end plate portions 110 to a side opposite to the pair of outer end plate portions 111 in the thickness direction of the base end connecting plate portion 141 .

[0082] The front end plate portion 143 extends from the end edge portion of the intermediate connecting plate portion 142 on the opposite side to the base end connecting plate portion 141 in the thickness direction of the intermediate connecting plate portion 142 to the side opposite to the base end connecting plate portion 141. The front end plate portion 143 extends in a manner that the farther away from the intermediate connecting plate portion 142, the farther away from the base end connecting plate portion 141 in the thickness direction of the base end connecting plate portion 141.

[0083] The engaging portion 103 includes a base plate portion 145 and a pair of engaging protrusions 146 .

[0084] The base plate portion 135 extends from a position between a pair of outer end plates 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 then folds back in the thickness direction of the base end connecting plate portion 141 to the side opposite to the intermediate connecting plate portion 142. Thereafter, the base plate portion 135 is separated from the pair of outer plate portions 111 in the thickness direction of the intermediate connecting plate portion 142, and extends in a manner away from the intermediate connecting plate portion 142 in the thickness direction of the base end connecting plate portion 141.

[0085] A pair of engaging protrusions 146 are provided at the end of the substrate 145 on the opposite side to the base end connecting plate 141. One engaging protrusion 146 protrudes from the end edge of the outer end plate 110 side of one side of the substrate 145, and the other engaging protrusion 146 protrudes from the end edge of the outer end plate 110 side of the other side of the substrate 145. The pair of engaging protrusions 146 protrude to the side opposite to the base end connecting plate 141 in the thickness direction of the substrate 145. The distance between the pair of engaging protrusions 146 increases as they are farther from the substrate 145.

[0086] 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 front end plate portion 143 , the boundary line between the base end connecting plate portion 141 and the base plate portion 145 , and the boundary line between the outer end plate portion 110 and the outer side plate portion 111 are parallel.

[0087] Fig.10 The second pad spring 25 is shown in its natural state before being assembled to the mounting member 20. Figure 7 and Figure 8 The first pad spring 24 shown is partially different.

[0088] The second pad spring 25 is mirror-symmetrical. The second pad spring 25 is formed by stamping a metal plate of a certain thickness. The second pad spring 25 has a pair of pad support portions 101A that are partially different from the pair of pad support portions 101 instead of the pair of pad support portions 101. Figure 7 Either one of the pair of spring plate portions 131 shown.

[0089] like Fig.10As shown, the pad support portion 101A has a guide recess 120A that is partially different from the guide recess 120 instead of the guide recess 120. The guide recess 120A has a wall plate portion 113A that is different from the wall plate portion 113 instead of the wall plate portion 113. The wall plate portion 113A is a flat plate extending approximately perpendicularly to the outer support plate portion 112 and the extension plate portion 114. That is, the wall plate portion 113A has a flat plane portion 117A on the side of the outer support plate portion 112 in the thickness direction of the wall plate portion 113A. In addition, the wall plate portion 113A also has a flat plane portion 118A on the side opposite to the outer support plate portion 112 in the thickness direction of the wall plate portion 113A.

[0090] The other structures of the second pad spring 25 are the same as those of the Figure 7 and Figure 8 The first pad springs 24 shown are identical.

[0091] like Figure 2 As shown, the first pad spring 24 is mounted on the first connection portion 46 and the third connection portion 51 of the mounting member 20, both of which are on the side where the disk rotates in the forward direction. At this time, the first pad spring 24 is in a state where the connecting portion 102 is arranged at a position outside the pad support portion 101 in the disk radial direction. In addition, at this time, Figure 5 As shown, the first pad spring 24 engages the guide recess 120 of the pad support portion 101 with the engagement recess 75 of the third connecting portion 51, and as shown Figure 4 As shown, the guide recess 120 of the pad support portion 101 on the other side is engaged with the engagement recess 75 of the first connection portion 46. As a result, the first pad spring 24 is arranged on the mounting member 20 in a manner that movement in the disc radial direction and in the disc rotation direction when moving forward is restricted. Figure 3 As shown, the first pad spring 24 makes the engaging protrusion 146 of one side of the engaging portion 103 abut against the surface of the first connecting portion 46 on the third connecting portion 51 side, and makes the engaging protrusion 146 of the other side abut against the surface of the third connecting portion 51 on the first connecting portion 46 side. Thus, the first pad spring 24 is provided on the mounting member 20 in a manner that movement in the disc axis direction is restricted. In other words, the first pad spring 24 is positioned and mounted relative to the mounting member 20 in the disc radial direction, the disc rotation direction, and the disc axis direction.

[0092] Therefore, if Figure 2 As shown, the first pad spring 24 is in a state where a pair of pad support portions 101 are arranged on both sides of the disk 11 in the disk axis direction. Figure 4 The guide recess 120 and the spring plate portion 121 of the pad support portion 101 are arranged in the engagement recess 75 of the first connection portion 46 of the mounting member 20. Figure 5The guide recess 120 and the spring plate portion 121 of the other pad support portion 101 are shown in a state where they are arranged in the engagement recess 75 of the third connection portion 51 of the mounting member 20 .

[0093] The first pad spring 24 arranged on the side where the disk rotates forward when installed on the first connection portion 46 and the third connection portion 51 has a pair of guide recesses 120 that engage with a pair of engaging recesses 75 and are recessed outward in the disk rotation direction.

[0094] For the first pad spring 24 installed on the mounting member 20, Figure 5 The outer pad support portion 101 shown is engaged with the torque receiving portion 60 of the third connecting portion 51. Figure 4 The inner pad support portion 101 shown is engaged with the torque receiving portion 60 of the first connecting portion 46. For the first pad spring 24, Figure 5 The outer pad support portion 101 shown is engaged with the torque receiving portion 60 of the third connection portion 51, and Figure 4 The engagement state of the inner pad support portion 101 and the torque receiving portion 60 of the first connecting portion 46 is the same. Figure 6 The engagement state between the pad support portion 101 on the outer side of the first pad spring 24 and the third connection portion 51 will be described.

[0095] For the pad support portion 101 on the outer side of the first pad spring 24, the wall plate portion 113 of the guide recess 120 is arranged on the outer side of the guide recess 120 in the disk rotation direction. At this time, the wall plate portion 113 of the guide recess 120 is opposite to the third face portion 63 on the inner side of the recessed direction of the engaging recess 75, and abuts against the third face portion 63. In this state, the wall plate portion 113 extends roughly parallel to the radial reference plane like the third face portion 63. The wall plate portion 113 is bent as described above, the outer end portion in the disk radial direction abuts against the third face portion 63, and the middle portion in the disk radial direction is separated from the third face portion 63 in the disk rotation direction. The inner end portion in the disk radial direction of the wall plate portion 113 has a gap with the third face portion 63 that is smaller than the middle portion in the disk radial direction.

[0096] In addition, for the pad support portion 101 on the outer side of the first pad spring 24, the outer support plate portion 112 of the guide recess 120 is arranged on the outer side of the guide recess 120 in the disc radial direction. At this time, the outer support plate portion 112 of the guide recess 120 is opposite to the fourth face portion 64 on the outer side of the engagement recess 75 in the disc radial direction, and is in surface contact with the fourth face portion 64. At this time, the outer support plate portion 112 extends perpendicularly to the radial reference line along the disc axis like the fourth face portion 64.

