Construction machine

Details Construction machine Construction machine

1997-06-30

1999-09-14

Lopez, F. Daniel

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60469, F16D 3102

Patent

active

059504307

ABSTRACT:
In a construction machine of a small rotational inertia such as an intrawidth swing machine or a small-sized excavator, a rotative operability varies depending on the posture of a working attachment, and in a reduced state of reach, a change in rotating force is oversensitive to the operation of a working lever, so operation is difficult. To cope with this point, means for detecting the operation of a rotating direction control valve is provided, and an outlet of a center bypassing oil path in the rotating direction control valve and an oil tank are brought into communication with each other through a cut-off valve used for controlling the bleed-off thereof. Further, a pilot port of the cut-off valve and a source of a pilot oil pressure are brought into communication with each other through an electromagnetic proportional pressure reducing valve, and an operation command signal is issued from a controller to the electromagnetic proportional pressure control valve to control the acceleration of rotation and the maximum rotating speed.

REFERENCES:
Patent Abstracts of Japan, vol. 16, No. 262 (M-1265), Jun. 15, 1992, JP 04-064597, Feb. 28, 1992.
Patent Abstracts of Japan, vol. 95, No. 4, May 31, 1995, JP 07-026587, Jan. 27, 1995.
Patent Abstracts of Japan, vol. 11, No. 218 (M-607), Jul. 15, 1987, JP 62-033946, Feb. 13, 1987.
Patent Abstracts of Japan, vol. 16, No. 422 (M-1305), Sep. 4, 1992, JP 04-143324, May 18, 1992.

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