JP7576393B2 - Vehicle disc brakes - Google Patents

Description

The present invention relates to a vehicle disc brake, and more specifically, to a vehicle disc brake in which a pad spring is disposed between the bridge portion of the caliper body and the friction pad to suppress rattling of the friction pad.

Conventionally, a caliper body is formed by connecting a pair of working parts arranged opposite each other on either side of the disc rotor with a bridge part that straddles the outer circumference of the disc rotor, and the bridge part has a disc rotation-in bridge part formed on the disc rotation-in side when the vehicle is moving forward, a disc rotation-out bridge part formed on the disc rotation-out side when the vehicle is moving forward, and an intermediate bridge part formed in the middle between the disc rotation-in bridge part and the disc rotation-out bridge part, and ceiling openings are provided between the intermediate bridge part and the disc rotation-in bridge part, and between the intermediate bridge part and the disc rotation-out bridge part. In some vehicle disc brakes, a pad spring that abuts against the friction pad and suppresses rattling of the friction pad is arranged on the inner wall of the intermediate bridge part (see, for example, Patent Document 1).

Patent No. 6219576

In general, in a caliper body for a vehicle disc brake formed by connecting a pair of working parts arranged opposite each other on either side of the disc rotor with a bridge part that straddles the outer circumference of the disc rotor, it is known that the rigidity increases when the central axis of the cylinder hole formed in the working part is brought closer to the inner wall of the bridge part at the center in the disc rotation direction. However, in the above-mentioned Patent Document 1, a pad spring that suppresses rattling of the friction pad is provided on the inner wall of the intermediate bridge part, so the length between the central axis of the cylinder hole and the inner wall of the intermediate bridge part is long. For this reason, the intermediate bridge part is made thick to ensure rigidity, but there is a risk that the caliper body will become large and heavy.

The present invention aims to provide a vehicle disc brake that uses a pad spring to suppress rattling of the friction pads and ensures rigidity while allowing the caliper body to be made smaller and lighter.

In order to achieve the above object, the vehicle disc brake of the present invention forms a caliper body by connecting a pair of working parts arranged opposite to each other with a disc rotor between them by a bridge part that straddles the outer periphery of the disc rotor, the working parts include a cylinder hole that accommodates a piston, and a friction pad accommodating part that accommodates a pair of friction pads arranged to sandwich the disc rotor, the friction pads have protruding ears on the disc rotation-in side and the disc rotation-out side on the radially outer side of the disc when the vehicle moves forward, and the ears are arranged movably in the disc axial direction on torque receiving steps provided on the radially outer side of the friction pad accommodating part, and the bridge part has a disc rotation-in side bridge part formed on the disc rotation-in side when the vehicle moves forward, a disc rotation-out side bridge part formed on the disc rotation-out side when the vehicle moves forward, and an intermediate bridge part formed in the intermediate part between the disc rotation-in side bridge part and the disc rotation-out side bridge part. In addition, in a vehicle disc brake in which a ceiling opening is provided between the intermediate bridge portion and the disc rotation side bridge portion, and between the intermediate bridge portion and the disc rotation side bridge portion, a pad spring is attached to the disc rotation side bridge portion and the disc rotation side bridge portion, the pad spring having a resilient piece that extends toward the adjacent ceiling opening and abuts against the friction pad to urge the friction pad radially inwardly on the disc, and the friction pad has a receiving portion that receives the resilient piece on the radially outer surface of a back plate to which a lining is attached, on the disc rotation side and the disc rotation side between a position corresponding to the intermediate bridge portion and the ear piece, and the radially outer surface of the receiving portion is positioned radially outward of the disc with respect to a plane that is an imaginary extension of the innermost surface in the radial direction of the disc of the inner wall of the intermediate bridge portion.

It is also preferable that the friction pad has a recess formed on the radially outer surface of the disk at a position corresponding to the intermediate bridge portion.

According to the vehicle disc brake of the present invention, the pad springs are attached to the bridge section on the disc rotation side and the bridge section on the disc rotation side, and have elastic pieces that extend toward the adjacent ceiling opening and abut against the friction pads to urge the friction pads radially inwardly on the disc, thereby suppressing rattling of the friction pads. Furthermore, a receiving portion that receives the elastic piece of the pad spring is provided on the back plate of the friction pad, and the receiving portion is positioned radially outward of the inner wall of the intermediate bridge section, so that the friction pads can be positioned radially outward of the caliper body, and the cylinder hole formed in the action section can also be formed radially outward of the caliper body. This allows the center axis of the cylinder hole to be brought closer to the inner wall of the intermediate bridge section, shortening the radial length of the caliper body while ensuring the rigidity of the caliper body, thereby making the caliper body smaller and lighter.