[0097] In addition, for the pad support portion 101 outside the first pad spring 24, the extension plate portion 114 of the guide recess 120 is arranged inside the guide recess 120 in the disc radial direction. At this time, the extension plate portion 114 of the guide recess 120 is opposite to the second surface portion 62 inside the engagement recess 75 in the disc radial direction, and is in surface contact with the second surface portion 62. In this state, the extension plate portion 114 extends substantially perpendicularly to the radial reference line along the disc axis direction in the same manner as the second surface portion 62.

[0098] In addition, for the pad support portion 101 outside the first pad spring 24, Figure 7 The engagement claw 116 shown in FIG. 1 is arranged on the inner side of the guide recess 120 in the disk radial direction. Figure 6 The second surface portion 62 of the engaging recess 75 shown abuts against the engaging recess and elastically deforms outward in the disc radial direction.

[0099] In addition, in the pad support portion 101 outside the first pad spring 24 , the inner plate portion 115 extends from the extension plate portion 114 toward the inside in the disk radial direction, and faces the first surface portion 61 in the disk rotation direction.

[0100] In addition, in the outer pad support portion 101 of the first pad spring 24 , the outer plate portion 111 extends outward in the disk radial direction from the outer support plate portion 112 and faces the fifth surface portion 65 in the disk rotation direction.

[0101] As described above, for the pad support portion 101 outside the first pad spring 24, the guide recess 120 is fitted with the engagement recess 75. At this time, the pad support portion 101 abuts against the engagement recess 75 at the outer support plate portion 112, the wall plate portion 113, the extension plate portion 114 and the engagement claw 116.

[0102] For the pad support portion 101 on the outer side of the first pad spring 24, the outer support plate portion 112 extends from the outer edge portion of the wall plate portion 113 in the disk radial direction, and the extension plate portion 114 extends from the inner edge portion of the wall plate portion 113 in the disk radial direction toward the inner side of the disk rotation direction. The outer support plate portion 112, the wall plate portion 113, and the extension plate portion 114 all extend along the disk axis direction.

[0103] In addition, for the pad support portion 101 on the outer side of the first pad spring 24, the bent plate portion 122 of the spring plate portion 121 is provided on the side of the extension plate portion 114 opposite to the disk 11 in the disk axis direction. The bent plate portion 122 extends from the extension plate portion 114 to the opposite side relative to the disk 11 and then folds back to the outer side in the disk radius direction. Figure 7 The inner supporting plate portion 123 shown extends from the bent plate portion 122 in a manner approaching the disk 11 in the disk axis direction.

[0104] In addition, for the pad support portion 101 on the outside of the first pad spring 24, the bent plate portion 132 of the spring plate portion 131 is provided on the side of the outer plate portion 111 opposite to the disk 11 in the disk axis direction. The bent plate portion 132 extends from the outer plate portion 111 to the opposite side relative to the disk 11 and then folds back inward in the disk rotation direction. Figure 7 The support plate portion 133 shown is extended from the bent plate portion 132 in a manner approaching the disk 11 in the disk axis direction.

[0105] like Figure 6 As shown, with respect to the pad support portion 101 on the outer side 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 connection portion 51 .

[0106] In the pad support portion 101 outside the first pad spring 24 , the wall plate portion 113 is offset in the disk radial direction relative to the spring plate portion 131 , and more specifically, is offset inward in the disk radial direction relative to the spring plate portion 131 .

[0107] For the first pad spring 24 installed on the mounting member 20, Figure 4 The inner pad support portion 101 shown is the same Figure 6 The engagement of the outer pad support portion 101 shown with the torque receiving portion 60 of the third connection portion 51 is similar to the engagement with the torque receiving portion 60 of the first connection portion 46 .

[0108] When the first pad spring 24 is mounted on the mounting member 20, the middle connecting plate portion 142 and the front end plate portion 143 of the connecting portion 102 are connected to each other. Figure 7 The end edge of the base end connecting plate portion 141 shown in FIG. 1 is located on the opposite side to the pair of outer end plates 110 and extends outward in the disk radial direction. Figure 6 As shown, the intermediate connecting plate portion 142 and the seventh surface portion 67 are opposed to each other in the disk rotation direction.

[0109] like Figure 2 As shown, the second pad spring 25 is mounted to the second connection portion 47 and the fourth connection portion 52 of the mounting member 20 on the outward side in the forward disk rotation direction in substantially the same manner as the first pad spring 24 is mounted to the first connection portion 46 and the third connection portion 51 .

[0110] For the second pad spring 25 installed on the mounting member 20, Figure 5 The outer pad support portion 101A shown in FIG. 1 is engaged with the torque receiving portion 60 of the fourth connecting portion 52. Figure 4The inner pad support portion 101A shown is engaged with the torque receiving portion 60 of the second connecting portion 47 .

[0111] However, at this time, Figure 5 As shown, the flat plate-shaped wall plate portion 113A on the outer side of the second pad spring 25 abuts against the third surface portion 63 of the fourth connecting portion 52 in a surface contact manner, as shown in FIG. Figure 4 As shown, the inner flat plate-shaped wall plate portion 113A abuts against the third surface portion 63 of the second connection portion 47 in a surface-contact manner.

[0112] In this manner, the first pad spring 24 and the second pad spring 25 are mounted on the mounting member 20 so as to face each other in the disk rotation direction in a state where they are separated in the disk rotation direction.

[0113] Figure 4 The first friction pad 26 and Figure 5 The second friction pad 27 shown is engaged with the first pad spring 24 and the second pad spring 25 installed on the mounting member 20. Figure 4 As shown, the first friction pad 26 is supported by the first connection portion 46 and the second connection portion 47 of the mounting member 20 via the first pad spring 24 and the second pad spring 25. Figure 5 As shown, the second friction pad 27 is supported by the third connection portion 51 and the fourth connection portion 52 of the mounting member 20 via the first pad spring 24 and the second pad spring 25. The first friction pad 26 and the second friction pad 27 have their length directions aligned with the disc rotation direction.

[0114] Figure 4 The first friction pad 26 on the inner side is shown Figure 5 The outer second friction pad 27 is shown as a substantially identically shaped component.

[0115] like Figure 2 As shown, 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 lining 173 of a common shape. The lining 173 is adhered to one side of the back plate 171 and the back plate 172 in the thickness direction. The length direction of the back plate 171 of the first friction pad 26 is the length direction. The length direction of the back plate 172 of the second friction pad 27 is the length direction. For the first friction pad 26, in a state where the lining 173 is opposed to the disc 11, the back plate 171 is supported by the mounting member 20 via the first lining spring 24 and the second lining spring 25. For the second friction pad 27, in a state where the lining 173 is opposed to the disc 11, the back plate 172 is supported by the mounting member 20 via the first lining spring 24 and the second lining spring 25.

[0116] The back plate 171 of the first friction pad 26 is in a mirror-symmetrical shape.

[0117] like Figure 4 As shown, the back plate 171 has a main body portion 175 and a pair of protrusions 176 .

[0118] The main body 175 is disposed at the center of the length direction of the back plate 171. The main body 175 is longer in the length direction of the back plate 171. Figure 2 As shown, a lining sheet 173 is attached to the main body 175. The lining sheet 173 also has a mirror-symmetrical shape.

