Disc brake device

Abstract

The present invention realizes a disc brake device capable of independently setting, for each pair of pads, a force applied to the pair of pads in a direction away from a rotor. The pad jig (5) has engagement receiving sections (31a, 31b) in the middle in the circumferential direction. The pair of return springs (6a, 6b) are made of wires, are arranged so that the respective longitudinal directions thereof face the circumferential direction and are separated in the axial direction, have a pair of pressing parts for pressing the pads (4a, 4b) at both outer end parts in the circumferential direction, and have engagement parts (44a, 44b, 51a, 51b) at the intermediate parts in the circumferential direction. The engagement section presses the engagement receiving sections (31a, 31b) in the axial direction in the direction opposite to the pressing direction of the pair of pressing sections.

Description

Technical Field

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

[0002] In a disc brake device, brake fluid introduced into a cylinder of a caliper pushes a piston out of the cylinder, and the piston presses a pair of pads against both axial side surfaces of a rotor, thereby obtaining a braking force.

[0003] When the braking force by the disc brake device is released, the brake fluid in the cylinder is discharged. As a result, the piston retreats into the cylinder due to the elastic recovery of the piston seal that seals between the piston and the cylinder. In addition, since the rotor rotates with slight vibration, the pair of pads retreat from the rotor by contacting the axial side surfaces of the rotor that rotates with slight vibration.

[0004] In recent years, in order to improve the fuel efficiency and power consumption of vehicles, when the braking force by the disc brake device is released, it is required to quickly withdraw the pair of pads from the rotor to suppress the friction between the pair of pads and the axial side surfaces of the rotor.

[0005] Japanese Patent Application Laid-Open No. 2009-222202 discloses a technique for rapidly retracting a pair of pads from a rotor using a pair of return springs made of wire.

[0006] The return spring has a substantially V-shape when viewed radially, and is sandwiched between the pair of pads in a state of crossing the rotor from the radial outside. Thus, the return spring applies an elastic force in a direction away from the rotor to the pair of pads. Therefore, when the braking force of the disc brake is released, the pair of pads can be quickly retracted from the rotor.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Patent Application Publication No. 2009-222202 Summary of the invention

[0010] Technical problem that the invention aims to solve

[0011] In the conventional structure described in Japanese Patent Application Laid-Open No. 2009-222202, the return spring is sandwiched between the pair of pads in a state of crossing the rotor from the radially outer side, so that forces of the same magnitude and opposite directions in the axial direction are applied from the return spring to the pair of pads. Therefore, it is impossible to independently set the forces applied to the pair of pads in the direction away from the rotor.

[0012] An object of the present invention is to provide a disc brake device capable of independently setting the forces applied to a pair of pads in a direction away from a rotor.

[0013] Technical solutions to the problem

[0014] A disc brake device according to one aspect of the present invention includes a caliper body, a pair of pad pins, a pair of pads, a pad clamp, and a pair of return springs.

[0015] The brake caliper body has an inner body and an outer body.

[0016] The pair of pad pins are arranged in parallel with each other and spaced apart in the circumferential direction at a position radially outward of the rotor, and are spanned in the axial direction between the inner body and the outer body.

[0017] The pair of pads are arranged at both sides of the rotor in the axial direction and are suspended and supported by the pair of pad pins.

[0018] The pad clamp is disposed radially outwardly of the pair of pads, and presses both circumferential outer portions of the radially outer portions of each of the pair of pads at least radially inwardly.

[0019] The pair of return springs press the pair of pads in a direction away from the rotor in the axial direction.

[0020] In the disc brake device according to one aspect of the present invention, the pad clamp has an engagement receiving portion in a circumferentially intermediate portion.

[0021] The pair of return springs are made of wire and are arranged in a manner that their respective length directions are circumferentially oriented and separated in the axial direction. They respectively have a pair of pressing parts at the two outer ends in the circumferential direction for pressing the pad, and respectively have a clamping part in the middle part in the circumferential direction. The clamping part presses the clamping receiving part in the axial direction in the direction opposite to the pressing direction of the pair of pressing parts.

[0022] In the disc brake device according to one aspect of the present invention, the engagement portion presses the engagement receiving portion radially outward.

[0023] In the disc brake device according to one aspect of the present invention, the pad clamp is made of a metal plate, and the engagement receiving portion is composed of a cut-and-raised piece formed on the pad clamp.

[0024] In the disc brake device according to one aspect of the present invention, the pad clamp includes: the two engagement receiving portions arranged to be spaced apart in the axial direction; and a hole portion arranged between the two engagement receiving portions in the axial direction and penetrating in the radial direction.

[0025] In the disc brake device according to one aspect of the present invention, the pad clamp presses the pair of pad pins toward the radially outer side.

[0026] In the disc brake device according to one aspect of the present invention, the pair of return springs have curved seat portions at circumferentially intermediate portions thereof, the curved seat portions being curved along the flat radially outer side surface of the pad holder.

[0027] In the disc brake device according to one aspect of the present invention, the curved seat portion presses the radially outer surface of the pad clamp toward the radial inside.

[0028] In a disc brake device according to one technical solution of the present invention, a pair of return springs realizes circumferential positioning relative to the pad clamp.

[0029] In this case, the pair of return springs has a spring side positioning portion, and the pad clamp has a clamp side positioning portion that engages with the spring side positioning portion in the circumferential direction. Moreover, the pair of return springs are positioned circumferentially relative to the pad clamp based on the engagement of the spring side positioning portion with the clamp side positioning portion.

[0030] In this case, the spring-side positioning portion is further formed by a pair of bent portions that are respectively extended in a manner that the more they are separated from each other in the circumferential direction, the more they are radially outward. The fixture-side positioning portion is formed by a pair of inclined plate portions that are arranged at positions on both outsides of the pair of bent portions in the circumferential direction and are respectively inclined in a manner that the more they are separated from each other in the circumferential direction, the more they are radially outward.

[0031] In the disc brake device according to one aspect of the present invention, the pad has a guide hole through which the pad pin is inserted.

[0032] While the liner is worn from a new state to a service limit, the contact position between the liner and the pressing portion is located near the guide hole and radially outward of the outer peripheral edge of the rotor.

[0033] In the disc brake device according to one aspect of the present invention, the pair of return springs have symmetrical shapes in the circumferential direction with the circumferential center portion as the center.

[0034] In the disc brake device according to one aspect of the present invention, one of the pair of return springs and the other of the pair of return springs have symmetrical shapes in the axial direction.

[0035] In the disc brake device according to one aspect of the present invention, one of the pair of return springs and the other of the pair of return springs have asymmetric shapes in the axial direction.

[0036] In the disc brake device according to one aspect of the present invention, one of the pair of return springs and the other of the pair of return springs have different magnitudes of force pressing the pair of pads in the axial direction.

[0037] In the disc brake device according to one aspect of the present invention, a surface of the pad that contacts the pressing portion is a smooth surface.

[0038] Effects of the Invention

[0039] According to the disc brake device according to one aspect of the present invention, the force applied to the pair of pads in the direction away from the rotor can be independently set for each pair of pads. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a front view of the disc brake device according to the first example of the embodiment of the present invention as viewed from the axial outside.

[0041] Figure 2 This is a rear view of the disc brake device of the first example as viewed from the axial inside.

[0042] Figure 3 This is a side view of the disc brake device of the first example as viewed from the entry side.

[0043] Figure 4 This is a plan view of the disc brake device of the first example as viewed from the radially outer side.

[0044] Figure 5 This is a bottom view of the disc brake device of the first example as viewed from the radial inner side.

[0045] Figure 6 is along Figure 4 Cross-section diagram along line AA.

[0046] Figure 7 yes Figure 6 A partial enlarged view of .

