Floating disc brake device

Abstract

To realize a floating type disc brake device capable of preventing interference between an outer guide portion of a support or / and a pad clip and an outer body portion of a caliper body.SOLUTION: A floating type disc brake device 1 is equipped with an inner pad, an outer pad 5, a support 2, and a caliper body 3. The support 2 has an inner guide portion supporting the inner pad 4 so as to move in an axial direction, and an outer guide portion supporting the outer pad 5 so as to move in the axial direction, both outside portions in a circumferential direction. Among an outer body portion 21 configuring the caliper body 3, at a part opposing in the axial direction to the outer guide portion or / and a vicinity portion of the outer guide portion, a through-hole 35 opening only in the axial direction is formed.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] FIG. 38 shows a floating disc brake device 100 of a conventional structure described in Japanese Utility Model Publication No. 57-1922 (Patent Document 1).

[0003] The disc brake device 100 includes a support 101, a caliper body 102, an inner pad 103, and an outer pad 104. During braking, by axially displacing the caliper body 102 supported by the support 101, a rotor 105 that rotates with the wheel is clamped from both axial sides by the inner pad 103 and the outer pad 104.

[0004] Throughout this specification and the entire scope of the claims, unless otherwise specified, the "axial direction", "radial direction", and "circumferential direction" refer to the axial direction, radial direction, and circumferential direction of a disc-shaped rotor that rotates with the wheel. Also, with the disc brake device attached to the vehicle body, the outer side in the width direction of the vehicle body is referred to as the outer side in the axial direction, and the central side in the width direction of the vehicle body is referred to as the inner side in the axial direction. Further, the central side in the circumferential direction of the disc brake device is referred to as the inner side in the circumferential direction, and both sides in the circumferential direction of the disc brake device are referred to as the outer side in the circumferential direction. Furthermore, the entry side refers to the side where the rotor enters with respect to the caliper body, and the exit side refers to the side where the rotor exits from the caliper body.

[0005] The support 101 is fixed to the suspension device and has a pair of guide portions 106 having an inverted U shape in the circumferential view and a circumferential connecting portion 107 that circumferentially connects the pair of guide portions 106.

[0006] Each of the pair of guide portions 106 includes an inner guide portion 108, an outer guide portion 109, and a caliper guide portion 110.

[0007] The caliper guide portion 110 axially connects the radially outer ends of the inner guide portion 108 and the outer guide portion 109, respectively. A support hole 111 is formed inside the caliper guide portion 110. The support hole 111 opens to the axially inner surface of the caliper guide portion 110.

[0008] The caliper body 102 has a bifurcated outer body portion 112 at the axially outer portion and an inner body portion 113 at the axially inner portion, respectively. The inner body portion 113 has a cylinder 114. Inside the cylinder 114, a piston 115 is fitted so as to be axially movable. The caliper body 102 is supported by a pair of slide pins 116 so as to be axially movable with respect to the support 101. Each of the slide pins 116 has a base end portion fixed to the caliper body 102 and a tip portion slidably inserted into the support hole 111 provided in the caliper guide portion 110.

[0009] The inner pad 103 is disposed axially inside the rotor 105 and is supported so as to be axially movable with respect to the pair of inner guide portions 108. The outer pad 104 is disposed axially outside the rotor 105 and is supported so as to be axially movable with respect to the pair of outer guide portions 109.

[0010] When braking is performed, pressure oil is sent from the master cylinder to the cylinder 114, and the inner pad 103 is pressed against the axially inner surface of the rotor 105 from above to below in FIG. 38 by the piston 115. Then, as a reaction to this pressing force, the caliper body 102 moves upward in FIG. 38 based on the sliding of the slide pin 116 and the support hole 111. And the outer body portion 112 presses the outer pad 104 against the axially outer surface of the rotor 105. As a result, the rotor 105 is strongly clamped from both axial sides, and braking is performed.

Prior Art Documents

Patent Documents

[0011] [Patent Document 1] Japanese Utility Model Publication No. 57-1922 [Summary of the Invention] [Problems to be Solved by the Invention]

[0012] In recent years, even in floating disc brake devices, the importance of design has been increasing, and it has been desired to secure a design surface of the same size as that of opposed piston type disc brake devices.

[0013] In view of such circumstances, with the disc brake device attached to the vehicle body, the circumferential dimension of the outer body portion (claw portion) constituting the caliper body, which is visible from the outside, is increased, and the outer body portion covers a pair of guide portions constituting the support from the outside in the axial direction. By increasing the circumferential dimension of the outer body portion in this way, the design surface constituted by the outer surface in the axial direction of the outer body portion can be enlarged.

[0014] However, when the outer body portion covers a pair of guide portions of the support from the outside in the axial direction, if the wear of the inner pad and the outer pad progresses and the caliper body moves inward in the axial direction with respect to the support, the gap between the outer guide portion constituting the guide portion and the outer body portion becomes smaller. Therefore, during braking, the outer guide portion and the outer body portion are likely to interfere.

[0015] In many cases, a pad clip made of a metal plate is attached to the outer guide portion to enable smooth axial movement of the outer pad. Depending on the shape of the pad clip used, the outer portion in the axial direction of the pad clip may protrude axially outside the outer guide portion. Therefore, when such a pad clip is used, the pad clip and the outer body portion are likely to interfere.

[0016] The present invention has been made to solve the above problems, and an object thereof is to provide a floating type disc brake device capable of preventing interference between an outer guide portion of a support or / and a pad clip attached to the outer guide portion and an outer body portion of a caliper body.

Means for Solving the Problems

[0017] A floating type disc brake device according to an aspect of the present invention includes an inner pad, an outer pad, a support, and a caliper body. The inner pad is disposed inside the rotor in the axial direction. The outer pad is disposed outside the rotor in the axial direction. The support is fixed to the vehicle body and supports each of the inner pad and the outer pad so as to be axially movable. The caliper body is supported so as to be movable axially with respect to the support. The support has an inner guide portion that supports the inner pad so as to be axially movable and an outer guide portion that supports the outer pad so as to be axially movable on each of both outer circumferential portions. The caliper body has a cylinder and has an inner body portion disposed inside the rotor in the axial direction and an outer body portion that presses the outer pad during braking. The outer body portion has a through hole that opens only in the axial direction in a portion that axially opposes the outer guide portion or / and a vicinity portion of the outer guide portion.

[0018] The floating type disc brake device according to an aspect of the present invention further includes a pad clip disposed between the outer pad and the outer guide portion, and a part of the pad clip can be inserted inside the through hole. Inside the through hole, a portion that protrudes most axially outward among the pad clips can be inserted.

[0019] In the floating disk brake device according to one aspect of the present invention, the through hole can have a shape and size into which a part of the pad clip can be inserted with substantially no gap.

[0020] In the floating disk brake device according to one aspect of the present invention, the outer pad has convex ear portions protruding in the circumferential direction, the outer guide portion has guide concave grooves engageable with the ear portions, and the through hole can be provided in a portion axially opposed to the internal space of the guide concave grooves.

[0021] In the floating disk brake device according to one aspect of the present invention, regarding the through hole, the circumferential dimension can be made larger than the radial dimension.

[0022] In the floating disk brake device according to one aspect of the present invention, the through hole can have an opening shape that is substantially polygonal in the axial view. In this case, the opening shape (cross-sectional shape) of the through hole can be, for example, a rectangle (including a square), a trapezoid, a pentagon, a parallelogram, or the like.