[0119] like Figure 4 As shown, a pair of mounting holes 181 penetrating the main body 175 in the thickness direction are formed on both sides in the length direction of the main body 175. The pair of mounting holes 181 are formed at positions of the main body 175 where the lining 173 is not attached. A wear sensor 183 is mounted on a predetermined side of the pair of mounting holes 181 by a rivet 182. The wear sensor 183 is mounted on a surface of the main body 175 on the opposite side to the lining 173 in the thickness direction, and extends from the surface of the lining 173 side of the main body 175 in the thickness direction to the lining 173 side through the outside of the main body 175. The main body 175 has a pair of end faces 184 at both ends in the length direction. The pair of end faces 184 are parallel to each other.

[0120] The pair of protrusions 176 of the back plate 171 are also mirror-symmetrical in shape. One protrusion 176 is provided at one end in the longitudinal direction of the back plate 171. The other protrusion 176 is provided at the other end in the longitudinal direction of the back plate 171. One protrusion 176 of the pair of protrusions 176 protrudes outward from an end surface 184 on one end side in the longitudinal direction of the main body 175 along the longitudinal direction of the main body 175, and the other protrusion 176 of the pair of protrusions 176 protrudes outward from an end surface 184 on the other end side in the longitudinal direction of the main body 175 along the longitudinal direction of the main body 175. Therefore, the pair of protrusions 176 protrude in opposite directions from both ends in the longitudinal direction of the main body 175 along the longitudinal direction of the main body 175.

[0121] Figure 5 The back plate 172 of the second friction pad 27 shown in the figure has a main body portion 185 that is partially different from the main body portion 175. The main body portion 185 is different from the main body portion 175 in that the pair of mounting holes 181 are not formed.

[0122] The back plate 172 has a pair of protruding portions 176 similar to the back plate 171 .

[0123] Figure 4 The protrusion 176 of the first friction pad 26 shown in the figure is on the side of the disc rotation direction when the first friction pad 26 is forward. Figure 5The protrusion 176 on the outward side of the second friction pad 27 in the forward direction of the disc rotation direction is of the same shape. Figure 4 The protrusion 176 of the first friction pad 26 shown in the figure is on the outward side of the disc rotation direction when advancing. Figure 5 The protrusion 176 of the second friction pad 27 shown in the figure on the side of the disc rotation direction when moving forward is the same shape. Figure 6 The following description will be made by taking the protrusion 176 on the disc rotation direction inward turning side of the second friction pad 27 when moving forward as an example.

[0124] The protrusion 176 of the second friction pad 27 on the disc rotation direction inward side during forward movement has an inner side surface 191, an outer side surface 192 and a front end surface 193. The inner side surface 191, the outer side surface 192 and the front end surface 193 are all planar and extend in the thickness direction of the back plate 171.

[0125] Both the inner side surface portion 191 and the outer side surface portion 192 extend from the main body portion 185 along the length direction of the back plate 171. The outer side surface portion 192 extends from one end side of the end surface 184 of the main body portion 185. The outer side surface portion 192 is parallel to the inner side surface portion 191 and faces in the opposite direction to the inner side surface portion 191. The front end surface portion 193 is located at the end on the opposite side of the main body portion 185 in the length direction of the back plate 171. The front end surface portion 193 extends vertically relative to the inner side surface portion 191 and the outer side surface portion 192. A mounting hole 194 is formed in the protrusion 176 and passes through the protrusion 176 in the thickness direction. As shown in FIG. Figure 5 As shown, a return spring 196 is installed in the mounting hole 194 by means of a rivet 195. Figure 2 As shown, the return spring 196 is attached to the surface of the protrusion 176 on the opposite side to the lining 173 in the thickness direction.

[0126] like Figure 5 As shown, the protrusion 176 of the second friction pad 27 on the disc rotation direction inward side when moving forward is engaged with the pad support portion 101 installed on the outer side of the third connection portion 51 of the first pad spring 24. The protrusion 176 of the second friction pad 27 on the disc rotation direction outward side when moving forward is engaged with the pad support portion 101A installed on the outer side of the fourth connection portion 52 of the second pad spring 25. As a result, the length direction of the second friction pad 27 is consistent with the disc rotation direction.

[0127] Here, when the second friction pad 27 is installed on the mounting member 20 via the first pad spring 24 and the second pad spring 25, the protrusion 176 on the disc rotation direction inward side of the second friction pad 27 when moving forward is located between the inner side surface 191 on the inner side in the disc radial direction and the spring plate portion 121 on the outer side of the first pad spring 24. Figure 7The inner support plate portion 123 shown in the figure abuts against the inner support plate portion 123, so that the inner support plate portion 123 is elastically deformed inward in the disk radial direction in a manner close to the extension plate portion 114, and the first pad spring 24 is inserted. Figure 5 At this time, the end surface 184 of the main body 185 of the second friction pad 27 on the side of the disc rotation direction when moving forward is in contact with the outer spring plate portion 131 of the first pad spring 24. Figure 7 The support plate portion 133 shown in the figure abuts against the support plate portion 133, so that the support plate portion 133 is elastically deformed toward the outside in the disk rotation direction in a manner close to the outer plate portion 111. In addition, at this time, Figure 5 The protrusion 176 of the second friction pad 27 shown in the figure on the outward side of the disc rotation direction during forward movement is located at the inner side surface 191 on the inner side of the disc radial direction and at the inner side support plate portion 123 of the spring plate portion 121 on the outer side of the second pad spring 25 (see Fig.10 ) abuts against the inner support plate portion 123, so that the inner support plate portion 123 elastically deforms inwardly in the disk radial direction in a manner close to the extension plate portion 114, such as Figure 5 As shown, the fourth connecting portion 52 is inserted into the guide recess 120A provided in the fourth connecting portion 52 .

[0128] Thus, the protrusion 176 of the second friction pad 27 on the disc rotation direction inward rotation side during forward movement is inserted into the engaging recess 75 of the third connection part 51 of the mounting member 20 and supported by the third connection part 51. At the same time, the protrusion 176 of the second friction pad 27 on the disc rotation direction outward rotation side during forward movement is inserted into the engaging recess 75 of the fourth connection part 52 of the mounting member 20 and supported by the fourth connection part 52.

[0129] In this state, the protrusion 176 of the second friction pad 27 on the disc rotation direction turning side when advancing is pressed outward in the disc radial direction by the 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.

[0130] In addition, in this state, the main body 185 of the second friction pad 27 is pressed toward the outward side of the disc rotation direction when advancing by the 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.

[0131] In addition, in this state, the protrusion 176 on the outward side of the disc rotation direction when the second friction pad 27 moves forward is pressed outward in the disc radial direction by the 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.

[0132] As described above, the second friction pad 27 is urged toward the outer side of the disc radius direction by the force of the spring plate portion 121 on the outer side of the first pad spring 24 and the spring plate portion 121 on the outer side of the second pad spring 25. When the second friction pad 27 is urged in this way, when there is no input from the disc 11, the protrusion 176 on the disc rotation direction inward side is pressed against the outer support plate portion 112 of the guide recess 120 on the outer side of the first pad spring 24 at the outer side surface 192 to make surface contact.

[0133] In this state, the protrusion 176 of the second friction pad 27 on the outward side in the disc rotation direction during forward movement is pressed against the outer support plate portion 112 of the outer guide recess 120 of the second pad spring 25 at the outer side surface portion 192 for surface contact.

