Zf Friedrichshafen Ag

Horst Roegner

Josef Haupt

Gabor Diosi

Markus Herrmann

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.

Hydraulic control device for an automatic transmission

An arrangement for supplying oil to a chain drive which drives a transmission oil pump that is axially offset relative to a torque converter and embedded in an intermediate plate in a vehicle having a torque converter. The driven sprocket of the chain drive is supported by a converter neck mounted in a centering plate. A seal is provided between the converter neck and the sprocket and is arranged adjacent the sliding fit between the converter neck and the sprocket. To compensate for the suppression of lubrication of the seal, the neck bearing and the chain drive, a valve is integrated in the intermediate plate, and a duct is provided in the plane, in which the centering plate is screwed to the intermediate plate, such that excess oil flowing from the valve is selectively directed to the seal, the neck bearing and the chain drive.

Arrangement for lube oil supply a chain drive driving a transmission oil pump arranged offset the axis of a torque converter

A transmission for a vehicle with a clutch and/or a brake which is hydraulically actuated by a cylinder and a piston actuator. A pressure chamber is located between the cylinder and the piston and a hydraulic pressure medium flows into the pressure chamber via an inlet. The pressure medium is supplied to the pressure chamber via a component fixed on the housing, a rotary passage between the fixed component and the rotatable component and then via the rotatable component. The radial distance of the radial middle of the rotary passage is larger than the smallest radial distance and smaller than the largest radial distance of the pressure chamber from the rotation axis of a central shaft of the automatic transmission. The radial arrangement of the rotary passage, between the radially smallest and largest diameters of the pressure chamber, neutralizes centrifugally generated forces on the pressure medium in the pressure chamber.

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Oberteuringen, Germany

Horst Roegner