Motors: expansible chamber type – Working member position feedback to motive fluid control – Bias-type input and feedback signal means
Patent
1981-09-21
1984-10-09
Maslowsky, Paul E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Bias-type input and feedback signal means
91459, F15B 1316
Patent
active
044754418
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The present invention relates, in general, to setting means for electrohydraulic devices, and in particular to a new and useful setting device which utilizes a control slide slidably mounted to the side of a piston to be controlled by the control slide.
SUMMARY OF THE INVENTION
A very favourable support of the electro-magnet armature, that essentially eliminates all friction in connection with the movements thereof and of the slide is obtained, according to a particular aspect of the invention in a set device for operating a hydraulic control slide by means of the armature of an electromagnet, characterized in that the armature is suspended in spring means permitting movement of the armature in the length direction of the slide, and that the slide is unrigidly connected to the armature by means of at least one driving surface movable with the armature.
BRIEF DESCRIPTION OF THE DRAWING
The invention will now be described more closely below with reference to embodiments shown on the attached drawings, wherein:
FIG. 1 shows an embodiment of the set device in axial section,
FIG. 2 shows a section in the direction of the arrows II--II in FIG. 1,
FIG. 3 is a plan view showing a spring disc included in FIG. 2,
FIG. 4 shows a side view of the set device as connected for operating the valve slide of a hydraulic valve,
FIG. 5 illustrates a further embodiment of the set device in axial section, and
FIG. 6 is a side view and partly in section illustrating how two set devices according to FIG. 5 are used for operating the valve slide of a hydraulic valve.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
For an understanding of the principles of the invention, reference is made to the following description of typical embodiments thereof as illustrated in the accompanying drawings.
The housing of the inventive set device is composed of three portions 2, 4 and 6. The housing portions 2,4 and 6 are sealingly connected to each other essentially end to end via O-ring seal 8 and 10. More particularly the connections consist of axial bolt joints through outer extensions of the walls of the three housing portions. At 11 of these bolt joints is indicated.
The housing portion 2 along a part of its length has a central bore 12 and along the remainder of its length a cylindrical chamber 14 widening from the bore 12. The chamber 14 is opened towards the interior of the housing portion 4, said interior being composed of an outer, cylinder shaped space 16, which is closed by a wall 18 at the other end of the housing portion 4, and a central through bore 20. The space 16 and bore 20 are separated by a cylinder shaped part 21 of the housing portion 4. The space 16 encloses an embedded electromagnet coil 22. In the central bore 20 a sleeve 24 is glidably guided. The boring 20 at its end remote from the housing portion 2 has a stop abutment 25 for the sleeve 24.
The bore 12 of the housing portion 2 forms a cylinder bore for a piston 26 with a piston rod 28, which is glidably guided in the sleeve 24. At its end remote from the piston 26 the piston rod 28 has a peripheral groove for a lock ring 30.
The inwardly directed movement (to the right in FIG. 1) of the piston 26 is restricted by a disc 32 that is kept pressed against the end of the housing portion 4 by means of a compression spring 34 acting between the disc 32 and the end wall 36 of the housing portion 6. Through a central hole in the disc 32 an end pin 38 of the piston rod 28 extends into the housing portion 6. The wall 36 has a central hub with a through hole 40, through which a bolt 42 extends glidably and sealingly by means of an O-ring seal 44.
The chamber 14 contains a control slide and armature unit 46. Said unit includes a cylindric body 48, the outer peripheral surface of which abuts against the inner cylindric wall of the chamber 14 and that has a great axial through hole 50 for the piston rod 28. The body 48 at each end has an axially protruding annular edge 52 and 54, respectively, and is clamped between an annular shoulder 56 in
REFERENCES:
patent: 2752891 (1956-07-01), Farkas
patent: 2966891 (1961-01-01), Williams
patent: 3131608 (1964-05-01), Yando
patent: 3208352 (1965-09-01), Lucien
Henriksson Goran
Lindahl Sune
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