Thrust Spherical Roller Bearings

Composition

Thrust ball bearing composition: Thrust ball bearing consists of three parts: seat washer, shaft washer and steel ball cage assembly. The shaft washer matched with the shaft and the seat ring matched with the housing.

Type

Thrust ball bearing

According to the force, it is divided into one-way thrust ball bearings and two-way thrust ball bearings. One-way thrust ball bearing can bear one-way axial load. Two-way thrust ball bearing can bear two-way axial load, in which the shaft ring is matched with the shaft. Bearings with a spherical mounting surface of the seat ring have self-aligning performance and can reduce the influence of mounting errors. Thrust ball bearings cannot bear radial loads and have a low limit speed.

Features

1. There are two types of one-way and two-way. 2. In order to allow installation errors, whether it is one-way or two-way, you can choose spherical self-aligning spherical seat type or spherical seat type. 3. High-quality steel - Ultra-clean steel that can extend bearing life up to 80% 4. Advanced grease technology - NSK's lubricant technology extends grease life and improves bearing performance 5. High-grade steel balls - Quiet and smooth rotation at high speed 6. With the optional ferrule, installation error can be tolerated.

Use

The use of thrust ball bearings: It is only suitable for parts that bear an axial load on one side and have a low speed, such as crane hooks, vertical water pumps, vertical centrifuges, jacks, low-speed reducers, etc. The shaft washer, seat washer and rolling element of the bearing are separated and can be assembled and disassembled separately.

Assembly

There are two key points in the assembly of thrust ball bearings. One is the control of the pressing quality of the cage and the steel ball, and the other is the control of the nominal height T after the bearing is assembled. In addition, since the shaft ring and the seat ring can be separated, it brings a management problem. It is to prevent the mixing of imported bearing parts. The M-type stamping cage uses a flanged assembly die. After pressing, the steel ball is required to rotate flexibly in the pocket, but it cannot fall off from the pocket, and the technical regulations check the amount of movement of the steel ball in the pocket. If the solid cage is imprinted too deeply, the movement of the steel ball will be small, and the connection between the embossed convex part and the cage is too small and the strength is insufficient, which is prone to the phenomenon of falling blocks, causing the cage to be scrapped. There is little difference between the inner diameter of the small thrust ball bearing seat washer and the shaft washer, and there is no obvious difference between the two sets. In order to prevent the phenomenon of mixed sets, it is found that two sets of bearings are both seat washers or shaft washers in the assembled set of bearings. This requires certain measures. Usually, the drawing ring and the seat group are distinguished by auxiliary tooling when the sleeve is assembled, or the inner diameter size is checked with an inner diameter plug gauge before sampling the nominal height. For the convenience of checking the inner diameter, put the seat ring on the bottom and the shaft ring on the top. If the inner diameter of the seat ring has obvious quenching heating oxidation color or has not been ground, it is not necessary to check the inner diameter size, and the difference between the shaft washer and the seat ring can be clearly seen, and it is not easy to mix. After the thrust ball bearing is assembled, the nominal height T needs to be measured to confirm whether it is qualified. When measuring, calibrate with a height block or standard part, and measure the load, the bearing needs to be rotated dozens of times, and the minimum height must be reached.

When the thrust ball bearing operates at high speed, the contact angle between the steel ball and the radial plane of the raceway will be affected by centrifugal force, which will cause the sliding of the steel ball relative to the raceway. Adhesive wear from this sliding can damage the bearing. To prevent this damage, the minimum load on the thrust ball bearing must be guaranteed, see Equation 1 or Equation 2, whichever is the larger of the calculated values.

Formula 1: Famin=K・n*n

Formula 2: Famin=Coa/1000

Famin: Minimum axial load (N)

K: Minimum axial load factor

n: rotation speed (per minute)

Coa: Basic static load rating (N)

The one-way thrust ball bearing can only bear the load in one direction, if it bears the load in two directions, the two-way thrust ball bearing must be selected. Thrust ball bearings must have a minimum load or preload applied. When the shaft is vertical, the weight of the shaft usually exceeds the minimum load. At this time, the acting load may be reduced due to the influence of the axial external load in the opposite direction.

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