[0134] In this state, the protrusion 176 of the second friction pad 27 on the disc rotation direction entering side during forward movement is supported by the outer guide recess 120 of the first pad spring 24 so as to be movable in the disc axis direction.

[0135] In this state, the protrusion 176 of the second friction pad 27 on the outward-turning side in the disc rotation direction during forward movement is supported by the outer guide recess 120 of the second pad spring 25 so as to be movable in the disc axial direction.

[0136] With respect to the second friction pad 27 which is urged toward the side in the disc rotation direction when forward by the force of the spring plate portion 131 on the outer side of the first pad spring 24, when there is no input from the disc 11, the protrusion 176 on the side in the disc rotation direction when forward is pressed against the wall plate portion 113A of the guide recess 120A on the outer side of the second pad spring 25 at the front end surface portion 193 at the outer end in the disc rotation direction to make surface contact.

[0137] In addition, in this state, if Figure 6 As shown, when the second friction pad 27 is in the forward position, the front end surface portion 193 of the protrusion 176 on the side where the disk rotation direction turns in does not contact the wall plate portion 113 of the guide recess 120 on the outer side of the first pad spring 24, and there is a gap S in the disk rotation direction between the wall plate portion 113.

[0138] The guide recess 120 on the outer side of the first pad spring 24 has a wall plate portion 113 bent from the third surface portion 63 of the torque receiving portion 60 of the third connecting portion 51 toward the second friction pad 27. The wall plate portion 113 also elastically supports the second friction pad 27 in the disk rotation direction when the front end surface portion 193 of the protrusion 176 on the disk rotation direction inward side of the second friction pad 27 abuts. Here, with respect to the spring plate portion 131 and the wall plate portion 113 on either outer side of the first pad spring 24, the spring constant of the spring plate portion 131 is smaller than the spring constant of the wall plate portion 113.

[0139] As in Fig.11 As schematically shown in FIG. 1 , the disc brake 10 is in a first state in which one of the outer spring plate portion 131 of the first pad spring 24 and the wall plate portion 113 is in contact with the second friction pad 27, and the other has a gap S between the second friction pad 27 and the second friction pad 27. The outer spring plate portion 131 of the first pad spring 24 is arranged on the outer side of the disc radial direction compared with the outer wall plate portion 113. The first state is a state in which the second friction pad 27 is supported by the outer spring plate portion 131 of the first pad spring 24 and has a gap S between the outer wall plate portion 113 of the first pad spring 24.

[0140] The first pad spring 24 includes a spring plate portion 121 that abuts against the second friction pad 27 on the outside and supports the second friction pad 27 on the outside in the disc radial direction. When the vehicle is braked in reverse, the bend vertex of the outer wall plate portion 113 of the first pad spring 24 abuts against the center of the protrusion 176 on the outward side of the disc rotation direction when the second friction pad 27 moves backward in the direction of the disc radial direction reference line.

[0141] like Figure 4 As shown, the protrusion 176 on the disc rotation direction inward side of the first friction pad 26 when moving forward is engaged with the pad support portion 101 installed on the inner side of the first connection portion 46 of the first pad spring 24. The protrusion 176 on the disc rotation direction outward side of the first friction pad 26 when moving forward is engaged with the pad support portion 101A installed on the inner side of the second connection portion 47 of the second pad spring 25. As a result, the length direction of the first friction pad 26 is consistent with the disc rotation direction.

[0142] Here, when the first friction pad 26 is mounted on the mounting member 20 via the first pad spring 24 and the second pad spring 25, the protrusion 176 on the disc rotation direction inward side of the first friction pad 26 when moving forward is similar to the second friction pad 27, and the inner side surface 191 on the inner side of the disc radial direction is aligned with the inner spring plate 121 of the first pad spring 24. Figure 7 The inner support plate portion 123 shown in the figure abuts against the inner support plate portion 123, causing the inner support plate portion 123 to elastically deform in a manner close to the extension plate portion 114, and inserting Figure 4 At this time, the end surface 184 of the main body 175 of the first friction pad 26 on the side of the disc rotation direction when moving forward and the spring plate portion 131 on the inner side of the first pad spring 24 are aligned. Figure 7 The support plate portion 133 shown in the figure abuts against the support plate portion 133, so that the support plate portion 133 is elastically deformed toward the outside in the disk rotation direction in a manner close to the outer plate portion 111. In addition, at this time, Figure 4 The protrusion 176 of the first friction pad 26 shown in the figure is on the outward side of the disc rotation direction when advancing, and the inner side surface 191 of the inner side of the disc radial direction is connected to the inner spring plate 121 of the second pad spring 25. Fig.10 The inner support plate portion 123 shown comes into contact with the extending plate portion 114 , and the inner support plate portion 123 is elastically deformed so as to approach the extending plate portion 114 , and is inserted into the guide recess 120A of the second connecting portion 47 .

[0143] Thus, the protrusion 176 of the first friction pad 26 on the disc rotation direction inward rotation side during forward movement is inserted into the engaging recess 75 of the first connecting portion 46 of the mounting member 20 and is supported by the first connecting portion 46. At the same time, the protrusion 176 of the first friction pad 26 on the disc rotation direction outward rotation side during forward movement is inserted into the engaging recess 75 of the second connecting portion 47 of the mounting member 20 and is supported by the second connecting portion 47.

[0144] In this state, the protrusion 176 on the disc rotation direction turning side of the first friction pad 26 when moving forward is pressed outward in the disc radial direction by the force of the spring plate portion 121 on the inner side of the first pad spring 24. In other words, the spring plate portion 121 on the inner side of the first pad spring 24 elastically supports the first friction pad 26 in the disc radial direction.

[0145] In addition, in this state, the main body 175 of the first friction pad 26 is pressed toward the outward side of the disc rotation direction when advancing by the force of the spring plate portion 131 inside the first pad spring 24. In other words, the spring plate portion 131 inside the first pad spring 24 elastically supports the first friction pad 26 in the disc rotation direction.

[0146] In addition, in this state, the protrusion 176 on the outward side of the disc rotation direction when the first friction pad 26 moves forward is pressed outward in the disc radial direction by the force of the spring plate portion 121 on the inner side of the second pad spring 25. In other words, the spring plate portion 121 on the inner side of the second pad spring 25 elastically supports the first friction pad 26 in the disc radial direction.

[0147] As described above, the first friction pad 26 is urged outward in the disc radial direction by the action of the spring plate portion 121 on the inner side of the first pad spring 24 and the spring plate portion 121 on the inner side of the second pad spring 25. When the first friction pad 26 urged in this way has no input from the disc 11, the protrusion 176 on the disc rotation direction inward side is pressed against the outer support plate portion 112 of the guide recess 120 on the inner side of the first pad spring 24 at the outer side surface 192 to make surface contact.

[0148] In this state, the protrusion 176 of the first friction pad 26 on the outward side in the disc rotation direction during forward movement is pressed against the outer support plate portion 112 of the guide recess 120 inside the second pad spring 25 at the outer surface portion 192 for surface contact.

[0149] In this state, the protrusion 176 of the first friction pad 26 on the disc rotation direction entering side during forward movement is supported by the guide recess 120 inside the first pad spring 24 so as to be movable in the disc axis direction.