[0047] Figure 8 This is a perspective view of the disc brake device of the first example as viewed from the radially outer side and the axially outer side.

[0048] Fig. 9 This is a diagram of the disc brake device of the first example, viewed from the axial outside with the caliper body omitted.

[0049] Fig.10 This is a diagram of the disc brake device of the first example, viewed from the axial inner side, with the caliper body omitted.

[0050] Fig.11 This is a diagram of the disc brake device of the first example viewed from the forward side with the caliper body omitted.

[0051] Fig.12 This is a diagram of the disc brake device of the first example viewed from the swing-out side with the caliper body omitted.

[0052] Fig.13 This is a diagram of the disc brake device of the first example as viewed from the radially outer side with the caliper body omitted.

[0053] Fig.14 This is a diagram of the disc brake device of the first example as viewed from the radial inner side with the caliper body omitted.

[0054] Fig.15 It is along Fig.13 Cross-sectional view of line BB.

[0055] Fig.16 is from Fig.15 The view viewed in the direction of arrow C.

[0056] Fig.17 Concerning the first example, this is a partial enlarged view showing the shoulder portion of the pad.

[0057] Fig.18 This is a perspective view of the disc brake device of the first example, with the caliper body omitted, viewed from the radially outer side and the axially outer side.

[0058] Fig.19 Concerning the first example, this is a diagram showing a pad clamp and a pair of return springs in an installed state as viewed from the axial outside.

[0059] Fig. 20 Concerning the first example, this is a diagram showing a pad clamp and a pair of return springs in an installed state as viewed from the rotation side.

[0060] Fig.21 Concerning the first example, this is a diagram showing a pad clamp and a pair of return springs in an installed state as viewed from the rotation-out side.

[0061] Fig. 22 Concerning the first example, this is a diagram showing a pad clamp and a pair of return springs in an installed state as viewed from the radially outer side.

[0062] Fig.23 Concerning the first example, this is a diagram showing a pad clamp and a pair of return springs in an installed state as viewed from the radial inner side.

[0063] Fig.24 The first example is a perspective view of a pad clamp and a pair of return springs in an installed state as viewed from the radially outer side and the axially outer side.

[0064] Fig.25 The first example is a perspective view of the pad clamp in the installed state as viewed from the radially outer side and the axially outer side.

[0065] Fig.26Concerning the first example, this is a diagram showing a pair of return springs in an installed state as viewed from the radially outer side.

[0066] Fig. 27 The first example is a diagram showing a pair of return springs in an installed state as viewed from the radial inner side.

[0067] Fig.28 Concerning the first example, this is a diagram showing a pair of return springs in an installed state as viewed from the rotation-in side.

[0068] Fig.29 Concerning the first example, this is a diagram showing a pair of return springs in an installed state as viewed from the swing-out side.

[0069] Fig.30 (A) is a diagram showing a state where a pair of return springs are mounted on a pad clamp. Fig.30 (B) is a diagram showing a state where the belt is attached to a pair of return springs.

[0070] Fig.31 The second example of the embodiment of the present invention is Fig.13 Quite a picture.

[0071] Explanation of symbols

[0072] 1 disc brake

[0073] 2 Brake caliper body

[0074] 3a, 3b pad pin

[0075] 4a Lining block

[0076] 4b outer lining block

[0077] 5. Pad clamp

[0078] 6a, 6b, 6c, 6d return spring

[0079] 7 Rotors

[0080] 8 Endosome

[0081] 9 outer body

[0082] 10a, 10b connection part

[0083] 11 Middle connecting part

[0084] 12a, 12b inner cylinder

[0085] 13a, 13b inner support holes

[0086] 14 Mounting Seat

[0087] 15a, 15b outer cylinder

[0088] 16a, 16b outer support holes

[0089] 17a, 17b extend out of the wall

[0090] 18a, 18b torque bearing surface

[0091] 19 Connecting bolts

[0092] 20a, 20b Head

[0093] 21a, 21b anti-drop pin

[0094] 22 Liner

[0095] 23 Back Plate

[0096] 24a, 24b torque transmission surface

[0097] 25a, 25b Shoulder

[0098] 26a, 26b guide holes

[0099] 27Substrate Department

[0100] 28a, 28b Inner arm

[0101] 29a, 29b Outer arm

[0102] 30a, 30b support arm

[0103] 31a, 31b engagement receiving portion

[0104] 32a, 32b rising part

[0105] 33a, 33b return part

[0106] 34 hole part

[0107] 35a, 35b connecting plate portion

[0108] 36 Fixture side positioning part

[0109] 37a, 37b inclined plate parts

[0110] 38a, 38b Pad pressing portion

[0111] 39a, 39b Pad pressing portion

[0112] 40a, 40b Pin pressing portion

[0113] 41a, 41b Spring arm

[0114] 42 Installation

[0115] 43a, 43b Pressing part

[0116] 44a, 44b engagement portion

[0117] 45 curved seat

[0118] 46 Spring side positioning part

[0119] 47a, 47b bending portion

[0120] 48a, 48b Spring arm

[0121] 49 Installation Department

[0122] 50a, 50b pressing portion

[0123] 51a, 51b engagement portion

[0124] 52 curved seat

[0125] 53 Spring side positioning part

[0126] 54a, 54b bending portion

[0127] 55a, 55b belt

[0128] 56 assembly

[0129] 57a, 57b inner piston

[0130] 58a, 58b outer piston DETAILED DESCRIPTION

[0131] [First example]

[0132] use Figures 1 to 30 A first example of an embodiment of the present invention will be described.

[0133] A disc brake device 1 according to one embodiment of the present invention is an opposed piston disc brake device used for braking a vehicle.

[0134] The disc brake device 1 includes a caliper body 2 , a pair of pad pins 3 a and 3 b , a pair of pads, namely an inner pad 4 a and an outer pad 4 b , a pad clamp 5 , and a pair of return springs 6 a and 6 b .

[0135] In the present specification and claims, unless otherwise specified, the terms “axial direction”, “circumferential direction”, and “radial direction” refer to the disc-shaped rotor 7 (see FIG. 1 ) that rotates together with the wheel. Figure 4) in the axial, circumferential and radial directions. The axial outer side refers to the outer side in the width direction of the vehicle when the disc brake device 1 is installed on the vehicle, and the axial inner side refers to the center side in the width direction of the vehicle when the disc brake device 1 is installed on the vehicle. The circumferential outer side refers to both circumferential sides of the disc brake device 1, and the circumferential inner side refers to the circumferential center side of the disc brake device 1. Among the circumferential outer sides, the side where the rotor 7 enters the brake caliper body 2 when the vehicle moves forward is called the rotation-in side, and the side where the rotor 7 escapes from the brake caliper body 2 when the vehicle moves forward is called the rotation-out side.

[0136] [Brake caliper body]

[0137] The brake caliper body 2 has a substantially arcuate shape when viewed in the axial direction, and supports a pair of pads 4a and 4b so as to be movable in the axial direction. The brake caliper body 2 is configured to cover a portion of the circumferential direction of the rotor 7 from the radial outside, and is supported and fixed to the steering knuckle constituting the suspension device. The brake caliper body 2 is made of a light alloy such as an aluminum alloy or an iron alloy.

[0138] The brake caliper body 2 has an inner body 8 and an outer body 9 .

[0139] The caliper body 2 includes two connecting portions 10 a and 10 b and one intermediate connecting portion 11 in addition to the inner body 8 and the outer body 9 .

[0140] The inner body 8 is arranged on the axial inner side of the radial outer side of the rotor 7. The inner body 8 has a plurality of (two in the illustrated example) inner cylinder bodies 12a, 12b that are open to the axial outer side. The plurality of inner cylinder bodies 12a, 12b are connected to each other through an oil passage (not illustrated) provided inside the inner cylinder body 8. The inner pistons 57a, 57b are embedded in the inner cylinder bodies 12a, 12b in a manner that allows them to move in the axial direction. The inner cylinder bodies 12a, 12b and the inner pistons 57a, 57b are sealed by piston seals (not illustrated).

