Floating disc brake system

Abstract

To realize a floating type disc brake device that can prevent surface pressure between an outer body portion of a caliper body and an abutting portion of an outer pad from locally increasing in a diametrically outside portion of the outer pad.SOLUTION: A floating type disc brake device is equipped with an inner pad, an outer pad 5, a support, and a caliper body 3. A bulging portion 32 is provided on almost the entire part axially opposing to a substrate portion 49b of the outer pad 5 of an outer body portion 21 configuring the caliper body 3. On an axially inside surface of the bulging portion 32, an abutting projecting portion 33 is formed, in which an area of a part axially opposing to a diametrically inside half portion of the substrate portion 49b is larger than an area of a part axially opposing to a diametrically outside half portion of the substrate portion 49b. At braking, only tip end surface of the abutting projecting portion 33 abuts on the axially outside surface of the substrate portion 49b.SELECTED DRAWING: Figure 17

Description

Technical Field

[0001] The present invention relates to a floating disk brake device.

Background Art

[0002] Disk brake devices are widely used for braking automobiles and motorcycles. When braking with a disk brake device, a pair of pads arranged on both axial sides of a rotor that rotates together with a wheel are pressed against both axial side surfaces of the rotor by pistons. As such disk brake devices, various structures have been conventionally known. For example, a floating type disk brake device as described in Japanese Utility Model Laid-Open No. 7-38771 (Patent Document 1) has been widely used conventionally because it is advantageous in terms of weight reduction and cost reduction.

[0003] A floating type disk brake device includes a support fixed to a vehicle body, a caliper body supported so as to be axially movable with respect to the support, and inner pads and outer pads supported so as to be axially movable with respect to the support. Here, the axial direction refers to the axial direction of the rotor unless otherwise specified.

[0004] The caliper body has a cylinder and includes an inner body portion disposed inside the axial direction of the rotor and an outer body portion that axially presses the outer pads. Inside the cylinder provided in the inner body portion, a piston that axially presses the inner pads during braking is fitted.

[0005] When braking, pressure oil is sent from a master cylinder to the cylinder, and the inner pads are pressed against the axial side surfaces of the rotor by the pistons. Then, as a reaction force of this pressing force, the caliper body moves axially inward with respect to the support. As a result, the outer body portion presses the outer pads against the axial side surfaces of the rotor. As a result, the rotor is strongly sandwiched from both axial sides by the inner pads and the outer pads, and braking is performed. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Utility Model Publication No. 7-38771 [Overview of the project] [Problems that the invention aims to solve]

[0007] Disc brake systems that have a configuration in which the outer body portion of the caliper body directly presses against the outer pad during braking have the following issues that need improvement.

[0008] In other words, the outer body has a cantilever structure connected to the inner body only at its radially outer end. As a result, as exaggeratedly shown in Figure 25, the pad pressing portion 100a of the outer body 100 that presses against the outer pad 101 undergoes elastic deformation that causes it to lift axially and radially outward during braking. Consequently, the amount of elastic deformation of the pad pressing portion 100a is greater at the radially inner end than at the radially outer end. Therefore, if a structure is adopted in which the pad pressing portion of the outer body makes full contact with the outer pad, the surface pressure at the contact point between the outer body and the outer pad may become locally high at the radially outer end (outer edge) of the outer pad. As a result, uneven wear may occur on the outer pad, or squeaking may occur during braking.

[0009] The present invention has been made to solve the above problems, and aims to provide a floating-type disc brake device that can prevent the surface pressure at the contact portion between the outer body portion of the caliper body and the outer pad from becoming locally high at the radially outer portion of the outer pad. [Means for solving the problem]

[0010] This invention Appearances 1 to 3 The floating disc brake device relating to this both It consists of an inner pad, an outer pad, a support, and a caliper body. The inner pad is positioned axially inward of the rotor. The outer pad is positioned axially outward from the rotor. The support is fixed to the vehicle body and supports the inner pad and the outer pad so that they are movable in the axial direction. The caliper body is supported so as to be able to move in the axial direction relative to the support. The outer pad has an overhang that extends inward in the axial direction over almost the entire portion of the part that faces the substrate in the axial direction. The protruding portion has an axially raised contact projection on its axial inner surface (tip surface), wherein the area of ​​the portion facing the radially inner half of the substrate in the axial direction is larger than the area of ​​the portion facing the radially outer half of the substrate in the axial direction. During braking, the outer body portion contacts only the tip surface of the contact projection with the axial outer surface (back surface) of the substrate portion.

[0011] This invention First aspect In the floating disc brake device relating to the above, the outer body part but The protruding portion has a pair of relief recesses on both circumferential outer sides, which are recessed toward the axial side, to allow the axial outer portion of the support to enter as wear progresses on the inner pad and the outer pad. ru.

[0012] This invention Second aspect In the floating disc brake device relating to the above, the axial height of the contact protrusion but , constant That is .

[0013] This invention Third aspect In the floating disc brake device relating to the above, the contact protrusion but , having a radially extended, band-shaped radial protrusion. ru. In this case, the radial convex portion can be arranged on or near the central axis of the cylinder.

[0014] In the floating disk brake device according to one aspect of the present invention, a plurality of the radial convex portions are provided so as to be separated from each other in the circumferential direction, and the plurality of radial convex portions can also be arranged parallel to each other.

[0015] In the floating disk brake device according to one aspect of the present invention, the overhanging portion has a reinforcing rib on an outer peripheral edge portion that is radially outward from a portion axially facing the substrate portion among the axially inner surfaces, and an end portion on the radially outer side of the radial convex portion can be connected to the reinforcing rib.

[0016] In the floating disk brake device according to one aspect of the present invention, the abutting convex portion can have a circumferentially extending belt-shaped circumferential convex portion. In this case, the circumferential convex portion can be arranged so as to intersect the radial convex portion.

[0017] In the floating disk brake device according to one aspect of the present invention, a plurality of the circumferential convex portions can be provided so as to be separated from each other in the radial direction. ……

[0018] In the floating disk brake device according to one aspect of the present invention, the circumferential convex portion can be arranged at a radial position intersecting the central axis of the cylinder. And / or, the circumferential convex portion can also be arranged at a position radially outside the central axis of the cylinder.

[0019] In the floating disk brake device according to one aspect of the present invention, the circumferential convex portion can be curved so that the radially outer side is convex. In a floating disc brake device according to one aspect of the present invention, the circumferential protrusion can also be made to be linearly extended in the circumferential direction.