[0150] In this state, the protrusion 176 of the first friction pad 26 on the outward-turning side in the disc rotation direction during forward movement is supported by the guide recess 120 inside the second pad spring 25 so as to be movable in the disc axial direction.

[0151] With respect to the first friction pad 26 which is urged toward the side in which the disk rotates forward during forward movement by the force of the spring plate portion 131 on the inner side of the first pad spring 24, when there is no input from the disk 11, the protrusion 176 on the side in which the disk rotates forward during forward movement is pressed against the wall plate portion 113A of the guide recess 120A on the inner side of the second pad spring 25 at the front end surface portion 193 at the outer end in the direction of disk rotation to make surface contact.

[0152] In addition, in this state, the front end surface 193 of the protrusion 176 of the first friction pad 26 on the side turning in the direction of disk rotation when moving forward does not contact the wall plate portion 113 of the guide recess 120 on the inner side of the first pad spring 24, and there is a gap between the wall plate portion 113 in the direction of disk rotation.

[0153] The guide recess 120 on the inner side of the first pad spring 24 has a wall plate portion 113 bent from the third surface portion 63 of the torque receiving portion 60 of the first connecting portion 46 toward the first friction pad 26. The wall plate portion 113 also elastically supports the first friction pad 26 in the disk rotation direction when the front end surface portion 193 of the protrusion 176 on the disk rotation direction inward side of the first friction pad 26 abuts. Here, with respect to the spring plate portion 131 and the wall plate portion 113 on the inner side of the first pad spring 24, the spring constant of the spring plate portion 131 is smaller than the spring constant of the wall plate portion 113.

[0154] The above-described state of the disc brake 10 is a first state in which one of the inner spring plate portion 131 and the wall plate portion 113 of the first pad spring 24 abuts against the first friction pad 26, and the other has a gap with the first friction pad 26. The inner spring plate portion 131 of the first pad spring 24 is arranged on the outer side in the disc radial direction compared with the inner wall plate portion 113. The first state is a state in which the first friction pad 26 is supported by the inner spring plate portion 131 of the first pad spring 24 and has a gap S with the inner wall plate portion 113 of the first pad spring 24.

[0155] The first pad spring 24 includes a spring plate portion 121 that abuts against the first friction pad 26 on the inner side and supports the first friction pad 26 on the outer side in the disc radial direction. When the vehicle is braked in reverse, the bend vertex of the inner wall plate portion 113 of the first pad spring 24 abuts against the center of the protrusion 176 on the outward side of the disc rotation direction when the first friction pad 26 moves backward in the direction of the disc radial direction reference line.

[0156] like Figure 2 As shown, the outer second friction pad 27 is in a state where the lining 173 is opposed to the outer second braking surface 11b of the disk 11. The inner first friction pad 26 is in a state where the lining 173 is opposed to the inner first braking surface 11a of the disk 11. The second friction pad 27 is in contact with the second braking surface 11b of the disk 11 at the surface of the lining 173 on the opposite side to the back plate 172. The first friction pad 26 is in contact with the first braking surface 11a of the disk 11 at the surface of the lining 173 on the opposite side to the back plate 171.

[0157] like Figure 4 As shown, the wear sensor 183 mounted on the inner first friction pad 26 is arranged on the inward turning side of the first friction pad 26 in the disc rotation direction during forward movement.

[0158] A pair of return springs 196 provided on the inner first friction pad 26 are arranged on both end sides of the first friction pad 26 in the disc rotation direction. The return spring 196 installed on the disc rotation direction turning-in side when the first friction pad 26 moves forward abuts against the surface of the first connecting portion 46 on the side opposite to the disc 11 in the disc axis direction. The return spring 196 installed on the disc rotation direction turning-in side when the first friction pad 26 moves forward abuts against the surface of the second connecting portion 47 on the side opposite to the disc 11 in the disc axis direction. These return springs 196 apply force to the first friction pad 26 moving toward the disc 11 side in the disc axis direction in a direction away from the disc 11.

[0159] like Figure 5As shown, a pair of return springs 196 provided on the outer second friction pad 27 are arranged on both end sides of the second friction pad 27 in the disc rotation direction. The return spring 196 installed on the disc rotation direction inward side when the second friction pad 27 moves forward abuts against the surface of the third connecting portion 51 on the side opposite to the disc 11 in the disc axis direction. The return spring 196 installed on the disc rotation direction outward side when the second friction pad 27 moves forward abuts against the surface of the fourth connecting portion 52 on the side opposite to the disc 11 in the disc axis direction. These return springs 196 apply force to the second friction pad 27 moving toward the disc 11 side in the disc axis direction in the direction away from the disc 11.

[0160] like Figure 1 As shown, the brake caliper 21 includes a brake caliper body 201 , a first slide pin 202 , a second slide pin 203 , a mounting bolt 204 , mounting bolts (not shown) and a piston (not shown).

[0161] The brake caliper 21 has a substantially mirror-symmetrical shape, and the radial reference line and the radial reference plane pass through the center position of the brake caliper 21 in the disc rotation direction. The first sliding pin 202 of the brake caliper 21 is fixed to the brake caliper body 201 by the mounting bolt 204. In addition, the second sliding pin 203 of the brake caliper 21 is fixed to the brake caliper body 201 by the mounting bolt not shown. The pair of the first sliding pin 202 and the second sliding pin 203 are arranged in parallel with each other so that their axial positions are aligned.

[0162] The mounting member 20 is provided with a first pin insertion hole (not shown) extending from the inner end surface of the first connection portion 33 in the disc axis direction to a midway position in the first connection portion 33. The mounting member 20 is provided with a second pin insertion hole (not shown) extending from the inner end surface of the second connection portion 34 in the disc axis direction to a midway position in the second connection portion 34. The first slide pin 202 of the brake caliper 21 is slidably engaged with the first pin insertion hole (not shown) of the mounting member 20. The second slide pin 203 of the brake caliper 21 is slidably engaged with the second pin insertion hole (not shown) of the mounting member 20.

[0163] Thus, the brake caliper 21 is supported on the mounting member 20 in such a manner that the brake caliper body 201 can slide in the disc axis direction via the first sliding pin 202 and the second sliding pin 203. In other words, the mounting member 20 supports the brake caliper 21 in such a manner that it can slide in the disc axis direction at the pair of first connecting portions 33 and the second connecting portions 34. Therefore, the brake caliper 21 is provided on the mounting member 20 in such a manner that it can move in the disc axis direction. The first pin cover 22 covers the portion of the first sliding pin 202 that protrudes from the mounting member 20. The second pin cover 23 covers the portion of the second sliding pin 203 that protrudes from the mounting member 20.

[0164] The caliper body 201 has a substantially mirror-symmetrical shape. The radial reference line and the radial reference plane pass through the center of the caliper body 201 in the disc rotation direction. The caliper body 201 includes 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 .

[0165] The cylinder portion 221 is arranged on the inner side of the disk axis direction relative to the disk 11. The bridge portion 222 extends outward along the disk axis direction in a manner that spans the outer circumference of the disk 11 from the outer side of the cylinder portion 221 in the disk radius direction. The claw portion 223 extends inward from the portion of the bridge portion 222 on the opposite side of the cylinder portion 221 in the disk radius direction and is arranged at a position further outward than the disk 11. The first pin arrangement portion 224 is arranged at a position further inward from the cylinder portion 221 in the disk rotation direction when moving forward. The second pin arrangement portion 225 is arranged at a position further inward from the cylinder portion 221 in the disk rotation direction when moving forward. The first sliding pin 202 of the caliper body 201 is fixed to the first pin arrangement portion 224 by a mounting bolt 204. The caliper body 201 fixes the second sliding pin 203 to the second pin arrangement portion 225 by mounting bolts not shown in the figure.