In addition, by forming a recess on the radially outer surface of the disc at a position corresponding to the intermediate bridge portion, the friction pad alone can be made lighter, and the friction pad can be positioned further outward in the radial direction of the disc of the caliper body, so that the center axis of the cylinder hole and the inner wall of the intermediate bridge portion can be brought closer together. This shortens the radial length of the caliper body while maintaining the rigidity of the caliper body, making it possible to further reduce the size and weight of the caliper body, and ultimately the disc brake itself.

1 is a front view of a vehicle disc brake showing one embodiment of the present invention; FIG. FIG. FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. FIG. 4 is a cross-sectional view taken along line V-V of FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. FIG. 7 is a cross-sectional view taken along line VII-VII of FIG.

Figures 1 to 7 show an example of a vehicle disc brake according to the present invention. Note that arrow A indicates the direction of rotation of the disc rotor that rotates together with the wheel when the vehicle moves forward, and the disc rotation outward and inward sides described below refer to the direction when the vehicle moves forward.

The vehicle disc brake 1 comprises a disc rotor 2 that rotates together with the wheel, a monocoque structure piston-opposed caliper body 3 that is attached to the vehicle body at one side of the disc rotor 2, a pair of friction pads 4, 4 arranged on both sides of the disc rotor 2, a rotation-in pad spring 5 that biases the friction pads 4, 4 radially inward and to the disc rotation-out side, and a rotation-out pad spring 6 that biases the friction pads 4, 4 radially inward.

The caliper body 3 is integrally formed with a pair of acting parts 3a, 3a and a bridge part 3b that connects the pair of acting parts 3a, 3a across the disc rotor 2. The bridge part 3b has a disc rotation-in side bridge part 3c that is arranged on the disc rotation-in side, a disc rotation-out side bridge part 3d that is arranged on the disc rotation-out side, and an intermediate bridge part 3e that is arranged halfway between the disc rotation-in side bridge part 3c and the disc rotation-out side bridge part 3d. A first ceiling opening 3f is formed between the intermediate bridge part 3e and the disc rotation-in side bridge part 3c, and a second ceiling opening 3g is formed between the intermediate bridge part 3e and the disc rotation-out side bridge part 3d. On the disk rotation exit side and disk rotation entry side of one of the action parts 3a, mounting bosses 3h, 3h are formed in the disk radial direction, and mounting bolt insertion holes 3i are formed in each mounting boss 3h in the disk radial direction. The caliper body 3 is attached to the vehicle body by screwing a mounting bolt (not shown) inserted into the mounting bolt insertion hole 3i into the caliper mounting part provided on the vehicle body side.

Each working portion 3a is provided with a pair of cylinder portions 3j with cylinder holes 7, 7 of the same diameter arranged in the disk circumferential direction, which are open on the disk rotor 2 side, and each cylinder hole 7 houses a piston 8 via a piston seal 9 and a dust seal 10. Between the bottom side of each cylinder hole 7 and the piston 8, a hydraulic pressure chamber 11 to which hydraulic fluid is supplied is defined, and adjacent hydraulic pressure chambers 11, 11 are connected to each other via a hydraulic fluid communication hole 12. In addition, when the caliper body 3 is attached to the vehicle body, a fluid passage hole 13 is drilled on the disk rotation side of the caliper body 3, which is located above the vehicle body, from one acting part 3a located on the outside of the vehicle body to the hydraulic chamber 11 on the disk rotation side of the other acting part 3a, and a fluid passage hole 13 is drilled from the other acting part 3a to the hydraulic chamber 11 on the disk rotation side of the one acting part 3a. These two fluid passage holes 13 are crossed, and a union hole 14 is formed at the opening of one fluid passage hole 13, and a brewer hole for attaching a brewer 15 is formed at the opening of the other fluid passage hole 13.

Each of the action parts 3a, 3a is provided with a friction pad accommodating section 3k for accommodating the friction pads 4, 4. Each of the friction pad accommodating sections 3k has a rotation-in side torque receiving surface 3n formed on the cylinder hole 7 side of the disk rotation-in side surface 3m of the first ceiling opening 3f and radially inward of the disk rotation-in side surface 3m, and a rotation-out side torque receiving surface 3q formed on the cylinder hole 7 side of the disk rotation-out side surface 3p of the second ceiling opening 3g and radially inward of the disk, and a rotation-in side torque receiving step 3r is formed between the disk rotation-in side surface 3m and the rotation-in side torque receiving surface 3n, and a rotation-out side torque receiving step 3s is formed between the disk rotation-out side surface 3p and the rotation-out side torque receiving surface 3q. Furthermore, a rotation-in side mounting recess 3t is formed on the radial inner surface of the disk in the axial center of the disk inlet bridge portion 3c, for mounting the rotation-in side pad spring 5, and a rotation-out side mounting recess 3u is formed on the radial inner surface of the disk in the axial center of the disk outlet bridge portion 3d, for mounting the rotation-out side pad spring 6.

