Caliper body of a vehicle disc brake

Abstract

This caliper body for a vehicle disc brake has improved stiffness due to reinforcing ribs while suppressing an increase in weight. A pair of first reinforcing ribs 28, 28 extending out to a disc turn-out side from a cylinder part side are provided to a disc radially outer side and a disc radially inner side of an anti-disc rotor side surface 21h of a turn-out side body part 21g of the caliper body 3. A pair of second reinforcing ribs 29, 29 extending out to a disc turn-in side from the cylinder part side are provided to the disc radially outer side and the disc radially inner side of the anti-disc rotor side surface 21h of a turn-in side body part 21j. A first thinned portion 21i serving as a thin-walled portion is provided to the anti-disc rotor side surface 21h between the pair of first reinforcing ribs 28, 28, and a second thinned portion 21k serving as a thin-walled portion is provided to the anti-disc rotor side surface 21h between the pair of second reinforcing ribs 29, 29.

Description

Technical Field

[0001] The present invention relates to a caliper body of a vehicle disc brake, and more particularly to a caliper body of a vehicle disc brake provided with reinforcing ribs.

Background Art

[0002] Conventionally, in a vehicle disc brake, when hydraulic pressure is supplied to a hydraulic chamber formed between a cylinder hole and a piston during braking, in order to suppress the bottom wall of the cylinder hole from bulging toward the side of the counter disc rotor, there has been a caliper body provided with reinforcing ribs (see, for example, Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the inventions of Patent Documents 1 and 2 described above, the reinforcing ribs are formed by overlaying on the caliper body, and although the rigidity of the caliper body can be ensured, the weight is increased.

[0005] Therefore, an object of the present invention is to provide a caliper body of a vehicle disc brake that can improve the rigidity of the caliper body with reinforcing ribs while suppressing an increase in weight.

Means for Solving the Problems

[0006] To achieve the above objective, the caliper body for a vehicle disc brake of the present invention is provided straddling the outer circumference of a disc rotor, and having an operating part with a cylinder part into which a piston is inserted on the side of the disc rotor, wherein the operating part comprises an outlet side body portion extending from the cylinder part toward the disc outlet side when the vehicle is moving forward, and an entry side body portion extending from the cylinder part toward the disc entry side when the vehicle is moving forward, wherein a pair of disc outlet side reinforcing ribs extending from the cylinder part side toward the disc outlet side are provided on the outer and inner sides in the radial direction of the disc on the side surface of the outlet side body portion opposite to the disc rotor, and a pair of disc entry side reinforcing ribs extending from the cylinder part side toward the disc entry side are provided on the outer and inner sides in the radial direction of the disc on the side surface of the entry side body portion opposite to the disc rotor, and thin-walled portions are provided on the side surface opposite to the disc rotor between the pair of disc outlet side reinforcing ribs and on the side surface opposite to the disc rotor between the pair of disc entry side reinforcing ribs.

[0007] Furthermore, it is preferable that the disc return side reinforcing rib and the disc return side reinforcing rib are formed continuously with the cylinder portion, and that the side of the disc return side reinforcing rib opposite the disc rotor and the side of the disc return side reinforcing rib opposite the disc rotor are on the same plane as the side of the cylinder portion opposite the disc rotor, or are formed on the side of the cylinder portion opposite the disc rotor.

[0008] Furthermore, the caliper body is preferably formed by connecting a pair of the operating parts, which are located on both sides of the disc rotor, with a bridge portion that spans the outer circumference of the disc rotor.

[0009] Furthermore, it is preferable that the outlet-side body portion and the entry-side body portion of the operating portion are provided with vehicle body mounting portions, and that these vehicle body mounting portions are equipped with bolt insertion holes in the radial direction of the disc through which vehicle body mounting bolts are inserted.

[0010] Furthermore, it is preferable that the operating portion is provided with a vehicle body mounting portion, and that the vehicle body mounting portion has a bolt insertion hole in the disc axial direction through which a vehicle body mounting bolt is inserted. [Effects of the Invention]

[0011] According to the caliper body for a vehicle disc brake of the present invention, a pair of disc return-side reinforcing ribs extending from the cylinder side to the disc return side are formed on the outer and inner sides in the disc radial direction of the disc on the side surface opposite the disc rotor of the return-side body portion, and a pair of disc entry-side reinforcing ribs extending from the cylinder side to the disc entry side are formed on the outer and inner sides in the disc radial direction of the disc on the side surface opposite the disc rotor of the entry-side body portion. This improves the rigidity of the caliper body and suppresses the cylinder portion from bulging toward the side opposite the disc rotor during braking. Furthermore, by forming thin-walled portions on the side surface opposite the disc rotor between the pair of disc return-side reinforcing ribs and on the side surface opposite the disc rotor between the pair of disc entry-side reinforcing ribs, the weight of the caliper body can be suppressed.