[0023] In the floating disk brake device according to one aspect of the present invention, the cross-sectional shape of the through hole can be changed according to the axial position.

[0024] In the floating disk brake device according to one aspect of the present invention, the circumferential dimension of the outer body portion can be made larger than the circumferential dimension of the support.

[0025] In the floating disk brake device according to one aspect of the present invention, a concave groove leading to the opening of the through hole can be provided on the axially outer surface of the outer body portion.

[0026] In the floating disk brake device according to one aspect of the present invention, the concave groove can be extended in the circumferential direction.

[0027] In the floating disc brake device according to one aspect of the present invention, the outer body portion has a substantially arcuate shape when viewed in the axial direction, and the concave groove can be opened on the radially inner surface or the radially outer surface of the outer body portion.

[0028] In the floating disc brake device according to one aspect of the present invention, the bottom surface of the concave groove can be a convex curved surface that is arcuately curved such that the middle portion in the width direction protrudes axially outward from both side portions in the width direction.

[0029] In the floating disc brake device according to one aspect of the present invention, the bottom surface of the concave groove can be a concave curved surface that is arcuately curved such that the middle portion in the width direction is recessed axially inward from both side portions in the width direction.

[0030] In the floating disc brake device according to one aspect of the present invention, the central axis of the through hole and the central axis of the rotor can be parallel to each other.

[0031] In the floating disc brake device according to one aspect of the present invention, the outer body portion can have two through holes.

Advantages of the Invention

[0032] According to the present invention, it is possible to realize a floating disc brake device that can prevent interference between the outer guide portion of the support or / and the pad clip attached to the outer guide portion and the outer body portion of the caliper body.

Brief Description of the Drawings

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DETAILED DESCRIPTION OF THE INVENTION

[0034] [First Example of the Embodiment] The first example of the embodiment will be described with reference to FIGS. 1 to 24.

[0035] 〔Structural Explanation of Disc Brake Device〕 The disc brake device 1 of this example is a floating type disc brake device, and includes a support 2, a caliper body 3, an inner pad 4, an outer pad 5, and four pad clips 6a, 6b, 7a, and 7b.

[0036] 〈Support〉 The support 2 is a casting made of an iron-based alloy such as cast iron and is fixed to the vehicle body. The support 2 supports the caliper body 3 so as to be axially movable, and supports each of the inner pad 4 and the outer pad 5 so as to be axially movable.

[0037] As shown in FIGS. 17 to 19, the support 2 includes a pair of guide portions 9 disposed at both outer ends in the circumferential direction, an inner circumferential connection portion 10 disposed axially inside the rotor 8 (not shown in FIGS. 17 to 19, see FIG. 3) and extending in the circumferential direction, and an outer circumferential connection portion 11 disposed axially outside the rotor 8 and extending in the circumferential direction. The support 2 is fixed to a suspension device constituting the vehicle body by using a pair of mounting holes 12 provided at both ends in the circumferential direction of the inner circumferential connection portion 10. In addition, when implementing the present invention, the outer circumferential connection portion 11 can be omitted from the support 2.

[0038] Each of the pair of guide portions 9 has an inverted U shape in the circumferential view and is disposed so as to straddle the rotor 8 from the radially outer side. Each of the pair of guide portions 9 includes an inner guide portion 13 for supporting the inner pad 4 so as to be axially movable, an outer guide portion 14 for supporting the outer pad 5 so as to be axially movable, and a caliper guide portion 15 that axially connects the radially outer ends of the inner guide portion 13 and the outer guide portion 14.

[0039] The inner guide portion 13 is disposed axially inward of the rotor 8 and extends in the radial direction. The radially inner end of the inner guide portion 13 is connected to the circumferentially outer end of the inner circumferential connection portion 10. The inner guide portion 13 has an inner guide concave groove 16 recessed outward in the circumferential direction at the radially inner portion of the circumferentially inner surface. The inner guide concave groove 16 can engage with an ear portion 47a (described later) provided on the inner pad 4. The inner guide portion 13 has a protruding portion (not shown) protruding inward in the circumferential direction at the radially intermediate portion of the circumferentially inner surface (radially outside the inner guide concave groove 16).

[0040] The outer guide portion 14 is disposed axially outside the rotor 8 and extends in the radial direction. The radially inner end of the outer guide portion 14 is connected to the circumferentially outer end of the outer circumferential connection portion 11. The outer guide portion 14 has an outer guide concave groove 17 recessed outward in the circumferential direction at the radially inner portion of the circumferentially inner surface. The outer guide concave groove 17 can engage with an ear portion 47b (described later) provided on the outer pad 5. The outer guide portion 14 has a protruding portion 18 protruding inward in the circumferential direction at the radially intermediate portion of the circumferentially inner surface (radially outside the outer guide concave groove 17). As shown in FIG. 18, the axially outer surface of the outer guide portion 14 protrudes axially outside the axially outer surface of the outer circumferential connection portion 11.

[0041] The caliper guide portion 15 is disposed radially outside the rotor 8 and extends in the axial direction. A support hole 65 extending in the axial direction is formed inside the caliper guide portion 15. The support hole 65 opens to the axially inner surface of the caliper guide portion 15. The leading half of a slide pin 19 (described later) is slidably inserted into the support hole 65. The axially inner end of the caliper guide portion 15 is disposed to protrude axially inward of the inner guide portion 13.

[0042] 〈Caliper Body〉 The caliper body 3 is made of an aluminum-based alloy or an iron-based alloy and has a boat shape. The caliper body 3 is supported by a pair of slide pins 19 so as to be axially movable relative to the support 2.

[0043] The caliper body 3 in this example does not have an integral structure but a split structure. That is, as shown in FIGS. 10 to 13, the caliper body 3 is configured by axially connecting an inner body portion 20 and an outer body portion 21, which are separately formed from each other, by a plurality of (a total of four in the illustrated example) connecting members 22a and 22b. In the case of implementing the present invention, the caliper body may have an integral structure.

[0044] 《Inner body portion》 The inner body portion 20 is disposed axially inside the rotor 8. The inner body portion 20 has a pair of cylinders 23, a pair of circumferential arms 24, and a pair of radially projecting portions 25. In the case of implementing the present invention, the number of cylinders provided in the inner body portion is not particularly limited, and only one cylinder may be provided, or three or more cylinders may be provided.

[0045] The pair of cylinders 23 are provided at the circumferential 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 parallel to the central axis of the rotor 8. The cylinder 23 has a substantially cylindrical shape and is open only axially outward. A piston (not shown) is fitted inside the cylinder 23 so as to be axially movable.

[0046] The pair of circumferential arms 24 are provided at both outer circumferential portions of the inner body portion 20. The pair of circumferential arms 24 are arranged on both outer circumferential sides of the pair of cylinders 23. The circumferential arm 24 extends outward in the circumferential direction from the outer circumferential surface of the cylinder 23.

[0047] The circumferential wrist portion 24 has an insertion hole for axially inserting the connecting member 22a at its circumferentially outer end (tip end), and a fixing hole 26 for fixing the base end portion of the slide pin 19 at its circumferential intermediate portion. The circumferentially outer end of the circumferential wrist portion 24 is offset axially outward compared to the circumferentially inner end to the intermediate portion of the circumferential wrist portion 24. For this reason, the circumferential wrist portion 24 has a substantially L-shaped configuration when viewed in the radial direction. The axially outer surface of the circumferentially outer end of the circumferential wrist portion 24 is a flat surface.

