Slewing-type working machine
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United States of America Patent
Stats
-
Apr 18, 2017
Grant Date -
Jun 19, 2014
app pub date -
May 11, 2012
filing date -
May 25, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A slewing-type working machine includes: a slewing motor which is a hydraulic motor for slewing; a variable-displacement hydraulic pump; a slewing operation device including an operation member; a control valve controlling the slewing motor based on an operation signal thereof; a pump regulator; a relief valve letting excess fluid to a tank; operation detectors detecting an operation direction and amount of the operation member; a motor rotational speed detector; and a controller controlling a discharge flow rate of the hydraulic pump. The controller obtains a deviation between a target rotational speed of the slewing motor obtained from a slewing operation amount and an actual rotational speed detected by the motor rotational speed detector, and controls the discharge flow rate to make the deviation closer to 0.
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