Opposed piston disc brake device

Abstract

In the present invention, an ear portion (32) of a brake pad (6a) is fitted into a recessed guide groove (22) provided on a guide wall portion (19a) of a brake caliper (5) so as to be movable in the axial direction. As the brake pad clip (7), a member is used that comprises: a base portion (34) that forms an approximately rectangular C-shape in the axial direction and fits into the recessed guide groove (22) so as to surround the ear portion (32); an elastic member (35) having one end connected to the base portion (34) and disposed circumferentially further outward in the recessed guide groove (22) than the base portion (34); and a pressing member (36) extending circumferentially inward from the other end of the elastic member (35) and pressing the brake pad (6a) in the direction away from a rotor (4) relative to the axial direction by means of the elastic force of the elastic member (35).

Description

Technical field

[0001] The present invention relates to an opposed-piston disc brake device. State of the art

[0002] Disc brake systems are widely used because they have excellent heat dissipation properties and allow for fine adjustment of braking force while driving.

[0003] The disc brake system generates braking force by pressing a pair of brake pads, located on both axial sides of a rotor rotating with the wheel, against both axial side faces of the rotor by a piston. When the brake is released, the elastic restoring force of the piston seal pulls the piston back into the deep side of the cylinder, and the axial side face of the rotating and wobbling rotor pushes the brake pad away from the rotor in one direction. This separates the brake pads from the rotor and ensures a clearance between the brake pads and the rotor.

[0004] Unless otherwise specified, the terms axial direction, radial direction and circumferential direction refer to the axial direction, radial direction and circumferential direction of the rotor.

[0005] If the brake pads are pressed against the axial side face of the rotor, they may not be able to move smoothly away from the rotor and may tilt. If the brake pads tilt in this way, they may not separate sufficiently from the rotor, and rubbing between the brake pads and the rotor can become a problem.

[0006] In view of these circumstances, consideration was given to integrating a brake pad clip into the disc brake device and separating the brake pads from the rotor by utilizing the elastic force of the brake pad clip when releasing the brake.

[0007] WO2014 / 097098A1 (Patent Reference 1) discloses a structure for an opposed-piston disc brake device in which a brake pad clip arranged on the radial outside of the brake pad is used to separate the brake pad from the rotor when the brake is released. In particular, a portion of the brake pad clip that presses against the outer circumferential edge section of the brake pad is designed as a chamfered surface, thereby pushing the brake pad away from the rotor in the direction of the radial inside and also in the axial direction.

[0008] JP2016-28216A (Patent Reference 2) discloses a structure for a floating disc brake device in which a brake pad clip attached to the rear of the brake pad is used to separate the brake pad from the rotor when the brake is released. Specifically, a brake pad clip, having an approximately rectangular C-shape when viewed radially, is arranged on the rear of the brake pad, with the end section on one side of the brake pad clip being attached to the rear of the brake pad and the end section on the other side of the brake pad clip bearing against a surface that, in the axial direction within the holder, points in the direction opposite to the rotor. In this way, the elastic force of the brake pad clip, which is elastically deformed during the braking process, is used to pull the brake pad away from the rotor when the brake is released. List of cited documents Patent literature Patent literature 1: WO2014 / 097098A1 Patent Literature 2: JP2016-28216A Summary of the invention; Technical task

[0009] The structure described in WO2014 / 097098A1 presses the brake pad with an axial force using the chamfered surface of the brake pad clip, resulting in insufficient axial pressing force, making it difficult to sufficiently separate the brake pad from the rotor.

[0010] In contrast, the structure described in JP2016-28216A can exert sufficient tensile force on the brake pad to separate it from the rotor. However, because the brake pad clip must be located on the back of the brake pad, it is difficult to use this in a structure such as an opposed-piston disc brake device, where the caliper body is located close to the back of the brake pad and no clearance can be guaranteed for the placement of the brake pad clip on the back of the brake pad.

[0011] The present invention was created to solve the above-mentioned problems, and its objective is to provide an opposed-piston disc brake device in which a brake pad clip can be arranged without affecting other elements, and in which the brake pad clip can exert a sufficient axial pressure force on the brake pad to separate the brake pad from the rotor. Solution to the task

[0012] An opposed-piston disc brake device according to one aspect of the present invention comprises a brake caliper, a brake pad and a brake pad clip.

[0013] The brake caliper has two or more cylinders and is configured to be attached to a suspension device.

[0014] The brake pad is mounted in such a way that it is movable in the axial direction with respect to the brake caliper.

[0015] The brake pad clip consists of a metal plate and is positioned between the brake caliper and the brake pad.

[0016] The brake caliper comprises a guide wall section on a part adjacent to a circumferential outer surface of the brake pad, wherein the guide wall section has a circumferential side surface facing the brake pad in the circumferential direction and an axial side surface facing a rotor in the axial direction.

[0017] The guide wall section comprises a guide concave groove extending circumferentially and has a circumferential opening section opening on the circumferential side surface and an axial opening section opening on the axial side surface.

[0018] The brake pad includes a projection section configured to engage axially with the guide concave groove in order to be movable.

[0019] The brake pad clip has an essentially rectangular C-shape when viewed in the axial direction and comprises a base section which is inserted into the guide concave groove to surround the attachment section, an elastic section which has an end section on one side which is connected to the base section and which is located on the outer circumferential side of the base section in the guide concave groove, and a pressure section which extends from an end section on the other side of the elastic section to an inner circumferential side and is configured to push the brake pad away from the rotor in an axial direction by means of an elastic force of the elastic section.

[0020] In the opposed-piston disc brake device according to the aspect of the present invention, the elastic section can be formed in a partially cylindrical shape (half-cylindrical, half-long cylindrical and half-elliptical cylindrical shapes) which, viewed in the radial direction, is essentially C-shaped (including U-shaped).

[0021] Otherwise, the elastic section may be formed in an essentially J-shape, an essentially V-shape, an essentially M-shape, or the like when viewed in the radial direction.

[0022] In the opposed-piston disc brake device according to the aspect of the present invention, the base section can comprise an outer circumferential side plate section arranged along an outer circumferential wall surface facing a radial inside in the guide concave groove, an inner circumferential side plate section arranged along an inner circumferential wall surface facing a radial outside in the guide concave groove, and a connecting plate section connecting end sections on the outer circumferential sides of each of the outer circumferential side plate sections and the inner circumferential side plate sections, and the end section on one side of the elastic section can be connected to an end section on a side that is further away from the rotor (opposite rotor side) in the axial direction in the connecting plate section.

[0023] In the opposed-piston disc brake device according to the aspect of the present invention, the end section on the side that is further away from the rotor in the axial direction can be arranged closer to the rotor side in the connecting plate section than the end section on the side that is further away from the rotor in the axial direction, on the outer circumferential side plate section and the inner circumferential side plate section.

[0024] In this case, the end section on one side of the elastic section can be located closer to the rotor side than the end section on the side that is further away from the rotor in the axial direction, in the outer circumferential side plate section and the inner circumferential side plate section.

[0025] In the opposed-piston disc brake device according to the aspect of the present invention, the brake pad clip can further comprise an outwardly bent plate section, which is bent from the end section on the circumferential inner side of the outer circumferential side plate section towards the radial outside, and an inwardly bent plate section, which is bent from the end section on the circumferential inner side of the inner circumferential side plate section towards the radial inside.

[0026] Otherwise, in the opposed-piston disc brake device according to the aspect of the present invention, it is possible to have only one of the outwardly bent plate sections, or only the inwardly bent plate section, or neither the outwardly bent plate section nor the inwardly bent plate section.

[0027] In the opposed-piston disc brake device according to the aspect of the present invention, the outwardly bent plate section can be folded at a right angle to the outer circumferential side plate section, and the inwardly bent plate section can be folded at a right angle to the inner circumferential side plate section. Alternatively, the bending angle of the outwardly bent plate section with respect to the outer circumferential side plate section and the bending angle of the inwardly bent plate section with respect to the inner circumferential side plate section can be different from each other.

[0028] Furthermore, the outwardly curved plate section and the inwardly curved plate section can be arranged at the same circumferential position or offset from each other in the circumferential direction.

[0029] In the opposed-piston disc brake device according to the aspect of the present invention, an outer circumferential groove extending in the circumferential direction can be provided on the outer circumferential wall surface of the guide concave groove, and a claw section configured to engage with the outer circumferential groove can be provided on the outer circumferential side plate section. Alternatively, an outer radial groove extending in the radial direction can be provided on a radial outer side portion of the circumferential opening section of the guide concave groove on the circumferential side surface of the guide wall section, and a claw section configured to engage with the outer radial groove can be provided on the outwardly curved plate section.

[0030] In the opposed-piston disc brake device according to the aspect of the present invention, the outer circumferential groove can extend linearly in the circumferential direction, and its axial position can remain unchanged regardless of the circumferential position, or it can be inclined in the axial direction towards the rotor or the opposite side of the rotor as it moves towards the outer circumference. Furthermore, the groove width and groove depth of the outer circumferential groove can be constant over its entire length in the circumferential direction or can be configured differently depending on the circumferential position.

