Search International and National Patent Collections

1. (WO2010112390) HYDRAULIC TRANSMISSION CONTROL

Pub. No.:    WO/2010/112390    International Application No.:    PCT/EP2010/053889
Publication Date: Fri Oct 08 01:59:59 CEST 2010 International Filing Date: Fri Mar 26 00:59:59 CET 2010
IPC: F16H 61/00
F15B 11/028
F15B 13/043
F15B 13/042
Applicants: ZF FRIEDRICHSHAFEN AG
SCHMIDT, Thilo
GIERER, Georg
POPP, Christian
Inventors: SCHMIDT, Thilo
GIERER, Georg
POPP, Christian
Title: HYDRAULIC TRANSMISSION CONTROL
Abstract:
The invention relates to a hydraulic transmission control comprising at least one pressure control valve (1) and a pre-control valve (2) connected thereto by a pre-control line (35) and a pre-filling valve (3, 303). The pre-filling valve (3, 303) is for adjusting a pre-filling pressure (p_3) to prevent a draining of a clutch (20) and lines (231, 331) connected thereto in an operating state wherein the clutch (20) is not activated, wherein the pre-control line (35) is connected to at least one line (236', 238, 336, 338) that is under a second pre-filling pressure (p_3') likewise to prevent draining in said operating state.