[0020] In a floating disc brake device according to one aspect of the present invention, the circumferential dimension of the outer body can be made larger than the circumferential dimension of the support. [Effects of the Invention]

[0021] According to the present invention, a floating-type disc brake device can be realized that prevents the surface pressure at the contact point between the outer body portion of the caliper body and the outer pad from becoming locally high at the radially outer portion of the outer pad. [Brief explanation of the drawing]

[0022] [Figure 1] Figure 1 is a front view of a disc brake device according to the first embodiment, as seen from the axial side. [Figure 2] Figure 2 is a rear view of a disc brake device according to the first embodiment, as seen from the axial inner side. [Figure 3] Figure 3 is a plan view of a disc brake device according to the first embodiment, as seen from the radially outer side. [Figure 4] Figure 4 is a bottom view of a disc brake device according to the first embodiment, viewed from the radially inward direction. [Figure 5] Figure 5 is a side view of a disc brake device according to the first embodiment, as seen from the right side of Figure 1. [Figure 6] Figure 6 is a perspective view of a disc brake device according to the first embodiment, viewed from the axial and radially outward directions. [Figure 7] Figure 7 is a perspective view of a disc brake device according to the first embodiment, viewed from the axially inward and radially outward direction. [Figure 8] Figure 8 is a perspective view of a disc brake device according to the first embodiment, viewed from the axially outer and radially inner directions. [Figure 9] Figure 9 is a perspective view of a disc brake device according to the first embodiment, viewed from both the axial and radial sides. [Figure 10] Figure 10 is a perspective view of a caliper body removed from a disc brake device according to the first embodiment, viewed from the axial and radially outer directions. [Figure 11] Figure 11 is a perspective view of a caliper body removed from a disc brake device according to the first embodiment, viewed from the axially inward and radially outward direction. [Figure 12] Figure 12 is a perspective view of a caliper body removed from a disc brake device according to the first embodiment, viewed from the axially outer and radially inner directions. [Figure 13] Figure 13 is a perspective view of the caliper body removed from a disc brake device according to the first embodiment, viewed from both the axial and radial sides. [Figure 14] Figure 14 is a view of the caliper body outer portion removed from a disc brake device according to the first embodiment, viewed from the axial outside. [Figure 15] Figure 15 is a view of the caliper body outer body portion removed from a disc brake device according to the first embodiment, viewed from the axial inner side. [Figure 16] Figure 16 is a view taken from the axial inner side of a disc brake device according to the first embodiment, with the outer body portion and outer pad of the caliper body removed. [Figure 17] Figure 17 is a partial perspective view taken from the axial inner side of a disc brake device according to the first embodiment, with the outer body portion and outer pad of the caliper body removed. [Figure 18] Figure 18 is a view from the axial outside of a disc brake device according to the first embodiment, with the support and pad clip removed. [Figure 19] Figure 19 is a view of Figure 18 from the right side. [Figure 20]Figure 20 is a perspective view of the support and pad clip removed from the disc brake device according to the first embodiment, viewed from the axial and radially outer sides. [Figure 21] Figure 21 is a partial perspective view of the assembly state of the inner pad and outer pad to the support, as seen from the axially inward and radially outward, relating to the first example of the embodiment. [Figure 22] Figure 22 is a view of the outer pad removed from the disc brake device according to the first embodiment, as seen from the axial outside. [Figure 23] Figure 23 is a diagram corresponding to Figure 15, showing a second example of the embodiment. [Figure 24] Figure 24 is a diagram corresponding to Figure 15, showing a third example of the embodiment. [Figure 25] Figure 25 is a schematic diagram of the caliper body viewed from the circumferential outer side, shown to illustrate the problems of the conventional structure. [Modes for carrying out the invention]

[0023] [First example of an embodiment] A first example of the embodiment will be described using Figures 1 to 22. In this specification and throughout the claims, "axial direction," "radial direction," and "circumferential direction" refer to the axial, radial, and circumferential directions of a disc-shaped rotor that rotates with the wheel, unless otherwise specified. Furthermore, with the disc brake device mounted on the vehicle body, the outer side in the width direction of the vehicle body is referred to as the axial outer side, and the central side in the width direction of the vehicle body is referred to as the axial inner side. Also, the central side in the circumferential direction of the disc brake device is referred to as the circumferential inner side, and both sides in the circumferential direction of the disc brake device are referred to as the circumferential outer sides. In addition, the entry side refers to the side on which the rotor enters the caliper body, and the exit side refers to the side on which the rotor exits the caliper body.

[0024] [Explanation of the structure of the disc brake system] The disc brake device 1 in this example is a floating-type disc brake device and comprises a support 2, a caliper body 3, an inner pad 4, and an outer pad 5.

[0025] <support> Support 2 is a casting made of an iron-based alloy such as cast iron and is fixed to the vehicle body. Support 2 supports the caliper body 3 so that it can move in the axial direction, and also supports the inner pad 4 and the outer pad 5 so that they can move in the axial direction.

[0026] As shown in Figures 18 to 20, the support 2 has a pair of guide portions 9 located at both outer ends in the circumferential direction, an inner circumferential connecting portion 10 located axially inward from the rotor 8 (not shown in Figures 18 to 20, see Figure 3) and extending in the circumferential direction, and an outer circumferential connecting portion 11 located axially outward from the rotor 8 and extending in the circumferential direction. The support 2 is fixed to the suspension system that constitutes the vehicle body using a pair of mounting holes 12 provided at both outer ends in the circumferential direction of the inner circumferential connecting portion 10. In the implementation of the present invention, the outer circumferential connecting portion 11 can be omitted from the support 2.

[0027] Each of the pair of guide sections 9 has an inverted U-shape when viewed from the circumferential direction and is positioned to straddle the rotor 8 from the radially outer side. Each of the pair of guide sections 9 includes an inner guide section 13 for supporting the inner pad 4 so as to be movable in the axial direction, an outer guide section 14 for supporting the outer pad 5 so as to be movable in the axial direction, and a caliper guide section 15 that connects the radially outer ends of the inner guide section 13 and the outer guide section 14 in the axial direction.

[0028] The inner guide portion 13 is positioned axially inward from the rotor 8 and extends radially. The radially inward end of the inner guide portion 13 is connected to the circumferentially outward end of the inner circumferential connecting portion 10. The inner guide portion 13 has an inner guide groove 16 on the radially inward portion of its circumferential inner surface that is recessed toward the circumferential outward direction. The inner guide groove 16 can engage with the lugs 50a provided on the inner pad 4, which will be described later.

[0029] The outer guide portion 14 is positioned axially outward from the rotor 8 and extends radially. The radially inner end of the outer guide portion 14 is connected to the circumferential outer end of the outer-side circumferential connecting portion 11. The outer guide portion 14 has an outer-side guide groove 17 on the radially inner side of its circumferential inner surface, which is recessed toward the circumferential outer side. The outer-side guide groove 17 can engage with the lugs 50b, which will be described later, provided on the outer pad 5. As shown in Figure 19, the axial outer surface of the outer guide portion 14 protrudes axially outward from the axial outer surface of the outer-side circumferential connecting portion 11.