[0031] In the opposed-piston disc brake device according to the aspect of the present invention, the outer radial groove can extend linearly in the radial direction, and its axial position can remain unchanged regardless of its radial position, or it can be inclined in the direction of the rotor or the opposite side of the rotor as it moves towards the radial outer side. Furthermore, the groove width and depth of the outer radial groove can be constant along its entire length in the radial direction or can vary depending on its radial position.

[0032] In the opposed-piston disc brake device according to the aspect of the present invention, an inner circumferential groove extending in the circumferential direction can be provided on the inner circumferential wall surface of the guide concave groove, and a claw section configured to engage with the inner circumferential groove can be provided on the inner circumferential side plate section. Alternatively, an inner radial groove extending in the radial direction can be provided on a radial inner portion of the circumferential opening section of the guide concave groove on the circumferential side surface of the guide wall section, and a claw section configured to engage with the inner radial groove can be provided on the inwardly curved plate section.

[0033] In the opposed-piston disc brake device according to the aspect of the present invention, the inner circumferential groove can extend linearly in the circumferential direction, and its axial position can remain unchanged regardless of the circumferential position, or it can be inclined in the axial direction towards the rotor or the opposite side of the rotor as it moves towards the outer circumferential side. Furthermore, the groove width and groove depth of the inner circumferential groove can be constant over its entire length in the circumferential direction or can be configured differently depending on the circumferential position.

[0034] In the opposed-piston disc brake device according to the aspect of the present invention, the inner radial groove can extend linearly in the radial direction, and its axial position can remain unchanged regardless of its radial position, or it can be inclined in the axial direction towards the rotor or counter-rotor side as it moves towards the radial inner side. Furthermore, the groove width and depth of the inner radial groove can be constant along its entire length in the radial direction or can vary depending on its radial position.

[0035] In the opposed-piston disc brake device according to the aspect of the present invention, an outer radial groove extending in the radial direction can be provided on the radial outer side part of the circumferential opening section of the guide concave groove on the circumferential side surface of the guide wall section, and a claw section configured to engage with the outer radial groove can be provided on the outwardly bent plate section.

[0036] Additionally, an inner circumferential groove extending in the circumferential direction can be provided on the inner circumferential wall surface of the guide concave groove, and a claw section configured to engage with the inner circumferential groove can be provided on the inner circumferential side plate section.

[0037] In the opposed-piston disc brake device according to the aspect of the present invention, an outer radial groove extending in the radial direction can be provided on the radial outer side part of the circumferential opening section of the guide concave groove on the circumferential side surface of the guide wall section, and a claw section configured to engage with the outer radial groove can be provided on the outwardly bent plate section.

[0038] Additionally, an inner radial groove extending in the radial direction can be provided on a radial inner part of the circumferential opening section of the guide concave groove on the circumferential side surface of the guide wall section, and a claw section configured to engage with the inner radial groove can be provided on the inwardly bent plate section.

[0039] It should be noted that the groove bottom surface of the outer radial groove and the groove bottom surface of the inner radial groove can be arranged on the same imaginary cylindrical surface.

[0040] In the opposed-piston disc brake device according to the aspect of the present invention, the connecting plate section may have a notch at an end section on a side that is closer to the rotor in the axial direction, and part of the elastic section or part of the pressure section may be arranged on an inside of the notch.

[0041] In the opposed-piston disc brake device according to the aspect of the present invention, at least one of the inwardly curved plate sections and the outwardly curved plate sections can have a pressure-receiving section configured to absorb a torque acting on the brake pad during braking.

[0042] If the inwardly curved plate section includes both the claw section and the pressure-receiving section, the pressure-receiving section can be located on the radial inside of the claw section.

[0043] If the outwardly curved plate section includes both the claw section and the pressure-receiving section, the pressure-receiving section can be located on the radial outside of the claw section.

[0044] In the opposed-piston disc brake device according to the aspect of the present invention, neither the elastic section nor the pressure section may protrude from the axial opening section of the guide concave groove in the axial direction to one side of the rotor.

[0045] In the opposed-piston disc brake device according to the aspect of the present invention, the elastic section can comprise a cut-out section.

[0046] The cut-out section can have a function to relieve the stress acting on the elastic section and can, for example, be a slot formed on the intermediate section in the width direction of the elastic section, or a notch formed on end sections on both sides in the width direction of the elastic section.

[0047] In the opposed-piston disc brake device according to the aspect of the present invention, the pressure section can be configured to press an axial side surface of the attachment section of the brake pad.

[0048] In the opposed-piston disc brake device according to the aspect of the present invention, a curved section in which a surface on an opposite side of the rotor is a convex surface in the axial direction can be provided at the end section on the circumferential inner side of the pressure section. Advantageous effects of the invention

[0049] According to one aspect of the opposed-piston disc brake device of the present invention, the brake pad clip can be arranged without interfering with other elements, and the brake pad clip can exert a sufficient axial pressure force on the brake pad to separate the brake pad from the rotor. Brief description of the drawings Fig. Figure 1 is a front view showing a disc brake device according to a first embodiment. Fig. Figure 2 is a top view showing the disc brake device according to the first embodiment. Fig. Figure 3 is a side view of the disc brake device according to the first embodiment, seen from a screw-in side. Fig. Figure 4 is a view from below showing the disc brake device according to the first embodiment. Fig. Figure 5 is a perspective view of the disc brake device according to the first embodiment, seen from a radial outside and the insertion side. Fig. Figure 6 is a perspective view of the disc brake device according to the first embodiment, seen from a radial inside and a turning side. Fig. Figure 7 is a cross-sectional view of line AA in Fig. 2. Fig. 8 is a partially enlarged view of Fig. 7. Fig. Figure 9 is a schematic cross-sectional view of line BB in Fig. 8. Fig. Figure 10 is a diagram showing an inner brake pad and a brake pad clip made of Fig. 7 are omitted. (A) of Fig. Figure 11 is a perspective view of a guide wall section provided on the turning side of an inner body for the first embodiment when viewed from the circumferential inside, and (B) of Fig. Figure 11 is a perspective view showing a state in which the brake pad clip is in the guide concave groove of the guide wall section of (A) of Fig. 11 is mounted. Fig. Figure 12 is a front view showing the inner brake pad that has been removed from the disc brake device according to the first embodiment. Fig. Figure 13 is a front view showing the inner brake pad and brake pad clip that have been removed from the disc brake assembly according to the first embodiment. Fig. Figure 14 is a cross-sectional view along line CC in Fig. 13. Fig. 15 is a view showing the brake pad clips arranged on an axial inner side and the screw-out side and removed from the disc brake device according to the first embodiment, wherein (A) of Fig. 15 a front view, (B) of Fig. 15 a top view, (C) of Fig. 15 a view from below, (D) of Fig. 15 a right side view and (E) of Fig. 15 is a left side view. Fig. Figure 16 is a perspective view of the brake pad clips arranged on the axial inside and the turning side and removed from the disc brake device according to the first embodiment, seen from four directions on the axial outside. Fig. Figure 17 is a perspective view of the brake pad clips arranged on the axial inside and the turning side and removed from the disc brake device according to the first embodiment, seen from four directions on the axial inside. Fig. 18 is a view accordingly Fig. 11, which shows a second embodiment. Fig. Figure 19 is a perspective view of the guide wall section and the brake pad clip from (B) Fig. 18 for the second embodiment, seen from the radial inside. Fig. 20 is a view accordingly Fig. 11, which shows a third embodiment. Fig. 21 is a view accordingly Fig. 11, which shows a fourth embodiment. Fig. Figure 22 is a schematic view of a part of the guide wall section provided on the turning side of the inner body for the fourth embodiment, seen from the axial outside. (A) in Fig. 23 is a perspective view showing a state in which the brake pad clip is mounted in the guide concave groove of the guide wall section provided on the turned-out side of the inner body, for a fifth embodiment, and (B) in Fig. Figure 23 is a perspective view showing a state in which an insertion section of the inner brake pad is in the guide concave groove of (A) of Fig. 23 intervenes. Description of embodiments [First embodiment]

[0050] A first embodiment is described with reference to Fig. 1 to 17 described.

[0051] The opposed-piston disc brake device 1 of this example is a hybrid disc brake device in which a hydraulic opposed-piston brake mechanism section 2, which functions as a service brake, is combined with an electric floating brake mechanism section 3, which functions as a parking brake. However, the present invention is also applicable to opposed-piston disc brake devices that are generally known in the art and do not include a floating brake mechanism section.

[0052] The following describes the overall structure of the disc brake device 1 of this example, followed by a detailed description of the brake pad clip 7 and the structure surrounding it.

