Synchronous pulley

Timing belt wheel material: 500 ductile iron

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Synchronous pulley

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Synchronous pulley

Pitch tolerance of timing pulley (unit: mm)

Outer diameter	Allowable deviation
outside diameter pitch	tolerance
outside diameter pitch	Any two adjacent teeth any two adjacent teeth	90 ° arc inner approx.Tolerance
≤ 25.40	0.03	0.05
>25.4- 50.80	0.03	0.08
>50.80- 101.60	0.03	0.10
>101.60- 117.80	0.03	0.13
>117.80- 304.80	0.03	0.15
>304.80- 508.00	0.03	0.18
>508.00	0.03	0.20

Allowable runout of end face of synchronous pulley (unit: mm)

Pulley outside diameter	Allowable runout
outside diameter	allowable bounce
≤ 101.60	0.10
>101.60- 254.00	Pulley outside diameter× 0.001
>254.00	0.25 {(outside the pulleyDiameter-254.00)× 0.005}

Allowable radial runout of synchronous pulley (unit: mm)

Pulley outside diameter	Allowable runout
outside diameter	allowable bounce
≤ 203.20	0.13
>203.20	0.13 {(outside the pulleyDiameter-203.20)× 0.005}

Tolerance of outer diameter of synchronous belt pulley (unit: mm)

Pulley outside diameter	Deviation
outside diameter	tolerance
＜25.40	0.05 0
>25.40- 50.80	0.08 0
>50.80- 101.60	0.10 0
101.60- 117.80	0.13 0
117.80- 304.80	0.15 0
304.80- 508.00	0.18 0

P = pitch is the distance between two adjacent teeth measured on the center pitch line of the pulley or synchronous belt Z = number of teeth on the pulley
Dp: The diameter of the pitch circle of the pulley, which can be deduced from the following formula
De = actual outer circle diameter of pulley
Dm = diameter of pulley shoulder
D = diameter of inner hole of pulley
w = width of pulley teeth
L = Overall pulley width (including shoulder length)
Timing pulley material: steel, casting, aluminum

Synchronous belt wheel basic structure model