# US 9,752,633 B2 · Bicycle disc brake rotor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,752,633 B2 - Document ID: US9752633B2 - Status: Granted - Kind: B2 - Application number: 14/997,584 - Filed: 2016-01-18 - Published: 2017-07-20 - Granted: 2017-09-05 - Earliest claimed: 2016-01-18 - Assignees: Shimano Inc. - Applicants: Shimano Inc. - Inventors: Masahiro Nakakura; Yusuke Hosomi; Noriko Masuta - Web page: https://patentgrep.com/patent/US9752633B2 ## CPC - F16D 65/128: {characterised by means for cooling} - F16D 65/123: {comprising an annular disc secured to a hub member; Discs characterised by means for mounting} - F16D 2065/1316: {radially segmented} - F16D 2065/132: {layered} - F16D 2065/1324: {carrying friction elements} - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES ## Abstract A bicycle disc brake rotor comprises a friction member and a cooling member. The friction member includes at least one friction surface and a first inner peripheral edge. The cooling member includes a cooling body. The cooling body includes at least one cooling surface and a second inner peripheral edge. The second inner peripheral edge is provided radially inward of the first inner peripheral edge with respect to a rotational center axis of the bicycle disc brake rotor. The radially outer part is provided radially outward of the cooling body. The second inner peripheral edge is offset from the radially outer part in an axial direction parallel to the rotational center axis of the bicycle disc brake rotor. ## Claims ### Claim 1 A bicycle disc brake rotor comprising: a friction member including at least one friction surface and a first inner peripheral edge; a cooling member including a cooling body including at least one cooling surface and a second inner peripheral edge, the second inner peripheral edge being provided radially inward of the first inner peripheral edge with respect to a rotational center axis of the bicycle disc brake rotor, and a radially outer part provided radially outward of the cooling body, the second inner peripheral edge being offset from the radially outer part in an axial direction parallel to the rotational center axis of the bicycle disc brake rotor; and a hub attachment member coupled to the friction member at a coupling part, the hub attachment member including a hub engagement structure to engage with a bicycle hub assembly, the second inner peripheral edge being provided radially inward of the coupling part with being spaced apart from the hub attachment member in the axial direction. ### Claim 2 (depends on 1) The bicycle disc brake rotor according to claim 1, wherein the friction member is attached to the radially outer part. ### Claim 3 (depends on 2) The bicycle disc brake rotor according to claim 2, wherein the radially outer part includes a first attachment surface, the friction member includes a first friction part attached to the first attachment surface, and an axial distance defined between the first attachment surface and the second inner peripheral edge in the axial direction is greater than 0 mm and equal to or less than 1 mm. ### Claim 4 (depends on 1) The bicycle disc brake rotor according to claim 1, wherein the second inner peripheral edge is farther from a bicycle body of a bicycle than the radially outer part in the axial direction in a state where the bicycle disc brake rotor is mounted to the bicycle body. ### Claim 5 (depends on 1) The bicycle disc brake rotor according to claim 1, wherein the cooling body includes a curved part provided between the radially outer part and the second inner peripheral edge. ### Claim 6 (depends on 5) The bicycle disc brake rotor according to claim 5, wherein the curved part has a curved convex cross section taken along a plane defined on the rotational center axis. ### Claim 7 (depends on 6) The bicycle disc brake rotor according to claim 6, wherein the curved convex cross section protrudes away from a bicycle body of a bicycle in the state where the bicycle disc brake rotor is mounted to the bicycle body. ### Claim 8 (depends on 1) The bicycle disc brake rotor according to claim 1, wherein the second inner peripheral edge is offset from the radially outer part in the axial direction beyond the at least one friction surface. ### Claim 9 (depends on 1) The bicycle disc brake rotor according to claim 1, wherein the at least one friction surface has an annular shape, and the at least one cooling surface is provided in the annular shape of the at least one friction surface with respect to the rotational center axis. ### Claim 10 (depends on 1) The bicycle disc brake rotor according to claim 1, wherein the friction member includes an outer peripheral edge, and a maximum distance which is radially defined between the first inner peripheral edge and the second inner peripheral edge is longer than a maximum distance which is radially defined between the first inner peripheral edge and the outer peripheral edge. ### Claim 11 (depends on 1) The bicycle disc brake rotor according to claim 1, wherein the cooling member includes a center opening defined by the second inner peripheral edge. ### Claim 12 (depends on 11) The bicycle disc brake rotor according to claim 11, wherein the cooling member includes at least one opening provided radially outward of the center opening. ### Claim 13 (depends on 1) The bicycle disc brake rotor according to claim 1, wherein the friction member is made of a first material, and the cooling member is made of a second material different from the first material. ### Claim 14 (depends on 13) The bicycle disc brake rotor according to claim 13, wherein the first material has a first thermal conductivity, the second material has a second thermal conductivity, and the second thermal conductivity is larger than the first thermal conductivity. ### Claim 15 (depends on 14) The bicycle disc brake rotor according to claim 14, wherein the first material includes stainless steel, and the second material includes aluminum. ### Claim 16 (depends on 1) The bicycle disc brake rotor according to claim 1, wherein the friction member includes a first friction part including a first friction surface provided as the at least one friction surface, and a second friction part including a second friction surface provided as the at least one friction surface, the second friction surface being opposite to the first friction surface in the axial direction, the radially outer part is provided between the first friction part and the second friction part in the axial direction, the first friction part is attached to the radially outer part of the cooling member, and the second friction part is attached