Method for monitoring an anti-leak valve of a circuit for supplying oil between an oil reservoir and elements to be lubricated of a jet engine, comprising steps of: measuring oil level values in the reservoir, at the beginning and at the end of starting the jet engine; calculating the difference between the measured oil levels, to form a measured change in the oil level; measuring an oil temperature value; determining an estimated change of the oil level in the reservoir, depending on the oil temperature; calculating the difference between the measured change and the estimated change in the oil level for the measured temperature; comparing the calculated difference with a detection threshold; and activating an alarm depending on the result of the comparison.

A lubrication detection method includes a first step is a lubricator provides an information to a processor, a second step is to detect temperature information within a predetermined time period and then to create a temperature curve and then to determine whether or not the recess in the temperature curve faces upward, and a third step of detecting a start point temperature value to form Value A, and averaging temperature values within time period in front of the lowest point to form Value B, and average temperature values after time period in back of the lowest point to form Value C, and determining whether or not Value B is smaller than Value A, and then determining whether or not Value B is smaller than Value C, and then generating an information of Normal indicative of normal lubrication.

A lubrication detection method includes a first step is a lubricator provides an information to a processor, a second step is to detect temperature information within a predetermined time period and then to create a temperature curve and then to determine whether or not the recess in the temperature curve faces upward, and a third step of detecting a start point temperature value to form Value A, and averaging temperature values within time period in front of the lowest point to form Value B, and average temperature values after time period in back of the lowest point to form Value C, and determining whether or not Value B is smaller than Value A, and then determining whether or not Value B is smaller than Value C, and then generating an information of Normal indicative of normal lubrication.

The present invention provides an abnormality detector for a rolling bearing including an outer race, and an inner race. The abnormality detector includes a filter configured to prevent metal pieces contained in lubricating oil flowing through the bearing space between the outer and inner races from passing through the filter, while allowing the lubricating oil to pass through the filter so as to flow to the outside space of the bearing space; an electric circuit including a pair of permanent magnets mounted, as a pair of electrodes, to the filter so as to be spaced apart from each other, and lines extending from the respective electrodes to a power source; and an output detector configured to detect a change in electrical output from the electric circuit when metal pieces adhere between the pair of permanent magnets, thereby detecting the state of metal pieces contained in the lubricating oil.

The present invention provides an abnormality detector for a rolling bearing including an outer race, and an inner race. The abnormality detector includes a filter configured to prevent metal pieces contained in lubricating oil flowing through the bearing space between the outer and inner races from passing through the filter, while allowing the lubricating oil to pass through the filter so as to flow to the outside space of the bearing space; an electric circuit including a pair of permanent magnets mounted, as a pair of electrodes, to the filter so as to be spaced apart from each other, and lines extending from the respective electrodes to a power source; and an output detector configured to detect a change in electrical output from the electric circuit when metal pieces adhere between the pair of permanent magnets, thereby detecting the state of metal pieces contained in the lubricating oil.

The oil air supply system includes a lubricant oil supply pipeline, a compressed air supply pipeline, a mixing device which distributes lubricant oil supplied from the lubricant oil supply pipeline in a fixed amount and mixes the lubricant oil with compressed air to generate oil air, a plurality of oil air supply pipelines which supply the oil air to a plurality of bearings of a main spindle device respectively, a flow rate sensor provided in the lubricant oil supply pipeline and detects the flow rate of the lubricant oil, a pressure sensor provided in the compressed air supply pipeline and detects the pressure of the compressed air, and an abnormality detection device which detects supply abnormality of lubricant oil based on a detection signal output from the flow rate sensor and detects supply abnormality of compressed air based on a detection signal output from the pressure sensor.

The oil air supply system includes a lubricant oil supply pipeline, a compressed air supply pipeline, a mixing device which distributes lubricant oil supplied from the lubricant oil supply pipeline in a fixed amount and mixes the lubricant oil with compressed air to generate oil air, a plurality of oil air supply pipelines which supply the oil air to a plurality of bearings of a main spindle device respectively, a flow rate sensor provided in the lubricant oil supply pipeline and detects the flow rate of the lubricant oil, a pressure sensor provided in the compressed air supply pipeline and detects the pressure of the compressed air, and an abnormality detection device which detects supply abnormality of lubricant oil based on a detection signal output from the flow rate sensor and detects supply abnormality of compressed air based on a detection signal output from the pressure sensor.

Detecting the occurrence of loss of effective lubrication in high-speed machinery components is provided. The imminent catastrophic failure may be predicted when torque or power transfer is lost. An estimate of when failure will likely occur throughout the operation of the machinery may be determined as well as the damage state after the liquid lubrication supply has ended or becomes inadequate to lubricate the machinery components effectively. By monitoring the concentration of gas species and the rate of change in concentration of the gas in the gearbox or machinery enclosure after the supply of the primary lubricant ends, determinations may be made about the time to failure and the damage state. The determinations may be based on thermomechanical and chemical processes, on measurement of a baseline system, or by setting a threshold of expected change in gas concentration. These determinations may be transmitted for further decision making and response.

Detecting the occurrence of loss of effective lubrication in high-speed machinery components is provided. The imminent catastrophic failure may be predicted when torque or power transfer is lost. An estimate of when failure will likely occur throughout the operation of the machinery may be determined as well as the damage state after the liquid lubrication supply has ended or becomes inadequate to lubricate the machinery components effectively. By monitoring the concentration of gas species and the rate of change in concentration of the gas in the gearbox or machinery enclosure after the supply of the primary lubricant ends, determinations may be made about the time to failure and the damage state. The determinations may be based on thermomechanical and chemical processes, on measurement of a baseline system, or by setting a threshold of expected change in gas concentration. These determinations may be transmitted for further decision making and response.

There is described herein methods and systems for detecting of metallic chips in a fluid system of an aircraft engine. A resistance value is measured across a magnetic chip detector mounted to a fluid system of the aircraft engine. The resistance value is transmitted to an engine computer of the aircraft engine. In the engine computer, The resistance value is compared to a first threshold and a first warning indicative of a chip in the fluid is issued when the resistance value exceeds the first threshold.