Patent · US Expired

Device for controlling an automatic transmission

US7338402B2 · kind B2 · utility

3Cited by

9References

7Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Adolf Bucher · Kreßbronn, DE
Anton Fritzer · Markdorf, DE
Tobias Pfleger · Markdorf, DE

Key dates

Filing date	May 7, 2004
Grant date	Mar 4, 2008
Priority date	—
Expiry date	Dec 27, 2024

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H2061/1204
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A device for the hydraulic control of an automatic transmission, especially a continuously variable automatic transmission. The control system comprises a forward/reverse drive unit (4), which is controlled by way of at least a first and a second shifting component (5, 6). The shifting components (5, 6) are in turn controlled via at least two valves (7, 8, 17, 18, 20, 21), which are pressurized by way of a pressurized medium pump (9). A gear selector device (15) selection is made among at least a forward gear (D), a neutral gear (N) and a reverse gear (R), wherein the selector device (15) possesses a non-mechanical connection to the transmission control system.

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