[0012] Furthermore, the disc exit side reinforcing rib and the disc entry side reinforcing rib are formed continuously on the cylinder portion, and the side of the disc exit side reinforcing rib opposite the disc rotor and the side of the disc entry side reinforcing rib opposite the disc rotor are formed on the same plane as the side of the cylinder portion opposite the disc rotor, or on the side of the cylinder portion opposite the disc rotor, thereby ensuring rigidity while reducing weight without increasing the size of the caliper body.

[0013] Furthermore, the caliper body is formed by connecting a pair of working parts located on both sides of the disc rotor with a bridge portion that spans the outer circumference of the disc rotor. This allows for improved rigidity while suppressing the weight increase of a split-type caliper body with opposing pistons.

[0014] Furthermore, a vehicle mounting portion is provided on the extending-side body portion and the retracting-side body portion of the acting portion. The vehicle mounting portion is provided with a bolt insertion hole in the disk radial direction for inserting a vehicle mounting bolt, thereby suppressing an increase in the weight of the radial mount type caliper body while improving rigidity.

[0015] In addition, a vehicle mounting portion is provided on the acting portion. The vehicle mounting portion is provided with a bolt insertion hole in the disk axial direction for inserting a vehicle mounting bolt, thereby suppressing an increase in the weight of the axial mount type caliper body while improving rigidity.

Brief Description of the Drawings

[0016] [Figure 1] It is a front view of a vehicle disk brake showing an exemplary embodiment of the present invention. [Figure 2] It is also a rear view of the vehicle disk brake. [Figure 3] It is also a plan view of the vehicle disk brake. [Figure 4] It is also a side view of the vehicle disk brake. [Figure 5] It is a cross-sectional view taken along the line V-V of FIG. 4. [Figure 6] It is a cross-sectional view taken along the line VI-VI of FIG. 1. [Figure 7] It is a cross-sectional view taken along the line VII-VII of FIG. 1. [Figure 8] It is an explanatory view when assembling the friction pad and the pad spring to the caliper body. [Figure 9] It is a perspective view of the pad spring.

Embodiments for Carrying Out the Invention

[0017] FIGS. 1 to 9 are diagrams showing an exemplary embodiment of the vehicle disk brake of the present invention. Arrow A indicates the rotation direction of the disk rotor that rotates integrally with the wheel when the vehicle moves forward. The disk extending side and the disk retracting side described below refer to those when the vehicle moves forward.

[0018] The vehicle disc brake 1 includes a disc rotor 2 that rotates integrally with a wheel (not shown) in the direction of arrow A, a caliper body 3 attached to the vehicle body on one side of the disc rotor 2, and a pair of friction pads 5, 5 disposed inside the caliper body 3 so as to face each other with the disc rotor 2 interposed therebetween and suspended by a hanger pin 4. A pad spring 6 for suppressing the play of the friction pads 5, 5 abuts against the friction pads 5, 5. <​​​​​​​​​The caliper half 21 on the opposite side of the vehicle body has hydraulic chambers 23, 23 defined between the bottom of the cylinder bores 22, 22 and the pistons 8, 8 into which working fluid is introduced. Furthermore, a first working fluid introduction hole 24 is drilled from the disc exit side of the dividing surface 21e, which is the joint surface of the bridge half 21c, toward the hydraulic chamber 23 on the disc exit side. A part of the bottom of the cylinder bore 22 on the disc exit side has a first contouring section 25a that connects the hydraulic chamber 23 on the disc exit side and the first working fluid introduction hole 24 by contouring, and a second contouring section 25b that contours toward the hydraulic chamber 23 on the disc entry side. Furthermore, a third contouring section 25c is formed in a part of the bottom of the cylinder hole 22 on the disc entry side, and contouring is performed toward the second contouring section 25b. By connecting the second contouring section 25b and the third contouring section 25c, the first working fluid introduction hole 24, the hydraulic chamber 23 on the disc exit side, and the hydraulic chamber 23 on the disc entry side are connected.

