Speed changing gear device having two independent gear assemblie

Details Speed changing gear device having two independent gear assemblie Speed changing gear device having two independent gear assemblie

1990-01-04

1992-06-16

Braun, Leslie A.

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

475296, 475284, F16H 5710

Patent

active

051221039

ABSTRACT:
A speed changing gear device for an automatic transmission, comprising a main gear assembly for providing a plurality of operating positions, and an axiliary gear assembly for providing a direct drive position and a speed changing drive position. The main gear assembly includes a single-pinion type first planetary gear unit having a first sun gear, a first planetary gear, a first ring gear and a first carrier, and a single-pinion type second planetary gear unit having a second sun gear, a second planetary gear, a second ring gear and a second carrier. The auxiliary gear assembly includes a third planetary gear unit having a third sun gear, at least one third planetary gear, a third ring gear and a third carrier. The first carrier and second ring gear are fixed to each other, or selectively connected to each other by a first clutch. The first and second sun gears, and the first sun gear and second carrier are selectively connected to each other by a second and a third clutch, respectively. The first sun gear, second sun gear and second carrier are selectively inhibited from rotating by a first brake, and the second carrier is inhibited from rotating by a second brake.

REFERENCES:
patent: 3971267 (1976-07-01), Murakami et al.
patent: 4624154 (1986-11-01), Kraft et al.
patent: 4939955 (1990-07-01), Sugano

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