Moments at contact tyre patch and wheel spindle

Click For Summary
SUMMARY

The discussion focuses on calculating the moments or torque at the contact patch (point A) and the hub center (point B) of a bicycle wheel while cornering. Key parameters include the force through the suspension (Fsr), lateral cornering force (Fc), lean angle (phi), mass and gravity (MG), and the cross-sectional radius of the tire (t). The user has already calculated these parameters using various equations related to wheelbase, velocity, friction, and turn radius, but seeks confirmation on their relevance and any simpler methods for calculation. The context assumes a 2D diagram and stationary bike conditions for analysis.

PREREQUISITES
  • Understanding of basic physics principles related to torque and moments
  • Familiarity with bicycle dynamics and cornering forces
  • Knowledge of static equilibrium in mechanical systems
  • Ability to interpret and analyze 2D diagrams of forces
NEXT STEPS
  • Research "Bicycle dynamics and cornering physics" for deeper insights into forces at play
  • Study "Torque calculations in mechanical systems" to refine understanding of moments
  • Explore "Static equilibrium analysis" to apply principles to stationary conditions
  • Investigate "Force analysis in 2D systems" for practical applications in similar scenarios
USEFUL FOR

Mechanical engineers, bicycle designers, physics students, and anyone interested in understanding the forces acting on bicycles during cornering maneuvers.

shott92
Messages
29
Reaction score
0
hi guys this is an image of the rear wheel of a push bike going into a corner as well as what i think are relevant forces,
i need to calculate the moments or torque at A (the contact patch) and B (the hub centre)
this is to calculate the force on the left hand side of the frame and right hand side of the frame while in a corner
Fsr = the force going through the suspension
Fc = lateral cornering forcer on the rear wheel
phi = lean angle
MG = mass & gravity
t = the cross sectional radius of the tyre

i can and have calculated the above parameters through lot of prior equations that take into account the wheelbase, velocity, friction, radius of the turn ect. but i think that the above are the require ones to calculate this... if there is an easier way please let me know

im sure its quite simple really but i have either over thought it are just been daft

cheers for any help guys but could you please explain your reasoning behind your answer so that i can verify it please

https://s.yimg.com/hd/answers/i/7c911b9cff554eabad1ca29c0f9e8161_A.jpeg?a=answers&mr=0&x=1398489477&
 
Last edited by a moderator:
Engineering news on Phys.org
Your link is not visible. Site claims "Unauthorized".
 
the above link as an attachment

sorry the above link doesn't work as i said thought I am not 100% these are the relevant forces but i am fairly confident also tho point out this is assuming that it is a 2d diagram should be a simple moments equation really (i think) also it can be assumed the bike is stationary and that it is simple leant over with a machine applying the forces if it makes it easier to calculate...
thats the torque or moments about point A ( contact patch ) and B the wheel spindle centre
but any help would be great whether in motion stationary or anything, if you ignore the forces i have written and know another way very happy to listen to that too thanks a lot guys cheers
 

Attachments

  • pic of cornering diagram.jpeg
    pic of cornering diagram.jpeg
    12.3 KB · Views: 611

Similar threads

  • · Replies 9 ·
Replies
9
Views
8K
  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 2 ·
Replies
2
Views
5K
Replies
33
Views
6K
  • · Replies 4 ·
Replies
4
Views
11K
  • · Replies 16 ·
Replies
16
Views
3K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 2 ·
Replies
2
Views
5K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 6 ·
Replies
6
Views
8K