Precompressed Vibration Isolator for Power Train Roll Noise
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Solution Overview
Problem
Existing vibration isolators for power trains on vehicles fail to effectively reduce vibrations in the roll direction without transmitting them to the vehicle body, potentially causing noise and further vibration issues.
Innovation Solution
A vibration isolator design featuring a protrusion extending perpendicular to the principal axes of inertia with precompressed and contacting parts on opposing members, which compress and deform to absorb and dissipate vibrations, preventing their transmission to the vehicle body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulator rubbers are arranged with a gap from the side plates of the U-shaped member, then the vibration isolator can reduce the vibration of the power train in the roll direction, but the insulator rubbers collide with the side plates during vibration, transmitting impact to the vehicle body and generating noise
Solution Approach 1:
The insulator rubber is pre-compressed in the width direction before vibration occurs, creating initial contact between the rubber and the side plates. This preliminary compression ensures that during subsequent vibration in the roll direction, the rubber deforms elastically to absorb impact energy rather than colliding rigidly with the side plates, thereby preventing noise and impact transmission to the vehicle body
Solution Approach 2:
The invention changes the compression state parameter of the insulator rubber from uncompressed or lightly compressed to pre-compressed. This parameter change modifies the rubber's mechanical properties, making it more compliant and capable of absorbing vibration energy through elastic deformation, thus resolving the contradiction between vibration reduction effectiveness and collision noise prevention
2Object-generated harmful factors
If the insulator rubber is made compliant to prevent collision noise, then noise is reduced, but the vibration isolation performance may be compromised
Solution Approach 1:
The insulator rubber exhibits different mechanical properties in different directions: it is soft and compliant in the width direction (perpendicular to the side plates) to prevent collision noise, while maintaining sufficient stiffness in the vertical direction to provide effective vibration isolation. This local quality differentiation resolves the contradiction between noise reduction and vibration isolation performance
Solution Approach 2:
By pre-compressing the rubber in the width direction, the system prepares the rubber in an optimal state where it can deform elastically to absorb roll direction vibrations without colliding, while still maintaining enough structural integrity to isolate vertical vibrations effectively
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 solution effectively reduces vibration transmission in both the roll and vertical directions, minimizing noise and improving the isolator's performance in preventing vibration transfer, while maintaining a simple shape for easy integration and reduced spring constant for enhanced vibration isolation.
Implementation Method 1
a precompressed part provided on part of each of the opposing members facing the protrusion to be precompressed by the opposing member and the protrusion in the direction about the principal axes of inertia
Implementation Method 2
elastic bodies arranged on both sides of the protrusion in the roll direction are precompressed
Data Source
AI summary
A vibration isolator includes: a pair of opposing members fixed to a vehicle body of the vehicle to be located on both sides of a protrusion protruding from an outer circumferential edge of the power train in a direction perpendicular to the principal axes of inertia to oppose to each other in the direction about the principal axes of inertia; a precompressed part provided on part of each of the opposing members facing the protrusion to be precompressed by the opposing member and the protrusion in the direction about the principal axes of inertia; and a contacting part provided on part of each of the opposing members facing the protrusion to be spaced from the protrusion, and contacts the protrusion when the power train vibrates in the direction about the principal axes of inertia.