Four speed ratio automatic power transmission

Details Four speed ratio automatic power transmission Four speed ratio automatic power transmission

1988-06-23

1989-12-05

Braun, Leslie A.

Machine element or mechanism

Gearing

Plural power paths to and/or from gearing

74759, 74762, 74763, F16H 5710

Patent

active

048844713

ABSTRACT:
A multiple speed transmission for an automotive vehicle includes three simple planetary gear units and clutches and brakes applied and released selectively to produce four forward speed ratios and reverse drive. Two of the gears units produce three of the four drive torque delivery paths and the reverse drive torque delivery path. A third gear unit, located between a torque converter and the first and second gear units, produces an overdrive speed ratio. A coast clutch is engaged to produce an engine braking effect in each of three manually selected speeds; an overdrive brake produces engine braking in the fourth speed automatic range.

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patent: 4649763 (1987-03-01), Graef et al.
patent: 4753132 (1988-06-01), Sumiya et al.

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