Fluid handling – Systems – Supply and exhaust
Patent
1985-03-15
1986-05-27
Michalsky, Gerald A.
Fluid handling
Systems
Supply and exhaust
91372, 91375A, 91434, F15B 908
Patent
active
045909652
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In dual piston valve constructions for booster steering control of this kind described herein it has heretofore been known to utilize reaction chambers at corresponding ends of reciprocal piston valves wherein the reaction chambers have closure caps secured by heavy bars bolted to the steering housing which contains the valve pistons. Such constructions are shown in German Pat. No. 12 38 789 and British Pat. No. 1,154,851.
In the prior art patents, the closure gaps are maintained in engagement with the valve body by means of a heavy holding bridge attached by a screw which is secured with a locking plate. This arrangement is expensive and in the case of an insufficient security of the holding screw there is a danger of loosening of the screw and thus of jeopardizing the steering function of the device.
This application is cross-referenced to the application of the same inventors, Armin Lang and Helmut Knodler, Ser. No. 713,407, filed Mar. 15, 1985, and assiged to the same Assignee.
BRIEF DESCRIPTION OF THE PRESENT INVENTION
In the present invention a simplification is effected in a safe manner by means of a clamp engaging the closure caps secured by a pin fixed in a bore of the valve body. The pin is disposed transversely of the axes of the valve pistons, intermediate the valve pistons and locks a resilient bar or clamp against the closure caps. Such pin is provided with a neckdown or recessed portion into which the clamp fits so as to lock the clamp against shifting transversely of itself. Accordingly, a loosening of the pin as well as the resilient clamp is virtually impossible.
Nevertheless, this assembly is simply removable by forcing the resilient clamp away from the pin with a suitable tool whereupon the pin may be pushed out axially from engagement with the resilient clamp and the valve body bore.
A detailed description now follows in conjunction with the appended drawing in which:
FIG. 1 is a longitudinal cross section of the overall steering assembly, valve body and valve pistons, and
FIG. 2 is a section through II--II of FIG. 1.
Referring to the drawing, a valve body 1 is disclosed which will be understood to be at the end of a steering worm (not shown) and rotatably mounted in a steering housing 2. The steering worm will be understood to be conventionally connected resiliently with a steering spindle (not shown) to a torsion rod 3. A fork-shaped end (not shown) of the steering spindle carries a valve actuator pins 4 and 5 which can reciprocate valve pistons 6 and 7 of respective control valves 8 and 9 disposed transversely and eccentrically in relation to the longitudinal axis of the torsion rod, i.e., the valve piston and torsion rod axes are not coplanar.
Each control valve 8 and 9 has a respective annular inlet groove 10 and 11 connecting with a pressure inlet chamber 12. Also, each control valve 8 and 9 has a return annular groove 13 and 14, respectively, as well as respective annular grooves 15 and 16 for connection with a tank (not shown) and respective pressure chamber 17 and 18 of a servo motor 19.
The valve pistons 6 and 7 have transverse grooves 20 and 21 which accommodate respective actuator pins 4 and 5 with a slidable play. Valve pistons 6 and 7 are maintained in lines of contact engagement 23 and 24 with the actuator pins 4 and 5 by means of a resilient clamp 22 such as a bar of spring material of leaf spring or the like.
Clamp 22 is secured by a pin 25 provided with a neckdown or recessed portion 26 into which a loop formed of the clamp length is carried. Thus, the pin 25 is locked in place with respect to the clamp 26 and is fitted into a bore in valve body 1, at its ends. Construction is quite similar to that shown for clamp 33 in FIG. 2.
Axial bores 27 and 28 are provided for respective valve pistons 6 and 7 which have radial passages extending into communication with respective grooves 15 and 16 communicating with pressure chambers 17 and 18, respectively, of servo motor 19, and also communicating prevailing pressures of those pressure chambers
REFERENCES:
patent: 3423939 (1969-01-01), Lewis et al.
patent: 3917018 (1975-11-01), Strauff
patent: 3922953 (1975-12-01), Strauff
patent: 3954149 (1976-05-01), Strauff
patent: 4022110 (1977-05-01), Strauff
Knodler Helmut
Lang Armin
Michalsky Gerald A.
Zahnradfabrik Friedrichshafen AG.
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