SprocketsParameters
In order for the chain rotation 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 be the same as the pitch of the chain. Similarly, each sprocket tooth should be constructed so that it fits the sprocket. Also, the maximum width of the sprocket should be less than the clear distance between the internal chain link plates. If needed, a parameter can be set to add some clearance between the sprocket and the chain plate.
Some important parameters of sprockets include:
Pitch (p)
Number of teeth (N)
Chain wheel tooth width ratio (Wsp)
Roll diameter pitch ratio (Dr)
Ratio of bore diameter to pitch diameter (Dbr)
Ratio of hub diameter to pitch diameter (Dh)
Wheelbase width/pitch ratio on/under the wheel (whd)
2D and 3D models of sprockets with input parameters.
Sprockets are mainly determined by the pitch and the number of teeth. As shown in the figure below, you can build different shapes of sprockets by changing the combination of pitch and number of teeth.
Geometric model of three sprockets of the same size but with different numbers of teeth.
In order to be able to mount on the shaft, the default geometry of the sprocket contains a drill hole and hub on both the top and bottom side. As shown below, you can also choose to remove them from the geometry by setting the corresponding parameter values to zero.
Sprocket geometries with different optional features. Left: default sprocket geometry with hole and hub; Middle: sprocket geometry without hub at top and bottom; Right: sprocket geometry without hub hole.