Patent · US Active

Hydraulic control device for an automatic transmission

US9995384B2 · kind B2 · utility

1Cited by

5References

17Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Markus Herrmann · Scheidegg, DE
Josef Haupt · Tettnang, DE
Horst Roegner · Markdorf, DE

Key dates

Filing date	Jul 21, 2015
Grant date	Jun 12, 2018
Priority date	—
Expiry date	Jul 21, 2035

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16D2500/108
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A hydraulic control device for an automatic transmission includes a shut-off valve arranged between a first pressure adjusting device and a respective shifting element cylinder of a plurality of shifting elements. In the first shifting position of the shut-off valve, the first pressure adjusting device is hydraulically connected to the respective shifting element cylinder through the shut-off valve. In the second shifting position of the shut-off valve, the shifting element cylinder is sealed by the shut-off valve relative to the first pressure adjusting device. The shut-off valve is an releasable check valve. The releasable check valve includes a check valve and an unblocking device. The unblocking device is actuatable by a control pressure from a second pressure adjusting device.

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