Shock Absorber Fluid Encapsulation via Injection Nozzle and Mechanical Sealing
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Solution Overview
Problem
Conventional methods for encapsulating fluid in mono-tube shock absorbers face issues such as sludge generation during welding, complex assembly processes, and limitations in using separate rod guides and oil seals, which affect the length and operational efficiency of the shock absorber.
Innovation Solution
An apparatus and method that utilize a fluid injection nozzle, position securing mechanism, and seal securing mechanism to inject gas and oil into the shock absorber, allowing for the use of both integrated and separate rod guides and oil seals, and secure the seal unit through curling or caulking, eliminating the need for welding and simplifying the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding is used to seal the gas injection hole, then the gas chamber is sealed, but sludge is generated during welding and cooling is required
Solution Approach 1:
The gas injection hole is removed from the tube after gas injection, eliminating the need for welding and preventing sludge generation. The hole is extracted as a temporary feature used only during the filling process.
Solution Approach 2:
The gas injection hole is formed in advance before the sealing operation, allowing gas to be injected through it. The hole is then removed, and the sealing is performed without welding, avoiding sludge generation entirely.
2Quantity of substance
If the piston rod is pushed down deeply to supply oil, then oil storage space is secured, but the overlapping area increases and shock absorber length decreases
Solution Approach 1:
The piston rod is made movable and adjustable in position. During assembly, it can be pushed down to the required depth to secure adequate oil storage space, and then fixed at that position, allowing dynamic adjustment of the shock absorber length.
3Reliability
If the seal assembly is inserted after oil injection, then the tube is sealed, but the assembly process becomes complex
Solution Approach 1:
The seal assembly is divided into separate components: the rod guide and oil seal are separated and can be assembled independently. This segmentation simplifies the assembly process by allowing each component to be installed separately rather than as a single complex unit.
Solution Approach 2:
The rod guide is temporarily fixed to the tube before oil injection, providing a preliminary sealing structure. After oil injection, the seal assembly is completed by adding the oil seal component, simplifying the overall assembly sequence.
4Reliability
If welding is used to seal the gas chamber, then the gas is contained, but additional cooling time is required
Solution Approach 1:
The welding process is replaced with a mechanical removal and sealing process. The gas injection hole is removed mechanically, and sealing is achieved through the cap structure without thermal welding, eliminating the need for cooling time entirely.
Data Source
AI summary
Disclosed is a fluid encapsulating apparatus and method. The apparatus includes a fluid injection nozzle for injecting gas and oil into a tube of the shock absorber through a fluid injection aperture formed in the tube; a position securing mechanism supporting a seal unit of the shock absorber at a certain position in cooperation with a supporter provided to a piston rod of the shock absorber during oil injection; and a seal securing mechanism sealingly securing the seal unit after injection of the gas and oil. Shock absorbers manufactured thereby are also disclosed.