Power plants – Pressure fluid source and motor – Externally operated multiway valve or interconnected control...
Patent
1996-02-01
1998-09-22
Rivell, John
Power plants
Pressure fluid source and motor
Externally operated multiway valve or interconnected control...
60433, 13762521, 251249, 2512505, 251313, F16D 3102, F16K 3153
Patent
active
058097805
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a hydraulic control valve, comprising a two position valve body adapted to be shifted -- by means of a rotary movement of an actuating shaft -- from one operative position to the other.
Such control valves are commonly known. In most cases a control valve is involved, which is placed within a hydraulic circuit and comprises a housing with a pressure connection, a return connection and two service connections for a hydraulic piston cylinder device, a valve body of the rotary spool type being mounted within said housing for a manual angular movement through a limited angle. In such cases the actuating shaft coincides with the shaft of the valve body. Dependent on the actual operative position of the valve body pressurized fluid is supplied to one end of the connected hydraulic piston cylinder device, while the other end of the device is connected to the hydraulic fluid reservoir.
It is an object of the invention to provide a hydraulic valve body of the type referred to hereinabove, the valve body of which is adapted to be shifted by a shaft that may be driven in two opposite directions.
According to the invention this object is achieved in that the shaft of the valve body carries a drive wheel segment extending through an arc that corresponds to the shift angle of the valve body, said wheel segment being in drive connection with the actuating shaft, spring means being provided to bias -- at least in the final stage of a rotary shift movement in either direction -- said wheel segment opposite to the shift direction. At the end of a rotary shift movement, by which the valve body has moved from one position onto the other, a force is thus acting on said wheel segment in a direction opposite to the preceding rotary shift movement tending to keep said wheel in (slipping) engagement with said actuating shaft that may continue to rotate in the same direction. This secures that the wheel segment will be taken along by the actuating shaft when it is desired to reverse the shift direction so as to place the valve into the other operative position.
Preferably the wheel segment is mounted on the shaft of the valve body in such a way, that it may perform a slight lost motion round said shaft. This lost motion, which need to be a fraction of the angular shift movement only, has the advantage that the spring energy collected at the end of the preceding shift movement is completely utilized for initiating a shift movement in the opposite direction so as to cause the wheel segment to operatively engage the actuating shaft, when the direction of rotation of the latter has been reversed. Thus the first part of a shift movement is performed as a lost motion. Upon completion of said lost motion the valve body will be taken along with the wheel segment.
Such lost motion connection between the wheel segment and the shaft of the valve body is of particular advantage when the wheel segment is formed by a gear that cooperates with a gear or pinion on said actuating shaft.
The hydraulic control valve of the present invention may be advantageously applied in all of those cases, where a reversably rotating drive shaft is available.
As an example reference may be made to the hydraulic rotary piston pump disclosed in Dutch patent applications 9301011 and 9301010 (corresponding with EP-A-94201694.0 and EP-A-94201695.7). With such a pump, which is driven by an electric motor, pressure and suction connections are involved, which are independent of the direction of rotation of the pump.
The invention will be hereinafter further explained by reference to the drawing showing a preferred embodiment.
In the drawings:
FIG. 1 shows a longitudinal sectional view through the housing of a rotary piston pump, in which the hydraulic control valve of the present invention is applied;
FIG. 2A and 2B show cross-sectional views according to the line II--II of FIG. 1, in which the valve body is shown in both of its operative positions, while showing also a piston cylinder device in a diagrammatic manner;
FIG. 3 is a cross-sec
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patent: 2925095 (1960-02-01), Bates
patent: 3587234 (1971-06-01), McQueen
patent: 4120202 (1978-10-01), Range et al.
de Jong Leendert Willem C.
Masseling Willem Herman
van Heiningen Arjan Peter
Applied Power Inc.
Rivell John
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