Vehicle transmission

Details Vehicle transmission Vehicle transmission

2008-03-25

2011-10-25

Estremsky, Sherry (Department: 3655)

Machine element or mechanism

Gearing

Interchangeably locked

Reexamination Certificate

active

08042419

ABSTRACT:
An outer circumference of a shift drum of a vehicle transmission is provided with at least one particular lead groove among multiple lead grooves which continuously extends beyond one circle of the shift drum. Two ends of the particular lead groove are arranged so as to be out of alignment with each other in the axial direction of the shift drum. A common shift position adapted to establish gear trains with two shift stages different from each other is set at one position corresponding to the two ends of the particular lead groove along the circumferential direction of the shift drum. The resulting configuration prevents an increase in the diameter of a shift drum and eliminates the significant change of the shape of a lead groove, even as the number of shift positions set on the shift drum is increased.

REFERENCES:
patent: 1257417 (1918-02-01), Sperry
patent: 2529379 (1950-11-01), Dumont
patent: 5590563 (1997-01-01), Kuwahata et al.
patent: 6370976 (2002-04-01), Doppling et al.
patent: 62-8683 (1987-02-01), None

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