Railway Axle Box End Cap for Accurate Infrared Temperature Detection

An end cap is introduced as an intermediary component between the infrared detector and the bearing. This end cap features a specific geometry with a first inner axial ridge that creates a restricted axial gap (≤5mm) to the outer bearing ring, allowing the infrared beam to detect bearing temperature while blocking direct detection of the hotter seal and screw bolt temperatures. The end cap thus mediates the detection process to provide accurate bearing temperature readings.

The end cap design implements local quality by creating a specific geometric configuration where only certain areas are visible to the infrared detector. The first inner axial ridge and the controlled axial gap create a localized viewing zone that focuses detection on the bearing ring temperature while excluding other components. This selective visibility ensures accurate local temperature measurement of the bearing.

The end cap acts as a thermal and optical intermediary that selectively transmits infrared radiation from the bearing while blocking radiation from the seal and screw bolts. The controlled axial gap of ≤5mm ensures the infrared beam primarily interacts with the bearing ring, making the end cap a mediator that filters out harmful thermal signals from other components that would cause false readings.

The design acknowledges that seals and screw bolts naturally operate at higher temperatures, but converts this potentially harmful factor into a benefit by using the end cap geometry to block their thermal radiation from detection. The high temperature of these components, while normally a source of false alarms, is now used to emphasize the need for selective detection, and the end cap successfully filters these signals to prevent erroneous failure detection.