to the radially outer part of the cooling member. ### Claim 17 (depends on 1) The bicycle disc brake rotor according to claim 1, further comprising: a fastener provided at the coupling part, wherein the friction member is coupled to the hub attachment member with the fastener, and the second inner peripheral edge is provided radially inward of the fastener. ### Claim 18 (depends on 1) The bicycle disc brake rotor according to claim 1, wherein the hub attachment member overlaps with the friction member to define a first overlapping region when viewed from the axial direction, the hub attachment member overlaps with the at least one cooling surface to define a second overlapping region when viewed from the axial direction, and the second overlapping region is larger than the first overlapping region. ### Claim 19 (depends on 1) The bicycle disc brake rotor according to claim 1, wherein the second inner peripheral edge of the cooling member is offset from the radially outer part toward the hub attachment member in the axial direction. ### Claim 20 (depends on 1) The bicycle disc brake rotor according to claim 1, further comprising: a cooling material provided on the at least one cooling surface of the cooling member, wherein the cooling material has a thermal emissivity larger than a thermal emissivity of a material of the cooling member. ### Claim 21 (depends on 20) The bicycle disc brake rotor according to claim 20, wherein the cooling material covers the at least one cooling surface of the cooling member. ### Claim 22 A bicycle disc brake rotor comprising: a friction member including at least one friction surface and a first inner peripheral edge; a cooling member coupled to the friction member, the cooling member including an air intake including an opening facing toward a downstream side of a rotational direction with respect to a rotational center axis of the bicycle disc brake rotor, the cooling member including a second inner peripheral edge; and a hub attachment member coupled to the friction member at a coupling part, the hub attachment member including a hub engagement structure to engage with a bicycle hub assembly, the second inner peripheral edge being provided radially inward of the coupling part with being spaced apart from the hub attachment member in an axial direction parallel to the rotational center axis of the bicycle disc brake rotor. ### Claim 23 (depends on 22) The bicycle disc brake rotor according to claim 22, wherein the rotational direction of the bicycle disc brake rotor corresponds to a direction in which a hub shell of the bicycle hub assembly rotates when a bicycle moves forward. ### Claim 24 (depends on 22) The bicycle disc brake rotor according to claim 22, wherein the at least one friction surface has an annular shape, the cooling member includes at least one cooling surface, and the at least one cooling surface is provided in the annular shape of the at least one friction surface with respect to the rotational center axis. ### Claim 25 (depends on 22) The bicycle disc brake rotor according to claim 22, wherein the friction member includes an outer peripheral edge, and a maximum distance which is radially defined between the first inner peripheral edge and the second inner peripheral edge is longer than a maximum distance which is radially defined between the first inner peripheral edge and the outer peripheral edge. ### Claim 26 (depends on 22) The bicycle disc brake rotor according to claim 22, wherein the cooling member includes a center opening defined by the second inner peripheral edge. ### Claim 27 (depends on 26) The bicycle disc brake rotor according to claim 26, wherein the opening is provided radially outward of the center opening. ### Claim 28 (depends on 22) The bicycle disc brake rotor according to claim 22, wherein the friction member is made of a first material, and the cooling member is made of a second material different from the first material. ### Claim 29 (depends on 28) The bicycle disc brake rotor according to claim 28, wherein the first material has a first thermal conductivity, the second material has a second thermal conductivity, and the second thermal conductivity is larger than the first thermal conductivity. ### Claim 30 (depends on 29) The bicycle disc brake rotor according to claim 29, wherein the first material includes stainless steel, and the second material includes aluminum. ### Claim 31 (depends on 22) The bicycle disc brake rotor according to claim 22, wherein the friction member includes a first friction part including a first friction surface provided as the at least one friction surface, and a second friction part including a second friction surface provided as the at least one friction surface, the second friction surface being opposite to the at least one friction surface in the axial direction, the radially outer part is provided between the friction member and the second friction part in the axial direction, the first friction part is attached to the radially outer part of the cooling member, and the second friction part is attached to the radially outer part. ### Claim 32 (depends on 22) The bicycle disc brake rotor according to claim 22, further comprising: a fastener provided at the coupling part, wherein the friction member is coupled to the hub attachment member with the fastener, and the second inner peripheral edge is provided radially inward of the fastener. ### Claim 33 (depends on 22) The bicycle disc brake rotor according to claim 22, wherein the hub attachment member overlaps with the friction member to define a first overlapping region when viewed from the axial direction, the cooling member includes at least one cooling surface, the hub attachment member overlaps with the at least one cooling surface to define a second overlapping region when viewed from the axial direction, and the second overlapping region is larger than the first overlapping region. ### Claim 34 (depends on 22) The bicycle disc brake rotor according to claim 22, further comprising: a cooling material, wherein the cooling member includes at least one cooling surface, the cooling material is provided on the at least one cooling surface of the cooling member, and the cooling material has a thermal emissivity larger than a thermal emissivity of a material of the cooling member. ### Claim 35 (depends on 34) The bicycle disc brake rotor according to claim 34, wherein the cooling material entirely covers the at least one cooling surface of the cooling member. ### Claim 36 (depends on 27) The bicycle disc brake rotor according to claim 27, wherein the opening is at least partly provided radially inward of the coupling part.