Fluid handling – Systems – Multi-way valve unit
Reexamination Certificate
2005-09-15
2008-08-19
Hepperle, Stephen M. (Department: 3753)
Fluid handling
Systems
Multi-way valve unit
C137S625690, C251S050000
Reexamination Certificate
active
07412989
ABSTRACT:
In a solenoid valve10, an annular oil groove66is formed at a portion corresponding to a spring chamber56on the external surface of a sleeve19, a drain passage68is formed to make an upper part of the annular oil groove66communicate with the outside of an insertion bore61, and a throttle hole67is provided at a lower part of the annular oil groove66for making the annular oil groove66communicate with the spring chamber56. Since the annular oil groove66communicates with the outside of the insertion bore61at its upper part through the drain passage68, it can be realized to store the operating oil to the height of the upper part of the annular oil groove66, so that the operating oil can be reserved in the spring chamber56which communicates with the annular oil groove through the throttle hole67. Further, the operating oil is supplied from a feedback port48next to the spring chamber56through a clearance between the spool valve19and a valve hole18. Thus, the solenoid valve10is able to secure the damping effect of the working oil on the spool valve19and a plunger17and to suppress the self oscillation even while being operated in the atmosphere for a long time.
REFERENCES:
patent: 5868167 (1999-02-01), Miki et al.
patent: 6948514 (2005-09-01), Kramer et al.
patent: 2005/0133098 (2005-06-01), Ino et al.
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patent: 2002-310322 (2002-10-01), None
Fujita Kaori
Segi Masaya
Suzuki Masaru
Suzuki Mikio
Takanishi Koichi
Hepperle Stephen M.
JTEKT Corporation
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Schneider Craig M
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