The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 04, 2017
Filed:
May. 07, 2015
Zf Friedrichshafen Ag, Friedrichshafen, DE;
Stefan Beck, Eriskirch, DE;
Christian Sibla, Friedrichshafen, DE;
Josef Haupt, Tettnang, DE;
Martin Brehmer, Tettnang, DE;
ZF FRIEDRICHSHAFEN AG, Friedrichshafen, DE;
Abstract
An automatic transmission includes nine rotatable shafts and four planetary gear sets, each with a first, second and third element. For the shifting of multiple forward gears and one reverse gear, seven shift elements are provided. The second element of the fourth planetary gear set forms the first shaft designed as a drive shaft, the second element of the third planetary gear set forms the second shaft designed as an output shaft, the first element of the fourth planetary gear set forms the third shaft, one element of the planetary gear set forms the fourth shaft, the third element of the third planetary gear set forms the sixth shaft, the second element of the second planetary gear set forms the eighth shaft. The third element of the second planetary gear set and the first element of the third planetary gear set are connected to each other as the fifth shaft. The first element of the second planetary gear set and the third element of the fourth planetary gear set are connected to each other as the seventh shaft. The third shaft can be fixed through the first shift element. The fourth shaft is constantly and directly connected to the second shift element. The first shaft is connectable to the fifth shaft through the third shift element. The ninth shaft is not directly connected to any of the planetary gear sets, is connectable to the sixth shaft through the fourth shift element, is connectable to the seventh shaft through the fifth shift element, is connectable to the eighth shaft through the sixth shift element and is connectable to the first shaft through the seventh shift element.