Device for assembling a servo valve

Details Device for assembling a servo valve Device for assembling a servo valve

1995-06-29

1998-09-01

Schwartz, Larry I.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

29890124, 29271, B23P 1904

Patent

active

057993807

ABSTRACT:
The invention proposes a rapid, safe, and economic device for assembling a servo valve with an input shaft, an output shaft and a valve sleeve in a hydraulically centered position by:
a) Forming a preassembled unit consisting of the output shaft and the input shaft;
b) Clamping the valve sleeve into a rotatable position, however a position in which it is fixed in the axial direction;
c) Inserting the preassembled unit into the valve sleeve, with said preassembled unit being axially movable, but positioned in a nonrotatable fashion such that the valve sleeve and the output shaft adjoin one another and can be turned relative to one another;
d) Charging the preassembled servo valve with hydraulic pressure;
e) Centering the servo valve by turning the valve sleeve; and
f) Pressing the preassembled unit into the valve sleeve such that the output shaft and the valve sleeve are pressed together within the overlapping region.

REFERENCES:
patent: 3495623 (1970-02-01), Jespersen
patent: 4641812 (1987-02-01), Vanderlaan et al.
patent: 4953276 (1990-09-01), Kusmer et al.
patent: 5289634 (1994-03-01), Makino et al.
patent: 5531013 (1996-07-01), Nakamura
patent: 5577322 (1996-11-01), Ohshita et al.

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