Disc for a disc brake

Abstract

To provide a disk for a disk brake capable of preventing occurrence of knock-back due to falling of a rotor by using a regulation part composed of a small number of components, surely connecting the rotor and a hub, and facilitating assembly work of the rotor and the hub.SOLUTION: An annular rotor 2 having a plurality of projecting pieces 5 projecting toward an inner peripheral side on an 2a of an inner peripheral edge part, a hub 3 arranged on the inner peripheral side of the rotor 2 and having recessed parts 6 respectively receiving the projecting pieces 5 on an 3b of an outer peripheral edge part, and a regulating part 4 regulating movement in a rotor axial direction of the projecting pieces 5 stored in the recessed parts 6 and connecting the rotor 2 and the hub 3 are provided. The regulating part 4 is provided with a covering part side 4a for covering the projecting piece 5 received by the recessed part 6, a fixing part side 4b arranged on one side in the disk peripheral direction by sandwiching the projecting piece 5, and a first claw part side 3b arranged on the other side in the disk peripheral direction by sandwiching the projecting piece 5, and straddling an outer peripheral edge part side 4c of the hub 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a disc for a disc brake formed by connecting a rotor on which the disc brake is disposed and a hub that rotates integrally with a wheel. [Background technology]

[0002] Generally, as a disc for a disc brake used in a motorcycle or the like, a disc formed by connecting an annular rotor on which the disc brake is arranged and a hub that is arranged on the inner periphery of the rotor and rotates integrally with the wheel is widely used.

[0003] This type of disk has multiple protrusions that protrude toward the inner circumference on the inner edge of the rotor, and multiple recesses that accommodate each of the protrusions on the outer edge of the hub, and the rotor and hub are connected by regulating the movement of the protrusions accommodated in the recesses with a regulating section.

[0004] Conventionally, as shown in Figures 9 and 10, the regulating portion has been formed of a floating pin 51 attached to a pin insertion hole 50b formed at the tip of a protrusion 50a of a rotor 50, a washer 52 attached to the floating pin 51, and an E-ring 53 that prevents the washer 52 from coming loose.

[0005] The floating pin 51 has a large-diameter flange 51a at one end, and the protrusion 50a is accommodated in a recess 54a provided in the hub 54. By inserting the floating pin 51 into the pin insertion hole 50b, the flange 51a covers one side 50c of the protrusion 50a and one side 54b of the hub 54. Furthermore, a washer 52 inserted into the other end of the floating pin 51 covers the other side 50d of the protrusion 50a and the other side 54c of the hub 54. Next, an E-ring 53 is fitted into an attachment groove 50e provided on the other end of the floating pin 51 to prevent the washer 52 from coming off, thereby sandwiching and fixing the protrusion 50a and the hub 54 between the flange 51a and the washer 52, thereby connecting the rotor 50 and the hub 54.

[0006] Furthermore, the regulating portion is formed from a clip-shaped plate, and by inserting the regulating portion into the protrusion, the protrusion is accommodated in a recess, and the regulating portion is screwed to the hub, the movement of the protrusion in the rotor axial direction is restricted, thereby connecting the rotor and the hub (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] WO2007 / 074488 Summary of the Invention [Problem to be solved by the invention]

[0008] However, in the case where the restriction portion is made up of the floating pin 51, washer 52, and E-ring 53, as shown in Fig. 10, a clearance C1 is formed between the flange portion 51a and one side surface 50c of the protrusion 50a, a clearance C2 is formed between the other side surface 50d of the protrusion 50a and the washer 52, and a clearance C3 is formed between the mounting groove 50e and the E-ring 53. For this reason, if the clearance (C1+C2+C3) between the restriction portion and the protrusion 50a increases due to the accumulation of tolerances, the rotor 50 may fall when the vehicle body is shaken, and so-called knockback may occur, in which the friction pads and pistons of the disc brake are pushed back.

[0009] Furthermore, in the above-mentioned Patent Document 1, the restricting portion formed from a clip-shaped plate is inserted into each protrusion, and then the protrusion with the restricting portion inserted is accommodated in a recess, and the restricting portion is screwed to the hub, which makes assembling the rotor and hub a time-consuming process.

