Motorcycle Front Fork Spring Leg Sub-Tank Air Chamber
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Solution Overview
Problem
The existing spring leg for motorcycle front forks with air springs lacks sufficient capacity in the rebound air spring chamber, leading to instability in rebound reaction force near full extension, which affects steering stability.
Innovation Solution
Incorporating a sub-tank with an air chamber that communicates with the rebound air spring chamber, expanding its capacity and reducing the compression ratio, thereby stabilizing the rebound reaction force and improving steering stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rebound air spring chamber is configured by the limited section between the rod guide and the guide of the guide rod, then the structure is simple, but the capacity is insufficient and the rebound reaction force becomes unstable
Solution Approach 1:
The rebound air spring chamber is divided into two independent parts: the original chamber formed between the rod guide and the guide of the guide rod, and an additional sub-tank chamber. These two chambers work together to provide sufficient total capacity while maintaining the original simple structural configuration.
Solution Approach 2:
The sub-tank is connected to the original rebound air spring chamber through a communication passage, merging the air spaces of both chambers into a single functional unit. This combination increases the total capacity without requiring complete redesign of the existing structure.
2Volume of stationary object
If the rebound air spring chamber has limited capacity, then the structure remains compact, but the compression ratio becomes high and steering stability deteriorates
Solution Approach 1:
Instead of expanding the rebound air spring chamber in the vertical direction within the limited space between the rod guide and the guide, the solution adds a sub-tank as an additional dimension of air storage. This increases capacity without increasing the compression ratio of the original chamber.
3Reliability
If a sub-tank is added to expand the rebound air spring chamber capacity, then the rebound reaction force stability improves, but the device complexity increases
Solution Approach 1:
The sub-tank is designed to be integrated with existing components of the front fork assembly, utilizing available space and connecting through existing structural elements. This self-integrating approach minimizes the increase in overall device complexity while achieving the desired capacity expansion.
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 expanded capacity of the rebound air spring chamber ensures a stable rebound reaction force, enhancing steering stability by increasing the spring force in the latter half of the compression stroke without affecting initial to intermediate regions.
Implementation Method 1
a rebound air spring chamber formed between a rod guide, which is provided in the guide cylinder and in which the guide rod is inserted and supported, and the guide of the guide rod inserted into the guide cylinder inside of the guide cylinder
Data Source
AI summary
In a spring leg of a front fork, the capacity of a rebound air spring chamber is expanded and a stable rebound reaction force is ensured, and the spring leg of the front fork is provided with a sub-tank including an air chamber communicating with a rebound air spring chamber.