Basic knowledge learning of transmission sprocket

The sprocket is divided into a driving sprocket and a driven sprocket. The driving sprocket is installed on the output shaft of the engine in the form of splines; the driven sprocket is installed on the driving wheel of the motorcycle, and the power is transmitted to the driving wheel through the chain. The driving sprocket is smaller than the driven sprocket, which can reduce the speed and increase the torque.

Performance characteristics of drive sprocket

①The selection of materials-both the large sprocket and the small sprocket are made of high-quality carbon structural steel for stamping and forming.

②Machining and processing technology-the use of advanced milling processing technology to make the tooth profile more accurate. The entire sprocket has undergone quenching and tempering heat treatment, which greatly improves its comprehensive mechanical properties. The tooth profile hardness is above 68-72HRA, which significantly improves the wear resistance of the sprocket. The surface has been sprayed and electroplated.

③Product series-economical and practical ordinary sprocket and superior quality sprocket.

Disassembly and assembly of sprocket

1. Active sprocket

The driving sprocket is combined with the engine output shaft in the form of a spline, and is fixed by a spline baffle or a nut. When disassembling, the sprocket cover can be removed, the chain can be removed, and the spline baffle or fixing nut can be unscrewed to pull out the small sprocket. When assembling, proceed in the reverse order.

2. Driven sprocket

① Support the main support frame and tilt the rear wheel.

②Loosen the rear wheel shaft fastening nut and adjuster nut, and remove the chain box and chain.

③ Disassemble the rear brake lever and pull out the rear wheel assembly together.

④Remove the bolts, nuts or retaining rings that fix the sprocket, and remove the rear hub or pin bolts of the sprocket.

⑤When installing, proceed in the reverse order. And tighten the sprocket fixing nut or bolt (30-50N.M) and the rear axle nut (50-80N.M) according to the specified torque.

Installation requirements and precautions of transmission sprocket

Installation requirements

①Select the drive sprocket model correctly according to the model specifications.

②Check whether the position where the drive sprocket is installed (transmission output countershaft, wheel hub, etc.) is in good condition, otherwise the relevant parts must be overhauled or replaced.

③Install the main and driven sprockets in place according to the correct method, and tighten the fasteners to meet the specified torque requirements.

④After installing the drive chain and adjusting the tightness, check whether the chain and the sprocket are smoothly matched, coplanar, and there is no interference with the chain cover.

Precautions:

①The driven sprocket should have anti-loosening measures.

②After loading the driven sprocket, adjust the rear wheel axle with the adjuster and the rear cradle (also called the rear wheel fork) markings, so as to prevent the rear wheel from deviating, but also to avoid the early stages of the sprocket and chain. Wear.

③It is best to replace the sprocket and the chain at the same time. If only one of them is replaced, the wear of both sides will be aggravated.

④Due to the high speed of the driving sprocket and the small number of teeth, it wears faster than the driven sprocket under the same conditions, which is a normal situation.

⑤ The drive chain and drive sprocket should be cleaned and lubricated regularly to improve their service life.