Motorcycle Front Fork Rolling Guide Mechanism for Friction Reduction
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Solution Overview
Problem
Existing motorcycle forks experience seizure due to radial or lateral thrusts during continuous braking, leading to increased sliding friction, loss of traction, and vibrations, which negatively impact performance and safety, especially during racing.
Innovation Solution
The implementation of rolling guide and support means between the stem and sheath of the fork, made from high-hardness metallic materials, eliminates the need for lubrication and reduces friction, thereby enhancing stability and traction while minimizing vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sliding guide and support means are used between stem and sheath, then the fork structure is simple and easy to manufacture, but the guide and support means are subject to seizure due to sliding friction under radial or lateral thrusts during continuous braking
Solution Approach 1:
The patent replaces the sliding friction mechanism with a rolling friction mechanism by introducing rolling elements (balls or rollers) between the guide and support means. This substitution transforms the mechanical interaction from sliding contact to rolling contact, dramatically reducing friction and preventing seizure under radial or lateral thrusts during continuous braking operations.
Solution Approach 2:
The patent changes the friction parameter by transitioning from sliding friction to rolling friction. This parameter change fundamentally alters the friction characteristics, reducing the coefficient of friction and enabling the guide and support means to withstand continuous braking forces without seizure.
2Stability of the object's composition
If clearance is provided between sheath and guide and support means to accommodate deformation, then the fork can tolerate mechanical deformations, but vibrations are transmitted to the frame during operation
Solution Approach 1:
The patent introduces rolling elements as intermediary components between the guide and support means. These rolling elements act as mediators that maintain stable contact while accommodating minor deformations, and simultaneously dampen vibrations before they can be transmitted to the frame, thus resolving both the deformation tolerance and vibration transmission issues.
3Reliability
If lubricating oil is used to reduce friction between surfaces, then sliding friction is reduced, but the fork requires continuous lubrication maintenance and lubrication oil can leak
Solution Approach 1:
The patent eliminates the need for lubricating oil by replacing the sliding friction system with a rolling friction system. The rolling elements inherently reduce friction through their rolling motion, removing the dependency on lubrication and the associated complexity of lubrication delivery systems, seals, and maintenance procedures.
Solution Approach 2:
The rolling elements provide self-lubricating characteristics through their rolling motion, which naturally minimizes friction without requiring external lubrication. The system becomes self-sufficient, eliminating the need for continuous lubrication maintenance and reducing the risk of oil leakage.
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
The improved fork maintains optimal performance under continuous stress for a longer duration, reduces vibrations, and ensures greater stability and traction during braking, allowing riders to operate at maximum performance and safety conditions.
Implementation Method 1
guide and support means include rolling means, as a whole numbered with 8, which cooperate by contact with the outer surface 6a of the stem of force 6 creating a rolling friction between the stem of force 6 and the guide and support means 7
Data Source
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AI summary
An improved fork (1), particularly for sport motorcycles, comprising a support group (2) suitable to be connected with the frame of the motorcycle, a pair of shock absorber arms (3, 4), which vary the position of the frame of the motorcycle in respect of the front wheel of the motorcycle itself as a result of the application of a load, each of which connected with the support group (2) and including an outer sheath (5) and a stem of force (6) slidingly and telescopically coupled one with each other, guide and support means (7), interposed between the outer sheath (5) and the stem of force (6) of the shock absorber arms (3, 4), which minimize friction between the stem of force (6) and the outer sheath (5). The guide and support means (7) include rolling means (8), which cooperate by contact with the outer surface (6a) of the stem of force (6) producing a rolling friction between the latter and the guide and support means (7).