[0010] Therefore, the present invention aims to provide a disc for a disc brake that can prevent knockback caused by rotor tipping using a regulating part composed of a small number of parts, can reliably connect the rotor and hub, and can easily assemble the rotor and hub. [Means for solving the problem]

[0011] In order to achieve the above-mentioned object, the disc for a disc brake of the present invention is a disc for a disc brake comprising: an annular rotor having a plurality of protrusions on its inner peripheral edge that protrude toward the inner peripheral side; a hub arranged on the inner peripheral side of the rotor and having recesses on its outer peripheral edge that receive each of the protrusions; and a regulating portion that restricts the axial movement of the protrusions housed in the recesses, thereby connecting the rotor and the hub, wherein the regulating portion comprises a covering portion that covers the protrusions received in the recesses, a fixing portion that is provided on one side of the disc circumferentially, sandwiching the protrusions, and a first claw portion that is provided on the other side of the disc circumferentially, sandwiching the protrusions, and straddling the outer peripheral edge of the hub. [Effects of the Invention]

[0012] The disc for a disc brake of the present invention can reliably connect the rotor and the hub with a small number of parts. It also prevents knockback, in which the friction pads and piston of the disc brake are pushed back due to rotor tilt caused by tolerances in the rotor axial direction, and provides stable braking force. Furthermore, assembly can be easily performed from one direction, and the first claw portion can position the regulating portion and prevent rotation, improving assembly ease. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is an exploded perspective view of a rotor, a hub, and a restricting portion according to a first embodiment of the present invention; [Figure 2]1 is a front view of a main part of a disk showing a first embodiment of the present invention in a state where a regulating portion is attached at one location. [Figure 3] 1 is a perspective view of a main part of a disk showing a first embodiment of the present invention in a state where a regulating portion is attached at one location. [Figure 4] FIG. 6 is a cross-sectional view taken along line IV-IV of FIG. 5. [Figure 5] 1 is a front view of a disk showing a first embodiment of the present invention. [Figure 6] 1 is a rear view of a disk with a disk brake attached thereto, showing a first embodiment of the present invention. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 6. [Figure 8] FIG. 10 is a front view of the main part of a double disc according to a second embodiment of the present invention. [Figure 9] FIG. 10 is a cross-sectional view of a main part showing a conventional rotor, a hub, and a restricting portion. [Figure 10] FIG. 10 is an enlarged cross-sectional view of a main part showing a conventional rotor, a hub, and a restricting portion. DETAILED DESCRIPTION OF THE INVENTION

[0014] 1 to 7 are diagrams showing a first embodiment of a disc for a disc brake of the present invention. The disc 1 is formed by connecting, via a restricting portion 4, an annular rotor 2 on which a disc brake 10 is arranged, and a hub 3 that is arranged on the inner periphery of the rotor 2 and rotates integrally with a wheel (not shown).

[0015] The rotor 2 is made of a metal plate made of stainless steel, carbon steel, or the like, which has excellent heat resistance, and is provided with, for example, twelve protrusions 5 at equal intervals around the circumferential direction on the inner peripheral edge 2a, which protrude inward. Additionally, the rotor 2 is formed with a plurality of through holes 2b that penetrate through the plate in the thickness direction to reduce weight and facilitate cooling.

[0016] The hub 3 is made of a metal plate, such as an aluminum alloy, to reduce weight, and has a wheel mounting portion 3a in its center that is attached to the wheel, allowing it to rotate integrally with the wheel. The hub 3 has twelve recesses 6 formed in its outer peripheral edge 3b, each formed in a shape that corresponds to one of the protrusions 5. The recesses 6 are open to the outer peripheral edge 3b of the hub 3 and one side in the rotor axial direction, and are closed on the other side in the rotor axial direction by a wall 6a that is integral with the hub 3.

[0017] Furthermore, the protrusion 5 and the recess 6 are formed so that when the protrusion 5 is housed in the recess 6, one surface 5a of the protrusion 5 in the rotor axial direction and one surface 3c of the hub 3 in the rotor axial direction are flush with each other.

[0018] The restricting portion 4 integrally comprises a covering portion 4a large enough to cover one axial surface 5a of the protrusion 5 housed in the recess 6, a fixing portion 4b provided on one side in the disk circumferential direction with the protrusion 5 sandwiched therebetween, a first claw portion 4c provided on the other side in the disk circumferential direction with the protrusion 5 sandwiched therebetween and straddling the outer peripheral edge portion 3b of the hub 3, and a second claw portion 4d extending from the tip of the first claw portion 4c toward the center of the rotor 2. A bolt insertion hole 7 is formed in the fixing portion 4b, and a bolt 8 (the fastening member of the present invention) is inserted through the bolt insertion hole 7. Furthermore, a female screw hole 8a is formed in the hub 3 on one side in the disk circumferential direction of the recess 6, into which the bolt 8 is fastened.

[0019] To assemble the disk 1 formed as described above, first, the protrusions 5 of the rotor 2 are inserted into the recesses 6 of the hub 3 from one side in the rotor axial direction, and the protrusions 5 are accommodated in the recesses 6. This positions the hub 3 and the rotor 2. Next, the restriction portions 4 are attached to the surface 3c of the hub 3 on one side in the rotor axial direction with bolts 8.