[0053] In this description and the claims, unless otherwise specified, the axial direction, circumferential direction and radial direction refer to the axial direction, circumferential direction and radial direction of a disk-shaped rotor 4 (see Fig. 2), which rotates together with the wheel. Additionally, the axial inside refers to the center side in the width direction of the vehicle in a state mounted on the vehicle, and the axial outside refers to the outside side in the width direction of the vehicle in a state mounted on the vehicle. Furthermore, the circumferential inside refers to the circumferential center of the disc brake assembly 1, and the circumferential outside refers to both circumferential sides of the disc brake assembly 1. In addition, the inward rotation side refers to the side on the circumferential outside where the rotor 4 enters the inside of the brake caliper 5 as the vehicle moves forward, and the outward rotation side refers to the side on the circumferential outside where the rotor 4 exits to the outside of the brake caliper 5 as the vehicle moves forward. [Overall structure of a disc brake device]

[0054] The disc brake assembly 1 comprises a brake caliper 5, a pair of brake pads 6a and 6b and four brake pad clips 7.

[0055] The disc brake device 1 of this example further comprises a plurality of pistons 8 and 9 (four in the illustrated example), a clamping element 10 and an electric actuator 11.

[0056] The brake caliper 5 is made of an aluminum or iron alloy and has an overall boat-like shape. The brake caliper 5 forms the opposed-piston brake mechanism section 2 and is attached to a suspension device such as a steering knuckle. The brake caliper 5 has a plurality of cylinders 12 (four in the example shown).

[0057] In particular, the brake caliper 5 has an inner body 13, which is arranged on the axial inside of the rotor 4, and an outer body 14, which is arranged on the axial outside of the rotor 4, each having two cylinders 12. The two cylinders 12 provided in the inner body 13 and the two cylinders 12 provided in the outer body 14 are arranged coaxially with each other. The inner body 13 and the outer body 14 are connected to each other by a plurality of connecting sections 15a, 15b and 15c (three in the illustrated example) extending in the axial direction.

[0058] The pistons 8 and 9 are mounted in each of the cylinders 12 such that they are axially displaceable. Of the four cylinders 12 provided in the brake caliper 5, three cylinders 12 are equipped with service-only pistons 8, which are actuated only during braking by the service brake, and the remaining cylinder 12 is equipped with a dual-purpose piston 9, which is actuated both during braking by the service brake and by the parking brake. The dual-purpose piston 9 is installed in the cylinder 12 located below the four cylinders 12 on the axial inner side and the rotational input side.

[0059] The pair of brake pads 6a and 6b is arranged on both axial sides of the rotor 4 and mounted such that it is movable in the axial direction with respect to the brake caliper 5. In particular, the inner brake pad 6a, which is arranged on the axial inside of the rotor 4, is mounted such that it is movable in the axial direction with respect to the inner body 13. An outer brake pad 6b, which is arranged on the axial outside of the rotor 4, is mounted such that it is movable in the axial direction relative to the outer body 14.

[0060] The brake pad clips 7 consist of a metal plate and are each arranged in a section between the end sections on both outer circumferences of the inner brake pad 6a and the inner body 13, and in a section between the end sections on both outer circumferences of the outer brake pad 6b and the outer body 14. The brake pad clip 7 serves to hold the inner brake pad 6a and the outer brake pad 6b respectively, to prevent the inner brake pad 6a and the outer brake pad 6b from sticking to the brake caliper 5, and to ensure smooth axial movement of the inner brake pad 6a and the outer brake pad 6b.

[0061] The clamping element 10 forms the floating brake mechanism section 3 and is mounted such that it is axially movable with respect to the brake caliper 5 in order to span the pair of brake pads 6a and 6b from the radial outer side. The clamping element 10 has a claw section 16 at its end section on the axial outer side. The claw section 16 is located between the axial outer surface of the outer brake pad 6b and the axial inner surface of the outer body 14 of the brake caliper 5 and presses the outer brake pad 6b towards the axial inner side during the braking process by the parking brake.

[0062] The electric actuator 11 comprises: an electric drive unit (MGU) 17 attached to the axial inside of the clamping element 10; and a rotary-to-linear conversion mechanism (not shown) driven by the electric drive unit 17, which converts rotary motion into linear motion.

[0063] The disc brake device 1 of this example generates a braking force through the service brakes by supplying brake fluid, which is a hydraulic fluid, to all cylinders 12 provided in the brake caliper 5. In particular, brake fluid is supplied to all cylinders 12 to push all pistons 8 and 9 out of the cylinders 12. The rotor 4 is clamped from both axial sides by the pair of brake pads 6a and 6b, thereby achieving a braking force through the service brake.

[0064] Furthermore, the disc brake device 1 of this example receives a braking force from the parking brake by driving the electric actuator 11. Specifically, the rotary-linear conversion mechanism is driven by the electric drive unit 17 to push the dual-purpose piston 9 out of the cylinder 12 and press the inner brake pad 6a against the axial inner surface of the rotor 4. Additionally, the reaction force generated by this pressing causes the clamping element 10 to be displaced axially inward with respect to the brake caliper 5, and the claw sections 16 press the outer brake pad 6b against the axial outer surface of the rotor 4. This clamps the rotor 4 from both axial sides by the pair of brake pads 6a and 6b, and a braking force is generated by the parking brake.

[0065] In the disc brake device 1 of this example, when the braking forces of the service brake and the parking brake are released, the brake pad clip 7 separates the inner brake pad 6a and the outer brake pad 6b axially from the rotor 4. Specifically, the inner brake pad 6a is pressed towards the axial inward direction by two brake pad clips 7 arranged on the axial inner side, and the inner brake pad 6a is separated from the rotor 4. Additionally, the outer brake pad 6b is pressed towards the axial outward direction by two brake pad clips 7 arranged on the axial outer side, and the outer brake pad 6b is separated from the rotor 4.

[0066] Next, the brake pad clip 7 of this example and the structure surrounding it will be described in detail.

[0067] As described above, the brake pad clips 7 are each arranged in a section between the end sections on both outer circumferences of the inner brake pad 6a and the inner body 13, and in a section between the end sections on both outer circumferences of the outer brake pad 6b and the outer body 14. Therefore, the structures of the inner body 13 and the outer body 14, as well as the structures of the inner brake pad 6a and the outer brake pad 6b, are described in detail as surrounding structures of the brake pad clip 7. [Inner body and outer body]

[0068] The inner body 13 has guide wall sections 19a on parts that adjoin both outer circumferential surfaces of the inner brake lining 6a. The guide wall sections 19a are provided on both outer circumferential surfaces of the axial outer surface of the inner body 13.

[0069] The outer body 14 has guide wall sections 19b on each of the parts adjacent to the two outer circumferential surfaces of the outer brake lining 6b. The guide wall sections 19b are provided on both outer circumferential surfaces of the axial inner surface of the outer body 14.

[0070] The guide wall sections 19a and 19b each have a circumferential side surface 20 facing the inner brake pad 6a or the outer brake pad 6b in the circumferential direction, and an axial side surface 21 facing the rotor 4 in the axial direction. In particular, the guide wall section 19a provided on the inner body 13 has a circumferential side surface 20 facing the inner brake pad 6a in the circumferential direction and an axial side surface 21 facing the axial inner surface of the rotor 4 in the axial direction. In contrast, the guide wall section 19b provided on the outer body 14 has the circumferential side surface 20 facing the outer brake pad 6b in the circumferential direction and the axial side surface 21 facing the axial outer surface of the rotor 4 in the axial direction.

[0071] Each of the circumferential surfaces 20 and the axial surfaces 21 is flat. The circumferential surface 20 and the axial surface 21 are arranged approximately at right angles to each other.

[0072] The guide wall sections 19a and 19b have a guide concave groove 22 that extends circumferentially along a radial intermediate section. The guide concave groove 22 is formed using a cutting tool, such as a milling cutter. The guide concave groove 22 is a rectangular groove with a rectangular cross-section perpendicular to the axial side surface 21 and has a circumferential opening section 23 that opens into the circumferential side surface 20 of the guide wall sections 19a and 19b, and an axial opening section 24 that opens into the axial side surface 21 of the guide wall sections 19a and 19b. The guide concave grooves 22 are designed to support axially movable mounting sections 32 (which will be described later) provided on the inner brake lining 6a and the outer brake lining 6b.

[0073] The radial groove width of the guide concave groove 22 is essentially constant in the circumferential direction. Furthermore, the axial groove depth of the guide concave groove 22 is essentially constant in the circumferential direction.

[0074] The guide concave groove 22 has a flat outer circumferential wall surface 25 facing the radial inner side and a flat inner circumferential wall surface 26 facing the radial outer side. The outer circumferential wall surface 25 and the inner circumferential wall surface 26 are arranged substantially parallel to each other. Furthermore, the guide concave groove 22 has a flat axial bottom surface 27.

[0075] The guide wall sections 19a and 19b are equipped with an external radial groove 28 (see (A) in Fig. 11) provided, which extends in a radial direction on a radial outer side part of the circumferential opening section 23 of the guide concave groove 22 on the circumferential side surface 20.

