Deere + Company

Helmut Sch&auml;fer

Bruno Hoess

Nicolai Tarasinski

Timothy Joel Kilworth

Uwe H Kugler

Peter Leslie Falck

Klaus Zahn

Manfred Rimkus

Michael Poehlman

Peter M&uuml;nch

A venting or pressure release system releases pressure from a transmission housing through which extends a transmission shaft. A lower part of the transmission housing forms a collector in which fluid collect. A conduit communicates the collector with a storage container which is substantially sealed against the transmission housing. An overpressure in the transmission housing forces fluid from the collector through the conduit into the storage container. A pressure-release conduit communicates the transmission housing above the collector to the storage container. A shutoff device closes the pressure-release conduit when the transmission shaft is rotating and opens the pressure-release conduit when the transmission shaft is not rotating. This makes possible a rapid compensation of fluid after the transmission has been turned off so that the fluid level can be reliably determined. The shutoff device may be a pilot-controlled valve or a fluid barrier.

Pressure-release device for a transmission housing

A control device for the parking brake of a motor vehicle has a hydraulic cylinder with a piston chamber that can be pressurized by means of a valve arrangement, and has a hydraulic piston connected mechanically to engagement elements of the parking brake. The parking brake is forced into an engaged or disengaged position depending on the hydraulic pressure in the piston chamber. The piston chamber connects to a pressure sensor providing pressure signals that represent the state of the parking brake and that are evaluated by an electrical control unit. The control unit defines a first predetermined pressure threshold corresponding to the engaged state of the parking brake, and a second predetermined pressure threshold corresponding to the disengaged state of the parking brake.

Motor vehicle parking brake control device

An emergency release device for the parking lock of a motor vehicle is described which contains an locking device ( ) that is pressed into its engaged position by a spring element ( ) and which can move into its disengaged position by at least one actuator ( ) that is actuated by a control element ( ) against the spring force. The locking device ( ) can be linked with a clutch pedal located on the operator's station by releasable mechanical connecting elements ( ), in such a way that it is possible to emergency-release the parking lock in case of vehicle malfunction.

Parking lock for a motor vehicle with an emergency release device

A control device for the parking lock of a motor vehicle has at least one actuating drive ( ) that can be operated by triggering devices and with which a locking device ( ) can be moved between engaged and disengaged positions. For reliable operation, at least two independent triggering devices are provided and a change in position takes place only if both triggering devices ( ) are actuated. Preferably a hydraulic piston ( ) brings the parking lock into its disengaged position when subjected to pressure. The triggering devices are constructed as solenoids ( ) under the control of two electrical controllers ( ) that undertake an evaluation of relevant control and measurement parameters.

Growing community of inventors

Ketsch, Germany

Helmut Schäfer

Growing community of inventors

Ketsch, Germany

Helmut Sch&auml;fer

Helmut Schäfer