OIL VIBRATION DIAGNOSIS APPARATUS AND OIL VIBRATION DIAGNOSIS METHOD

Title:

OIL VIBRATION DIAGNOSIS APPARATUS AND OIL VIBRATION DIAGNOSIS METHOD

Document Type and Number:

WIPO Patent Application WO/2017/065249

Kind Code:

A1

Abstract:

First, the pressure of the oil in an oil passage in a control valve device is measured. Then, on the basis of the measurement results obtained, amplitude and period of pressure fluctuations are detected and a diagnosis is made whether the control valve device is in an oil vibration state or a non-oil vibration state. When the amplitude is greater than a reference amplitude value and the period is less than a reference period value, the diagnosis of an oil vibration state is made. On the basis of the diagnosis results, the time that the oil vibration state has continued is also determined. When the oil vibration state continues for a reference time or longer, warning information is output. Thus warning information is output in a stepwise fashion according to the circumstances of oil vibration generation and continuance. As a result, a control valve device manufacturer, a manufacturer of transportation equipment in which a control valve device is loaded, a transportation equipment user, or a maintenance worker can perform countermeasures according to the warning information.

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Inventors:

SUGIMOTO YOSHIHISA (JP)
SUMIYOSHI MOTOHIRO (JP)
MIYAO TOSHIMITSU (JP)

Application Number:

PCT/JP2016/080458

Publication Date:

April 20, 2017

Filing Date:

October 14, 2016

Export Citation:

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Assignee:

NIDEC TOSOK CORP (JP)

International Classes:

F15B20/00; F16H61/00; F16H61/12; F16H63/40; G01M99/00

Foreign References:

JPH03260404A	1991-11-20
JPS4930901A	1974-03-19
JPH02168004A	1990-06-28