[0141] The inner body 8 has a pair of inner support holes 13a and 13b on the radially outer side (see Figure 4 The pair of inner support holes 13a and 13b are arranged to be separated in the circumferential direction and arranged on the radially outer sides of the inner cylinder bodies 12a and 12b. The inner support holes 13a and 13b are through holes, and the central axes thereof are oriented in the axial direction.

[0142] The inner body 8 has a mounting seat 14 at the radially inner side. The caliper body 2 is fixed to the suspension device by the mounting seat 14.

[0143] The outer body 9 is arranged on the axially outer side of the radially outer portion of the rotor 7. The outer body 9 has a plurality of (two in the illustrated example) outer cylinder bodies 15a, 15b that are open to the axial inner side. The plurality of outer cylinder bodies 15a, 15b are connected to each other through an oil passage (not illustrated) provided inside the outer body 9. The outer pistons 58a, 58b are embedded in the outer cylinder bodies 15a, 15b in a manner that allows them to move in the axial direction. The outer cylinder bodies 15a, 15b and the outer pistons 58a, 58b are sealed by piston seals (not illustrated).

[0144] The outer body 9 has a pair of outer support holes 16a and 16b on the radially outer side (see Figure 4 The pair of outer support holes 16a and 16b are arranged apart from each other in the circumferential direction and arranged radially outside the outer cylinder bodies 15a and 15b. The outer support holes 16a and 16b are through holes, and the central axes thereof are oriented in the axial direction.

[0145] A pair of projecting wall portions 17a, 17b are provided on both circumferentially outer sides of the axially outer side surface of the inner body 8 and both circumferentially outer sides of the axially inner side surface of the outer body 9 so as to project in the axial direction close to the rotor 7 (see Figure 6 The projecting wall portions 17a and 17b have flat torque receiving surfaces 18a and 18b on the inner side surfaces in the circumferential direction.

[0146] The inner body 8 and the outer body 9 are formed independently of each other and are connected in the axial direction by a plurality of connecting bolts 19. However, the caliper body may also be formed as a single-piece molded structure in which the entirety is formed integrally.

[0147] The connecting portions 10a, 10b and the intermediate connecting portion 11 are arranged on the radially outer side of the rotor 7, and connect the inner body 8 and the outer body 9 in the axial direction. One connecting portion 10a is arranged on the rotation-in side of the brake caliper body 2, and connects the end of the rotation-in side of the inner body 8 and the end of the rotation-in side of the outer body 9 in the axial direction. The other connecting portion 10b is arranged on the rotation-out side of the brake caliper body 2, and connects the end of the rotation-out side of the inner body 8 and the end of the rotation-out side of the outer body 9 in the axial direction. The intermediate connecting portion 11 is arranged between the two connecting portions 10a, 10b in the circumferential direction, and connects the circumferential middle portion of the inner body 8 and the circumferential middle portion of the outer body 9 in the axial direction.

[0148] [Block pin]

[0149] The pair of pad pins 3a and 3b are arranged spaced apart in the circumferential direction at radially outer sides of the rotor 7. The pair of pad pins 3a and 3b are arranged parallel to each other with their central axes facing the axial direction.

[0150] The pair of pad pins 3 a and 3 b are spanned between the inner body 8 and the outer body 9 in the axial direction.

[0151] One pad pin 3a is inserted through the inner support hole 13a and the outer support hole 16a, and is circumferentially arranged between one connecting portion 10a and the middle connecting portion 11. Another pad pin 3b is inserted through the inner support hole 13b and the outer support hole 16b, and is circumferentially arranged between another connecting portion 10b and the middle connecting portion 11.

[0152] The pad pins 3a and 3b are made of metal and have a substantially cylindrical shape.

[0153] The pad pins 3a and 3b have heads 20a and 20b at the ends on the axially outer sides. The heads 20a and 20b have outer diameters larger than the inner diameters of the outer support holes 16a and 16b. The portions of the pad pins 3a and 3b that protrude axially inward from the inner support holes 13a and 13b are locked with anti-drop pins 21a and 21b (see Figure 2 ). Thus, the pad pins 3a and 3b are prevented from coming out from the inner support holes 13a and 13b and the outer support holes 16a and 16b in the axial direction.

[0154] [Inner lining block and outer lining block]

[0155] The inner pad 4a and the outer pad 4b are arranged on both sides of the rotor 7 in the axial direction, and are suspended and supported with respect to the pair of pad pins 3a and 3b.

[0156] The inner liner 4a is arranged between the rotor 7 and the inner body 8 in the axial direction. The outer liner 4b is arranged between the rotor 7 and the outer body 9 in the axial direction.

[0157] The inner lining block 4 a and the outer lining block 4 b include a lining plate 22 and a metal backing plate 23 that supports the back surface of the lining plate 22 .

[0158] In this example, the inner lining block 4a and the outer lining block 4b are identical components of the same shape and size. Therefore, the detailed description of each part is only for the inner lining block 4a.

[0159] The lining plate 22 and the back plate 23 constituting the inner lining block 4a are symmetrically arranged with respect to the axis of symmetry α passing through the circumferential center (see Figure 6 ) has a line symmetrical shape. Therefore, the lining plate 22 and the back plate 23 have the same shape as each other in the half part on the side where the liner 22 is turned in and the half part on the side where the liner 22 is turned out.

[0160] The back plate 23 has flat torque transmission surfaces 24 a and 24 b on both outer side surfaces in the circumferential direction. The torque transmission surfaces 24 a and 24 b are located on the outer side of the liner plate 22 in the circumferential direction.

[0161] The back plate 23 has a pair of shoulders 25 a and 25 b at both circumferentially outer portions of the radially outer portion. The shoulders 25 a and 25 b extend radially outward from the liner plate 22 .

[0162] The shoulders 25a and 25b have guide holes 26a and 26b. The guide holes 26a and 26b are through holes formed by axially penetrating the shoulders 25a and 25b, and have a substantially rectangular shape when viewed in the axial direction. The circumferential width of the guide holes 26a and 26b is larger than the radial width. The radial width and circumferential width of the guide holes 26a and 26b are larger than the outer diameter of the pad pins 3a and 3b. The guide hole is not limited to a shape in which the periphery is closed, but can also be configured as a cutout shape in which the side surface of the shoulder is opened.

[0163] The axially outer side surfaces of the shoulders 25a and 25b of the inner pad 4a and the axially inner side surfaces of the shoulders 25a and 25b of the outer pad 4b are smooth surfaces.

[0164] The guide holes 26a and 26b provided in the back plate 23 are axially inserted with the pad pins 3a and 3b. Thus, the inner pad 4a and the outer pad 4b are supported to be movable in the axial direction relative to the brake caliper body 2. The torque transmission surface 24a provided on the side surface of the back plate 23 on the rotation-in side is circumferentially opposed to the torque receiving surface 18a provided on the extended wall portion 17a on the rotation-in side, and the torque transmission surface 24b provided on the side surface of the back plate 23 on the rotation-out side is circumferentially opposed to the torque receiving surface 18b provided on the extended wall portion 17b on the rotation-out side.

[0165] [Pad fixture]

[0166] The pad clamp 5 stabilizes the postures of the inner pad 4a and the outer pad 4b, and suppresses the inner pad 4a and the outer pad 4b from rattling when braking is not performed.

[0167] The pad clamp 5 is arranged radially outward of the inner pad 4a and the outer pad 4b, and presses both circumferential outer portions of the radially outer portions of the inner pad 4a and the outer pad 4b at least radially inward.

