Automatic transmission

Details Automatic transmission Automatic transmission

1987-08-06

1990-04-17

Diehl, Dwight G.

Planetary gear transmission systems or components

Variable speed or direction transmission combined with...

Variable speed or direction is planetary transmission

475283, F16H 3708

Patent

active

049169777

ABSTRACT:
Automatic transmission including a main-transmission-mechanism consisting of two planetary gear units (three speed or four speed transmission mechanism for example) and a sub-transmission-mechanism consisting of one planetary gear unit (underdrive mechanism, for example). One speed and two speed for the whole transmission are obtained, with a low speed stage of the main-transmission-mechanism lower than two speed, by shifting the main-transmission-mechanism to one and two speed, respectively, while the sub-transmission-mechanism is kept at low speed (underdrive). And three speed for the whole transmission is obtained by shifting the sub-transmission-mechanism to high speed (direct coupling) while the main-transmission-mechanism is left at the two speed state. Further, four speed or five speed for the whole is obtained by shifting the main-transmission-mechanism to three speed or, if it is of four speed type, to four speed, respectively, while the sub-transmission-mechanism is kept at the high speed state.

REFERENCES:
patent: 2894415 (1959-07-01), Miller
patent: 3877320 (1975-04-01), Iijima
patent: 4258586 (1981-03-01), Numazawa et al.
patent: 4528869 (1985-07-01), Kubo et al.
patent: 4537092 (1985-08-01), Morisawa
patent: 4594914 (1986-06-01), Kubo et al.
patent: 4711138 (1987-12-01), Miura et al.
patent: 4716787 (1988-01-01), Miura et al.
patent: 4722242 (1988-02-01), Miura et al.
patent: 4813301 (1989-03-01), Aoki
patent: 4817462 (1989-04-01), Dach et al.
patent: 4833943 (1989-05-01), Buckseh
RT-910 10-Speed Road Ranger and Family of Twin Countershaft Transmissions, Eaton Manu. Co. 1962 (p. 4).

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