ENGINEERING
Assembly of pre-estimated parts and devices to ensure the functionality and application of this project, also the safety would always come first under our conditions.
SYSTEMATIC.
The entire project can be divided into three branches by their characteristic, and any further inspection or improvement can be taken easily on each region.
Designed parts
All parameters including the maximum speed, friction and gear wear out had been calculated in order to maintain the safety under reasonable circumstance.
STEP 0
For the initial bicycle from customer, identify the location of the gear that is not driven by the rider chain. Remove all the dust and anything possible to interrupt the motion.
STEP 1-1
Attach the “STAND (B-2)” and STAND-ARMs to the bike seat rod to achieve stability. Be sure there is enough room for battery and wires between motor poles, rear wheel, and the throttle.
STEP 1-2
Place the MY1016 motor and bolt in with four #8 steel metal screws to the STAND, the holes drilled on the STAND need to be accurate and leave the room for chain and bike gear.
STEP 2
Align the sprocket and bike gear vertically, here is somehow the troubles come in and more machine works needed. Drilling multiple holes on the STAND first and find which ones are perfectly align would be a suggested order instead of manufacturing steps on others.
STEP 3
After the #40 roller chain is properly wounded on the two gears (red and yellow in the picture), wire up the battery and rocker switch with the order of battery, switch then motor from positive pole to negative. A MASTERLINK is recommended to facilitate placement of chain.
mASTER LINK NOTICES
There are some commercial master-link tools to assemble or disassemble. But another easy and quick way to do it would be using the GRIPPING PLIERS onto the retaining clip and link edge. It took about an average of 40 seconds to finish it but usually 3 minutes without the suitable tools.
Manufacturing issues - Even though a prototype was made with desired motor, chain drive and battery, and is capable to assist bicycling, geometry measurements of another bicycle were needed to be taken to pursue a high usability of this project for various bike model. Determine few junction points of this device that are able to adjust in the case of bigger bike. Finding similarities of several bike frame to match the installation location of this device for purpose of high applicability. Rocker switch on throttle facilitates operation as users’ wish by one thumb needed. Wire and Zip-ties the switch or other means to make full stop when brake engaged. Multiple hole punched on steel platform so it suits more than just one size of bike; elongate the space between motor and bike by replacing a spring. Try to make the whole installation process within 15 mins to compete with the marketing products. With other factors remain constant, seek solutions to make the bike speed as design function; 7-9 miles per hour.Another issue was found about the motor trembling when circuit is on, so a drake alternator bracket is recommended to pursue stability and still enable the additional chain tied for needs to support approximate 25 lbs. of motor vertical weight. The DC voltage impulsive device from battery to motor is still under developed to achieve the purpose of hybrid because the whole energy pushing forward was generated by the battery not from pedaling. Since the additional part was chosen, the orientation must be changed to fit time to time as well as methods changed in proposal.