Disc brake device

Abstract

To provide a disc brake device capable of setting force applied to a pair of pads in a direction separating from a rotor independently with respect to each pair of pads.SOLUTION: A pad clip 5 includes engagement reception parts 31a, 31b in an intermediate part in the circumferential direction. A pair of return springs 6a, 6b are made of a wire and disposed to separate from each other in the axial direction so that the respective longitudinal directions are located toward the circumferential direction. In each of the return springs, a pair of pressing parts for pressing pads 4a, 4b are provided at both outer end parts in the circumferential direction and engagement parts 44a, 44b, 51a, 51b for pressing the engagement reception parts 31a, 31b in a direction axially opposite to the pressing direction by the pair of pressing parts are provided in an intermediate part in the circumferential direction.SELECTED DRAWING: Figure 13

Description

[Technical field]

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

[0002] A disc brake device generates braking force by pushing a piston out of a cylinder of a caliper using brake fluid introduced into the cylinder, and by using the piston to press a pair of pads against both axial sides of a rotor.

[0003] When the braking force of the disc brake device is released, the brake fluid in the cylinder is discharged. As a result, the piston retracts into the cylinder based on the elastic restoration of the piston seal that seals between the piston and the cylinder. In addition, since the rotating rotor includes minute vibrations, the pair of pads retract from the rotor by contacting both axial sides of the rotor.

[0004] In recent years, in order to improve the fuel efficiency or electricity consumption of vehicles, there has been a demand to quickly retract a pair of pads from a rotor when the braking force of a disc brake device is released, thereby preventing the pair of pads from rubbing against both axial side surfaces of the rotor.

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

[0006] The return spring has a generally V-shape when viewed from the radial direction, and is sandwiched between the pair of pads while straddling the rotor from the radial outside. This allows the return spring to apply elastic force to the pair of pads in a direction away from the rotor. This allows the pair of pads to quickly retract from the rotor when the braking force of the disc brake is released. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2009-222202 A Summary of the Invention [Problem to be solved by the invention]

[0008] In the conventional structure described in JP 2009-222202 A, the return spring is sandwiched between a pair of pads while straddling the rotor from the radial outside, so that the return spring applies forces of the same magnitude in opposite directions to the axial direction to each pair of pads. Therefore, the force applied to each pair of pads in the direction away from the rotor cannot be set independently for each pair of pads.

[0009] An object of the present disclosure is to provide a disc brake device in which the force applied to a pair of pads in a direction away from a rotor can be set independently for each pair of pads. [Means for solving the problem]

[0010] A disc brake device according to one aspect of the present disclosure includes a caliper body, a pair of pad pins, a pair of pads, a pad clip, and a pair of return springs.

[0011] The caliper body has an inner body and an outer body.

[0012] The pair of pad pins are arranged radially outward from the rotor, circumferentially spaced apart and parallel to each other, and are axially suspended between the inner body and the outer body.

[0013] The pair of pads are disposed on both axial sides of the rotor and are suspended and supported by the pair of pad pins.

[0014] The pad clip is disposed radially outward from the pair of pads and presses both circumferential outer portions of the radial outer portions of each of the pair of pads at least radially inward.

[0015] The pair of return springs urge the pair of pads axially away from the rotor.

[0016] In the disc brake device according to one aspect of the present disclosure, the pad clip has an engagement receiving portion at a circumferential middle portion.

[0017] The pair of return springs are made of wire and are arranged axially spaced apart with their respective longitudinal directions oriented in the circumferential direction. Each of the return springs has a pair of pressing portions at both outer circumferential ends that press against the pad, and an engaging portion at a circumferential intermediate portion that presses the engagement receiving portion in the axial direction opposite to the pressing direction of the pair of pressing portions.

[0018] In the disc brake device according to one aspect of the present disclosure, the engagement portion is pressed radially outward against the engagement receiving portion.

[0019] In the disc brake device according to one aspect of the present disclosure, the pad clip is made of a metal plate, and the engagement receiving portion is formed of a cut-and-raised piece formed on the pad clip.

[0020] In a disc brake device according to one embodiment of the present disclosure, the pad clip has two engagement receiving portions arranged axially spaced apart, and a hole portion arranged between the two engagement receiving portions in the axial direction and penetrating in the radial direction.

[0021] In the disc brake device according to one aspect of the present disclosure, the pad clip presses the pair of pad pins radially outward.

[0022] In the disc brake device according to one aspect of the present disclosure, the pair of return springs have, at their circumferential middle portions, bent seats that are bent along the flat radially outer side surface of the pad clip.

[0023] In the disc brake device according to one aspect of the present disclosure, the bending seat portion is pressed radially inward against the radially outer surface of the pad clip.

[0024] In the disc brake device according to one aspect of the present disclosure, the pair of return springs are circumferentially positioned with respect to the pad clip.

[0025] In this case, the pair of return springs have spring-side positioning portions, and the pad clip has clip-side positioning portions that circumferentially engage with the spring-side positioning portions. The pair of return springs are circumferentially positioned with respect to the pad clip based on the engagement between the spring-side positioning portions and the clip-side positioning portions.

[0026] In this case, the spring-side positioning portion further comprises a pair of bent portions each extending radially outward as they move apart in the circumferential direction, and the clip-side positioning portion further comprises a pair of inclined plate portions disposed on both outer sides of the pair of bent portions in the circumferential direction and each inclined radially outward as they move apart in the circumferential direction.

[0027] In the disc brake device according to one aspect of the present disclosure, the pad has a guide hole through which the pad pin is inserted. The contact position between the pad and the pressing portion is located near the guide hole and radially outward from the outer circumferential edge of the rotor while the pad is worn down from a new state to its usage limit.

[0028] In the disc brake device according to one aspect of the present disclosure, the pair of return springs have a circumferentially symmetrical shape centered on the circumferential center.

[0029] In the disc brake device according to one aspect of the present disclosure, one of the pair of return springs and the other of the pair of return springs have a symmetrical shape in the axial direction.

[0030] In the disc brake device according to one aspect of the present disclosure, one of the pair of return springs and the other of the pair of return springs have an asymmetric shape in the axial direction.

[0031] In a disc brake device according to one aspect of the present disclosure, one of the pair of return springs and the other of the pair of return springs have different magnitudes of force that press the pair of pads in the axial direction.