[0030] The caliper guide portion 15 is positioned radially outward from the rotor 8 and extends axially. An axially extending support hole 18 is formed inside the caliper guide portion 15. The support hole 18 opens onto the axially inward surface of the caliper guide portion 15. The leading edge of the slide pin 19, described later, is slidably inserted into the support hole 18. The axially inward end of the caliper guide portion 15 is positioned to protrude axially inward from the inner guide portion 13.

[0031] <Caliper Body> The caliper body 3 is supported so as to be axially movable relative to the support 2 using a pair of slide pins 19.

[0032] The caliper body 3 in this example is not a single-piece structure, but has a segmented structure. That is, as shown in Figures 10 to 13, the caliper body 3 is constructed by connecting an inner body portion 20 and an outer body portion 21, which are configured as separate parts, in the axial direction with a plurality of connecting members 22a and 22b (a total of four in the illustrated example). The plurality of connecting members 22a and 22b are arranged spaced apart in the circumferential direction. Of the plurality of connecting members 22a and 22b, one pair of connecting members 22a, which are located on both outer sides in the circumferential direction, connect the outer ends of the inner body portion 20 and the outer body portion 21 in the axial direction, while the remaining connecting members 22b connect the inner (closer to the center) portions of the inner body portion 20 and the outer body portion 21 in the axial direction. The number of connecting members is not particularly limited when implementing the present invention. Also, when implementing the present invention, the caliper body may have a single-piece structure.

[0033] The inner body portion 20 and the outer body portion 21 can be made of different materials or the same material. In this example, both the inner body portion 20 and the outer body portion 21 are made of an aluminum alloy, but they can also be made of an iron alloy or other material. Furthermore, one of the inner body portion 20 and the outer body portion 21 can be made of an aluminum alloy, and the other can be made of an iron alloy or other material.

[0034] 《Inner Body Section》 The inner body portion 20 is positioned axially inward from the rotor 8. The inner body portion 20 has a pair of cylinders 23, a pair of circumferential arms 24, a pair of radial extensions 25, and a strip-shaped rib 27. When implementing the present invention, the number of cylinders provided in the inner body portion is not particularly limited; there may be only one, or three or more.

[0035] A pair of cylinders 23 are provided in the circumferential inner portion (intermediate portion) of the inner body portion 20. The pair of cylinders 23 are arranged side by side in the circumferential direction with their respective central axes O parallel to the central axis of the rotor 8. The cylinders 23 have a substantially cylindrical shape and open only outward in the axial direction. A piston (not shown) is fitted inside the cylinders 23 so as to be movable in the axial direction.

[0036] A pair of circumferential arms 24 are provided on both circumferential outer portions of the inner body portion 20. The pair of circumferential arms 24 are positioned on both circumferential outer portions of the pair of cylinders 23. The circumferential arms 24 extend circumferentially outward from the outer circumferential surface of the cylinders 23.

[0037] The circumferential arm portion 24 has an insertion hole at its circumferential outer end (tip) for inserting the connecting member 22a in the axial direction, and a fixing hole 26 at its circumferential middle portion for fixing the base end of the slide pin 19. The circumferential outer end of the circumferential arm portion 24 is offset axially outward compared to the circumferential inner end to the middle portion of the circumferential arm portion 24. Therefore, the circumferential arm portion 24 has a substantially L-shape when viewed radially. The axial outer surface of the circumferential outer end of the circumferential arm portion 24 is a flat surface.

[0038] A pair of radially extending portions 25 are positioned circumferentially on the inner (intermediate) portion of the inner body portion 20, spaced apart from each other in the circumferential direction. The pair of radially extending portions 25 are positioned radially outward on the axially outer portion of the pair of cylinders 23. The radially extending portions 25 are plate-shaped and extend radially outward from the outer circumferential surface of the cylinder 23. The radially extending portions 25 have through holes for inserting the connecting member 22b in the axial direction. The axially outer surface of the radially extending portion 25 is a flat surface and is located on the same virtual plane as the axially outer surface of the circumferentially outer end of the circumferential arm portion 24.

[0039] The strip-shaped rib 27 is a thicker section (raised inward axially) compared to other parts, and is provided on the axially inner surface of the inner body section 20. As a result, the inner body section 20 has increased thickness and improved rigidity in the section where the strip-shaped rib 27 is provided.

[0040] The strip-shaped rib 27 extends circumferentially and covers the bottom 23a of each of the pair of cylinders 23 from the axially inward direction, traversing the circumferential direction. The circumferential outer ends of the strip-shaped rib 27 extend circumferentially outward beyond the bottom 23a of the cylinders 23 and are located at the circumferential outer ends of the axially inward surface of the inner body portion 20. Therefore, the strip-shaped rib 27 is provided along almost the entire circumferential length of the axially inward surface of the inner body portion 20.

[0041] Outer Body Section The outer body portion 21 has a substantially bow-shaped axial cover portion 28 positioned axially outward from the outer pad 5, and a partially cylindrical radial cover portion 29 positioned radially outward from the rotor 8. The outer body portion 21 has a substantially L-shaped cross-section with respect to a virtual plane containing the central axis of the rotor 8. The axial cover portion 28 and the radial cover portion 29 are integrally constructed.

[0042] The axial cover portion 28 is configured as a roughly curved flat plate and directly presses the outer pad 5 in the axial direction during braking. The axial cover portion 28 is a part that is visible from the outside when the disc brake device 1 is attached to the vehicle body, and its design surface is formed by its axial outer surface.

[0043] In this example, the circumferential dimension of the axial cover portion 28 is made larger than the circumferential dimension of the support 2, so that both circumferential outer portions of the axial cover portion 28 protrude circumferentially outward from the pair of guide portions 9. The axial cover portion 28 covers the pair of guide portions 9 from the axial outside. In other words, the pair of guide portions 9 are made invisible from the outside. In this example, by making the circumferential dimension of the axial cover portion 28 larger than the circumferential dimension of the support 2, a large design surface formed by the axial outer surface of the axial cover portion 28 is secured.

[0044] In this example, the circumferential dimension of the axial cover portion 28 is made larger than the circumferential dimensions of the radial cover portion 29 and the inner body portion 20, respectively. For this reason, the axial cover portion 28 has substantially triangular plate-shaped wing portions 30 at both circumferential outer ends, which protrude circumferentially outward from the radial cover portion 29 and the inner body portion 20.