[0168] In this example, the pad fixture 5 only presses the shoulders 25a, 25b of the inner pad 4a and the outer pad 4b radially inward. However, the pad fixture may also be configured to press the inner pad and the outer pad radially inward and / or axially.

[0169] The pad clamp 5 presses the pair of pad pins 3 a and 3 b toward the radially outer side.

[0170] The pad fixture 5 is made of a metal plate having elasticity and corrosion resistance, such as a stainless steel plate.

[0171] The pad fixture 5 is integrally formed as a whole. In this example, the pad fixture 5 has a symmetrical shape in the circumferential direction and a symmetrical shape in the axial direction.

[0172] However, the pad clamp may also have a symmetrical shape in the circumferential direction and be configured as an asymmetrical shape in the axial direction. Alternatively, the pad clamp may also have an asymmetrical shape in the circumferential direction and be configured as a symmetrical shape in the axial direction. Alternatively, the pad clamp may also have an asymmetrical shape in the circumferential direction and be configured as an asymmetrical shape in the axial direction.

[0173] The pad clip 5 has engagement receiving parts 31a and 31b in the circumferential middle part. In this example, the pad clip 5 has two engagement receiving parts 31a and 31b. The engagement receiving parts 31a and 31b support the reaction force of the return springs 6a and 6b.

[0174] The pad clip 5 of this example further includes a base plate portion 27 , a pair of inner arm portions 28 a , 28 b , a pair of outer arm portions 29 a , 29 b , and a pair of support arm portions 30 a , 30 b .

[0175] The base plate portion 27 is disposed at a circumferentially intermediate portion of the pad clamp 5. The base plate portion 27 is disposed radially inward of the intermediate connection portion 11 of the caliper body 2 in the attached state of the pad clamp 5.

[0176] The base plate portion 27 has a substantially U-shaped end surface shape when viewed in the axial direction, and has a rectangular frame shape when viewed in the radial direction.

[0177] The engagement receiving portions 31 a and 31 b are provided on the base plate portion 27 .

[0178] The two engagement receiving portions 31 a and 31 b are arranged to be spaced apart from each other in the axial direction. The engagement receiving portions 31 a and 31 b are arranged in a circumferentially intermediate portion of the base plate portion 27 .

[0179] In this example, the engagement receiving parts 31a and 31b are formed of cut and raised pieces formed on the pad clamp 5. The engagement receiving parts 31a and 31b are formed into a substantially partial cylindrical shape having a central axis oriented in the circumferential direction and have a substantially J-shaped end surface shape when viewed in the circumferential direction.

[0180] The engagement receiving parts 31a, 31b are composed of rising parts 32a, 32b bent toward the radial outside and return parts 33a, 33b bent from the radial outside ends of the rising parts 32a, 32b toward the axial direction. The rising parts 32a, 32b have a roughly semi-cylindrical shape. The two rising parts 32a, 32b are bent in opposite directions in the axial direction. The return parts 33a, 33b have a flat plate shape. The two return parts 33a, 33b extend in opposite directions in the axial direction.

[0181] The base plate portion 27 has a hole portion 34 between the two engagement receiving portions 31a and 31b in the axial direction. The hole portion 34 radially penetrates a circumferential middle portion of the base plate portion 27. The hole portion 34 has a rectangular shape when viewed in the radial direction.

[0182] The hole 34 is formed by cutting and raising the engagement receiving portions 31a and 31b in the circumferential middle portion of the base plate 27. The two engagement receiving portions 31a and 31b are provided at the opening edges of the hole 34 on both sides in the axial direction.

[0183] The base plate portion 27 has flat plate-shaped connecting plate portions 35a and 35b respectively extending in the circumferential direction at both ends in the axial direction. The radially outer side surfaces of the connecting plate portions 35a and 35b are formed in a flat surface shape.

[0184] In order to realize the circumferential positioning of the pair of return springs 6 a and 6 b relative to the pad clamp 5 , the base plate portion 27 has a clamp-side positioning portion 36 .

[0185] The jig-side positioning portion 36 is composed of a pair of inclined plate portions 37 a and 37 b.

[0186] The pair of inclined plate portions 37a, 37b are provided at both outer ends of the base plate portion 27 in the circumferential direction and are elongated in the axial direction. The pair of inclined plate portions 37a, 37b are inclined so as to be radially outward as they are separated from each other in the circumferential direction.

[0187] The inner arm portions 28a and 28b extend circumferentially outward from the axially inner end of the base plate portion 27. The inner arm portions 28a and 28b have a substantially T-shape when viewed in the radial direction. The circumferentially outer portions of the inner arm portions 28a and 28b are inclined in a radially inward direction as they go toward the circumferential outer side.

[0188] The inner arm portions 28a and 28b have pad pressing portions 38a and 38b at the ends on the outer sides in the circumferential direction. The pad pressing portions 38a and 38b press the shoulders 25a and 25b of the inner pad 4a radially inward. The pad pressing portions 38a and 38b are curved so as to be convex radially inward.

[0189] The outer arm portions 29a and 29b extend circumferentially outward from the axially outer end of the base plate portion 27. The outer arm portions 29a and 29b have a substantially T-shape when viewed in the radial direction. The circumferentially outer portions of the outer arm portions 29a and 29b are inclined radially inward as they go circumferentially outward.

[0190] The outer arm portions 29a and 29b have pad pressing portions 39a and 39b at the ends on the outer sides in the circumferential direction. The pad pressing portions 39a and 39b press the shoulders 25a and 25b of the outer pad 4b radially inward. The pad pressing portions 39a and 39b are curved so as to be convex radially inward.

[0191] The support arm portions 30a and 30b extend outward in the circumferential direction from the axial middle portion of the base plate portion 27. The support arm portions 30a and 30b have a wave shape that undulates in the radial direction (plate thickness direction). The support arm portions 30a and 30b are inclined toward the radial inner side as they go toward the circumferential outer side, and are located radially inward compared to the inner arm portions 28a and 28b and the outer arm portions 29a and 29b.

[0192] The support arm portions 30a and 30b have pin pressing portions 40a and 40b in the circumferential middle portion. The pin pressing portions 40a and 40b press the axial middle portion of the pad pins 3a and 3b from the radial inner side toward the radial outer side. The pin pressing portions 40a and 40b are curved so that the outer peripheral surface shape is consistent with the pad pins 3a and 3b and the radial outer side is concave.

[0193] The pad clamp 5 is elastically deformed between the inner pad 4a and the outer pad 4b and the pair of pad pins 3a and 3b in the installed state. Specifically, the inner arm portions 28a and 28b and the outer arm portions 29a and 29b are bent and deformed radially outward based on the contact with the shoulders 25a and 25b of the inner pad 4a and the outer pad 4b, and the support arm portions 30a and 30b are bent and deformed radially inward based on the contact with the pad pins 3a and 3b.

[0194] Therefore, the pad clamp 5 uses the pad pressing parts 38a and 38b of the inner arm parts 28a and 28b to press the inner pad 4a toward the radial inside, and uses the pad pressing parts 39a and 39b of the outer arm parts 29a and 29b to press the outer pad 4b toward the radial inside, and uses the pin pressing parts 40a and 40b of the supporting arm parts 30a and 30b to press the pad pins 3a and 3b toward the radial outside. In other words, the pad clamp 5 uses the pad pins 3a and 3b as anchors (supporting the reaction force through the pad pins 3a and 3b) to apply a radially inward pressing force to the inner pad 4a and the outer pad 4b.

