Shock Absorber Partition Structure for Frequency-Sensitive Flow
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Solution Overview
Problem
In shock absorbers with a partition member on the cylinder's bottom side, there is a likelihood that the flow path area for introducing working fluid into the frequency sensitive part cannot be secured, leading to potential performance issues, especially in variable flow rate types where the frequency sensitive mechanism's effectiveness is compromised.
Innovation Solution
A shock absorber design with a partition member that includes a first flow path allowing communication between the cylinder and reservoir chambers, with the frequency sensitive part located on the bottom side of the partition member, ensuring a secure flow path area for the working fluid to be supplied to the frequency sensitive part, enhancing its performance and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a partition member is provided on the bottom part side of the cylinder to partition the cylinder chamber and reservoir chamber, then the structural integrity and sealing are improved, but the flow path area for introducing working fluid into the frequency sensitive part cannot be secured
Solution Approach 1:
The partition member is divided into a first partition member and a second partition member positioned at different locations. The first partition member has a first flow path, while the second partition member has a second flow path with a larger flow path area that leads to the frequency sensitive part. This segmentation allows each partition member to serve different functions: the first for basic separation and the second for ensuring adequate flow area to the frequency sensitive part.
Solution Approach 2:
The second flow path acts as an intermediary channel between the cylinder chamber and the frequency sensitive part. It provides a dedicated passage with sufficient cross-sectional area to ensure adequate working fluid flow to the frequency sensitive part, overcoming the limitation imposed by the first partition member's smaller flow path.
2Length of moving object
If the base valve is made thinner to reduce axial length, then the overall shock absorber length is reduced, but the strength and durability of the base valve may be compromised
Solution Approach 1:
The partition member and base valve are made from different materials with different hardness values. The base valve is constructed from a material with higher hardness and strength properties, allowing it to be made thinner while maintaining adequate strength and durability. This material differentiation enables the base valve to achieve reduced axial length without compromising structural integrity.
3Ease of manufacture
If the same material is used for both the partition member and base valve, then manufacturing is simplified, but production costs and material optimization are compromised
Solution Approach 1:
Different materials with different hardness values are used for the partition member and base valve based on their specific functional requirements. The base valve uses a harder material to withstand high contact stresses and maintain dimensional stability, while the partition member uses a different material optimized for its sealing and flow control functions. This local quality differentiation optimizes overall performance and durability.
Solution Approach 2:
The hardness parameter of the materials is specifically adjusted for each component based on its functional demands. The base valve is made with higher hardness to resist deformation under load, while the partition member uses a different hardness level appropriate for its sealing and flow path functions. This parameter optimization improves both component longevity and manufacturing efficiency.
Data Source
AI summary
Provided is a shock absorber having a cylinder having a bottomed cylindrical shape in which a working fluid is sealed, a piston provided inside the cylinder and dividing the inside of the cylinder into two cylinder chambers, a piston rod to which the piston is fastened, and a reservoir chamber in which the working fluid and a gas are sealed, and the shock absorber includes a partition member partitioning the cylinder chamber in the cylinder and the reservoir chamber and including a first partition member having a first flow path which allows communication between the cylinder chamber and the reservoir chamber, and a frequency sensitive part provided on a bottom part side of the cylinder with respect to the first partition member and to which the working fluid is supplied through the first flow path.