[0048] The pair of radially projecting portions 25 are arranged at the circumferential intermediate portion of the inner body portion 20 while being spaced apart from each other in the circumferential direction. The pair of radially projecting portions 25 are arranged radially outside the axially outer portions of the pair of cylinders 23. The radially projecting portion 25 is configured in a flat plate shape and extends radially outward from the outer peripheral surface of the cylinder 23. The radially projecting portion 25 has an insertion hole for axially inserting the connecting member 22b. The axially outer surface of the radially projecting 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 wrist portion 24.

[0049] The inner body portion 20 has a circumferentially extending strip-shaped rib 27 on its axially inner surface. The strip-shaped rib 27 covers the respective bottoms of the pair of cylinders 23 so as to cross in the circumferential direction. The circumferential intermediate portion of the strip-shaped rib 27 is curved in a substantially arc shape such that the radially outer side is convex when viewed in the axial direction. Both circumferentially outer ends of the strip-shaped rib 27 are arranged at both circumferentially outer portions of the inner body portion 20 and are arranged in the vicinity of the axially inner ends of the connecting member 22a arranged on the circumferentially outer side.

[0050] 《Outer body portion》 The outer body portion 21 has a substantially arcuate axially covering portion 28 arranged axially outside the outer pad 5 and a partially cylindrical radially covering portion 29 arranged radially outside the rotor 8. The outer body portion 21 has a substantially L-shaped cross-sectional shape with respect to the virtual plane including the central axis of the rotor 8. The axially covering portion 28 and the radially covering portion 29 are integrally configured.

[0051] The axial covering portion 28 is configured in a substantially arcuate flat plate shape and directly presses the outer pad 5 in the axial direction during braking. The axial covering portion 28 is a portion that can be visually recognized from the outside when the disc brake device 1 is attached to the vehicle body, and the design surface is formed by the axially outer surface.

[0052] In this example, the circumferential dimension of the axial covering portion 28 is made sufficiently larger than that of the outer body portion 112 of the conventional structure shown in FIG. 38. Specifically, the circumferential dimension of the axial covering portion 28 is made larger than the circumferential dimension of the support 2, and both outer circumferential portions of the axial covering portion 28 protrude outward in the circumferential direction from a pair of guide portions 9. And the axial covering portion 28 covers the pair of guide portions 9 from the axially outer side. In other words, a pair of guide portions 9 are made not visible from the outside. In the case of this example, by making the circumferential dimension of the axial covering portion 28 larger than the circumferential dimension of the support 2 in this way, a large design surface formed by the axially outer surface of the axial covering portion 28 is ensured.

[0053] In this example, the circumferential dimension of the axial covering portion 28 is made larger than the circumferential dimensions of the radial covering portion 29 and the inner body portion 20 respectively. For this purpose, at both outer circumferential ends of the axial covering portion 28, there are provided substantially triangular plate-shaped wing portions 30 that protrude outward in the circumferential direction from the radial covering portion 29 and the inner body portion 20.

[0054] As shown in FIG. 15, the axial covering portion 28 has a flat reference surface 31 on its axially inner surface. The axial covering portion 28 has a protruding portion 32 that protrudes axially inward from the reference surface 31 at the circumferential middle portion of the axially inner surface. The protruding portion 32 is provided substantially entirely on the portion of the axially inner surface of the axial covering portion 28 that axially faces a later-described substrate portion 46b that constitutes the outer pad 5. For this reason, the protruding portion 32 has a shape that substantially matches the substrate portion 46b of the outer pad 5. An abutting convex portion 33 that bulges axially inward is provided on the axially inner surface (tip surface) of the protruding portion 32. In the illustrated example, the abutting convex portion 33 has a substantially lattice shape. The abutting convex portion 33 abuts against the axially outer surface (back surface) of the substrate portion 46b of the outer pad 5 during braking.

[0055] The axial covering portion 28 has a pair of relief recesses 34 that are recessed axially outward from the reference surface 31 at both circumferential outer sides of the protruding portion 32 on the axially inner surface. The relief recesses 34 are provided on the portion of the axially inner surface of the axial covering portion 28 that axially faces a pair of outer guide portions 14 that constitute the support 2 and the vicinity thereof. Specifically, the relief recesses 34 are provided on the portion that axially faces the outer guide portion 14 and the portion that axially faces the portion located closer to the circumferential inner side than the outer guide portion 14.

[0056] Each of the relief recesses 34 has a deep recess 34a at the circumferential inner portion, and a shallow recess 34b that is shallower in axial depth than the deep recess 34a is provided outside the deep recess 34a in the circumferential direction.

[0057] Inside the escape recess 34, when the wear of the inner pad 4 and the outer pad 5 progresses and the caliper body 3 moves axially inward with respect to the support 2, the outer axial portion of the outer guide portion 14 and the axial outer portions of the pad clips 7a and 7b attached to the circumferentially inner surface of the outer guide portion 14 can enter respectively. Specifically, inside the shallow recess 34b, the outer axial portion of the outer guide portion 14 can enter, and inside the deep recess 34a, the axial outer portions of the pad clips 7a and 7b can enter. With such a configuration, interference between the pair of outer guide portions 14 and the pad clips 7a and 7b and the outer body portion 21 is prevented.

[0058] In particular, the pad clips 7a and 7b used in this example have a configuration in which the curled portion 57 protrudes significantly axially outward compared to the other portions of the pad clips 7a and 7b, as will be described later. Therefore, in this example, in order to prevent interference between the bottom surface of the deep recess 34a and the curled portion 57, instead of increasing the axial depth of the entire deep recess 34a, a through hole 35 that allows only the curled portion 57 to be inserted is formed in the axial covering portion 28. Thereby, a decrease in the rigidity of the outer body portion 21 is suppressed compared to the case where the axial depth of the entire deep recess 34a is increased.

[0059] In this example, the through hole 35 that opens only axially is formed in the axial covering portion 28 at a portion that axially opposes the vicinity of each of the pair of outer guide portions 14 that constitute the support 2. Specifically, the through hole 35 is opened only on the axially outer surface and the axially inner surface of the axial covering portion 28, and is not opened in other portions (for example, the radially covering portion 29). Also, the through hole 35 is formed in the axial covering portion 28 at a portion that axially opposes the internal space of the outer side guide groove 17 located near the circumferentially inner side of the outer guide portion 14. In this example, two through holes 35 are formed in the axial covering portion 28.

[0060] The opening on the axially inner side of the through-hole 35 is located at the radially inner part of the bottom surface of the deep recess 34a. The through-hole 35 can be machined, for example, by cutting (drilling) using a cutting tool such as a drill.

[0061] As shown in Fig. 18, on the inner side of the through-hole 35, when braking, the axially outer part of the curl part 57, which is the part that protrudes most axially among the pad clips 7a and 7b, is inserted. The through-hole 35 has a shape and size that can insert the curl part 57 with almost no gap. Therefore, it is possible to suppress a decrease in the rigidity of the caliper body 3 due to the formation of the through-hole 35.

