(Inner ring) TRACK core position measuring device

The (Inner Ring) Track Shim Position Measuring Device is a comparative measurement jig that quickly and repeatedly verifies whether the track center of an inner ring component is accurately positioned relative to the reference plane as specified in the drawing.

Track shim position refers to the position of the track center relative to the reference plane of the component. This value significantly influences the contact position, center of load, and effective contact width with the mating component during assembly. Misaligned shim position can lead to lopsided contact, increasing localized loads, uneven wear, increased noise/vibration, and reduced durability. Therefore, it is a key management item from a functional quality perspective.

The measurement method uses a dedicated contactor tailored to the track geometry to read displacement based on the track position. First, an approved sample master is selected and secured in the jig reference pocket. A dedicated contactor (a ball or probe that rolls or rests along the track surface) is brought into contact with the track measurement section under specified conditions, and a dial gauge or digital indicator is set to zero. Afterwards, the inner ring to be measured is seated and fixed under identical conditions to reproduce the track contact condition. The gauge reading is then read to determine the track shim position deviation compared to the sample master.

The jig structure standardizes track contact conditions and component-based seating conditions, allowing for rapid and repeatable determination of shim position deviation during the process. This allows for early detection of track position changes due to changes in machining conditions or tool wear.