Change-speed gear system for use in automatic transmissions

Details Change-speed gear system for use in automatic transmissions Change-speed gear system for use in automatic transmissions

1976-04-15

1977-12-20

Bentley, Stephen C.

Machine element or mechanism

Gearing

Plural power paths to and/or from gearing

74767, F16H 5710

Patent

active

040634680

ABSTRACT:
A change-speed gear system for use in an automatic transmission, which includes a center output shaft, hollow input and intermediate shafts coaxially disposed around the center output shaft, first and second planetary gear mechanisms, first and second selectively actuatable clutches, and first and second selectively actuatable brakes.
Sun gears of the two planetary gear mechanisms are secured to the intermediate shaft while the planetary carrier and the ring gear respectively of the first and second planetary gear mechanisms are secured to the output shaft.
Driving portions of the two clutches are coupled to the input shaft while drivable portions of the first and second clutches are respectively coupled to the ring gear of the first planetary gear mechanism and to the intermediate shaft. Movable portions of the first and second brakes are respectively coupled to the intermediate shaft and to the planetary carrier of the second planetary gear mechanism. The above arrangement not only provides a change-speed gear system which has three forward-speed gear ratios and one reverse-speed ratio by selective actuation of the clutches and brakes, but also provides a change-speed gear system which allows the automatic transmission to be alternatively used in various types of vehicular drive systems such as front-engine and front-wheel drive and rear-engine and rear-wheel drive.

REFERENCES:
patent: 3418871 (1968-12-01), Cartwright et al.
patent: 3924491 (1975-12-01), Kalversberg

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