Straddle-Type Vehicle Front Suspension Damping
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Solution Overview
Problem
Straddle-type vehicles experience deterioration in travel feel due to vibrations in the left and right front wheels that cannot be effectively damped by existing suspension systems, particularly during leaning and turning, leading to adverse tire behavior on the road surface.
Innovation Solution
A straddle-type vehicle is equipped with a link mechanism connecting the front wheels to the body frame, featuring a shock absorber for damping vibrations in the same phase and a damper capable of damping vibrations in opposite phases, with the damper's damping force increasing at higher frequencies to address the specific vibrations that shock absorbers cannot handle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shock absorber is used to damp vibrations in the front wheels, then vibrations in the same phase are damped, but vibrations in opposite phases cannot be effectively damped
Solution Approach 1:
The vibration damping function is segmented into two independent systems: a shock absorber for same-phase vibrations and a damper for opposite-phase vibrations. This segmentation allows each component to be optimized for its specific vibration mode, resolving the limitation where a single shock absorber cannot handle both vibration types effectively.
Solution Approach 2:
The damping system achieves multi-functionality by combining two dampers with different characteristics. The first damper (shock absorber) handles same-phase vibrations while the second damper handles opposite-phase vibrations, creating a universal damping system that addresses all vibration modes occurring in the front wheels.
2Reliability
If the damping force of the damper is increased to damp high-frequency vibrations, then travel feel deteriorates, but if reduced, then vibrations in opposite phases are not effectively damped
Solution Approach 1:
Different damping characteristics are assigned to different vibration modes: the shock absorber provides strong damping for same-phase vibrations, while the damper provides frequency-dependent damping for opposite-phase vibrations. This local quality differentiation allows effective vibration damping without compromising travel feel across different operating conditions.
Solution Approach 2:
The damper's damping force is made dynamic and frequency-dependent, increasing at high frequencies to damp vibrations effectively while maintaining lower damping at low frequencies to preserve natural vehicle behavior and travel feel. This dynamic adjustment resolves the contradiction between damping effectiveness and ride comfort.
3Reliability
If a damper is added to damp vibrations in opposite phases, then vibration damping is improved, but device complexity increases
Solution Approach 1:
The shock absorber and damper are merged into an integrated damping system where both components work together to handle different vibration modes. This combination achieves comprehensive vibration damping while sharing common mounting structures and control mechanisms, minimizing the increase in overall system complexity.
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 solution effectively dampens vibrations in opposite phases, preventing tire hopping and improving the travel feel without impeding the vehicle's leaning, by configuring the damper to provide optimal damping properties across various frequencies and positions.
Implementation Method 1
a shock absorber capable of damping vibrations in the same phase occurring in the left and right front wheels
Implementation Method 2
a damper capable of damping vibrations in opposite phases occurring in the left and right front wheels. The damper is configured such that its damping force increases at least in a certain frequency range as the frequency of the vibrations in the opposite phases increases
Data Source
Figure 1
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AI summary
A three-wheeled vehicle (1) includes: a body frame; left and right front wheels (3); a link mechanism (30) configured to connect the left and right front wheels (3) with the body frame; a shock absorber (40) capable of damping vibrations in the same phase occurring in the left and right front wheels (3); and a damper (50) capable of damping vibrations in opposite phases occurring in the left and right front wheels (3) wherein the damper (50) is configured such that its damping force increases at least in a certain frequency range as the frequency of the vibrations in the opposite phases increases.