[0195] As a result, the inner peripheral surfaces of the guide holes 26a and 26b of the inner pad 4a and the outer pad 4b are pressed against the outer peripheral surfaces of the pad pins 3a and 3b. As a result, the postures of the inner pad 4a and the outer pad 4b are stabilized, and when not braking, the rattling sound (abnormal noise) caused by the shaking of the inner pad 4a and the outer pad 4b can be suppressed.

[0196] The pad clamp 5 protrudes between the inner pad 4a and the outer pad 4b and the pair of pad pins 3a and 3b in the installed state, thereby achieving axial, radial and circumferential positioning relative to the pair of pad pins 3a and 3b.

[0197] [Return spring]

[0198] The pair of return springs 6 a and 6 b press the inner pad 4 a and the outer pad 4 b in the direction away from the rotor 7 in the axial direction.

[0199] The pair of return springs 6 a and 6 b are made of a wire material such as spring steel, and are arranged spaced apart in the axial direction so that their respective longitudinal directions face the circumferential direction.

[0200] In this example, the pair of return springs 6a and 6b have a symmetrical shape in the circumferential direction with the circumferential center as the center. In addition, the return spring 6a arranged on the inner side in the axial direction and the other return spring 6b arranged on the outer side in the axial direction have a symmetrical shape in the axial direction. Therefore, the pair of return springs 6a and 6 are the same components with the same shape and the same size.

[0201] But, the return spring can also be configured as an asymmetric shape in the circumferential direction. In addition, a pair of return springs can also be configured as an asymmetric shape in the axial direction. As a pair of return springs, other parts with different wire diameters and / or shapes and / or sizes can also be used.

[0202] The return springs 6a and 6b have a substantially M-shape when viewed in the axial direction.

[0203] The return spring 6a is elastically deformed between the inner pad 4a and the pad holder 5 in the mounted state. The return spring 6a presses the inner pad 4a only in the direction away from the rotor 7 in the axial direction.

[0204] The return spring 6a has a pair of pressing parts 43a, 43b at the ends of both outer sides in the circumferential direction for pressing the inner liner block 4a, and has engaging parts 44a, 44b at the circumferential middle part, and the engaging parts 44a, 44b press the engaging receiving part 31a in the axial direction in the direction opposite to the pressing direction of the pair of pressing parts 43a, 43b. In this example, the return spring 6a has two engaging parts 44a, 44b.

[0205] The return spring 6a has a pair of spring arm portions 41a and 41b at both outer sides in the circumferential direction, and has a mounting portion 42 at a circumferential middle portion.

[0206] The spring arms 41a and 41b have a wave shape that undulates in the axial direction when viewed in the radial direction. The circumferentially inner half of the spring arms 41a and 41b is arranged radially outward of the inner arm 28a and 28b, and the circumferentially outer half of the spring arms 41a and 41b is arranged radially inward of the inner arm 28a and 28b. The circumferentially outer half of the spring arms 41a and 41b enters the radially inner side of the inner arm 28a and 28b from the axially outer side of the inner arm 28a and 28b.

[0207] The pressing portions 43 a and 43 b are provided at the ends of the spring arm portions 41 a and 41 b on the outer sides in the circumferential direction.

[0208] The pair of pressing portions 43a, 43b press portions of the axially outer side surfaces of the shoulders 25a, 25b of the inner liner 4a which are located near the guide holes 26a, 26b and radially outward of the outer peripheral edge of the rotor 7 from the axially outer side toward the axially inner side.

[0209] In this example, during the period when the liner plate 22 of the inner liner block 4a is worn from the new state to the service limit, the contact position between the inner liner block 4a and the pressing parts 43a, 43b is located near the guide holes 26a, 26b and radially outward from the outer peripheral edge of the rotor 7. Fig.17 As shown, the contact position between the inner lining block 4a and the pressing portion 43a (43b) is located near the circumferential outer side of the guide hole 26a (26b), and moves toward the circumferential outer side from the contact position T1 shown by the solid line when the lining plate 22 is in a new state, until it reaches the contact position T2 shown by the double dotted line when the lining plate 22 is worn to the limit of use.

[0210] The pressing portions 43a and 43b are substantially U-shaped and are curved so as to be convex inwardly in the axial direction. Therefore, when the liner 22 is worn, the pressing portions 43a and 43b smoothly move outward in the circumferential direction relative to the axial outer surfaces of the smooth shoulders 25a and 25b.

[0211] The mounting portion 42 is a portion for mounting the return spring 6a on the pad fixture 5, and is disposed radially outside the base plate portion 27. The mounting portion 42 has a crank shape when viewed in the radial direction.

[0212] The engaging portions 44 a and 44 b are provided on the mounting portion 42 .

[0213] The engagement portions 44a and 44b have a linear shape and are elongated in the circumferential direction. The two engagement portions 44a and 44b are spaced apart in the circumferential direction and are coaxially arranged.

[0214] The engaging portions 44 a and 44 b are arranged axially inside the rising portion 32 a and radially inside the return portion 33 a , and engage with the engagement receiving portion 31 a .

[0215] In this example, the return spring 6a has a curved seat portion 45 in the circumferential middle portion.

[0216] The curved seat portion 45 is provided on the mounting portion 42. Both circumferential side portions of the curved seat portion 45 are connected to the engaging portions 44a and 44b. The curved seat portion 45 is provided at the circumferential center portion of the return spring 6a.

[0217] The curved seat portion 45 is curved along the flat radially outer side surface of the connecting plate portion 35a. The curved seat portion 45 has a substantially U-shape when viewed in the radial direction. However, the curved seat portion may be configured in other shapes.

[0218] The return spring 6a is elastically deformed between the inner liner 4a and the liner clamp 5 in the installed state. Moreover, the pressing parts 43a and 43b press the inner liner 4a toward the axial inside, and the engaging parts 44a and 44b press the rising part 32a of the engaging bearing part 31a toward the axial outside. That is, the return spring 6a supports the inner liner 4a and the rising part 32a of the engaging bearing part 31a in the axial direction, and uses the engaging bearing part 31a as an anchor (supporting the reaction force through the rising part 32a) to apply a pressing force toward the axial inside to the inner liner 4a. In addition, the return spring 6a is pressed axially relative to the rising part 32a of the engaging bearing part 31a, thereby achieving axial positioning relative to the liner clamp 5.

[0219] In this example, the engaging portions 44a and 44b are arranged radially outward from the pressing portions 43a and 43b. Fig.15 The clockwise moment M1 acts on the return spring 6a. As a result, the engaging parts 44a and 44b press the return part 33a of the engaging bearing part 31a toward the radial outside, and the curved seat part 45 presses the radial outer side surface of the connecting plate part 35a toward the radial inside. That is, the engaging parts 44a and 44b and the curved seat part 45 are supported radially between the return part 33a of the engaging bearing part 31a and the connecting plate part 35a. As a result, the moment M1 acting on the return spring 6a is supported by the pad clamp 5, preventing the return spring 6a from rotating. In addition, the radial positioning of the return spring 6a relative to the pad clamp 5 is achieved.

[0220] Since the curved seat portion 45 is curved along the flat radially outer side surface of the connecting plate portion 35 a , the curved seat portion 45 abuts against the radially outer side surface of the connecting plate portion 35 a over a wide range, thereby stably supporting the moment M1 .

[0221] The return spring 6a is positioned in the circumferential direction relative to the pad clamp 5. To this end, the return spring 6a has a spring-side positioning portion 46, and the spring-side positioning portion 46 is engaged with the clamp-side positioning portion 36 provided on the pad clamp 5 in the circumferential direction.

[0222] The spring-side positioning portion 46 is composed of a pair of bent portions 47a and 47b.