[0076] The outer radial groove 28 extends linearly in the radial direction, and its axial position does not change regardless of the radial position. The groove width in the axial direction of the outer radial groove 28 is essentially constant in the radial direction and is approximately 1 / 8 or more and 1 / 3 or less of the axial width of the circumferential side surface 20. Furthermore, the groove depth in the circumferential direction of the outer radial groove 28 is essentially constant in the radial direction. The outer radial grooves 28 open both towards the radial inner side and the circumferential inner side. The circumferential groove depth of the outer radial groove can vary depending on the radial position. Additionally, the outer radial groove can also be open only towards the circumferential inner side.

[0077] The inner circumferential wall surface 26 of the guide concave groove 22 is equipped with an inner circumferential groove 29 (see (A) in Fig. 11) provided, extending in the circumferential direction.

[0078] The inner circumferential groove 29 extends linearly in the circumferential direction, and its axial position does not change regardless of the circumferential position. The groove width in the axial direction of the inner circumferential groove 29 is essentially constant in the circumferential direction and is approximately 1 / 8 or more and 1 / 3 or less of the axial width of the inner circumferential wall surface 26. Furthermore, the groove width in the axial direction of the inner circumferential groove 29 is essentially equal to the groove width in the axial direction of the outer radial groove 28. The groove depth in the radial direction of the inner circumferential groove 29 is also essentially constant in the circumferential direction. The inner circumferential grooves 29 open both towards the radial outer side and the circumferential inner side. The groove depth in the radial direction of the inner circumferential groove can vary depending on the circumferential position. In addition, the inner circumferential groove can be open only towards the radial outer side.

[0079] In this example, the radial inner part of the circumferential opening section 23 of the guide concave groove 22 on the circumferential side surface 20 of the guide wall sections 19a and 19b acts as a torque receiving surface, which absorbs the torque acting on the inner brake pad 6a and the outer brake pad 6b during the braking process. [Inner brake pad and outer brake pad]

[0080] The inner brake pad 6a is arranged axially between the rotor 4 and the inner body 13. The outer brake pad 6b is arranged axially between the rotor 4 and the outer body 14. The inner brake pad 6a and the outer brake pad 6b each comprise a lining layer 30 and a metal pressure plate 31, which supports the back side of the lining layer 30.

[0081] The pressure plate 31 comprises attachment sections 32 on the radial intermediate sections of the end sections on both circumferential sides, each of which projects towards the outer circumferential side of the coating layer 30.

[0082] The extension section 32 is essentially rectangular and plate-shaped. The radial width of the extension section 32 is slightly smaller than the groove width in the radial direction of the guide concave groove 22. Furthermore, the axial thickness (plate thickness) of the extension section 32 is smaller than the groove depth in the axial direction of the guide concave groove 22.

[0083] The inner brake pad 6a has a pair of projection sections 32 provided at the end sections on both outer circumferences and engaging with a pair of guide concave grooves 22 provided in the inner body 13 to allow axial movement. Similarly, the outer brake pad 6b has a pair of projection sections 32 provided at the end sections on both outer circumferences and engaging with a pair of guide concave grooves 22 provided in the outer body 14 to allow axial movement. This allows the inner brake pad 6a and the outer brake pad 6b to be mounted relative to the brake caliper 5 in such a way that they are axially displaceable, but not circumferentially or radially displaceable.

[0084] The pressure plate 31 has torque transmission sections 33 on the radial inner sides of the end sections on both outer circumferential surfaces, each projecting towards the outer circumferential surfaces of the coating layer 30. The end surface on the outer circumferential surface of the torque transmission section 33 is flat and is positioned on the inner circumferential surface of the end surface on the outer circumferential surface of the extension section 32.

[0085] A leveling plate 54 is attached to the back of the printing plate 31 to cover the back of the printing plate 31. [Brake pad clip]

[0086] As described above, the disc brake device 1 of this example uses four brake pad clips 7, and the two brake pad clips 7 located on the axial inside of the rotor 4 have symmetrical shapes in the circumferential direction, while the two brake pad clips 7 located on the axial outside of the rotor 4 have symmetrical shapes in the circumferential direction. Additionally, the two brake pad clips 7 located on the threaded side have symmetrical shapes in the axial direction, and the two brake pad clips 7 located on the threaded side have symmetrical shapes in the axial direction.In this way, the shapes of the four brake pad clips 7 are symmetrical to each other in at least one of the axial and circumferential directions, and thus the detailed description of the brake pad clips 7 is given only for the brake pad clips 7 that are arranged on the axial inside and the turning side, and the description of the remaining brake pad clips 7 is omitted.

[0087] The brake pad clip 7 comprises a base section 34, an elastic section 35 and a pressure section 36. The brake pad clip 7 is manufactured by pressing a metal plate with elasticity and corrosion resistance, such as a stainless steel plate, and has a constant overall plate thickness.

[0088] The base section 34 has a substantially rectangular C-shape when viewed axially and is provided on the inner circumferential half-section of the radial intermediate section of the brake pad clip 7. The base section 34 is inserted into the guide concave groove 22 to surround the extension section 32 of the inner brake pad 6a. The base section 34 holds the extension sections 32 of the inner brake pad 6a and ensures smooth axial movement of the inner brake pad 6a with respect to the brake caliper 5.

[0089] The base section 34 comprises: an outer circumferential side plate section 37, which is arranged along the outer circumferential wall surface 25 of the guide concave groove 22; an inner circumferential side plate section 38, which is arranged along the inner circumferential wall surface 26 of the guide concave groove 22; and a connecting plate section 39, which connects the end sections on the outer circumferential sides in each of the outer circumferential side plate sections 37 and the inner circumferential side plate sections 38.

[0090] The base section 34 is inserted into the inside of the guide concave groove 22 without rattling by elastically pressing the outer circumferential side plate section 37 against the outer circumferential wall surface 25 and the inner circumferential side plate section 38 against the inner circumferential wall surface 26.

[0091] The outer circumferential side plate section 37 has a flat plate shape and an axial width that is essentially the same as that of the outer circumferential wall surface 25.

[0092] The inner circumferential side plate section 38 has a flat plate shape and an axial width that essentially corresponds to that of the inner circumferential wall surface 26. The circumferential length of the inner circumferential side plate section 38 is equal to the circumferential length of the outer circumferential side plate section 37. The inner circumferential side plate section 38 is arranged essentially parallel to the outer circumferential side plate section 37.

[0093] In this example, the inner circumferential side plate section 38 has a tongue-shaped claw section 40. The claw section 40 is formed by creating a substantially rectangular C-shaped slot on the circumferential center section of the inner circumferential side plate section 38 and bending the inner portion of the slot on the radial inner side. The claw section 40 extends toward the radial inner side as it moves toward the axial outer side. In a state where the base section 34 is fitted into the inner side of the guide concave groove 22, the claw section 40 engages axially with the inner circumferential groove 29 provided on the inner circumferential wall surface 26. Accordingly, the inner circumferential side plate section 38 is prevented from being displaced relative to the axial outer side with respect to the inner circumferential wall surface 26.

[0094] The connecting plate section 39 has a flat plate shape. The end section on the radial outside of the connecting plate section 39 is connected approximately at right angles to the end section on the outer circumferential side of the outer circumferential side plate section 37, and the end section on the radial inside of the connecting plate section 39 is connected approximately at right angles to the end section on the outer circumferential side of the inner circumferential side plate section 38.

[0095] The connecting plate section 39 comprises: a rotor-side notch 41, corresponding to the notch on the end section on the axial outside as described in the claims, which is positioned on the side closer to the rotor 4 in the axial direction; and a counter-rotor-side notch 42 on the end section on the axial inside, which is positioned on the side further away from the rotor 4 in the axial direction. The rotor-side notch 41 and the counter-rotor-side notch 42 are formed in a region extending from the end section on the radial inside to the end section on the radial outside in the connecting plate section 39. The radial length of the rotor-side notch 41 is greater than the radial width of the pressure section 36.

[0096] By forming the rotor-side notch 41 and the counter-rotor-side notch 42 in the connecting plate section 39, the axial width of the connecting plate section 39 is smaller than the axial width of each of the outer circumferential side plate sections 37 and the inner circumferential side plate sections 38, and is approximately 1 / 3 or more and 2 / 3 or less of the axial width of each of the outer circumferential side plate sections 37 and the inner circumferential side plate sections 38. In the example shown, the axial width of the rotor-side notch 41 is larger than the axial width of the counter-rotor-side notch 42, but the notches can be of the same size.

[0097] The elastic section 35 is elastically deformed by the inner brake pad 6a during braking by the service brake and the parking brake and stores elastic energy, which is used to separate the inner brake pad 6a from the rotor 4.

[0098] The elastic section 35 is provided in the outer circumferential half-section of the radial intermediate section of the brake pad clip 7 and is arranged on the outer circumferential side of the base section 34 in the guide concave groove 22 in a state in which the brake pad clip 7 is mounted. That is, in this example, the brake pad clip 7 contains not only the base section 34, which holds the attachment sections 32, but also the elastic section 35, which stores elastic energy, in the guide concave groove 22.

