Four-speed transmission

Details Four-speed transmission Four-speed transmission

1975-08-21

1978-05-02

Wyche, Benjamin W.

Machine element or mechanism

Gearing

Plural power paths to and/or from gearing

74753, F16H 5710

Patent

active

040868273

ABSTRACT:
A four-speed planetary transmission providing two underdrive ratios, a direct drive ratio, an overdrive ratio and a reverse ratio is disclosed. Three selectively operable friction clutches and two friction brakes are provided to connect the transmission input to the planetary gearing arrangement and to establish the above speed ratios. One of the clutches has serially disposed therewith a one-way clutch which is operable on a 3-4 upshift or, a 4-3 downshift or, a 4-2 downshift to provide a controlled drive path so that simultaneous overlapping of other friction drive establishing devices in the transmission is avoided during these ratio changes.

REFERENCES:
patent: 2620685 (1952-12-01), Smirl
patent: 2813437 (1957-11-01), Kelbel et al.
patent: 3103832 (1963-09-01), Foerster
patent: 3483771 (1969-12-01), Forster et al.
patent: 3602055 (1971-08-01), Hause
patent: 3611835 (1971-10-01), Borman
patent: 3802294 (1974-09-01), Smirl

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