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Analysis of disassembly performance of TIMKEN bearing

Bearing the demolition should be carried out as carefully as the installation. Attention to the TIMKEN bearing and the parts, in particular, interference with the removal of the bearing, the operation is very difficult. Therefore, in the design phase should be considered prior to the demolition, according to the need to design and manufacture of disassembly tool is also very important. In the demolition, according to the drawings of disassembly method, order, to investigate the bearing condition, in order to achieve the demolition job foolproof.

The outer ring of the interference fit is disassembled, and a screw is arranged on the circumference of the outer shell, and a screw is arranged on the outer ring of the outer shell. The screw holes are usually covered with a blind plug, a conical roller bearing, etc. the separation type bearing, in the case of the shoulder to set a few cuts, the use of the pad, the press is removed, or gently knock the demolition.

The inner ring of the demolition, you can use the pressure machine to pull out the latest simple. At this point, should pay attention to the inner ring to bear the pulling force.

The inner ring of large bearing is removed by hydraulic method. The oil pressure is arranged on the oil hole of the shaft so as to make it easy to draw. Width of TIMKEN bearings oil injection combined with drawing fixture, demolition work.

NU type, NJ type cylindrical roller bearing inner ring disassembly can use induction heating method. Heating the part in a short time, and the method of drawing the inner ring after the expansion.

Removing with a relatively small locking sleeve bearing, fastening the gear on the shaft block supporting inner ring and the nut back several times, the use of block with a hammer beating demolition.

Large bearings, hydraulic removal easier, the oil hole on the cone axis pressure oil, the inner ring expansion and disassembling bearing method. In operation, a bearing prolapse may suddenly, the best will use nuts as a block as well.

In TIMKEN bearing roller or rolling body surface, due to the role of alternating load to the surface of the contact surface of the metal flake off, and gradually expanded to form a pit. If the operation continues, the area will be formed. Due to improper installation or the hole of the bearing seat and the inclination of the center line of the shaft, the local area of the bearing will be subjected to heavy load and the early fatigue damage will occur.

Defects in material and heat treatment improper interference fit is too big, improper combination design, such as bearing surface grooves are caused by stress concentration, will form a ring crack and fracture.

When the external hard grain material enters the TIMKEN bearing and is pressed between the rolling body and the rolling path, the rolling surface can form an impression. In addition, too large impact load can also cause the contact surface to generate a local plastic deformation and the formation of pits. When the bearing is stationary, even if the load is very small, due to the vibration of the surrounding environment, it will form a uniform distribution of pits in the rolling path.

When the rolling bearing seal is not good, so that dust or particulate matter into the bearings, or lubrication, the contact surface will cause more serious scratches or wear, and the bearing vibration and noise increases.

Current through the bearing, will produce a small electric spark, resulting in contact with the surface of the local annealing and the emergence of small pits or black highlights. The situation is serious into the larger pit.

Water or acid, alkali, salt substances such as the invasion of bearing or improper selection of lubricant will be cited from the bearing rust, precision bearings even minor corrosion will make the bearing scrap.

Timken bearings, especially the high-speed bearing, due to the lack of lubricant, the retainer and rolling contact or ring of abrasion, impact, and even lead to fracture of cage.


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