12B Chain Sprocket

parameter for 12B chain sprocket:

Pitch 19.05

Internal width 11.68

Roller 12.07

Teeth NO: 8-125 

Characteristics of chain drive, 12B chain sprocket. 

Advantages (compared with belt drive): 

there is no slip and slip, and the accurate average transmission ratio can be maintained. 

compact transmission size. 

large tension is not required and the load on the shaft is small. 

High efficiency. 

able to work in high humidity and high temperature environment. 

chain drive can absorb vibration and mitigate impact. 

simple structure, low processing cost and low installation accuracy requirements. 

suitable for transmission with large center distance. 

able to work in harsh environment. 

Disadvantages for 12B chain sprocket: 

it can only be used for the same direction rotary transmission between parallel shafts. 

uneven instantaneous speed. 

poor stability at high speed. 

it is not suitable for occasions with large load change and rapid reversal. 

noise. 

the cost is high, and it is easy to jump teeth after wear.

Selection of sprocket material

For the plate sprocket that does not need heat treatment, it can be made of Q235, Q345 (16Mn), or 10, 20 steel. Generally, the hardness is below hb140, which is suitable for the processing of medium speed, medium power and large sprocket. The sprockets requiring heat treatment shall be made of 45 steel, 45 steel forging, 45 cast steel or 40Cr steel, which is suitable for the processing of driving and driven sprockets supporting high-strength chains in important occasions with large stress. Cast iron sprockets are mainly used in sprockets with low accuracy requirements or complex shapes, such as ring sprockets.

Shape and structure of common sprocket

Usually, the sprocket is composed of ring gear, hub and wheel width. Common sprocket shapes are:

Single piece single double row sprocket.

Single flange single double row sprocket.

Double flange single double row sprocket.

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