[0099] In this example, the elastic section 35, viewed radially, has essentially a C-shape and is partially cylindrical (essentially semi-cylindrical). The elastic section 35 is configured with a circumferential extension section 35a, which extends from the end section on the axial inner side towards the circumferential outer side in the connecting plate section 39, which forms the base section 34, and a curved section 35b, which is curved in an arc shape from the end section on the circumferential outer side of the circumferential extension section 35a towards the axial outer side when moving towards the circumferential outer side, and which is then curved in an arc shape towards the circumferential inner side when moving towards the axial outer side.However, the shape of the elastic section is not limited to the shape mentioned above and can be essentially J-shaped, essentially V-shaped, essentially M-shaped or the like when viewed in the radial direction.

[0100] The end section on the inner circumferential surface of the circumferential extension section 35a, which forms the end section on one side of the elastic section 35, is connected to the end section on the axial inner surface of the connecting plate section 39. The end sections on the inner circumferential surface of the circumferential extension section 35a are positioned on the axial outer surfaces of the end sections on the axial inner surfaces of each of the outer circumferential side plate sections 37 and the inner circumferential side plate sections 38 that form the base section 34. Therefore, in a state where the end sections on the axial inner surfaces of each of the outer circumferential side plate sections 37 and the inner circumferential side plate sections 38 that form the base section 34 abut the axial bottom surface 27 of the guide concave groove 22, a gap is formed between the axial inner surface of the circumferential extension section 35a and the axial bottom surface 27.In this example, tongue-shaped contact elements 53a and 53b, which are provided on the circumferential center sections of the end sections on the axial inner surfaces of each of the outer circumferential side plate sections 37 and the inner circumferential side plate sections 38, rest against the axial bottom surface 27 of the guide concave groove 22, but the contact elements can be omitted.

[0101] The end section on the inner circumferential side of the curved section 35b, which forms the end section on the other side of the elastic section 35, is connected to the end section on the outer circumferential side of the pressure section 36. The end section on the inner circumferential side of the curved section 35b is located on the axial outer side of the connecting plate section 39.

[0102] The pressure section 36 extends from the end section on the other side of the elastic section 35 towards the inner circumference. In this example, when the brake pad clip 7 (elastic section 35) is in a free state, the pressure section 36 is slightly inclined towards the axial inner surface as it moves towards the inner circumference. Therefore, when the brake pad clip 7 is in a free state, the pressure section 36 approaches the axial bottom surface 27 of the guide concave groove 22 as it moves towards the inner circumference.

[0103] In this example, the outer circumferential section of the pressure section 36 is located on the inner side of the rotor-side notch 41 provided in the connecting plate section 39. In other words, the pressure section 36 extends circumferentially through the rotor-side notch 41. Therefore, the majority of the pressure section 36 is located radially in the area between the outer circumferential side plate section 37 and the inner circumferential side plate section 38. The pressure section 36 presses the inner brake pad 6a towards the axial inner side, i.e., away from the rotor 4 in the axial direction, through the elastic force of the elastic section 35.

[0104] In this example, the axial inner side of the circumferential inner side of the pressure section 36 pushes the axial outer side of the attachment section 32 of the inner brake pad 6a towards the axial inner side.

[0105] The pressure section 36, viewed radially, has essentially an L-shape (including a J-shape) and comprises a curved section 43 on its axial inner side. In this example, the convex surface formed by the axial inner side of the curved section 43 is brought into contact with the axial outer side of the projection section 32 of the inner brake pad 6a, thereby pressing the projection section 32 towards the axial inner side.

[0106] A cut-out section 44 is formed in an area extending from a part near one of the elastic sections 35 to the inner circumferential part of the pressure section 36. The cut-out section 44 serves to relieve the stress acting on the elastic section 35 and the pressure section 36. In this example, the cut-out section 44 is formed by a slot (through hole) that extends in the width direction along the intermediate section between the elastic section 35 and the pressure section 36.

[0107] Neither the elastic section 35 nor the pressure section 36 protrudes from the axial opening section 24 of the guide concave groove 22 to the axial outside. In other words, the shape of the elastic section 35 changes when braking and when not braking, and the axial position of the pressure section 36 changes when braking and when not braking, but neither the elastic section 35 nor the pressure section 36 protrudes from the axial opening section 24 of the guide concave groove 22 to the axial outside, either when braking or not braking.

[0108] The brake pad clip 7 of this example further comprises an outwardly bent plate section 45 and an inwardly bent plate section 46.

[0109] The outwardly bent plate section 45 is bent at approximately a right angle to the radial outer side at the end section on the inner circumferential side of the outer circumferential side plate section 37, which forms the base section 34, and covers the radial outer outer portion of the circumferential opening section 23 on the circumferential side surface 20 of the guide wall section 19a. The axial width of the outwardly bent plate section 45 is smaller than the axial width of the outer circumferential side plate section 37 and is approximately 1 / 4 or more and 2 / 3 or less of the axial width of the outer circumferential side plate section 37. In this example, the outwardly bent plate section 45 is connected to the end section on the axial inner side of the outer circumferential side plate section 37.

[0110] The inwardly curved plate section 46 is bent at approximately a right angle to the inner circumferential side of the inner circumferential side plate section 38, which forms the base section 34, at the end face of the base section 34, and covers the radial inner part of the circumferential opening section 23 on the circumferential side surface 20 of the guide wall section 19a. The axial width of the inwardly curved plate section 46 is equal to the axial width of the inner circumferential side plate section 38.

[0111] In this example, the outwardly curved plate section 45 and the inwardly curved plate section 46 are essentially parallel to each other and arranged at the same circumferential position. That is, the outer circumferential surface of the outwardly curved plate section 45 and the outer circumferential surface of the inwardly curved plate section 46 are positioned on the same imaginary plane.

[0112] In this example, the outwardly curved plate section 45 has a tongue-shaped claw section 47. The claw section 47 extends from the end section on the radial outside of the outwardly curved plate section 45 toward the axial outside. The claw section 47 extends toward the circumferential outside as it moves toward the axial outside. The claw section 47 engages axially with the outer radial groove 28 provided on the circumferential side surface 20 in a state in which the base section 34 is fitted into the inside of the guide concave groove 22 and the outwardly curved plate section 45 covers the circumferential side surface 20 of the guide wall section 19a. Accordingly, the outwardly curved plate section 45 is prevented from being displaced toward the axial outside with respect to the circumferential side surface 20.

[0113] In this example, the inwardly curved plate section 46 has a pressure-receiving section 48 that absorbs the torque acting on the inner brake pad 6a during the braking process. The pressure-receiving section 48 covers a torque-receiving surface provided on the circumferential side surface 20 of the guide wall section 19a and is pressed against the circumferential end surface of the torque transmission section 33 of the inner brake pad 6a during the braking process.

[0114] In the brake pad clip 7 of this example with the configuration mentioned above, the curved section 43 provided on the pressure section 36 is always in contact with the axial outer surface of the attachment section 32 of the inner brake pad 6a or the axial inner surface of the attachment section 32 of the outer brake pad 6b.

[0115] In the brake pad clip 7 of this example, when the pistons 8 and 9 push the inner brake pad 6a and the outer brake pad 6b axially closer to the rotor 4 during braking by the service brake and the parking brake, the pressure section 36, which is in contact with the attachment section 32, is displaced axially closer to the rotor 4, and an elastic deformation occurs in the elastic section 35. In particular, the elastic section 35 is elastically deformed such that the distance in the axial direction between the end section on one side and the end section on the other side is increased. As a result, the elastic section 35 stores elastic energy.

[0116] In the brake pad clip 7 of this example, the elastic restoring force of the piston seal (not shown) pulls the pistons 8 and 9 back to the deep side of the cylinder 12 when the brake is released, and the elastic restoring force of the elastic section 35 pushes the inner brake pad 6a or the outer brake pad 6b axially across the pressure section 36 away from the rotor 4. This moves the inner brake pad 6a and the outer brake pad 6b into a position that prevents them from rubbing against the rotor 4.

[0117] According to the counter-piston disc brake device 1 described above in this example, the brake pad clip 7 can be arranged without obstructing other elements, and the brake pad clip 7 can exert a sufficient axial pressure force on the inner brake pad 6a and the outer brake pad 6b to separate the inner brake pad 6a and the outer brake pad 6b from the rotor 4.

[0118] This means that, according to the disc brake device 1 of this example, the elastic force of the elastic section 35, which forms the brake pad clip 7, can only press the inner brake pad 6a or the outer brake pad 6b in the axial direction away from the rotor 4 via the pressure section 36. Therefore, compared to the conventional structure described above, where component forces are used to exert pressure in the axial direction, a greater compressive force can be exerted on the inner brake pad 6a or the outer brake pad 6b in the axial direction.