[0032] In the disc brake device according to one aspect of the present disclosure, the surface of the pad that comes into contact with the pressing portion is a smooth surface. Effect of the Invention

[0033] According to the disc brake device according to one aspect of the present disclosure, the force applied to each pair of pads in the direction away from the rotor can be set independently for each pair of pads. [Brief description of the drawings]

[0034] [Figure 1] FIG. 1 is a front view of a disc brake device according to a first embodiment of the present disclosure, as viewed from the outside in the axial direction. [Diagram 2] FIG. 2 is a rear view of the disc brake device of the first example, as viewed from the inside in the axial direction. [Diagram 3]FIG. 3 is a side view of the disc brake device of the first example, as viewed from the rotation-in side. [Figure 4] FIG. 4 is a plan view of the disc brake device of the first example as viewed from the radial outside. [Diagram 5] FIG. 5 is a bottom view of the disc brake device of the first example as viewed from the radially inner side. [Figure 6] FIG. 6 is a cross-sectional view taken along line AA in FIG. [Figure 7] FIG. 7 is a partially enlarged view of FIG. [Figure 8] FIG. 8 is a perspective view of the disc brake device of the first example, as viewed from the radial outer side and the axial outer side. [Figure 9] FIG. 9 is a view of the disc brake device of the first example, seen from the outside in the axial direction, with the caliper body omitted. [Figure 10] FIG. 10 is a view of the disc brake device of the first example, seen from the axially inner side, with the caliper body omitted. [Figure 11] FIG. 11 is a view of the disc brake device of the first example, seen from the rotation side, with the caliper body omitted. [Figure 12] FIG. 12 is a view of the disc brake device of the first example, seen from the rotation side, with the caliper body omitted. [Figure 13] FIG. 13 is a view of the disc brake device of the first example, seen from the radially outer side, with the caliper body omitted. [Figure 14] FIG. 14 is a view of the disc brake device of the first example, seen from the radially inner side, with the caliper body omitted. [Figure 15] FIG. 15 is a cross-sectional view taken along line BB in FIG. [Figure 16] FIG. 16 is a view taken along the arrow C in FIG. [Figure 17] FIG. 17 is a partial enlarged view showing the shoulder portion of the pad in the first example. [Figure 18] FIG. 18 is a perspective view of the disc brake device of the first example, with the caliper body omitted, as viewed from the radial outer side and the axial outer side. [Figure 19]FIG. 19 is a view of the pad clip and a pair of return springs in an attached state as viewed from the outside in the axial direction in the first example. [Figure 20] FIG. 20 is a view of the pad clip and a pair of return springs in the attached state as viewed from the rotation-in side in the first example. [Figure 21] FIG. 21 is a view of the pad clip and a pair of return springs in the attached state as viewed from the rotation side in the first example. [Figure 22] FIG. 22 is a view of the pad clip and a pair of return springs in an attached state as viewed from the radially outside in the first example. [Figure 23] FIG. 23 is a view of the pad clip and a pair of return springs in an attached state as viewed from the radially inner side in the first example. [Figure 24] FIG. 24 is a perspective view of the pad clip and a pair of return springs in an attached state in the first example, as viewed from the radially outer side and the axially outer side. [Diagram 25] FIG. 25 is a perspective view of the pad clip in the attached state, as viewed from the radially outer side and the axially outer side, in the first example. [Figure 26] FIG. 26 is a view of the pair of return springs in the mounted state as viewed from the radially outer side in the first example. [Figure 27] FIG. 27 is a view of a pair of return springs in an attached state as viewed from the radially inner side in the first example. [Figure 28] FIG. 28 is a view of a pair of return springs in an installed state as viewed from the rotation-in side in the first example. [Figure 29] FIG. 29 is a view of a pair of return springs in an attached state as viewed from the rotation side in the first example. [Diagram 30] FIG. 30(A) is a diagram showing a state in which a pair of return springs are attached to a pad clip, and FIG. 30(B) is a diagram showing a state in which a band is attached to the pair of return springs. [Diagram 31] FIG. 31 is a diagram corresponding to FIG. 13 and relating to a second example of the embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] [Example 1] A first example of an embodiment of the present disclosure will be described with reference to FIGS. 1 to 30. FIG.

[0036] A disc brake device 1 according to one embodiment of the present disclosure is an opposed-piston type disc brake device, and is used for braking an automobile.

[0037] The disc brake device 1 includes a caliper body 2, a pair of pad pins 3a, 3b, a pair of pads, that is, an inner pad 4a and an outer pad 4b, a pad clip 5, and a pair of return springs 6a, 6b.

[0038] In this specification and claims, unless otherwise specified, the terms "axial direction," "circumferential direction," and "radial direction" refer to the axial direction, circumferential direction, and radial direction of the disk-shaped rotor 7 (see FIG. 4) that rotates together with the wheel. The axial outer side refers to the outer side in the width direction of the vehicle when the disc brake device 1 is attached to 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 attached to the vehicle. The circumferential outer side refers to both sides in the circumferential direction of the disc brake device 1, and the circumferential inner side refers to the circumferential center side of the disc brake device 1. Within the circumferential outer side, the side where the rotor 7 enters the caliper body 2 when the vehicle moves forward is particularly referred to as the rotation-in side, and the side where the rotor 7 exits the caliper body 2 when the vehicle moves forward is particularly referred to as the rotation-out side.

[0039] [Caliper body] The caliper body 2 has a generally arched shape when viewed in the axial direction, and supports a pair of pads 4a, 4b so that they can move in the axial direction. The caliper body 2 is disposed so as to cover a circumferential portion of the rotor 7 from the radially outer side, and is supported and fixed to a knuckle that constitutes the suspension device. The caliper body 2 is made of a light alloy such as an aluminum alloy or an iron-based alloy.

[0040] The caliper body 2 has an inner body 8 and an outer body 9 .

[0041] In addition to the inner body 8 and the outer body 9, the caliper body 2 further includes two connecting portions 10a, 10b and one intermediate connecting portion 11.

[0042] The inner body 8 is disposed axially inside the radially outer portion of the rotor 7. The inner body 8 has a plurality of inner cylinders 12a, 12b (two in the illustrated example) that open axially outward. The inner cylinders 12a, 12b communicate with each other through oil passages (not shown) provided inside the inner body 8. Inner pistons 57a, 57b are fitted into the inner cylinders 12a, 12b so as to be axially movable. The gap between the inner cylinders 12a, 12b and the inner pistons 57a, 57b is sealed by piston seals (not shown).

[0043] The inner body 8 has a pair of inner support holes 13a, 13b (see FIG. 4) on the radially outer side. The pair of inner support holes 13a, 13b are arranged circumferentially apart from each other and are arranged radially outside the inner cylinders 12a, 12b. The inner support holes 13a, 13b are through holes with central axes facing the axial direction.

[0044] The inner body 8 has a mounting seat 14 on its radially inner side. The caliper body 2 is fixed to the suspension system by utilizing the mounting seat 14.

[0045] The outer body 9 is disposed axially outward of the radially outer portion of the rotor 7. The outer body 9 has a plurality of outer cylinders 15a, 15b (two in the illustrated example) that open axially inward. The outer cylinders 15a, 15b communicate with each other through oil passages (not shown) provided inside the outer body 9. Outer pistons 58a, 58b are fitted into the outer cylinders 15a, 15b so as to be axially movable. The gap between the outer cylinders 15a, 15b and the outer pistons 58a, 58b is sealed by piston seals (not shown).

[0046] The outer body 9 has a pair of outer support holes 16a, 16b (see FIG. 4) on the radially outer side. The pair of outer support holes 16a, 16b are arranged circumferentially apart from each other and are arranged radially outside the outer cylinders 15a, 15b. The outer support holes 16a, 16b are through holes with central axes facing the axial direction.

[0047] Both circumferentially outer portions of the axially outer surface of the inner body 8 and both circumferentially outer portions of the axially inner surface of the outer body 9 are provided with a pair of protruding walls 17a, 17b (see FIG. 6) that protrude in the axial direction so as to approach the rotor 7. The protruding walls 17a, 17b have flat torque receiving surfaces 18a, 18b on their circumferentially inner surfaces.

