Semi-Active Mount Plunger Valve Spring Segmentation
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Solution Overview
Problem
Conventional semi-active mounts face challenges in maintaining the second fluid passage closed during vehicle driving to prevent fluid flow, while requiring it to be open during idling for vibration attenuation, leading to inconsistencies in support and rigidity.
Innovation Solution
A semi-active mount structure incorporating a valve spring and a valve that seals the lower space of the valve spring when the second fluid passage is closed, increasing rigidity, and opens it when the passage is open, allowing air to be introduced or discharged, thereby decreasing rigidity and facilitating easier movement of the plunger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the plunger firmly supports the second fluid passage during vehicle driving to prevent fluid flow, then fluid containment is improved, but the plunger creates excessive support rigidity that prevents easy opening during idling
Solution Approach 1:
The support function is segmented into two independent systems: the valve spring provides firm support for fluid containment, while the weight mechanism provides gentle support for easy opening. This segmentation allows each component to optimize its function without compromising the other.
Solution Approach 2:
The weight acts as an intermediary element between the plunger and the valve spring, modulating the force transmission. During idling, the weight allows the plunger to move easily; during driving, the valve spring provides the necessary firm support while the weight prevents excessive rigidity.
2Reliability
If the valve spring rigidity is increased to maintain fluid containment during driving, then fluid containment is improved, but the coil capacity must be increased leading to larger size and higher current consumption
Solution Approach 1:
The support function is segmented between the valve spring (providing firm support for fluid containment) and the weight (providing gentle support that reduces coil burden). This allows the coil to operate with lower current while maintaining reliable fluid containment during driving.
Solution Approach 2:
The system changes the support rigidity parameter dynamically: during idling, the weight provides soft support allowing easy plunger movement; during driving, the valve spring provides firm support for fluid containment. This parameter change eliminates the need for high coil capacity.
3Reliability
If the valve spring lower space is sealed to function as an air spring, then valve spring rigidity is increased improving fluid containment, but the plunger becomes difficult to move during idling
Solution Approach 1:
The support function is segmented into the valve spring (sealed lower space for rigidity) and the weight (unsealed configuration for easy movement). This segmentation resolves the contradiction between maintaining fluid containment and enabling easy plunger movement during different operating conditions.
Solution Approach 2:
The system dynamically adjusts the lower space configuration: sealed during driving to maximize rigidity and fluid containment, unsealed during idling to minimize resistance and facilitate easy plunger movement. The weight mechanism enables this dynamic adaptation.
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 configuration enhances the semi-active mount's ability to maintain fluid containment during driving while reducing resistance and allowing for reduced coil capacity, smaller size, lower current consumption, and faster response times, while also simplifying manufacturing and reducing weight.
Implementation Method 1
a valve spring disposed between the plunger and the housing, to apply elastic force to the plunger
Implementation Method 2
The plunger is vertically moved in accordance with application of electric power to a coil thereof
Implementation Method 3
a certain amount of fluid (hydraulic fluid) is sealed in an interior of the hydraulic mount, to generate a damping force in accordance with flow thereof between an upper fluid chamber and a lower fluid chamber
Implementation Method 4
a valve, which is closed in a closed state of a second fluid passage such that a lower space of the valve spring is sealed to function as an air spring, thereby increasing rigidity of the valve spring
Data Source
AI summary
A semi-active mount structure may include a nozzle plate mounted between an insulator and a diaphragm, to divide an interior of a main case into an upper fluid chamber and a lower fluid chamber, the nozzle plate being formed with first and second fluid passages, a plunger mounted in a housing coupled to a lower surface of the diaphragm such that the plunger is vertically movable, the plunger opening or closing the second fluid passage in accordance with application of electric power to a coil, a valve spring disposed between the plunger and the housing, to apply elastic force to the plunger, the valve spring dividing a space defined between the diaphragm and the coil into an upper space and a lower space, and a valve mounted at a vent hole drilled at one side of the housing for air to be introduced into or discharged from the lower space.