Spool valve

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 12044331
APP PUB NO 20230140241A1
SERIAL NO

17911099

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A spool is slidably located in a slide hole of a first housing. A second housing forms a servo chamber that is coaxial with the slide hole. A sleeve is slidably located in the servo chamber. A nut is fixed to a piston that is slidably fitted in the sleeve. An electric motor rotates a screw shaft screwed with the nut. The second housing includes an input port and a drain port. A first pressure chamber communicates with the input port. In a balanced state where forces applied to the sleeve from both sides are balanced, a second pressure chamber is blocked from the input port and the drain port by the piston. From the balanced state, when the piston shifts, the second pressure chamber comes into communication with the input port or the drain port.

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Patent Owner(s)

Patent OwnerAddress
KAWASAKI JUKOGYO KABUSHIKI KAISHA1-1 HIGASHIKAWASAKI-CHO 3-CHOME CHUO-KU KOBE-SHI HYOGO 650-8670

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Aoki, Seiji Kobe, JP 18 48
Tanaka, Hideki Kobe, JP 448 5293

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