Coil Spring Lateral Force Reduction via Effective Turn Optimization
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Solution Overview
Problem
Existing vehicle-mounted apparatuses with coil spring biasing structures face instability due to excessive lateral force applied to valve bodies, leading to operational issues and noise generation.
Innovation Solution
The coil spring is configured to satisfy specific equations regarding the number of effective turns in compressed and natural states, reducing lateral force by designing it with a non-linear deformation characteristic and barrel-shaped configuration, ensuring the number of effective turns in the compressed state closely approaches an integer value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the coil spring is designed with conventional parameters, then the biasing force is sufficient, but the lateral force applied to the valve body becomes excessive causing instability
Solution Approach 1:
The patent applies parameter changes by optimizing the number of effective turns of the coil spring to satisfy specific mathematical relationships (Equations 1-4). By adjusting N1, n1, N0, and n0 to meet these equations, the spring constant and lateral force characteristics are modified to reduce lateral force on the valve body while maintaining sufficient biasing force, thus resolving the contradiction between force magnitude and stability.
2Force
If the coil spring applies greater lateral force, then the biasing effect is stronger, but operational stability deteriorates and noise increases
Solution Approach 1:
The patent uses parameter changes by establishing specific mathematical relationships for the number of effective turns (Equations 1-4). These parameter constraints ensure that the coil spring produces the desired biasing effect while limiting lateral force components that cause instability and noise, thereby improving operational reliability.
3Device complexity
If the number of effective turns is not optimized, then the spring design is simpler, but lateral force reduction is not achieved
Solution Approach 1:
The patent addresses this contradiction by defining specific parameter ranges and mathematical relationships (Equations 1-4) for the number of effective turns. These equations provide clear design guidelines that balance complexity reduction with lateral force reduction, allowing engineers to achieve optimal performance through calculated parameter selection rather than trial and error.
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
This configuration reduces the lateral force applied to biasing target members, enhancing operational stability and preventing noise generation by maintaining a stable valve-opened state and minimizing vibration.
Implementation Method 1
the coil spring set in the containing portion in a compressed state and configured to bias a biasing target member
Data Source
AI summary
The present invention is to provide a vehicle-mounted apparatus having a biasing structure using a coil spring capable of reducing a lateral force of a coil spring that is applied to a biasing target member. When N1, n1, N0, and n0 represent the number of effective turns when the relief valve spring 37 is set in a valve hole 34 of a spool 29 in a compressed state, a value of an integer of N1, the number of effective turns when a length of the relief valve spring 37 is a natural length, and a value of an integer of N0, respectively, the spring 37 satisfies an equation 1: 0≤N1−n1≤0.25 or an equation 2: 0.75≤N1−n1<1.