High-speed rail bearing with high speed, heavy load and low friction

Abstract

The invention relates to a bearing, in particular to a high-speed rail bearing with high speed, heavy load and low friction. The high-speed rail bearing with high speed, heavy load and low friction isformed by an outer sleeve ring, a deep groove ball bearing inner sleeve ring, two double half inner sleeve rings and three rows of rolling elements. A circle of deep groove ball rolling element railis arranged in the middle of an inner circle of the outer ring; a ball rolling element is arranged in the rail; a circle of spherical roller rail is arranged on each of two ends of the deep groove ball rolling element rail; spherical rollers are arranged in the spherical roller rails; the deep groove ball bearing inner sleeve ring is arranged in the middle of the inner circumference of the outer sleeve ring; through the combination of the ball rolling element and the deep groove ball rolling element rail arranged in the middle of the outer sleeve ring, a middle ball structure of a ball bearingis formed; reverse spherical roller rails are arranged on the outer circumferences of the two double half inner sleeve rings and are arranged on two sides of the deep groove ball bearing inner sleevering; and through the combination of the spherical rollers and a spherical roller rail arranged on the inner circumference of the outer sleeve ring, a reverse spherical roller bearing structure is formed. According to the high-speed rail bearing with high speed, heavy load and low friction provided by the invention, a combined load is borne by utilizing the advantage of two-point contact pure rolling friction of the ball rolling element, so that the rotation speed and the rotation accuracy of the bearing are improved; and the curvature radius of each roller rail is enlarged through each reverse spherical roller rail, so that a contact angle of the rollers is reduced, and the aims of high speed, heavy load, low friction and low temperature rise are achieved.

Description

technical field [0001] The invention relates to high-speed rail bearings. Background technique [0002] 1. At present: the high-speed rail bearings manufactured by developed countries in the world are still tapered roller bearings manufactured on the basis of advanced bearing materials and technology. Research data show that there are many fatal defects in the mechanical structure of tapered roller bearings, such as: [0003] (1) Stress concentration: The stress concentration at the end of the tapered roller bearing roller is an irreversible congenital fatal defect, and its common main hazard is to cause raceway indentation and peeling; [0004] (2) The rollers are easy to skew: The biggest congenital fatal flaw of tapered roller bearings is that the uneven force on the contact line of the rollers during rotation can easily make the rollers skew. The mechanical concept of roller skew is: the rollers are skewed When the rolling surface is no longer in linear contact with the...

AI Technical Summary

Problems solved by technology

[0003] (1) Stress concentration: The stress concentration at the end of the tapered roller bearing roller is an irreversible congenital fatal defect, and its common main hazard is to cause raceway indentation and peeling;

[0004] (2) The rollers are easy to skew: The biggest congenital fatal flaw of tapered roller bearings is that the uneven force on the contact line of the rollers during rotation can easily make the rollers skew. The mechanical concept of roller skew is: the rollers are skewed When the rolling surface is no longer in linear contact with the raceway, it is tightly stuck between the raceways of the inner and outer rings at a certain angle like a wedge, and slides and rubs against the inner and outer rings, causing the rolling body One end is indented or peeled off, and the other end is severely worn, which directly causes ring raceway indentation, peeling, cage cracking or rib cracking, which often occurs in wheel bearings of heavy-duty vehicles. The method of sub-convexity reduces the stress concentration of the roller end, but still cannot change the mechanical nature of the stress concentration, nor can it fundamentally correct the defects of its congenital mechanical structure;

[0009] Because the mechanical principle of the combined load of the tapered roller bearing is realized by the size of the roller contact angle (inclination angle), the tapered roller bearing directly distributes the received load on both the radial and axial sides of the bearing according to the size of the contact angle. One direction, that is: directly derive a constant axial force, and lead to serious congenital defects, that is: the load on the bearing cannot automatically adjust the optimal ratio of the combined load with different working conditions, so that the axial and radial directions of the bearing are always In the set force state, the axial force caused by the contact angle is the same as the principle of the lateral adjustment nozzle of the rocket jet engine. What a danger it will be! ?

[0010] The same principle applies to the operation of high-speed rail. If the high-speed rail runs in a straight line for a long time without a large axial load, however: the tapered roller still derives the axial load according to the contact angle (inclination angle) of the roller and thus The resulting frictional resistance and frictional wear are always imposed on the bearing as a shadow, which will not only cause insufficient radial load of the bearing, but also cause unnecessary increase in bearing frictional resistance and frictional wear, increase frictional heat, and cause the rollers to skew Sliding and other hazards,

[0011] 2. Research and practice have found that: the radial spherical roller bearing also has great defects and limitations in the design of the mechanical structure. The radius of the spherical roller track is restricted by the bearing radius, and the radius of the spherical track must be smaller than the bearing radius. It directly causes the congenital curvature of the spherical roller track to be too large, so that the actual application range of the self-aligning bearing roller track is very narrow, and only a very narrow circle of spherical surface with the largest diameter of the spherical surface can be used, so the setting of the roller length is very short. Any method of increasing the roller length and roller contact angle will lead to the thrust spherical roller bearing effect, which will directly lead to an unnecessary increase in the axial bearing capacity and a decrease in the radial bearing capacity of the radial spherical roller bearing, and may cause The sharp increase of frictional resistance and frictional heat of the bearing and the sharp decrease of the rated speed are the congenital defects and limitations of the radial spherical roller bearing, which greatly restrict the adjustment of the limit speed and combined load of the radial spherical roller bearing. Restrictions, and make the many advantages of spherical roller bearings unable to exert greater application value in a wider range of fields,

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