[0119] In particular, in the disc brake device 1 of this example, when the parking brake force is released, the two brake pad clips 7 located on the axial outer side must move the clamping element 10 axially outwards relative to the brake caliper 5 when the outer brake pad 6b is moved axially outwards. For this reason, a large force is required to move the outer brake pad 6b to the axial outer side. However, according to the brake pad clip 7 of this example, a large axial compressive force can be exerted on the outer brake pad 6b, which sufficiently separates the outer brake pad 6b from the rotor 4, thus effectively preventing any rubbing between the outer brake pad 6b and the rotor 4.

[0120] Furthermore, in a state where the brake pad clip 7 is mounted, not only the base section 34, which holds the extension section 32, but also the elastic section 35 are located on the inside of the guide concave groove 22. Due to the extension of the pressure section 36 from the elastic section 35 towards the inner circumferential surface, the pressure section 36 is also located on the inside of the guide concave groove 22. As described above, both the elastic section 35 and the pressure section 36 are accommodated in the guide concave groove 22 for engagement with the extension section 32, and thus, despite a configuration in which the inner body 13 is located near the rear surface (axial inner side) of the inner brake pad 6a and the outer body 14 is located near the rear surface (axial outer side) of the outer brake pad 6b, the brake pad clip 7 can be positioned without interfering with other elements.

[0121] In addition, in this example the shapes and dimensions of the elastic section 35 and the pressure section 36 are regulated such that neither the elastic section 35 nor the pressure section 36 protrudes from the axial opening section 24 of the guide concave groove 22 on the axial outside, thus preventing the brake pad clip 7 from engaging with the rotor 4.

[0122] Since the elastic section 35 is also arranged on the outer circumferential surface of the base section 34 in the guide concave groove 22, the circumferential distance from the elastic section 35 to the attachment section 32 can be increased. Therefore, the stress caused by the elastic deformation of the elastic section 35 during braking can be suppressed. Accordingly, the brake pad clip 7 can prevent plastic deformation of the pad 30 from its new state to a worn state, so that a compressive force can be exerted stably on the inner brake pad 6a or the outer brake pad 6b.

[0123] Since in this example a part of the elastic section 35 and the pressure section 36 is also provided with the cut-out section 44 formed by a slot, the stress generated in the elastic section 35 and the pressure section 36 can be suppressed more effectively.

[0124] Furthermore, in this example, the claw section 47 provided on the outwardly curved plate section 45 engages axially with the outer radial groove 28, which is provided on the circumferential side surface 20 of the guide wall sections 19a and 19b, and the claw section 40 provided on the inner circumferential side plate section 38 engages axially with the inner circumferential groove 29, which is provided on the inner circumferential wall surface 26 of the guide concave groove 22. Therefore, it is prevented that the brake pad clip 7 tilts (rotates) due to a reaction force that arises when the pressure section 36 presses on the inner brake pad 6a or the outer brake pad 6b. Therefore, the position of the brake pad clip 7 can be stabilized, and a pressure force can be exerted stably on the inner brake pad 6a or the outer brake pad 6b.

[0125] Furthermore, in this example, when the brake is released, the curved section 43 of the pressure section 36 of the brake pad clip 7 can press against the axial side surface of the attachment section 32, thereby maintaining a constant contact position between the attachment section 32 and the pressure section 36. Therefore, it is possible to suppress variations in the direction and magnitude of the pressure force exerted on the inner brake pad 6a and the outer brake pad 6b.

[0126] Since in this example the guide concave groove 22 accommodates not only the base section 34, which holds the extension section 32, but also the elastic section 35, the circumferential dimension of the guide concave groove 22 is longer than if a brake pad clip without the elastic section 35 were used. This reduces the thickness of the end sections on the outer circumferential surfaces of the inner body 13 and the outer body 14. However, since the thickness of the end sections on the outer circumferential surfaces of the inner body 13 and the outer body 14 each has a sufficiently small influence on the stiffness and strength of the brake caliper 5, the strength and stiffness of the brake caliper 5 can still be adequately ensured even if the circumferential dimension of the guide concave groove 22 is extended to accommodate the elastic section 35. [Second embodiment]

[0127] A second embodiment is described with reference to the Fig. 18 and Fig. 19 described. In this example, components similar to those in the first embodiment are provided with the same reference numerals as in the first embodiment, and their detailed description is omitted.

[0128] In this example, only the structure of a brake pad clip 7a and the structure of the guide wall section 19a (19b) differ from the structure of the first embodiment.

[0129] In this example, instead of the radial groove 28 (see (A) in Fig. 11), which extends radially on the circumferential side surface 20 of the guide wall section 19a (19b), an outer circumferential groove 49 extending in the circumferential direction is provided on the outer circumferential wall surface 25 of the guide concave groove 22.

[0130] The outer circumferential groove 49 extends linearly in the circumferential direction, and its axial position does not change regardless of the circumferential position. The groove width in the axial direction of the outer circumferential groove 49 is essentially constant in the circumferential direction and is approximately 1 / 8 or more and 1 / 3 or less of the axial width of the outer circumferential wall surface 25. Additionally, the groove width in the axial direction and the axial position of the outer circumferential groove 49 are essentially equal to the groove width in the axial direction and the axial position of the inner circumferential groove 29. Furthermore, the groove depth in the radial direction of the outer circumferential groove 49 is essentially constant in the circumferential direction. The outer circumferential grooves 49 open both radially to the inner side and circumferentially to the inner side. The groove depth in the radial direction of the outer circumferential groove can vary depending on the circumferential position. Additionally, the outer circumferential groove can be open only radially to the inner side.

[0131] An outwardly curved plate section 45a of the brake pad clip 7a of this example does not include the claw section 47 (see (B) in Fig. 11) and is formed entirely in a flat plate shape. The axial width of the outwardly curved plate section 45a is equal to the axial width of the outer circumferential side plate section 37a.

[0132] The brake pad clip 7a of this example has a tongue-shaped claw section 50 on the outer circumferential side plate section 37a. The claw section 50 is formed by creating a substantially rectangular C-shaped slot on the circumferential center section of the outer circumferential side plate section 37a and bending the inner portion of the slot on the radial outer side. The claw sections 50 extend toward the radial outer side as they move toward the axial outer side. In a state where the base section 34 is fitted into the inner side of the guide concave groove 22, the claw section 50 engages axially with the outer circumferential groove 49 provided on the outer circumferential wall surface 25. Accordingly, displacement of the outer circumferential side plate section 37a relative to the axial outer side with respect to the outer circumferential wall surface 25 is prevented.

[0133] In the example described above, the claw section 50 provided on the outer circumferential side plate section 37a engages axially with the outer circumferential groove 49, which is provided on the outer circumferential wall surface 25 of the guide concave groove 22, and the claw section 40 provided on the inner circumferential side plate section 38 engages axially with the inner circumferential groove 29, which is provided on the inner circumferential wall surface 26 of the guide concave groove 22. This prevents the brake pad clip 7a from tilting due to a reaction force that arises when the pressure section 36 presses on the inner brake pad 6a or the outer brake pad 6b. This stabilizes the position of the brake pad clip 7a and allows a pressure force to be applied stably to the inner brake pad 6a or the outer brake pad 6b.

[0134] Furthermore, the outer circumferential groove 49 and the inner circumferential groove 29 can also be machined simultaneously by cutting, which is advantageous in terms of reducing machining costs.

[0135] The other configurations and effects are the same as in the first embodiment. [Third embodiment]

[0136] A third embodiment is described with reference to Fig. 20 described. In this example, components similar to those in the first embodiment are provided with the same reference numerals as in the first embodiment, and their detailed description is omitted.

[0137] In this example, only the structure of a brake pad clip 7b and the structure of the guide wall section 19a (19b) differ from the structure of the first embodiment.

[0138] In this example, instead of an inner circumferential groove 29 (see (A) in Fig. 11) on the inner circumferential wall surface 26 of the guide concave groove 22 of the guide wall section 19a (19b) on the radial inside of the circumferential opening section 23 of the guide concave groove 22 on the circumferential side surface 20 an inner radial groove 51 extending in the radial direction is provided.

[0139] The inner radial groove 51 extends linearly in the radial direction, and its axial position does not change independently of the radial position. The groove width in the axial direction of the inner radial groove 51 is essentially constant in the radial direction and is approximately 1 / 8 or more and 1 / 3 or less of the axial width of the circumferential side surface 20. Additionally, the groove width in the axial direction and the axial position of the inner radial groove 51 are essentially equal to the groove width in the axial direction and the axial position of the outer radial groove 28. Furthermore, the groove depth in the circumferential direction of the inner radial groove 51 is essentially constant in the radial direction. The inner radial grooves 51 open both to the radial outer side and to the circumferential inner side. The groove depth in the circumferential direction of the inner radial groove can vary depending on the radial position. Furthermore, the inner radial groove can also be open only to the circumferential inner side.

[0140] An inner circumferential side plate section 38a of the brake pad clip 7b of this example does not include the claw section 40 (see (B) in Fig. 11) and is designed as a flat plate overall.

