FOUR PLANETARY-GEARSET STEP-RATIO AUTOMATIC TRANSMISSION

摘要

A four gearing-arrangement transmission having six shift-elements cooperatively engaging in combinations of three to provide nine forward speeds and one reverse speed. The transmission having a first gearing-arrangement with an end-gear fixedly coupled to a ground. A second gearing-arrangement with one end-gear fixedly coupled to an input and the other end-gear fixedly coupled to an interior-gear of the first gearing-arrangement. A third gearing-arrangement having an interior-gear fixedly coupled to an output. A fourth gearing-arrangement having a fourth interior-gear fixedly coupled to the input.

主权项

1. A transmission comprising:
four planetary-gearsets each having gear-elements including a sun, a carrier, and a ring, wherein the first planetary-gearset sun is fixedly coupled to a ground and the first planetary-gearset carrier is fixedly coupled to the second planetary-gearset ring; a first shift-element selectively coupling the second planetary-gearset carrier to the ground; a second shift-element selectively coupling the first planetary-gearset ring to a first one of the third planetary-gearset gear-elements; an input fixedly coupled to the second planetary-gearset sun and to a first one of the fourth planetary-gearset gear-elements; and an output fixedly coupled to a second one of the third planetary-gearset gear-elements.