Patent number: 8840519
Abstract: 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.
Type:
Grant
Filed:
August 6, 2012
Date of Patent:
September 23, 2014
Assignee:
Caterpillar Inc.
Inventors:
Thomas D. Koch, Justin Floro, Michael Gross, Kevin G. Meyer, Kevin J. Knox, James Rice, James Elmer Winzeler, Peter H. Hodges, Perry G. Cruce