[0048] The inner body 8 and the outer body 9 are constructed as separate bodies, and are connected in the axial direction by a plurality of connecting bolts 19. However, the caliper body may also be constructed as a monocoque structure in which the entire body is constructed as one unit.

[0049] The connecting parts 10a, 10b and the intermediate connecting part 11 are disposed radially outside the rotor 7 and connect the inner body 8 and the outer body 9 in the axial direction. One connecting part 10a is disposed on the rotation-in side of the caliper body 2 and connects the rotation-in side end of the inner body 8 to the rotation-in side end of the outer body 9 in the axial direction. The other connecting part 10b is disposed on the rotation-out side of the caliper body 2 and connects the rotation-out side end of the inner body 8 to the rotation-out side end of the outer body 9 in the axial direction. The intermediate connecting part 11 is disposed between the two connecting parts 10a, 10b in the circumferential direction and connects the circumferential middle part of the inner body 8 to the circumferential middle part of the outer body 9 in the axial direction.

[0050] [Pad pin] The pair of pad pins 3a, 3b are arranged radially outwardly of and circumferentially spaced apart from each other from the rotor 7. The pair of pad pins 3a, 3b are arranged parallel to each other with their central axes oriented in the axial direction.

[0051] The pair of pad pins 3a, 3b are bridged between the inner body 8 and the outer body 9 in the axial direction.

[0052] One pad pin 3a is inserted through the inner support hole 13a and the outer support hole 16a, and is disposed circumferentially between one connecting portion 10a and the intermediate connecting portion 11. The other pad pin 3b is inserted through the inner support hole 13b and the outer support hole 16b, and is disposed circumferentially between the other connecting portion 10b and the intermediate connecting portion 11.

[0053] The pad pins 3a and 3b are made of metal and have a generally cylindrical shape.

[0054] The pad pins 3a, 3b have heads 20a, 20b at their axially outer ends. The heads 20a, 20b have an outer diameter larger than the inner diameter of the outer support holes 16a, 16b. Anti-slip pins 21a, 21b (see FIG. 2) are engaged with the portions of the pad pins 3a, 3b that protrude axially inward from the inner support holes 13a, 13b. This prevents the pad pins 3a, 3b from coming out of the inner support holes 13a, 13b and the outer support holes 16a, 16b in the axial direction.

[0055] [Inner pad and outer pad] The inner pad 4a and the outer pad 4b are disposed on both axial sides of the rotor 7, and are supported by being suspended from a pair of pad pins 3a, 3b.

[0056] The inner pad 4a is disposed between the rotor 7 and the inner body 8 in the axial direction. The outer pad 4b is disposed between the rotor 7 and the outer body 9 in the axial direction.

[0057] The inner pad 4a and the outer pad 4b each include a lining 22 and a metal back plate 23 that supports the back surface of the lining 22.

[0058] In this embodiment, the inner pad 4a and the outer pad 4b are identical parts having the same shape and size, and therefore the detailed description of each part will be given only for the inner pad 4a.

[0059] The lining 22 and the back plate 23 constituting the inner pad 4a have a shape that is line-symmetrical with respect to a symmetry axis α (see FIG. 6) that passes through the circumferential center. Therefore, the lining 22 and the back plate 23 have the same shape in the inlet half and the outlet half.

[0060] The back plate 23 has flat torque transmission surfaces 24a, 24b on both outer side surfaces in the circumferential direction. The torque transmission surfaces 24a, 24b are located outside the lining 22 in the circumferential direction.

[0061] The back plate 23 has a pair of shoulders 25a, 25b on both circumferentially outer sides of a radially outer part. The shoulders 25a, 25b protrude radially outward beyond the lining 22.

[0062] The shoulder portions 25a, 25b have guide holes 26a, 26b. The guide holes 26a, 26b are through holes that penetrate the shoulder portions 25a, 25b in the axial direction and have a substantially rectangular shape when viewed in the axial direction. The guide holes 26a, 26b have a circumferential width greater than a radial width. The radial width and circumferential width of the guide holes 26a, 26b are greater than the outer diameters of the pad pins 3a, 3b. The guide holes are not limited to a shape that is closed around the periphery, and may be configured as a notch that opens on the side surface of the shoulder portion.

[0063] The axially outer surfaces of the shoulder portions 25a, 25b of the inner pad 4a and the axially inner surfaces of the shoulder portions 25a, 25b of the outer pad 4b are smooth surfaces.

[0064] The pad pins 3a, 3b are axially inserted into guide holes 26a, 26b provided in the back plate 23. As a result, the inner pad 4a and the outer pad 4b are supported so as to be axially movable relative to the caliper body 2. A torque transmission surface 24a provided on the side surface of the back plate 23 on the rotation-in side faces a torque receiving surface 18a provided on the protruding wall portion 17a on the rotation-in side in the circumferential direction, and a torque transmission surface 24b provided on the side surface of the back plate 23 on the rotation-out side faces a torque receiving surface 18b provided on the protruding wall portion 17b on the rotation-out side in the circumferential direction.

[0065] [Pad clip] The pad clip 5 stabilizes the posture of the inner pad 4a and the outer pad 4b, and suppresses rattling of the inner pad 4a and the outer pad 4b when no braking is being applied.

[0066] The pad clip 5 is disposed radially outward of the inner pad 4a and the outer pad 4b, and presses both circumferential outer parts of the radial outer parts of the inner pad 4a and the outer pad 4b at least radially inward.

[0067] In this example, the pad clip 5 presses the shoulders 25a, 25b of the inner pad 4a and the outer pad 4b only radially inward, however, the pad clip may be configured to press the inner pad and the outer pad in the circumferential and / or axial directions in addition to the radially inward direction.

[0068] The pad clip 5 presses the pair of pad pins 3a, 3b radially outward.

[0069] The pad clip 5 is made of a metal plate having elasticity and corrosion resistance, such as a stainless steel plate.

[0070] The pad clip 5 is constructed as a single piece. In this example, the pad clip 5 has a symmetrical shape in the circumferential direction and a symmetrical shape in the axial direction.

[0071] However, the pad clip may be configured to have a symmetric shape in the circumferential direction and an asymmetric shape in the axial direction. Alternatively, the pad clip may be configured to have an asymmetric shape in the circumferential direction and an asymmetric shape in the axial direction. Alternatively, the pad clip may be configured to have an asymmetric shape in the circumferential direction and an asymmetric shape in the axial direction.

[0072] The pad clip 5 has engagement receiving portions 31a, 31b at a circumferential intermediate portion. In this example, the pad clip 5 has two engagement receiving portions 31a, 31b. The engagement receiving portions 31a, 31b support the reaction forces of the return springs 6a, 6b.

[0073] The pad clip 5 of this example further includes a base plate portion 27, a pair of inner arm portions 28a, 28b, a pair of outer arm portions 29a, 29b, and a pair of support arm portions 30a, 30b.

[0074] The substrate portion 27 is disposed in a circumferential middle portion of the pad clip 5. The substrate portion 27 is disposed radially inside the intermediate connecting portion 11 of the caliper body 2 when the pad clip 5 is in an attached state.

