Motor and Gearing Type for High Torque Cam Application
Motor and Gearing Type for High Torque Cam Application
(OP)
I am currently undertaking a project to upgrade a fork lift. The requested task is to change the hydraulic tilt mechanism used to tilt the fork lift to an electrically powered system that enables precise position control.
So far I have narrowed a solution down to using some form of electric motor (to be defined) with a CAM shaft. The required movement is to tilt the fork carriage from -2degrees to +2degrees and output position.
The system is configured with the carriage hung from a pivot, the current hydraulic system pushes the carriage at a vertical position 270mm below this pivot and the worst case scenario for loading is a load of 2666 Kg loaded on the forks at a horizontal position of 1270mm from the pivot.
I have calculated that the moment about the pivot due to the load applied to be 33140 Nm and therefore the force pushing horizontally from the current hydraulic system, and therefore required by the new electrical system, to be 132031.9 N
Could anyone suggest how to go about sizing a suitable motor and gearing system for this application and if it is feasible to use a cam to move the carriage?
The alternative to a cam is to use a dog bone rod to connect the carriage to the shaft and have the shaft only rotate by 90degrees in order to achieve the motion.
Thanks





RE: Motor and Gearing Type for High Torque Cam Application
Cams are tricky because of the input torque, the radial load, the point load at the follower surface, the lateral reactions on the follower, and all the other maddening details that must be considered. Most engineers don't design cams often enough to remember all that stuff, so chances are you'll get to do it over at least once.
Mike Halloran
Pembroke Pines, FL, USA
RE: Motor and Gearing Type for High Torque Cam Application
Post a link to this thread in the Fluid Power forum:
http://www.eng-tips.com/threadminder.cfm?pid=1083
Peter Nachtwey will hopefully comment with some helpful suggestions.
-SceneryDriver
RE: Motor and Gearing Type for High Torque Cam Application
RE: Motor and Gearing Type for High Torque Cam Application
You need to figure out how you are going to keep it stationary without constantly driving the motor at 0 speed to hold it stationary.
Why not investigate better hydraulic controls?
RE: Motor and Gearing Type for High Torque Cam Application