Disk for disk brake

Abstract

Provided is a disk for a disk brake with which the occurrence of knockback due to rotor tipping can be prevented using a restricting part constituted of a small number of parts, and the work of assembling the rotor and a hub can be easily performed, the disk having a rotor 2 in which a plurality of projections 5 are formed on an inner peripheral edge part 2a, a hub 3 disposed on the inner peripheral side of the rotor 2 and provided with recesses 6 for accommodating the projections 5 on an outer peripheral edge part 3b, and restricting parts for restricting rotor-axial-direction movement of the projections 5 accommodated in the recesses 6. The recesses 6 are opened in the outer peripheral edge part 3b of the hub 3 and at one side in the rotor shaft direction, and are closed at the other side in the rotor shaft direction by walls 6a integrated with the hub 3. The restricting parts are each formed of a washer 7 covering one rotor-axial-direction surface 5a of the projection 5 accommodated in the recess 6. The washers 7 are fastened to one rotor-axial-direction surface 3c of the hub 3 by bolts 8 (fastening members of the present invention), and the washers 7 each cover one rotor-axial-direction surface 5a of the projection 5 accommodated in the recess 6.

Description

Disc for disc brake

[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.

[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 13 and 14, 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. When the floating pin 51 is inserted 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).

[0007] WO2007 / 074488

[0008] However, in the case where the regulating portion is made up of the floating pin 51, washer 52, and E-ring 53, as shown in Figure 14, a clearance C1 is formed between the flange portion 51a and one side surface 50c of the protruding piece 50a, a clearance C2 is formed between the other side surface 50d of the protruding piece 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 regulating portion and the protruding piece 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.

[0011] In order to achieve the above 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 regulates the axial movement of the protrusions housed in the recesses, thereby connecting the rotor and the hub, wherein the recesses are open to the outer peripheral edge of the hub and on one side in the axial direction of the rotor, and are closed on the other side in the axial direction of the rotor by a wall integral with the hub, and the regulating portion is fastened to one surface of the hub on the rotor axial direction by at least one fastening member, corresponding to the protrusions.

[0012] The disc for a disc brake of the present invention allows the rotor and hub to be reliably connected 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 position adjustment of the rotor and hub is not required, improving ease of assembly.

[0013] 5 is an exploded perspective view of a rotor, a hub, and a regulating portion according to a first embodiment of the present invention. FIG. 5 is a cross-sectional view taken along II-II in FIG. 4. FIG. 5 is an exploded perspective view of a disk according to a first embodiment of the present invention. FIG. 6 is a front view of a disk according to a first embodiment of the present invention. FIG. 7 is a rear view of a disk with a disk brake according to a first embodiment of the present invention attached thereto. FIG. 7 is a cross-sectional view taken along VI-VI in FIG. 5. FIG. 8 is a front view of a disk according to a second embodiment of the present invention. FIG. 9 is a front view of a disk according to a second embodiment of the present invention. FIG. 10 is a front view of a rotor, a hub, and a regulating portion according to a third embodiment of the present invention. FIG. 11 is an exploded perspective view of a rotor, a hub, and a regulating portion according to a fourth embodiment of the present invention. FIG. 12 is an exploded perspective view of a disk according to a fourth embodiment of the present invention. FIG. 13 is a front view of a disk according to a fourth embodiment of the present invention. FIG. 14 is a cross-sectional view of a rotor, a hub, and a regulating portion according to a conventional rotor, a hub, and a regulating portion. FIG. 15 is an enlarged cross-sectional view of a rotor, a hub, and a regulating portion according to a conventional rotor, a hub, and a regulating portion.

[0014] 1 to 6 show a first embodiment of a disk for a disk brake of the present invention. The disk 1 is formed by connecting, via a restricting portion, an annular rotor 2 on which a disk brake 10 is disposed, and a hub 3 disposed on the inner periphery of the rotor 2 and rotating integrally with a wheel (not shown).

[0015] The rotor 2 is made of a metal plate made of heat-resistant stainless steel, carbon steel, or the like, and has, for example, twelve protrusions 5 that protrude inward and are spaced equally apart circumferentially from the inner peripheral edge 2a. The rotor 2 also has 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 at its center for attachment to the wheel, allowing it to rotate integrally with the wheel. The hub 3 has twelve recesses 6 formed on its outer circumferential edge 3b, each formed in a shape corresponding to one of the protrusions 5. Each recess 6 is open to the outer circumferential edge 3b of the hub 3 and one side in the rotor axial direction, and is closed on the other side in the rotor axial direction by a wall 6a 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 is formed by a washer 7 having a diameter large enough to cover one surface 5a in the rotor axial direction of the protrusion 5 housed in the recess 6. A female screw hole 8a is formed in the hub 3 near the recess 6, and the washer 7 is attached to the hub 3 by fastening a bolt 8 (the fastening member of the present invention) inserted into the bolt insertion hole 7a of the washer 7 to the female screw hole 8a. Accordingly, the washer 7 covers the opening of the recess 6 that is open to one surface 5a in the rotor axial direction, i.e., it covers one surface 5a in the rotor axial direction of the protrusion 5 housed in the recess 6.

