Centrelock Wheel Nut Ratchet Locking Against Brake Loosening
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Solution Overview
Problem
Centrelock wheels in motorsport applications are prone to nut loosening during braking, leading to potential wheel detachment and increased hub fatigue, requiring frequent inspections and maintenance.
Innovation Solution
A wheel fastening system with a pawl and ratchet mechanism on the hub and nut to prevent loosening by allowing rotation in one direction while blocking it in the opposite direction, using pawls to engage with a ratchet for secure fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a centrelock wheel system is used to enable rapid wheel removal and improve handling, then wheel fastening speed and handling performance are improved, but the nut is prone to loosening during braking
Solution Approach 1:
A pawl-ratchet mechanism is introduced as an intermediary component between the nut and hub. The pawl engages with the ratchet teeth to prevent the nut from rotating in the loosening direction while allowing tightening rotation, thereby mediating the conflicting requirements of rapid fastening and loosening prevention
Solution Approach 2:
The loosening prevention function is extracted from the traditional pin retention system and implemented through a dedicated pawl-ratchet mechanism. This separate mechanism specifically addresses the loosening problem without interfering with the rapid fastening capability of the centrelock system
2Loss of time
If conventional centrelock systems are used, then wheel removal is rapid, but frequent inspections and maintenance are required due to nut loosening
Solution Approach 1:
The pawl-ratchet mechanism provides preliminary action by preventing nut loosening before it can occur during braking operations. This proactive approach eliminates the need for reactive inspections and maintenance, reducing time loss while improving fastening stability
3Object-affected harmful factors
If a pin retention mechanism is used to prevent detachment, then wheel detachment is prevented, but nut loosening and hub fatigue are not addressed
Solution Approach 1:
Instead of allowing loosening and then preventing detachment (pin approach), the invention inverts the approach by preventing loosening in the first place through the pawl-ratchet mechanism. This eliminates the harmful effects of nut loosening and associated hub fatigue while maintaining detachment prevention
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents nut loosening, reducing the need for frequent inspections, enhancing vehicle safety and handling, and minimizing hub fatigue and damage.
Implementation Method 1
a pawl and ratchet mechanism arranged on the hub and nut to prevent loosening by allowing rotation in one direction while blocking it in the opposite direction
Data Source
AI summary
A wheel fastening system for a vehicle is disclosed. In an embodiment, a hub for mounting a wheel includes a threaded surface and a nut which is engageable with the threaded surface to fasten the wheel to the hub. When the nut is engaged with the threaded surface, rotation of the nut in a first direction about an axis of the hub results in tightening of the nut on the hub. A pawl assembly on one or more pawls and a ratchet which are arranged so that, when the nut is engaged with the threaded surface, each of the pawls engages with the ratchet to thereby allow rotation of the nut about the axis in the first direction and block rotation of the nut about the axis in a second, opposite direction. In this manner, unwanted loosening of the nut on the hub may be prevented.