[0141] The brake pad clip 7b of this example has a tongue-shaped claw section 52 on an inwardly curved plate section 46a. The claw section 52 extends from the end section on the radial inner side of the inwardly curved plate section 46a toward the axial outer side. The claw section 52 extends toward the circumferential outer side as it moves in the axial outer direction. The claw section 52 engages axially with the inner radial groove 51 on the circumferential side surface 20 in a state in which the base section 34 is fitted into the inner side of the guide concave groove 22 and the inwardly curved plate section 46a covers the circumferential side surface 20 of the guide wall section 19a. Accordingly, the inwardly curved plate section 46a is prevented from being displaced toward the axial outer side with respect to the circumferential side surface 20.The inwardly curved plate section 46a has the claw section 52, but no flat pressure-receiving section 48 (see (A) in . Fig. 23).

[0142] In the example described above, the claw section 47 provided on the outwardly curved plate section 45 engages axially with the outer radial groove 28, which is provided on the circumferential side surface 20 of the guide wall sections 19a and 19b, and the claw section 52 provided on the inwardly curved plate section 46a engages axially with the inner radial groove 51, which is provided on the circumferential side surface 20. This prevents the brake pad clip 7b from tilting due to the reaction force generated when the pressure section 36 presses the inner brake pad 6a or the outer brake pad 6b. Therefore, the position of the brake pad clip 7b can be stabilized, and a pressure force can be exerted stably on the inner brake pad 6a or the outer brake pad 6b.

[0143] In addition, the outer radial groove 28 and the inner radial groove 51 can be machined by linearly moving a cutting tool in the radial direction, which is advantageous in order to reduce the number of machining steps.

[0144] The other configurations and effects are the same as those of the first embodiment. [Fourth example]

[0145] A fourth embodiment is described with reference to the Fig. 21 and Fig. 22 described. In this example, components similar to those in the first embodiment are given the same reference numerals as in the first embodiment, and their detailed description is omitted.

[0146] This example is a modification of the third embodiment. In this example, the groove bottom surfaces of an outer radial groove 28a and an inner radial groove 51a, which are provided on the circumferential side surface 20 of the guide wall section 19a (19b), are each designed as partial cylindrical surfaces. Furthermore, the groove bottom surfaces of the outer radial groove 28a and the inner radial groove 51a are arranged on the same imaginary cylindrical surface C.

[0147] In the example described above, the outer radial groove 28a and the inner radial groove 51a can be machined simultaneously by milling or the like, thereby reducing the number of machining steps and machining costs.

[0148] The other configurations and effects are the same as those of the first and third embodiments. [Fifth example]

[0149] A fifth embodiment is described with reference to Fig. 23 described. In this example, components similar to those in the first embodiment are provided with the same reference numerals as in the first embodiment, and their detailed description is omitted.

[0150] This example is a modification of the third embodiment. A brake pad clip 7c of this example is provided with the pressure-receiving section 48 and a tongue-shaped claw section 52 on an inwardly curved plate section 46b.

[0151] The claw section 52 is provided on the radial outer part of the inwardly curved plate section 46b and extends toward the outer circumferential surface as it moves toward the axial outer surface. The pressure-receiving section 48 is provided on the radial inner part of the inwardly curved plate section 46b.

[0152] In the example described above, the inwardly curved plate section 46b of the brake pad clip 7c is provided with the pressure-absorbing section 48, enabling the pressure-absorbing section 48 to protect the circumferential side surface 20 of the guide wall section 19a.

[0153] The other configurations and effects are the same as those of the first and third embodiments.

[0154] Although the exemplary embodiment of the present invention has been described above, the present invention is not limited to this embodiment and can be modified accordingly without deviating from the technical concept of the invention. Furthermore, the structures of each exemplary embodiment can be combined accordingly, provided no contradictions arise.

[0155] In the implementation of the present invention, the shapes of the elastic section, the claw section, and the like, which form the brake pad clip, are not limited to the structures of the exemplary embodiments and can be modified accordingly. Furthermore, the overall length, depth, and formation positions of the outer radial groove, the inner radial groove, the outer circumferential groove, and the inner circumferential groove are not limited to the structures of the individual exemplary embodiments and can be modified accordingly.

[0156] Here, the features of the exemplary embodiment of the brake caliper for the opposed-piston disc brake according to the present invention, which has been described above, are briefly summarized and listed below. [1] Counter-piston disc brake device (1), comprising: a brake caliper (5) with two or more cylinders (12) configured to be mounted on a suspension device; a brake pad (6a, 6b) which is mounted in such a way that it is movable in the axial direction with respect to the brake caliper (5); and a brake pad clip (7) made of a metal plate, which is arranged between the brake caliper (5) and the brake pad (6a, 6b), wherein the brake caliper (5) comprises a guide wall section (19a, 19b) on a part adjacent to a circumferential outer surface of the brake pad (6a, 6b), wherein the guide wall section has a circumferential side surface (20) which faces the brake pad (6a, 6b) in a circumferential direction and an axial side surface (21) which faces a rotor (4) in the axial direction, the guide wall section (19a, 19b) comprises a guide concave groove (22) extending in the circumferential direction and having a circumferential opening section (23) opening at the circumferential side surface (20) and an axial opening section (24) opening at the axial side surface (21), the brake pad (6a, 6b) comprises a projection section (32) configured to engage in the axial direction with the guide concave groove (22) in order to be movable, and The brake pad clip (7) has a substantially rectangular C-shape when viewed in the axial direction and comprises a base section (34) which is inserted into the guide concave groove (22) to surround the attachment section (32), an elastic section (35) which has an end section on one side which is connected to the base section (34) and which is arranged on the outer circumferential side of the base section (34) in the guide concave groove (22), and a pressure section (36) which extends from an end section on the other side of the elastic section (35) to an inner circumferential side and is designed to push the brake pad (6a, 6b) away from the rotor (4) by means of an elastic force of the elastic section (35) in the axial direction. [2] Counter-piston disc brake device (1) according to the foregoing [1], wherein the elastic section (35) is formed in a partially cylindrical shape, which is essentially C-shaped when viewed in the radial direction. [3] Counter-piston disc brake device (1) according to the foregoing [1], wherein the base section (34) comprises an outer circumferential side plate section (37) arranged along an outer circumferential wall surface (25) facing a radial inside in the guide concave groove (22), an inner circumferential side plate section (38) arranged along an inner circumferential wall surface (26) facing a radial outside in the guide concave groove (22), and a connecting plate section (39) connecting end sections on the outer circumferential surfaces of each of the outer circumferential side plate sections (37) and the inner circumferential side plate section (38), and the end section on one side of the elastic section (35) is connected to an end section on a side which is further away from the rotor (4) in the axial direction in the connecting plate section (39). [4] Counter-piston disc brake device (1) according to the foregoing [3], wherein The brake pad clip (7) further comprises an outwardly bent plate section (45) which is bent from the end section on the circumferential inner side of the outer circumferential side plate section (37) towards the radial outer side, and an inwardly bent plate section (46) which is bent from the end section on the circumferential inner side of the inner circumferential side plate section towards the radial inner side. [5] Counter-piston disc brake device (1) according to the foregoing [4], wherein an outer circumferential groove (49) extending in the circumferential direction is provided on the outer circumferential wall surface (25) of the guide concave groove (22) and a claw section (50) configured to engage with the outer circumferential groove (49) is provided on the outer circumferential side plate section (37), or an outer radial groove (28) extending in the radial direction is provided on a radial outer side part of the circumferential opening section (23) of the guide concave groove (22) on the circumferential side surface (20) of the guide wall section (19a, 19b), and a claw section (47) configured to engage with the outer radial groove (28) is provided on the outwardly bent plate section (45). [6] Counter-piston disc brake device (1) according to the foregoing [4], wherein an inner circumferential groove (29) extending in the circumferential direction is provided on the inner circumferential wall surface (26) of the guide concave groove (22) and a claw section (40) configured to engage with the inner circumferential groove (29) is provided on the inner circumferential side plate section (38), or an inner radial groove (51) extending in the radial direction is provided on a radial inner part of the circumferential opening section (23) of the guide concave groove (22) on the circumferential side surface (20) of the guide wall section (19a, 19b), and a claw section (52) configured to engage with the inner radial groove (51) is provided on the inwardly bent plate section (46). [7] Counter-piston disc brake device (1) according to the foregoing [4], wherein an outer radial groove (28) extending in the radial direction is provided on the radial outer side part of the circumferential opening section (23) of the guide concave groove (22) on the circumferential side surface (20) of the guide wall section (19a, 19b), and a claw section (47) configured to engage with the outer radial groove (28) is provided on the outwardly curved plate section (45), and an inner circumferential groove (29) extending in the circumferential direction is provided on the inner circumferential wall surface (26) of the guide concave groove (22), and a claw section (40) which is designed to engage with the inner circumferential groove (29) is provided on the inner circumferential side plate section (38). [8] Counter-piston disc brake device (1) according to the foregoing [4], wherein an outer radial groove (28a) extending in the radial direction is provided on the radial outer side part of the circumferential opening section (23) of the guide concave groove (22) on the circumferential side surface (20) of the guide wall section (19a, 19b), and a claw section (47) configured to engage with the outer radial groove (28a) is provided on the outwardly bent plate section (45), an inner radial groove (51a) extending radially is provided on the radial inner part of the circumferential opening section (23) of the guide concave groove (22) on the circumferential side surface (20) of the guide wall section (19a, 19b), and a claw section (52) configured to engage with the inner radial groove (51a) is provided on the inwardly curved plate section (46), and a groove bottom surface of the outer radial groove (28a) and a groove bottom surface of the inner radial groove (51a) are arranged on the same imaginary cylindrical surface. [9] Counter-piston disc brake device (1) according to the foregoing [3], wherein the connecting plate section (39) has a notch (rotor-side notch 41) at an end section on a side that is closer to the rotor (4) in the axial direction, and a part of the elastic section (35) or a part of the pressure section (36) is arranged on an inside of the notch.

