Patent · US Active

Compact multi-speed automatic transmission

US8343007B2 · kind B2 · utility

52Cited by

6References

16Claims

0Family size

Assignee

GM GLOBAL TECHNOLOGY OPERATIONS LLC · US

Inventors

James M. Hart · Belleville, US
Scott H. Wittkopp · Ypsilanti, US
Bret M. Olson · Kalamazoo, US

Key dates

Filing date	Jan 31, 2011
Grant date	Jan 1, 2013
Priority date	—
Expiry date	Jul 9, 2031

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H2200/2053
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

An automatic transmission includes an input shaft, an output shaft and four planetary gear assemblies each having a first, a second and a third element. The automatic transmission includes six fixed or rigid interconnections: one from a third element of the second planetary gear assembly to a second element of the fourth planetary gear assembly, one from a second element of the third planetary gear assembly to the second element of the fourth planetary gear assembly, one from a third element of the first planetary gear assembly to a second element of the second planetary gear assembly, one from a third element of the third planetary gear assembly to a first element of the fourth planetary gear assembly and one from an element of the second planetary gear assembly to an element of the first planetary gear assembly. The automatic transmission also includes four clutches and three brakes which may be selectively engaged to provide nine, ten or eleven speed transmission operation.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.