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Brass bushing has high flexibility and radial runout
- May 25, 2018 -

Brass bushings are mainly used outside the mechanical parts in the process of use, so that it can effectively achieve its sealing, wear protection and other supporting parts, to a certain extent, refers to the role of the liner ring. In the field of valve applications, the bushing is in the bonnet and generally uses PTFE or graphite corrosion resistant materials for sealing.

Brass bushings have high flexibility during use and many functions can be effectively used during use. In general, bushings are a type of component that protects equipment. The use of bushings can reduce equipment wear, vibration and noise, and have anti-corrosion effects. The use of bushings also facilitates the maintenance of mechanical equipment and simplifies the structure and manufacturing process of the equipment.

The main role of the brass bushing in its actual working process has a lot to do with the purpose of the environment in which it is actually applied. In its valve application field, the bushing is installed in the valve cover to cover the valve stem. To reduce the leakage of the valve to achieve sealing effect. In bearing applications, the use of a bushing can reduce the wear between the bearing and the shaft seat and prevent the clearance between the shaft and the hole from increasing.

Brass bushing in the process of production in the different size of the short allowable difference will be from +0.018-0.09 is the upper direction of the request to set the cone angle difference can only be large and can not be small, that is, the big end must meet the contact, small cone The end can be a little gap, the cone and hole are not well matched, and the self-aligning roller bearing will form a single row of roller under stress, unstable operation, large vibration, loud tone, easy loosening, short bearing life, high precision. The difference between the set cone angle should also be ≤ 0.005 to ensure that the contact area is not less than 90%.

Brass bushings must have high accuracy in the radial run-out of the outer cone facing the inner bore (which is usually called the difference in wall thickness). Otherwise, the centripetal force of the shaft due to a fair amount of force will not jolt, and the vibration will be great. The difference in wall thickness is "0" is the ideal form. The maximum value of the national standard rule bearing diameter below 65 is the size of the maximum clearance of the bearing specification group about 1/2, and the maximum clearance value of Class C accuracy is very large, so the national standard qualified sleeve product is used in the fine-grade large load Bearing support is not enough.