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:
Feb. 26, 2008
Filed:
Feb. 16, 2007
Peter Tiesler, Meckenbeuren, DE;
Peter Ziemer, Tettnang, DE;
Peter Tiesler, Meckenbeuren, DE;
Peter Ziemer, Tettnang, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A multi-stage automatic transmission comprises a drive input shaft (AN), a drive output shaft (AB), three planetary gearwheel assemblies (RS, RS, RS) arranged next to one another in series and five shift control elements (A to E). A sun gearwheel (SO) of the third planetary gearwheel assembly (RS) can be fixed relative to a transmission housing (GG) by means of the first shift control element (A). The drive input shaft (AN) is connected to a sun gearwheel (SO) of the second planetary gearwheel assembly (RS) and can be connected via the second shift control element (B) to a sun gearwheel (SO) of the first planetary gearwheel assembly (RS) and/or via the fifth shift control element (E) to a web (ST) of the first planetary gearwheel assembly (RS). Alternatively, the sun gearwheel (SO) of the first planetary gearwheel assembly (RS) can be fixed via the third shift control element (C) and/or the web (ST) of the first planetary gearwheel assembly (RS) via the fourth shift control element (D) relative to the transmission housing (GG). The drive output shaft (AB) is connected to an annular gearwheel (HO) of the first planetary gearwheel assembly (RS) and to one of the webs (ST, ST) of the second or third planetary gearwheel assemblies (RS, RS). The second and fifth shift control elements (B, E) form a structural group, each with a disk pack (), and each with a servo device (), and a disk support (ZYLBE) common to the two shift control elements (B, E). The disk pack () of the second shift control element (B) has a larger diameter than the disk pack () of the fifth shift control element (E).