Human Electric Trike Thesis

Design of an electrically assisted human powered trike

Archive for September 25th, 2006

Gearing calculations

Posted by Bob Dold on Monday, September 25, 2006 11:50 PM

A spreadsheet was constructed to calculate the optimum gearing for the trike, by using a 14 tooth sprocket on the scooter gearbox and a 34 tooth cog on a mid drive, the motor can be geared down enough to allow the motor to make it up a 10% grade.

The picture below illustrates the chain drive layout:

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Suspension motion analysis

Posted by Bob Dold on Monday, September 25, 2006 10:20 PM

Created a motion model using CosmosMotion software to predict loading on shocks throught the suspension travel. The plot below shows the loading on the front shock vs. the shock travel, the nominal shock position is at .5 inches.

The plot below is the loading on the rear shock from the swingarm:

In both cases the load increases near the end of the travel due to the mechanical advantage of the linkage. The applied wheel load is 1G in the vertical direction.

Link to rear suspention AVI: rear_arm.avi (9Mb)

Link to front suspension AVI: front_susp.avi (8Mb)

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