[0223] The pair of bent portions 47a and 47b are provided at the ends of both outer sides of the mounting portion 42 in the circumferential direction. The pair of bent portions 47a and 47b are respectively extended in a manner that the more they are separated from each other in the circumferential direction, the more they are radially outward. The pair of bent portions 47a and 47b are arranged on the inner side of the pair of inclined plate portions 37a and 37b in the circumferential direction. In other words, the pair of inclined plate portions 37a and 37b are arranged on both outer sides of the pair of bent portions 47a and 47b in the circumferential direction.

[0224] In this example, the bent portion 47a on the inward side is engaged with the inclined plate portion 37a on the inward side in the circumferential direction, thereby preventing the return spring 6a from moving relative to the pad clamp 5 toward the inward side. In addition, the bent portion 47b on the outward side is engaged with the inclined plate portion 37b on the outward side in the circumferential direction, thereby preventing the return spring 6a from moving relative to the pad clamp 5 toward the outward side.

[0225] The return spring 6b is elastically deformed between the outer pad 4b and the pad holder 5 in the mounted state. The return spring 6b presses the outer pad 4b only in the direction away from the rotor 7 in the axial direction.

[0226] The return spring 6b has a pair of pressing parts 50a, 50b at the ends of both outer sides in the circumferential direction for pressing the outer pad 4b, and has engaging parts 51a, 51b at the circumferential middle part, and the engaging parts 51a, 51b press the engaging receiving part 31b in the axial direction in the direction opposite to the pressing direction of the pair of pressing parts 50a, 50b. In this example, the return spring 6b has two engaging parts 51a, 51b.

[0227] The return spring 6b has a pair of spring arm portions 48a and 48b at both outer sides in the circumferential direction, and has a mounting portion 49 at a circumferential middle portion.

[0228] The spring arms 48a and 48b have a wave shape that undulates in the axial direction when viewed in the radial direction. The circumferentially inner half of the spring arms 48a and 48b is arranged radially outward of the outer arm portions 29a and 29b, and the circumferentially outer half of the spring arms 48a and 48b is arranged radially inward of the outer arm portions 29a and 29b. The circumferentially outer half of the spring arms 48a and 48b enters the radially inner side of the outer arm portions 29a and 29b from the axially inner side of the outer arm portions 29a and 29b.

[0229] The pressing portions 50a and 50b are provided at the ends of the spring arm portions 48a and 48b on the outer sides in the circumferential direction.

[0230] The pair of pressing portions 50 a , 50 b press the axially inner side surfaces of the shoulders 25 a , 25 b of the outer pad 4 b from the axial inner side toward the axial outer side, which are located near the guide holes 26 a , 26 b and radially outward of the outer peripheral edge of the rotor 7 .

[0231] In this example, during the period when the lining plate 22 of the outer lining block 4b is worn from the new state to the use limit, the contact position between the outer lining block 4b and the pressing portions 50a, 50b is located near the guide holes 26a, 26b and radially outward from the outer peripheral edge of the rotor 7. The contact position between the outer lining block 4b and the pressing portions 50a, 50b is located near the circumferential outer side of the guide holes 26a, 26b, and the lining plate 22 moves from the contact position in the new state to the circumferential outer side until the contact position in the state where the lining plate 22 is worn to the use limit.

[0232] The pressing portions 50a, 50b are substantially U-shaped and are curved to be convex axially outward. Therefore, when the liner 22 is worn, the pressing portions 50a, 50b smoothly move circumferentially outward relative to the axially inner side surfaces of the smooth shoulders 25a, 25b.

[0233] In this example, the return spring 6a and the return spring 6b have symmetrical shapes in the axial direction, so the force of the pressing parts 43a and 43b of the return spring 6a pressing the inner liner 4a in the axial direction and the force of the pressing parts 50a and 50b of the return spring 6b pressing the outer liner 4b in the axial direction are in opposite directions and have the same magnitude in the axial direction. However, the magnitude and / or direction of the force of the pressing part of one return spring pressing the inner liner in the axial direction and the magnitude and / or direction of the force of the pressing part of another return spring pressing the outer liner in the axial direction may be different from each other.

[0234] The mounting portion 49 is a portion for mounting the return spring 6b on the pad fixture 5, and is disposed radially outside the base plate portion 27. The mounting portion 49 has a crank shape when viewed in the radial direction.

[0235] The engaging portions 51 a and 51 b are provided on the mounting portion 49 .

[0236] The engagement portions 51a and 51b have a linear shape and are elongated in the circumferential direction. The two engagement portions 51a and 51b are spaced apart in the circumferential direction and are coaxially arranged.

[0237] The engaging portions 51 a and 51 b are arranged axially outside the rising portion 32 b and radially inside the return portion 33 b , and engage with the engagement receiving portion 31 b .

[0238] In this example, the return spring 6b has a curved seat portion 52 in the circumferential middle portion.

[0239] The curved seat portion 52 is provided on the mounting portion 49. Both circumferential side portions of the curved seat portion 52 are connected to the engaging portions 51a and 51b. The curved seat portion 52 is provided at the circumferential center portion of the return spring 6b.

[0240] The curved seat portion 52 is curved along the flat radially outer side surface of the connecting plate portion 35b. The curved seat portion 52 has a substantially U-shape when viewed in the radial direction. However, the curved seat portion may be configured in other shapes.

[0241] The return spring 6b is elastically deformed between the outer lining block 4b and the lining block fixture 5 in the installed state. In addition, a pair of pressing portions 50a, 50b press the outer lining block 4b toward the axial outside, and the engaging portions 51a, 51b press the rising portion 32b of the engaging bearing portion 31b toward the axial inside. That is, the return spring 6b supports the outer lining block 4b and the rising portion 32b of the engaging bearing portion 31b in the axial direction, and uses the engaging bearing portion 31b as an anchor (supporting the reaction force through the rising portion 32b) to apply a pressing force toward the axial outside to the outer lining block 4b. In addition, the return spring 6b is pressed axially relative to the rising portion 32b of the engaging bearing portion 31b, thereby achieving axial positioning relative to the lining block fixture 5.

[0242] In this example, the engaging portions 51a and 51b are arranged radially outward from the pressing portions 50a and 50b. Fig.15 The moment M2 of the return spring 6b is counterclockwise. As a result, the engaging parts 51a and 51b are pressed radially outward against the return part 33b of the engaging bearing part 31b, and the curved seat part 52 is pressed radially inward against the radial outer side surface of the connecting plate part 35b. That is, the engaging parts 51a and 51b and the curved seat part 52 are supported radially between the return part 33b of the engaging bearing part 31b and the connecting plate part 35b. As a result, the moment M2 acting on the return spring 6b is supported by the pad clamp 5, preventing the return spring 6b from rotating. In addition, the radial positioning of the return spring 6b relative to the pad clamp 5 is achieved.

[0243] Since the curved seat portion 52 is curved along the flat radially outer side surface of the connecting plate portion 35 b , the curved seat portion 52 abuts against the radially outer side surface of the connecting plate portion 35 b over a wide range, thereby stably supporting the moment M2 .

[0244] The return spring 6b is positioned in the circumferential direction relative to the pad clamp 5. To this end, the return spring 6b has a spring-side positioning portion 53, and the spring-side positioning portion 53 is engaged with the clamp-side positioning portion 36 provided on the pad clamp 5 in the circumferential direction.

[0245] The spring-side positioning portion 53 is composed of a pair of bent portions 54 a and 54 b .

[0246] The pair of bent portions 54a and 54b are provided at the ends of both outer sides of the mounting portion 49 in the circumferential direction. The pair of bent portions 54a and 54b are respectively extended in a manner that the more they are separated from each other in the circumferential direction, the more they are radially outward. The pair of bent portions 54a and 54b are arranged on the inner side of the pair of inclined plate portions 37a and 37b in the circumferential direction. In other words, the pair of inclined plate portions 37a and 37b are arranged on both outer sides of the pair of bent portions 54a and 54b in the circumferential direction.

