Power plants – Pressure fluid source and motor – Having a mechanical clutch or brake device in the power train
Patent
1995-09-18
1996-07-30
Lopez, F. Daniel
Power plants
Pressure fluid source and motor
Having a mechanical clutch or brake device in the power train
60491, 475 76, 475 80, F16D 3102
Patent
active
055400515
ABSTRACT:
A control mechanism for a hydrostatic-mechanical power transmission system having a mechanical transmission unit driven through an input shaft connectable to a power source, and a hydrostatic transmission unit that is connectable to the input shaft and includes a pump and a motor each having a displacement setting swash plate. The control mechanism further includes a differential unit for connecting an output shaft to the mechanical transmission unit and the hydrostatic transmission unit to drive. At least either of the displacement setting swash plates is variable in angle. The control mechanism also includes a throttle position detector for detecting the position of a throttle in relation to the power source; a target motor speed ratio setting device for setting, based on the position of the throttle detected by the throttle position detector, a target motor speed ratio that is a target value for the ratio of the revolution speed of the motor in the hydrostatic transmission unit to the revolution speed of the power source; and a swash plate angle controller for controlling at least either of the angles of the displacement setting swash plates by feed-forward control in which the target motor speed ratio set by the target motor speed ratio setting device is used in such a way that the ratio of a displacement volume of the pump to a displacement volume of the motor is made to follow the target motor speed ratio.
REFERENCES:
patent: 3943715 (1976-03-01), Mivao et al.
patent: 4019404 (1977-04-01), Schauer
patent: 4246806 (1981-03-01), Mizuno et al.
patent: 4253347 (1981-01-01), Reynolds et al.
patent: 4497223 (1985-02-01), Maruyama et al.
patent: 4531431 (1985-07-01), Dreher et al.
patent: 4895049 (1990-01-01), Kita et al.
Ishino Tsutomu
Maruyama Ryoichi
Yamada Hideki
Komatsu Ltd.
Lopez F. Daniel
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