Lubrication monitoring apparatus for machine

Claim 1

A lubrication monitoring apparatus for a machine comprising a pump for pumping lubricating oil with a constant flow rate from a lubricating oil reservoir of the machine, a filter for removing contaminants from lubricating oil outputted from said pump, an oil supply device for supplying lubricated mechanical section with lubricating oil cleaned by said filter, and an oil discharge device for discharging lubricating oil passed through said lubricated mechanical section to said lubricating oil reservoir, and further comprising an oil pressure gauge for detecting pressure of lubricating oil inputted from said pump to said filter, a first oil thermometer for detecting temperature of lubricating oil at an adequate position between said lubricating oil reservoir and an inlet of said lubricated mechanical section, a second oil thermometer for detecting temperature of lubricating oil in the vicinity of an outlet of said lubricated mechanical section, a differential oil temperature detecting device to obtain difference in temperature from values detected by said first and second oil thermometers, and a warning device for giving warning when any of detected values of said oil pressure gauge, said first oil thermometer, and said differential oil temperature detecting device is out of a predetermined value.