Rotary Damper Seal Structure for Oil Leakage-Free Assembly
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Solution Overview
Problem
Conventional rotary dampers experience oil leakage from the gap between the partition wall and the shaft portion, leading to deterioration of performance, including inconsistent operation time and reduced braking force due to insufficient oil supply for the valve.
Innovation Solution
A rotary damper design featuring a first recess on the partition wall and a second recess on the shaft portion, where an elastic body is installed to seal the gap without compression, forming a space for easy assembly and preventing oil leakage, along with a vane and oil passages that adjust flow rates based on load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional rotary damper structure is used, then the device is simple in structure, but oil flows out from the gap between the partition wall and the shaft portion causing deterioration of characteristics
Solution Approach 1:
The harmful oil outflow from the gap between the partition wall and shaft portion is extracted and eliminated by introducing a sealing structure (elastomer) that specifically targets and removes this leakage path, thereby improving rotary damper characteristics without complicating the overall structure
Solution Approach 2:
An elastomer sealing element is introduced as an intermediary component between the partition wall and shaft portion to prevent direct oil leakage, serving as a mediator that blocks the harmful oil flow while maintaining the simplicity of the original rotary damper structure
2Reliability
If an elastic body is installed to seal the gap, then oil leakage is prevented, but the assembly process becomes difficult due to compression requirements
Solution Approach 1:
The elastomer is pre-compressed during the assembly process by designing the first recess and second recess to provide preliminary compression space, allowing the elastic body to be installed in a compressed state initially and then expand to its sealing position, thereby preventing oil leakage while maintaining ease of assembly
Solution Approach 2:
The sealing approach is changed from a traditional radial seal to a combination of radial and axial sealing dimensions by utilizing both the first recess (radial direction) and second recess (axial direction), enabling the elastomer to be compressed and installed more easily while achieving effective sealing
3Reliability
If the elastic body is compressed during assembly, then it can seal the gap, but the assembly process is complicated and the elastic body may be damaged
Solution Approach 1:
The elastomer is pre-compressed in a controlled manner during assembly by designing the recess dimensions to provide appropriate compression space, allowing the elastic body to be installed without excessive compression that could cause damage, while still achieving the necessary sealing function
Solution Approach 2:
The compression parameters of the elastomer are optimized by carefully designing the depth and dimensions of the first and second recesses, changing the compression ratio and force parameters to achieve effective sealing while preventing damage to the elastic body and simplifying the assembly process
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
Prevents oil leakage, ensures sufficient oil supply for the valve, stabilizes operation time under varying loads, and maintains braking force by sealing the gap between the partition wall and shaft portion, while allowing reduced resistance when rotating in either direction.
Implementation Method 1
an elastic body installed in the first recess and closely contacting the shaft portion to seal a gap between the partition wall and the shaft portion
Data Source
AI summary
A rotary damper having a cylinder (10) with a partition wall (13); a rotor (20) having a shaft portion (21) opposing the partition wall; a first recess (16) formed on a distal end surface of the partition wall; an elastic body (40) installed in the first recess and closely contacting the shaft portion to seal a gap between the partition wall and the shaft portion; and a second recess (27) formed in a part of an outer peripheral surface of the shaft portion not opposing the distal end surface of the partition wall during operation, and forming a space (50) into which the elastic body can be inserted without being compressed by facing an opening of the second recess to an opening of the first recess during assembly.