Electrohydraulic booster

Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type

Reexamination Certificate

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C091S049000, C091S41700A

Reexamination Certificate

active

08074557

ABSTRACT:
An electrohydraulic booster comprises an electromechanical transducer and a hydromechanical power stage which is connected to a pressurized medium supply and encompasses a cylinder and a piston that can be moved therein along the working axis. The electromechanical transducer acts on a spool valve which is associated with the hydromechanical power stage, is disposed at least in part inside the piston, is guided within a guiding bore in such a way as to be movable along the working axis, and has two first leading edges that cooperate with corresponding second leading edges located on the guiding bore in order to form a hydraulic sequential control. The guiding bore consists of two parts, i.e. a cylinder-mounted first section and a second section which can be moved along the working axis and comprises the second leading edges.

REFERENCES:
patent: 1822667 (1931-09-01), Proell
patent: 3390612 (1968-07-01), Wills
patent: 3678803 (1972-07-01), Schwenzfeier
patent: 4779837 (1988-10-01), Mito et al.
patent: 4907492 (1990-03-01), Hampejs
patent: 4934250 (1990-06-01), Siegel
patent: 19757157 (1999-07-01), None
patent: 0296104 (1988-12-01), None
International Search Report for corresponding International Application No. PCT/EP08/009467 mailed Sep. 4, 2009.

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