[0062] The central axis of the through-hole 35 is arranged parallel to the central axis of the rotor 8. The cross-sectional shape of the through-hole 35 is constant in the axial direction. In the illustrated example, the through-hole 35 has a substantially pentagonal or substantially trapezoidal cross-sectional shape (opening shape). When implementing the present invention, the central axis of the through-hole can also be inclined with respect to the central axis of the rotor, and the cross-sectional shape (opening shape) of the through-hole can also be made into other shapes such as circular, elliptical, or quadrangular.

[0063] The circumferential dimension of the through-hole 35 is slightly larger than the radial dimension. Therefore, even when the circumferential interval between the pair of pad clips 7a and 7b (curl parts 57) changes by changing the circumferential dimension of the outer pad 5 to be used, the through-hole 35 can be used as it is without changing its shape.

[0064] In addition, when implementing the present invention, if there are a plurality of portions of the pad clip that protrude significantly outward in the axial direction compared to other portions, only one through-hole into which these portions can be inserted together can be formed, or a plurality of through-holes into which these portions can be inserted one by one can be formed. Further, even when the inner pad and the outer pad are fully worn, if interference between the outer axial surface of the outer guide portion and the inner axial surface of the axial covering portion can be prevented, the shallow recess can be omitted from the relief recess. Also, if interference between a portion of the pad clip other than a portion that protrudes significantly outward in the axial direction, such as the curled portion, and the inner axial surface of the axial covering portion can be prevented, the deep recess can be omitted from the relief recess, that is, the relief recess itself can be omitted, and only the through-hole can be formed.

[0065] The axial covering portion 28 has, on its outer axial surface, first concave grooves 36 that connect to the outer axial opening of the through-hole 35. Each of the first concave grooves 36 extends in the circumferential direction, and the inner circumferential end thereof connects to the outer axial opening of the through-hole 35. For this reason, the axial covering portion 28 has two first concave grooves 36. The first concave groove 36 corresponds to the concave groove described in the claims.

[0066] The width dimension of the first concave groove 36 is substantially constant over the entire length of the first concave groove 36 and is substantially the same as the radial dimension at the outer axial opening of the through-hole 35. In this example, the first concave groove 36 is provided so as to connect to the outer axial opening of the through-hole 35, and the width dimension of the first concave groove 36 is made substantially the same as the radial dimension at the outer axial opening of the through-hole 35. For this reason, the through-hole 35 and the first concave groove 36 can be smoothly continuous, and the outer axial opening of the through-hole 35 can be made less conspicuous from the outside. Also, the design property can be enhanced by incorporating the outer axial opening of the through-hole 35 as part of the design of the design surface.

[0067] Each of the first concave grooves 36 has a curved portion 36a that is substantially arcuately curved such that the radially outer side is convex on the circumferentially inner side, and has a linear straight portion 36b on the circumferentially outer side. The straight portion 36b extends in a direction toward the radially inner side as it goes toward the circumferentially outer side so as to follow the contour shape of the outer peripheral edge of the axial covering portion 28. And the end portion on the circumferentially outer side of the first concave groove 36 (straight portion 36b) opens to a substantially linear radially inner surface corresponding to the chord of the axial covering portion 28.

[0068] The bottom surface 36c of the first concave groove 36 is not a flat surface, but a convex curved surface that is arcuately curved. Specifically, the bottom surface 36c of the first concave groove 36 is a convex curved surface that is arcuately curved such that the middle portion in the width direction protrudes axially outward more than the both side portions in the width direction.

[0069] The axial covering portion 28 has a second concave groove 37 on the axially outer surface that connects the axially outer openings of the through holes 35. The second concave groove 37 extends in the circumferential direction and is curved such that the radially outer side is convex. The width dimension of the second concave groove 37 is substantially constant over the entire length of the second concave groove 37 and is substantially the same as the radial dimension at the axially outer opening of the through hole 35. For this reason, the pair of first concave grooves 36 arranged on both circumferentially outer sides are smoothly continuous in the circumferential direction via the pair of through holes 35 and the second concave groove 37.

[0070] The axial covering portion 28 includes an annular fan-shaped display portion 38 that can be used to display a logo or the like at the circumferential middle portion of the axially outer surface. The display portion 38 is configured in a flat surface shape and is arranged radially outside the pair of through holes 35 and the second concave groove 37. In this example, since the circumferential dimension of the axial covering portion 28 is made larger than the circumferential dimension of the support 2, the circumferential dimension of the display portion 38 can also be made sufficiently large. Since the display portion 38 is surrounded by groove portions 39 on both circumferentially outer sides and the radially outer side, it floats axially outward and is visually recognized.

[0071] The radial covering portion 29 has a partial cylindrical shape and extends inward in the axial direction from the outer peripheral edge of the axial covering portion 28. The radial covering portion 29 covers, from the outside in the radial direction, a pair of guide portions 9 that constitute the support 2, a part of the circumferential direction of the rotor 8, and each of the inner and outer pads 4 and 5. The circumferential dimension of the radial covering portion 29 is the same as the circumferential dimension of the inner body portion 20.

[0072] The radial covering portion 29 has mounting holes (threaded holes) 40 for fixing the tip ends of the connecting members 22a and 22b at a plurality of locations in the circumferential direction (four locations in the illustrated example). The plurality of mounting holes 40 are arranged at the same pitch in the circumferential direction as a plurality of insertion holes provided in the inner body portion 20. The mounting holes 40 open on the inner axial surface of the radial covering portion 29.

[0073] The radial covering portion 29 has a central window 41 that opens on both sides in the radial direction at the inner portion in the axial direction of the central portion in the circumferential direction. The central window 41 has an axially elongated slit shape. The central window 41 also opens on the inner axial surface of the radial covering portion 29. The central window 41 can be used to visually confirm the wear conditions of the inner pad 4 and the outer pad 5.

[0074] The outer body portion 21 composed of the axial covering portion 28 and the radial covering portion 29 is fixed to the outside in the axial direction of the inner body portion 20 using the connecting members 22a and 22b, each of which is a bolt. Specifically, the tip end of the connecting member 22a inserted axially through the insertion hole provided in the circumferential arm portion 24 of the inner body portion 20 is screwed into the mounting hole 40 provided in the outer circumferential portion in the circumferential direction of the radial covering portion 29 of the outer body portion 21, and the tip end of the connecting member 22b inserted axially through the insertion hole provided in the radially protruding portion 25 of the inner body portion 20 is screwed into the mounting hole 40 provided in the inner circumferential portion in the circumferential direction of the radial covering portion 29 of the outer body portion 21. Thereby, the outer body portion 21 is connected to the outside in the axial direction of the inner body portion 20 using the connecting members 22a and 22b.

[0075] With the inner body part 20 and the outer body part 21 connected, a pair of openings 42 are formed between the axially outer surface of the inner body part 20 and the axially inner surface of the outer body part 21. The pair of openings 42 are spaced apart from each other in the circumferential direction and are arranged on both outer sides in the circumferential direction of the pair of radially protruding parts 25. Each of the openings 42 is configured to be substantially rectangular in a radial view. In the assembled state of the disc brake device 1, the axially inner part of the caliper guide part 15 constituting the support 2 is exposed from the opening 42.

[0076] The caliper body 3 is supported so as to be movable axially with respect to the support 2. For this purpose, the base end part of the slide pin 19 is fixed to the fixing hole 26 provided in the circumferential intermediate part of the circumferential arm part 24 constituting the inner body part 20, and the tip part of the slide pin 19 is inserted into the inside of the support hole 65 formed in the caliper guide part 15 constituting the support 2 so as to be relatively displaceable (slidable) axially. Further, a part of the outer peripheral surface of the slide pin 19, which is located between the support hole 65 and the fixing hole 26, is covered with a boot 43.

