Thermostatically controlled hydraulic fan clutch
AssigneeTewig GmbH Technische Entwicklungs-Gesellschaft
InventorK. Gerd Friedrichs
Life of this patent
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Abstract
A fan for cooling an engine is adjusted as a function of the engine speed. The fan has a hydraulic clutch in which a sliding adjustment is made as a function of the temperature of the engine coolant. The drive shaft of the hydraulic clutch is designed as a hollow shaft in which the coolant circulates. The hollow shaft also contains a thermostat which actuates the tappet of a valve in the hydraulic clutch to regulate the flow. The valve is preferably designed as a disk valve in contact with the return openings of the hydraulic clutch. In order to cool the hydraulic clutch, the pump wheel is designed as a hollow body which communicates with the liquid circulating in the hollow shaft.
Claims13
A fan-hydraulic coupling for a water-cooled motor, comprising:
- a hollow drive shaft connected at a first end to a cooling liquid circuit of the motor and at a second end to the hydraulic coupling for cooling the hydraulic coupling, an interior of said hydraulic coupling being connected to said hollow drive shaft through radial hollow shaft openings for exchanging cooling liquid;
- and
- a pump impeller designed as a cooling body and partially defining a hollow body, said hollow body defining a hollow space within said pump impeller which is connected to said hollow drive shaft through said radial hollow shaft openings.
The hydraulic coupling according to one of the preceding claims, wherein said hollow drive shaft comprise at least two axial passage means for the cooling liquid which are formed by a pipe piece having radial spacers inserted into said hollow drive shaft.
Dependencies are inferred from the claim text.