[0247] In this example, the bent portion 54a on the inward side is engaged with the inclined plate portion 37a on the inward side in the circumferential direction, thereby preventing the return spring 6b from moving relative to the pad clamp 5 toward the inward side. In addition, the bent portion 54b on the outward side is engaged with the inclined plate portion 37b on the outward side in the circumferential direction, thereby preventing the return spring 6b from moving relative to the pad clamp 5 toward the outward side.

[0248] [Assembly method of disc brake device]

[0249] Next, refer to Fig.30 A method of assembling the disc brake device 1 will be described.

[0250] First, if Fig.30 As shown in (A), a pair of return springs 6a and 6b are installed on the pad clamp 5. Specifically, the engagement parts 44a and 44b of the return spring 6a are engaged with the engagement receiving part 31a of the pad clamp 5, and the engagement parts 51a and 51b of the return spring 6b are engaged with the engagement receiving part 31b of the pad clamp 5.

[0251] Then, if Fig.30 As shown in (B), the spring arm 41a on the return spring 6a's turn-in side and the spring arm 48a on the return spring 6b's turn-in side are fixed by a band 55a while being elastically deformed in a manner close to the axial direction. In addition, the spring arm 41b on the return spring 6a's turn-out side and the spring arm 48b on the return spring 6b's turn-out side are fixed by a band 55b while being elastically deformed in a manner close to the axial direction. Thus, an assembly 56 consisting of the pad fixture 5 and a pair of return springs 6a and 6b is obtained.

[0252] Regarding the assembly 56, the axial distance L1 between the pressing portions 43a and 50a on the rotating-in side and the axial distance L2 between the pressing portions 43b and 50b on the rotating-out side are greater than the axial distance L3 between the axial outer side surface of the back plate 23 of the inner liner block 4a and the axial inner side surface of the back plate 23 of the outer liner block 4b when the liner plates 22 of the inner liner block 4a and the outer liner block 4b are new (see Fig.11 ) is small (L1<L3, L2<L3).

[0253] In addition to the process of manufacturing the assembly 56, a process of suspending and supporting the inner pad 4a and the outer pad 4b on the brake caliper body 2 by using a pair of pad pins 3a and 3b is also performed. Then, the assembly 56 is assembled radially outside the inner pad 4a and the outer pad 4b. Specifically, the pad fixture 5 constituting the assembly 56 is assembled between the inner pad 4a and the outer pad 4b and the pair of pad pins 3a and 3b while being elastically deformed.

[0254] Next, the bands 55a and 55b are cut or untied to allow the pair of return springs 6a and 6b to elastically return to their original state. Thus, the finished disc brake device 1 is obtained.

[0255] During braking, the disc brake device 1a of this example feeds brake fluid from the master cylinder to the inner cylinders 12a and 12b of the inner body 8 and the outer cylinders 15a and 15b outside the outer cylinder 9. As a result, the inner pistons 57a and 57b and the outer pistons 58a and 58b are pushed out from the inner cylinders 12a and 12b and the outer cylinders 15a and 15b in the axial direction, pressing the inner pads 4a and the outer pads 4b against the axial side surfaces of the rotor 7. As a result, the rotor 7 is strongly clamped from both axial sides, and the vehicle is braked.

[0256] During forward braking, the torque transmission surface 24b on the outward rotation side of the inner pad 4a and the outer pad 4b abuts against the torque receiving surface 18b on the outward rotation side, thereby supporting the braking tangential force. During reverse braking, the torque transmission surface 24a on the inward rotation side of the inner pad 4a and the outer pad 4b abuts against the torque receiving surface 18a on the inward rotation side, thereby supporting the braking tangential force.

[0257] In order to release the braking force of the disc brake device 1, the brake fluid is discharged from the inner cylinders 12a, 12b and the outer cylinders 15a, 15b. As a result, the inner pistons 57a, 57b and the outer pistons 58a, 58b retreat into the inner cylinders 12a, 12b and the outer cylinders 15a, 15b based on the elastic recovery of the piston seal. The inner lining block 4a and the outer lining block 4b retreat from the rotor 7 based on the pressing force of the pair of return springs 6a, 6b. As a result, it is possible to suppress the friction between the lining plates 22 of the inner lining block 4a and the outer lining block 4b and the axial side surfaces of the rotor 7.

[0258] According to the disc brake device 1 of this example, the force applied to the inner pad 4 a and the outer pad 4 b in the direction away from the rotor 7 can be set independently for each of the inner pad 4 a and the outer pad 4 b.

[0259] In this example, the pair of return springs 6a and 6b are made of wire material, and are arranged so as to be separated in the axial direction with their respective longitudinal directions oriented in the circumferential direction.

[0260] The return spring 6a has a pair of pressing parts 43a, 43b at the ends of both outer sides in the circumferential direction for pressing the inner liner 4a, and has engaging parts 44a, 44b at the middle part in the circumferential direction, and the engaging parts 44a, 44b press the engaging receiving part 31a in the axial direction in the direction opposite to the pressing direction of the pair of pressing parts 43a, 43b. Therefore, the return spring 6a is elastically deformed between the inner liner 4a and the liner clamp 5 in the installed state, and only presses the inner liner 4a in the axial direction away from the rotor 7.

[0261] The return spring 6b has a pair of pressing parts 50a, 50b at the ends of both outer sides in the circumferential direction for pressing the outer pad 4b, and has engaging parts 51a, 51b at the middle part in the circumferential direction, and the engaging parts 51a, 51b press the engaging receiving part 31b in the axial direction in the direction opposite to the pressing direction of the pair of pressing parts 50a, 50b. Therefore, the return spring 6b is elastically deformed between the outer pad 4b and the pad fixture 5 in the installed state, and only presses the outer pad 4b in the axial direction away from the rotor 7.

[0262] Therefore, according to the disc brake device 1 of this example, the force applied to the inner pad 4a and the outer pad 4b in the direction away from the rotor 7 can be set independently for each of the inner pad 4a and the outer pad 4b. Therefore, even if the force required to retract the inner pad 4a from the rotor 7 is different from the force required to retract the outer pad 4b from the rotor 7, the force required to retract from the rotor 7 can be applied to the inner pad 4a and the outer pad 4b.

[0263] In this example, the engaging portions 44a, 44b, 51a, 51b press the return portions 33a, 33b of the engaging receiving portions 31a, 31b toward the radial outside, and the bent seat portions 45, 52 press the radial outside surfaces of the connecting plate portions 35a, 35b toward the radial inside, so that the moments M1, M2 acting on the return springs 6a, 6b are supported by the pad clamp 5. Therefore, the return springs 6a, 6b are prevented from rotating. Therefore, the pressing force applied by the return springs 6a, 6b to the inner pad 4a and the outer pad 4b is prevented from becoming unstable.

[0264] The curved seat portions 45 and 52 are curved along the flat radially outer side surfaces of the connecting plate portions 35a and 35b. Therefore, the curved seat portions 45 and 52 abut against the radially outer side surfaces of the connecting plate portions 35a and 35b over a wide range, thereby stably supporting the moments M1 and M2.

[0265] When the inner pad 4a and the outer pad 4b are braked, the inner peripheral surface of the guide hole 26a, 26b slides on the pad pin 3a, 3b, and in contrast, the pressing parts 43a, 43b, 50a, 50b of the return springs 6a, 6b press the vicinity of the guide hole 26a, 26b in the axial side surface of the shoulder 25a, 25b. That is, the return springs 6a, 6b press the vicinity of the sliding part of the inner pad 4a and the outer pad 4b that slides relatively with the pad pin 3a, 3b. Therefore, the inner pad 4a and the outer pad 4b are not easily hooked on the pad pin 3a, 3b, and when the braking force of the disc brake device 1 is released, the inner pad 4a and the outer pad 4b smoothly retreat from the rotor 7.