[0022] Furthermore, the disc ejection side of the bridge section half 21c is provided with a union hole 26 that opens to the disc ejection side surface 21f of the bridge section half 21c and the first working fluid introduction hole 24. The union hole 26 has a female threaded portion 26a formed on the opening side for screwing in a union bolt (not shown). In addition, radial mount type vehicle mounting portions 27, 27 are formed on the disc insertion side and disc ejection side of the caliper half 21 opposite the vehicle body. Mounting bolt insertion holes 27a, 27a in the radial direction of the disc are formed in the vehicle mounting portions 27, 27, and the caliper body 3 is attached to the vehicle body by screwing mounting bolts inserted through these mounting bolt insertion holes 27a, 27a into the caliper mounting portions provided on the vehicle body side. Furthermore, large diameter flange portions 27b, 27b for reinforcement are formed at the outer end and inner end in the radial direction of the disc, respectively, of each vehicle mounting portion 27.

[0023] Furthermore, the working portion 21b of the caliper half 21 on the side opposite the vehicle body comprises cylinder portions 21a, 21a having cylinder holes 22, 22, a discharge-side body portion 21g extending from the cylinder portion 21a on the disc discharge side to the disc discharge side, and a re-entry-side body portion 21j extending from the cylinder portion 21a on the disc re-entry side to the disc re-entry side. A pair of first reinforcing ribs 28, 28 (disc discharge-side reinforcing ribs of the present invention) are provided on the outer and inner sides in the disc radial direction of the disc radially of the side surface 21h of the discharge-side body portion 21g opposite the disc rotor, and the first reinforcing rib 28 on the outer side in the disc radial direction connects the cylinder portion 21a on the disc discharge side to the large-diameter flange portion 27b on the outer side in the disc radial direction of the vehicle body mounting portion 27 on the disc discharge side. Furthermore, the first reinforcing rib 28 on the radially inward side of the disc connects the cylinder portion 21a on the disc rotation side with the large-diameter flange portion 27b on the radially inward side of the vehicle body mounting portion 27 on the disc rotation side. In addition, a first weight-reducing portion 21i, which is a thin-walled portion, is formed by casting on the side 21h opposite the disc rotor between the first reinforcing ribs 28, 28.

[0024] Furthermore, a pair of second reinforcing ribs 29, 29 (disk entry side reinforcing ribs of the present invention) are provided on the outer and inner sides in the disk radial direction of the disk side of the anti-disk rotor side surface 21h of the entry side body portion 21j. The second reinforcing rib 29 on the outer side in the disk radial direction connects the cylinder portion 21a on the disk entry side with the large-diameter flange portion 27b on the outer side in the disk radial direction of the vehicle body mounting portion 27 on the disk entry side. The second reinforcing rib 29 on the inner side in the disk radial direction connects the cylinder portion 21a on the disk entry side with the large-diameter flange portion 27b on the inner side in the disk radial direction of the vehicle body mounting portion 27 on the disk entry side. In addition, a second weight-reducing portion 21k, which is a thin-walled portion, is formed by casting on the anti-disk rotor side surface 21h between the second reinforcing ribs 29, 29.

[0025] Furthermore, as shown in Figures 1 and 6, the outer surface (opposite the disc rotor side) OS1 of each first reinforcing rib 28 is formed to gradually incline toward the disc rotor side toward the disc rotation side, compared to the outer surface OS2 (opposite the disc rotor side) of the cylinder portion 21a. Similarly, the outer surface (opposite the disc rotor side) OS3 of each second reinforcing rib 29 is also formed to gradually incline toward the disc rotor side toward the disc entry side, compared to the outer surface OS2 (opposite the disc rotor side) of the cylinder portion 21a.

[0026] Furthermore, a mounting boss portion 30 is formed at the center of the circumferential direction of the disk on the radially outer surface of the working portion 21b, and is equipped with a pin insertion hole 30a through which the hanger pin 4 is inserted.

