Vibration Damper Closure Package Guide Bush Collar Design
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Solution Overview
Problem
Existing closure packages for vibration dampers face challenges in maintaining a pressure-tight seal and secure guidance of the piston rod due to the guide bush potentially loosening over time, leading to premature failure of the sealing unit and guide bush displacement.
Innovation Solution
A guide bush with a radially outward-pointing collar is integrated into the closure package, allowing for a form-fitting arrangement within the base body, preventing the guide bush from detaching and enhancing the contact geometry for the sealing unit, thus ensuring the guide bush remains captive and reducing wear on the sealing elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a guide bush is pressed into an opening in the base body to guide the piston rod, then the guide bush can be installed easily, but the guide bush may loosen over time due to temperature changes and material expansion, leading to migration and failure
Solution Approach 1:
The guide bush is segmented into two functional parts: an inner guiding section and an outer collar section. The collar portion extends radially outward and engages with a corresponding collar seat in the base body, creating a form-fit connection that prevents loosening while the inner section maintains piston rod guidance functionality.
Solution Approach 2:
The solution transitions from a simple radial press-fit arrangement to a three-dimensional form-fit connection by adding the radially outward collar that engages with the collar seat. This dimensional addition creates mechanical interlocking that prevents axial migration while maintaining ease of installation.
2Device complexity
If the guide bush is pressed into the base body opening, then assembly is simple, but the press fit can loosen due to thermal expansion differences, causing the guide bush to migrate
Solution Approach 1:
The invention changes the geometric parameters of the guide bush by adding a radially outward collar with specific dimensions that engage with the collar seat. This parameter modification creates a form-fit connection that is insensitive to thermal expansion differences between materials, maintaining position stability without increasing assembly complexity.
3Device complexity
If the sealing unit is supported below the guide bush without a collar, then the structure is simple, but the sealing elements suffer from increased wear and extrusion damage during operation
Solution Approach 1:
The collar is positioned preliminarily above the sealing unit to provide a stable support surface for the rod sealing element. This preliminary structural provision prevents the sealing element from suffering extrusion damage and wear during operation, as the collar creates a proper contact geometry before the sealing action occurs.
Data Source
Figure 1
Figure 2~2a
AI summary
The present invention relates to a closure package (1) for closing a damper tube (10) for a vibration damper, with a main body (11) which is designed for sealing arrangement in the damper tube (10) and through which a piston rod (12) of the vibration damper can be sealingly guided, and wherein the main body (11) has an opening in which a guide bush (13) for guiding the piston rod (12) is inserted and wherein at least one sealing unit (14, 15) is provided for sealing contact with the piston rod (12). According to the invention, the guide bush (13) has a circumferential collar (16) pointing radially outwards at one end face and adjoined by the sealing unit (14).