Title:
トルク伝達機構を内蔵する自転車用クランク組立体
Document Type and Number:
Japanese Patent JP7108999
Kind Code:
B2
Abstract:
To provide a bicycle crank assembly which is excellent in torque transmission property from a crank to a sprocket, and which has high durability with a simple structure.SOLUTION: A bicycle crank assembly comprises: a crank shaft with an internal space, provided with an opening part at one end part; a crank arm mounted to the end part of the crank shaft; a torque transmission mechanism which includes a slide shaft built in the internal space of the crank shaft and provided with a plurality of rows of groove parts extending in the axial direction of the crank shaft on an outer peripheral surface, and which includes a plurality of rolling bodies accommodated in the respective plurality of rows of groove parts of the slide shaft; and a sprocket mounted around the slide shaft in the torque transmission mechanism. In the bicycle crank assembly, the number of the rows is five or less in the rows of groove parts extending on the outer peripheral surface of the slide shaft in the torque transmission mechanism.SELECTED DRAWING: Figure 2
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Inventors:
Hiroto Fukudome
Noriyoshi Hara
Noriyoshi Hara
Application Number:
JP2018049374A
Publication Date:
July 29, 2022
Filing Date:
March 16, 2018
Export Citation:
Assignee:
HEPHAIST Co., Ltd.
SHIMANO INC.
SHIMANO INC.
International Classes:
B62M3/00; F16D1/02; F16D3/06
Domestic Patent References:
| JP2017109529A | ||||
| JP61211527A | ||||
| JP2001050293A | ||||
| JP2007008286A |
Foreign References:
| US20130008282 |
Attorney, Agent or Firm:
Yasuo Yanagawa