Method and device for evaluation and indication of wear condition of motor lubrication

A device for evaluating and indicating the wear conditions of lubrication oil in a motor, with an electric storage source, through the integration of an electric current representing the sensed values of a temperature variable, comprising:

• a temperature sensor for the oil of said motor;
• a threshold detector;
• an analog circuit;
• an electronic unit comprising said threshold detector and said analog circuit which latter circuit receives a signal from said temperature sensor and supplies a first current proportional to a temperature variation either below or above a satisfactory temperature for the oil;
• an integrating counter supplied which a second current from the electric storage source in idle periods from a third current from the electric storage source through a motor starting contact in periods of utilization for integrating the sum of the first, the second and the third currents;
• and
• a signaling means associated with said threshold detector and measuring any voltage increase across said integrating counter.