Sprocket wheel is widely used in chemical, textile machinery, food processing, instrumentation, oil and other industries mechanical transmission
Sprocket parameter calculation formula
Pitch circle diameter: d = p / sin180 ° / z
Addendum circle (outer diameter): D = p × (0.54 + cot180 ° / z)
Pitch circle diameter: d = p / sin (180 ° / z)
Addendum circle diameter: dmax = d + 1.25p-d1
dmin = d + (1-1.6 / z) p-d1
Root diameter: df = d-d1
p ——Chain pitch (Common sprocket pitch:3/8, 1/2 ,5/8 ,3/4 )
Z ——number of teeth of the sprocket
d1——chain roller diameter
common processing method：quenching, black surface treatment.
Sprocket tooth options
1)Z>19,usually the drive sprocket for high-speed operation under normal operating conditions.
2)Z=17, only for small pitch drive sprocket.
3)Z<23recommended for the impact of the case.
When the ratio is low, the high number of sprocket teeth can greatly reduce the moment of inertia, tensile load and load bearing chains.
Sprocket material
Sprocket materialshould ensure that the sprocket tooth is sufficient strength and wear resistance. The sprocket tooth surfaces are generally heat-treated to achieve a certain hardness.
Sprocket Material
Heat Treatment
Tooth Surface Hardness
Applications
15,20
carburizing, quenching, tempering
50-60HRC
an impact load sprocket Z<25
35
normalizing
160-200HBS
sprocket Z＞25
45,50，ZG310-579
quenching, tempering
40-45HRC
no severe shock and vibration
15Cr,20Cr
carburizing, quenching, tempering
50-60HRC
high-power drive sprocket Z<25
40Cr,35SiMn,35CrMo
quenching, tempering
40-50HRC
high strength and wear resistance
A3,A5
weld annealing
140HBS
in low and medium power larger sprocket
>HT200
quenching, tempering
260=280HBS
Z>50
Bakelite
P<6kw,high speed, stable transmission.
little noise
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