[0075] The substrate portion 27 has a generally U-shaped end face shape when viewed in the axial direction, and has a rectangular frame shape when viewed in the radial direction.

[0076] The engagement receiving portions 31a and 31b are provided on the base plate portion 27.

[0077] The two engagement receiving portions 31a, 31b are disposed at a circumferentially intermediate portion of the base plate portion 27. The engagement receiving portions 31a, 31b are disposed at a distance from each other in the axial direction.

[0078] In this example, the engagement receiving portions 31a, 31b are formed of cut-and-raised pieces formed on the pad clip 5. The engagement receiving portions 31a, 31b are configured in a substantially partial cylindrical shape having a central axis facing in the circumferential direction, and have an end face shape that is substantially J-shaped when viewed in the circumferential direction.

[0079] The engagement receiving portions 31a, 31b are composed of rising portions 32a, 32b bent radially outward, and return portions 33a, 33b bent axially from the radially outer ends of the rising portions 32a, 32b. The rising portions 32a, 32b have a substantially semi-cylindrical shape. The two rising portions 32a, 32b are bent in opposite directions with respect to the axial direction. The return portions 33a, 33b have a flat plate shape. The two return portions 33a, 33b extend in opposite directions with respect to the axial direction.

[0080] The base plate portion 27 has a hole 34 between the two engagement receiving portions 31a, 31b in the axial direction. The hole 34 penetrates radially through a circumferential middle portion of the base plate portion 27. The hole 34 has a rectangular shape when viewed in the radial direction.

[0081] The hole is formed when the engagement receiving portions 31a, 31b are cut and raised in the circumferential middle portion of the base plate portion 27. The two engagement receiving portions 31a, 31b are provided on the opening edge portions on both axial sides of the hole .

[0082] The base plate portion 27 has flat connecting plate portions 35a, 35b extending in the circumferential direction at both axial ends. The radially outer surfaces of the connecting plate portions 35a, 35b are formed in a flat surface shape.

[0083] The base plate portion 27 has a clip side positioning portion 36 for positioning the pair of return springs 6a, 6b relative to the pad clip 5 in the circumferential direction.

[0084] The clip side positioning portion 36 is made up of a pair of inclined plate portions 37a and 37b.

[0085] The pair of inclined plate portions 37a, 37b are provided at both outer circumferential ends of the base plate portion 27 and extend in the axial direction. The pair of inclined plate portions 37a, 37b are each inclined radially outward as they move away from each other in the circumferential direction.

[0086] The inner arm portions 28a, 28b each extend circumferentially outward from an axially inner end of the base portion 27. The inner arm portions 28a, 28b are generally T-shaped when viewed in the radial direction. The circumferential outer portions of the inner arm portions 28a, 28b are inclined radially inward as they extend circumferentially outward.

[0087] The inner arm portions 28a, 28b have pad pressing portions 38a, 38b at their circumferentially outer ends. The pad pressing portions 38a, 38b press the shoulder portions 25a, 25b of the inner pad 4a radially inward. The pad pressing portions 38a, 38b are curved so that the radially inward side is convex.

[0088] The outer arm portions 29a, 29b each extend circumferentially outward from an axially outer end of the base portion 27. The outer arm portions 29a, 29b are generally T-shaped when viewed in the radial direction. The circumferential outer portions of the outer arm portions 29a, 29b are inclined radially inward as they extend circumferentially outward.

[0089] The outer arm portions 29a, 29b have pad pressing portions 39a, 39b at their circumferentially outer ends. The pad pressing portions 39a, 39b press the shoulder portions 25a, 25b of the outer pad 4b radially inward. The pad pressing portions 39a, 39b are curved so that the radially inward side is convex.

[0090] The support arms 30a, 30b each extend circumferentially outward from an axially intermediate portion of the base plate portion 27. The support arms 30a, 30b have a wave shape that undulates in the radial direction (thickness direction). The support arms 30a, 30b are inclined radially inward as they extend circumferentially outward, and are positioned radially inward of the inner arm portions 28a, 28b and the outer arm portions 29a, 29b.

[0091] The support arms 30a, 30b have pin pressing portions 40a, 40b at their circumferential middle portions. The pin pressing portions 40a, 40b press the axial middle portions of the pad pins 3a, 3b from the radial inside to the radial outside. The pin pressing portions 40a, 40b are curved so that the radial outside is concave to match the outer peripheral surface shape of the pad pins 3a, 3b.

[0092] In the attached state, the pad clip 5 elastically deforms between the inner pad 4a and the outer pad 4b and the pair of pad pins 3a, 3b. Specifically, the inner arm portions 28a, 28b and the outer arm portions 29a, 29b flex and deform radially outward based on contact with the shoulder portions 25a, 25b of the inner pad 4a and the outer pad 4b, and the support arm portions 30a, 30b flex and deform radially inward based on contact with the pad pins 3a, 3b.

[0093] Therefore, the pad clip 5 presses the inner pad 4a radially inward with the pad pressing portions 38a, 38b of the inner arm portions 28a, 28b, presses the outer pad 4b radially inward with the pad pressing portions 39a, 39b of the outer arm portions 29a, 29b, and presses the pad pins 3a, 3b radially outward with the pin pressing portions 40a, 40b of the support arm portions 30a, 30b. In other words, the pad clip 5 applies a pressing force radially inward to the inner pad 4a and the outer pad 4b, using the pad pins 3a, 3b as anchors (the pad pins 3a, 3b support the reaction force).

[0094] As a result, the inner peripheral surfaces of the guide holes 26a, 26b of the inner pad 4a and the outer pad 4b are pressed against the outer peripheral surfaces of the pad pins 3a, 3b. This stabilizes the posture of the inner pad 4a and the outer pad 4b, and suppresses the generation of rattle noise (abnormal noise) caused by the rattling of the inner pad 4a and the outer pad 4b when braking is not being applied.

[0095] When the pad clip 5 is attached, it is pressed between the inner pad 4a and the outer pad 4b and the pair of pad pins 3a, 3b, thereby being positioned axially, radially and circumferentially with respect to the pair of pad pins 3a, 3b.

[0096] [Return spring] The pair of return springs 6a, 6b press the inner pad 4a and the outer pad 4b in a direction away from the rotor 7 in the axial direction.

[0097] The pair of return springs 6a, 6b are made of wire material such as spring steel, and are arranged spaced apart in the axial direction with their respective longitudinal directions extending in the circumferential direction.

[0098] In this example, the pair of return springs 6a, 6b are symmetrical in the circumferential direction with the circumferential center at the center. The return spring 6a, which is located on the axially inner side, and the other return spring 6b, which is located on the axially outer side, are symmetrical in the axial direction. Therefore, the pair of return springs 6a, 6b are identical parts with the same shape and size.

[0099] However, the return spring may be configured to have an asymmetric shape in the circumferential direction. Also, the pair of return springs may be configured to have an asymmetric shape in the axial direction. Separate parts having different wire diameters and / or shapes and / or sizes may also be used as the pair of return springs.

[0100] The return springs 6a and 6b are substantially M-shaped when viewed in the axial direction.

