Ball bearing and supporting construction

Abstract

A ball bearing has an inner ring fitted on a rotational shaft and including an inner ring raceway on an outer circumferential surface thereof, an outer ring including an outer ring raceway on an inner circumferential surface thereof, a plurality of balls rotatably provided between the inner ring raceway and the outer ring raceway and a crown resin cage for retaining the balls at equal intervals in a circumferential direction. A bore diameter of the inner ring is 100 mm or more, and a radial clearance resulting in a state that the inner ring is assembled to the rotational shaft is 20 mu m or more.

Description

technical field [0001] The present invention relates to a ball bearing and a supporting structure, in particular to a ball bearing and a supporting structure which are used in transmission devices of automobiles and which are supplied with lubricating oil from the axial direction for forced lubrication. Background technique [0002] A ball bearing that is supplied with lubricating oil in the axial direction and is forcibly lubricated is assembled on a transmission device of an automobile. As such a forcibly lubricated ball bearing, there is currently known a ball bearing having an annular portion and multiple extend in the axial direction and form recesses between each to hold the ball column portion as a rolling element, and have an axially inclined shape formed on the inner circular surface of the annular portion along substantially the entire circumference of the annular portion. The central side is a small-diameter inclined portion of the cage of the ball bearing. (For ...

AI Technical Summary

Problems solved by technology

[0012] In ball bearings with an inner diameter of 100 mm or more, if the radial clearance in the installed state is set to 20 μm or less as in the past, such large-diameter rolling bearings are particularly susceptible to thermal expansion, and there are differences depending on operating conditions. It may happen that the radial clearance becomes too small and the torque rises

[0013] In addition, in ball bearings with an inner diameter of 100mm or more, iron wave-type cages with spherical recesses imitating balls are generally used, but friction or wear may occur due to contact between balls and cages, and friction torque may increase. Large, which in turn causes problems such as reduced rotational performance at high speeds, skidding, etc.

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