Trolley assembly

A trolley wheel assembly for use with an overhead conveyor system. The trolley wheel assembly includes a roller comprising a solid generally cylindrical body with a blind bore opening in the outboard face of the roller; a shaft positioned at one end in the blind bore and having a free end projecting out of the bore for connection to a trolley hanger; a bearing positioned in the blind bore and including an inner race press fit on the shaft and an outer race press fit in the blind bore; and a metallic ring seal sealingly engaging at its outer periphery with the outboard annular face of the outer race and at its inner periphery with the outboard annular face of the inner race to preclude the entry of contaminants into the bearing or the escape of lubricants from the bearing. The ring seal has an axially extending outer periphery which is clamped between the outboard annular face of the outer race and a snap ring positioned in a groove in the blind bore, and an axially extending inner portion having a free annular edge which is preloaded against the outboard annular face of the inner race and which gradually wears an annular groove in the inner race so that the seal therebetween improves with usage. A fluoro chlorated lubricant is provided in the bearing so as to avoid carbonizing of the lubricant when the wheel assembly operates in a hostile environment such as a paint spray booth.