[0027] The caliper half 31 on the vehicle body side has hydraulic chambers 33, 33 defined between the bottom of the cylinder bores 32, 32 and the pistons 8, 8 into which working fluid is introduced. A second working fluid inlet hole 34 is drilled from the disc exit side of the dividing surface 31e, which is the joint surface of the bridge half 31c, toward the hydraulic chamber 33 on the disc exit side, and the first working fluid inlet hole 24 and the second working fluid inlet hole 34 are in communication at the dividing surfaces 21e, 31e. A part of the bottom of the cylinder bore 32 on the disc exit side has a fourth contouring section 35a that connects the hydraulic chamber 33 on the disc exit side and the second working fluid inlet hole 34 by contouring, and a fifth contouring section 35b that contours toward the hydraulic chamber 33 on the disc entry side. Furthermore, a sixth contouring section 35c is formed in a part of the bottom of the cylinder hole 32 on the disc entry side, and contouring is performed toward the fifth contouring section 35b. By connecting the fifth contouring section 35b and the sixth contouring section 35c, the second working fluid introduction hole 34, the hydraulic chamber 33 on the disc exit side, and the hydraulic chamber 33 on the disc entry side are connected.

[0028] Furthermore, the disc discharge side of the bridge portion half 31c is provided with a bleeder portion 37 having a bleeder hole 36 that opens to the radially outer surface 31f of the disc and to the second working fluid introduction hole 34.

[0029] The bleeder hole 36 has a female threaded portion 36a formed on the opening side into which the bleeder screw 39 is screwed. The bleeder screw 39 has an air discharge hole (not shown) on its inner circumference and a male threaded portion 39a on its outer circumference that screws into the female threaded portion 36a. A rubber bleeder cap 40 is attached to the tip of the screw.

[0030] Furthermore, the working portion 31b of the caliper half 31 on the vehicle body side comprises cylinder portions 31a, 31a having cylinder holes 32, 32, a discharge-side body portion 31g extending from the cylinder portion 31a on the disc discharge side to the disc discharge side, and a re-entry-side body portion 31j extending from the cylinder portion 31a on the disc re-entry side to the disc re-entry side. A pair of third reinforcing ribs 41, 41 (disc discharge-side reinforcing ribs of the present invention) are provided on the outer and inner sides in the disc radial direction of the disc radial side of the side surface 31h of the discharge-side body portion 31g opposite the disc rotor. The third reinforcing rib 41 on the outer side in the disc radial direction connects the cylinder portion 31a on the disc discharge side to the disc discharge-side end of the discharge-side body portion 31g. The third reinforcing rib 41 on the inner side in the disc radial direction connects the cylinder portion 31a on the disc discharge side to the disc discharge side of the third reinforcing rib 41 on the outer side in the disc radial direction. Furthermore, a third weight-reducing portion 31i, which is a thin-walled portion, is formed by casting on the side surface 31h opposite the disc rotor between the third reinforcing ribs 41, 41.

[0031] Furthermore, a pair of fourth reinforcing ribs 42, 42 (disk entry side reinforcing ribs of the present invention) are provided on the outer and inner sides in the disk radial direction of the disk side surface 31h of the entry side body portion 31j. The fourth reinforcing rib 42 on the outer side in the disk radial direction connects the cylinder portion 31a on the disk entry side and the disk entry side end of the entry side body portion 31j. The fourth reinforcing rib 42 on the inner side in the disk radial direction connects the cylinder portion 31a on the disk entry side and the disk rotor entry side of the fourth reinforcing rib 42 on the outer side in the disk radial direction. In addition, a fourth weight-reducing portion 31k, which is a thin-walled portion, is formed by casting on the disk rotor side surface 31h between the fourth reinforcing ribs 42, 42.

[0032] Furthermore, as shown in Figures 2 and 6, the outer surface (opposite the disc rotor side) OS4 of each third reinforcing rib 41 is formed to be gradually inclined toward the disc rotor side toward the disc rotation side, compared to the outer surface OS5 (opposite the disc rotor side) of the cylinder portion 31a. Similarly, the outer surface (opposite the disc rotor side) OS6 of each fourth reinforcing rib 42 is also formed to be gradually inclined toward the disc rotor side toward the disc entry side, compared to the outer surface OS5 (opposite the disc rotor side) of the cylinder portion 31a.

[0033] Furthermore, a mounting boss portion 43 is formed on the outer surface of the working portion 31b in the circumferential direction of the disc, with a pin insertion hole 43a for inserting a hanger pin 4, facing the mounting boss portion 30 of the caliper half 21 on the side opposite the vehicle body.

