Fluid handling – Self-proportioning or correlating systems – Supply and exhaust type
Patent
1998-10-19
2000-02-29
Michalsky, Gerald A.
Fluid handling
Self-proportioning or correlating systems
Supply and exhaust type
91420, F15B 1304
Patent
active
060296895
ABSTRACT:
A communication area of a left pressure reception chamber, a pressure reception chamber, a right pressure reception chamber and another pressure reception chamber for moving a spool to first and second positions with a first pump port and a second pump port is made large at the beginning of a stroke, small at the intermediate of the stroke and medium at the end of the stroke so as to return the spool from the first and second positions to the neutral position in a short time while preventing cavitation from occurring. While the volume of the pressure reception chamber located opposite to the moving direction of the spool is prevented from changing, the spool is moved slowly in the above-described opposite direction. Thus, the spool is prevented from making an over-stroke and also prevented from having a hunching even if a return pressure oil has a large change in pressure.
REFERENCES:
patent: 5113894 (1992-05-01), Yoshida
Arai Mitsuru
Endo Hiroshi
Komatsu Ltd.
Michalsky Gerald A.
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