LUBRICATING OIL DEGRADATION SENSOR AND MACHINE PROVIDED THEREWITH

摘要

There is provided a lubricant deterioration sensor which is installed in a machine body so as to detect deterioration of lubricant in the machine body. The lubricant deterioration sensor includes a main body that is configured to be fixed to the machine body and a replaceable unit that can be replaced from the main body. The replaceable unit includes a light emitting element and a color light receiving element. An oil gap formed in a gap forming member provided in the main body is arranged on an optical path formed from the light emitting element to the color light receiving element. The main body has a first fitting portion, and the replaceable unit has a second fitting portion. The first fitting portion and the second fitting portion are fitted to each other in a state where a positional relationship of the gap forming member with the light emitting element and the color light receiving element becomes a predetermined positional relationship.