Integrated ferrule four-point contact ball bearing

Abstract

The invention discloses an integrated ferrule four-point contact ball bearing. The integrated ferrule four-point contact ball bearing comprises a bearing inner ring, balls, an outer ring and a retainer, wherein the bearing inner ring and the bearing outer ring are respectively provided with an annular roll way, each annular roll way is in two-point contact with one ball, and the included angle beta i between two contact points and a ball center connecting line and the included angle beta o between the other two contact points and the ball center connecting line both range from 20 degrees to 150 degrees; the balls are internally tangent with a curve of the roll way of the inner ring and a curve of the roll way of the outer ring respectively, a radial clearance is formed between the outer ring and the corresponding ball, another radial clearance is formed between the inner ring and the corresponding ball, the curvature radius ri of a section profile curve of the annular roll way of the inner ring is 1.01-1.16 times of the radius r of each ball, and the curvature radius ro of a section profile curve of the annular roll way of the outer ring is also 1.01-1.16 times of the radius r of each ball. Due to the fact that the clearances are formed between the balls and the annular roll ways, the lubrication conditions of the bearing can be improved, and the fatigue life of the bearing can be prolonged; the balls and the annular roll ways are well matched, so that the service life of the bearing is long.

Description

technical field [0001] The invention belongs to the technical field of bearings, in particular to rolling ball bearings. Background technique [0002] In the currently widely used standards (Chinese national standards and international standards, etc.), ball bearings include bearing inner rings, balls, outer rings and cages. The balls are placed in the cages, evenly separated by the cages, and set in the bearing. Between the inner ring and the outer ring, there are annular raceways on both the inner and outer rings of the bearing. Arc and straight line (standard angular contact ball bearing), and the arc radius of the circular raceway section profile is greater than the radius of the ball. When loaded, the ball contacts the inner ring and the outer ring at one point respectively. A disadvantage of these standard ball bearings is the high radial load on the balls at the point of contact. [0003] In order to reduce the problem of large radial load at the contact point of st...

AI Technical Summary

Problems solved by technology

Its shortcomings are: 1. The radial clearance between the ball and the inner and outer rings is not determined when there is no load, because the radial clearance between the ball and the inner and outer rings when the ball is in four-point contact is no longer applicable to the standard The radial clearance standard between the ball bearing and the inner ring and the outer ring is difficult to design and manufacture without the radial clearance parameters between the ball and the inner ring and the outer ring; 2. When the radial load is applied, the ball and the There are four points of contact between the inner ring and the outer ring. The arc radii of the raceway sections of the inner ring and the outer ring are larger than the radius of the ball. The angle β between the two contact points and the connecting line of the ball center is between 30° and 120° , the radial load on each of the two contact points is less than the radial load on a standard ball bearing at one point of contact, but when the arc radius is too large, the ball will contact the inner and outer ring raceways The reduced fit will cause the maximum contact stress at each contact point to be greater than that of standard ball bearings, even if the radial load on each contact point of the ball bearing is half of that of standard ball bearings (actually more than half ), but since the maximum contact stress at each contact point will be greater than the maximum contact stress of standard ball bearings, it does not improve the life of ball bearings

In this patent embodiment, the arc radii of the cross-sectional contours of the inner ring and outer ring raceway are equal to 2.1 times the ball radius. According to the calculation theory of rolling bearings, the degree of coincidence between the contact between the ball and the inner ring and outer ring raceway is only 0.47619, when the "V" shape is straight, the degree of fit between the ball and the raceways of the inner ring and outer ring is 0; it is far lower than the degree of fit of the standard ball bearing 0.94340~0.98039, so the life of the ball bearing is not higher than Standard ball bearing life

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