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JP-7856558-B2 - Opposed piston type disc brake system

JP7856558B2JP 7856558 B2JP7856558 B2JP 7856558B2JP-7856558-B2

Inventors

  • 柏崎 裕

Assignees

  • 曙ブレーキ工業株式会社

Dates

Publication Date
20260511
Application Date
20221223

Claims (13)

  1. A caliper having two or more cylinders and fixed to a suspension system, A pad supported so as to be axially movable relative to the caliper, The caliper and the pad are positioned together and include a metal plate pad clip, The caliper has a guide wall portion adjacent to the circumferentially outer side of the pad, which has a circumferential side facing the pad in the circumferential direction and an axial side facing the rotor in the axial direction, respectively. The guide wall portion has a guide groove that extends in the circumferential direction and has a circumferential opening on the circumferential side surface and an axial opening on the axial side surface, respectively. The pad has an ear portion that is axially movable and engaged with the guide groove, The pad clip has a substantially U-shape in an axial view and includes a base portion fitted into the guide groove so as to surround the lug portion, a resilient portion having one end connected to the base portion and positioned circumferentially outward from the base portion within the guide groove, and a pressing portion extending circumferentially inward from the other end of the resilient portion, which presses the pad away from the rotor in the axial direction by the elastic force of the resilient portion. Opposed piston type disc brake system.
  2. The aforementioned resilient portion is configured as a partially cylindrical shape that forms a substantially C-shape when viewed radially, as described in claim 1 of the opposing piston type disc brake device.
  3. The base portion comprises an outer peripheral plate portion disposed along the outer peripheral wall surface facing radially inward within the guide groove, an inner peripheral plate portion disposed along the inner peripheral wall surface facing radially outward within the guide groove, and a connecting plate portion connecting the outer peripheral plate portion and the inner peripheral plate portion, respectively, The end of the resilient portion on one side is connected to the end of the connecting plate portion that is furthest from the rotor in the axial direction. The opposed piston type disc brake device as described in claim 1.
  4. The pad clip further comprises an outward-bent plate portion that is bent radially outward from the circumferentially inner end of the outer peripheral plate portion, and an inward-bent plate portion that is bent radially inward from the circumferentially inner end of the inner peripheral plate portion. The opposed piston type disc brake device described in claim 3.
  5. The outer circumferential groove extending in the circumferential direction is provided on the outer circumferential wall surface of the guide groove, and the outer circumferential side plate portion is provided with a claw portion that engages with the outer circumferential groove, or the outer radial groove extending in the radial direction is provided on the circumferential side surface portion of the guide wall portion that is radially outward from the circumferential opening of the guide groove, and the outward bent plate portion is provided with a claw portion that engages with the outer radial groove. The opposed piston type disc brake device described in claim 4.
  6. The inner circumferential wall surface of the guide groove is provided with an inner circumferential groove extending in the circumferential direction, and the inner circumferential side plate portion is provided with a claw portion that engages with the inner circumferential groove, or the circumferential side surface portion of the guide wall portion is provided with an inner radial groove extending in the radial direction inward from the circumferential opening of the guide groove, and the inwardly bent plate portion is provided with a claw portion that engages with the inner radial groove. The opposed piston type disc brake device described in claim 4.
  7. A radially extending outer radial groove is provided on the circumferential side surface of the guide wall portion, in the portion radially outward from the circumferential opening of the guide groove, and a claw portion is provided on the outwardly bent plate portion that engages with the outer radial groove. The inner circumferential wall surface of the guide groove is provided with an inner circumferential groove extending in the circumferential direction, and the inner circumferential side plate portion is provided with a claw portion that engages with the inner circumferential groove. The opposed piston type disc brake device described in claim 4.
  8. A radially extending outer radial groove is provided on the circumferential side surface of the guide wall portion, in the portion radially outward from the circumferential opening of the guide groove, and a claw portion is provided on the outwardly bent plate portion that engages with the outer radial groove. A radially extending inner radial groove is provided on the circumferential side surface of the guide wall portion, in the portion radially inward from the circumferential opening of the guide groove, and a claw portion is provided on the inwardly bent plate portion that engages with the inner radial groove. The groove bottom surface of the outer radial groove and the groove bottom surface of the inner radial groove are located on the same virtual cylindrical surface. The opposed piston type disc brake device described in claim 4.
  9. The connecting plate portion has a notch at the end closest to the rotor in the axial direction. A part of the resilient portion or a part of the pressing portion is located inside the notch. The opposed piston type disc brake device described in claim 3.
  10. The opposed piston type disc brake device according to claim 4, wherein the inward-bent plate portion and/or the outward-bent plate portion has a pressure-receiving portion that receives torque acting on the pad during braking.
  11. The opposing piston type disc brake device according to claim 1, wherein neither the resilient portion nor the pressing portion protrudes axially toward the rotor side from the axial opening of the guide groove.
  12. The aforementioned resilient section is provided with a material removal section, as described in claim 1, for the opposed piston type disc brake device.
  13. The opposing piston type disc brake device according to claim 1, wherein the pressing portion presses the axial side surface of the lug portion of the pad.

