Front Wheel Suspension for Two-Wheel Drive Motorcycles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Two-wheel drive motorcycles lack effective shock absorption for the front wheel, leading to premature damage and reduced traction when encountering rough terrain, as traditional designs cannot maintain sprocket-to-sprocket distance for chain drive systems without compromising chain tension.
Innovation Solution
A front wheel shock absorbing suspension system using a U-shaped swing arm connected to the front wheel axle, with a shock absorber between the steering fork and swing arm, allowing the front wheel axle to pivot and absorb shocks while maintaining fixed sprocket distances for the chain drive, enhancing traction and protecting the drive mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shock absorbers are installed within the front steering fork, then shock absorption capability is improved, but the sprocket-to-sprocket distance for the front wheel chain drive must vary, compromising chain tension
Solution Approach 1:
The system separates the shock absorption function from the steering fork by introducing a swing arm as an independent component. The swing arm absorbs shocks while the steering fork maintains steering function, preventing interference with chain drive geometry and tension stability.
Solution Approach 2:
The swing arm acts as an intermediary between the front wheel and the steering fork. It absorbs shock impacts before they reach the steering fork and chain drive system, protecting the chain tension from variation while still allowing necessary motion for shock absorption.
2Strength
If the front wheel is designed to handle large shock forces, then durability is improved, but the system complexity and weight increase
Solution Approach 1:
The shock absorption function is extracted from the front wheel assembly and implemented as a separate swing arm mechanism. This allows the front wheel to be optimized for its primary function while the swing arm handles shock absorption, reducing overall system complexity compared to reinforcing the entire front wheel assembly for shock resistance.
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 system effectively absorbs shocks, reduces the risk of premature damage to the front wheel drive system, and improves traction on rough terrain, enabling more aggressive driving without excessive shock or traction loss.
Implementation Method 1
A shock absorber is connected to and extends between a location on the steering fork and a location on the swing arm
Implementation Method 2
The shock absorber preferably includes a dampening element and a compressed spring element
Implementation Method 3
The swing arm is able to pivot about the axle for a limited arc
Implementation Method 4
a sprocket for a chain 20 that drives a sprocket 24 secured to the rear wheel 22
Implementation Method 5
Chain 32 drives a sprocket 34 secured to the front wheel 36
Data Source
AI summary
A two-wheel drive motorcycle, or all wheel drive bicycle, has a spring loaded shock absorbing suspension and traction system for the front wheel. A swing arm, rather than the front steering fork, is mounted to the front wheel axle. A modified steering fork is mounted to the swing arm and a shock absorber extends between the front steering fork weldment and the swing arm. The shock absorber allows the front wheel axle to move upward relative to the front steering fork and motorcycle (or bicycle) in general to absorb upward shocks on the front wheel, and also pushes the wheel downward, thereby improving traction. The front chain drive includes two chains in series which are isolated from excessive shock forces.