Motors: expansible chamber type – Working member position feedback to motive fluid control – Bias-type input and feedback signal means
Patent
1979-08-01
1982-05-18
Michalsky, Gerald A.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Bias-type input and feedback signal means
91445, 91461, 172 7, F15B 13042
Patent
active
043299113
ABSTRACT:
A regulating device for a working cylinder of an agricultural vehicle comprises a directional multiway control valve which controls the flow of a working fluid to the cylinder via a switch valve which is normally biased into its closing position and held in its open position by a pressure difference applied thereto from a throttle arranged in a main control conduit connected to a control fluid pump. One end of the spool of the directional multiway control valve is spring biased into a lowering position and its other end is controlled by a setting cylinder which in turn is controlled by an adjustment pressure having an actual pressure component and a desired pressure component. Means for setting the adjustment pressure includes an adjustable pressure reducing valve connected in series in the main control conduit with an adjustable pressure relief valve, the adjustment means of the latter being controlled by an actual power measuring unit on the vehicle. The variation of the actual and nominal pressure values results in a displacement of the sliding member of the multiway control valve from its neutral position into a new hydraulically balanced condition of the regulating device. The switch valve assumes its blocking position when control fluid pump is inactivated and prevents the unintentional lowering of the load when the control valve is in its lowering position.
REFERENCES:
patent: 2750862 (1956-06-01), Garmager
Michalsky Gerald A.
Robert & Bosch GmbH
Striker Michael J.
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