Engine Mount Structure with Central Elastic Support for Vibration Damping
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Solution Overview
Problem
Existing engine unit support structures face a trade-off between vibration damping performance and durability, as using elastic support bodies with small spring constant prioritizes vibration damping but compromises durability, while those with large spring constant prioritize durability at the expense of vibration damping.
Innovation Solution
The engine unit support structure employs a first elastic support body under the engine's lower surface closest to the rotation center and multiple second elastic support bodies positioned peripherally, with the first support body within a closed space defined by the second support bodies' centers, allowing for reduced load sharing and the use of smaller spring constant rubber for improved damping while enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastic support bodies with small spring constant are used to prioritize vibration damping performance, then vibration damping performance is improved, but durability deteriorates due to large deformation
Solution Approach 1:
The support structure is segmented into two functional groups: first elastic support bodies positioned near the rotation center that bear the majority of the load, and second elastic support bodies positioned peripherally that provide vibration damping. This segmentation allows each group to be optimized for its specific function, resolving the contradiction between durability and vibration damping performance
Solution Approach 2:
Different regions of the support structure are assigned different qualities: the first elastic support bodies near the rotation center use rubber with larger spring constant for durability and load bearing, while the second elastic support bodies at peripheral positions use rubber with smaller spring constant for vibration damping. This local differentiation allows simultaneous optimization of both durability and vibration damping
2Strength
If elastic support bodies with large spring constant are used to prioritize durability, then durability is improved, but vibration damping performance deteriorates
Solution Approach 1:
The support structure divides elastic support bodies into two segments with different spring constants: first elastic support bodies with larger spring constant for durability near the rotation center, and second elastic support bodies with smaller spring constant for vibration damping at peripheral positions. This segmentation resolves the contradiction by assigning different functional priorities to different segments
Solution Approach 2:
The patent applies local quality by specifying that first elastic support bodies use rubber with larger spring constant in regions requiring durability, while second elastic support bodies use rubber with smaller spring constant in regions requiring vibration damping. This localized property assignment simultaneously achieves both durability and vibration damping performance
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 achieves both excellent vibration damping performance and improved durability by equalizing load sharing among the second elastic support bodies and utilizing a first support body with a higher spring constant in the vertical direction.
Implementation Method 1
a plurality of elastic support bodies coupled to the engine unit and the mounting base and thereby supporting the engine unit
Implementation Method 2
a spring constant of the first elastic support body in a vertical direction is greater than a spring constant of the first elastic support body in a direction intersecting with the vertical direction
Data Source
Figure 1A~1C
Figure 2A~2C
Figure 3A~3B
AI summary
To provide an engine unit support structure with excellent vibration damping performance and durability, the engine unit support structure (1) is provided with an engine unit (2) having an engine (22), a mounting base (3) for mounting the engine unit (2) thereon, and a plurality of elastic support bodies coupled to the engine unit (2) and the mounting base (3) to thereby support the engine unit (2), in which the plurality of elastic support bodies include a first elastic support body (4A) disposed under the lower surface (20) of the engine unit (2) in a position closest, than any other of the plurality of the elastic support bodies, to the rotation center of the output shaft of the engine (22) and three or more of second elastic support bodies (4B, 4B, ...), and the first elastic support body (4A) is disposed within a closed space X in plan view formed by interconnecting the centers of the neighboring second elastic support bodies (4B, 4B, ...).