Each friction pad 4 is made up of a lining 4a that slides against the side of the disc rotor 2 and a metal back plate 4b to which the lining 4a is attached, with lugs 4c, 4c protruding from the back plate 4b on the radially outer side of the disc on the inlet side and outlet side. Furthermore, a pair of protrusions 4d, 4d that protrude radially outward from the radially outer surface of the back plate 4b are formed on the radially outer surface of the disc, and a recess 4g is formed on the radially outer surface of the disc at a position corresponding to the intermediate bridge portion 3e between the protrusions 4d, 4d.

The turn-in side pad spring 5 is provided with a turn-in side mounting part 5a that is attached to the turn-in side mounting recess 3t, a turn-in side resilient piece 5b (the resilient piece of the present invention) that extends from the turn-in side mounting part 5a and abuts against the friction pads 4, 4, biasing the friction pads 4, 4 radially inward and toward the disk turn-out side, and a turn-in side retainer piece 5c that is laid on the turn-in side torque receiving step 3r. The turn-in side resilient piece 5b extends from the turn-in side mounting part 5a radially outward of the friction pad 4, then bends back toward the friction pad side, and the tip part 5d abuts against the disk turn-in side 4e (the receiving part of the present invention) of both protrusions 4d on the disk turn-in side.

The rotating side pad spring 6 includes a rotating side mounting portion 6a that is attached to the rotating side mounting recess 3u, a rotating side resilient piece 6b (the resilient piece of the present invention) that extends from the rotating side mounting portion 6a and abuts against the friction pads 4, 4, urging the friction pads 4, 4 radially inward, and a rotating side retainer piece 6c that is laid on the rotating side torque receiving step 3s. The rotating side resilient piece 6b extends from the rotating side mounting portion 6a radially outward of the friction pad 4, and then bends back toward the friction pad side, with the tip 6d abutting against the radially outer surface 4f of the disk (the receiving portion of the present invention) between the projection 4d of the disk rotating side and the ear piece 4c.

The friction pads 4, 4 formed as described above, the rotation-in side pad spring 5, and the rotation-out side pad spring 6 are assembled by first engaging the rotation-in side mounting portion 5a of the rotation-in side pad spring 5 with the rotation-in side mounting recess 3t, placing the rotation-in side retainer piece 5c on the rotation-in side torque receiving step 3r, and engaging the rotation-out side mounting portion 6a of the rotation-out side pad spring 6 with the rotation-out side mounting recess 3u, placing the rotation-out side retainer piece 6c on the rotation-out side torque receiving step 3s. Next, the ear pieces 4c, 4c of the friction pads 4, 4 are supported by the rotation-in side torque receiving step 3r and the rotation-out side torque receiving step 3s via the rotation-in side retainer piece 5c and the rotation-out side retainer piece 6c.

With this assembly, each friction pad 4, 4 is disposed within the friction pad accommodating portion 3k, 3k, and is arranged so as to be movable in the disk axial direction along the inlet torque receiving step portion 3r and the outlet torque receiving step portion 3s via the ears 4c, 4c, and the radially outer disk surface 4f, 4f between the protrusions 4d, 4d and the ears 4c, 4c and the protrusions 4d and the ears 4c are arranged radially outward of the inner wall 3v of the intermediate bridge portion 3e. In addition, the tip 5d of the resilient piece 5b of the in-turn pad spring 5 abuts against the in-turn side surfaces 4e, 4e of the protrusions 4d, 4d on the in-turn side of both friction pads 4, and the tip 6d of the resilient piece 6b of the out-turn pad spring 6 abuts against the radially outer surfaces 4f, 4f of the disk between the protrusions 4d and the ears 4c of both friction pads 4. As a result, the friction pads 4, 4 are biased toward the disk out-turn side and the radially inward direction of the disk by the in-turn pad spring 5, and are biased toward the radially inward direction of the disk by the out-turn pad spring 6.

