Variable Compression Ratio Stopper Load Distribution
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Solution Overview
Problem
Existing internal combustion engine variable compression ratio mechanisms face issues with uneven load distribution due to stopper member abutment positions close to the control shaft rotation center, leading to increased stress on both stopper members.
Innovation Solution
The mechanism incorporates body-side and control-shaft-side stoppers with strategically positioned stopper surfaces that maintain a longer distance from the control shaft rotation center, preventing one-sided abutment and reducing load concentrations by ensuring surface contact is farther from the center, thus distributing loads more evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the stopper surfaces are positioned close to the control shaft rotation center, then the stopper members can be made smaller and lighter, but the load concentration increases significantly
Solution Approach 1:
The patent transitions from radial positioning (distance from rotation center) to axial positioning (distance along the shaft axis) for the stopper surfaces. By locating stopper surfaces at positions farther along the axial direction from the rotation center, the design achieves better load distribution without compromising the compactness of the stopper members.
2Device complexity
If the stopper surfaces are positioned close to the control shaft rotation center, then the structure becomes more compact, but the load distribution becomes uneven
Solution Approach 1:
The patent resolves the contradiction by moving the stopper surfaces along the axial dimension rather than reducing the radial distance to the rotation center. This axial displacement maintains structural compactness while achieving uniform load distribution through proper positioning of the stopper surfaces at optimized axial locations.
3Weight of moving object
If the stopper members are made with minimal size and thickness, then the weight is reduced, but the strength may be compromised
Solution Approach 1:
The patent optimizes the axial position parameter of the stopper surfaces to achieve favorable load distribution. This parameter change allows the stopper members to be designed with minimal necessary sizes and thicknesses while maintaining adequate strength, as the optimized positioning reduces peak load concentrations that would otherwise require oversizing the components.
Data Source
AI summary
When a stopper portion is brought into abutment against body high-compression-ratio side stopper portion, when viewed in the control shaft axial direction, it is configured that the distance between body high-compression-ratio side stopper surface and control-shaft high-compression-ratio side stopper surface becomes relatively longer as being closer to the control shaft rotation center. Similarly, when a stopper portion is brought into abutment against body low-compression-ratio side stopper portion, when viewed in the control shaft axial direction, the distance between body low-compression-ratio side stopper surface and control-shaft, low-compression-ratio side stopper surface becomes relatively longer as being closer to the control shaft rotation center.