Check out 701s shifting tranny..

[Andy Baker]

Salik,

This is a good start of a design. As I have said before, it takes guts to put your design on here to be critiqued, as you will get some constructive criticism in this thread.

Like Bill, I like your use of 1/8" thick walls. I like your angle too, as it makes the gearbox easy to mount. Your gear reduction between the F-P motor and the CIM motor is a good idea also, but it needs to be implemented better. You dog pockets on your 2 gears are good, but you will need a CNC mill to implement this shifting technique.

Here is a short list of improvements that you may want to implement. Please don't take this has harsh criticism, as I am only trying to help.

1. Getting wires to the F-P motor will be difficult. If you shorten the angle bracket on the right and give clearance around the F-P motor, your wiring will be easier. Also, once you shorten that bracket, you can bring the two brackets together and reduce the width of your gearbox.

2. As said above, you need to mount the CIM motor in a different way. This mounting will be difficult with the F-P gear and the CIM gear the way they are.

3. Can you choose a smaller F-P gear? That will allow you to omit that little sup-plate that you used to mount the F-P motor. You would need a small enough gear that allows you to access the 2 mounting holes for the F-P motor.

4. The cylinder standoff for the dog shifter will work well with only 2 posts. You have 3, and that will work, but it is a bit of overkill.

5. The dog shifter gear can be shortened. However, yours will work fine. It is good to have dog teeth that are too long as opposed to too short. If you are trying to reduce the width of your gearbox, this is an area make smaller, but it is not necessary.

6. The two gears, inside the gearbox, on your CIM motor shaft need to have a wider face width. It looks like they are currently 1/4" wide. They really need to be 3/8" wide, in my opinion. This way, you will get the full mesh onto your bigger gears.

Like I said above, this is a good start. I commend you on posting your design.

Sincerely,
Andy B.