Patent · US Active

Multistage transmission

US8414446B2 · kind B2 · utility

80Cited by

0References

13Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Stefan Beck · Eriskirch, DE
Gerhard Gumpoltsberger · Friedrichshafen, DE
Hans-Peter Freudenreich · Griesingen, DE

Key dates

Filing date	Aug 19, 2011
Grant date	Apr 9, 2013
Priority date	—
Expiry date	Sep 30, 2031

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H2200/2097
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A multi-stage transmission (1) having a housing (9), a drive shaft (AN), an output shaft (AB), four planetary gear sets (RS1, RS2, RS3, RS4) each having first, second and third elements, at least eight rotatable shafts (1, 2, 3, 4, 5, 6, 7, 8), six shift elements, comprising four clutches (K1, K2, K3) and two brakes (B1, B2, B3). Selective engagement of the clutches and brakes results in different transmission ratios between the drive shaft (AN) and the output shaft (AB) so that up to nine forward gears can be implemented. The multi-stage transmission is delimited by the connections of the individual elements to each other and in that exactly three of the six shift elements are engage for gear step of the transmission.

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