High-speed rail bearing provided with reverse spherical roller track

Abstract

The invention relates to bearings, in particular to a high-speed rail bearing provided with a reverse spherical roller track. The high-speed rail bearing provided with the reverse spherical roller track consists of two double-half inner ferrules, an outer ferrule and two rows of spherical rollers, the outer circumferences of the two double-half inner ferrules are respectively provided with a circle of reverse spherical roller track, the two double-half inner ferrules are coaxially arranged on the inner circumference of the outer ferrule, the outer circumferences of the two double-half inner ferrules form a shared reverse spherical roller track after the two double-half inner ferrules are coaxially combined, the curvature radius of the shared reverse spherical roller track is larger than the radius of a bearing roller circumferential track, a circle of spherical roller track is correspondingly arranged at each of the two ends of the inner circumference of the outer sleeve ring at an interval, an angle of 1-20 degrees is formed between each spherical roller track and the vertical axis of the bearing, a spherical roller is arranged in each spherical roller track, and the bearing structure provided with the reverse spherical roller track is formed by combining the spherical rollers with the shared reverse spherical roller track arranged on the outer circumferences of the inner ferrules. The curvature radius of the reverse spherical roller track created by the invention can be multiplied, the combined load ratio of the spherical roller bearing can be greatly adjusted, the contact angles of the rollers are effectively reduced, and the purposes of high speed, heavy load, low friction, low temperature rise and long service life 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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