[0077] 〈Inner Pad and Outer Pad〉 As shown in FIG. 20, the inner pad 4 includes a lining 44a and a back plate 45a, and is supported between a pair of inner guide parts 13 constituting the support 2 so as to be movable axially.

[0078] The back plate 45a has a rectangular plate-shaped substrate part 46a that supports the back surface (axially inner surface) of the lining 44a, and convex ear parts 47a that respectively protrude from the substrate part 46a toward both outer sides in the circumferential direction. The substrate part 46a has a shape that substantially matches the lining 44a.

[0079] In order to support the inner pad 4 so as to be axially movable with respect to the pair of inner guide parts 13, the ear parts 47a constituting the inner pad 4 are engaged with the inner side guide concave grooves 16 provided in the inner guide parts 13 with concavo-convex.

[0080] The outer pad 5 includes a lining 44b and a back plate 45b, and is supported between a pair of outer guide portions 14 that constitute the support 2 so as to be movable axially.

[0081] The back plate 45b has a rectangular plate-shaped substrate portion 46b that supports the back surface of the lining 44b, and convex ear portions 47b that project outward in the circumferential direction from both outer sides of the substrate portion 46b. The substrate portion 46b has a shape that substantially matches the lining 44b.

[0082] In order to support the outer pad 5 so as to be axially movable with respect to the pair of outer guide portions 14, the ear portions 47b that constitute the outer pad 5 are engaged with the outer side guide grooves 17 provided in the outer guide portions 14 in a concave-convex manner.

[0083] 〈Pad Clip〉 Pad clips 6a and 6b are interposed between the outer circumferential surfaces on both sides in the circumferential direction of the back plate 45a that constitutes the inner pad 4 and the inner circumferential surfaces of the pair of inner guide portions 13, respectively. Also, pad clips 7a and 7b are interposed between the outer circumferential surfaces on both sides in the circumferential direction of the back plate 45b that constitutes the outer pad 5 and the inner circumferential surfaces of the pair of outer guide portions 14, respectively. This enables smooth axial movement of the inner pad 4 and the outer pad 5. Note that the pad clips 7a and 7b arranged on the outer side in the axial direction correspond to the pad clips described in the claims.

[0084] As shown in FIGS. 20 and 21, a return spring 48 that biases the inner pad 4 and the outer pad 5 in a direction away from the rotor 8 when the braking force is released is attached to each of the pad clips 6a, 6b, 7a, and 7b.

[0085] Of the four pad clips 6a, 6b, 7a, and 7b, a pair of pad clips 6a and 7a arranged on the incoming side (the right side in FIG. 17) and a pair of pad clips 6b and 7b arranged on the outgoing side (the left side in FIG. 17) each have an axially symmetric shape. Also, a pair of pad clips 6a and 6b arranged opposite to each other in the circumferential direction and a pair of pad clips 7a and 7b arranged opposite to each other in the circumferential direction each have a circumferentially symmetric shape. For this reason, a detailed description of the pad clips 6a, 6b, 7a, and 7b will be given only for the pad clip 7b arranged on the outer side in the axial direction and on the outgoing side, and a detailed description of the other pad clips 6a, 6b, and 7a will be omitted.

[0086] As shown in FIGS. 22 to 24, the pad clip 7b is made by pressing a metal plate having elasticity and corrosion resistance such as a stainless steel plate, and includes a clamping portion 49, a guide plate portion 50, a radial pressing portion 51, a circumferential pressing portion 52, a spring holding portion 53, and a restraining portion 54.

[0087] The clamping portion 49 is configured to have a substantially U-shaped cross section and is provided at the radial intermediate portion of the pad clip 7b. The clamping portion 49 elastically clamps the protrusion 18 provided on the inner circumferential surface of the outer guide portion 14 from both sides in the radial direction to position the pad clip 7b in the radial direction. At both axial ends of the clamping portion 49, a pair of claw pieces 55a and 55b bent outward in the circumferential direction are provided. The pair of claw pieces 55a and 55b elastically clamp the protrusion 18 from both sides in the axial direction to position the pad clip 7b in the axial direction.

[0088] The guide plate portion 50 is configured in a flat plate shape and is provided at the inner radial portion of the pad clip 7b. The guide plate portion 50 is arranged along the bottom surface (inner circumferential surface) of the outer guide groove 17. Then, it is arranged (clamped) between the bottom surface of the outer guide groove 17 and the front end surface (outer circumferential surface) of the ear portion 47b of the outer pad 5.

[0089] The radial pressing portion 51 is configured in a horizontal V shape and is provided at the radially inner end of the pad clip 7b. The radial pressing portion 51 includes a flat pressing substrate portion 56 that bends substantially at a right angle from the radially inner end of the guide plate portion 50 toward the circumferentially inner side, a substantially cylindrical curled portion 57 that is folded back 180 degrees from the axially outer end of the pressing substrate portion 56 toward the radially outer side and axially inner side (rotor 8 side), and a flat pressing body portion 58 that extends in a direction toward the radially outer side as it goes from the curled portion 57 toward the axially inner side in a free state.

[0090] When the pressing body portion 58 engages the ear portion 47b constituting the outer pad 5 with the outer side guide groove 17 in a concave-convex manner, it is disposed on the radially inner side of the ear portion 47b. Then, based on the bending deformation of the curled portion 57, the ear portion 47b is pressed radially outward.

[0091] The circumferential pressing portion 52 is configured in an inverted U shape and is provided at the radially outer portion of the pad clip 7b. By bending and deforming, the circumferential pressing portion 52 elastically presses the circumferentially outer surface of the radially outer portion (the portion radially outer than the ear portion 47b) of the back plate 45b constituting the outer pad 5 toward the circumferentially inner side (the retracting side).

[0092] The spring holding portion 53 is configured in a tongue shape and is provided at the radially outer portion of the pad clip 7b. The spring holding portion 53 is provided so as to extend outward in the circumferential direction from the clamping portion 49 and has a function of holding the return spring 48.

[0093] The restraining portion 54 is configured in an inverted J shape and is provided at the radially outer end of the pad clip 7b. The restraining portion 54 is provided in a state continuous with the circumferential pressing portion 52 and is provided to enable the return spring 48 to be attached to the pad clip 7b (to form an assembly of the pad clip 7b and the return spring 48) in a state before the outer pad 5 is assembled. It supports the elastic force (return force) of the return spring 48 and restrains the return spring 48.

[0094] With the pad clip 7b as described above attached to the circumferential inner surface of the outer guide portion 14, the axially outer portion of the pad clip 7b (the axially outer portion of the guide plate portion 50, the curled portion 57, the restraining portion 54) protrudes axially outward from the outer guide portion 14. In particular, the curled portion 57 protrudes significantly axially outward compared to the other parts of the pad clip 7b and is arranged to protrude most axially outward from the outer guide portion 14.

[0095] Therefore, in this example, when the wear of the inner pad 4 and the outer pad 5 progresses and the caliper body 3 moves axially inward with respect to the support 2, during braking, the curled portion 57 constituting the pad clip 7b is likely to interfere with the axially covering portion 28 constituting the outer body portion 21. In this example, among the axially covering portions 28, a through hole 35 is provided in the portion axially opposed to the inner space of the outer guide concave groove 17, and since the curled portion 57 can be inserted inside the through hole 35, interference between the curled portion 57 and the axially covering portion 28 can be prevented.