[0034] The caliper body 3 is formed by joining the anti-vehicle-side caliper half 21 and the vehicle-side caliper half 31, which are formed in this manner, at the bridge portion 3a, with the divided surfaces 21e, 31e abutting against each other, and connecting them with connecting bolts 7, 7. Furthermore, by connecting the anti-vehicle-side caliper half 21 and the vehicle-side caliper half 31, the first hydraulic fluid inlet hole 24 and the second hydraulic fluid inlet hole 34 are connected, and consequently, the first hydraulic fluid inlet hole 24, the second hydraulic fluid inlet hole 34, and the hydraulic pressure chambers 23 of the anti-vehicle-side caliper half 21 and the hydraulic pressure chambers 33 of the vehicle-side caliper half 31 are connected, forming a hydraulic passage L1. In addition, since the union hole 26 is connected to the first hydraulic fluid inlet hole 24, hydraulic fluid is supplied to the hydraulic passage L1 via the union hole 26. Furthermore, since the bleeder hole 36 is in communication with the second working fluid inlet hole 34, air mixed in with the working fluid introduced into the fluid passage L1 is discharged to the outside via the bleeder screw 39.

[0035] Furthermore, friction pad housing sections 9 for housing the friction pads 5 are formed in the discharge-side body sections 21g, 31g and the re-entry-side body sections 21j, 31j. The disc discharge-side wall 9a of the friction pad housing section 9 formed in the discharge-side body sections 21g, 31g and the disc re-entry-side wall 9b of the friction pad housing section 9 formed in the re-entry-side body sections 21j, 31j are torque receiving sections that contact the friction pads 5, 5 and receive torque during braking. In addition, a locking groove 9c for locking the pad spring 6 is formed in the disc re-entry-side wall 9b.

[0036] Each friction pad 5 consists of a lining 5a that slides against the side surface of the disc rotor 2 and a metal backing plate 5b to which the lining 5a is attached. The backing plate 5b has a suspension piece 5e protruding from the center of the outer surface 5c in the radial direction of the disc, which has a hanger pin insertion hole 5d through which a hanger pin 4 is inserted. Adjacent to the disc rotation side and disc entry side of the suspension piece 5e, a pair of first pad spring contact portions 5f, 5f are provided, which the pad spring 6 contacts. Furthermore, a pair of second pad spring contact portions 5g, 5g are provided protruding from the disc rotation side end and the disc entry side end of the outer surface 5c in the radial direction of the disc. The suspension piece 5e, the first pad spring contact portions 5f, 5f, and the second pad spring contact portions 5g, 5g are arranged in parallel in the circumferential direction of the disc on the outer surface 5c in the radial direction of the disc.

[0037] The hanger pins 4 are inserted through the pin insertion holes 30a and 43a of the mounting bosses 30 and 43, respectively, and are mounted in the disc axial direction through the ceiling opening 3b of the caliper body 3. They are also inserted through the hanger pin insertion holes 5d and 5d of the suspension pieces 5e and 5e provided on the friction pads 5, suspending the friction pads 5, 5 so that they can move in the disc axial direction while housed in the friction pad housing 9. In addition, a pad spring 6 is provided across the back plate 5b and the hanger pins 4, pressing the friction pads 5, 5 inward in the disc radial direction and on the disc rotation side.

[0038] The pad spring 6 is formed by bending a single sheet of material that has been punched into a predetermined shape, and includes an arc-shaped hanger pin contact portion 6a that abuts against the outer peripheral surface of the hanger pin 4 on the inner side in the radial direction of the disc, a first resilient portion 6c that extends from the hanger pin contact portion 6a via a strip-shaped first spring piece 6b towards the disc entry side and abuts against the first pad spring contact portion 5f and the second pad spring contact portion 5g on the disc entry side of the friction pads 5, 5, and a second resilient portion 6e that extends from the hanger pin contact portion 6a via a strip-shaped second spring piece 6d towards the disc exit side and abuts against the second pad spring contact portion 5g on the disc exit side of the friction pads 5, 5.