[0045] As shown in Figure 15, the axial cover portion 28 has a flat reference surface 31 on its axial inner surface. The axial cover portion 28 has a protruding portion 32 on the circumferential inner side of its axial inner surface that extends axially inward from the reference surface 31. As shown in Figure 17, the protruding portion 32 is provided on almost the entire axial inner surface of the axial cover portion 28 that faces the substrate portion 49b of the outer pad 5, which will be described later, in the axial direction. Therefore, the protruding portion 32 has a shape that substantially matches the substrate portion 49b of the outer pad 5.

[0046] The axial inner surface (tip surface) of the protruding portion 32 is provided with a contact projection (rib) 33 that is raised inward in the axial direction. In this example, of the outer body portion 21, only the contact projection 33 contacts the axial outer surface (back surface) of the substrate portion 49b of the outer pad 5 during braking.

[0047] In this example, the axial height of the contact projection 33 from the reference surface 31 (the amount of protrusion from the reference surface 31) is constant, for example, several millimeters. However, when implementing the present invention, the axial height of the contact projection can be changed according to the radial position and / or circumferential position of the contact projection. Furthermore, the tip surface of the contact projection 33 is made smooth by machining (machined surface). The reason for this is to enable the tip surface of the contact projection 33 to make uniform contact with the contact surface 54 (see Figure 22) of the base portion 49b of the outer pad 5, thereby preventing uneven contact which would cause unstable pressing force on the outer pad 5 and lead to brake squeal. In addition, compared to the case where the axial inner surface of the protruding portion 32 makes full contact with the base portion 49b of the outer pad 5 without providing the contact projection 33, the processing time can be shortened.

[0048] The contact projection 33 has a shape in which the area of ​​the portion facing the radially inner half of the substrate portion 49b in the axial direction is larger than the area of ​​the portion facing the radially outer half of the substrate portion 49b in the axial direction. For this reason, in this example, the shape of the contact projection 33 is made into a roughly grid shape by combining multiple radial projections 34a, 34b and multiple circumferential projections 35a, 35b. As a result, the area of ​​the tip surface of the contact projection 33 is larger in the portion that is radially inner than in the portion that is radially outer, with respect to a virtual circle C that passes through the central axes O of the two cylinders 23 and is centered on the central axis of the rotor 8.

[0049] The contact projection 33 has two radial projections 34a and 34b. Each of the radial projections 34a and 34b extends linearly in the radial direction and is configured in a strip shape. The width dimension of the radial projections 34a and 34b is constant along their entire length. The two radial projections 34a and 34b are spaced apart in the circumferential direction and arranged parallel to each other, and are located near the circumferential inner side of the central axis O of each cylinder 23. When implementing the present invention, one or more radial projections may be provided, and the width dimension of the radial projections may be varied according to their radial position.

[0050] The contact projection 33 has two circumferential projections 35a and 35b. Each of the circumferential projections 35a and 35b extends in the circumferential direction and is configured in a strip shape. When implementing the present invention, one or three or more circumferential projections may be provided.

[0051] Of the two circumferential protrusions 35a and 35b, the circumferential protrusion 35a, which is located radially outward, has a curved arc shape that is convex radially outward, and its width is constant along its entire length. The circumferential protrusion 35a is located in the radial middle of the axial inner surface of the protruding portion 32, and intersects with the radial middle of each of the two radial protrusions 34a and 34b. In other words, the circumferential protrusion 35a crosses the radial middle of each of the two radial protrusions 34a and 34b in the circumferential direction. Furthermore, the circumferential protrusion 35a is located at a radial position that intersects with the central axis O of each cylinder 23. For this reason, the circumferential protrusion 35a is located on the virtual circle C. The circumferential outer ends of the circumferential protrusion 35a do not reach the circumferential outer ends of the axial inner surface of the protruding portion 32.

[0052] Of the two circumferential protrusions 35a and 35b, the circumferential protrusion 35b, which is located radially inward, has a linear shape and its width dimension differs depending on its circumferential position. The circumferential protrusion 35b is located on the inner peripheral edge (radially inward end) of the axial inner surface of the protruding portion 32, which is radially inward from the central axis O of each cylinder 23. The circumferential protrusion 35b is connected to the radially inward ends of the two radial protrusions 34a and 34b. Furthermore, the width dimension of the circumferential outer ends of the circumferential protrusion 35b, which are circumferentially outward from the radial protrusions 34a and 34b, is greater than the width dimension of the circumferential inner part, which is circumferentially inward from the radial protrusions 34a and 34b. The circumferential outer ends of the circumferential protrusion 35b are located circumferentially inward from the circumferential outer ends of the circumferential protrusion 35a, and do not reach the circumferential outer ends of the axial inner surface of the protruding portion 32.

[0053] In this example, of the two circumferential protrusions 35a and 35b that constitute the contact protrusion 33, the radially outer circumferential protrusion 35a is positioned on the virtual circle C located in the radial middle of the axially inner surface of the protruding portion 32, and the radially inner circumferential protrusion 35b is positioned on the inner peripheral edge of the axially inner surface of the protruding portion 32. As a result, the area of ​​the tip surface of the contact protrusion 33 is approximately the area of ​​the tip surface of the radially inner circumferential protrusion 35b, and is larger in the radially inner portion than in the portion located radially outer across the virtual circle C.

[0054] The protruding portion 32 has a reinforcing rib 36 on the outer peripheral edge of the axial inner surface of the axial cover portion 28, which is radially outward from the portion facing the substrate portion 49b of the outer pad 5 in the axial direction. The reinforcing rib 36 reinforces the space between the outer peripheral edge of the axial inner surface of the axial cover portion 28 and the axially outward end of the radial inner surface of the radial cover portion 29.

[0055] The reinforcing rib 36 extends in the circumferential direction and is configured in a strip shape. The reinforcing rib 36 has a curved arc shape with a convex radial outward side, and its width is constant along its entire length. The circumferential outer ends of the reinforcing rib 36 reach the circumferential outer ends of the axial inner surface of the protruding portion 32. The radial outer ends of the two radial protrusions 34a and 34b that constitute the contact protrusion 33 are connected to the circumferential middle portion of the reinforcing rib 36. Since the reinforcing rib 36 is provided at a position radially outward from the portion of the outer pad 5 that faces the base portion 49b in the axial direction, it does not come into contact with the axial outer surface of the base portion 49b even during braking.

[0056] In this example, by forming a contact projection 33 on the axial inner surface of the protruding portion 32, a substantially rectangular non-contact portion 53a is formed on the axial inner surface of the protruding portion 32, surrounded on all four sides by the reinforcing rib 36, a circumferential projection 35a, and a pair of radial projections 34a, 34b. In addition, a substantially rectangular non-contact portion 53b is formed, surrounded on all four sides by a pair of circumferential projections 35a, 35b and a pair of radial projections 34a, 34b. In other words, two non-contact portions 53a, 53b are formed inside the contact projection 33.

