Internal-combustion engines – Cooling – Automatic coolant flow control
Patent
1988-06-21
1990-07-17
Kamen, Noah P.
Internal-combustion engines
Cooling
Automatic coolant flow control
123 4149, 60456, 60468, F01P 702
Patent
active
049414372
ABSTRACT:
An automotive radiator cooling system has a radiator cooling fan driven by a hydraulic motor actuated by a pressurized fluid fed through a hydraulic circuit from an engine-driven hydraulic pump. A bypass line extends in bypassing relationship to the hydraulic motor and has ends connected to the circuit upstream and downstream of the hydraulic motor, respectively. A check valve is provided in the bypass line and is operative to allow a flow of the fluid from a reservoir through the bypass line back into a part of the circuit upstream of the motor only when a pressure drop takes place in that part of the circuit due to free rotation of the cooling fan, and thus of the motor, independently of the drive by the hydraulic pump. The backward flow of the fluid is operative to compensate for the pressure drop to prevent the occurrence of cavitation in the circuit upstream of the motor. Desirably, the bypass line is incorporated into the housing of the hydraulic motor.
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Masui Atusi
Ohshima Toshihiro
Setoguchi Tadashi
Sugiyama Toshiki
Suzuki Yasushi
Kamen Noah P.
Nippondenso Co. Ltd.
Toyota Jidosha & Kabushiki Kaisha
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