Configuration for compact planetary transmission

摘要

A compact five-speed transmission planetary gear train includes a first, second, third, and fourth planetary gear sets between an input and an output as well as first, second, third, and fourth brakes and first and second clutches. The first, second, third and fourth brakes and first and second clutches are selectively actuatable to provide five different forward speeds and a four different reverse speeds between the input and the output. The compact transmission also includes a first brake, second brake, third brake, fourth brake, first clutch, and second clutch associated with the planetary gear train, the first brake, second brake, third brake, fourth brake, first clutch, and second clutch being configured such that setting each forward and reverse speed of the compact transmission is accomplished via actuation of two of the first brake, second brake, third brake, fourth brake, first clutch, and second clutch.

主权项

1. A machine power transmission comprising:
a planetary gear train having exactly four planetary gear sets including a first planetary gear set having a first sun gear, first ring gear, and first carrier, a second planetary gear set having a second sun gear, second ring gear, and second carrier, a third planetary gear set having a third sun gear, third ring gear, and third carrier, and a fourth planetary gear set having a fourth sun gear, fourth ring gear, and fourth carrier; an input to the planetary gear train and an output from the planetary gear train; and a first brake, second brake, third brake, fourth brake, first clutch, and second clutch associated with the planetary gear train, the first brake being linked to the first ring gear, the second brake being linked to the second carrier, the third brake being linked to the second ring gear and third ring gear, the fourth brake being linked to the fourth ring gear, the first clutch linking the first sun gear to the input, and the second clutch linking the fourth sun gear to the output, such that selective actuation of one or more of the first brake, second brake, third brake, fourth brake, first clutch, and second clutch provides five forward speeds and four reverse speeds of the transmission.