Fluid handling – Systems – Multi-way valve unit
Patent
1995-10-24
1998-02-10
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
13762569, F15B 13044
Patent
active
057158673
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a mechanically-controlled power transmission device, in particular for automotive vehicle applications, such as control of braking pressure in a brake or the rapid correction of a hydropneumatic suspension.
Among the numerous present-day systems of mechanically-controlled power transmission, hydraulic systems such as hydraulic servo valves appear the best suited for incorporation into vehicles or other motorized equipment, since they are inexpensive and can be easily and quickly adapted to new technical or economic requirements.
A hydraulic servo valve can be defined as the junction between an electric or electronic device supplying a control signal, and a hydraulic device designed to provide a response as a function of this electrical signal.
The characteristics required of a servo-valve are as follows: jack, the hydropneumatic suspension of a vehicle. rapid, stable response of the automatic control function, independently of the requisite hydraulic flow rate. operation, by providing: for use and filtration of the hydraulic fluid,
A servo valve possessing all of these features is known, this valve comprising a rotary actuating element, such as a rotary electric motor of low inertia, controlled in position and connected by mechanical linkage means to a mechanical device such as a hydraulic distributor incorporating a linear valve, this motor being equipped with a return spring biasing it in its initial position.
A device of this kind is well suited for use in a vehicle, since the rotary electric motor is insensitive to vibrations and acceleration, which have no effect on its angular position. This is not the case in a linear motor, the metallic weight of which can be shifted because of the effect of inertia. Hydraulic distributors incorporating linear valves are currently in wide-spread use, in the automotive industry, since they are inexpensive, show little sensitivity to impurities, and since, because of the very low weight of the valve, acceleration along its axis creates only very weak forces.
However, this conventionally-known device exhibits a number of problems related to the inevitable presence of clearances in the connection between the actuating element and the valve. The result is a degree of imprecision in the position of the valve and premature wear of the parts. Moreover, in the event of breakage of the mechanical linkages, the hydraulic valve may either remain in its position, which is not necessarily the position corresponding to the greatest driving safety in the event of breakdown of the hydraulic system, or it may shift uncontrollably.
To solve this problem, a return spring which acts on one end of the valve may be provided as illustrated in FIG. 1.
The electrohydraulic servo valve shown in this Figure comprises mainly a rotary electric motor (not shown) having axis A and being capable of rotating at a limited angle around a middle position, as shown by the arrow F. This motor actuates the valve 1 of a hydraulic distributor 2, for example by means of a lever 3 of which one end is connected to the axis A and whose other end supports a ball joint 4 housed in a clevis 5 attached to one end of the valve 1.
This valve comprises a rod 6 equipped with two blocks P1 and P2 which slide in the bore 7 of a sleeve 8, which is itself housed in a body or housing 9, a part 10 in the form of a plug or end block fastened to the housing 9 and ensuring the fluid-tightness of the side opposite the clevis 5.
The blocks P1 and P2 can seal or clear the holes 11 provided in the sleeve 8 and the housing 9 and opening into the bore 7, thus making it possible to establish or seal off communications between a user device U (that is, the hydraulic device being operated) and either a high-pressure source H or an exhaust E. A spring R, for example a helical spring mounted on one end of the valve 1 and interposed between the block P2 and the part 10, ensures the mechanical clearance adjustment of the linkage and pushes the valve 1 into a predetermined position in the event of breakdown of the mot
REFERENCES:
patent: 3067775 (1962-12-01), Brueder
patent: 3095011 (1963-06-01), Banker
patent: 3807441 (1974-04-01), Grosseau
patent: 4784041 (1988-11-01), Lang
Dore Jacques
Edwige Francois
Automobiles Citroen
Automobiles Peugeot
Michalsky Gerald A.
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