[0101] In the attached state, the return spring 6a is elastically deformed between the inner pad 4a and the pad clip 5. The return spring 6a presses only the inner pad 4a in a direction away from the rotor 7 in the axial direction.

[0102] The return spring 6a has a pair of pressing portions 43a, 43b at both outer circumferential ends that press the inner pad 4a, and has engagement portions 44a, 44b at a circumferential intermediate portion that press the engagement receiving portion 31a in the axial direction opposite to the pressing direction of the pair of pressing portions 43a, 43b. In this example, the return spring 6a has two engagement portions 44a, 44b.

[0103] The return spring 6a has a pair of spring arms 41a, 41b on both outer circumferential sides, and also has a mounting portion 42 at a circumferential intermediate portion.

[0104] The spring arms 41a, 41b have a wave shape that undulates in the axial direction when viewed in the radial direction. The circumferential inner halves of the spring arms 41a, 41b are disposed radially outside the inner arm portions 28a, 28b, and the circumferential outer halves of the spring arms 41a, 41b are disposed radially inside the inner arm portions 28a, 28b. The circumferential outer halves of the spring arms 41a, 41b enter the radial inside of the inner arm portions 28a, 28b from the axial outside of the inner arm portions 28a, 28b.

[0105] The pressing portions 43a, 43b are provided at the circumferentially outer ends of the spring arm portions 41a, 41b.

[0106] The pair of pressing portions 43a, 43b press portions of the axially outer surfaces of the shoulder portions 25a, 25b of the inner pad 4a that are located near the guide holes 26a, 26b and radially outer than the outer circumferential edge of the rotor 7 from the axially outer side toward the axially inner side.

[0107] In this example, the contact position between the inner pad 4a and the pressing portions 43a, 43b is located near the guide holes 26a, 26b and radially outward from the outer circumferential edge of the rotor 7 until the lining 22 of the inner pad 4a is worn down from a new state to its usage limit. As shown in Fig. 17, the contact position between the inner pad 4a and the pressing portion 43a (43b) is located near the circumferential outer side of the guide hole 26a (26b) and moves circumferentially outward from the contact position T1 shown by the solid line when the lining 22 is new to the contact position T2 shown by the two-dot chain line when the lining 22 is worn down to its usage limit.

[0108] The pressing portions 43a, 43b are substantially U-shaped and bent so that the axially inner side is convex. Therefore, when the lining 22 is worn, the pressing portions 43a, 43b smoothly move circumferentially outward relative to the axially outer side surfaces of the shoulder portions 25a, 25b, which are smooth surfaces.

[0109] The attachment portion 42 is a portion for attaching the return spring 6a to the pad clip 5, and is disposed radially outside the base plate portion 27. The attachment portion 42 has a crank shape when viewed in the radial direction.

[0110] The engagement portions 44a, 44b are provided on the attachment portion 42.

[0111] The engaging portions 44a, 44b have a linear shape and extend in the circumferential direction. The two engaging portions 44a, 44b are arranged coaxially and spaced apart from each other in the circumferential direction.

[0112] The engaging portions 44a, 44b are disposed axially inward of the rising portion 32a and radially inward of the return portion 33a, and engage with the engaging receiving portion 31a.

[0113] In this example, the return spring 6a has a bent seat portion 45 at the circumferential intermediate portion.

[0114] The bend seat portion 45 is provided on the mounting portion 42. Both circumferential side portions of the bend seat portion 45 are connected to the engagement portions 44a, 44b. The bend seat portion 45 is provided in the circumferential center portion of the return spring 6a.

[0115] The bent seat portion 45 is bent along the flat radially outer surface of the connecting plate portion 35a. The bent seat portion 45 has a substantially U-shape when viewed in the radial direction. However, the bent seat portion may be configured in other shapes.

[0116] In the mounted state, the return spring 6a elastically deforms between the inner pad 4a and the pad clip 5. The pressing portions 43a, 43b press the inner pad 4a axially inward, and the engaging portions 44a, 44b press the rising portion 32a of the engagement receiving portion 31a axially outward. That is, the return spring 6a braces itself in the axial direction between the inner pad 4a and the rising portion 32a of the engagement receiving portion 31a, and applies a pressing force axially inward to the inner pad 4a, using the engagement receiving portion 31a as an anchor (the rising portion 32a supports the reaction force). The return spring 6a is pressed in the axial direction against the rising portion 32a of the engagement receiving portion 31a, thereby being positioned in the axial direction with respect to the pad clip 5.

[0117] In this example, the engagement parts 44a, 44b are disposed radially outward from the pressing parts 43a, 43b. Therefore, a clockwise moment M1 in FIG. 15 acts on the return spring 6a. As a result, the engagement parts 44a, 44b are pressed radially outward against the return part 33a of the engagement receiving part 31a, and the bent seat part 45 is pressed radially inward against the radially outer surface of the connecting plate part 35a. That is, the engagement parts 44a, 44b and the bent seat part 45 are radially stretched between the return part 33a of the engagement receiving 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 clip 5, and the return spring 6a is prevented from rotating. In addition, the radial positioning of the return spring 6a with respect to the pad clip 5 is achieved.

[0118] Since the bent seat portion 45 is bent along the flat radially outer surface of the connecting plate portion 35a, the bent seat portion 45 and the radially outer surface of the connecting plate portion 35a abut over a wide area, and the moment M1 is stably supported.

[0119] The return spring 6a is positioned in the circumferential direction with respect to the pad clip 5. For this purpose, the return spring 6a has a spring side positioning portion 46 that circumferentially engages with a clip side positioning portion 36 provided on the pad clip 5.

[0120] The spring side positioning portion 46 is made up of a pair of bent portions 47a, 47b.

[0121] The pair of bent portions 47a, 47b are provided at both circumferentially outer ends of the mounting portion 42. The pair of bent portions 47a, 47b extend radially outward as they move away from each other in the circumferential direction. The pair of bent portions 47a, 47b are disposed inside the pair of inclined plate portions 37a, 37b in the circumferential direction. In other words, the pair of inclined plate portions 37a, 37b are disposed outside the pair of bent portions 47a, 47b in the circumferential direction.

[0122] In this example, the bent portion 47a on the rotation-in side and the inclined plate portion 37a on the rotation-in side engage in the circumferential direction, thereby preventing the return spring 6a from moving relative to the pad clip 5 toward the rotation-in side. Also, the bent portion 47b on the rotation-out side and the inclined plate portion 37b on the rotation-out side engage in the circumferential direction, thereby preventing the return spring 6a from moving relative to the pad clip 5 toward the rotation-out side.

[0123] In the attached state, the return spring 6b is elastically deformed between the outer pad 4b and the pad clip 5. The return spring 6b presses only the outer pad 4b in a direction away from the rotor 7 in the axial direction.

[0124] The return spring 6b has a pair of pressing portions 50a, 50b at both outer circumferential ends that press the outer pad 4b, and also has engagement portions 51a, 51b at a circumferential intermediate portion that press the engagement receiving portion 31b in the axial direction opposite to the pressing direction of the pair of pressing portions 50a, 50b. In this example, the return spring 6b has two engagement portions 51a, 51b.

