- #1
Heral89
- 21
- 2
Hi
I am new to this forum and I was referred to it by a friend.
I am building an electric scooter and want to know how to add suspension/shock absorbers to it.
I know the terrain I want to go over. Bumps of about 1-2 inch. My wheel size will be pretty small about 7-8 inches. I was looking to buy online small shocks for pockets bikes or mini scooters. What I couldn't figure out was the spring stiffness or spring rate to choose.
Weight of the scooter with me would be around 130 to 150 kg. Say it is equally divided for both front and back. So front shocks have to take about 65 to 75 kg of static load. Assuming I use only 1 shock in front, it should be able to take 75 kg of static load plus force due to bumps. Bumps would cause displacement of 1 inch . Force will be 75kgf plus (spring stiffness x bump height/depth). What should be the stroke length? 1 inch for the bump plus deflection due to static weight (spring stiffness x 75kgf) plus a clearance.
It all comes down to what should be spring stiffness or spring rate?
I am not even considering effects damping. Any idea how I should approach this problem. Is there an online calculator or a design guide book (couldn't find one) for free or nominal charge. What should be the extra clearance I should have so that I know my full stroke length. Please guide me for the same.
Thanks
I am new to this forum and I was referred to it by a friend.
I am building an electric scooter and want to know how to add suspension/shock absorbers to it.
I know the terrain I want to go over. Bumps of about 1-2 inch. My wheel size will be pretty small about 7-8 inches. I was looking to buy online small shocks for pockets bikes or mini scooters. What I couldn't figure out was the spring stiffness or spring rate to choose.
Weight of the scooter with me would be around 130 to 150 kg. Say it is equally divided for both front and back. So front shocks have to take about 65 to 75 kg of static load. Assuming I use only 1 shock in front, it should be able to take 75 kg of static load plus force due to bumps. Bumps would cause displacement of 1 inch . Force will be 75kgf plus (spring stiffness x bump height/depth). What should be the stroke length? 1 inch for the bump plus deflection due to static weight (spring stiffness x 75kgf) plus a clearance.
It all comes down to what should be spring stiffness or spring rate?
I am not even considering effects damping. Any idea how I should approach this problem. Is there an online calculator or a design guide book (couldn't find one) for free or nominal charge. What should be the extra clearance I should have so that I know my full stroke length. Please guide me for the same.
Thanks