Detailed explanation: TIMKEN thrust ball bearing

Thrust ball bearings are introduced in a bondable construction because the device is easy because the seal and ball and cage assembly can leave the device. The two-way thrust ball bearing consists of a shaft collar, two bearing races, and two ball and cage thrust assemblies. Bearings can be combined because the device is easy. Each can leave the device. The bearing races as well as the ball and cage assemblies are identical to the one-way bearings.

The thrust ball bearing is a combined bearing, and the shaft ring and the seat ring can be combined with the components of the maintenance frame and the steel ball. The collar is a ferrule that cooperates with the shaft. The race is a ferrule that cooperates with the bore of the bearing housing and has a gap between the shaft. According to its construction, it is divided into one-way thrust ball and two-way thrust ball bearing.

One-way thrust ball bearings accept axial loads in one position, and two-way thrust ball bearings accept axial loads in two positions. They all make it impossible to accept radial loads. The one-way thrust ball bearing consists of a shaft collar, a bearing race, and a ball and cage thrust assembly.

The two-way thrust ball bearing is capable of accepting axial loads in two positions and is a two-way flow machine shaft. Such bearings must not accept any radial loads. The thrust ball bearing has a structure with a seat cushion. Since the device surface of the seat cushion is spherical, the bearing is in a self-aligning function, which can reduce the reaction of the device error. Thrust ball bearings are important for buses and machine tools.

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Key points for heavy-duty bearing selection

The main points of heavy-duty bearing selection are basically the same as those for high-rigidity bearings.

The application of heavy-duty bearings must be considered in conjunction with the working characteristics of heavy-duty bearings. Heavy-duty bearings are often in high-stress conditions, and bearings are sensitive to high stresses. Therefore, all aspects of the application technology must strive to slow the stress of the bearing, and the stress reduction is very beneficial to extend the life of the bearing. For example, a high-load machine can multiply a single bearing of a certain fulcrum to two to withstand the radial load under the condition of the axial position, and the fulcrum is under the same workpiece condition despite the influence of load unevenness. The life of the two bearings is expected to increase by more than two times compared to the original single bearing. In fact, heavy-duty machines often use multiple bearings or multiple rows of bearings at one fulcrum to withstand radial loads.

1. Heavy-duty bearing coordination, clearance and lubrication

The fit, clearance and lubrication of heavy-duty bearings must be considered uniformly.

In order to reduce the stress of heavy-duty bearings, it is desirable to have a thicker lubricating film layer, so it is preferred to use a higher viscosity lubricating oil or a higher viscosity oil as a base oil grease, and at the same time, in the case of ensuring good lubrication, Do not use too much frictional torque due to lubricant viscosity

The interference interference of the heavy-duty bearing rotating ferrule is larger than the normal situation, and this has an adverse effect on the deformation of the raceway and the bearing life. Therefore, if possible, it is desirable to reduce the interference properly, which requires lowering the mating surface. Roughness, while maintaining normal lubrication, because the lubrication fails, the excessive frictional torque on the surface of the heavy-duty lower raceway strengthens the creeping tendency of the mating surface, and even slips, although these phenomena occur mostly in the outer ring, but when severe The inner ring is also inevitable. The actual fit of the outer ring should not cause excessive gaps to prevent the grease from penetrating into the surface, which promotes the occurrence of slipping, and makes the ferrule easy to deform and reduce the bearing area of ​​the bearing.

Only after careful and effective measures are taken, it is allowed to appropriately reduce the interference of heavy bearings. However, although the interference is slightly reduced, the improvement of the bearing stress state is greater. Of course, the advantage of thickening the oil film is greater.

Due to the large contact area of ​​the rolling surface of the bearing under heavy load and the tight fit, the ferrule is close to the amount and deformation, so the clearance of the bearing is usually larger.

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