The vehicle disc brake 1 of this embodiment is formed as described above, and thus the rattle of the friction pads 4, 4 can be suppressed by the rotation-in pad spring 5 and the rotation-out pad spring 6. Furthermore, the back plates 4b, 4b of the friction pads 4, 4 are provided with the disk rotation-in side surfaces 4e, 4e of the protruding pieces 4d, 4d against which the rotation-in side resilient pieces 5b, 5b of the rotation-in pad spring 5 abut, and the disk radial direction outer side surfaces 4f, 4f against which the rotation-out side resilient pieces 6b, 6b of the rotation-out side pad spring 6 abut, and these disk radial direction outer side surfaces 4f, 4f and the disk rotation-in side surfaces 4e, 4e are disposed radially outward of the inner wall 3v of the intermediate bridge portion 3e, so that the friction pads 4, 4 can be disposed radially outward of the caliper body 3, and the cylinder holes 7, 7 formed in the action portions 3a, 3a can also be formed radially outward of the caliper body 3. This allows the central axis CL1 of the cylinder holes 7, 7 to be brought closer to the inner wall 3v of the intermediate bridge portion 3e, and while ensuring the rigidity of the caliper body 3, the length of the caliper body 3 in the disc radial direction can be shortened, thereby making it possible to reduce the size and weight of the caliper body 3. Furthermore, by forming the recess 4g in the back plate 4b of the friction pad 4, the weight of the friction pad alone can be reduced, and the friction pad 4 can be disposed further outward in the disc radial direction of the caliper body 3, so that the central axis CL1 of the cylinder hole 7 can be brought closer to the inner wall 3v of the intermediate bridge portion 3e, making it possible to further reduce the size and weight of the caliper body 3, and therefore the disc brake itself.

The present invention is not limited to the above-mentioned embodiment, and the shape of the inlet pad spring and outlet pad spring may be any shape as long as they have a resilient piece that abuts against the friction pad to suppress rattling of the friction pad. The friction pad does not need to have a recess on the radially outer surface of the disk at the position corresponding to the intermediate bridge. Furthermore, the number of cylinder holes formed in each working portion of the caliper body is arbitrary. The caliper body of the present invention is not limited to a monocoque structure, and may be a split caliper body.

1...vehicle disc brake, 2...disc rotor, 3...caliper body, 3a...action part, 3b...bridge part, 3c...disc inlet bridge part, 3d...disc outlet bridge part, 3e...intermediate bridge part, 3f...first ceiling opening, 3g...second ceiling opening, 3h...mounting boss part, 3i...mounting bolt insertion hole, 3j...cylinder part, 3k...friction pad housing part, 3m...disc inlet side, 3n...inlet torque receiving surface, 3p...disc outlet side, 3q...outlet torque receiving surface, 3r...inlet torque receiving step part, 3s...outlet torque receiving step part, 3t...inlet mounting recess, 3u...outlet mounting recess, 3v ...Inner wall, 4...Friction pad, 4a...Lining, 4b...Back plate, 4c...Ear piece, 4d...Protruding piece, 4e...Inlet side of disc, 4f...Radial outer surface of disc, 4g...Recess, 5...Inlet pad spring, 5a...Inlet mounting part, 5b...Inlet spring piece, 5c...Inlet retainer piece, 5d...Tip, 6...Outlet pad spring, 6a...Outlet mounting part, 6b...Outlet spring piece, 6c...Outlet retainer piece, 6d...Tip, 7...Cylinder hole, 8...Piston, 9...Piston seal, 10...Dust seal, 11...Hydraulic pressure chamber, 12...Hydraulic fluid communication hole, 13...Fluid communication hole, 14...Union hole, 15...Brewer

Claims (2)

a caliper body is formed by connecting a pair of working parts arranged opposite to each other with a disc rotor therebetween with a bridge part straddling the outer periphery of the disc rotor, the working parts having a cylinder hole for accommodating a piston and a friction pad accommodating part for accommodating a pair of friction pads arranged on either side of the disc rotor, the friction pads have protruding ears on the disc rotation inlet side and the disc rotation outlet side on the radially outer side of the disc when the vehicle moves forward, and the ears are arranged movably in the disc axial direction on torque receiving steps provided on the radially outer side of the friction pad accommodating part, the bridge parts having a disc rotation inlet bridge part formed on the disc rotation outlet side when the vehicle moves forward, a disc rotation outlet bridge part formed on the disc rotation outlet side when the vehicle moves forward, and an intermediate bridge part formed intermediately between the disc rotation inlet bridge part and the disc rotation outlet bridge part, and ceiling openings are provided between the intermediate bridge part and the disc rotation inlet bridge part, and between the intermediate bridge part and the disc rotation outlet bridge part,
a pad spring having a resilient piece that extends toward the adjacent ceiling opening side and abuts against the friction pad to urge the friction pad radially inwardly on the disc is attached to each of the disc entry bridge portion and the disc exit bridge portion, the pad spring having a resilient piece that extends toward the adjacent ceiling opening side and abuts against the friction pad to urge the friction pad radially inward on the disc, the friction pad has a receiving portion that receives the resilient piece on the radially outer surface of a back plate to which a lining is attached, on the disc entry side and the disc exit side between a position corresponding to the intermediate bridge portion and the ear piece, and the radially outer surface of the receiving portion is positioned radially outward of the disc with respect to a plane that is an imaginary extension of the innermost surface in the radial direction of the disc of the inner wall of the intermediate bridge portion. A vehicle disc brake as claimed in claim 1, characterized in that the friction pad has a recess formed on the radially outer surface of the disc at a position corresponding to the intermediate bridge portion.

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