Sintered Rod Guide Assembly for Shock Absorber Sealing
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Solution Overview
Problem
Existing shock absorbers face challenges in adequately sealing oil and gas within the cylinder while allowing the rod to move axially, and the production and installation of solid aluminum rod guides are costly and time-consuming.
Innovation Solution
A sintered metal rod guide assembly with a seat and a seal secured by stake holds, featuring a density gradient and anti-leak grooves, is used to enhance sealing and reduce manufacturing costs, incorporating a sintered metal rod guide with a seat and a seal that includes a static, dust, and dynamic seal portion, and a garter spring for improved sealing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a solid aluminum rod guide is used, then the structural strength is sufficient, but the manufacturing cost and production time increase
Solution Approach 1:
The patent employs a sintered metal rod guide with controlled porosity (3-15% open cell structure) made from iron powder and binder materials. This porous structure reduces material density and manufacturing complexity compared to solid aluminum, while maintaining sufficient mechanical strength through the sintering process that creates interlocking particle structures. The porous nature also allows for oil retention and lubrication within the guide structure.
Solution Approach 2:
The rod guide is constructed as a composite material system combining sintered metal particles (iron powder) with organic binder materials. This composite approach enables tailoring of mechanical properties, porosity, and lubrication characteristics while reducing dependence on expensive solid aluminum machining. The composite structure provides both structural integrity and functional properties for shock absorber application.
2Reliability
If a seal is added to seal oil and gas, then the sealing effectiveness improves, but the device complexity increases
Solution Approach 1:
The patent integrates the seal directly into the rod guide assembly by positioning it within a dedicated seat structure that is part of the sintered metal rod guide. The seal combines multiple functions (oil sealing, gas sealing, and rod guidance) into a single integrated assembly, reducing overall device complexity while maintaining effective sealing. The stake hold mechanism further integrates the seal securing function into the same structural element.
Solution Approach 2:
The seal acts as an intermediary element between the rod guide and the piston rod, providing the sealing function without requiring complex separate systems. The anti-leak groove and stake hold structures serve as intermediary features that simplify the overall sealing system by incorporating retention and positioning functions directly into the rod guide structure rather than requiring separate complex mechanisms.
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 seals the oil and gas within the cylinder, reduces manufacturing costs, and allows for axial movement of the rod, improving the efficiency and cost-effectiveness of the shock absorber assembly.
Implementation Method 1
The sintered metal rod guide is formed from iron powder and binder materials through a sintering process that creates a porous structure with controlled open cell content of 3-15%
Implementation Method 2
The porous structure with controlled open cell content enables the rod guide to retain oil and provide continuous lubrication through capillary wicking to the rod surface
Implementation Method 3
The dynamic seal portion includes a garter spring that provides continuous contact force between the seal lip and the rod surface, compensating for wear and maintaining sealing effectiveness
Data Source
AI summary
A rod guide assembly for a shock absorber includes a sintered metal rod guide and a seal. The sintered metal rod guide has a seat. The seal is disposed in the seat and secured to the sintered metal rod guide with a plurality of stake holds.