[0057] The axial cover portion 28 has a pair of relief recesses 37 on both circumferential outer portions of the protruding portion 32 on its axial inner surface, recessed axially outward from the reference surface 31. The relief recesses 37 are provided on the axial inner surface of the axial cover portion 28 in the portion facing the pair of outer guide portions 14 and their vicinity that constitute the support 2 in the axial direction. Specifically, the relief recesses 37 are provided in the portion facing the outer guide portion 14 in the axial direction, and in the portion facing the outer guide portion 14 in the axial direction in the vicinity of the outer guide portion 14 in the circumferential direction.

[0058] Each of the relief recesses 37 has a deep recess 37a on its circumferentially inner side, and a shallow recess 37b on its circumferentially outer side, having a shallower axial depth than the deep recess 37a.

[0059] As wear progresses on the inner pad 4 and outer pad 5, and the caliper body 3 moves axially inward relative to the support 2, the axial outer portion of the outer guide portion 14 and the axial outer portions of the pad clips 7a and 7b, which are mounted on the circumferential inner surface of the outer guide portion 14, can enter the inside of the relief recess 37. Specifically, the axial outer portion of the outer guide portion 14 can enter the inside of the shallow recess 37b, and the axial outer portions of the pad clips 7a and 7b can enter the inside of the deep recess 37a. This configuration prevents interference between the pair of outer guide portions 14 and pad clips 7a and 7b and the outer body portion 21.

[0060] The axial cover portion 28 has through holes 38 into which the axially outer ends of the pad clips 7a and 7b can be inserted. As will be described later, the pad clips 7a and 7b used in this example have a configuration in which the curled portion 52 protrudes significantly outward in the axial direction compared to the rest of the pad clips 7a and 7b. For this reason, in this example, in order to prevent interference between the bottom surface of the deep recess 37a and the curled portion 52, through holes 38 are formed in the axial cover portion 28 into which only the curled portion 52 can be inserted. This suppresses the reduction in rigidity of the outer body portion 21 compared to when the axial depth of the entire deep recess 37a is increased.

[0061] The through-holes 38 are open only to the axial outer surface and the axial inner surface of the axial cover portion 28, and not to other parts (for example, the radial cover portion 29). The through-holes 38 are formed in the axial cover portion 28 in the part that is located near the circumferential inner side of the outer guide portion 14 and faces the internal space of the outer side guide groove 17 in the axial direction.

[0062] The axial cover portion 28 has a first groove 39 on its axial outer surface that connects to the axial outer opening of the through hole 38. Each of the first grooves 39 extends in the circumferential direction, and its circumferential inner end connects to the axial outer opening of the through hole 38. Thus, the axial cover portion 28 has two first grooves 39.

[0063] The width dimension of the first groove 39 is substantially constant along its entire length and is substantially the same as the radial dimension of the axially outer opening of the through hole 38. In this example, the first groove 39 is provided so as to connect to the axially outer opening of the through hole 38, and the width dimension of the first groove 39 is substantially the same as the radial dimension of the axially outer opening of the through hole 38. As a result, the through hole 38 and the first groove 39 can be made to be smoothly continuous, and the axially outer opening of the through hole 38 can be made inconspicuous from the outside. Furthermore, the aesthetic appeal can be enhanced by incorporating the axially outer opening of the through hole 38 as part of the design of the design surface.

[0064] The axial cover portion 28 has a second groove 40 on its axial outer surface that connects the axial outer openings of the through holes 38. The second groove 40 extends in the circumferential direction and is curved such that the radial outer side is convex. The width dimension of the second groove 40 is substantially constant along its entire length and is substantially the same as the radial dimension of the axial outer opening of the through holes 38. Therefore, the pair of first grooves 39 arranged on both circumferential outer sides are smoothly continuous in the circumferential direction via the pair of through holes 38 and the second groove 40.

[0065] The axial cover portion 28 is equipped with an annular fan-shaped display portion 41 on the circumferential middle portion of its axial outer surface, which can be used to display a logo or the like. The display portion 41 is configured as a flat surface and is located radially outward of a pair of through holes 38 and a second groove 40. In this example, since the circumferential dimension of the axial cover portion 28 is larger than the circumferential dimension of the support 2, the circumferential dimension of the display portion 41 can also be made sufficiently large. Since the display portion 41 is surrounded on both circumferential and radially outward sides by the groove portion 42, it appears to float outward in the axial direction and is therefore visible.

[0066] The radial cover portion 29 has a partially cylindrical shape and extends axially inward from the outer peripheral edge of the axial cover portion 28. The radial cover portion 29 covers the pair of guide portions 9 that constitute the support 2, a portion of the rotor 8 in the circumferential direction, and both the inner and outer pads 4 and 5 from the radial outside. The circumferential dimensions of the radial cover portion 29 are the same as the circumferential dimensions of the inner body portion 20.

[0067] The radial cover portion 29 has mounting holes (screw holes) 43 at multiple locations in the circumferential direction (four locations in the illustrated example) for fixing the ends of the connecting members 22a and 22b. The multiple mounting holes 43 are arranged at the same pitch in the circumferential direction as the multiple insertion holes provided in the inner body portion 20. The mounting holes 43 open to the axial inner surface of the radial cover portion 29.

[0068] The radial cover portion 29 has central windows 44 on both radial sides of the axially inward portion of the circumferential center. The central windows 44 have an elongated slit shape in the axial direction. The central windows 44 also open on the axially inward surface of the radial cover portion 29. The central windows 44 can be used to visually check the wear status of the inner pad 4 and the outer pad 5.

[0069] The outer body portion 21, consisting of an axial cover portion 28 and a radial cover portion 29, is fixed to the axially outer side of the inner body portion 20 using connecting members 22a and 22b, which are bolts. Specifically, the tip of the connecting member 22a, which is inserted axially through a through hole provided in the circumferential arm portion 24 of the inner body portion 20, is screwed into a mounting hole 43 provided on the circumferential outer side of the radial cover portion 29 of the outer body portion 21, and the tip of the connecting member 22b, which is inserted axially through a through hole provided in the radial projection portion 25 of the inner body portion 20, is screwed into a mounting hole 43 provided on the circumferential inner side of the radial cover portion 29 of the outer body portion 21. In this way, the outer body portion 21 is connected to the axially outer side of the inner body portion 20 using the connecting members 22a and 22b. Therefore, the outer body portion 21 is a cantilever beam structure connected to the inner body portion 20 only at its radially outer end.

