The process of selecting an appropriate clutch arrangement for a dual drive set up will need to have taken into account relative shaft speeds during each condition, prime mover types, (e.g. electric/diesel) and whether it is acceptable to 'motor over' one of the drives when not required. Comparing the following features and drawbacks of each clutch type with the particular application will help establish a satisfactory set-up.
* whilst friction of component parts limits idling speed of many designs, alternatives are available with sprag elements which disengage (lift-off) or rollers which disengage hydro dynamically thereby allowing higher idling speeds
Clearly mistakes can be made in haste resulting in a transmission which may be more expensive than need be, give too short a service life or will not work at all! One such case where our customer was adamant that freewheeling clutches would do the job for the reversible conveyor (see 'reversible drive' diagram above) resulted in a bottle of whisky over the difference of opinion - Cheers!