SKF

Disclosed is a multi-row rolling bearing comprises an inner ring and an outer ring, wherein the inner ring and the outer ring form at least a first raceway and a second raceway, and a first set of rolling elements arranged at the first raceway of the inner and the outer ring, and a second set of rolling elements arranged at the second raceway of the inner ring and outer ring. The first set of rolling elements comprises a first number of rolling elements and the second set of rolling elements comprises a second number of rolling elements, wherein the first number of rolling elements is different from the second number of rolling elements.

A induction hardening treatment method for a large bearing ring, comprising 1) austenitizing step: heating the bearing ring by means of inductors (i<r1>, i<r2>, I<b>) so that surface temperature of the bearing ring reaches austenitizing temperature; and 2) martensitizing step: spraying a coolant on the bearing ring by means of showers (s<r>, s<b>) to cool the bearing ring rapidly, and to transform austenite in the structure of the bearing ring into martensite. Said austenitizing step is realized by simultaneously heating a raceway side surface (f<r>) and a raceway back side surface (f<b>) of the bearing ring by means of the inductors (i). Based on the above method, the present invention also provides an induction heating and quenching machine tool for a large bearing ring. The double-side heating not only allows the bearing ring to be hardened on both faces, but also can adjust a formation depth of a hardened layer below both side surfaces of the bearing ring. Said depth may reach as deep as a core portion of the bearing ring, thereby allowing the hardened layer to be formed throughout the entire thickness of the bearing ring, satisfying material performances required by different applications to the greatest extent.

A hub-bearing assembly serves to rotatably mount a soil-working disc (D) on a supporting axle (A) of an agricultural machine. The assembly includes a hub-bearing unit (10) having a rotatable outer race (11) with a flange (12) on an outer axial end (11a) for mounting a disc (D), an enlarged collar section (13) extending from an inner axial end (11b) of the race (11), and a recess (38) defined axially between the flange (12) and collar section (13). A sealing device (20) is mounted with the collar section (13)on an inner side of the hub-bearing unit opposite to the side of the flange (12). The recess (38) serves as a seat for winding agricultural fibers or wires picked up from the fields during use of the agricultural machine and is partially defined by a barrier surface (34) which prevents fibers from sliding out of the recess (38).

A hub-bearing assembly serves to rotatably mount a soil-working disc (D) on a supporting axle (A) of an agricultural machine. The assembly includes a hub-bearing unit (10) having a radially outer, rotatable outer race (11) from one side of which a flange (12) radially extends for mounting a disc (D). A sealing device (20) is mounted on an inner side of the hub-bearing unit opposite to the side of the flange (12). The radially outer surface of the assembly has a portion (38) between the flange (12) and an inner side of the outer race (11), which is radially recessed so as to serve as a seat for winding agricultural fibers or wires picked up from the fields during use of the agricultural machine. At least one cutting projection (40) extends radially outwardly from the recess (38) to at least facilitate removal of fibers or wires.

It is proposed that the first end face has at least one elevation (12) which differs from an individual step which has a right angle in one section.

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …