Hydraulic Control System in Working Machine

Number of patents in Portfolio can not be more than 2000

United States of America

APP PUB NO 20250052035A1
SERIAL NO

18719959

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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PROBLEM: To avoid the pressure of the actuator oil passage from becoming higher or equal to the upper limit pressure that is set depending on an individual option hydraulic actuator, during non-operation of an option operation lever, even if the actuator oil passage connected to the option hydraulic actuator is not provided with a variable relief valve. SOLUTION: It is configured to release the pressure of the actuator oil passage into the oil tank via the option control valve, the load pressure introducing oil passage, the variable relief valve, by switching the option control valve to load pressure relief positions at which the pressure of the actuator oil passage is allowed to flow into the load pressure introducing oil passage, when the pressure of the actuator oil passages exceeds the upper limit pressure during non-operation of the option operation lever; as well as by controlling the relief setting pressure of the variable relief valve connected to the load pressure introducing oil passage so as to be less than or equal to the upper limit pressure.

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Patent Owner(s)

  • CATERPILLAR SARL

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
KIYASU, Koichi Akashi-shi, JP 14 2
NAKAJIMA, Hideki Akashi-shi, JP 57 575

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