Multi-speed transmission

Details Multi-speed transmission Multi-speed transmission

2007-02-09

2009-06-23

Lewis, Tisha D (Department: 3655)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

C475S276000

Reexamination Certificate

active

07549942

ABSTRACT:
The multi-speed transmission with nine forward gears and one reverse gear comprises four planetary gear sets (P1, P2, P3, P4), seven rotatable shafts (1, 2, 3, 4, 5, 6, 7), as well as six control elements (03, 04, 05, 15, 17, 36), wherein the input shaft (1) is connected to the carrier of the planetary gear set (P1) and can be connected via a clutch (15) to the shaft (5), which is connected to the carrier of the third planetary gear set (P3) and can be coupled to the housing (G), wherein the sun gear of the planetary gear set (P1) is connected to the housing (G), the shaft (4) is connected to the ring gear of the planetary gear set (P3) and to the sun gear of the planetary gear set (P4) and can be coupled to the housing (G), wherein the shaft (3) is connected to the ring gear of the planetary gear set (P2) and to the carrier of the planetary gear set (P4) and can be coupled to the housing (G), and the shaft (6) is permanently connected to the ring gear of the planetary gear set (P1) and to the sun gear of the planetary gear set (P3), wherein the shaft (7) is connected to the sun gear of the planetary gear set (P2) and the output shaft (2) is connected to the ring gear of the planetary gear set (P4) and to the carrier of the planetary gear set (P2), wherein a clutch (17) detachably connects the input shaft (1) to the shaft (7) and a clutch (36) detachably connects the shafts (3) and (6) to each other.

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