Fluid-Filled Strut Mount With Tuned Orifice Passage
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Solution Overview
Problem
The reduction in engine cylinders or lockup engine speed leads to deteriorated vibration states in vehicles due to torque fluctuations, causing resonance and amplification of vibrations transmitted through the suspension and drive train to the vehicle body.
Innovation Solution
A fluid-filled strut mount with an orifice passage tuned to the frequency of vibrations during lockup, utilizing the flow action of non-compressible fluid to dampen vibrations, is interposed between the shock absorber and vehicle body, reducing vibration transmission and resonance effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the number of engine cylinders is decreased or lockup engine speed is reduced to enhance fuel economy, then fuel economy performance is improved, but vibration state of the vehicle body deteriorates due to torque fluctuations and resonance
Solution Approach 1:
The patent introduces a vibration damping device as an intermediary component between the drive train and the vehicle body. This device includes a mass element and a damping element that work together to absorb and dissipate vibration energy from torque fluctuations, preventing resonance amplification in the vehicle body while allowing the engine to operate at lower speeds or with fewer cylinders for improved fuel economy
Solution Approach 2:
The patent changes the physical parameters of the vibration transmission system by introducing a tuned mass damper with specific mass and damping characteristics. The damping element's viscosity and the mass element's weight are carefully selected to target specific vibration frequencies caused by reduced cylinder counts or lower lockup speeds, thereby controlling resonance effects while maintaining fuel economy benefits
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 solution effectively enhances vibration damping performance and quietness by attenuating vibrations during lockup, even with reduced engine cylinders or lower lockup engine speeds, preventing deterioration of the vehicle's vibration state and improving fuel economy.
Implementation Method 1
a fluid-filled zone whose interior is filled with a non-compressible fluid such that a vibration damping effect is obtained based on a flow action of the fluid
Implementation Method 2
a tuning frequency of the orifice passage is set to a frequency of a vibration transmitted during lockup of an automobile from a drive train of the automobile to the vehicle body via the shock absorber
Implementation Method 3
a main rubber elastic body elastically connecting the first and second mounting members to each other
Data Source
AI summary
A strut mount including: a first mounting member configured to be attached to a shock absorber; a second mounting member configured to be attached to a vehicle body; a main rubber elastic body elastically connecting the first and second mounting members to each other; a fluid-filled zone whose interior is filled with a non-compressible fluid such that a vibration damping effect is obtained based on a flow action of the fluid; and an orifice passage through which the fluid filled in the fluid-filled zone is induced to flow. A tuning frequency of the orifice passage is set to a frequency of a vibration transmitted during lockup of an automobile from a drive train of the automobile to the vehicle body via the shock absorber.