New Project " help Please" Honda st1300 Conversion

[tylerwatts]

Hi Tony
There's an opportunity to have more space by mounting the motor below and behind the shaft output with a simple belt reduction between them. Really simple setup that can be part of the battery mount cage and save weight and cost also. Just food for thought that this wouldn't cost a lot and the benefit of not using the gearbox is significant. You don't need it in an ev!

Additionally, you'd have space for more batteries in future meaning you could turn up your Sevcon to get some more performance and spice it up some. I can sketch my solution out for you if you are interested but I don't want to pressure you, just make sure you are informed. I've planned this same conversion style on a BMW K series for a while, not had funds to do it though.


Cheers
Tyler

 

[technotony007]

Hi Tony
There's an opportunity to have more space by mounting the motor below and behind the shaft output with a simple belt reduction between them. Really simple setup that can be part of the battery mount cage and save weight and cost also. Just food for thought that this wouldn't cost a lot and the benefit of not using the gearbox is significant. You don't need it in an ev!

Additionally, you'd have space for more batteries in future meaning you could turn up your Sevcon to get some more performance and spice it up some. I can sketch my solution out for you if you are interested but I don't want to pressure you, just make sure you are informed. I've planned this same conversion style on a BMW K series for a while, not had funds to do it though.


Cheers
Tyler

Hi Tyler ,
Obviously you have see my photos of the setup , I would be interested to see exactly what you mean in a sketch?

regards

tony

 

[tylerwatts]

Hi Tony
I'm sorry I've taken so long to respond, and my sketching is rubbish tonight, but here's the idea.
Use a flat mount bearing mounted to a plate perpendicular to the drive shaft uj. Mount uj (or adapter shaft to uj) through bearing and mount pulley to other side.
I'd use something off the shelf like industrial belt drive or Harley style primary drive belt to mate to the motor.
Then motor mounts to same plate behind and beneath the swingarm making space for batteries etc.
Rest of battery box integrates with the plate so the whole assembly mounts as 1 to suit the bike. I always like to keep OEM structures unmodified, except trimming a few bits if they don't serve any purpose.

I'm not overly knowledgeable about st1300 layouts so not sure how it would fit but it works on the BMW in principle.

Hope that makes sense and helps.

Cheers
Tyler

 

[technotony007]

Hi Tony
I'm sorry I've taken so long to respond, and my sketching is rubbish tonight, but here's the idea.
Use a flat mount bearing mounted to a plate perpendicular to the drive shaft uj. Mount uj (or adapter shaft to uj) through bearing and mount pulley to other side.
I'd use something off the shelf like industrial belt drive or Harley style primary drive belt to mate to the motor.
Then motor mounts to same plate behind and beneath the swingarm making space for batteries etc.
Rest of battery box integrates with the plate so the whole assembly mounts as 1 to suit the bike. I always like to keep OEM structures unmodified, except trimming a few bits if they don't serve any purpose.

I'm not overly knowledgeable about st1300 layouts so not sure how it would fit but it works on the BMW in principle.

Hope that makes sense and helps.

Cheers
Tyler

Hi Tyler,
appreciate your thoughts and sketch on this , which explains the theory very well. I have considered this type assembly of assembly before , but with the options chain and spocket, and meshed gears.

the stumbling blocks in my mind , although i have not ruled them out are :

1. cost of these specialist assemblies. ( probably around £500 to £1500 )
2. the % losses in torque , compared with a direct coupled drive.
3. extra moving parts for potential failures.

Your method is vaild , and something i may need to look at , should my direct motor to shaft coupling be a failure...

thanks again Tyler , it definately would be something to consider , and could be configured to give and higher RPM with ratios. ( which would be better.)

regards

tony

 

[tylerwatts]

Hi Tony.
No problem. This would give you more torque because the gearing is a multiplier. So if your ratio is 1.5 motor turns to 1 shaft turn, you get 1.5x the torque at the wheels. So better acceleration, climbing power etc. More likely to sustain motorway speeds as the power needed above 60 will be more than your setup wants to provide continuously I suspect.

But no harm upgrading later, I think it'll be very good as you plan to build it be you're components are spec'd higher so should be fine.good luck.

Cheers
Tyler