US 11,859,682 B2
Brake disc
Satoshi Kubota, Osaka (JP)
Assigned to SUNSTAR ENGINEERING INC., Osaka (JP)
Appl. No. 17/441,024
Filed by SUNSTAR ENGINEERING INC., Osaka (JP)
PCT Filed Mar. 2, 2020, PCT No. PCT/JP2020/008580
§ 371(c)(1), (2) Date Sep. 20, 2021,
PCT Pub. No. WO2020/195561, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-054376 (JP), filed on Mar. 22, 2019.
Prior Publication US 2022/0154791 A1, May 19, 2022
Int. Cl. F16D 65/12 (2006.01); B62L 1/00 (2006.01); F16D 65/02 (2006.01)
CPC F16D 65/12 (2013.01) [B62L 1/00 (2013.01); F16D 2065/1332 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A brake disc comprising:
an outer circumferential portion that serves as a sliding portion area of a brake pad and includes a waveform portion in which recessed portions and projecting portions are repeatedly formed over an outer circumference,
wherein in order for the outer circumferential portion to have substantially uniform heat capacity distribution in a circumferential direction and in a radial direction,
the outer circumferential portion is formed such that
a ratio of a maximum difference in heat capacities among a plurality of circumferential sections in the outer circumferential portion, which are sectioned at an equal angle in the circumferential direction, relative to a heat capacity of each circumferential section is equal to or less than a first predetermined ratio, and
a ratio of a maximum difference in heat capacities among a plurality of radial sections in the outer circumferential portion, which are sectioned to have an equal length in the radial direction, relative to a heat capacity of each radial section is equal to or less than a second predetermined ratio.