[0125] The return spring 6b has a pair of spring arms 48a, 48b on both circumferential outer sides, and also has a mounting portion 49 in the circumferential middle portion.

[0126] The spring arms 48a, 48b have a wave shape that undulates in the axial direction when viewed in the radial direction. The circumferential inner halves of the spring arms 48a, 48b are disposed radially outside the outer arms 29a, 29b, and the circumferential outer halves of the spring arms 48a, 48b are disposed radially inside the outer arms 29a, 29b. The circumferential outer halves of the spring arms 48a, 48b enter the radial inside of the outer arms 29a, 29b from the axial inside of the outer arms 29a, 29b.

[0127] The pressing portions 50a, 50b are provided at the circumferentially outer ends of the spring arms 48a, 48b.

[0128] The pair of pressing portions 50a, 50b press portions of the axially inner surface of the shoulder portions 25a, 25b of the outer pad 4b that are located near the guide holes 26a, 26b and radially outer than the outer peripheral edge of the rotor 7 from the axially inner side toward the axially outer side.

[0129] In this example, the contact position between the outer pad 4b and the pressing portions 50a, 50b is located near the guide holes 26a, 26b and radially outward from the outer circumferential edge of the rotor 7 until the lining 22 of the outer pad 4b is worn down from a new state to its usage limit. The contact position between the outer pad 4b and the pressing portions 50a, 50b is located near the circumferential outer side of the guide holes 26a, 26b and moves circumferentially outward from the contact position when the lining 22 is new to the contact position when the lining 22 is worn down to its usage limit.

[0130] The pressing portions 50a, 50b are substantially U-shaped and bent so that the axially outer side is convex. Therefore, when the lining 22 wears, the pressing portions 50a, 50b smoothly move circumferentially outward relative to the axially inner side surfaces of the shoulder portions 25a, 25b, which are smooth surfaces.

[0131] In this example, the return springs 6a and 6b have symmetrical shapes in the axial direction, so the force with which the pressing portions 43a, 43b of the return spring 6a press the inner pad 4a in the axial direction and the force with which the pressing portions 50a, 50b of the return spring 6b press the outer pad 4b in the axial direction are in opposite directions and have the same magnitude. However, the magnitude and / or direction of the force with which the pressing portion of one return spring presses the inner pad in the axial direction and the magnitude and / or direction of the force with which the pressing portion of the other return spring presses the outer pad in the axial direction can be made different from each other.

[0132] The attachment portion 49 is a portion for attaching the return spring 6b to the pad clip 5, and is disposed radially outward of the base plate portion 27. The attachment portion 49 has a crank shape when viewed in the radial direction.

[0133] The engagement portions 51 a and 51 b are provided on the attachment portion 49 .

[0134] The engaging portions 51a and 51b are linear and extend in the circumferential direction. The two engaging portions 51a and 51b are spaced apart from each other in the circumferential direction and are arranged coaxially.

[0135] The engaging portions 51a, 51b are disposed axially outward of the rising portion 32b and radially inward of the return portion 33b, and engage with the engaging receiving portion 31b.

[0136] In this example, the return spring 6b has a bent seat portion 52 in the circumferential middle portion.

[0137] The bend seat portion 52 is provided on the mounting portion 49. Both circumferential side portions of the bend seat portion 52 are connected to the engagement portions 51a, 51b. The bend seat portion 52 is provided in the circumferential center portion of the return spring 6b.

[0138] The bent seat portion 52 is bent along the flat radially outer surface of the connecting plate portion 35b. The bent seat portion 52 has a substantially U-shape when viewed in the radial direction. However, the bent seat portion may be configured in other shapes.

[0139] In the mounted state, the return spring 6b elastically deforms between the outer pad 4b and the pad clip 5. The pair of pressing portions 50a, 50b press the outer pad 4b axially outward, and the engaging portions 51a, 51b press the rising portion 32b of the engagement receiving portion 31b axially inward. That is, the return spring 6b braces itself in the axial direction between the outer pad 4b and the rising portion 32b of the engagement receiving portion 31b, and applies a pressing force axially outward to the outer pad 4b using the engagement receiving portion 31b as an anchor (bearing a reaction force from the rising portion 32b). The return spring 6b is also axially pressed against the rising portion 32b of the engagement receiving portion 31b, thereby being positioned in the axial direction with respect to the pad clip 5.

[0140] In this example, the engagement parts 51a, 51b are disposed radially outward from the pressing parts 50a, 50b. Therefore, a moment M2 rotating counterclockwise in FIG. 15 acts on the return spring 6b. As a result, the engagement parts 51a, 51b are pressed radially outward against the return part 33b of the engagement receiving part 31b, and the bent seat part 52 is pressed radially inward against the radially outer surface of the connecting plate part 35b. That is, the engagement parts 51a, 51b and the bent seat part 52 are radially stretched between the return part 33b of the engagement receiving 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 clip 5, and the return spring 6b is prevented from rotating. In addition, the radial positioning of the return spring 6b with respect to the pad clip 5 is achieved.

[0141] Since the bent seat portion 52 is bent along the flat radially outer surface of the connecting plate portion 35b, the bent seat portion 52 and the radially outer surface of the connecting plate portion 35b abut against each other over a wide area, and the moment M2 is stably supported.

[0142] The return spring 6b is positioned in the circumferential direction with respect to the pad clip 5. For this purpose, the return spring 6b has a spring side positioning portion 53 that engages with the clip side positioning portion 36 provided on the pad clip 5 in the circumferential direction.

[0143] The spring side positioning portion 53 is made up of a pair of bent portions 54a and 54b.

[0144] The pair of bent portions 54a, 54b are provided at both circumferentially outer ends of the mounting portion 49. The pair of bent portions 54a, 54b extend radially outward as they move away from each other in the circumferential direction. The pair of bent portions 54a, 54b are disposed inside the pair of inclined plate portions 37a, 37b in the circumferential direction. In other words, the pair of inclined plate portions 37a, 37b are disposed outside the pair of bent portions 54a, 54b in the circumferential direction.

[0145] In this example, the bent portion 54a on the rotation-in side and the inclined plate portion 37a on the rotation-in side engage in the circumferential direction, thereby preventing the return spring 6b from moving relative to the pad clip 5 toward the rotation-in side. Also, the bent portion 54b on the rotation-out side and the inclined plate portion 37b on the rotation-out side engage in the circumferential direction, thereby preventing the return spring 6b from moving relative to the pad clip 5 toward the rotation-out side.

[0146] [Method of assembling the disc brake device] Next, a method of assembling the disc brake device 1 will be described with reference to FIG.

[0147] 30(A), a pair of return springs 6a, 6b are attached to the pad clip 5. Specifically, the engagement portions 44a, 44b of the return spring 6a are engaged with the engagement receiving portion 31a of the pad clip 5, and the engagement portions 51a, 51b of the return spring 6b are engaged with the engagement receiving portion 31b of the pad clip 5.

[0148] Next, as shown in Fig. 30(B), the spring arm 41a on the turn-in side of the return spring 6a and the spring arm 48a on the turn-in side of the return spring 6b are fixed with a band 55a in a state where they are elastically deformed so as to approach each other in the axial direction. Also, the spring arm 41b on the turn-out side of the return spring 6a and the spring arm 48b on the turn-out side of the return spring 6b are fixed with a band 55b in a state where they are elastically deformed so as to approach each other in the axial direction. This results in an assembly 56 consisting of the pad clip 5 and the pair of return springs 6a, 6b.