[0070] With the inner body portion 20 and the outer body portion 21 connected, a pair of openings 45 are formed between the axial outer surface of the inner body portion 20 and the axial inner surface of the outer body portion 21. The pair of openings 45 are spaced apart from each other in the circumferential direction and are located on both circumferential outer sides of a pair of radially protruding portions 25. Each of the openings 45 is configured to be approximately rectangular in radial view. In the assembled state of the disc brake device 1, the axially inner portion of the caliper guide portion 15 constituting the support 2 is exposed through the opening 45.

[0071] The caliper body 3 is supported by the support 2 so as to be able to move in the axial direction. For this purpose, the base end of the slide pin 19 is fixed in a fixing hole 26 provided in the circumferential middle part of the circumferential arm portion 24 that constitutes the inner body portion 20, and the front half of the slide pin 19 is inserted inside a support hole 18 formed in the caliper guide portion 15 that constitutes the support 2 so as to be able to move relative to it in the axial direction. In addition, the portion of the outer surface of the slide pin 19 located between the support hole 18 and the fixing hole 26 is covered by a boot 46.

[0072] <Inner pads and outer pads> As shown in Figure 21, the inner pad 4 comprises a lining 47a and a backing plate 48a, and is supported between a pair of inner guide portions 13 that constitute the support 2, allowing for movement in the axial direction.

[0073] The backing plate 48a has a rectangular plate-shaped substrate portion 49a that supports the back surface (inner surface in the axial direction) of the lining 47a, and convex ear portions 50a that protrude outward from both sides in the circumferential direction from the substrate portion 49a. The substrate portion 49a has a shape that substantially matches that of the lining 47a.

[0074] In order to support the inner pad 4 so that it can move in the axial direction relative to a pair of inner guide portions 13, the ear portions 50a constituting the inner pad 4 are engaged with the inner-side guide grooves 16 provided on the inner guide portions 13 in an interlocking manner.

[0075] The outer pad 5 comprises a lining 47b and a backing plate 48b, and is supported between a pair of outer guide sections 14 that constitute the support 2, allowing for movement in the axial direction.

[0076] The back plate 48b has a rectangular plate-shaped base portion 49b that supports the back surface of the lining 47b, and convex ear portions 50b that protrude outward on both sides in the circumferential direction from the base portion 49b. The base portion 49b has a shape that substantially matches that of the lining 47b.

[0077] In order to support the outer pad 5 so that it can move axially with respect to a pair of outer guide portions 14, the ear portions 50b constituting the outer pad 5 are engaged with the outer-side guide grooves 17 provided on the outer guide portion 14 in a concave-concave manner.

[0078] <Pad Clip> Pad clips 6a and 6b are interposed between the circumferential outer surfaces of the backing plate 48a constituting the inner pad 4 and the circumferential inner surfaces of the pair of inner guide portions 13. Similarly, pad clips 7a and 7b are interposed between the circumferential outer surfaces of the backing plate 48b constituting the outer pad 5 and the circumferential inner surfaces of the pair of outer guide portions 14. This allows for smooth axial movement of the inner pad 4 and the outer pad 5.

[0079] The pad clips 6a, 6b, 7a, and 7b are manufactured by press-forming an elastic and corrosion-resistant metal plate, such as a stainless steel plate. As shown in Figure 21, each of the pad clips 6a, 6b, 7a, and 7b is fitted with a return spring 51 that biases the inner pad 4 and outer pad 5 away from the rotor 8 when the braking force is released.

[0080] Of the four pad clips 6a, 6b, 7a, and 7b, the pair of pad clips 6a and 7a positioned on the insertion side (right side in Figure 18), and the pair of pad clips 6b and 7b positioned on the discharge side (left side in Figure 18), each have a symmetrical shape with respect to the axial direction. Furthermore, the pair of pad clips 6a and 6b positioned opposite each other in the circumferential direction, and the pair of pad clips 7a and 7b positioned opposite each other in the circumferential direction, each have a symmetrical shape with respect to the circumferential direction.

[0081] The pad clips 6a and 6b, positioned axially inward from the rotor 8, elastically press the inner pad 4 inward in the circumferential direction, and also elastically press the lugs 50a constituting the inner pad 4 outward in the radial direction.

[0082] The pad clips 7a and 7b, positioned axially outward from the rotor 8, elastically press the outer pad 5 inward in the circumferential direction and elastically press the lugs 50b constituting the outer pad 5 radially outward. Furthermore, as shown in Figure 19, when the pad clips 7a and 7b are attached to the circumferential inner surface of the outer guide portion 14, the axially outward portions of the pad clips 7a and 7b are positioned to protrude axially outward from the outer guide portion 14. In particular, the curl portion 52 of the pad clips 7a and 7b, which has a partially cylindrical shape for elastically pressing the lugs 50b radially outward, protrudes significantly more axially outward than the other parts of the pad clips 7a and 7b, and is positioned to protrude the most axially outward from the outer guide portion 14.

[0083] Therefore, as wear progresses on the inner pad 4 and outer pad 5, and the caliper body 3 moves axially inward relative to the support 2, the curled portions 52 that make up the pad clips 7a and 7b are more likely to interfere with the axial cover portion 28 that makes up the outer body portion 21 during braking. In this example, the axial cover portion 28 is provided with a through hole 38 in the part that faces the internal space of the outer-side guide groove 17 in the axial direction, and the curled portion 52 can be inserted into the through hole 38, thereby preventing interference between the curled portion 52 and the axial cover portion 28.

[0084] [Explanation of disc brake system operation] To perform braking with the disc brake device 1 in this example, pressurized oil is supplied from the master cylinder to the cylinder 23 of the caliper body 3. This pushes a piston (not shown) outward in the axial direction. The piston then presses the inner pad 4 against the axially inner surface of the rotor 8, moving the caliper body 3 axially inward relative to the support 2. This presses the contact protrusion 33 of the overhang 32 provided on the axial cover portion 28 of the caliper body 3 against the back surface of the backing plate 48b of the outer pad 5. This presses the outer pad 5 against the axially outer surface of the rotor 8. As a result, the rotor 8 is strongly clamped from both axial sides by the inner pad 4 and the outer pad 5, and braking is performed.

[0085] When braking is released, pressurized oil is discharged from the cylinder 23 of the caliper body 3. This causes the piston to be pulled back (rolled back) towards the rear (axially inward) side of the cylinder 23 by the elastic restoring force of the piston seal (not shown) fitted onto the piston, securing clearance between the inner pad 4 and the axially inward surface of the rotor 8. As a result, the caliper body 3 moves slightly axially outward relative to the support 2, and clearance is also secured between the outer pad 5 and the axially outward surface of the rotor 8.

