Novel high-speed rail axle power bearing

Abstract

The invention relates to a bearing, in particular to a high-speed rail power bearing of a variable-diameter middle ring with a neutral ball. The novel high-speed rail axle power bearing is composed ofthe variable-diameter middle ring with the neutral ball, two double-half outer rings, a deep groove ball bearing outer ring, two double-half inner rings and two layers of inner and outer rolling bodies, wherein a mechanical structure of a double-row angular contact ball bearing or a deep groove ball bearing is arranged in the middle of the inner and outer circumference of the variable-diameter middle ring and between double rows of circular rollers or double rows of cylindrical rollers. The advantage of pure rolling friction of two-point contact of ball rolling bodies is used for bearing two-way combined load so as to form a mechanical structure of the neutral ball, the radial bearing capacity of the bearing can be greatly increased, and the rotating speed and the rotary accuracy of the bearing are effectively increased, so that high speed, low friction, low temperature rise and long service life of the bearing are realized.

Description

technical field [0001] The invention relates to high-speed rail bearings and auxiliary bearings for various suspension trains. Background technique [0002] At present: the high-speed rail bearings manufactured by developed countries in the world are still traditional single-layer tapered roller bearings with full friction based on advanced bearing materials and technology. Research data show that there are many fatal flaws in the mechanical structure of traditional tapered roller bearings, such as: [0003] 1. In the traditional single-layer tapered roller bearing, between the rollers and the raceways of the inner and outer rings, between the rollers and the cage, and between the rollers and the grease will act on the bearings in the process of rotating and doing work. 1 / 2 of the driving force is converted into frictional heat energy. Therefore: the frictional resistance and wear produced by traditional bearings must be large, easy to generate heat, and have poor high-speed...

AI Technical Summary

Problems solved by technology

[0003] 1. In the traditional single-layer tapered roller bearing, between the rollers and the raceways of the inner and outer rings, between the rollers and the cage, and between the rollers and the grease will act on the bearings in the process of rotating and doing work. 1 / 2 of the driving force is converted into frictional heat energy. Therefore: the frictional resistance and wear produced by traditional bearings must be large, easy to generate heat, and have poor high-speed performance, which can directly lead to many safety hazards in high-speed rotation of bearings.

[0004] 2. Stress concentration: The stress concentration at the end of the tapered roller bearing roller is a congenital fatal defect that cannot be cured, and its common main hazard is to cause raceway indentation and peeling.

[0005] 3. 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: when the rollers are skewed , its rolling surface is no longer in linear contact with the raceway, but 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, resulting in one end of the rolling body Indentation or spalling, the other end is severely worn, directly causing ring raceway indentation, peeling, cage cracking or rib cracking, which often occurs in wheel bearings of heavy-duty vehicles, and currently developed countries are using additional rollers The method of 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 innate mechanical structure.

[0006] According to the technical deficiencies of traditional high-speed rail bearings, in the previous utility model ZL201621332291, 5 "a new type of high-speed rail dynamic bearing", the mechanical structure of the four-point contact of the center ball was used to replace the tapered roller bearing the two-way axial bearing with the inclination angle. The load design scheme effectively reduces the friction resistance and roller skew of the tapered rollers, but: the four-point contact ball bearings still have slight sliding friction when bearing pure radial loads, and cannot withstand higher operating speeds. With people's higher demand for travel, China's high-speed rail is currently marching towards high-speed rail with a speed of more than 400 kilometers per hour and maglev trains with a speed of 600 to 1,000 kilometers per hour. Therefore: the present invention has carried out in-depth technical innovation on high-speed rail bearings,

Images