Control apparatus for several drive assemblies consisting of hyd

Details Control apparatus for several drive assemblies consisting of hyd Control apparatus for several drive assemblies consisting of hyd

1984-05-23

1985-10-01

Freeh, William L.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

91506, F04B 106

Patent

active

045443300

ABSTRACT:
A control apparatus for several drive assemblies, which consist of hydrostatic drive units, is described. The hydraulic pumps of the hydrostatic drives are driven by means of a common prime mover and are controlled in terms of output. The output control device consists of an adjusting piston, which is connected with the control element of the hydraulic pumps and upon both sides of which pressure acts, and of a spool valve which controls the pressure action on both pressure chambers at the front surfaces of the adjusting piston and upon which, on one side, the working pressure of the pumps acts and upon which, on the other side, an adjustable spring acts. In order to give priority to one of the hydraulic pumps or one of the drive assemblies and to allow sufficient output to come from the driving engine in each operating condition, there is provided a measuring piston upon which the working pressure of the priority hydraulic pump acts and which presses on a first lever which counteracts the force of the adjustable spring acting upon the spool valve of the output control apparatus.

REFERENCES:
patent: 3407738 (1968-10-01), Bosch
patent: 3510231 (1970-05-01), Bobst
patent: 3694108 (1972-09-01), Pensa
patent: 4077744 (1978-03-01), Pensa
patent: 4273517 (1981-06-01), Heyl
patent: 4320100 (1983-01-01), Forster

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