Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1975-09-04
1976-08-10
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
60487, 60489, F15B 1518
Patent
active
039734005
ABSTRACT:
The hydrostatic transmission includes a main pump having a plurality of reciprocating pistons projecting into and biased towards a drive chamber and has both its inlet and its drive chamber connected to a substantially constant pressure charge circuit. Displacement of the pump is controlled by controlling the fluid flowing from the charge circuit to the inlet. The pump outlet is connected to the drive chamber through a combined safety and inching valve which normally blocks fluid flow therebetween but which is responsive to excess pressure at the pump outlet to open and increase the pressure in the drive chamber. The valve is also manually operable through a pedal on the vehicle which can be used to destroke the pump in emergency situations or to provide inching control.
REFERENCES:
patent: 3188810 (1965-06-01), Kuze
patent: 3360933 (1968-01-01), Swanson et al.
patent: 3376703 (1968-04-01), Buczynski
patent: 3390523 (1968-07-01), Heidemann et al.
patent: 3398531 (1968-08-01), Swanson et al.
patent: 3667226 (1972-06-01), Asmus et al.
patent: 3675421 (1972-07-01), Asmus
patent: 3699677 (1972-10-01), Asmus
patent: 3699678 (1972-10-01), Swanson et al.
Deere & Company
Geoghegan Edgar W.
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