[0266] Furthermore, during the period when the liner 22 is worn from the new state to the limit of use, the contact position between the inner liner 4a and the pressing portions 43a, 43b and the contact position between the outer liner 4b and the pressing portions 50a, 50b are located near the guide holes 26a, 26b. Therefore, during the period when the liner 22 is worn from the new state to the limit of use, the inner liner 4a and the outer liner 4b do not get caught on the liner pins 3a, 3b and are smoothly retracted from the rotor 7.

[0267] Since the engagement receiving parts 31a and 31b of the pad clamp 5 are formed of cut and raised pieces, the engagement receiving parts 31a and 31b can be easily processed. In addition, since the pad clamp 5 has a hole 34 between the two engagement receiving parts 31a and 31b, the pad clamp 5 can be made lighter and the heat of the rotor 7 can be easily released to the outside.

[0268] In the existing structure described in Japanese Patent Gazette No. 2009-222202, which uses a return spring that is roughly V-shaped when viewed in the radial direction, it is necessary to change the return spring when assembling it to a vehicle with a different rotor thickness. In contrast, when the disc brake device 1 of this example is assembled to a vehicle with a different rotor 7 thickness, it is not necessary to change the pair of return springs 6a, 6b but only to change the pad clamp 5, so that appropriate force can be applied to the inner pad 4a and the outer pad 4b.

[0269] In the assembly process of the disc brake device 1 , the pad clamp 5 and the pair of return springs 6 a and 6 b can be auxiliary assembled and handled as a single assembly 56 , so that the efficiency of the assembly work of the disc brake device 1 is improved.

[0270] In this example, the assembly body 56 has a symmetrical shape in the circumferential direction and the axial direction, so the assembly direction is not restricted. Therefore, the efficiency of the assembly work of the disc brake device 1 is further improved.

[0271] [Second example]

[0272] use Fig.31A second example of the embodiment of the present invention will be described.

[0273] In this example, the same components as those in the first example are denoted by the same reference numerals as those in the first example, and detailed descriptions thereof are omitted.

[0274] In this example, the inner liner block 4a (see Fig.11 ) of the return spring 6c and the pressing outer pad 4b (refer to Fig.11 ) has an asymmetric shape in the axial direction. Specifically, the shapes of one return spring 6c and the other return spring 6d are the same, but the wire diameters are different. Therefore, the magnitude of the force of the return spring 6c pressing the inner liner 4a in the axial direction is different from the magnitude of the force of the return spring 6d pressing the outer liner 4b in the axial direction.

[0275] In this example, the wire diameter D1 of the return spring 6c pressing the inner pad 4a is greater than the wire diameter D2 of the return spring 6d pressing the outer pad 4b. Therefore, the force of the return spring 6c pressing the inner pad 4a axially inward is greater than the force of the return spring 6d pressing the outer pad 4b axially outward.

[0276] The structure of this example is applied to a structure in which drag on the rotor 7 is more likely to occur in the inner liner block 4a than in the outer liner block 4b, thereby being able to effectively suppress the drag of the inner liner block 4a and the outer liner block 4b.

[0277] In a structure in which the inner liner 4a is more likely to drag the rotor than the inner liner, the wire diameter of the return spring pressing the outer liner can be larger than the wire diameter of the return spring pressing the inner liner, so that the force pressing the outer liner axially outward is greater than the force pressing the inner liner axially inward.

[0278] In this example, the pair of return springs have different wire diameters in order to make the magnitudes of the forces with which the pair of return springs press the pair of pads in the axial direction different. However, the pair of return springs may also have different shapes in addition or in lieu thereof.

[0279] The other structures and effects of the second example are the same as those of the first example.

Claims

1. A disc brake device, characterized in that: have: a brake caliper body having an inner body and an outer body; a pair of pad pins, the pair of pad pins are arranged circumferentially apart and parallel to each other at a position radially outward of the rotor, and are axially spanned between the inner body and the outer body; A pair of pads, the pair of pads being arranged at both sides of the rotor in the axial direction and being suspended and supported by a pair of pad pins; a pad clamp, the pad clamp being arranged radially outwardly of the pair of pads and pressing both circumferential outer portions of the radially outer portions of each of the pair of pads at least radially inwardly; and a pair of return springs, the pair of return springs pressing the pair of lining blocks in the axial direction away from the rotor, The pad clamp has an engagement receiving portion in the circumferential middle portion. The pair of return springs are made of wire and are arranged in a manner that their respective length directions are circumferentially oriented and separated in the axial direction. They respectively have a pair of pressing parts at the two outer ends in the circumferential direction for pressing the pad, and respectively have a clamping part in the middle part in the circumferential direction. The clamping part presses the clamping receiving part in the axial direction in the direction opposite to the pressing direction of the pair of pressing parts.

2. The disc brake device according to claim 1, characterized in that: The engagement portion is pressed radially outward by the engagement receiving portion.

3. The disc brake device according to claim 1, characterized in that: The lining block fixture is made of metal plate. The engagement receiving portion is constituted by a cut-and-raised piece formed on the pad clamp.

4. The disc brake device according to claim 3, characterized in that: The pad clamp includes: the two engagement receiving portions that are arranged to be spaced apart in the axial direction; and a hole portion that is arranged between the two engagement receiving portions in the axial direction and penetrates in the radial direction.

5. The disc brake device according to claim 1, characterized in that: The pad clamp presses the pair of pad pins toward the radial outer side.

6. The disc brake device according to claim 1, characterized in that: The pair of return springs have a curved seat portion at a circumferentially intermediate portion that is curved along the radially outer side surface of the flat surface of the pad holder.

7. The disc brake device according to claim 6, characterized in that: The curved seat portion is pressed radially inwardly against the radially outer side surface of the pad fixture.

8. The disc brake device according to claim 1, characterized in that: A pair of return springs realizes circumferential positioning relative to the pad clamp.

9. The disc brake device according to claim 8, characterized in that: A pair of the return springs has a spring side positioning portion, The pad clamp has a clamp side positioning portion, and the clamp side positioning portion is engaged with the spring side positioning portion in the circumferential direction. Based on the engagement between the spring-side positioning portion and the clamp-side positioning portion, the circumferential positioning of the pair of return springs relative to the pad clamp is achieved.

10. The disc brake device according to claim 9, characterized in that: The spring-side positioning portion includes a pair of bent portions, and the pair of bent portions are extended in a manner that they are separated from each other in the circumferential direction and extend radially outward. The jig-side positioning portion includes a pair of inclined plate portions, which are arranged at both outer sides of the pair of bent portions in the circumferential direction and are inclined so as to be radially outward as they are separated from each other in the circumferential direction.

11. The disc brake device according to claim 1, characterized in that: The pad has a guide hole for the pad pin to pass through. While the liner is worn from a new state to a service limit, the contact position between the liner and the pressing portion is located near the guide hole and radially outward of the outer peripheral edge of the rotor.

12. The disc brake device according to claim 1, characterized in that: The pair of return springs have symmetrical shapes in the circumferential direction with the circumferential center portion as the center.

13. The disc brake device according to claim 1, characterized in that: One of the pair of return springs and the other of the pair of return springs have symmetrical shapes in the axial direction.

14. The disc brake device according to claim 1, characterized in that: One of the pair of return springs and the other of the pair of return springs have an asymmetric shape in the axial direction.

15. The disc brake device according to claim 1, characterized in that: One of the pair of return springs and the other of the pair of return springs have different magnitudes of force that presses the pair of pads in the axial direction.

16. The disc brake device according to claim 1, characterized in that: The surface of the pad that contacts the pressing portion is a smooth surface.

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