Cylindrical roller bearing and cage thereof

Abstract

The invention relates to a cylindrical roller bearing and a cage thereof. The roller of the cylindrical roller bearing of the invention is a stepped shaft-shaped roller which is thick at the middle part and thin at both ends; and a pocket is of a frame-shaped structure which is matched with the shape of the stepped shaft-shaped and is thick at the middle part and thin at both ends. When the bearing rotates, the outer peripheral surfaces of the small-diameter sections at both ends of the stepped shaft-shaped roller are in sliding fit with the sectional side walls of the both ends of the pocketso as to drive the stepped shaft-shaped roller to apply driving force capable of driving the cage to rotate onto the cage via the sectional side walls of pocket during rotation of the stepped shaft-shaped roller around an inner ring; and the middle thick part of the stepped shaft-shaped roller separately contacts with the inner and outer rings of the bearing, and a gap is left between the middle thick part and the pocket. According to the invention, when the bearing rotates, the roller drives the cage to rotate via small-diameter sections at two ends, and the middle thick cylindrical part of the roller is only in contact fit with the inner and outer rings of the bearing, so frictional force between the roller and the cage is completely transferred to the small-diameter sections at two endsof the roller, the problem of excess wearing of a fitting surface between the roller and the inner and outer rings is overcome, and the service life of the bearing is prolonged.

Description

technical field [0001] The invention relates to a cylindrical roller bearing and its cage. Background technique [0002] Most of the bearings of aviation turbojet engines use cylindrical roller bearings, and these bearings usually work at high speeds (the current DN value has reached 3×10 6 mm.r / min or more), high temperature and light load environment. [0003] The Chinese patent with the announcement number CN 101910660 B and the announcement date of 2013.03.13 discloses a cylindrical roller bearing. The annular body of the cage of the bearing is evenly distributed in the circumferential direction with a plurality of pockets for installing cylindrical rollers. The rollers are installed in the pockets and are in contact with the inner and outer rings of the bearing. The front and rear side walls of the pockets limit the cylindrical rollers in the circumferential direction. During the rotation process, the cylindrical rollers rotate between the inner and outer rings of the...

AI Technical Summary

Problems solved by technology

The rolling mating surfaces of the rollers of this kind of bearing and the inner and outer rings not only bear the friction force of the inner and outer rings, but also receive the friction force generated by the pocket holes on the cage when the cage is driven to rotate. , when this kind of bearing is used, especially in high-speed working conditions such as aero-engines, it is easy to cause excessive wear on the mating surfaces of the rollers and the inner and outer rings, which affects the service life of the bearing

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