Damper Air Spring Diaphragm Attachment via Segmented Case
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Solution Overview
Problem
Existing dampers with air springs face complexity in attaching the diaphragm due to potential welding or crimping distortions, requiring additional cylinder configurations to prevent deformation, which complicates the damper design.
Innovation Solution
A damper design featuring a first attachment case with an inner-diameter step portion that fits over the cylinder and a second attachment case with an external cylinder portion, both secured with non-removable fixing bands and O-rings, allowing easy attachment and removal of the diaphragm without causing deformation, and facilitating smooth piston movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding method is used to attach the first end of the diaphragm to the cylinder, then the attachment strength is improved, but the cylinder may undergo welding distortion within the sliding range
Solution Approach 1:
The attachment case is divided into multiple sections: an expanded-diameter cylinder portion for attachment, a reduced-diameter cylinder portion for sealing, and an inner-diameter step portion for positioning. This segmentation allows the attachment function to be separated from the sliding surface, preventing distortion while maintaining strength.
Solution Approach 2:
The attachment case acts as an intermediary component between the diaphragm and the cylinder. Instead of directly attaching the diaphragm to the cylinder (which causes distortion), the attachment case mediates this connection, providing a stable mounting surface away from the sliding range.
2Strength
If crimping method is used to attach the first end of the diaphragm to the cylinder, then the attachment strength is improved, but the cylinder may undergo crimping distortion within the sliding range
Solution Approach 1:
The attachment case is divided into multiple sections: an expanded-diameter cylinder portion for attachment, a reduced-diameter cylinder portion for sealing, and an inner-diameter step portion for positioning. This segmentation allows the attachment function to be separated from the sliding surface, preventing distortion while maintaining strength.
Solution Approach 2:
The attachment case acts as an intermediary component between the diaphragm and the cylinder. Instead of directly attaching the diaphragm to the cylinder (which causes distortion), the attachment case mediates this connection, providing a stable mounting surface away from the sliding range.
3Shape
If the welded or crimped portion is limited to the lower end of the cylinder, then the sliding range is protected from distortion, but the configuration becomes complicated
Solution Approach 1:
The attachment case is divided into multiple sections: an expanded-diameter cylinder portion for attachment, a reduced-diameter cylinder portion for sealing, and an inner-diameter step portion for positioning. This segmentation allows the attachment function to be separated from the sliding surface, preventing distortion while maintaining strength.
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 design allows for easy and stable attachment of the diaphragm to the damper main body, preventing deformation and simplifying the configuration, while ensuring secure sealing and reduced assembly resistance, thus enhancing the damper's operational efficiency and ease of maintenance.
Implementation Method 1
the first attachment case is fitted on an outer periphery of the cylinder via an O-ring provided on an inner periphery of the first attachment case
Data Source
AI summary
A damper with an air spring includes: a damper main body having a cylinder and a piston rod inserted into the cylinder; and a cylindrical diaphragm attached to a side of the cylinder at a first end thereof and to a side of the piston rod at a second end thereof and forming an air chamber around the damper main body, in which a first attachment case to which the first end of the diaphragm is attached is fitted on an outer periphery of the cylinder, and an inner-diameter step portion of the first attachment case is brought into abutting contact with an upper end portion of the cylinder in an axial direction thereof, while a second attachment case to which the second end of the diaphragm is attached is fixed to the piston rod.