Four-point contact ball bearing

Abstract

The invention relates to a four-point contact ball bearing which comprises an outer ring, two separated inner rings, rolling bodies and a retainer, wherein pockets are uniformly distributed along the circumference of the retainer; the rolling bodies are respectively installed in pockets and arranged between the outer ring and the two inner rings; a fore shaft is formed at the inner side of each pocket on the retainer; each fore shaft comprises two arc-shaped merrowes which symmetrically expand to the central axis of the corresponding pocket; the total arc length of the two arc-shaped merrowesis two fifth or one third of the line contact arc length of the rolling bodies; and the arc-shaped merrowes and the hole walls of the pockets are in inclined plane transition. By the adoption of the invention, the assembly process can be simplified; the assembly efficiency and accuracy of the bearing are improved; the frictional resistance when the bearing operates is reduced; and the service life of the bearing is prolonged.

Description

technical field [0001] The invention relates to a four-point contact ball bearing, belonging to the technical field of bearings. Background technique [0002] The four-point contact ball bearing is a radial single-row angular contact ball bearing. The raceway is used to support the axial load acting in two directions. Compared with the double-row bearing, the occupied axial space will be significantly reduced. Small, it bears a large radial load and axial load at a high speed, so four-point contact ball bearings are mostly used in engines. The current four-point contact ball bearing includes an outer ring, two split inner rings, rolling elements and a cage. The cage is evenly distributed with pockets along the circumference, and each rolling element is respectively installed on the cage and arranged on the outer ring frame and the cage. Between the two inner rings, the cage plays the role of isolating the rolling elements at equal distances and preventing the rolling elemen...

AI Technical Summary

Problems solved by technology

The current four-point contact ball bearing includes an outer ring, two split inner rings, rolling elements and a cage. The cage is evenly distributed with pockets along the circumference, and each rolling element is respectively installed on the cage and arranged on the outer ring frame and the cage. Between the two inner rings, the cage plays the role of isolating the rolling elements at equal distances and preventing the rolling elements from falling, guiding and driving the rolling elements to rotate. The contact angle of the bearing is 35-45°. Since the size of the four-point contact ball bearing is mostly It is more than 150mm, so the outer ring, inner ring and cage are made of metal, especially the cage is made of copper alloy material, and the cage uses an inner lock. When the lock of the cage is too large, the rolling elements cannot enter In the pocket of the cage, and the lock of the cage is small, it will cause the rolling element to break away from the pocket

But at present, one kind of cage is to make the pocket hole into a cylindrical hole, install the rolling element in the pocket hole and then limit the rolling element through the riveting process. The pocket hole is partially deformed by the riveting process to form a lock, but The riveting process is not easy to ensure that the position of each lock is the same, and it is easy to cause different locks, which will reduce the precision of the bearing. Under the condition of high-speed operation, the bearing capacity of the bearing will be reduced, and noise will be generated, which will cause the bearing to fail in time. At the same time, this kind of The structural bearing also has the problems of complex assembly process and low assembly efficiency

For this reason, the cage of some four-point contact ball bearings uses a pair of evenly distributed stepped holes to limit the rolling elements. The stepped holes include inner locks and pocket holes, and the inner lock and pocket holes use cylindrical holes to simplify technology and improve assembly efficiency, but because the lock is composed of cylindrical holes, when the rolling body is pressed into the lock, the rolling body and the lock are in circular line contact, so it is added that the rolling body passes through the lock when it is assembled and pressed into the pocket. Therefore, it is necessary to increase the pressure when the rolling body is pressed into the lock to increase the difficulty of assembly, or to meet the installation requirements by reducing the lock amount of the lock, so it is difficult to achieve the goal of improving assembly efficiency and installation accuracy at the same time. Require

Furthermore, because the four-point contact ball bearing is installed in the engine, during high-speed operation, the contact area between the lock on the cage and the rolling element is large, which is prone to friction, wear and heat, which affects the normal use of the bearing.

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