METHOD OF AND DEVICE FOR EXTRACTING INSERTS FROM OVERSPRING BEAM STEP BEARINGS Russian patent published in 2006 - IPC B23P11/02 B61F5/16 

FIELD: railway transport; repair of rolling stock.

SUBSTANCE: invention relates to repair of load-bearing parts of vehicles, particularly, to repair of overspring beams of car bogies with inserts press-fitted into step bearings. According to proposed method, step bearing of overspring beam is heated, together with insert, to temperature exceeding 250°C. Inner surfaces of insert are cooled by blowing at velocity 1.1 times higher than velocity of heat exchange through surfaces in contact with step bearing to eliminate negative allowance between insert and outer bead of step bearing. To extract insert, it is expanded from inside by applying force. Device for implementing the method has body in form of disk to be arranged in step bearing with slots on side surface in which bellcranks 9 are fitted being driven by pneumatic cylinder, with claws for gripping the insert, central hole through which rod 16 of pneumatic cylinder passes to extract insert 40, with inner space designed for distribution of cooling compressed air among nozzles pointed to surfaces of insert.

EFFECT: increased efficiency when repair overspring beams, reduced energy consumption and labor input in process of repair.

3 cl, 4 dwg