[0166] A cylinder hole (not shown) is formed in the cylinder portion 221. The cylinder hole (not shown) is recessed from the end surface of the cylinder portion 221 on the disk 11 side in the disk axis direction in the direction opposite to the disk 11. Therefore, the cylinder hole (not shown) is open on the disk 11 side. The cylinder hole (not shown) is along the disk axis direction. In the cylinder portion 221, the cylinder holes (not shown) are formed in parallel in a plurality of locations, specifically two locations, in the disk circumferential direction. Pistons (not shown) are respectively accommodated in these cylinder holes (not shown). Therefore, the brake caliper 21 is a double-piston type brake caliper. The claw portion 223 is arranged opposite to the cylinder portion 221 in the disk axis direction.

[0167] The piston (not shown) is accommodated in the cylinder hole (not shown) of the cylinder portion 221 so as to be movable along the disc axis direction. The piston (not shown) is opposed to the first braking surface 11a of the disc 11. A first friction pad 26 is arranged between the first braking surface 11a of the disc 11 and the piston (not shown). The piston (not shown) presses the first friction pad 26 when advancing toward the first braking surface 11a of the disc 11.

[0168] When the vehicle is braked while traveling forward, the disc brake 10 introduces brake fluid between the cylinder hole (not shown) of the cylinder portion 221 of the brake caliper 21 and the piston (not shown) via the brake pipe (not shown). Then, the brake fluid pressure in the cylinder portion 221 of the brake caliper 21 acts on the piston (not shown), and the piston (not shown) moves toward the disc 11. The piston (not shown) that moves forward in this way presses the inner first friction pad 26 disposed between the disc 11 and the disc 11 toward the disc 11. Then, the inner first friction pad 26 is guided by the mounting member 20 via the first pad spring 24 and the second pad spring 25 and moves in the disc axis direction, and contacts the first braking surface 11a on one side of the disc 11 in the lining 173 and is pressed against the disc 11.

[0169] At this time, the first friction pad 26 on the inner side is also pressed toward the outward side of the disk rotation direction when the disk is forward due to the friction force with the rotating disk 11. Figure 4 The torque receiving portion 60 of the second connecting portion 47 on the inner side and outward side of the disc rotation direction during forward movement receives the braking torque from the protrusion 176 on the outward side of the disc rotation direction during forward movement of the first friction pad 26 via the wall plate portion 113A of the guide recess 120A on the inner side of the second pad spring 25 .

[0170] The reaction force of the piston (not shown) pressing the first friction pad 26 toward the disc 11 is Figure 1 The caliper body 201 of the brake caliper 21 shown in the figure moves along the disc axis direction by sliding the first sliding pin 202 and the second sliding pin 203 relative to the mounting member 20. Then, the claw portion 223 of the caliper body 201 presses the outer second friction pad 27 disposed between the claw portion 223 and the disc 11 toward the disc 11. Then, the outer second friction pad 27 is guided by the mounting member 20 via the first pad spring 24 and the second pad spring 25 and moves in the disc axis direction, and contacts the other second braking surface 11b of the disc 11 in the lining 173 and is pressed against the disc 11.

[0171] At this time, the outer second friction pad 27 is also pressed toward the outward side of the disk rotation direction when the disk is forward due to the friction force with the rotating disk 11. Figure 5 The torque receiving portion 60 of the fourth connection portion 52 shown as being on the outer side and on the outward side of the disc rotation direction during forward movement receives the braking torque from the protrusion 176 on the outward side of the disc rotation direction during forward movement of the second friction pad 27 via the wall plate portion 113A of the outer guide recess 120A of the second pad spring 25 .

[0172] The mounting member 20 is supported in a slidable manner. Figure 1The brake caliper 21 shown in the figure clamps a pair of first friction pads 26 and second friction pads 27 from both sides of the disc axis direction by the piston and claws 223 not shown in the figure through the operation of the piston not shown in the figure. 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. As a result, the disc brake 10 applies friction resistance to the disc 11 to generate braking force. The brake caliper 21 is a so-called fist-type (sliding-type) brake caliper.

[0173] When braking while the vehicle is traveling backward, the disc brake 10 presses the first friction pad 26 against the first braking surface 11a of the disc 11 and the second friction pad 27 against the second braking surface 11b of the disc 11 in the same manner as described above. At this time, the first friction pad 26 and the second friction pad 27 are pressed toward the outward side of the disc rotation direction opposite to the above by the disc 11 rotating in the opposite direction to the above.

[0174] Then, the first friction pad 26 presses the end surface 184 of the spring plate portion 131 on the inner side of the first pad spring 24 on the side of the main body 175 on the side of the disc rotation direction when retreating to the side of the disc rotation direction when retreating, and elastically deforms it. Then, the first friction pad 26 abuts against the vertex of the bend of the wall plate portion 113 on the inner side of the first pad spring 24 at the center of the protrusion 176 on the side of the disc rotation direction when retreating in the direction of the reference line of the disc radius. Then, the protrusion 176 presses the wall plate portion 113 on the side of the disc rotation direction when retreating at the front end surface 193 thereof, and elastically deforms it. Then, the wall plate portion 113 finally becomes a flat plate, and is in a state of surface contact with the front end surface 193 of the protrusion 176 on the side of the disc rotation direction when retreating of the first friction pad 26 and the third surface 63 of the torque receiving surface of the torque receiving portion 60 of the first connecting portion 46.

[0175] For the disc brake 10, this state becomes the second state in which the gap between the front end surface 193 of the protrusion 176 on the disc rotation direction outward side of the first friction pad 26 during retreat and the wall plate portion 113 on the inner side of the first pad spring 24 is filled by the movement of the first friction pad 26. When the second state is reached, the torque receiving portion 60 of the first connecting portion 46 on the disc rotation direction outward side and on the inner side of the mounting member 20 during retreat receives the braking torque from the protrusion 176 on the disc rotation direction outward side of the first friction pad 26 during retreat via the wall plate portion 113 on the inner side of the first pad spring 24 at the third surface 63.

[0176] In addition, the second friction pad 27 pressed by the outward side of the disc rotation direction when the disc 11 moves backward will Figure 6The spring plate portion 131 of the outer side of the first pad spring 24 shown in the figure presses the end surface 184 of the main body 185 on the side of the disc rotation direction when retreating to the side of the disc rotation direction when retreating, so as to cause elastic deformation. Then, the second friction pad 27 abuts against the vertex of the bend of the wall plate portion 113 of the outer side of the first pad spring 24 at the center of the protrusion 176 on the side of the disc rotation direction when retreating in the direction of the reference line of the disc radius. Then, the protrusion 176 presses the wall plate portion 113 on the side of the disc rotation direction when retreating at its front end surface 193, so as to cause elastic deformation. Then, the wall plate portion 113 finally becomes a flat plate, and is in a state of surface contact with the front end surface 193 of the protrusion 176 on the side of the disc rotation direction when retreating of the second friction pad 27 and the third surface 63, which is the torque bearing surface of the torque bearing portion 60 of the third connecting portion 51.

