Chain Sprocket Selection And Basic Knowledge

- Jul 02, 2018-

Chain sprocket have different classification. The chain is divided into transmission chain, transmission chain, stainless steel chain, lifting chain, agricultural machinery chain, etc.

Sprocket is divided into active sprocket and driven sprocket.

Active sprocket: the active sprocket is mounted on the engine output shaft by means of spline.

Driven sprocket: the driven sprocket is mounted on the driving wheel of the motorcycle, and the power is transferred to the driving wheel through the chain.

Generally, the active sprocket is smaller than the driven sprocket.

Performance characteristics of drive sprocket

Selection of materials - large sprocket and small sprocket are made of high quality carbon structural steel.

Handling technology: adopt advanced milling technology to make the shape of our teeth more accurate. The chain wheel has been subjected to mass conditioning treatment, which has greatly improved its comprehensive mechanical performance. The tooth hardness is over 68-72hra, and the wear resistance of the chain wheel has been significantly improved. The surface was sprayed with noise and electroplating.

Torque products series - economical and practical ordinary sprocket and superior quality sprocket.

Sprocket assembly

1. Active sprocket

The drive sprocket is combined with the engine output shaft in the form of spline and is fixed with spline baffle or nut. Remove the sprocket cover, remove the chain, screw the spline baffle or retaining nut, and pull the sprocket out. Assembly is carried out in the opposite order.

2. Driven sprocket

The main brace is mounted so that the rear wheel is tilted up.

Tighten nuts and regulator nuts on the rear axle and remove chain box and chain.

Detach the rear brake lever and pull the rear wheel assembly out together.

Unload the bolts, nuts or retaining rings for the fixed sprocket wheel and remove the hub or pin bolts at the back of the sprocket wheel.

Correspondingly, when installing, proceed in the opposite order. Tighten the sprocket retaining nut or bolt (30-50n) at the specified moment. M) and rear axle nut (50-80n). M).

Installation requirements and precautions for transmission sprocket

Installation requirements

Select the transmission sprocket correctly according to the vehicle specifications.

The position of the transmission sprocket (transmission output sub-shaft, hub, etc.) installed is checked to see if it is in good condition. Otherwise, it is necessary to repair or replace the relevant parts.

The main and driven sprocket is installed in place in the correct way and the fastener is tightened to meet the required torque.

After installing the transmission chain and adjusting the tightness, check whether the chain and sprocket cooperate smoothly and in the same plane without interference with the chain cover.


The radial driven sprocket shall have anti-loose measures.

(2) driven sprocket after loading, should use the regulator and the cradle (also called the rear fork) scribed line shaft after reset, this can prevent the rear wheel running deviation, and can also avoid the early wear of sprocket and chain.

The chain wheel and chain are best replaced at the same time. If only one of them is replaced, wear on both sides will be increased.

Owing to the high speed of the active sprocket and the low number of teeth, under the same conditions, it is normal to wear faster than the driven sprocket.

Rinsing and lubricating drive chains and drive sprocket wheels regularly to improve their service life.