Patent Number: 7,824,298

Title: 8-speed transmission with two fixed interconnections

Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes three planetary gear sets having six torque-transmitting mechanisms and two fixed interconnections. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The six torque-transmitting mechanisms provide interconnections between various gear members, and with the transmission housing, and are operated in combinations of three to establish at least eight forward speed ratios and at least one reverse speed ratio.

Inventors: Hart; James M. (Belleville, MI), Phillips; Andrew W. (Saline, MI), Carey; Clinton E. (Monroe, MI), Wittkopp; Scott H. (Ypsilanti, MI), Raghavan; Madhusudan (West Bloomfield, MI)

Assignee: GM Global Technology Operations, Inc.

International Classification: F16H 3/62 (20060101)

Expiration Date: 2019-11-02 0:00:00