[0177] For the disc brake 10, this state becomes the second state in which the gap between the front end surface 193 of the protrusion 176 on the disc rotation direction outward side of the second friction pad 27 during retreat and the outer wall plate portion 113 of the first pad spring 24 is filled by the movement of the second friction pad 27. When the second state is reached, the torque receiving portion 60 of the third connecting portion 51 on the disc rotation direction outward side and the outer side of the mounting member 20 during retreat receives the braking torque from the protrusion 176 on the disc rotation direction outward side of the second friction pad 27 during retreat via the outer wall plate portion 113 of the first pad spring 24 at the third surface 63.

[0178] The above-mentioned Patent Document 1 discloses a disc brake which is mounted on a mounting member and has a pad spring which elastically supports a friction pad. However, in the disc brake, it is desirable to suppress the generation of abnormal noise. For example, in the disc brake, when a vehicle changes from a forward braking state to a reverse braking state, there is a friction pad moving in the mounting member and generating a hitting sound, so-called a knocking sound, between the friction pad and the mounting member. In the disc brake, it is desirable to suppress the generation of such abnormal noise.

[0179] The first pad spring 24 on the side of the disc rotation direction when the disc brake 10 of the embodiment is forward-moving includes an outer spring plate portion 131 and a guide recess 120. 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 in the disc radial direction relative to the outer spring plate portion 131, covers the outer torque receiving portion 60, and elastically supports the second friction pad 27 in the disc rotation direction. In addition, the disc brake 10 has a first state and a second state on the outer side. In the first state on the outer side, one of the outer spring plate portion 131 and the guide recess 120 of the first pad spring 24, that is, the spring plate portion 131, abuts against the second friction pad 27, and the other, that is, the guide recess 120, has a gap S between the wall plate portion 113 and the second friction pad 27. In the second state on the outer side, the gap S is filled by the movement of the second friction pad 27. Therefore, when the vehicle changes from the forward braking state to the reverse braking state, the second friction pad 27 moves from the first state to the outward side in the disc rotation direction when the vehicle moves backward, and elastically deforms the outer spring plate portion 131 of the first pad spring 24. Then, the second friction pad 27 elastically deforms the outer spring plate portion 131 of the first pad spring 24 together with the wall plate portion 113 of the guide recess 120, and changes to the second state of filling the gap S between the wall plate portion 113 and the second friction pad 27. Therefore, the first pad spring 24 elastically deforms in stages, and absorbs the collision energy of the second friction pad 27 against the mounting member 20. As a result, when the vehicle changes from the forward braking state to the reverse braking state, the disc brake 10 can suppress the generation of abnormal noise such as the hitting sound or the so-called knocking sound generated between the second friction pad 27 and the mounting member 20 when the second friction pad 27 moves inside the mounting member 20.

[0180] In addition, the first pad spring 24 has an inner spring plate portion 131 and a guide recess 120. The inner spring plate portion 131 of the first pad spring 24 elastically supports the first friction pad 26 in the disk rotation direction. The inner guide recess 120 of the first pad spring 24 is offset in the disk radial direction relative to the inner spring plate portion 131, covers the inner torque receiving portion 60, and elastically supports the first friction pad 26 in the disk rotation direction. Moreover, the disc brake 10 has a first state and a second state on the outer side. In the inner first state, one of the inner spring plate portion 131 and the guide recess 120 of the first pad spring 24, that is, the spring plate portion 131, abuts against the first friction pad 26, and the other, that is, the guide recess 120, has a gap between the wall plate portion 113 and the first friction pad 26. In the inner second state, the gap is filled by the movement of the first friction pad 26. Therefore, when the vehicle changes from the forward braking state to the reverse braking state, the first friction pad 26 moves from the first state to the reverse disc rotation direction outward side on the inner side of the disc brake 10, and elastically deforms the inner spring plate portion 131 of the first pad spring 24. Then, the first friction pad 26 elastically deforms the inner spring plate portion 131 of the first pad spring 24 together with the wall plate portion 113 of the guide recess 120, and changes to the second state that fills the gap between the wall plate portion 113 and the first friction pad 26. Therefore, the first pad spring 24 elastically deforms in stages, and absorbs the collision energy of the first friction pad 26 against the mounting member 20. As a result, when the vehicle changes from the forward braking state to the reverse braking state, the disc brake 10 can suppress the generation of abnormal noise such as the hitting sound or the so-called knocking sound generated between the first friction pad 26 and the mounting member 20 when the first friction pad 26 moves inside the mounting member 20.

[0181] The disc brake 10 is in the first state in the non-braking state, whereby the second friction pad 27 can be pressed toward the outward side of the disc rotation direction when the vehicle is moving forward by the spring plate portion 131 on the outer side of the first pad spring 24. Therefore, the disc brake 10 can suppress the generation of abnormal noise between the mounting member 20 and the second friction pad 27 when the second friction pad 27 moves toward the outward side of the disc rotation direction when the vehicle is moving forward in the non-braking state.

[0182] In addition, the disc brake 10 is in the first state in the non-braking state, whereby the first friction pad 26 can be pressed toward the outward side in the disc rotation direction when the vehicle is moving forward by the spring plate portion 131 inside the first pad spring 24. Therefore, the disc brake 10 can suppress the generation of abnormal noise between the mounting member 20 and the first friction pad 26 when the first friction pad 26 moves toward the outward side in the disc rotation direction when the vehicle is moving forward when braking from the non-braking state while the vehicle is moving forward.

[0183] The disc brake 10 is in the first state when the brake is released, and the second friction pad 27 is pressed toward the outward side of the disc rotation direction during forward movement only by the spring plate portion 131 of the outer side of the first pad spring 24 and the wall plate portion 113 of the guide recess 120. Therefore, the disc brake 10 can reduce the friction force between the second friction pad 27 and the outer side of the second pad spring 25 and the guide recess 120 when the brake is released, and can suppress the drag of the second friction pad 27 on the disc 11 when the brake is released.

[0184] In addition, the disc brake 10 is in the first state when the brake is released, and the first friction pad 26 is pressed toward the outward side of the disc rotation direction when the forward movement occurs only by the spring plate portion 131 of the inner side of the first pad spring 24 and the wall plate portion 113 of the guide recess 120. Therefore, the disc brake 10 can reduce the friction force between the first friction pad 26 and the inner side of the second pad spring 25 when the brake is released, and can suppress the drag of the first friction pad 26 on the disc 11 when the brake is released.

[0185] It should be noted that the disc brake 10 may have a first state and a second state, wherein the first state is a state in which one of the spring plate portion 131 on the outside of the first pad spring 24 and the wall plate portion 113 of the guide recess 120 abuts against the second friction pad 27, and the other of the spring plate portion 131 and the second friction pad 27 has a gap, and the second state is a state in which the gap is filled by the movement of the second friction pad 27. In addition, the disc brake 10 may have a first state and a second state, wherein the first state is a state in which one of the spring plate portion 131 on the inside of the first pad spring 24 and the wall plate portion 113 of the guide recess 120 abuts against the first friction pad 26, and the other of the spring plate portion 131 and the first friction pad 26 has a gap, and the second state is a state in which the gap is filled by the movement of the first friction pad 26. In any of these cases, the same effects as described above are achieved.

