Hydraulic Mount Sub-Chambers for Vibration Isolation
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Solution Overview
Problem
Conventional shock absorbers in vehicles struggle to effectively isolate high-frequency vibrations and small amplitude disturbances, leading to compromised ride comfort and increased transmission of vibrations to the vehicle structure.
Innovation Solution
The development of hydraulic mounts with a novel configuration, including multiple resilient members and a diaphragm, which create sub-chambers and orifices to manage fluid flow and provide enhanced damping characteristics across a broader frequency range (0-100 Hz or 0-200 Hz), effectively isolating both low and high-frequency vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional shock absorbers are used to address primary ride perturbations, then low-frequency vibration isolation is improved, but high-frequency vibration isolation deteriorates
Solution Approach 1:
The shock absorber is divided into two independent hydraulic circuits: a first circuit with a first orifice for low-frequency vibrations and a second circuit with a second orifice for high-frequency vibrations. This segmentation allows each circuit to be optimized for its specific frequency range, resolving the contradiction between low-frequency and high-frequency vibration isolation performance.
2Object-affected harmful factors
If shock absorbers are designed for high-amplitude, low-frequency events, then primary ride perturbations are addressed, but small amplitude, high-frequency disturbances are not effectively isolated
Solution Approach 1:
The hydraulic mount is segmented into two circuits with different orifice characteristics. The first circuit handles large amplitude, low-frequency disturbances while the second circuit handles small amplitude, high-frequency disturbances. This allows the system to address both types of harmful factors simultaneously without compromising performance in either range.
3Ease of operation
If conventional shock absorbers are used, then ride comfort is maintained for low-frequency vibrations, but ride comfort deteriorates due to transmitted high-frequency vibrations
Solution Approach 1:
By segmenting the hydraulic circuit into two parallel paths with differently sized orifices, the system can simultaneously optimize for both low-frequency and high-frequency vibration isolation. This dual-circuit design ensures ride comfort is maintained across the entire vibration spectrum, resolving the contradiction in ride comfort performance.
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 hydraulic mounts significantly improve ride comfort by substantially isolating small vibrations, regardless of initial motion direction, and tailor dynamic responses to vehicle-specific design parameters, enhancing the overall damping performance and ride quality.
Implementation Method 1
A first resilient member disposed on the orifice plate defines a first sub-chamber in the first chamber and a second resilient member disposed on the orifice plate defines a second sub-chamber in the second chamber
Implementation Method 2
first resilient member disposed on the orifice plate defines a first sub-chamber
Implementation Method 3
The HEM 200 includes metal inserts 203, 204 to support the forces and torques generated by the engine and an elastomeric element 205 or matrix to dampen vibrations
Data Source
AI summary
A hydraulic mount for a vehicle shock absorber includes a first housing portion, a second housing portion, an orifice plate and a diaphragm connected together to define a first chamber and a second chamber in the hydraulic mount. A first resilient member disposed on the orifice plate defines a first sub-chamber in the first chamber and a second resilient member disposed on the orifice plate defines a second sub-chamber in the second chamber.