Motor vehicles – Having four wheels driven – Including pump and fluid motor – or generator and electric...
Patent
1995-03-17
1997-11-18
Boehler, Anne Marie
Motor vehicles
Having four wheels driven
Including pump and fluid motor, or generator and electric...
180242, 180307, B60K 17356
Patent
active
056878087
ABSTRACT:
A torque is transmitted between a fluid pressure pump driven together with drive of a vehicle, and a fluid pressure motor that rotates together with driven wheels. The fluid pressure motor has two ports, and rotates in accordance with the direction of fluid supply to the ports. Fluid is circulated from one port to the other according to the input of rotation torque from the driven wheels. A high pressure flowpath connected to the pump outlet, and a low pressure flowpath connected to the pump inlet, are connected to these ports, and the connection direction is reversed when the rotation direction of the drive wheels is reversed. The low pressure flowpath is therefore always at low pressure regardless of the rotation direction of the drive wheels, and by controlling the pump supply flowrate so as not to exceed a predetermined value, torque is not transmitted when the vehicle is running at high speed.
REFERENCES:
patent: 3811525 (1974-05-01), Stuart
patent: 3994353 (1976-11-01), Greene
patent: 4480502 (1984-11-01), Nembach
patent: 4667763 (1987-05-01), Nembach
patent: 5368120 (1994-11-01), Sakai
patent: 5540299 (1996-07-01), Tohda
Inoue Naohiko
Kamegaya Shigeru
Nakao Yorihito
Takahashi Kenro
Watanabe Jun
Boehler Anne Marie
Nissan Motor Co,. Ltd.
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