[0096] 〈Return spring〉 A return spring 48 is attached to the pad clip 7b (6a, 6b, 7a) of this example.

[0097] The return spring 48 is a torsion coil spring formed by bending a wire rod made of spring steel such as stainless steel or piano wire, and includes a coil portion 59, and locking arm portions 60 and spring arm portions 61 arranged on both axial sides with the coil portion 59 interposed therebetween.

[0098] The coil portion 59 is held by the spring holding portion 53 of the pad clip 7b with the central axis directed in the circumferential direction.

[0099] The locking arm portion 60 is arranged on the axially inner side (rotor 8 side) of the coil portion 59, and the tip portion is locked to the circumferential pressing portion 52.

[0100] The spring arm portion 61 is disposed on the outer side in the axial direction of the coil portion 59 (on the side opposite to the rotor 8), and is configured in a substantially U shape when viewed in the circumferential direction. The tip of the spring arm portion 61 abuts against the inner surface in the axial direction of the ear portion 47b of the outer pad 5, and presses the outer pad 5 outward in the axial direction (on the side opposite to the rotor 8).

[0101] The return spring 48, in a state of being attached to the pad clip 7b, has most of it disposed on the outer side in the circumferential direction (the back side) of the pad clip 7b except for a part of the spring arm portion 61, and is configured so as not to protrude greatly in the axial direction and the radial direction as well as in the circumferential direction from the pad clip 7b.

[0102] [Explanation of the operation of the disc brake device] To perform braking by the disc brake device 1 of this example, pressure oil is sent from the master cylinder into the cylinder 23 of the caliper body 3. As a result, a piston (not shown) is pushed outward in the axial direction. Then, the inner pad 4 is pressed against the inner surface in the axial direction of the rotor 8 by the piston, and the caliper body 3 is moved inward in the axial direction with respect to the support 2. As a result, the contact convex portion 33 of the overhanging portion 32 provided in the axially covering portion 28 constituting the caliper body 3 is pressed against the back surface of the back plate 45b constituting the outer pad 5. As a result, the outer pad 5 is pressed against the outer surface in the axial direction of the rotor 8. As a result, the rotor 8 is strongly clamped from both sides in the axial direction by the inner pad 4 and the outer pad 5, and braking is performed.

[0103] When releasing the braking, the pressure oil is discharged from the cylinder 23 of the caliper body 3. As a result, by the elastic restoring force of a piston seal (not shown) externally fitted to the piston, the piston is pulled back (rolled back) to the inner side (axial inner side) of the cylinder 23, and a clearance between the inner pad 4 and the inner surface in the axial direction of the rotor 8 is secured. As a result, the caliper body 3 moves slightly outward in the axial direction with respect to the support 2, and a clearance is also secured between the outer pad 5 and the outer surface in the axial direction of the rotor 8.

[0104] According to the disk brake device 1 of this example as described above, even when a large design surface formed by the axially outer surface of the axial covering portion 28 is ensured, interference between the outer guide portion 14 of the support 2, the pad clips 7a and 7b attached to the outer guide portion 14, and the axial covering portion 28 of the caliper body 3 can be prevented.

[0105] In this example, in order to ensure a large design surface formed by the axially outer surface of the axial covering portion 28, the circumferential dimension of the axial covering portion 28 is made larger than the circumferential dimension of the support 2, and the pair of guide portions 9 are covered from the axially outer side by the axial covering portion 28. Further, the pad clips 7a and 7b are attached to the circumferentially inner surfaces of the pair of outer guide portions 14, and the curled portions 57 of the pad clips 7a and 7b are arranged to protrude largely axially outside the outer guide portion 14. For this reason, when the wear of the inner pad 4 and the outer pad 5 progresses and the caliper body 3 moves axially inward with respect to the support 2, the curled portion 57 and the axial covering portion 28 are likely to interfere with each other during braking. Therefore, in this example, a through hole 35 is formed in a portion of the axial covering portion 28 that axially faces the inner space of the outer side guide groove 17 so that the curled portion 57 is inserted inside the through hole 35. Therefore, interference between the curled portion 57 and the axial covering portion 28 can be prevented.

[0106] Further, the through hole 35 is opened only on the axially outer surface and the axially inner surface of the axial covering portion 28, and is not opened in other portions (for example, the radial covering portion 29). For this reason, a decrease in the rigidity of the caliper body 3 due to the formation of the through hole 35 can be suppressed. Also, heat of the engaging portion between the ear portion 47b of the outer pad 5 and the outer side guide groove 17 can be dissipated through the through hole 35, and the engaging portion can be cooled. Furthermore, by forming the through hole 35, the weight of the caliper body 3 can be reduced.

[0107] In addition, since the shape and size of the through hole 35 are regulated to be such that the curled portions 57 of the pad clips 7a and 7b can be inserted with substantially no gap, it is possible to minimize a decrease in the rigidity of the caliper body 3 due to the formation of the through hole 35.

[0108] Furthermore, in this example, relief recesses 34 are formed in portions of the axially inner surface of the axial covering portion 28 that axially face the outer guide portion 14 and its vicinity, respectively. For this reason, when wear of the inner pad 4 and the outer pad 5 progresses and the caliper body 3 moves axially inward with respect to the support 2, the axially outer portion of the outer guide portion 14, the axially outer portions of the pad clips 7a and 7b (the axially outer portion of the guide plate portion 50, the restraining portion 54), and the axially outer portion of the return spring 48 (the axially outer portion of the spring arm portion 61) can enter the inside of the relief recesses 34, respectively. Therefore, it is also possible to prevent interference between the axially outer portion of the outer guide portion 14, the axially outer portions of the pad clips 7a and 7b (the axially outer portion of the guide plate portion 50, the restraining portion 54), the axially outer portion of the return spring 48 (the axially outer portion of the spring arm portion 61), and the axial covering portion 28.

[0109] Also, a first concave groove 36 is provided on the axially outer surface of the axial covering portion 28 so as to connect to the axially outer opening of the through hole 35, and the width dimension of the first concave groove 36 is made substantially the same as the radial dimension at the axially outer opening of the through hole 35. Therefore, the through hole 35 and the first concave groove 36 can be smoothly continuous, and the axially outer opening of the through hole 35 can be made inconspicuous from the outside. Also, the axially outer opening of the through hole 35 can be incorporated as part of the design of the design surface to enhance the design property.

[0110] [Second Example of Embodiment] The second example of the embodiment will be described with reference to FIGS. 25 to 27.

[0111] In this example, only the structure of the outer body portion 21a constituting the caliper body 3 is changed from the structure of the first example of the embodiment.

[0112] That is, a through hole 35a with a cross-sectional shape that changes according to the axial position is formed in the axial covering portion 28a that constitutes the outer body portion 21a. In the through hole 35a of this example, the inner surface on the circumferentially inner side that constitutes the inner surface is inclined in a direction that goes toward the circumferentially inner side as it goes toward the axially outer side. The cross-sectional area (opening area) of the through hole 35a increases as it goes toward the axially outer side. The opening at the axially inner side of the through hole 35a has a substantially rhombic shape, whereas the opening at the axially outer side has a substantially trapezoidal shape or a substantially parallelogram shape.

