Patent · US Expired

Hydraulic control systems for transmissions

US5101942A · kind A · utility

9Cited by

4References

7Claims

0Family size

Assignee

VOLKSWAGEN AKTIENGESELLSCHAFT · DE

Inventors

Ludwig Pruss · Braunschweig, DE
Gunter Uhlig · Gifhorn, DE
Fritz Blumenstein · Wolfsburg, DE

Key dates

Filing date	May 9, 1991
Grant date	Apr 7, 1992
Priority date	—
Expiry date	May 9, 2011

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T74/19251
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

In the embodiments described in the specification, a hydraulic control system for supplying pressure to a plurality of servo motors associated with shift elements of the several speeds of a transmission includes a slide valve having three positions arranged so that, in each position, two of the servo motors at a time are connectable alternatively with two separate pressure medium delivery lines. Valves are provided in the pressure medium delivery lines for alternate connection of the lines to a central pressure medium supply line.

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