Patent · US Active

Multistage transmission

US8430785B2 · kind B2 · utility

79Cited by

4References

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 30, 2013
Priority date	—
Expiry date	Nov 12, 2031

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H2200/2046
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

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

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