[0149] With respect to the assembly 56, the axial distance L1 between the pressing parts 43a, 50a on the inlet side and the axial distance L2 between the pressing parts 43b, 50b on the outlet side are set to be smaller than the axial distance L3 (see FIG. 11) between the axial outer side surface of the back plate 23 of the inner pad 4a and the axial inner side surface of the back plate 23 of the outer pad 4b when the linings 22 of the inner pad 4a and the outer pad 4b are in a new state (L1 <L3、L2<L3)。

[0150] Separate from the process of manufacturing the assembly 56, a process of suspending and supporting the inner pad 4a and the outer pad 4b by a pair of pad pins 3a, 3b is performed on the caliper body 2. Then, the assembly 56 is attached to the radial outside of the inner pad 4a and the outer pad 4b. Specifically, the pad clip 5 constituting the assembly 56 is attached between the inner pad 4a, the outer pad 4b and the pair of pad pins 3a, 3b while being elastically deformed.

[0151] Next, the bands 55a, 55b are cut or released to allow the pair of return springs 6a, 6b to elastically restore their original state, thereby obtaining the completed disc brake device 1.

[0152] In the disc brake device 1a of this embodiment, during braking, brake fluid is sent from a master cylinder to the inner cylinders 12a, 12b provided in the inner body 8 and the outer cylinders 15a, 15b provided in the outer body 9. This causes the inner pistons 57a, 57b and the outer pistons 58a, 58b to be pushed out in the axial direction from the inner cylinders 12a, 12b and the outer cylinders 15a, 15b, respectively, and presses the inner pad 4a and the outer pad 4b against both axial side surfaces of the rotor 7. As a result, the rotor 7 is tightly clamped from both axial sides, and the vehicle is braked.

[0153] During forward braking, the torque transmission surface 24b on the rotation output side provided on the inner pad 4a and the outer pad 4b abuts against the torque receiving surface 18b on the rotation output side to support the brake tangential force. During reverse braking, the torque transmission surface 24a on the rotation input side provided on the inner pad 4a and the outer pad 4b abuts against the torque receiving surface 18a on the rotation input side to support the brake tangential force.

[0154] 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 restoration of the piston seals. The inner pad 4a and the outer pad 4b retreat from the rotor 7 based on the pressing force of the pair of return springs 6a, 6b. This prevents the linings 22 of the inner pad 4a and the outer pad 4b from rubbing against both axial side surfaces of the rotor 7.

[0155] According to the disc brake device 1 of this embodiment, 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.

[0156] In this example, the pair of return springs 6a, 6b are made of wire and are arranged with their longitudinal directions oriented in the circumferential direction and spaced apart from each other in the axial direction.

[0157] The return spring 6a has a pair of pressing portions 43a, 43b at both outer circumferential ends that press the inner pad 4a, and also has engagement portions 44a, 44b at a circumferential intermediate portion that press the engagement receiving portion 31a in the opposite axial direction to the pressing direction of the pair of pressing portions 43a, 43b. Therefore, in the mounted state, the return spring 6a elastically deforms between the inner pad 4a and the pad clip 5, and presses only the inner pad 4a in the axial direction away from the rotor 7.

[0158] The return spring 6b has a pair of pressing portions 50a, 50b at both outer circumferential ends that press the outer pad 4b, and also has engagement portions 51a, 51b at a circumferential intermediate portion that press the engagement receiving portion 31b in the opposite axial direction to the pressing direction of the pair of pressing portions 50a, 50b. Therefore, in the mounted state, the return spring 6b elastically deforms between the outer pad 4b and the pad clip 5, and presses only the outer pad 4b in the axial direction away from the rotor 7.

[0159] Therefore, according to the disc brake device 1 of this embodiment, 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 differs from the force required to retract the outer pad 4b from the rotor 7, the force required to retract the inner pad 4a from the rotor 7 can be applied to each of the inner pad 4a and the outer pad 4b.

[0160] In this example, the engaging portions 44a, 44b, 51a, 51b are pressed radially outward against the return portions 33a, 33b of the engaging receiving portions 31a, 31b, and the bent seat portions 45, 52 are pressed radially inward against the radially outer surfaces of the connecting plate portions 35a, 35b, so that the moments M1, M2 acting on the return springs 6a, 6b are supported by the pad clip 5. This prevents the return springs 6a, 6b from rotating. This prevents the pressing forces applied from the return springs 6a, 6b to the inner pad 4a and the outer pad 4b from becoming unstable.

[0161] Since the bending seats 45, 52 are bent along the flat radially outer surfaces of the connecting plate portions 35a, 35b, the bending seats 45, 52 and the radially outer surfaces of the connecting plate portions 35a, 35b abut over a wide area, thereby stably supporting the moments M1, M2.

[0162] During braking, the inner peripheral surfaces of the guide holes 26a, 26b of the inner pad 4a and the outer pad 4b slide against the pad pins 3a, 3b, while the pressing portions 43a, 43b, 50a, 50b of the return springs 6a, 6b press the portions of the axial side surfaces of the shoulder portions 25a, 25b near the guide holes 26a, 26b. In other words, the return springs 6a, 6b press the portions of the inner pad 4a and the outer pad 4b near the sliding portions with the pad pins 3a, 3b. Therefore, the inner pad 4a and the outer pad 4b are less likely to get caught on the pad pins 3a, 3b, and the inner pad 4a and the outer pad 4b smoothly retreat from the rotor 7 when the braking force of the disc brake device 1 is released.

[0163] Furthermore, the contact positions of the inner pad 4a and the pressing portions 43a, 43b and the contact positions of the outer pad 4b and the pressing portions 50a, 50b are located near the guide holes 26a, 26b until the lining 22 is worn down from a new state to its usage limit. Therefore, the inner pad 4a and the outer pad 4b smoothly retreat from the rotor 7 without getting caught on the pad pins 3a, 3b until the lining 22 is worn down from a new state to its usage limit.

[0164] The engagement receiving portions 31a, 31b of the pad clip 5 are formed by cut and raised pieces, so that the processing work of the engagement receiving portions 31a, 31b can be easily performed. In addition, the pad clip 5 has a hole 34 between the two engagement receiving portions 31a, 31b, so that the pad clip 5 is light in weight and the heat of the rotor 7 can easily escape to the outside.

[0165] In the conventional structure described in JP 2009-222202 A, which uses a return spring that is approximately V-shaped when viewed in the radial direction, the return spring needs to be changed when the disc brake device 1 of this example is installed in a vehicle with a rotor 7 of a different thickness, but by simply changing the pad clip 5, it is possible to apply an appropriate force to the inner pad 4a and outer pad 4b without changing the pair of return springs 6a, 6b, even when the disc brake device 1 is installed in a vehicle with a rotor 7 of a different thickness.

[0166] In the process of assembling the disc brake device 1, the pad clip 5 and the pair of return springs 6a, 6b can be sub-assembled and handled as a single assembly 56, thereby improving the efficiency of the assembly work of the disc brake device 1.

