US 12,000,472 B2
Sprocket
Satoshi Kubota, Osaka (JP); and Yuya Okuda, Shizuoka (JP)
Assigned to Sunstar Engineering Inc., Osaka (JP); and YAMAHA HATSUDOKI KABUSHIKI KAISHA, Shizuoka (JP)
Appl. No. 17/997,366
Filed by Sunstar Engineering Inc., Osaka (JP); and YAMAHA HATSUDOKI KABUSHIKI KAISHA, Shizuoka (JP)
PCT Filed Mar. 22, 2021, PCT No. PCT/JP2021/011629
§ 371(c)(1), (2) Date Oct. 27, 2022,
PCT Pub. No. WO2021/220664, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 2020-081000 (JP), filed on May 1, 2020.
Prior Publication US 2023/0204090 A1, Jun. 29, 2023
Int. Cl. F16H 55/30 (2006.01)
CPC F16H 55/30 (2013.01) 3 Claims
OG exemplary drawing
 
1. A sprocket comprising:
mounting holes arranged at equal intervals in a circumferential direction:
a plurality of sprocket teeth provided on an outer periphery:
first openings each having a substantially triangular shape two corners of which respectively face the mounting holes and a remaining one corner of which is located toward the outer periphery; and
second openings each having a substantially triangular shape one corner of which faces the mounting hole and remaining two corners of which are located toward the outer periphery,
the first and second openings defining therebetween first crossbars where a driving force and a load reaction force act toward each other and second crossbars where a driving force and a load reaction force act away from each other;
wherein an inclination angle at which a centerline of a minimum-width site of each first crossbar is inclined with respect to a radial direction is smaller than an inclination angle at which a centerline of a minimum-width site of each second crossbar is inclined with respect to a radial direction.