[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 bolts 8 with washers 7 inserted therethrough are fastened to the female threaded holes 8a, and the washers 7 are attached to the surface 3c of the hub 3 on one side in the rotor axial direction.

[0020] As a result, each washer 7 abuts against one surface 5a of the protrusion 5 on the rotor axial direction, covering the surface 5a, and the movement of each protrusion 5 housed in each recess 6 in the rotor axial direction is restricted by the wall 6a and the washer 7. Furthermore, the movement of each protrusion 5 in the circumferential direction is also restricted by both side walls 6b, 6b of the recess 6 in the hub radial direction, and the rotor 2 and hub 3 are reliably connected.

[0021] 5 and 6, 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.

[0022] 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 bores 11c that are open toward the rotor 2 and are aligned in the circumferential direction of the rotor 2. Each cylinder bore 11c accommodates a piston 13 via a piston seal 14 and a dust seal 18. A hydraulic chamber 15 is defined between the cylinder bore 11c and the bottom 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 also has a pair of vehicle body mounting portions 11d.

[0023] 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 friction pad.

[0024] Since the disk 1 of this embodiment is formed as described above, when assembling the disk 1, the rotor 2 and 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 restricting portion 4 can be easily performed from one direction (one axial side of the rotor), improving the ease of assembly of the rotor 2 and hub 3. Furthermore, the restricting portion 4 is composed of a washer 7 and a bolt 8, and since it is configured with a small number of parts, the weight and cost of the disk 1 can be reduced.

[0025] Furthermore, because the washer 7 covers the one axial surface 5a of the protrusion 5, even if the clearance due to tolerance between the one axial surface 5a of the protrusion 5 and the washer 7 and the clearance due to tolerance between the other axial surface 5b of the protrusion 5 and the wall 6a (FIG. 2) increase, 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 tipping of the rotor 2, and to obtain a stable braking force.

[0026] 7 to 12 show other embodiments of the present invention, and the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0027] 7 and 8 show a disk 21 according to a second embodiment of the present invention. The restricting portion 22 according to this embodiment is formed in a generally oval shape with a base end surface 22a and a tip end surface 22b that are arc-shaped, and is provided with a mounting portion 22c on the base end side that is bolted, and a cover portion 22d on the tip end side that covers one surface 5a in the rotor axial direction of the protruding piece 5 housed in the recess 6.

[0028] Furthermore, around each female screw hole 8 a of the hub 3 , a counterbore 23 (positioning portion of the present invention) corresponding to the shape of the restricting portion 22 is formed in a stepped shape.

[0029] To assemble the disk 21, 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. Next, each restriction portion 22 is placed in the counterbore 23, and the base end surface 22a and side end surfaces 22e, 22e are abutted against the counterbore 23. Accordingly, the cover portion 22d of the restriction portion 22 covers the one surface 5a in the rotor axial direction of the protrusion 5 accommodated in the recess 6. Next, the bolt 8 is inserted into the mounting portion 22c of the restriction portion 22 and fastened to the female screw hole 8a, thereby attaching the restriction portion 22 to the one surface 3c in the rotor axial direction of the hub 3.

[0030] As described above, in this embodiment, the restricting portion 22 is disposed in the counterbore 23, and the bolt 8 is fastened in a state in which the restricting portion 22 is positioned and prevented from rotating, thereby further improving the ease of assembly. Furthermore, compared to the first embodiment in which the washer 7 is used as the restricting portion, the restricting portion 22 can be formed smaller.

[0031] 9 shows a disk 31 according to a third embodiment of the present invention. The restricting portion 32 of this embodiment has a mounting portion 32a at its base end that is secured by a bolt 8, and a cover portion 32b at its tip end that covers one axial surface 5a of the protruding piece 5 housed in the recess 6. A pair of anti-rotation portions 32c, 32c are formed on both widthwise sides of the cover portion 32b.

[0032] Additionally, around each female screw hole 8a of the hub 3, a counterbore 33 (positioning portion of the present invention) corresponding to the shape of the restricting portion 32 is formed in a substantially T-shape.

[0033] As in the second embodiment, the disk 31 is assembled by inserting the protrusions 5 of the rotor 2 into the recesses 6 of the hub 3, and positioning the restricting portion 32 in the counterbore 33. As a result, the base end face 32d and side end faces 32e, 32e of the restricting portion 32c and the base end faces 32f, 32f of the anti-rotation portion 32c abut against the counterbore 33, thereby achieving positioning and anti-rotation. Furthermore, the cover portion 32b covers one axial surface 5a of the protrusion 5 housed in the recess 6. Next, the bolt 8 is inserted through the mounting portion 32a of the restricting portion 32 and fastened to the female screw hole 8a, thereby attaching the restricting portion 32 to the one axial surface 3c of the hub 3.

