Drive unit with an engine and a retarder

Details Drive unit with an engine and a retarder Drive unit with an engine and a retarder

1997-04-25

1998-08-18

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Responsive to deceleration mode

F02D 3902

Patent

active

057945888

ABSTRACT:
A drive unit includes a hydrodynamic retarder having a rotor paddle wheel, a stator paddle wheel, and a housing surrounding the rotor and stator wheels. The unit includes a coolant cycle system for an internal combustion engine, the coolant for this coolant cycle also being a working medium of the retarder. The drive unit further includes a working medium container for the coolant. A first pipe connects a hydrodynamic center of the retarder to a valve. A second, leakage pipe is disposed between a working medium outlet of the retarder and the valve. A third pipe is disposed between the valve and the working medium container. The valve is designed such that in a first position, a conducting connection is established between the working medium container and the leakage pipe to provide for a pumping operation of the retarder. When the valve is in a second position, a conducting connection is established between the working medium container and the first pipe for a braking operation of the retarder.

REFERENCES:
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European Search Report of European Application 97 10 4907.7, Applicant: Voith Turbo GmbH & Co. KG.
Abstract of German Publication No. 2 150 115 obtained from Derwent World Patent Index.
Abstract of French Publication No. 2 383 053 obtained from Derwent World Patent Index.

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