US 12,371,127 B1
Three-speed bicycle transmission structure and transmission method thereof
Shuhu Xu, Kunshan (CN); Xiangyu Yan, Kunshan (CN); and Junjian Zhao, Kunshan (CN)
Assigned to KUNSHAN ZHIHU INDUSTRIAL TECHNOLOGY CO., LTD., Kunshan (CN)
Filed by Kunshan Zhihu Industrial Technology Co. , Ltd., Kunshan (CN)
Filed on Jun. 6, 2024, as Appl. No. 18/735,810.
Int. Cl. B62M 11/16 (2006.01); F16H 57/08 (2006.01)
CPC B62M 11/16 (2013.01) [F16H 57/08 (2013.01); F16H 57/082 (2013.01); F16H 2200/0039 (2013.01); F16H 2200/2005 (2013.01); F16H 2200/2087 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A three-speed bicycle transmission structure, wherein the structure comprises a central shaft (1), a three-speed transmission structure and a gearbox housing (6), wherein:
the three-speed transmission, used for switching output modes and realizing three-speed gear shifting, comprises a centrifugal clutch shifting mechanism (2), a composite planetary gear ring (7) and a planetary transmission mechanism (31);
the composite planetary gear ring (7) comprises a first gear ring (71), a second gear ring (72) and a third gear ring (73) fixed to each other, and the three gear rings are arranged concentrically in the axial space of the transmission;
a tooth profile of the first gear ring is an involute gear, a tooth profile of the second gear ring is an inner ratchet tooth, and a tooth profile of the third gear ring is an outer ratchet tooth;
wherein the centrifugal clutch shifting mechanism (2) is used for converting output modes, and the composite planetary gear ring (7) and the planetary transmission mechanism (31) cooperate with the centrifugal clutch shifting mechanism (2) to realize partial gear shifting;
the gearbox housing (6) is used for outputting power.