[10] Counter-piston disc brake device (1) according to the foregoing [4], wherein at least one of the inwardly curved plate sections (46b) and the outwardly curved plate sections (45) has a pressure receiving section (48) which is designed to absorb a torque acting on the brake pad (6a, 6b) during the braking process.

[11] Counter-piston disc brake device (1) according to the foregoing [1], wherein each of the elastic sections (35) and the pressure sections (36) does not project in the axial direction from the axial opening section (24) of the guide concave groove (22) to one side of the rotor (4).

[12] Counter-piston disc brake device (1) according to the foregoing [1], wherein the elastic section (35) comprises a cut-out section (44).

[13] Counter-piston disc brake device (1) according to the foregoing [1], wherein the pressure section (36) is configured to press an axial side surface of the insertion section (32) of the brake pad (6a, 6b).

[0157] This application is based on a Japanese patent application (patent application no. 2022-206729) dated December 23, 2022, the contents of which are incorporated into this application by reference. Industrial applicability

[0158] According to the opposed-piston disc brake device of the present invention, it is possible to realize an opposed-piston disc brake device in which the brake pad clip can be arranged without affecting other elements and the brake pad clip can exert a sufficient axial pressure force on the brake pad to separate the brake pad from the rotor. Reference symbol list 1 disc brake device 2 Counter-piston brake mechanism section 3 floating brake mechanism section 4 Rotor 5 brake calipers 6a inner brake pad 6b outer brake pad 7, 7a, 7b, 7c Brake pad clip 8 operating pistons only 9 dual-purpose pistons 10 clamping elements 11 electric actuator 12 cylinders 13 inner bodies 14 Outer body 15a, 15b, 15c Connecting section 16 Claw section 17 electric drive unit 19a, 19b Guide wall section 20 Perimeter side area 21 axial side surface 22 Leading concave 23 Perimeter opening section 24 axial opening section 25 outer perimeter wall area 26 inner perimeter wall area 27 axial floor area 28, 28a outer radial groove 29 inner circumferential groove 30 layer of material 31 Printing plate 32 Approach Section 33 Torque transmission section 34 Basic section 35 elastic section 35a Scope section 35b curved section 36 Print section 37, 37a outer circumferential side plate section 38, 38a inner circumferential side plate section 39 Connecting plate section 40 Claw section 41 rotor-side notch 42 counter-rotor side notch 43 curved section 44 cut-out section 45, 45a outwardly curved plate section 46, 46a, 46b inwardly curved plate section 47 Claw section 48 Pressure absorption section 49 outer circumferential groove 50 claw section 51, 51a inner radial groove 52 Claw section 53a, 53b Attachment elements 54 leveling plate QUOTES INCLUDED IN THE DESCRIPTION

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

[0000] WO 2014 / 097098A1 [0007, 0008, 0009] JP 2016-28216A [0008, 0010] JP 2022-206729

[0157]

Claims

[1] Counter-piston disc brake device comprising: a brake caliper with two or more cylinders, configured to be mounted on a suspension device; a brake pad that is mounted in such a way that it is movable in the axial direction with respect to the brake caliper; and a brake pad clip made of a metal plate, which is positioned between the brake caliper and the brake pad, wherein the brake caliper comprises a guide wall section on a part adjacent to a circumferential outer surface of the brake pad, wherein the guide wall section has a circumferential side surface facing the brake pad in a circumferential direction and an axial side surface facing a rotor in the axial direction, the guide wall section comprises a guide concave groove extending circumferentially and has a circumferential opening section opening on the circumferential side surface and an axial opening section opening on the axial side surface. the brake pad includes a projection section configured to engage with the guide concave groove in the axial direction in order to be movable, and The brake pad clip, viewed in the axial direction, has an essentially rectangular C-shape and comprises a base section inserted into the guide concave groove to surround the attachment section, an elastic section having an end section on one side connected to the base section and located on the outer circumferential side of the base section in the guide concave groove, and a pressure section extending from an end section on the other side of the elastic section to an inner circumferential side and designed to push the brake pad away from the rotor by an elastic force of the elastic section in the axial direction. [2] Counter-piston disc brake device according to claim 1, wherein the elastic section is formed in a partially cylindrical shape which is substantially C-shaped when viewed radially. [3] Counter-piston disc brake device according to claim 1, wherein the base section comprises an outer circumferential side plate section arranged along an outer circumferential wall surface facing a radial inside in the guide concave groove, an inner circumferential side plate section arranged along an inner circumferential wall surface facing a radial outside in the guide concave groove, and a connecting plate section connecting end sections on the outer circumferential surfaces of each of the outer circumferential side plate sections and the inner circumferential side plate section, and the end section on one side of the elastic section is connected to an end section on a side that is further away from the rotor in the axial direction in the connecting plate section. [4] Counter-piston disc brake device according to claim 3, wherein the brake pad clip further comprises an outwardly bent plate section which is bent from the end section on the circumferential inner side of the outer circumferential side plate section towards the radial outer side, and an inwardly bent plate section which is bent from the end section on the circumferential inner side of the inner circumferential side plate section towards the radial inner side. [5] Counter-piston disc brake device according to claim 4, wherein an outer circumferential groove extending in the circumferential direction is provided on the outer circumferential wall surface of the guide concave groove and a claw section configured to engage with the outer circumferential groove is provided on the outer circumferential side plate section, or an outer radial groove extending in the radial direction is provided on a radial outer side portion of the circumferential opening section of the guide concave groove on the circumferential side surface of the guide wall section, and a claw section configured to engage with the outer radial groove is provided on the outwardly bent plate section. [6] Counter-piston disc brake device according to claim 4, wherein an inner circumferential groove extending in the circumferential direction is provided on the inner circumferential wall surface of the guide concave groove and a claw section configured to engage with the inner circumferential groove is provided on the inner circumferential side plate section, or an inner radial groove extending in the radial direction is provided on a radial inner part of the circumferential opening section of the guide concave groove on the circumferential side surface of the guide wall section, and a claw section configured to engage with the inner radial groove is provided on the inwardly bent plate section. [7] Counter-piston disc brake device according to claim 4, wherein an outer radial groove extending in the radial direction is provided on the radial outer side portion of the circumferential opening section of the guide concave groove on the circumferential side surface of the guide wall section, and a claw section configured to engage with the outer radial groove is provided on the outwardly curved plate section, and an inner circumferential groove extending in the circumferential direction is provided on the inner circumferential wall surface of the guide concave groove, and a claw section, which is designed to engage with the inner circumferential groove, is provided on the inner circumferential side plate section. [8] Counter-piston disc brake device according to claim 4, wherein an outer radial groove extending in the radial direction is provided on the radial outer side portion of the circumferential opening section of the guide concave groove on the circumferential side surface of the guide wall section, and a claw section configured to engage with the outer radial groove is provided on the outwardly curved plate section, an inner radial groove extending in the radial direction is provided on the radial inner part of the circumferential opening section of the guide concave groove on the circumferential side surface of the guide wall section, and a claw section configured to engage with the inner radial groove is provided on the inwardly curved plate section, and a groove bottom surface of the outer radial groove and a groove bottom surface of the inner radial groove are arranged on the same imaginary cylindrical surface. [9] Counter-piston disc brake device according to claim 3, wherein the connecting plate section has a notch (rotor-side notch) at an end section on a side that is closer to the rotor in the axial direction, and a part of the elastic section or a part of the pressure section is arranged on an inside of the indentation. [10] Counter-piston disc brake device according to claim 4, wherein at least one of the inwardly curved plate sections and the outwardly curved plate sections has a pressure receiving section designed to receive a torque acting on the brake pad during the braking process. [11] Counter-piston disc brake device according to claim 1, wherein each of the elastic sections and the pressure sections does not project from the axial opening section of the guide concave groove to one side of the rotor in the axial direction. [12] Counter-piston disc brake device according to claim 1, wherein the elastic section comprises a cut-out section. [13] Counter-piston disc brake device according to claim 1, wherein the pressure section is configured to press an axial side surface of the attachment section of the brake pad.

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