Engine Mount Fluid Transfer for NVH Control
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Solution Overview
Problem
Existing engine mounts, such as semi-active and active mounts, face challenges in controlling dynamic characteristics due to inertia resistance and high costs associated with magnetorheological fluid (MRF) mounts, which also suffer from non-variable dynamic characteristics over time.
Innovation Solution
An engine mount design featuring a core, insulator, diaphragm, and an orifice assembly with a fluid transfer member that adjusts fluid flow between upper and lower liquid chambers based on driving conditions, allowing for dynamic characteristic variation through the use of a rubber membrane and motor-activated fluid transfer, effectively switching between fluid and rubber characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If semi-active mount or active mount is used to control dynamic characteristics, then NVH performance is improved, but the device becomes bulky and difficult to control due to inertia resistance of magnet
Solution Approach 1:
The patent extracts the magnet assembly from the engine mount structure, using it as a separate controllable component that can be independently activated. This allows the mount to transition from a passive rubber-based vibration isolator to an active control system when magnet activation is needed, improving NVH performance without permanently increasing structural complexity.
Solution Approach 2:
The engine mount transitions from a static rubber-based vibration isolation system to a dynamic system that can actively adjust its characteristics. The magnet assembly can be selectively activated based on driving conditions, allowing the mount to change its stiffness and damping properties in real-time to optimize NVH performance for different operating scenarios.
2Reliability
If MRF mount is used to improve ride comfort and handling performance, then dynamic characteristics are raised, but the price is expensive and dynamic characteristics become non-variable over time due to steel molecule sinking
Solution Approach 1:
The patent replaces the expensive magnetorheological fluid with a simpler, more cost-effective magnet assembly that can be selectively activated. This assembly uses conventional magnets and a fluid chamber, eliminating the need for costly MRF while achieving similar active control effects. The system maintains variable dynamic characteristics without the sedimentation issues that plague MRF systems.
Solution Approach 2:
The patent changes the physical state and distribution of the fluid in the mount by activating the magnet assembly. When the magnet is activated, it alters the magnetic properties of the fluid, changing the mount's stiffness and damping characteristics. This allows dynamic adjustment of ride comfort and handling performance without using expensive MRF materials.
3Force
If semi-active mount or active mount transmits force in vertical direction, then vibration isolation is achieved, but control is difficult due to action of inertia resistance of magnet
Solution Approach 1:
The patent introduces a fluid chamber as an intermediary between the magnet assembly and the mount structure. The fluid acts as a mediator that transmits the magnetic force generated by the magnet assembly to the mount body, enabling effective vibration isolation. This fluid intermediary smooths out the force transmission and reduces the direct impact of inertia resistance, making the system easier to control.
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 enhances NVH, ride comfort, and handling performance by dynamically adjusting characteristics according to driving conditions, reducing costs and overcoming limitations of existing technologies.
Implementation Method 1
an insulator mounted on the core and elastically deformed according to a load applied to the core
Implementation Method 2
a fluid transfer member for forcibly transferring a fluid, and operates according to driving conditions of a vehicle and selectively moves the fluid to the upper liquid chamber or the lower liquid chamber
Implementation Method 3
a motor installed at a lower portion of the lower plate to rotate the fluid transfer member, wherein the fluid transfer member may include a plurality of blades having a predetermined angle to generate a flow of fluid according to a direction of rotation by the motor
Implementation Method 4
when the fluid is moved from the upper liquid chamber to the lower liquid chamber, the rubber membrane may be spaced apart from the insulator, and the characteristic between the upper liquid chamber and the insulator may be changed from a fluid characteristic to a rubber characteristic
Implementation Method 5
an air hole may be formed on the case and the insulator so that the air is communicated between the insulator and the rubber membrane
Data Source
AI summary
Disclosed is an engine mount which includes a core installed in a case and supporting a load of an engine, an insulator mounted on the core and elastically deformed according to a load applied to the core, a diaphragm installed at a lower portion of the case, and an orifice assembly that divides a fluid-filled space between the insulator and the diaphragm into an upper liquid chamber and a lower liquid chamber and has at least one orifice for inducing a flow of fluid between the upper and lower liquid chambers, wherein the engine mount further includes a rubber membrane mounted between the orifice assembly and the insulator so as to be in close contact with a lower surface of the insulator, and wherein the orifice assembly includes a fluid transfer member for forcibly transferring a fluid, and operates according to driving conditions of a vehicle and selectively moves the fluid to the upper liquid chamber or the lower liquid chamber to regulate the liquid amount of the upper liquid chamber and the lower liquid chamber.