Conveyor chain

摘要

A conveyor chain constructed so as to prevent a leakage of lubricant oil to the outside. The conveyor chain comprises a plurality of bearing elements operable to revolve in a raceway between an outer circumferential surface of a bush and an inner circumferential surface of a roller. A pair of right and left thrust bearing annular members are press-fitted onto the outer circumferential surface of the bush and are positioned between the inner side surface of an inner link plate and the outwardly-facing end surfaces of the bearing elements. Annular sealing members for sealing lubricant oil within bearing element raceway are disposed between the inner circumferential surface of the roller and an inner circumferential surface of the thrust bearing annular member. The sealing members slidably contact but are not deformed by the inner circumferential surface of the roller.

主权项

1. A conveyor chain having a series of links interconnected to form an elongated chain, each link comprising
a pair of right and left inner link plates, said link plates having inner surfaces spaced apart on opposite sides of the chain, and having bush holes; a bush press-fitted into said bush holes, said bush having inner and outer circumferential surfaces; a roller rotatably fitted around the bush, said roller having inner and outer circumferential surfaces; a bearing raceway extending radially between said outer circumferential surface of the bush and said inner circumferential surface of said roller, and extending axially between said inner surfaces of said inner link plates; a link pin inserted through said inner circumferential surface of said bush and having ends on each side of said chain; a pair of right and left outer link plates, each link plate being press-fitted to one of said ends of said link pin, said outer link plates linking said inner link plates to the inner link plates of an adjoining link in said series in the longitudinal direction of said chain; a plurality of bearing elements loosely inserted in said bearing raceway, and a pair of right and left thrust bearing annular members press-fitted to the outer circumferential surface of the bush, each annular member disposed between said inner side surface of the adjacent inner link plate and the adjacent end surfaces of the bearing elements; and an annular sealing member for sealing lubricant oil within said bearing raceway disposed between said inner circumferential surface of the roller and an outer circumferential surface of each thrust bearing annular member in a condition of slidably contacting with and of not being deformed by either the inner circumferential surface of the roller, or the outer circumferential surface of the thrust bearing wherein the annular sealing member comprises an outer circumferential surface that is displaceable in a radial direction; wherein the outer circumferential surface of each thrust bearing annular member has a first diameter and an annular groove with a bottom having a second diameter, wherein the annular groove in each thrust bearing annular member receives the inner circumferential portion of one of the annular sealing members; and wherein each annular sealing member comprises an inner circumferential portion having a diameter larger than the second diameter and smaller than the first diameter.