[0039] The first spring portion 6c includes a first spring piece 6f that contacts the first pad spring contact portion 5f on the disc rotation side of the friction pad 5, causing the friction pads 5, 5 to spring inward in the radial direction of the disc and outward from the disc rotor, first positioning pieces 6g, 6g and second positioning pieces 6h, 6h that contact the friction pads 5, 5 and pad spring 6 when assembling the friction pads 5, 5 and pad spring 6 to the caliper body 3 to position the pad spring 6, and a locking piece 6i that is locked into the locking groove 9c.

[0040] The first positioning pieces 6g,6g and the second positioning pieces 6h,6h are formed by cutting and bending a portion of the first resilient piece 6f in an arc shape in the radial direction of the disc. As shown in Figure 8, when assembling the friction pads 5,5 and the pad spring 6 to the caliper body 3, the first positioning pieces 6g,6g are inserted into the recesses 5h,5h (spaces) formed between the suspension pieces 5e,5e and the first pad spring contact portions 5f,5f on the disc entry side. That is, the first positioning pieces 6g,6g are housed in the recesses 5h,5h, with their tips contacting the disc entry sides 5i,5i of the first pad spring contact portions 5f,5f, while the second positioning pieces 6h,6h contact the outer surface 5c in the radial direction of the disc of the backing plate 5b near the second pad spring contact portions 5g,5g on the disc entry side.

[0041] Furthermore, the locking piece 6i protrudes toward the disk rotation side from the central part of the disk rotation side end of the first spring piece 6f, and its tip 6j is inserted into the locking groove 9c. In addition, the first spring piece 6f is formed to be wide in the disk rotation direction, and its end faces 6k, 6k on the side opposite the disk rotor abut against the wall portions 3c, 3c of the ceiling opening 3b, respectively.

[0042] The second spring portion 6e is formed by bending the disc rotation side outward in an arc shape in the radial direction of the disc, and the bent portion 6m is brought into contact with the disc rotation side surfaces 5j, 5j of the second pad spring contact portions 5g, 5g on the disc rotation side. Furthermore, the second spring portion 6e is formed to be wide in the disc axial direction, and the end faces 6n, 6n (second restraint portion of the present invention) on the side opposite the disc rotor are in contact with the wall portions 3c, 3c of the ceiling opening 3b. The wall portions 3c, 3c on the side opposite the disc rotor of the ceiling opening 3b, which the end faces 6k, 6k, 6n, 6n are in contact with, are each formed with a cast surface. In addition, the outer surface 9d in the radial direction of the disc of the locking groove 9c is formed further outward in the radial direction of the disc than the accommodating groove 3e of the disc rotor 2 formed on the disc rotor side surface of the bridge portion 3a.

[0043] The assembly of the friction pads 5,5 and pad spring 6 formed in this manner to the caliper body 3 is as follows: First, as shown in Figure 8, the friction pads 5,5 are placed in the friction pad housing 9, and the pad spring 6 is placed on the radially outer side of the friction pads 5,5 in the disc direction, and the tip 6j of the locking piece 6i is locked into the locking groove 9c.

[0044] At this time, the first positioning pieces 6g, 6g are inserted into the recesses 5h, 5h formed between the suspension pieces 5e, 5e and the first pad spring contact portions 5f, 5f on the disc entry side, with their tips in contact with the disc entry sides 5i, 5i of the first pad spring contact portions 5f, 5f, and the second positioning pieces 6h, 6h are in contact with the radially outer surfaces 5c, 5c of the disc near the second pad spring contact portions 5g, 5g on the disc entry side, so that the pad spring 6 is positioned relative to the friction pads 5, 5.

[0045] Next, the hanger pin 4 is inserted through the pin insertion hole 30a of the mounting boss portion 30 of the caliper half 21 on the side opposite the vehicle body, the 43a of the mounting boss portion 43 of the caliper half 31 on the vehicle body, and the hanger pin insertion holes 5d, 5d of the suspension pieces 5e, 5e provided on the friction pads 5, 5, thereby suspending the friction pads 5, 5 so that they can move in the disc axial direction. Furthermore, the outer peripheral surface of the hanger pin 4 on the inner side in the disc radial direction and the hanger pin contact portion 6a of the pad spring 6 come into contact and press against the pad spring 6, thereby positioning the pad spring 6 in the correct position as shown in Figure 5.

