Composite Engine Cover Structure for Noise Insulation and Fastening Strength
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Solution Overview
Problem
Existing engine covers fail to provide adequate protection against foreign objects and noise leakage while maintaining structural integrity and heat management, with sound-absorbing materials lacking sufficient rigidity and strength.
Innovation Solution
A composite cover integrating a reinforcing body with a sound-absorbing main body, using insert molding to combine hard urethane and synthetic resin, with strategically placed fastening points to distribute load and enhance rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional engine cover is used without drainage holes, then the structural integrity and simplicity are maintained, but water accumulation occurs leading to rust and deterioration
Solution Approach 1:
The engine cover is segmented into multiple functional zones: a water collection area with drainage holes, a reinforcement rib structure, and a sealing area. The drainage holes are strategically positioned to divide and channel water flow to specific drainage paths, preventing water accumulation while maintaining structural integrity through the rib reinforcements.
Solution Approach 2:
Drainage holes are introduced as intermediary elements that mediate between the water accumulation problem and the engine cover structure. These holes allow controlled water passage while the surrounding reinforcement ribs act as intermediaries to maintain structural strength at the weakened areas where holes are created.
2Ease of operation
If drainage holes are added to the engine cover, then water drainage is improved, but structural strength is reduced at the hole locations
Solution Approach 1:
The engine cover employs local quality enhancement by adding reinforcement ribs specifically at and around the drainage hole locations. These localized reinforcements concentrate structural strength where it is most needed (at the hole perimeters) without adding ribs to the entire cover, thus maintaining overall structural integrity while enabling effective drainage.
Solution Approach 2:
The reinforcement ribs are pre-positioned around the drainage holes during manufacturing, providing structural support before water drainage issues can occur. This preliminary structural preparation ensures that the drainage holes do not become weak points in the engine cover structure.
3Strength
If the engine cover structure is reinforced to maintain strength with drainage holes, then structural integrity is maintained, but manufacturing complexity increases
Solution Approach 1:
The reinforcement ribs and drainage hole structures are merged into a single integrated engine cover component rather than being separate parts. This merging allows the ribs to be formed simultaneously with the cover body during injection molding, simplifying manufacturing by eliminating separate assembly steps while maintaining the structural benefits of the reinforcement ribs.
Solution Approach 2:
The reinforcement ribs serve multiple functions: they strengthen the engine cover structure, provide attachment points for seals or other components, and guide water flow toward drainage holes. This multi-functionality reduces the need for additional separate structural elements, simplifying the overall manufacturing process.
Data Source
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AI summary
The present invention addresses the problem of providing, in a state ensuring high strength, a cover responsible for the protection and noise insulation of a crank pulley, auxiliary drive belt, etc., in a longitudinal engine in which a crankshaft is disposed facing toward the front of the vehicle body. This cover 30 includes a sound absorbing body 33 made of a material such as hard urethane, and a hard reinforcing body 34 in which the sound absorbing body is insert-molded, the cover being formed in a tray shape as a whole. Fastening parts 35-38 fixed to the engine by bolts are provided to outer ends of the reinforcing body 34. Since the pressing force from the bolts does not directly affect the sound absorbing body 33, high fastening strength can be achieved while ensuring a high protection function and sound insulation function.