US Patent No. 10,975,953

OIL CIRCULATION DEVICE AND OIL CIRCULATION SYSTEM FOR AGITATING OIL IN OIL BATH


Patent No. 10,975,953
Issue Date April 13, 2021
Title Oil Circulation Device And Oil Circulation System For Agitating Oil In Oil Bath
Inventorship Norimitsu Uemura, Yamanashi (JP)
Masaaki Uematsu, Yamanashi (JP)
Assignee FANUC CORPORATION, Yamanashi (JP)

Claim of US Patent No. 10,975,953

1. An oil circulation device for agitating oil, comprising:an oil bath having a first oil supply/discharge port and a second oil supply/discharge port;
a circulation pump for circulating the oil;
a pair of pipes for connecting the oil bath and the circulation pump;
an oil supply/discharge direction switching valve which is attached to the pipes so as to switch the oil supply/discharge direction for the first oil supply/discharge port and the second oil supply/discharge port;
a filter mechanism which is located upstream of the circulation pump so as to filter impurities in the oil; and
a control unit for controlling at least the circulation pump and the oil supply/discharge direction switching valve, wherein
the control unit has:
an agitation mode in which a command is executed for the oil supply/discharge direction switching valve so that the oil supply/discharge direction is switched so as to supply oil to the first oil supply/discharge port located at a low position in the oil bath and discharge oil from the second oil supply/discharge port located at a high position in the oil bath, whereby oil in the oil bath is agitated via the circulation pump from the low position to the high position in the oil bath; and
a filter mode in which, after the agitation mode is executed so as to suspend impurities in the oil bath, a command is executed for the oil supply/discharge direction switching valve so that the oil supply/discharge direction is switched so as to discharge oil from the first oil supply/discharge port located at the low position in the oil bath and supply oil to the second oil supply/discharge port located at the high position in the oil bath, whereby impurities in the oil sent to the filter mechanism by the circulation pump are filtered.