Variable priority device for swing motor in heavy construction e

Details Variable priority device for swing motor in heavy construction e Variable priority device for swing motor in heavy construction e

1994-10-14

1996-02-27

Look, Edward K.

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

Condition responsive means for modifying working member...

91461, 60426, 60494, 60468, F15B 1100, F16D 3102

Patent

active

054939500

ABSTRACT:
A variable priority device for a swing motor in heavy construction equipment including a variable orifice device installed in an arm cylinder-side parallel oil passage of an parallel oil passage for supplying oil pumped by a single pump to a swing motor and an arm cylinder, the variable orifice device serving to perform a switching operation between an orifice state and an orifice release state in response to a pilot pressure for moving the spool of a swing motor control switching valve. The variable orifice device includes a check valve disposed in the arm cylinder-side parallel oil passage and provided with a spring chamber and a spool resiliently supported in the spring chamber by a spring exerting a predetermined pressure such that the spool maintains an initial state for closing the arm cylinder-side parallel oil passage, the spool having an internal oil passage for performing an orifice function, and a cutoff valve connected to the spring chamber via an oil discharge passage and adapted to perform a switching operation for selectively opening and closing the oil discharge passage in response to the pilot pressure.

REFERENCES:
patent: 4230022 (1980-10-01), Bianchetta et al.
patent: 4343151 (1982-08-01), Lorimor
patent: 4479349 (1984-10-01), Westveer
patent: 5201176 (1993-04-01), Oshima

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