For the chain turning system to work properly, the sprocket and chain should be compatible with each other.To ensure this, the distance between the centers of adjacent teeth of the sprocket should match the pitch of the chain.Similarly, each sprocket should be constructed to fit the sprocket.Also, the maximum width of the sprocket should be less than the clear distance between the inner link plates.If desired, a parameter can be set to add some clearance between the sprocket and the chain plate.
Some important parameters of sprockets include:
Number of teeth (N)
Sprocket width ratio (Wsp)
Roller pitch ratio (Dr)
Aperture diameter to pitch diameter ratio (Dbr)
Ratio of hub diameter to pitch diameter (Dh)
Wheel track width/pitch ratio over/under (Whd) of the hub
2D and 3D models of sprockets with input parameters.
The sprocket is mainly determined by the pitch and the number of teeth.As shown in the image below, you can build sprockets of different shapes by changing the combination of pitch and number of teeth.
Three sprocket geometries of the same size but different numbers of teeth.
The default geometry of the sprocket includes a drilled hole and hub on both the top and bottom sides in order to be able to mount on the axle.As shown in the image below, you can also choose to set the corresponding parameter values to zero to remove them from the geometry.
Sprocket geometry with different optional features.Left: default sprocket geometry with holes and hub; middle: sprocket geometry without hub at top and bottom; right: sprocket geometry without hub holes.