Ultrasonic Observation on Oil Insufficiency and Desiccation Process of Oil in Ball Bearing

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For the evaluation of oil supply condition in ball bearing, the variation of transmittance iHsubT2/sub/i affected by the condition of film formation between an outer ring and a ball was observed. When sufficient oil is supplied to the inlet of contact surface and the oil film is ruptured in outlet side, local transmittance measured by point focus probe having 0.2mm focus diameter is increased locally near the contact point of inlet and decreased suddenly at outlet point. Since the iHsubT2/sub/i observed by normal probe having irradiation width of 3.5mm is the value averaged in 3.5mm width which covers inlet and outlet side, however, observed iHsubT2/sub/i has a hump through the wide range in inlet region of ball and decreases gradually near the contact point, and minimum value in iHsubT2/sub/i appears at outlet region far from contact point. For the desiccation of oil, the hump does not appear at all and the position of minimum transmittance agrees with the contact point. Moreover, it is cleared that the area of closed curve formed by the relationship between iHsubT1/sub/i (transmittance from the interface of housing and outer ring) and iHsubT2/sub/i decreases considerably with oil insufficiency. And its area is kept almost constant with desiccation of oil. Furthermore, the transmission degree estimated by transmittance iHsubT2/sub/i, which propagates through the boundary of outer ring and ball, becomes an effective index. This value is increased through oil insufficiency process and kept almost constant for the desiccation of oil.

Ultrasonic Observation on Oil Insufficiency and Desiccation Process of Oil in Ball Bearing

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