Hydraulic Damper Spring Valve Axial Projections
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Solution Overview
Problem
Existing hydraulic dampers face significant friction issues due to eccentricity and radial dimensional tolerances in valve assemblies, leading to hysteresis and inconsistent damping forces during piston rod acceleration and deceleration, affecting damper performance and production repeatability.
Innovation Solution
The spring seat of the valve assembly features axial projections that perimetrically engage the disc, eliminating the need for guidance and reducing friction by creating a circular gap between the seat and supporting member, ensuring centering and preventing sliding contact, thus minimizing friction and hysteresis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the spring seat is disposed slidably around the supporting member to enable axial movement, then the valve assembly can operate with adjustable spring positioning, but friction occurs between the spring seat and supporting member due to eccentricity and radial dimensional tolerances
Solution Approach 1:
The invention extracts the guidance function from the supporting member by creating a circular gap between the spring seat and supporting member. The spring seat is now guided only by the disc through axial projections, eliminating the harmful sliding contact with the supporting member while maintaining necessary axial movement capability.
Solution Approach 2:
The disc acts as an intermediary element that provides guidance for the spring seat through axial projections. This mediator transfers the guidance function from the supporting member to the disc, allowing the spring seat to move axially without direct contact with the supporting member, thus eliminating friction.
2Manufacturing precision
If the spring seat slides on the supporting member to maintain position, then axial positioning is achieved, but hysteresis occurs due to friction during piston rod acceleration and deceleration
Solution Approach 1:
The invention removes the supporting member from the guidance function, creating a circular gap that eliminates sliding contact. Positioning is achieved through axial projections on the disc alone, extracting the harmful friction element while maintaining positioning capability.
Solution Approach 2:
The disc provides self-guidance for the spring seat through its axial projections, eliminating the need for the supporting member to provide guidance. The system uses itself (the disc) to provide the guidance function, avoiding the friction problem entirely.
3Ease of operation
If axial projections are added to the spring seat for centering, then guidance is achieved without sliding contact, but device complexity increases
Solution Approach 1:
The axial projections on the disc serve multiple functions: they provide centering guidance for the spring seat, maintain axial positioning, and eliminate the need for sliding contact with the supporting member. This multi-functionality adds guidance capability without proportionally increasing 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
This design achieves an average 77-82% reduction in the 'force gap' between damping forces during acceleration and deceleration, enhancing damper sensitivity and repeatability while reducing production-specific losses and costs.
Implementation Method 1
a spring preloaded between the spring seat and the supporting member
Implementation Method 2
the spring seat of said at least one spring valve assembly comprises at least one axial projection perimetrically engaging said at least one disc
Implementation Method 3
the flow of the working liquid is controlled within said tube during the rebound and the compression stroke of the piston body
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
A hydraulic damper (2), in particular a motor vehicle suspension damper, comprising a tube (22) filed with working liquid inside of which a slidable piston body (231) attached to a piston rod (21 ) led outside the damper (2) is disposed, wherein the flow of the working liquid is controlled within side tube (22) during the rebound and the compression stroke of the piston body (231) by at least one spring valve assembly (23, 26) provided with an axial member (211, 311) and rebound and compression valve assemblies (28b, 29; 27, 28c) surrounding the axial member (211, 311), wherein said at least one spring valve assembly (28b, 28c) comprises a body (231, 261) provided with through flow channels (282), at least one deflectable disc (281) covering these through flow channels (282), a supporting member (285, 285c) fixed to said axial member (211, 311) for clamping said at least one disc (281) at the inner circumferential part thereof, a spring seat (283b, 283c) disposed around said supporting member (285, 285c) and abutting said at least one disc (281) in at least one radial position (2831, 2832) at the outer circumferential part thereof, and a spring (284) preloaded between the spring seat (283b, 283c) and the supporting member (285, 2851c). In order to minimize friction between cooperating elements of the valve assembly, as well as to achieve comparable working characteristic of all dampers in the line production said spring seat comprises at least one axial projection perimetrically engaging said at least one disc and a circular gap is provided between said spring seat and said supporting member.