Vehicle Casing Vibration Isolation via Boss Separation
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Solution Overview
Problem
Existing vehicle casings, such as transmission case rear covers, often transmit vibration noise from vehicle components to resin covers due to close contact between metal frames and resin surfaces, leading to noise radiation into the vehicle.
Innovation Solution
The vehicle casing design features a metal frame with a bearing supporting boss portion positioned separate from the resin cover's inner surface, using arm portions to support the shaft member and mount boss, allowing for a hollow section that reduces size and weight, and preventing vibration transmission to the resin cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the bearing supporting boss portion is in close contact with the resin cover to reduce the number of parts and simplify assembly, then device complexity is reduced, but vibration sound is transmitted from vehicle components to the resin cover causing noise radiation
Solution Approach 1:
The patent introduces an intermediary element (metal frame or damping material) between the bearing supporting boss portion and the resin cover to block the vibration transmission path. This intermediary absorbs or isolates vibrations, preventing them from reaching the resin cover while still allowing structural support and assembly simplicity to be maintained.
2Strength
If a metal frame is used to support bearing and shaft member to ensure strength, then strength is improved, but weight increases compared to using only resin
Solution Approach 1:
The patent employs a composite structure combining metal frame and resin cover, where the metal frame provides necessary strength and rigidity for bearing support, while the resin cover reduces overall weight and provides noise insulation. This composite approach optimizes the strength-to-weight ratio by strategically using materials based on their respective advantages.
3Stability of the object's composition
If the metal frame is made solid to ensure structural rigidity, then rigidity is improved, but volume and weight increase
Solution Approach 1:
The metal frame is designed with non-uniform thickness, featuring thicker sections at critical load-bearing areas (such as bearing supporting boss portions and connection points) and thinner sections in non-critical areas. This local quality variation maintains structural rigidity where needed while minimizing overall volume and weight.
4Volume of moving object
If the bearing supporting boss portion is positioned close to the resin cover to reduce size, then compactness is improved, but vibration transmission to the resin cover occurs causing noise radiation
Solution Approach 1:
The patent introduces an intermediary element (metal frame or damping material) between the bearing supporting boss portion and the resin cover to block the vibration transmission path. This intermediary absorbs or isolates vibrations, preventing them from reaching the resin cover while still allowing structural support and assembly simplicity to be maintained.
Data Source
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AI summary
A vehicle casing includes a metal frame (10; 40) and a resin cover (20; 50) that covers the metal frame (10; 40). The metal frame (10; 40) is configured such that vehicle components are accommodated inside the metal frame (10; 40). The vehicle components include a shaft member (31; 71) configured to rotate about a shaft center. The metal frame (10; 40) is provided with a bearing supporting boss portion (13, 16; 43) configured to support the shaft member (31; 71) such that the shaft member (31; 71) rotates with respect to the metal frame (10; 40). The bearing supporting boss portion (13, 16; 43) is disposed to be separate from an inner surface of the resin cover (20; 50) inside the resin cover (20; 50).