[0020] Each restricting portion 4 is attached to the hub 3 by arranging the first claw portion 4c on the other circumferential side of the protrusion 5 across the outer peripheral edge portion 3b of the hub 3, and fastening a bolt 8 inserted through a bolt insertion hole 7 to the female screw hole 8a. As a result, the cover portion 4a covers the opening of the recess 6 that is open to one side in the rotor axial direction, i.e., covers the one surface 5a in the rotor axial direction of the protrusion 5 housed in the recess 6. Furthermore, the second claw portion 4d is arranged on the other surface 3d of the hub 3 in the rotor axial direction.

[0021] In this way, the cover portion 4a of each regulating portion 4 abuts against and covers one surface 5a of the protrusion 5 in the rotor axial direction, thereby restricting the axial movement of each protrusion 5 housed in each recess 6 by the wall 6a and the cover portion 4a. Furthermore, the circumferential movement of each protrusion 5 is also restricted by the hub radial side walls 6b, 6b of the recess 6, ensuring a reliable connection between the rotor 2 and the hub 3. The regulating portion 4 is positioned by the first claw portion 4c and the second claw portion 4d during installation. Furthermore, when the bolt 8 is rotated (in the direction of arrow R1 in FIG. 2 ) to tighten the regulating portion 4, the first claw portion 4c, which is located further forward in the rotation direction, abuts against the outer peripheral edge portion 3b of the hub 3, preventing the regulating portion 4 from rotating.

[0022] 5 to 7, a disc brake 10 is attached to the assembled disc 1. The disc brake 10 includes a caliper body 11 attached to the vehicle body on one side of the disc 1, and friction pads 12, 12 arranged on both sides of the rotor 2.

[0023] The caliper body 11 includes a pair of acting portions 11a and a bridge portion 11b connecting the pair of acting portions 11a across the rotor 2. Each acting portion 11a has cylinder holes 11c that are open toward the rotor 2 and are aligned in the circumferential direction of the rotor 2. A piston 13 is housed in each cylinder hole 11c via a piston seal 14 and a dust seal 18, and a hydraulic chamber 15 is defined between the cylinder hole 11c and the bottom side of the piston 13. The hydraulic chambers 15, 15 located above the vehicle body of each acting portion 11a are connected by a hydraulic communication hole (not shown), which is provided with a union hole 16 and a brewer 17. One acting portion 11a is also provided with a pair of vehicle body mounting portions 11d.

[0024] Each friction pad 12 consists of a lining 12a placed on the rotor 2 side and a backing plate 12b to which the lining 12a is attached. The hydraulic pressure supplied to the hydraulic chamber 15 causes the piston 13 to push the friction pad 12, causing the lining 12a to slide against the rotor 2, thereby braking the rotor.

[0025] Since the disk 1 of this embodiment is formed as described above, when assembling the disk 1, the rotor 2 and the hub 3 are positioned by fitting each protrusion 5 into each recess 6. Furthermore, the work of fitting the protrusion 5 into the recess 6 and the work of attaching the restriction portion 4 can be easily performed from one direction (one side in the rotor axial direction), improving the ease of assembling the rotor 2 and the hub 3.

[0026] Furthermore, the restriction portion 4 is attached only with bolts 8 and is configured with a small number of parts, which contributes to reducing the weight and cost of the disk 1. Furthermore, when attaching the restriction portion 4, the first claw portion 4c and the second claw portion 4d ensure positioning, and the first claw portion 4c prevents rotation, which improves assembly. Furthermore, the second claw portion 4d increases the load-bearing capacity of the restriction portion 4 in the rotor axial direction.

[0027] Furthermore, because the cover portion 4a covers the one surface 5a of the protrusion 5 in the rotor axial direction, even if the clearance due to tolerance formed between the one surface 5a of the protrusion 5 in the rotor axial direction and the cover portion 4a and the clearance due to tolerance formed between the other surface 5b of the protrusion 5 in the rotor axial direction and the wall 6a (FIG. 4) increases, it is possible to prevent the rotor 2 from tipping over when the vehicle body is shaken, etc. This makes it possible to prevent knockback, in which the friction pad 12 and piston 13 of the disc brake 10 are pushed back due to the rotor 2 tipping over, and to obtain a stable braking force.

[0028] FIG. 8 shows a second embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0029] The disc of this embodiment is used in a so-called double-disc brake device for a saddle-ride type vehicle. A disc 21 and a disc 22 are provided on each side of, for example, the front wheel of the saddle-ride type vehicle, and a disc brake (not shown) is attached to each of the discs 21 and 22.

[0030] Fig. 8(A) shows disc 21 attached to the left side of the wheel, and Fig. 8(B) shows disc 22 attached to the right side of the wheel. Discs 21 and 22 are each formed by connecting rotor 2 and hub 3 via restricting portion 23 or restricting portion 24. Arrow R3 indicates the direction of rotation of discs 21 and 22 when the vehicle is moving forward.