[0086] According to the disc brake device 1 of this example, as described above, it is possible to prevent the surface pressure at the contact point between the outer body portion 21 of the caliper body 3 and the outer pad 5 from becoming locally high at the radially outer portion of the outer pad 5.

[0087] In other words, in this example, instead of the entire axial inner surface (tip surface) of the protruding portion 32 provided on the outer body portion 21 making full contact with the axial outer surface of the substrate portion 49b of the outer pad 5, only the tip surface of the contact projection 33 formed on the axial inner surface of the protruding portion 32 is made to contact the axial outer surface of the substrate portion 49b. Moreover, in this example, by devising the shape and formation position of the contact projection 33, the area of ​​the portion facing the axial direction of the radial inner half of the substrate portion 49b is made larger than the area of ​​the portion facing the axial direction of the radial outer half of the substrate portion 49b.

[0088] Therefore, even when the axial cover portion 28 of the outer body portion 21 elastically deforms outward in the axial direction and radially outward during braking, as shown in Figure 25, sufficient contact area can be secured between the tip surface of the contact projection 33 and the radially inner half of the axially outer surface of the base portion 49b. Consequently, it is possible to prevent the surface pressure at the contact portion between the outer body portion 21 and the outer pad 5 from becoming locally high at the radially outer portion of the outer pad 5. As a result, the unevenness of the surface pressure of the outer pad 5 relative to the rotor 8 can be reduced, thereby suppressing uneven wear on the lining 47b of the outer pad 5 and preventing squeaking during braking.

[0089] Furthermore, in this example, the radially extended radial protrusions 34a and 34b constituting the contact protrusion 33 are positioned near the circumferential inner side of the respective central axis O of the cylinder 23, and the circumferentially extended circumferential protrusion 35a constituting the contact protrusion 33 is positioned at a radial position intersecting the respective central axis O of the cylinder 23. As a result, sufficient surface pressure can be secured at the radial intermediate portion of the outer pad 5 at the contact point between the outer body portion 21 and the outer pad 5. Consequently, the contact area between the rotor 8 and the lining 47b of the outer pad 5 can be increased, and the unevenness of the surface pressure of the outer pad 5 relative to the rotor 8 can be reduced.

[0090] Furthermore, since the circumferentially extended circumferential protrusions 35b that constitute the contact protrusion 33 are positioned on the inner peripheral edge of the axially inner surface of the protruding portion 32, it is possible to ensure the surface pressure at the radially inner portion (inner peripheral edge) of the outer pad 5, where the surface pressure tends to be lowest if the contact protrusion 33 were not provided.

[0091] Furthermore, the radially extended radial protrusions 34a and 34b that constitute the contact protrusion 33 can also increase the bending rigidity of the axial cover portion 28 of the outer body portion 21. As a result, the elastic deformation of the axial cover portion 28, as shown in Figure 25, can be suppressed. Therefore, from this perspective as well, it is possible to prevent the surface pressure at the contact portion between the outer body portion 21 and the outer pad 5 from becoming locally high on the radially outer portion of the outer pad 5.

[0092] Furthermore, in this example, the outer peripheral edge of the axial inner surface of the axial cover portion 28 and the axial outer end of the radial inner surface of the radial cover portion 29 of the outer body portion 21 are reinforced by a reinforcing rib 36. Therefore, the reinforcing rib 36 also suppresses the elastic deformation of the axial cover portion 28 as shown in Figure 25. Moreover, since the reinforcing rib 36 is connected to the radial outer ends of the radial protrusions 34a and 34b, the effect of improving rigidity can be enhanced compared to the case where the reinforcing rib 36 and the radial protrusions 34 are not connected. Thus, from this perspective as well, it is possible to prevent the surface pressure at the contact portion between the outer body portion 21 and the outer pad 5 from becoming locally high at the radial outer portion of the outer pad 5.

[0093] [Second example of an embodiment] A second example of the embodiment will be explained with reference to Figure 23.

[0094] In this example, only the shape of the contact projection 33a provided on the axial inner surface of the protruding portion 32 of the outer body portion 21 is changed from the structure of the first example of the embodiment.

[0095] In other words, in this example, the contact projection 33a is composed of three radial projections 34a, 34b, and 34c and two circumferential projections 35a and 35b. That is, the contact projection 33a has a configuration in which one radially extended, band-shaped radial projection 34c is added to the contact projection 33 of the first example of the embodiment. The radial projection 34c is located in the circumferential center of the axial inner surface of the protruding portion 32 and is arranged parallel to the remaining two radial projections 34a and 34b. In this example, four substantially rectangular non-contact portions 53c, 53d, 53e, and 53f are formed inside the contact projection 33b.

[0096] In this example having the above configuration, the contact projection 33a has one more radially extended radial projection 34a compared to the structure of the first example of the embodiment, which allows for a greater increase in the bending rigidity of the axial cover portion 28 of the outer body portion 21. As a result, the amount of elastic deformation of the axial cover portion 28 can be reduced, and the surface pressure at the contact portion between the outer body portion 21 and the outer pad 5 can be more effectively prevented from becoming locally high at the radially outer portion of the outer pad 5. The other configurations and effects are the same as in the first example of the embodiment.

[0097] [Third example of an embodiment] A third example of the embodiment will be described with reference to Figure 24.

[0098] In this example, only the shape of the contact projection 33b provided on the axial inner surface of the protruding portion 32 of the outer body portion 21 is changed from the structure of the first example of the embodiment.

[0099] In other words, in this example as well, the contact projection 33b is composed of two radial projections 34a, 34b and two circumferential projections 35c, 35d, but the width dimension of the circumferential intermediate portion of the two circumferential projections 35c, 35d differs from the structure of the first example of the embodiment. In this example, the width dimension of the circumferential intermediate portion of the two circumferential projections 35c, 35d is increased to connect the circumferential intermediate portions of the two circumferential projections 35c, 35d radially. For this reason, only one non-contact portion 53a is formed inside the contact projection 33a. To put it another way, in this example, a rectangular projection with the same shape as the non-contact portion 53b is newly formed at the position of the non-contact portion 53b in the structure of the first example of the embodiment.

[0100] In this example, the contact area between the contact projection 33b and the radially inner half of the substrate portion 49b can be increased compared to the structure of the first example of the embodiment. Therefore, the surface pressure at the contact point between the outer body portion 21 of the caliper body 3 and the outer pad 5 can be more effectively prevented from becoming locally high at the radially outer portion of the outer pad 5. The other configurations and effects are the same as in the first example of the embodiment.

[0101] Although embodiments of the present invention have been described above, the present invention is not limited thereto and can be modified as appropriate without departing from the technical spirit of the invention. Furthermore, the structures of each example of the embodiments can be combined as appropriate, as long as no contradictions arise.

