Seal Guide Unit Radial Movement Friction Reduction
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Solution Overview
Problem
Existing seal guide units for piston rods in vibration dampers face challenges in maintaining seal tightness at low temperatures and are complicated to assemble, leading to potential leaks and increased assembly time due to reduced elasticity of the piston rod seal and complex designs.
Innovation Solution
A seal guide unit design featuring a piston rod seal arrangement with a sliding element that has a lower friction coefficient than other components, allowing it to follow radial movements of the piston rod without deformation, and optionally including a friction-reducing coating or additional components to enhance sealing and assembly ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piston rod seal is made more elastic to follow radial movements at low temperatures, then sealing reliability improves, but the seal becomes more prone to deformation and loses structural stability
Solution Approach 1:
The seal guide unit is divided into multiple guide elements (first guide element, second guide element) that are fixedly connected, creating a segmented structure. This segmentation allows each element to independently support and guide the piston rod, providing both structural stability and the ability to follow radial movements through the coordinated action of multiple segments.
Solution Approach 2:
A sliding element is introduced as an intermediary component between the piston rod seal and the guide elements. This sliding element has a lower friction coefficient than other components, reducing frictional resistance and allowing the seal to follow radial movements of the piston rod more easily without requiring excessive elasticity, thereby maintaining both reliability and structural stability.
2Reliability
If a radially moveable piston rod seal is used to follow radial movements, then sealing reliability improves, but device complexity increases and assembly becomes more difficult
Solution Approach 1:
The sliding element combines multiple functions into a single component: it acts as both a friction-reducing interface and a guide for the piston rod seal. By merging these functions, the design achieves reliable sealing without requiring complex radially moveable mechanisms, thereby reducing device complexity while maintaining sealing reliability.
Solution Approach 2:
The sliding element with its lower friction coefficient enables the piston rod seal to automatically follow radial movements of the piston rod through friction reduction alone, without requiring active control mechanisms or complex radial adjustment systems. This self-service approach simplifies the overall device structure while maintaining reliable sealing.
3Ease of operation
If the sliding element has a lower friction coefficient to reduce friction, then ease of operation improves, but manufacturing complexity increases due to additional coatings or materials
Solution Approach 1:
The friction coefficient parameter of the sliding element is specifically optimized to be lower than that of other components. This parameter change can be achieved through material selection (e.g., using materials with inherently low friction coefficients) or surface treatments, balancing the improvement in ease of operation with manageable manufacturing complexity.
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 ensures consistent seal integrity by allowing the piston rod seal to maintain its shape and prevent leaks across temperature variations and simplifies assembly by reducing friction and component complexity.
Implementation Method 1
the sliding element has at least partially a lower friction coefficient than the other individual parts of the seal guide unit which directly axially adjoin the piston rod seal arrangement and which are in frictional contact with the sliding element
Data Source
AI summary
A seal guide unit for guiding and sealing a piston rod of a vibration damper having a first guide element and a second guide element fixedly connected to the first guide element and arranged coaxial to the first guide element, and a radially moveable piston rod seal arrangement arranged coaxially between the two guide elements and is at least indirectly surrounded in circumferential direction by at least one guide element, including a defined radial annular gap, and comes in at least indirect axial contact with at least one guide element. The piston rod seal arrangement includes a piston rod seal and a sliding element which encloses the piston rod seal in circumferential direction and axially limits the piston rod seal at least on one side. The sliding element has a lower friction coefficient than parts of the seal guide unit adjoin the piston rod seal arrangement.