Description

This invention relates to an opposed-piston type disc brake system. Disc brake systems are widely used due to their excellent heat dissipation and the ability to finely adjust braking force during driving. A disc brake system generates braking force by pressing a pair of pads, positioned on both axial sides of a rotor that rotates with the wheel, against the rotor's axial sides using a piston. When braking is released, the elastic restoring force of the piston seal pulls the piston back into the cylinder, while the axial sides of the rotating rotor press the pads away from the rotor. This separates the pads from the rotor, creating clearance between the pads and the rotor. Unless otherwise specified, axial, radial, and circumferential directions refer to the axial, radial, and circumferential directions of the rotor. Even when pressed against the axial side of the rotor, the pad may not move smoothly away from the rotor but may tilt. When the pad tilts in this way, it may not be possible to separate the pad sufficiently from the rotor, potentially leading to drag between the pad and the rotor. In light of these circumstances, it is being considered to incorporate a pad clip into the disc brake system, and to use the elasticity of the pad clip to separate the pad from the rotor when braking is released. International Publication No. 2014/097098 (Patent Document 1) discloses a structure for opposed-piston disc brake devices that uses a pad clip positioned radially outward of the pad to separate the pad from the rotor when braking is released. Specifically, by making the portion of the pad clip that presses against the outer edge of the pad a tapered surface, the pad is pressed radially inward and simultaneously in the axial direction away from the rotor. Japanese Patent Publication No. 2016-28216 (Patent Document 2) discloses a structure for a floating-type disc brake device that uses a pad clip fixed to the back surface of the pad to separate the pad from the rotor when braking is released. Specifically, a pad clip with a roughly U-shape in radial view is placed on the back surface of the pad, one end of the pad clip is fixed to the back surface of the pad, and the other end of the pad clip abuts against a surface of the support that faces axially away from the rotor. This utilizes the elastic force of the pad clip, which is elastically deformed during braking, to pull the pad away from the rotor when braking is released. International Publication No. 2014/097098Japanese Patent Publication No. 2016-28216 Figure 1 is a front view showing a disc brake device of the first example of the embodiment.Figure 2 is a plan view showing a disc brake device of the first example of the embodiment.Figure 3 is a side view of the disc brake device of the first embodiment, as seen from the entry side.Figure 4 is a bottom view showing a disc brake device of the first example of the embodiment.Figure 5 is a perspective view of the disc brake device of the first embodiment, viewed from the radially outward and inlet side.Figure 6 is a perspective view of the disc brake device of the first embodiment, viewed from the radially inward and rotating side.Figure 7 is a cross-sectional view taken along line A-A in Figure 2.Figure 8 is a magnified view of a portion of Figure 7.Figure 9 is a schematic cross-sectional view of the line B-B in Figure 8.Figure 10 is a diagram from Figure 7 with the inner pad and pad clip omitted.Figure 11(A) is a perspective view of the guide wall portion provided on the outlet side of the inner body, as seen from the circumferential inner side, relating to a first example of the embodiment, and Figure 11(B) is a perspective view showing the state in which a pad clip is attached to the guide groove of the guide wall portion of Figure 11(A).Figure 12 is a front view showing the inner pad removed from a disc brake device according to the first embodiment.Figure 13 is a front view showing the inner pad and pad clip removed from a disc brake device according to the first embodiment.Figure 14 is a cross-sectional view taken along the line C-C in Figure 13.Figure 15 shows a pad clip removed from a disc brake device according to the first embodiment, which is located axially inward and on the rotation side, where (A) is a front view, (B) is a top view, (C) is a bottom view, (D) is a right side view, and (E) is a left side view.Figure 16 is a perspective view of a pad clip, which is located on the axially inward and rotating side, removed from a disc brake device according to the first embodiment, and viewed from four directions on the axially outward side.Figure 17 is a perspective view of a pad clip, which is located on the axially inward and rotating side, removed from a disc brake device according to the first embodiment, and viewed from four directions on the axially inward side.Figure 18 is a diagram corresponding to Figure 11, showing a second example of the embodiment.Figure 19 is a perspective view of the