Novel high-speed heavy-duty high-speed rail bearing

Abstract

The invention relates to a bearing, in particular to a high-speed heavy-duty high-speed rail bearing with a middle ball. The novel high-speed heavy-duty high-speed rail bearing is composed of an outerring with the middle ball, a deep groove ball bearing inner ring, two double-half inner rings and three rows of rolling bodies, wherein a deep groove ball bearing rolling body track is arranged in the middle of the inner circumference of the outer ring, circular roller tracks are respectively arranged on both ends of the deep groove ball bearing rolling body track at an interval, and circular rollers are respectively arranged in the tracks. A deep groove ball bearing structure is arranged in the middle of the inner circumference of the outer ring and between double sections of circular rollers or cylindrical rollers, the advantages of pure rolling friction of two-point contact of ball rolling bodies, high rotating speed and capability of bearing two-way combined load are fully used so asto design a mechanical structure of the middle ball, the scheme that the axial force of a roller contact angle bearing is increased by a double-section tapered roller bearing is replaced, roller deflection and frictional heating which are caused by stress concentration of the small end of a tapered roller can be effectively reduced, and the rotating speed and the rotary accuracy of the bearing areincreased. Because SKF bearing materials verify that the load carried by the rollers is uniformly distributed on the rollers and a raceway contact surface by virtue of the special circular cambered surfaces of the circular rollers, the middle ball is arranged between the double-row circular rollers, so that the radial bearing capacity of the bearing can be greatly increased, and low friction, lowtemperature rise and long service life are realized.

Description

technical field [0001] The invention relates to high-speed rail bearings. Background technique [0002] 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 a congenital fatal defect that cannot be cured, 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: when the rollers are skewed , its rolling surface is no longer in linear contact with...

AI Technical Summary

Problems solved by technology

[0003] 1. 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;

[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: 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 essence of the stress concentration, nor can it fundamentally correct the defects of its congenital mechanical structure;

[0005] According to the technical deficiencies of traditional high-speed rail bearings, in the previous utility model ZL201621332292, X "a new type of high-speed heavy-duty vehicle wheel bearing", the mechanical structure of the four-point contact of the center ball was used to replace the tapered roller bearing with the inclination angle. The design scheme of bidirectional axial load effectively reduces the frictional resistance and roller skew of the tapered rollers, but: the four-point contact ball bearing still has slight sliding friction when it bears pure radial load, and cannot withstand higher Running speed, 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 kilometers to 1,000 kilometers per hour. In-depth technical innovation,

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