[0031] As shown in Figure 8(A), the regulating portion 23 of the disk 21 attached to the left side of the wheel is integrally provided with a covering portion 4a large enough to cover one rotor axial surface of the protrusion 5 housed in the recess, a fixing portion 4b provided in the disk rotation direction (one side of the disk circumferential direction) relative to the protrusion 5, and a first claw portion 4c provided in the disk rotation direction (the other side of the disk circumferential direction) relative to the protrusion 5 and spanning the outer periphery of the hub 3, and is attached to one rotor axial surface 3c of the hub 3 by a bolt 8.

[0032] As shown in Figure 8 (B), the regulating portion 24 of the disk 22 attached to the right side of the wheel is integrally provided with a covering portion 4a large enough to cover one rotor axial surface of the protrusion 5 housed in the recess, a fixing portion 4b provided in the disk rotation direction (the other side of the disk circumferential direction) relative to the protrusion 5, and a first claw portion 4c provided in the disk rotation direction (one side of the disk circumferential direction) relative to the protrusion 5 and spanning the outer periphery of the hub 3, and is attached to one rotor axial surface 3c of the hub 3 by a bolt 8.

[0033] As described above, in this embodiment, the discs 21 and 22 can be formed to be mirror symmetrical by arranging the fixing portions 4b, 4b of the restricting portions 23, 24 provided on the discs 21, 22 in the same direction, which is the direction in which the discs are rotated, relative to the protrusion 5. In this way, common specifications can be used for double discs with discs on the left and right sides of the wheel, and discs provided on the right or left side of the vehicle, allowing for standardization of variations.

[0034] The present invention is not limited to the above-described embodiments, and the materials of the hub and rotor are optional, as are the number of protrusions and the number of recesses corresponding to the protrusions. Furthermore, in the above-described second embodiment, the fixing portion is positioned in the disk rotation direction relative to the protrusion, but it may also be positioned in the disk rotation direction. Furthermore, the dust seals of each cylinder hole may be omitted. [Explanation of symbols]

[0035] 1...disk, 2...rotor, 2a...inner peripheral edge, 2b...through hole, 3...hub, 3a...wheel mounting portion, 3b...outer peripheral edge, 3c...one axial surface of rotor, 3d...other axial surface of rotor, 4...regulating portion, 4a...covering portion, 4b...fixing portion, 4c...first claw portion, 4d...second claw portion, 5...projecting piece, 5a...one axial surface of rotor, 5b...other axial surface of rotor, 6...recess, 6a...wall, 6b...side wall, 7...bolt insertion hole, 8...bolt (Fastening member of the present invention), 8a... female screw hole, 10... disc brake, 11... caliper body, 11a... action portion, 11b... bridge portion, 11c... cylinder hole, 11d... vehicle body mounting portion, 12... friction pad, 12a... lining, 12b... back plate, 13... piston, 14... piston seal, 15... hydraulic chamber, 16... union hole, 17... brewer, 18... dust seal, 21, 22... disc, 23, 24... restriction portion

Claims

1. an annular rotor having a plurality of protrusions protruding toward the inner periphery on an inner periphery; a hub disposed on the inner periphery of the rotor and having recesses on its outer periphery that receive the respective protrusions; a restricting portion that restricts movement of the protruding piece housed in the recess in the rotor axial direction to connect the rotor and the hub; A disc for a disc brake, comprising: The restricting portion includes a cover portion that covers the protruding piece received in the recessed portion; a fixing portion provided on one side in the disk circumferential direction with the protruding piece interposed therebetween; a first claw portion provided on the other side of the disk in the circumferential direction with the protrusion in between and straddling the outer peripheral edge portion of the hub; A disc for a disc brake, comprising:

2. 2. The disc for a disc brake according to claim 1, wherein the cover portion restricts the projection received in the recess from moving in the axial direction of the rotor from one axial surface of the rotor.

3. 2. The disc for a disc brake according to claim 1, wherein the restricting portion has a second claw portion extending from a tip of the first claw portion toward the center of the rotor.

4. The restricting portion is fastened to the hub by rotating a fastening member inserted into the fixing portion, 2. The disc for a disc brake according to claim 1, wherein the first claw portion abuts against an outer peripheral edge portion of the hub to prevent the regulating portion from rotating in association with rotation of the fastening member.

5. 2. A disc for a disc brake according to claim 1, characterized in that a plurality of the discs are arranged for one wheel of a saddle-ride type vehicle, and the fixing portion of the regulating portion provided on each disc is provided in the same direction relative to the protrusion, which is either the disc rotation direction or the disc rotation direction.

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