Roller bearing backing ring
View Patent ↗A novel two-piece backing ring assembly for a railcar axle is presented. The backing ring assembly has an annular body affixed to the fillet of the journal and a locking ring for further affixing the annular body into position on the journal. The locking ring has an inboard end affixed to the dust guard of the shaft and an outboard end for engaging a slot in the annular body. The locking ring assembly may be retrofitted to older generation railcar axles to increase the structural rigidity of the bearing assembly and minimize fretting wear caused by railcar axle deflection.
1. A backing ring combination with a shaft having a journal at a free end of the shaft, the journal extending to a fillet merging with a shoulder of a larger diameter cylindrical surface, and with a bearing assembly affixed around the journal and a bearing retaining cap affixed to a free end of the journal to clamp the bearing assembly on the shaft, the backing ring comprising:
an annular body affixed to the fillet, the annular body further having a slot; and
a locking ring having an outboard end for engaging the slot and an inboard end for receiving the cylindrical surface, wherein the locking ring further comprises an inner groove on an inner surface of the locking ring, and wherein the locking ring further comprises an outer groove on an outer surface of the locking ring.
2. The backing ring according to claim 1 , wherein the slot is in the axially inward facing surface of the annular body.
3. The backing ring according to claim 1 , wherein the inboard end of the locking ring establishes an interference fit with the cylindrical surface.
4. The backing ring according to claim 1 , wherein the outboard end of the locking ring establishes an interference fit with the slot.
5. The backing ring according to claim 1 , wherein the outboard end and the inboard end of the locking ring are each annular.
6. The backing ring according to claim 5 , wherein the locking ring further comprises a connecting member to connect the outboard end to the inboard end of the locking ring.