Speed change mechanism of automatic transmission

Details Speed change mechanism of automatic transmission Speed change mechanism of automatic transmission

2005-04-12

2005-04-12

Wright, Dirk (Department: 3681)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

Reexamination Certificate

active

06878087

ABSTRACT:
A single pinion type planetary gear unit and a double sun gear type planetary gear units are coaxially arranged on different positions of a given axis of an input shaft. First and second brakes are coaxially arranged on different positions of the given axis. The first brake selectively fixes a carrier of the double sun gear type planetary gear unit and the second brake selectively fixes an outer one of the sun gears of the double sun gear type planetary gear unit. First and second clutches are coaxially arranged on different positions of the given axis to transmit a speed changed rotation to rotational elements of the two planetary gear unit to provide an associated automatic transmission with a desired speed. The first clutch transmits the speed changed rotation to the ring gear of the single pinion type planetary gear unit, and the second clutch transmits the speed changed rotation to the sun gear of the single pinion type planetary gear unit. The first and second clutches are coaxially arranged in the vicinity of the single pinion type planetary gear unit having the second clutch positioned in a space defined between the first clutch and the input shaft.

REFERENCES:
patent: 20030224899 (2003-12-01), Ishimaru et al.
patent: 2000-55152 (2000-02-01), None
U.S. Appl. No. 10/619,724, filed Jul. 16, 2003, Ishimaru.
U.S. Appl. No. 10/614,827, filed Jul. 9, 2003, Tsuga.
U.S. Appl. No. 10/619,559, filed Jul. 16, 2003, Taguchi.
U.S. Appl. No. 10/617,788, filed Jul. 14, 2003, Choi.
U.S. Appl. No. 10/619,459, filed Jul. 16, 2003, Ishimaru.
U.S. Appl. No. 10/617,787, filed Jul. 14, 2003, Ikeda.

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