[0034] In the second and third embodiments described above, the positioning and rotation prevention of the regulating portions 22, 32 are achieved by providing the countersunk portions 23, 33, but the present invention is not limited to this, and the hub may be provided with a protrusion that positions the cover member in a predetermined position.

[0035] 10 to 12 show a disk 41 according to a fourth embodiment of the present invention. In this embodiment, nine protrusions 5 are provided on the rotor 2 at equal intervals in the circumferential direction, and nine recesses 6 are provided on the hub 3 at equal intervals in the circumferential direction.

[0036] The restricting portions 42 of this embodiment each include an attachment portion 42a that is bolted to the base end, and a cover portion 42b that covers one axial surface 5a of the protruding piece 5 housed in the recess 6 at the tip end. The nine restricting portions 42 are connected together in an arc shape along the outer diameter of the hub 3 by a connecting member 43. The nine restricting portions 42 and the connecting member 43 form a single ring-shaped component, and the nine restricting portions 42 are provided at equal intervals around the circumferential direction of the connecting member 43.

[0037] To assemble the disk 41, the protrusions 5 of the rotor 2 are inserted into the recesses 6 of the hub 3, the connecting member 43 is placed on the outer periphery of the one axial surface 3c of the hub 3, and the cover portions 42b of the restricting portions 42 are aligned so that they cover the one axial surface 5a of each protrusion 5. Next, the restricting portions 42 are attached to the one axial surface 3c of the hub 3 by inserting bolts 8 into bolt insertion holes 42c formed in the mounting portions 42a of the restricting portions 42 and fastening them to the female screw holes 8a. Furthermore, when aligning the restricting portions 42, because the protrusions 5, recesses 6, and restricting portions 42 are formed at equal intervals in the circumferential direction, aligning one restricting portion 42 automatically aligns the other restricting portions 42 as well.

[0038] As described above, in this embodiment, the connecting member 43 integrally connects the regulating portions 42, so that the regulating portions 42 can be integrated into a single product, thereby reducing the number of parts. Furthermore, when assembling the disk 41, the positioning of the regulating portions 42 is simplified, and the assembly work can be performed efficiently.

[0039] The present invention is not limited to the above-described embodiments. The materials of the hub and rotor may be selected as desired, and the number of protrusions and the number of recesses corresponding to the protrusions may also be selected as desired. Furthermore, while the cover member is attached to one axial surface of the rotor of the hub with a single bolt, it may be fastened with multiple fastening members. Furthermore, the dust seals of each cylinder bore may be omitted.

[0040] 1...disc, 2...rotor, 2a...inner peripheral edge portion, 2b...through hole, 3...hub, 3a...wheel mounting portion, 3b...outer peripheral edge portion, 3c...one axial surface of rotor, 5...projection piece, 5a...one axial surface of rotor, 5b...other axial surface of rotor, 6...recess, 6a...wall, 6b...side wall, 7...washer (regulating portion of the present invention), 7a...bolt insertion hole, 8...bolt (fastening member of the present invention), 8a...female thread 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... Disk, 22...regulating portion, 22a...base end surface, 22b...tip surface, 22c...mounting portion, 22d...covering portion, 23...counterbore (positioning portion of the present invention), 31...disk, 32...regulating portion, 32a...mounting portion, 32b...covering portion, 32c...rotation prevention portion, 32d...base end surface, 32e...side end surface, 32f...base end surface, 33...counterbore (positioning portion of the present invention), 41...disk, 42 ...Regulating portion, 42a...mounting portion, 42b...covering portion, 42c...bolt insertion hole, 43...connecting member, 50...rotor, 50a...projection piece, 50b...pin insertion hole, 50c...one side surface, 50d...other side surface, 50e...mounting groove, 51...floating pin, 51a...flange portion, 52...washer, 53...E-ring, 54...hub, 54a...recess, 54b...one side surface, 54c...other side surface

Claims

1. A disc for a disc brake comprising: an annular rotor having, on its inner circumferential edge, a plurality of protrusions that protrude inward; a hub arranged on the inner circumferential side of the rotor and having recesses on its outer circumferential edge that receive each of the protrusions; and a restricting portion that restricts axial movement of the protrusions housed in the recesses, thereby connecting the rotor and the hub, wherein the recesses are open to the outer circumferential edge of the hub and one side in the axial direction of the rotor, and are closed on the other side in the axial direction of the rotor by a wall that is integral with the hub, and the restricting portion is fastened to one surface of the hub in the axial direction of the rotor by at least one fastening member that corresponds to each of the protrusions.

2. A disc for a disc brake according to claim 1, characterized in that the restricting portion has a covering portion that covers the protruding piece housed in the recess from one axial side of the rotor.

3. A disc for a disc brake according to claim 1, wherein a positioning portion for positioning said restricting portion is formed on said hub.

4. A disc for a disc brake according to any one of claims 1 to 3, characterized in that a plurality of said restricting portions are connected by a connecting member.

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