[0102] In the structures of each embodiment, the case in which the contact protrusion is composed of a radial protrusion and a circumferential protrusion has been described. However, when implementing the present invention, the contact protrusion can be composed of only a radial protrusion, or only a circumferential protrusion, or it can be composed of protrusions having other shapes.

[0103] In the structures of each embodiment, a structure having two cylinders in the inner body is shown, but when implementing the present invention, the number of cylinders may be one or three or more. [Explanation of Symbols]

[0104] 1. Disc brake system 2 Support 3 Caliper Body 4 Inner pads 5 Outer pads 6a, 6b Pad Clips 7a, 7b Pad clips 8 rotors 9 Guide section 10 Inner side circumferential connecting portion 11 Outer side circumferential connecting section 12 mounting holes 13 Inner Guide Section 14 Outer Guide Section 15 Caliper guide section 16 Inner side guide groove 17 Outer side guide groove 18 Support hole 19 slide pins 20 Inner Body Section 21 Outer Body Section 22a, 22b Connecting members 23 liters 24 Circumferential arm section 25 Radial overhang 26 fixing hole 27. Rib strips 28 Axial covering portion 29 Radial covering portion 30 Wings 31 Reference plane 32 Overhang 33, 33a, 33b Contact convex part 34a, 34b, 34c Radial protrusions 35a, 35b Circumferential protrusions 36 Reinforcement Ribs 37 Relief recess 37a deep recess 37b Shallow recess 38 Through holes 39 First groove 40 Second groove 41 Display section 42 Groove 43 mounting holes 44 Central window 45 Opening 46 Boots 47a, 47b lining 48a, 48b Backing 49a, 49b Substrate section 50a, 50b ears 51 Return spring 52 Curl section 53a~53f Non-contact part 54 Contact surface 100 Outer Body Parts 100a Pad pressing area 101 Outer Pad

Claims

1. The inner pad is positioned axially inward of the rotor, An outer pad positioned axially outward from the rotor, A support fixed to the vehicle body, which supports the inner pad and the outer pad so that they can move in the axial direction, The caliper body is supported with respect to the aforementioned support so as to be movable in the axial direction, The outer pad has a base plate portion that supports the lining and a back plate having ear portions. The caliper body has a cylinder and an inner body portion that is positioned axially inward from the rotor, and an outer body portion that presses against the outer pad during braking. The outer body portion has a protruding portion that extends axially inward over almost the entire portion facing the substrate portion in the axial direction, and has a pair of relief recesses that are recessed axially outward on both circumferential outer sides of the protruding portion, for allowing the axial outer portion of the support to enter when wear of the inner pad and the outer pad progresses. The protruding portion has an axially raised contact projection on its axial inner surface, wherein the area of ​​the portion facing the radially inner half of the substrate in the axial direction is larger than the area of ​​the portion facing the radially outer half of the substrate in the axial direction. The outer body portion, during braking, contacts only the tip surface of the contact projection with the axial outer surface of the substrate portion. Floating disc brake system.

2. The inner pad is positioned axially inward of the rotor, An outer pad positioned axially outward from the rotor, A support fixed to the vehicle body, which supports the inner pad and the outer pad so that they can move in the axial direction, The caliper body is supported with respect to the aforementioned support so as to be movable in the axial direction, The outer pad has a base plate portion that supports the lining and a back plate having ear portions. The caliper body has a cylinder and an inner body portion that is positioned axially inward from the rotor, and an outer body portion that presses against the outer pad during braking. The outer body portion has an overhang that extends inward in the axial direction over almost the entire portion facing the substrate portion in the axial direction, The protruding portion has an axially raised contact projection on its axial inner surface, wherein the area of ​​the portion facing the radially inner half of the substrate in the axial direction is larger than the area of ​​the portion facing the radially outer half of the substrate in the axial direction. The axial height of the aforementioned contact protrusion is constant. The outer body portion, during braking, contacts only the tip surface of the contact projection with the axial outer surface of the substrate portion. Floating disc brake system.

3. The inner pad is positioned axially inward of the rotor, An outer pad positioned axially outward from the rotor, A support fixed to the vehicle body, which supports the inner pad and the outer pad so that they can move in the axial direction, The caliper body is supported with respect to the aforementioned support so as to be movable in the axial direction, The outer pad has a base plate portion that supports the lining and a back plate having ear portions. The caliper body has a cylinder and an inner body portion that is positioned axially inward from the rotor, and an outer body portion that presses against the outer pad during braking. The outer body portion has an overhang that extends inward in the axial direction over almost the entire portion facing the substrate portion in the axial direction, The protruding portion has an axially raised contact projection on its axial inner surface, wherein the area of ​​the portion facing the radially inner half of the substrate in the axial direction is larger than the area of ​​the portion facing the radially outer half of the substrate in the axial direction. The aforementioned contact projection has a radially extended, band-shaped radial projection, The outer body portion, during braking, contacts only the tip surface of the contact projection with the axial outer surface of the substrate portion. Floating disc brake system.

4. The floating disc brake device according to claim 3, wherein the radial projection is located on or near the central axis of the cylinder.

5. The radial protrusions are provided in multiple locations spaced apart from each other in the circumferential direction. The multiple radial protrusions are arranged parallel to each other. A floating disc brake device as described in any one of claims 3 to 4.

6. The aforementioned protruding portion has reinforcing ribs on the outer peripheral edge that is radially outward from the portion of the axial inner surface that faces the substrate portion in the axial direction. The radially outer end of the radially protruding portion is connected to the reinforcing rib. A floating disc brake device as described in any one of claims 3 to 5.

7. The abutment projection has a band-shaped circumferential projection that extends in the circumferential direction, as described in any one of claims 1 to 6.

8. The floating disc brake device according to claim 7, which references any one of claims 3 to 6, wherein the circumferential protrusion is arranged to intersect with the radial protrusion.

9. The floating disc brake device according to any one of claims 7 to 8, wherein the circumferential protrusions are provided in a plurality of locations spaced apart from each other in the radial direction.

10. The floating disc brake device according to any one of claims 7 to 9, wherein the circumferential protrusion is positioned radially at a location intersecting the central axis of the cylinder.

11. The floating disc brake device according to any one of claims 7 to 9, wherein the circumferential protrusion is positioned radially inward from the central axis of the cylinder.

12. The floating disc brake device according to any one of claims 7 to 11, wherein the circumferential protrusion is curved such that the radially outward side is convex.

13. A floating disc brake device according to any one of claims 1 to 12, wherein the circumferential dimension of the outer body portion is greater than the circumferential dimension of the support.

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