Fluid-Sealed Engine Mount Membrane Lip for Low-Friction NVH Damping
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Solution Overview
Problem
Conventional fluid-sealed engine mounts generate noise due to friction between the membrane and nozzle unit, which affects the robustness and damping performance, limiting the tuning of dynamic characteristics and NVH performance.
Innovation Solution
A fluid-sealed engine mount design featuring a membrane with a circumferential membrane lip inserted into a nozzle unit, including membrane and nozzle channels, and flow limiting protrusions to minimize friction and enhance vibration damping, supported by upper and lower support protrusions to reduce contact area and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the edge of the membrane is mounted to the nozzle unit without horizontal clearance, then the membrane is constrained to reduce movement, but friction noise is generated and robustness deteriorates
Solution Approach 1:
A membrane lip is introduced as an intermediary component between the membrane edge and the nozzle unit. The membrane lip extends circumferentially from the membrane edge and is inserted into the nozzle unit, serving as a mediator that reduces direct contact and friction between the membrane and nozzle unit while maintaining proper positioning and stability.
2Reliability
If the membrane robustness is increased to reduce friction, then dynamic characteristics improve, but damping performance decreases
Solution Approach 1:
The membrane structure is segmented into two functional parts: the membrane body (center portion) which maintains robustness and structural integrity, and the membrane lip (edge portion) which provides flexibility and damping. This segmentation allows each part to optimize its properties independently - the membrane body can be made robust while the membrane lip maintains damping performance through its flexible design.
3Manufacturing precision
If the membrane edge is mounted without clearance to the nozzle unit, then positioning is improved, but friction between membrane and nozzle unit increases
Solution Approach 1:
The membrane lip acts as an intermediary that inserts into the nozzle unit, providing precise positioning and mounting stability while reducing the contact area and friction force between the membrane assembly and the nozzle unit through its specific geometric design.
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
Improves vibration damping performance and reduces dynamic characteristics, enhancing noise, vibration, and harshness (NVH) performance and ride quality by minimizing friction noise and optimizing fluid flow through specific channel configurations.
Implementation Method 1
a membrane arranged in a center portion of the nozzle unit in a radial direction of the nozzle unit and elastically vibrating by the fluid flow
Implementation Method 2
The fluid absorbs engine vibration while passing through a fluid passage that is positioned between an upper fluid chamber and a lower fluid chamber
Implementation Method 3
the membrane may include: a membrane lip, which may be formed by extending in a circumferential direction of the membrane at an edge portion thereof and be inserted in and fixed to an inner circumferential portion of the nozzle unit
Data Source
AI summary
A fluid-sealed engine mount controls the movement of an engine mounted to a vehicle body and insulates from vibration. In particular, the fluid-sealed engine mount improves vibration damping performance and dynamic characteristics compared to a conventional engine mount, thereby enhancing noise, vibration, and harshness (NVH) performance.