[0113] The axial covering portion 28a has a second concave groove 37a on the axially outer surface that connects the openings on the axially outer sides of the pair of through holes 35a in the circumferential direction, but does not have a first concave groove that extends from the opening on the axially outer side of the through hole 35a toward the circumferentially outer side.

[0114] The axial covering portion 28a has a pair of design concave portions 62 that are recessed toward the axially inner side at both circumferentially outer portions of the axially outer surface. Each of the design concave portions 62 has a substantially fan shape.

[0115] The axial covering portion 28a has relief recesses 34, each of which is a deep recess 34a, at both circumferentially outer portions of the overhanging portion 32 on the axially inner surface. Inside the relief recesses 34, when the wear of the inner pad 4 and the outer pad 5 progresses and the caliper body 3 moves axially inward with respect to the support 2, the axially outer portions of the pad clips 7a, 7b enter. That is, in the case of this example, even when the shallow recesses are omitted from the axially inner surface of the axial covering portion 28a, interference between the axially outer surface of the outer guide portion 14 and the axially inner surface (reference surface 31) of the axial covering portion 28a can be prevented in a state where the inner pad 4 and the outer pad 5 are fully worn.

[0116] The radial covering portion 29a that constitutes the outer body portion 21a does not have a central window that opens on both radial sides at the circumferential center of the outer peripheral surface, and has a central concave portion 63 with a concave curved surface that is recessed toward the radially inner side.

[0117] In the case of this example as described above, since the inner surface on the circumferential direction inner side that constitutes the inner surface of the through hole 35a is inclined in a direction that goes toward the circumferential direction inner side as it goes toward the axial direction outer side, the continuity between the through hole 35a and the second concave groove 37a can be enhanced, and the design property can be enhanced. Regarding other configurations and operational effects, they are the same as those in the first example of the embodiment.

[0118] [Third Example of the Embodiment] The third example of the embodiment will be described with reference to FIGS. 28 to 30.

[0119] In this example, only the structure of the outer body portion 21b that constitutes the caliper body 3 is changed from the structure of the first example of the embodiment.

[0120] That is, a through hole 35b having a constant cross-sectional shape in the axial direction is formed in the axial covering portion 28b that constitutes the outer body portion 21b. The through hole 35b is a rectangular hole having a rectangular (substantially square) cross-sectional shape.

[0121] The axial covering portion 28b does not have either a first concave groove or a second concave groove that connects to the axial direction outer side openings of the pair of through holes 35b on the axial direction outer surface.

[0122] The axial covering portion 28b is provided with a plurality (four in the illustrated example) of design convex portions 64a to 64d on both outer sides in the circumferential direction with the display portion 38 interposed therebetween. The axial direction outer surfaces (tip surfaces) of the design convex portions 64a to 64d are flat surfaces and are arranged on the same virtual plane as the display portion 38. The axial direction outer side openings of the through hole 35b are surrounded by the display portion 38 and the plurality of design convex portions 64a to 64c. Each of the design convex portions 64a to 64d has a substantially square shape.

[0123] The radial covering portion 29b that constitutes the outer body portion 21b does not have a central window that opens on both sides in the radial direction at the circumferential center of the outer peripheral surface, and has a rectangular concave central concave portion 63a that is recessed toward the radial direction inner side.

[0124] In the case of this example as described above, by surrounding the opening on the outer axial direction side of the through hole 35b with the display portion 38 and the plurality of design convex portions 64a to 64c, it is possible to make it inconspicuous from the outside. Regarding other configurations and functions and effects, they are the same as those of the first example of the embodiment.

[0125] [Fourth Example of Embodiment] The fourth example of the embodiment will be described with reference to FIGS. 31 to 33.

[0126] In this example, only the structure of the outer body portion 21c that constitutes the caliper body 3 is changed from the structure of the first example of the embodiment.

[0127] The axial covering portion 28c that constitutes the outer body portion 21c has a through hole 35b in the shape of a rectangular hole (substantially square) in cross section, similar to the structure of the third example of the embodiment.

[0128] The axial covering portion 28c has a pair of first concave grooves 36 on the outer axial direction surface that connect to the openings on the outer axial direction side of the pair of through holes 35b. The first concave grooves 36 are composed only of straight portions 36b that extend linearly in the circumferential direction, and are formed so as to cross the through hole 35b in the circumferential direction.

[0129] The outer circumferential ends of the first concave grooves 36 (straight portions 36b) open to a cylindrical outer radial surface (outer circumferential surface) corresponding to the arc of the axial covering portion 28c. Also, the inner circumferential ends of the first concave grooves 36 (straight portions 36b) reach the vicinity of the central portion in the circumferential direction of the outer axial direction surface of the axial covering portion 28c. The inner circumferential ends of the pair of first concave grooves 36 are not connected to each other and are separated in the circumferential direction. The inner circumferential portion of the first concave groove 36 has a tapered shape with a smaller width dimension toward the inner circumferential direction.

[0130] The bottom surface 36c of the first concave groove 36 is not a flat surface but a concave curved surface that is curved in an arc shape. Specifically, the bottom surface 36c of the first concave groove 36 is a concave curved surface that is curved in an arc shape such that the middle portion in the width direction is recessed axially inward more than the both side portions in the width direction.

[0131] The axial covering portion 28c includes an elliptical display portion 38a that can be used to display a logo or the like at a radially outer portion of the circumferential intermediate portion of the axially outer surface.

[0132] Similar to the structure of the second example of the embodiment, the axial covering portion 28c has relief recesses 34 each formed by a deep recess 34a at both circumferentially outer portions of the overhanging portion 32 on the axially inner surface. Inside the relief recesses 34, when the wear of the inner pad 4 and the outer pad 5 progresses and the caliper body 3 moves axially inward with respect to the support 2, the axially outer portions of the pad clips 7a and 7b enter.

[0133] The radially covering portion 29a constituting the outer body portion 21c has a central concave portion 63 in a concave curved surface shape recessed radially inward at the circumferential center of the outer peripheral surface.

[0134] In the case of this example as described above, since the axial covering portion 28c is provided with a linear first concave groove 36 so as to cross the axially outer opening of the through hole 35b in the circumferential direction, the axially outer opening of the through hole 35b can be made inconspicuous from the outside. Regarding other configurations and effects, they are the same as those of the first example and the second example of the embodiment.

[0135] [Fifth Example of the Embodiment] The fifth example of the embodiment will be described with reference to FIGS. 34 to 37.

[0136] In this example, only the structure of the outer body portion 21d constituting the caliper body 3 is changed from the structure of the first example of the embodiment.

[0137] That is, a through hole 35d with a cross-sectional shape that changes according to the axial position is formed in the axial covering portion 28d that constitutes the outer body portion 21d. In the illustrated example, the through hole 35d is a tapered rectangular hole, and the cross-sectional area becomes smaller toward the outer side in the axial direction. Thereby, the opening on the outer side in the axial direction of the through hole 35d is made small. When implementing the present invention, the central axis of the through hole can also be inclined with respect to the central axis of the rotor.

[0138] The axial covering portion 28d does not have either a first concave groove or a second concave groove that connects to the openings on the outer side in the axial direction of the pair of through holes 35d on the outer surface in the axial direction. The axial covering portion 28d includes an elliptical display portion 38a that can be used to display a logo or the like on the radially outer portion of the circumferential intermediate portion of the outer surface in the axial direction.

