Pulley is a simple machine used to lift heavy objects and save effort.


Bushing is used for mechanical parts, in order to achieve the function of sealing, wear protection and other supporting parts, refers to the role of gasket ring. In the field of valve application, the bushing is in the valve cover. Generally, PTFE or graphite and other corrosion-resistant materials are used for sealing.

In the moving parts, because of the long-term friction and wear of parts, when the gap between the shaft and the hole wear to a certain extent, the parts must be replaced. Therefore, the designers choose the material with lower hardness and better wear resistance as the shaft sleeve or bushing in the design, which can reduce the wear of the shaft and seat.

Features are:

Low frictional resistance: The steel ball can perform stable linear motion with extremely small frictional resistance due to the correct orientation of the retainer.

Stainless steel

Stainless steel: stainless steel series are also available, suitable for applications requiring corrosion resistance.

Exquisite design

Exquisite design: extremely small in size and can be designed in exquisite mechanical equipment.

Rich variations

Rich variations: In addition to the standard type, there are also a series of high-rigidity long types, which can be selected according to the purpose.


The pulley is a small wheel with grooves on the periphery and capable of rotating around an axis.

The role of the bushing

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The flexibility of the bushing is relatively high, and it can play a lot of roles. Generally speaking, the bushing is a kind of component that protects the equipment. The use of bushings can reduce equipment wear, vibration and noise, and has an anti-corrosion effect. The use of the bushing can also facilitate the maintenance of mechanical equipment and simplify the structure and manufacturing process of the equipment.

Classification, number

Fixed pulley, movable pulley, pulley block (or divided into single pulley, double pulley, three pulley, four pulley and even multiple pulleys).


Wooden pulleys, steel pulleys and engineering plastic pulleys can be made of various materials according to actual requirements.


Pull the load, change the direction of force, transmit power, etc.

Connection method

Hook type, chain link type, wheel type, ring type and chain type, diagonal pull type, etc.

Dimensions and materials

Small-size pulleys (D<350mm) that can withstand a small load are generally made of solid pulleys, using 15, Q235 or cast iron.


When using a pulley, a pulley whose shaft position is fixed is called a fixed pulley.


Bushing has a wide range of use and many types. To choose a suitable bushing, you must consider its purpose of use, and choose different types of bushings for different working conditions.


large torque, high accuracy, convenient and quick assembly and disassembly, simple operation, good positioning, reduced scrap rate of matched shafts and hubs, reusable use, and no damage to the mating surface. It is currently the most ideal and economical choice.