Patent Number: 6,530,858

Title: Family of multi-speed planetary power transmission mechanisms having three planetary gearsets

Abstract: A family of power transmissions, which are utilized in a powertrain, include three planetary gearsets and five torque-transmitting mechanisms. The torque-transmitting mechanisms are either five rotating type torque-transmitting mechanisms or four rotating type torque-transmitting mechanisms and one stationary type torque-transmitting mechanism. Each of the three planetary gearsets all include three members represented by a sun gear member, a ring gear member, and planet carrier assembly member. The planet carrier assembly member may be of either the single pinion or double pinion. In each of the family members, at least four of the planetary members are interconnected continuously with either another planetary member, the input shaft, the output shaft, or a stationary housing of the transmission. At least four of the planetary members are noncontinuously interconnected with another planetary member, the input shaft, the output shaft, or the stationary housing. However, these four members are selectively interconnectible with other members through the use of the torque-transmitting mechanisms. In each family member the torque-transmitting mechanisms are engaged in combinations of three to establish at least six forward speed ratios and the one reverse speed ratio between the input shaft and the output shaft.

Inventors: Usoro; Patrick Benedict (Troy, MI), Kao; Chi-Kuan (Troy, MI), Raghavan; Madhusudan (West Bloomfield, MI)

Assignee: General Motors Corporation

International Classification: F16H 3/44 (20060101); F16H 3/66 (20060101); F16H 003/62 ()

Expiration Date: 03/11/2020