[0046] The pad spring 6, positioned in the correct location, contacts the outer peripheral surface of the hanger pin 4 on the inner side in the disc radial direction with the hanger pin contact portion 6a of the pad spring 6, and the tip portion 6j of the locking piece 6i is locked into the locking groove 9c. The first spring piece 6f of the first spring portion 6c contacts the outer surfaces 5k, 5k in the disc radial direction of the first pad spring contact portions 5f, 5f on the disc entry side of the friction pads 5, 5. Since the outer surfaces 5k, 5k in the disc radial direction are formed to gradually incline toward the disc rotor side from the disc exit side toward the disc entry side, the first pad spring contact portions 5f, 5f spring the friction pads 5, 5 inward in the disc radial direction and toward the disc exit side. The second spring-launching section 6e has a bent section 6m that contacts the disc-returning side surfaces 5j, 5j of the second pad spring contact sections 5g, 5g on the disc-returning side of the friction pads 5, 5, causing the friction pads 5, 5 to spring inward in the disc radial direction and towards the disc-returning side. Furthermore, the end faces 6k, 6k, 6n, 6n contact the wall sections 3c, 3c on the side of the ceiling opening 3b opposite the disc rotor.

[0047] As described above, the caliper body 3 of this embodiment is provided with first reinforcing ribs 28, 28, second reinforcing ribs 29, 29, third reinforcing ribs 41, 41, and fourth reinforcing ribs 42, 42, and between each reinforcing rib, there are first, second, third, and fourth weight-reducing sections 21i, 21k, 31i, and 31k, which are thin-walled sections. This makes it possible to reduce the weight of the caliper body 3 as much as possible, suppressing an increase in weight, while improving the rigidity of the caliper body 3 and suppressing the bulging of the cylinder sections 21a and 31a toward the opposite side of the disc rotor during braking.

[0048] Furthermore, the outer surface OS1 of the first reinforcing rib 28 is formed to be gradually inclined toward the disc rotor side toward the disc exit side compared to the outer surface OS2 of the cylinder portion 21a, the outer surface OS3 of the second reinforcing rib 29 is formed to be gradually inclined toward the disc rotor side toward the disc entry side compared to the outer surface OS2 of the cylinder portion 21a, the outer surface OS4 of the third reinforcing rib 41 is formed to be gradually inclined toward the disc rotor side toward the disc exit side compared to the outer surface OS5 of the cylinder portion 31a, and the outer surface OS6 of the fourth reinforcing rib 42 is formed to be gradually inclined toward the disc rotor side toward the disc entry side compared to the outer surface OS5 of the cylinder portion 31a. As a result, rigidity can be ensured while reducing weight without increasing the size of the caliper body 3.

[0049] Furthermore, the present invention is not limited to applications to split-type caliper bodies, but can also be applied to monocoque-type caliper bodies. In addition, the side of the reinforcing rib formed on the caliper body opposite the disc rotor may be formed on the same plane as the side of the cylinder portion opposite the disc rotor. Furthermore, the number of pistons and the configuration of the fluid passages are arbitrary. In addition, an axial-mount type caliper body with mounting bolt insertion holes in the disc axial direction at the vehicle body mounting portion is also acceptable. Moreover, the present invention is not limited to applications to piston-opposed type disc brake caliper bodies as in this embodiment, but can also be applied to pin-slide type disc brake caliper bodies in which an action part with pistons and a reaction part with reaction claws are provided on both sides of the disc rotor. [Explanation of Symbols]

