Power plants – Pressure fluid source and motor – Servo-motor having externally operated control valve sets...
Patent
1996-12-11
1999-03-02
Lopez, F. Daniel
Power plants
Pressure fluid source and motor
Servo-motor having externally operated control valve sets...
60443, 60486, 91 48, 91 51, F16D 3102
Patent
active
058756310
ABSTRACT:
A hydrostatic transmission has a pair of overcenter variable displacement pumps, each having a flow control element controlled by a double acting actuator to control direction and flow rate of the pump. Fluid pressure in first and second chambers of each actuator are equal at a neutral position of the transmission. A forward control valve controllably communicates the first chambers of both actuators to a tank through a first orifice to reduce the pressure in the first chambers to simultaneously move the flow control elements in a first direction for forward travel. A reverse control valve controllably communicates the second chambers of both actuators to the tank through a second orifice to reduce the pressure in the second chambers to simultaneously move the flow control elements in a second direction for reverse travel. A right turn is made by selectively reducing the pressure in the second chamber of the right actuator during forward travel and in the first chamber during reverse travel by establishing fluid flow to the tank from the first or second chamber through a right turn position diverter valve and a right turn control valve. A left turn is made by selectively reducing the pressure in the second chamber of the left actuator during forward travel and in the first chamber during reverse travel by establishing fluid flow to the tank from the first or second chamber through one of another pair of orifices and a left two position diverter valve with a left turn control valve.
REFERENCES:
patent: Re27488 (1972-09-01), Lauck
patent: 3805676 (1974-04-01), Hamma et al.
patent: 4076090 (1978-02-01), Krusche et al.
patent: 4203290 (1980-05-01), Burchardt
patent: 4211256 (1980-07-01), Sturtz
patent: 4376371 (1983-03-01), Kojima et al.
patent: 4395878 (1983-08-01), Morita et al.
patent: 4599855 (1986-07-01), Seelman
patent: 4949823 (1990-08-01), Coutant et al.
patent: 4955442 (1990-09-01), Crabb et al.
Caterpillar Inc.
Grant John W.
Lopez F. Daniel
LandOfFree
Control system for a hydrostatic transmission does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control system for a hydrostatic transmission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control system for a hydrostatic transmission will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-413084