電磁弁

Japanese Patent JP4089588

B2

Disclosed is a solenoid-operated valve which hardly brings a plunger into a lock and is capable of improving its responsively. In the solenoid-operated valve, the plunger (16) slidably guided in an inner bore (11a) formed in a yoke (12) and a core (13) aligned axially is moved by energizing an electromagnetic coil (17), and a spool (26) in a valve section is moved through a rod portion (26a) which protrudes from an end of the plunger (16) to pass through a center hole of the core. An electromagnetic section fluid chamber (B) defined by a forward end surface of the plunger and the inner bore (13a) of the core communicates with an intermediate fluid (D) chamber defined between the core (13) and a valve sleeve (21), through a clearance (C) between the center (13a) hole and rod portion (26a). The spool (26) is provided at one end thereof with a land (27a) portion whose end surface defines a part of the intermediate (D) fluid chamber. The diameter (d1) of the land portion is chosen to be the same as the diameter (d2) of the plunger, so that the sum in volume of the electromagnetic section (B) fluid chamber and the intermediate (B) fluid chamber can be kept invariable regardless of movement of the plunger (16). A supply/drain (18) passage is further provided to permit the oil around the solenoid-operated valve to be charged into the rear (A) end fluid chamber or discharged therefrom upon movement of the plunger (16).

Mikio Suzuki
Masaru Suzuki
Masaya Segi
Koichi Takanishi
Kaneda

JP2003363550A

May 28, 2008

October 23, 2003

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JTEKT Corporation

A61B6/00; F16K39/04; F16K31/06; G06T5/00; G06T5/20; H04N1/409

JP2081982U
JP1242884A
JP7293729A
JP6341570A
JP4272587A
JP57145804U

US5848613
US6498416
US20010013584
US20020101314

Teruichi Hase
Mikio Takagi

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