[0050] 1...Vehicle disc brake, 2...Disc rotor, 3...Caliper body, 3a...Bridge section, 3b...Ceiling opening, 3c,3d...Wall section, 3e...Housing groove, 4...Hanger pin, 5...Friction pad, 5a...Lining, 5b...Backing plate, 5c...Disc radial outer surface, 5d...Hanger pin insertion hole, 5e...Suspension piece, 5f...First pad spring contact section, 5g...Second pad spring contact section, 5h...Recess, 5i...Disc rotation side, 5j...Disc entry side, 5k...Disc radial outer surface, 6...Pad spring, 6a...Hanger pin contact section, 6b...First spring piece, 6c...First spring section, 6d...Second spring piece, 6e...Second spring section, 6f...First spring piece, 6g...First positioning piece, 6h...Second positioning piece, 6i...Locking piece, 6j...Tip section, 6m...Bent section, 6k,6n...end face, 7...connecting bolt, 8...piston, 9...friction pad housing, 9a...disc rotation side wall, 9b...disc entry side wall, 9c...locking groove, 21...caliper half opposite the vehicle body, 21a...cylinder part, 21b...acting part, 21c...bridge half, 21d...ceiling opening half, 21e...dividing surface, 21f...disc rotation side, 21g...return side body, 21h...side of the disc rotor opposite, 21i... 1st weight-reducing section, 21j...re-entry side body section, 21k...2nd weight-reducing section, 21m...disk radial outer surface, 22...cylinder hole, 23...hydraulic chamber, 24...1st working fluid inlet hole, 25a...1st contouring section, 25b...2nd contouring section, 25c...3rd contouring section, 26...union hole, 26a...female thread section, 27...vehicle body mounting section, 27a...mounting bolt insertion hole, 28...1st reinforcing rib, 29...Second reinforcing rib, 30...Mounting boss section, 30a...Pin insertion hole, 31...Vehicle side caliper half, 31a...Cylinder section, 31b...Operating section, 31c...Bridge section half, 31d...Ceiling opening half, 31e...Dividing surface, 31f...Disc radial outer surface, 31g...Returning side body section, 31h...Anti-disc rotor side, 31i...Third weight-reducing section, 31j...Returning side body section, 31k...Fourth weight-reducing section, 32... 33...Cylinder bore, 34...Hydraulic chamber, 35a...Second working fluid inlet, 35a...Fourth contouring section, 35b...Fifth contouring section, 35c...Sixth contouring section, 36...Bleeder hole, 36a...Female thread section, 37...Bleeder section, 39...Bleeder screw, 39a...Male thread section, 40...Bleeder cap, 41...Third reinforcing rib, 42...Fourth reinforcing rib, 43...Mounting boss section, 43a...Pin insertion hole,

Claims

1. In a caliper body for a vehicle disc brake, which is provided across the outer circumference of a disc rotor and has an operating part with a cylinder portion for inserting a piston on the side of the disc rotor, The operating part comprises a rotating-side body portion extending from the cylinder portion toward the disc rotation side when the vehicle moves forward, and a re-entering-side body portion extending from the cylinder portion toward the disc re-entering side when the vehicle moves forward. A pair of disc-return side reinforcing ribs extending from the cylinder side to the disc-return side are provided on the outer and inner sides in the radial direction of the disc on the side of the disc rotor opposite the return-side body portion. A pair of reinforcing ribs extending from the cylinder side to the disc entry side are provided on the outer and inner sides in the radial direction of the disc on the side of the disc rotor opposite the entry side body portion, Thin-walled portions are provided on the side of the disc rotor opposite to the pair of disc return-side reinforcing ribs and on the side of the disc rotor opposite to the pair of disc return-side reinforcing ribs, respectively. The ejection-side body portion and the re-entry-side body portion of the operating part are provided with vehicle body mounting portions, and the vehicle body mounting portions are equipped with bolt insertion holes in the radial direction of the disc through which vehicle body mounting bolts are inserted. Large-diameter flange portions for reinforcement are formed at the radially outer end and radially inner end of the vehicle body mounting portion, respectively. Of the pair of reinforcing ribs on the disc rotation side, the reinforcing rib on the radially outer side of the disc connects the cylinder portion and the large-diameter flange portion on the radially outer side of the disc, and the reinforcing rib on the radially inner side of the disc connects the cylinder portion and the large-diameter flange portion on the radially inner side of the disc. A caliper body for a vehicle disc brake, characterized in that, of the pair of disc entry-side reinforcing ribs, the reinforcing rib on the radially outer side of the disc connects the cylinder portion and the large-diameter flange portion on the radially outer side of the disc, and the reinforcing rib on the radially inner side of the disc connects the cylinder portion and the large-diameter flange portion on the radially inner side of the disc.

2. The caliper body for a vehicle disc brake according to Claim 1, characterized in that the side of the disc exit side reinforcing rib opposite the disc rotor and the side of the disc entry side reinforcing rib opposite the disc rotor are formed on the same plane as the side of the cylinder portion opposite the disc rotor, or are formed on the side of the cylinder portion opposite the disc rotor.

3. The caliper body for a vehicle disc brake according to claim 1 or 2 is characterized in that the caliper body is formed by connecting a pair of the operating parts, which are arranged on both sides of the disc rotor, with a bridge portion that straddles the outer circumference of the disc rotor.

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