[0167] In this example, the assembly 56 has a symmetrical shape in the circumferential and axial directions, and is therefore not restricted in the assembling direction, which further improves the efficiency of the assembly work of the disc brake device 1.

[0168] [Example 2] A second example of the embodiment of the present disclosure will be described with reference to FIG.

[0169] In this example, the same components as those in the first example are given the same reference numerals as those in the first example, and detailed explanations thereof will be omitted.

[0170] In this example, the return spring 6c that presses the inner pad 4a (see FIG. 11) and the return spring 6d that presses the outer pad 4b (see FIG. 11) have asymmetric shapes in the axial direction. Specifically, the return spring 6c and the return spring 6d have the same shape but different wire diameters. Therefore, the magnitude of the force with which the return spring 6c presses the inner pad 4a in the axial direction differs from the magnitude of the force with which the return spring 6d presses the outer pad 4b in the axial direction.

[0171] In this example, the wire diameter D1 of the return spring 6c that presses the inner pad 4a is larger than the wire diameter D2 of the return spring 6d that presses the outer pad 4b. Therefore, the force with which the return spring 6c presses the inner pad 4a axially inward is larger than the force with which the return spring 6d presses the outer pad 4b axially outward.

[0172] The structure of this example is applied to a structure in which drag on the rotor 7 is more likely to occur on the inner pad 4a than on the outer pad 4b, and thus drag on the inner pad 4a and the outer pad 4b can be effectively suppressed.

[0173] In a structure in which drag against the rotor is more likely to occur in the outer pad than in the inner pad, the wire diameter of the return spring pressing against the outer pad can be made larger than the wire diameter of the return spring pressing against the inner pad, so that the force pressing the outer pad axially outward is greater than the force pressing the inner pad axially inward.

[0174] In this example, the wire diameters of the pair of return springs are made different from each other to differentiate the magnitude of the force with which the pair of return springs press against the pair of pads in the axial direction. However, additionally or alternatively, the shapes of the pair of return springs can also be made different.

[0175] The other configurations and effects of the second example are the same as those of the first example. [Explanation of symbols]

[0176] 1 Disc brake device 2 Caliper body 3a, 3b Pad pins 4a Inner Pad 4b Outer pad 5 Pad Clip 6a, 6b, 6c, 6d Return spring 7 Rotor 8 Inner Body 9 Outer Body 10a, 10b connection part 11 Intermediate connection 12a, 12b Inner cylinder 13a, 13b Inner support hole 14 Mounting seat 15a, 15b Outer cylinder 16a, 16b Outer side support hole 17a, 17b Overhang wall section 18a, 18b Torque receiving surface 19 Connecting bolt 20a, 20b head 21a, 21b Locking pin 22 Lining 23 Back plate 24a, 24b Torque transmission surface 25a, 25b Shoulder 26a, 26b Guide holes 27 Circuit Board 28a, 28b Inner arm 29a, 29b Outer arm 30a, 30b Support arm 31a, 31b Engagement receiving part 32a, 32b Rising part 33a, 33b Return part 34 Hole 35a, 35b connecting plate part 36 Clip side positioning part 37a, 37b Slanted plate part 38a, 38b Pad pressing portion 39a, 39b Pad pressing portion 40a, 40b Pin pressing portion 41a, 41b Spring arm 42 Mounting part 43a, 43b Pressing portion 44a, 44b Engagement part 45 Bent seat 46 Spring side positioning part 47a, 47b Bending part 48a, 48b Spring arm 49 Mounting part 50a, 50b Pressing portion 51a, 51b engaging part 52 Bent seat 53 Spring side positioning part 54a, 54b Bending part 55a, 55b band 56 Assembly 57a, 57b Inner piston 58a, 58b Outer piston

Claims

1. a caliper body having an inner body and an outer body; a pair of pad pins arranged radially outwardly of the rotor, circumferentially spaced apart from each other and parallel to each other, and axially extending between the inner body and the outer body; a pair of pads disposed on both axial sides of the rotor and suspended from the pair of pad pins; a pad clip disposed radially outward from the pair of pads and pressing both circumferential outer portions of the radial outer portions of each of the pair of pads at least radially inward; a pair of return springs that axially urge the pair of pads in a direction away from the rotor; The pad clip has an engagement receiving portion at a circumferential intermediate portion, the pair of return springs are made of wire, and are arranged axially spaced apart with their respective longitudinal directions oriented in the circumferential direction, and each of the return springs has a pair of pressing portions at both outer circumferential ends for pressing the pad, and an engaging portion at a circumferential intermediate portion for pressing the engagement receiving portion in a direction opposite to the pressing direction of the pair of pressing portions with respect to the axial direction; Disc brake device.

2. The disc brake device according to claim 1 , wherein the engaging portion is pressed radially outward against the engaging receiving portion.

3. The pad clip is made of a metal plate, The engagement receiving portion is a cut-and-raised piece formed on the pad clip.

2. A disc brake device according to claim 1.

4. 4. The disc brake device according to claim 3, wherein the pad clip has two engagement receiving portions arranged axially apart, and a hole portion arranged between the two engagement receiving portions in the axial direction and penetrating in the radial direction.

5. 2. The disc brake device according to claim 1, wherein the pad clip presses the pair of pad pins radially outward.

6. 2. The disc brake device according to claim 1, wherein the pair of return springs have, at circumferential intermediate portions, bent seats that are bent along the flat radially outer side surface of the pad clip.

7. The disc brake device according to claim 6 , wherein the bending seat portion is pressed radially inward against the radially outer surface of the pad clip.

8. 2. The disc brake device according to claim 1, wherein the pair of return springs are circumferentially positioned relative to the pad clip.

9. The pair of return springs have spring side positioning portions, the pad clip has a clip-side positioning portion that circumferentially engages with the spring-side positioning portion, The pair of return springs are circumferentially positioned with respect to the pad clip based on engagement between the spring side positioning portions and the clip side positioning portions.

9. A disk brake device according to claim 8.

10. the spring side positioning portion is composed of a pair of bent portions each extending radially outward as they move apart in the circumferential direction, The clip side positioning portion is arranged on both outer sides of the pair of bent portions in the circumferential direction, and is composed of a pair of inclined plate portions each inclined radially outward as they move away from each other in the circumferential direction.

10. A disc brake device according to claim 9.

11. the pad has a guide hole through which the pad pin is inserted, a contact position between the pad and the pressing portion is located near the guide hole and is located radially outward of an outer circumferential edge of the rotor while the pad is worn down from a new state to a usage limit; 2. A disc brake device according to claim 1.

12. 2. The disc brake device according to claim 1, wherein the pair of return springs have shapes symmetrical in the circumferential direction about a circumferential center portion.

13. 2. The disc brake device according to claim 1, wherein one of the pair of return springs and the other of the pair of return springs have symmetrical shapes in an axial direction.

14. 2. The disc brake device according to claim 1, wherein 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. 2. The disc brake device according to claim 1, wherein 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.

16. 2. The disc brake device according to claim 1, wherein the surface of the pad with which the pressing portion comes into contact is a smooth surface.

Images