Hydroelastic Joint With Circumferential Hydraulic Chambers
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Solution Overview
Problem
Existing hydro-elastic joints for vehicles face challenges in consistently filtering vibrations in all radial directions without specific angular orientation, leading to issues in mounting and effectiveness across different frequency ranges of hybrid and combustion engine vehicles.
Innovation Solution
A hydro-elastic functional element with a circumferentially extending row of at least three hydraulic chambers and throttle lines allowing liquid communication between adjacent chambers, enabling balanced working volume variation and hydraulic filtering along any radial axis, facilitating easy assembly and mounting without specific orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous peripheral hydraulic chamber is used, then homogeneous hydraulic filtering in all radial directions is achieved, but manufacturing precision deteriorates due to inevitable tolerances making thin layer arrangements industrially problematic
Solution Approach 1:
The continuous peripheral hydraulic chamber is segmented into multiple discrete hydraulic chambers arranged circumferentially. Each chamber is separated by elastic septa, creating distinct compartments that collectively provide homogeneous filtering in all radial directions while allowing for manufacturing tolerances in individual chamber dimensions.
Solution Approach 2:
The hydraulic chambers are positioned at specific angular intervals around the periphery, with each chamber optimized for its local radial direction. This distribution of localized filtering zones creates overall homogeneous filtering performance while accommodating manufacturing variations in each individual chamber.
2Reliability
If hydraulic chambers are arranged to filter radial excitations, then vibration filtering improves, but the joint cannot be mounted without specific angular orientation
Solution Approach 1:
The hydraulic chambers are arranged asymmetrically in the circumferential direction with specific angular spacing, creating omnidirectional filtering capability. This asymmetric circumferential distribution allows the joint to effectively filter vibrations from any radial direction regardless of mounting orientation, eliminating the need for specific angular alignment during installation.
Solution Approach 2:
The circumferential arrangement of hydraulic chambers provides universal filtering capability in all radial directions simultaneously. The joint can filter vibrations from any direction without requiring reconfiguration or specific mounting orientation, making it universally applicable to various installation scenarios.
3Strength
If radial stiffness is increased to provide guiding function, then structural stability improves, but noise transmission increases due to facilitated vibration transmission
Solution Approach 1:
Hydraulic chambers filled with incompressible fluid are integrated into the elastomeric body to provide radial stiffness through hydraulic pressure. The fluid acts as a stiffening element that resists radial compression while the elastomeric matrix maintains damping capabilities, creating a composite structure that provides both structural stability and vibration isolation.
Solution Approach 2:
The joint combines rigid hydraulic fluid chambers with flexible elastomeric material to create a composite structure. The hydraulic fluid provides radial stiffness for guiding function, while the elastomeric matrix provides vibration damping, achieving both structural stability and noise reduction through material composition rather than单一 material properties.
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 provides consistent hydraulic filtration in all radial directions, simplifies manufacturing and assembly, and effectively dampens vibrations across various frequency ranges, enhancing noise reduction in vehicles.
Implementation Method 1
at least one row of hydraulic chambers extending circumferentially and comprising at least three hydraulic chambers and at least one throttle line which allows a liquid communication between each pair of respective circumferentially adjacent hydraulic chambers so that variation of at least one working volume of the hydraulic chambers by working load vibrations can be balanced by allowing flow of a liquid
Implementation Method 2
The first family includes hydro-elastic joints which provide two hydraulic chambers opposed at 180° in a preferential radial direction corresponding to the main direction of excitation
Implementation Method 3
The liquid contained in these chambers can circulate from one to the other for low frequencies of transverse excitation, while from a certain frequency a resonance setting blocks its migration which generates a phase shift associated with a dynamic stiffening drop used to filter certain vibrations
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention relates to a hydroelastic functional element (3) intended to be deposited into a hydroelastic joint (1) for damping load vibrations between two structural parts, in particular a vehicle body and wheel suspension, the hydroelastic functional element having a longitudinal axis (2) and a circumferential direction about said longitudinal axis, characterized by at least one row of hydraulic chambers (24, 26) extending circumferentially and including at least three hydraulic chambers and at least one throttling channel (40, 38), the at least one throttling channel of which enables liquid communication between each pair of respective circumferentially adjacent hydraulic chambers so that a variation of at least one working volume of the hydraulic chambers due to load vibrations can be balanced by enabling a liquid flow into at least one of the other hydraulic chambers.