Parker-hannifin Corporation

Scania Cv Ab

Parker Hannifin Manufacturing Sweden Ab

Mikael Sannelius

Per-Ola Vallebrant

Tomas Selling

Elias Bartos

Arvid Rudberg

Petter Rybäck

Johnny Färm

A hydrodynamic retarder device for installation in a driveline to a vehicle, wherein the retarder device comprises: a blade-equipped stator which, together with a blade-equipped rotor, forms a blade system with a workspace for receipt of an aqueous working medium, and a retarder circuit connected to the workspace to control the inflow of a working medium to the workspace, wherein the retarder circuit is installed to be connected to the vehicle's ordinary cooling water circuit. The retarder circuit comprises valve elements to shut off the flow of working medium to the workspace, and a negative pressure generator is connected in the retarder circuit, which is installed to reduce the pressure in the workspace to or below the vapor pressure for the working medium, so that the workspace is thus evacuated of the liquid working medium. The invention also pertains to a method and a vehicle.

Hydrodynamic retarder device, method for its use together with a vehicle

The present invention relates to an arrangement for controlling a hydraulically driven motor, forming part of a hydraulic system in which hydraulic fluid under pressure forms a main flow through a main duct in which the motor is connected. The motor drives a varying load, and one or more valves () are adapted for controlling the hydraulic fluid flow through the motor on the one hand during operation and on the other hand for starting and stopping of the motor. One of the valves consists of a flow control valve () which is connected in the main duct () downstream of the outlet of the motor, and the flow control valve () is integrated with the motor housing ().

Arrangement for controlling a hydraulically driven motor

The present invention relates to an arrangement for controlling a hydraulically driven motor (), forming part of a hydraulic system in which hydraulic fluid under pressure forms a main flow through a main duct () in which the motor is connected. The motor is adapted to drive a load with varying loading, and one or more valves () are adapted for controlling the hydraulic fluid flow through the motor on the one hand during operation and on the other hand for starting and stopping of the motor. One of the valves consists of a flow control valve () which is connected in the main duct () downstream of the motor () and is adapted for on the one hand starting/stopping of the motor and on the other hand constant flow control of the hydraulic fluid flow through the motor.

Device for controlling a hydraulically driven motor

An arrangement for controlling two drive units which interact with one another, one of which includes a hydraulically driven motor (). The motor drives a varying load, and one or more valves () control hydraulic fluid flow through the motor during operation and for starting and stopping of the motor. One of the valves is a flow control valve () for flow control of the hydraulic fluid flow through the motor. The second drive unit () performs a working movement which, under the action of hydraulic flow influences the loading of the motor. The flow of the hydraulic fluid to the second drive unit is controlled in a coordinated way with the control of the flow through the motor.

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Älvsjö, Sweden

Mikael Sannelius