Engine Mount Dynamic Damper Nesting in Subframe
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Solution Overview
Problem
Existing engine mount structures with active dynamic dampers positioned away from the engine mount fail to effectively absorb vibrations due to distance from the vibration input point, resulting in insufficient antivibration effects.
Innovation Solution
An engine mount structure with a dynamic damper positioned on the lower side of the mount device, connected to the subframe, which includes a hole portion for direct insertion and a first installation member connected to the subframe's upper surface, allowing efficient vibration absorption and transmission, while being elastically connected via a rubber bush to enhance vibration attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the dynamic damper is disposed at a position deviating from the engine mount (e.g., on the upper surface of the subframe), then the installation space is easier to access, but the distance from the vibration input point increases and sufficient antivibration effect cannot be produced
Solution Approach 1:
The dynamic damper is nested within the subframe structure by inserting it into a hole portion formed in the subframe. This allows the damper to be positioned at the optimal location (lower side of the mount device near the vibration input point) while utilizing the existing subframe geometry for installation, thus achieving both effective vibration absorption and ease of installation.
2Reliability
If the dynamic damper is positioned close to the vibration input point (lower side of the mount device), then vibration absorption efficiency is improved, but the installation space becomes more constrained
Solution Approach 1:
The dynamic damper is installed from the upper surface direction of the subframe through a hole portion, utilizing the vertical dimension for installation access. This allows the damper to be positioned at the lower side of the mount device (close to the vibration input point) while accessing it from above, thus achieving both optimal vibration absorption and installation ease through dimensional repositioning.
3Reliability
If the housing of the dynamic damper is inserted into the hole portion of the subframe, then the vibration absorption efficiency is improved, but the movement of the housing may be hindered
Solution Approach 1:
The subframe is designed with a hole portion that provides localized insertion space for the dynamic damper housing. The hole portion is positioned and dimensioned to allow the housing to move freely for vibration suppression while being constrained only in the insertion direction, thus achieving both effective vibration absorption and maintained movement freedom through localized structural design.
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 ensures efficient vibration absorption and transmission, improving the antivibration effect by positioning the dynamic damper at the vibration input point and maintaining effective movement and attenuation performance.
Implementation Method 1
the subframe and the mount device are elastically connected via a rubber bush
Implementation Method 2
the dynamic damper is inserted to the hole portion... the dynamic damper can efficiently absorb vibration of the subframe
Data Source
AI summary
An engine mount structure capable of efficiently absorbing vibration input from an engine is provided. The engine mount structure includes a front mount device 20 which is connected to an engine 1 and a subframe 10 to suppress vibration transmission from the engine 1 side to the subframe 10 side. A dynamic damper 26 connected to the subframe 10 to suppress vibration of the subframe 10 is disposed in a hole portion 11b, and an opening of the hole portion 11b is formed in an upper surface portion 11a of a front subframe member component 11 located on a lower side of the front mount device 20.