[0186] In the disc brake 10, the outer spring plate portion 131 of the first pad spring 24 is arranged at a position further outward in the disc radial direction than the outer guide recess 120. In the first state, the outer spring plate portion 131 abuts against the second friction pad 27, and the outer guide recess 120 has a gap S between the wall plate portion 113 and the second friction pad 27. Therefore, the disc brake 10 is in the first state in the non-braking state, and the second friction pad 27 can be pressed toward the outward side in the disc rotation direction when the vehicle is moving forward by the outer spring plate portion 131 arranged further outward in the disc radial direction than the outer guide recess 120 in the first pad spring 24. Therefore, the disc brake 10 can effectively suppress the loosening of the second friction pad 27 in the non-braking state when the vehicle is moving forward.

[0187] In addition, in the disc brake 10, the inner spring plate portion 131 of the first pad spring 24 is arranged at a position closer to the outer side in the disc radial direction than the inner guide recess 120. In the first state, the inner spring plate portion 131 abuts against 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, the disc brake 10 is in the first state in the non-braking state, and the first friction pad 26 can be pressed toward the outward side in the disc rotation direction when the vehicle is moving forward by the inner spring plate portion 131 arranged closer to the outer side in the disc radial direction than the inner guide recess 120 in the first pad spring 24. Therefore, the disc brake 10 can effectively suppress the loosening of the first friction pad 26 in the non-braking state when the vehicle is moving forward.

[0188] In the disc brake 10, in the first pad spring 24, 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 outward rotation side in the disc rotation direction during forward movement by the outer spring plate portion 131 of the first pad spring 24 having a lower spring constant than the wall plate portion 113 of the outer guide recess 120. Therefore, the disc brake 10 can further suppress the drag of the second friction pad 27 on the disc 11 when the brake is released.

[0189] In addition, in the disc brake 10, the spring constant of the inner spring plate portion 131 of the first pad spring 24 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 outward rotation side in the disc rotation direction during forward movement by the outer spring plate portion 131 of the first pad spring 24 having a lower spring constant than the wall plate portion 113 of the inner guide recess 120. Therefore, the disc brake 10 can further suppress the drag of the first friction pad 26 on the disc 11 when the brake is released.

[0190] In the disc brake 10, the guide recess 120 on the outside of the first pad spring 24 has a wall plate portion 113 that is bent from the third surface portion 63, which is the torque receiving surface of the torque receiving portion 60 on the outside and the side where the disc rotates in the forward direction, toward the second friction pad 27. Therefore, the disc brake 10 can achieve the above-mentioned effect with a simple structure in which the shape of the wall plate portion 113 of the guide recess 120 on the outside of the first pad spring 24 is bent.

[0191] In addition, in the disc brake 10, the guide recess 120 on the inner side of the first pad spring 24 has the wall plate portion 113 bent from the third surface portion 63, which is the torque receiving surface of the torque receiving portion 60 on the inner side and the side where the disc rotates in the forward direction, toward the first friction pad 26. Therefore, the disc brake 10 can achieve the above-mentioned effect with a simple structure in which the shape of the wall plate portion 113 of the guide recess 120 on the inner side of the first pad spring 24 is bent.

[0192] In the disc brake 10, the first pad spring 24 on the side where the disc rotates in the forward direction is provided with a spring plate portion 121 that contacts the second friction pad 27 and supports the outer side of the second friction pad 27 on the outer side in the disc radial direction. Furthermore, when the vehicle is reversed, the bend vertex of the wall plate portion 113 of the outer guide recess 120 of the first pad spring 24 contacts the center of the protrusion 176 arranged in the torque receiving portion 60 on the side where the disc rotates in the forward direction of the second friction pad 27. Therefore, the disc brake 10 can effectively generate a force acting on the second friction pad 27 through the wall plate portion 113 of the outer guide recess 120 of the first pad spring 24.

[0193] In addition, the first pad spring 24 on the disc rotation direction turning side of the disc brake 10 during forward movement includes a spring plate portion 121 that contacts the first friction pad 26 and supports the inner side of the first friction pad 26 on the outer side in the disc radial direction. Furthermore, when the vehicle is braked in reverse, the first pad spring 24 has the apex of the curve of the wall plate portion 113 of the inner guide recess 120 contact the center of the protrusion 176 arranged in the torque receiving portion 60 on the disc rotation direction turning side of the first friction pad 26 during forward movement. Therefore, the disc brake 10 can effectively generate a force acting on the first friction pad 26 through the wall plate portion 113 of the inner guide recess 120.

[0194] Description of Reference Numerals

[0195] 10 Disc brakes;

[0196] 11 plates;

[0197] 20 Install components;

[0198] 21 Brake calipers;

[0199] 24 first pad spring (pad spring);

[0200] 26 first friction lining (friction lining);

[0201] 27 second friction lining (friction lining);

[0202] 60 torque bearing part;

[0203] 113 wall plate portion (elastic plate portion);

[0204] 120 guiding recess (second supporting portion);

[0205] 121 spring plate portion (third supporting portion);

[0206] 131 spring plate portion (first supporting portion);

[0207] 176 salient;

[0208] S Gap.

Claims

1. A disc brake comprising: a mounting member mounted on a non-rotating portion of the vehicle and having a torque receiving portion in the direction of disk rotation; A friction pad, which is movable along the disc axis; a brake caliper supported by the mounting member and pressing the friction pad against the disc; a pad spring mounted on the mounting member to elastically support the friction pad; It is characterized in that The pad spring on the disc rotation direction inward side has: a first support portion elastically supporting the friction pad in a disc rotation direction; a second support portion, which is offset in the disc radial direction relative to the first support portion, covers the torque receiving portion, and elastically supports the friction pad in the disc rotation direction; There is a first state in which one of the first support portion and the second support portion is in contact with the friction pad and the other has a gap with the friction pad, and A second state in which the gap is filled by the movement of the friction pad.

2. The disc brake according to claim 1, wherein: The first support portion is arranged outside the second support portion in the disk radial direction. The first state is a state in which the friction pad is supported by the first support portion and has a gap between the friction pad and the second support portion.

3. The disc brake according to claim 2, wherein: The first support portion has a spring constant smaller than a spring constant of the second support portion.

4. The disc brake according to any one of claims 1 to 3, wherein: The second support portion includes an elastic plate portion bent from the torque receiving surface of the torque receiving portion toward the friction pad.

5. The disc brake according to claim 4, wherein: The pad spring includes a third support portion that abuts against the friction pad and supports the friction pad on the outer side in the radial direction of the disc. During reverse braking of the vehicle, the curved apex of the elastic plate portion abuts against the center of the protrusion arranged in the torque receiving portion of the friction pad.

6. A disc brake comprising: a mounting member mounted on a non-rotating portion of the vehicle and having a torque receiving portion in the direction of disk rotation; A friction pad, which is movable along the disc axis; a brake caliper supported by the mounting member and pressing the friction pad against the disc; a pad spring mounted on the mounting member to elastically support the friction pad; It is characterized in that The pad spring on the disc rotation direction inward side has: a first support portion elastically supporting the friction pad in a disc rotation direction; a second support portion, which is offset in the disc radial direction relative to the first support portion, covers the torque receiving portion, and elastically supports the friction pad in the disc rotation direction; The first support portion has a spring constant smaller than a spring constant of the second support portion.

Images