The invention provides a drum shell of an internal three-speed transmission of a bicycle. The drum shell is integrally fine cast with an inner ratchet wheel and an end cover; a center shaft sleeve for supporting an axle is arranged on the end cover. As the drum shell of the internal three-speed transmission is integrally fine cast with the inner ratchet wheel and the end cover, compared with the prior art, the parts of the drum shell of the internal three-speed transmission can be manufactured and assembled simply; as a result, the accuracy of the parts can be improved, and the manufacturing steps can be reduced so that the production cost can be decreased. The drum shell of the internal three-speed transmission of the bicycle has the outstanding advantages that the mature fine casting process is utilized thoroughly and the manufacturing steps of the internal three-speed transmission are simplified.
Drum shell of internal three-speed transmission of bicycle
2015-08-19
Patent
Electronic Resource
English
IPC: | B60B VEHICLE WHEELS , Räder für Fahrzeuge |
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