Monotube Damper Rebound Stop With Flange-Ledge Retention
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Solution Overview
Problem
Hydraulic rebound stop arrangements in damper assemblies present challenges during manufacturing and component retention over the lifetime of the damper assembly, particularly in monotube designs.
Innovation Solution
A monotube damper assembly with a hydraulic rebound stop (HRS) assembly featuring a tubular portion and a flange portion that engages a corresponding ledge to secure the HRS assembly within the housing, preventing movement and ensuring proper positioning, and a tubular portion with recesses that decrease in depth towards the flange portion for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydraulic rebound stop arrangement is used in a monotube damper assembly, then additional damping force is generated over a predefined end section of the piston rod travel range, but challenges arise in manufacturing and retaining components in their design locations over the lifetime of the damper assembly
Solution Approach 1:
The HRS assembly is segmented into distinct functional components: a piston rod with a flange portion, a separate HRS body with a recess, and an O-ring seal. This segmentation allows each component to be manufactured independently using optimal processes while ensuring proper assembly and retention through the flange-recess interface.
Solution Approach 2:
The HRS assembly is pre-assembled with the O-ring seal installed in the recess before integration into the damper body. The flange portion is designed to engage the recess in a predetermined manner, ensuring proper positioning and retention is established before the damper assembly is completed, preventing manufacturing challenges during final assembly.
2Ease of manufacture
If the HRS assembly components are designed for easy assembly, then manufacturing becomes simpler, but component retention and positioning stability may be compromised
Solution Approach 1:
The HRS body features a localized recess with specific geometric characteristics designed to receive and retain the flange portion. The recess provides a precise mating feature that ensures stable positioning of the piston rod assembly while allowing for straightforward assembly. The local geometry of the recess-flange interface creates a stable connection without requiring complex assembly procedures.
Data Source
AI summary
A monotube damper assembly includes a housing defining a main compartment extending along a center axis between a first end and a second end; and a hydraulic rebound stop (HRS) assembly disposed within the housing adjacent to the first end and including an HRS sleeve having a tubular portion and a flange portion extending radially outwardly from the tubular portion at a first axial end thereof and configured to engage a corresponding ledge for locating the HRS assembly in the main compartment and preventing the HRS assembly from moving toward the second end, the tubular portion defining a plurality of recesses each extending axially from a second axial end of the tubular portion opposite the first axial end and having a depth that gradually decreases along a length of the tubular portion toward the flange portion An HRS assembly for a monotube damper assembly is also provided.