Cylinder Cushion Structure for Compact Shock Attenuation
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Solution Overview
Problem
Existing cylinder devices face challenges in effectively attenuating shock upon full extension of the piston rod while maintaining a compact configuration, as conventional solutions either result in a large size due to the use of low rigidity members or require multiple high rigidity members in series, leading to durability issues and potential noise.
Innovation Solution
A cylinder device with a cushion member comprising a first shock absorbing member and a second shock absorbing member, where the second member with lower hardness abuts the rod guide earlier, providing high flexibility, and the first member with higher hardness applies force in parallel, achieving high load characteristics and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If low rigidity members are used for shock attenuation, then high flexibility is achieved, but device size increases
Solution Approach 1:
The cushion member uses a composite structure with two different elastic members having different hardness values. The first elastic member has higher hardness than the second elastic member, creating a gradient structure that optimizes both flexibility and compactness. This composite approach allows the device to achieve high shock attenuation performance in a compact form factor.
2Strength
If multiple high rigidity members are used in series for shock attenuation, then load characteristics improve, but device complexity increases and durability decreases
Solution Approach 1:
The cushion member is segmented into two distinct elastic members with different hardness properties. The first elastic member (higher hardness) and second elastic member (lower hardness) work in parallel to provide progressive shock attenuation. This segmentation allows each member to contribute differently to load characteristics while maintaining overall structural simplicity and improved durability compared to series configurations.
Solution Approach 2:
Instead of arranging multiple members in series along the axial direction (one dimension), the invention places two elastic members in parallel within the radial dimension. The first elastic member is positioned at the outer periphery while the second elastic member is positioned at the inner periphery, both supporting the piston rod simultaneously. This dimensional change simplifies the structure while maintaining excellent load characteristics.
3Strength
If multiple high rigidity members are used in series for shock attenuation, then load characteristics improve, but noise increases
Solution Approach 1:
The parallel arrangement of two elastic members with different hardness values creates a composite cushioning system that attenuates shock more smoothly than single-member or series configurations. The softer second elastic member absorbs initial impacts while the harder first elastic member provides structural support, reducing impact noise and vibration throughout the system.
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 attenuates shock with high flexibility and load characteristics, improving durability and compactness, while preventing hydraulic lock and reducing noise by eliminating the need for multiple high rigidity members in series.
Implementation Method 1
a second shock absorbing member (102) disposed inside the first shock absorbing member (101) in the radial direction, abutting the rod guide (28) earlier than the first shock absorbing member (101)
Implementation Method 2
a first shock absorbing member (101) and a second shock absorbing member (102) disposed inside the first shock absorbing member (101) in the radial direction
Implementation Method 3
a cushion member provided between the piston and the blocking member and abutting the blocking member through extension of the piston rod
Data Source
AI summary
A cylinder device includes a piston rod having one end side connected to a piston and the other end side inserted through a blocking member, and extending to the outside of a cylinder, and a cushion member provided between the piston and the blocking member and abutting the blocking member through extension of the piston rod. The cushion member has a first member, and a second member provided inside the first member in a radial direction, abutting the blocking member earlier than the first member and having a hardness smaller than that of the first member, and the first member and the second member apply a force to the blocking member in parallel.