CAPACITY CONTROL DEVICE FOR VARIABLE CAPACITY TYPE HYDRAULIC PUMP

Japanese Patent JP3685287

B2

PROBLEM TO BE SOLVED: To improve responsiveness by regulating capacity of a variable capacity type hydraulic pump in a short time.
SOLUTION: A variable capacity type hydraulic pump comprises a servo cylinder 5 to incline the capacity control member 4 of a variable capacity type hydraulic pump 1; and an LS valve 8 to control communication of the large chamber 7 of the servo cylinder 5 with a pump delivery passage and a tank. Capacity is controlled such that an actual differential pressure between a pump delivery pressure and a load pressure becomes a setting differential pressure. An LS valve 8 is operated by a pump discharge pressure in a direction in which capacity is reduced, and operated by a dummy load pressure in a direction in which capacity is increase. The dummy load pressure is reduced by an accumulator 37, a throttle 35, and a pressure reduction valve 31 and made equal to a load pressure, reduced to a value lower than the load pressure, or increased to a value higher than the load pressure, and the LS valve 8 is operated in a surplus manner in a direction in which capacity is increased to a value higher than an ordinary value and the capacity decreased to a value lower than the ordinary value, and capacity is regulated in a short time.

Kenji Morino
Yosuke Oda
Nobuyoshi Yoshida
Naoki Ishizaki
Mutsumi Ono
Hori Takayuki

JP9357597A

August 17, 2005

April 11, 1997

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KOMATSU LTD.

F15B11/00; F04B49/08; F15B11/05; (IPC1-7): F15B11/00

JP7197907A
JP579502A
JP3125002A
JP6280809A
JP5172111A
JP4285302A
JP7301204A
JP518365A
JP462379U
JP276904A

WO1991002167A1

Tadashi Hamamoto
Yoshiaki Sato

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