Disk Brake Connections: Finding Torque & Bolt Amounts

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SUMMARY

This discussion focuses on calculating the torque and bolt quantities required for connecting a disk brake to a shoulder using self-locking screws. Key steps include calculating the necessary force to prevent slipping based on external loads, determining the normal force using static friction, and selecting bolts that can handle approximately 60% of their ultimate strength. For instance, if a required force of 10kN is identified, one could opt for four bolts rated at 4.5kN or five bolts rated at 5.3kN. Finally, the torque specification should be calculated to ensure it meets around 60% of the bolts' rated strength.

PREREQUISITES
  • Understanding of static friction principles
  • Knowledge of bolt strength ratings and material properties
  • Familiarity with force and moment calculations in mechanical systems
  • Experience with torque specifications and their applications
NEXT STEPS
  • Research "Calculating Normal Force in Mechanical Joints"
  • Learn about "Bolt Pattern Design for Load Distribution"
  • Study "Torque Specifications for Fasteners in Automotive Applications"
  • Explore "Static Friction Coefficients for Different Materials"
USEFUL FOR

Mechanical engineers, automotive designers, and anyone involved in the design and assembly of disk brake systems will benefit from this discussion.

mechk
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I'm trying to connect a disk from a brake to a shoulder using self locking screws but can't find a formula that would help me to calculate the torque these screws would be subjected to or how many bolts I would need. What do I need to do?
 
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Basic steps are as follows:

  1. You have to first calculate the force you'll need at the interface to prevent slipping. This will be dependent on your external loads (forces and moments).
  2. Using this force and static friction between the two parts, you can can calculate how much normal force will be required to prevent the joint from slipping.
  3. Based on the normal force, choose a set of bolts that can take it. Design the bolt pattern such that you're only utilizing about 60% of their ultimate strength. For example if the required force is 10kN, you could choose 4 bolts rated at about 4.5kN or 5 bolts rated for 5.3kN. It will depend on your geometry and whatever other requirements you have.
  4. Once you've chosen the bolts, you can calculate the torque spec to meet about 60% of their rated strength.
  5. Profit!

Is this a disk brake in an automotive application?
 

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