[0139] The axial covering portion 28d does not have relief recesses on both outer sides in the circumferential direction of the overhanging portion 32 on the inner surface in the axial direction. That is, in the case of this example, even when the relief recesses are omitted from the inner surface in the axial direction of the axial covering portion 28d, interference between the outer surface in the axial direction of the outer guide portion 14 and the inner surface in the axial direction of the axial covering portion 28d (reference surface 31) can be prevented in a state where the inner pad 4 and the outer pad 5 are fully worn, and interference between portions other than the curled portions 57 of the pad clips 7a and 7b and the inner surface in the axial direction of the axial covering portion 28d (reference surface 31) can be prevented.

[0140] The radially covering portion 29a that constitutes the outer body portion 21d has a concave curved surface-shaped central recess 63 that is recessed radially inward at the central portion in the circumferential direction of the outer peripheral surface.

[0141] In the case of this example as described above, since the through hole 35d is a tapered rectangular hole with a cross-sectional area that becomes smaller toward the outer side in the axial direction, even when elastic deformation occurs in the axial covering portion 28d during braking, interference between the through hole 35d and the curled portion 57 can be suppressed. Also, since the opening on the outer side in the axial direction of the through hole 35d can be made small, the opening can be made inconspicuous from the outside. For other configurations and effects, they are the same as those in the first example of the embodiment.

[0142] As described above, the embodiments of the present invention have been explained. However, the present invention is not limited thereto and can be appropriately modified without departing from the technical idea of the invention. Also, the structures of each example of the embodiment can be implemented in appropriate combination as long as there is no contradiction.

[0143] In the structure of each example of the embodiment, a configuration is adopted in which a pad clip is attached to the outer guide portion constituting the support, and the curl portion constituting the pad clip is arranged to protrude most axially outward from the outer guide portion. Therefore, a through hole into which the curl portion can be inserted is formed in the axially covering portion constituting the caliper body. However, when implementing the present invention, what is inserted into the through hole formed in the axially covering portion is not limited to the curl portion, and the portion arranged most axially outward among the pad clips can be targeted. For this reason, the formation position and size of the through hole can be changed according to the shape of the pad clip used. Furthermore, when adopting a configuration in which a pad clip is not attached to the outer guide portion constituting the support, a part or all of the outer guide portion can be inserted inside the through hole formed in the axially covering portion. In this case, the formation position and size of the through hole can be changed according to the shape of the outer guide portion.

Explanation of Reference Numerals

[0144] 1 Disc brake device 2 Support 3 Caliper body 4 Inner pad 5 Outer pad 6a, 6b Pad clip 7a, 7b Pad clip 8 Rotor 9 Guide portion 10 Inner circumferential direction connecting portion 11 Outer circumferential direction connecting portion 12 Mounting hole 13 Inner guide part 14 Outer guide part 15 Caliper guide part 16 Inner side guide concave groove 17 Outer side guide concave groove 18 Protrusion 19 Slide pin 20 Inner body part 21, 21a, 21b, 21c, 21d Outer body part 22a, 22b Connecting member 23 Cylinder 24 Circumferential direction arm part 25 Radial direction protruding part 26 Fixing hole 27 Band-shaped rib 28, 28a, 28b, 28c, 28d Axial direction covering part 29, 29a, 29b Radial direction covering part 30 Wing part 31 Reference plane 32 Protruding part 33 Contact convex part 34 Relief concave part 34a Deep concave part 34b Shallow concave part 35, 35a, 35b, 35c, 35d Through hole 36 First concave groove 36a Curved part 36b Straight part 36c Bottom surface 37 Second concave groove 38, 38a Display part 39 Groove part 40 Mounting hole 41 Central window 42 Opening part 43 Boot 44a, 44b Lining 45a, 45b Back plate 46a, 46b Substrate part 47a, 47b Ear part 48 Return spring 49 Clamping part 50 Guide plate part 51 Radial direction pressing part 52 Circumferential direction pressing part 53 Spring holding part 54 Restraining part 55a, 55b Claw pieces 56 Pressing substrate part 57 Curling part 58 Pressing body part 59 Coil part 60 Locking arm part 61 Spring arm part 62 Design recess 63, 63a Central recess 64a - 64d Design protrusions 65 Support hole 100 Disk brake device 101 Support 102 Caliper body 103 Inner pad 104 Outer pad 105 Rotor 106 Guide part 107 Circumferential connecting part 108 Inner guide part 109 Outer guide part 110 Caliper guide part 111 Support hole 112 Outer body part 113 Inner body part 114 Cylinder 115 Piston 116 Slide pin

Claims

1. An inner pad disposed on the inner side in the axial direction of the rotor, an outer pad disposed on the outer side in the axial direction of the rotor, a support fixed to the vehicle body and supporting each of the inner pad and the outer pad so as to be axially movable, a caliper body supported so as to be axially movable with respect to the support, and comprising: the support has, on each of both outer circumferential portions, an inner guide portion for axially movably supporting the inner pad and an outer guide portion for axially movably supporting the outer pad, the caliper body has a cylinder and has an inner body portion disposed axially inside the rotor and an outer body portion for pressing the outer pad during braking, the outer body portion has a through hole that opens only in the axial direction at a portion axially opposed to the outer guide portion or / and a vicinity portion of the outer guide portion, A floating type disc brake device.

2. further comprising a pad clip disposed between the outer pad and the outer guide portion, a part of the pad clip is inserted inside the through hole, The floating type disc brake device according to claim 1.

3. The through hole has a shape and size into which a part of the pad clip can be inserted with substantially no gap, and the floating type disc brake device according to claim 2.

4. the outer pad has convex ear portions protruding in the circumferential direction, the outer guide portion has guide concave grooves engageable with the ear portions, the through hole is provided at a portion axially opposed to the internal space of the guide concave grooves, The floating type disc brake device according to any one of claims 1 to 3.

5. The through hole has a circumferential dimension larger than a radial dimension, and the floating type disc brake device according to any one of claims 1 to 4.

6. The through hole has a substantially polygonal opening shape in an axial view, and the floating type disc brake device according to any one of claims 1 to 5.

7. The cross-sectional shape of the through hole changes according to the axial position, and the floating type disc brake device according to any one of claims 1 to 6.

8. The circumferential dimension of the outer body part is larger than the circumferential dimension of the support. The floating disk brake device according to any one of claims 1 to 7.

9. On the axially outer surface of the outer body part, a concave groove connected to the opening of the through hole is provided. The floating disk brake device according to any one of claims 1 to 8.

10. The concave groove extends in the circumferential direction. The floating disk brake device according to claim 9.

11. The outer body part has a substantially arcuate shape when viewed axially. The concave groove opens to the radially inner surface or the radially outer surface of the outer body part. The floating disk brake device according to claim 10.

12. The bottom surface of the concave groove is a convex curved surface that is arcuately curved such that the middle part in the width direction protrudes axially outward more than the both side parts in the width direction. The floating disk brake device according to any one of claims 9 to 11.

13. The bottom surface of the concave groove is a concave curved surface that is arcuately curved such that the middle part in the width direction is recessed axially inward more than the both side parts in the width direction. The floating disk brake device according to any one of claims 9 to 11.

14. The central axis of the through hole and the central axis of the rotor are parallel to each other. The floating disk brake device according to any one of claims 1 to 13.

15. The outer body part has two through holes. The floating disk brake device according to any one of claims 1 to 14.

Images