Roller Chain Drive Design - Cross+Morse

CROSS+MORSER oller Chain by nature of its Design is capable of transmittinghigh torque loads, and provides the ideal Drive media for theconnection of slow to medium speed shafts located on extendedcentres. The selection and application is reasonably simple byfollowing normal engineering practices, but there are points ofgood Design practice specific to Roller Chain Drives, andconsideration of these will ensure successful Drive Design . Numbers of Teeth in SprocketsChordal Action:- As a Chain engages and disengages with asprocket there is a rise and fall of each link, and a velocityvariation. These are due to chordal action caused by thechain forming a polygon on the sprocket . In the diagramsbelow as Roller B approaches the sprocket it follows thechordal line of Roller A. Once engaged it is caused to risefollowing the arc of the pitch circle. As the Chain unwrapsfrom the sprocket the reverse occurs. As well as inducing avibration into the Chain , the linear velocity of the Chain isvaried from a minimum on effective radius d to a maximumon the pitch circle radius r.

be supported on plastic chain guide to maintain constant contact with sprockets, alternatively where rollers are well spaced idler sprockets can be positioned opposite between each pair of sprockets, this increasing the angle of contact on the driven sprockets. The small contact between driven sprocket and chain requires that torque on any one ...

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  Guide, Chain, Roller, Sprocket, Roller chain, Chain guide, Sprocket and chain

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