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NTN Thrust ball Bearing
- Category: Thrust ball Bearing
- Description:Thrust ball bearings are designed to withstand thrust loads at high speeds and consist of gasket rings with ball...
- Email:admin@jngybearing.com
- TEL:+86 15165026537
- Company:Ji'nan Guang Yue Pml Precision Mechanism Ltd Of China
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Thrust ball bearings are designed to withstand thrust loads at high speeds and consist of gasket rings with ball rolling raceway grooves. Because the rings are cushions, thrust ball bearings are divided into two types: flat bottom cushion type and center adjusting spherical cushion type. Besides, the bearing can bear axial load, but it can not bear radial load.
Thrust ball bearings: thrust ball bearings are composed of three parts: seat rings, shaft rings and steel ball cage components. The shaft ring which is matched with the shaft is called the seat ring matched with the outer shell.
Species:
One way thrust ball bearings and two way thrust ball bearings are divided according to the force condition.
Unidirectional thrust ball bearings can withstand uniaxial load. Two way thrust ball bearings can bear two-way axial load, in which the shaft ring fits the shaft. The bearing surface of the seat is spherical, which has the function of adjusting the center, and can reduce the influence of installation error. Thrust ball bearings can not bear radial load and limit speed is low.
Characteristic
There are two types of 1. ones in one way and two ways
2. in order to allow installation errors, either spherical or bidirectional, spherical aligning spherical seat or ball face seat type can be selected. 3. high quality steel - the use of the super clean steel 4. height that can prolong the life of the bearing 80% - NSK lubricant technology can prolong the life of the grease and improve the performance of the bearing 5. high grade steel ball - quiet and smooth 6. use of the ring in the selection of the selected parts at high speed, allowing for installation error.
purpose
Use of thrust ball bearing: it is only suitable for the parts with one axial load and low speed, such as crane hoisting hook, vertical pump, vertical centrifuge, Jack, low speed reducer and so on. Bearing rings, seat rings and rolling bodies are detached and can be detached separately.
There are two key points in the thrust ball bearing assembly. One is the quality control of the cage and the steel ball, and the other is the control of the nominal height T after the bearing assembly. In addition, due to the separation of the shaft rings and the seat rings, a management problem is brought about. The M type stamping holder uses a curved edge assembly mold. After pressing, the ball is required to rotate flexibly in the pocket hole, but it can not fall off from the pocket, and the technical regulations check the momentum of the ball in the pocket. The pressure of the solid retainer press too deep will make the ball move small, and the connection of the embossing and protruding part and the cage is too little and the strength is insufficient, it is easy to drop the block phenomenon and cause the cage to be scrapped. The size difference of the inner diameter of the small thrust ball bearing ring and the axle ring is very small, and there is no obvious difference between the two sets. In order to prevent the phenomenon of mixing, a set of bearings found that two are both the seat ring or the shaft ring. It is necessary to take some measures. Usually, the ring is distinguished by the auxiliary tooling, or the inner diameter is checked with the inner diameter gauge before the nominal height. In order to check the inner diameter, the seat ring is placed below, and the shaft is placed on the top. If the inner diameter of the seat ring has obvious quenching and heating oxidation color or no grinding, it is not necessary to test the diameter of the inner diameter, and can clearly see the difference between the ring and the seat ring, and it is not easy to mix. After assembling the thrust ball bearing, the nominal height T should be measured to confirm whether it is qualified. When measuring, use height blocks or standard parts to calibrate and measure loads. The bearing needs to be rotated for dozens of times, and the minimum height must be reached.
When the thrust ball bearings operate under high speed conditions, the contact angle of the radial plane of the ball and the raceway will be influenced by the centrifugal force, thus causing the sliding of the relative raceway of the ball. The adhesive wear caused by this sliding will damage the bearing. To prevent this damage, we must ensure the minimum load borne by the thrust ball shaft, see Formula 1 or formula 2, take the larger value of the calculated value.
Formula 1:Famin=K. N*n
Formula 2:Famin=Coa/1000
Famin: minimum axial load (N)
K: minimum axial load coefficient
N: speed (per minute)
Coa: basic rated static load (N)
Unidirectional thrust ball bearings can only bear one direction of load. If we bear the load in two directions, we must choose two way thrust ball bearings. Thrust ball bearings must be subjected to minimum load or preload. When the axle is vertical, the weight of the shaft usually exceeds the minimum load. At this time, due to the influence of axial external load in opposite direction, the load of this action may decrease.
