Segmented Rubber Insulator for Engine Mount Vibration Damping
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Solution Overview
Problem
Conventional engine mounts with rubber insulators face increased vibration issues at natural frequencies due to limited damping value and stiffness adjustments, leading to resonance energy accumulation, which existing solutions fail to effectively mitigate.
Innovation Solution
A vibration damping device with a rubber insulator divided into multiple unit insulation bodies of varying natural frequencies, achieved through radial separation grooves and adjustable protrusions on the center core, allowing for distributed resonance energy reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the damping value of the rubber insulator is increased to reduce resonance energy, then the resonance energy is reduced, but the dynamic spring characteristics increase in proportion, causing large vibration in general use areas
Solution Approach 1:
The rubber insulator is divided into multiple unit insulation bodies with different natural frequencies through radial separation grooves. This segmentation allows the system to distribute resonance energy across multiple frequency peaks rather than concentrating it at a single frequency, thereby reducing the dynamic spring characteristics while still attenuating resonance energy effectively.
2Adaptability or versatility
If the stiffness of the rubber insulator is adjusted to change peak frequency, then the peak frequency is adjusted, but the stiffness is limited to a specific range required by the vibration damping system, making it difficult to achieve satisfactory results
Solution Approach 1:
Different unit insulation bodies are designed with different local stiffness characteristics through variations in their geometric parameters (such as different lengths or cross-sectional areas). This allows each unit to have a specific natural frequency tailored to distribute the resonance energy, achieving both peak frequency adjustment and reliable vibration damping performance within the required stiffness range.
3Object-affected harmful factors
If a separate dynamic vibration absorption device is installed to solve vibration increase at natural frequency, then the vibration increase is solved, but the installation cost and weight increase, and additional problems may occur in different frequency domains
Solution Approach 1:
The rubber insulator is designed to perform multiple functions: it provides mechanical support, isolates vibration, and distributes resonance energy through its segmented structure with multiple natural frequencies. This multi-functionality eliminates the need for separate dynamic vibration absorption devices, reducing installation cost and weight while avoiding additional problems in different frequency domains.
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 resonance energy by distributing natural frequencies among unit insulation bodies, thereby minimizing vibration increase at natural frequencies and enhancing damping performance.
Implementation Method 1
a rubber insulator 4 having a conical shape vulcanized and bonded to the center core 2 and to the cylindrical casing 3 is elastically transformed according to the vibration of the vehicle engine to attenuate the vibration
Implementation Method 2
the vibration damping device solves the problem of vibration increase which may occur in the natural frequency of a rubber insulator by allowing the rubber insulator to have a plurality of unit insulation bodies having different natural frequencies
Data Source
AI summary
Proposed is a vibration damping device for a vehicle as an engine mount for a vehicle, wherein the vibration damping device solves the problem of vibration increase which may occur in the natural frequency of a rubber insulator by allowing the rubber insulator to have a plurality of unit insulation bodies having different natural frequencies, wherein the vibration damping device for a vehicle includes a center core, and the rubber insulator having an insulation body provided between the center core and a cylindrical casing, wherein the insulation body includes a plurality of separation grooves formed therein to have shapes extending in radial directions such that the insulation body is divided into a plurality of unit insulation bodies along a circumferential direction of the insulation body.