Variable Compression Connecting Rod Eccentric Lever Design
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Solution Overview
Problem
Internal combustion engines with fixed compression ratios face inefficiencies during partial load operations due to the inability to adjust compression ratios without causing engine knocking, limiting the potential for improved efficiency and reduced fuel consumption.
Innovation Solution
A connecting rod with an eccentric element adjustment arrangement that includes an eccentric element lever, fabricated using stamped and bent components or massive cold forming methods, allowing for variable compression ratios by adjusting the effective connecting rod length, thereby enhancing operational efficiency and reducing material weight and fabrication costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the compression ratio is increased to improve engine efficiency, then fuel efficiency improves, but engine knocking occurs during full load operations
Solution Approach 1:
The connecting rod incorporates an adjustable eccentric element that allows dynamic modification of the effective connecting rod length during operation. This enables the compression ratio to be varied between a first value (lower, preventing knocking during full load) and a second value (higher, improving fuel efficiency during partial load), transforming the static compression ratio into a dynamic parameter that adapts to operating conditions
2Adaptability or versatility
If a multi-component eccentrical element lever is used to enable variable compression adjustment, then adaptability improves, but device complexity and fabrication cost increase
Solution Approach 1:
The patent integrates multiple functional components into a single eccentrical element lever structure. The lever combines the eccentric element, adjustment lever, and support rod functions into one integrally configured component, eliminating the need for separate connecting bolts and multiple discrete parts. This merging reduces assembly complexity while maintaining the variable compression adjustment capability
Solution Approach 2:
The eccentrical element lever is designed as a multi-functional component that simultaneously performs multiple functions: it provides the eccentric adjustment mechanism, serves as a lever for actuation, supports the adjustment rod, and maintains structural integrity. This universal design reduces the overall number of components needed in the variable compression system
3Ease of manufacture
If traditional multi-component construction is used for the eccentrical element lever, then ease of manufacture improves, but material weight and fabrication cost increase
Solution Approach 1:
The patent consolidates multiple discrete components (eccentric element, lever arms, support structures) into a single integrally formed eccentrical element lever. This eliminates the need for connecting bolts and multiple fastening elements, reducing both the total material weight and the number of manufacturing steps while maintaining structural strength and adjustability functionality
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
The solution enables a cost-effective and reliable method for producing a connecting rod that supports variable compression ratios, improving engine efficiency and reducing the risk of fractures, while minimizing material usage and fabrication costs, thus enhancing the overall performance and fuel efficiency of internal combustion engines.
Implementation Method 1
the eccentrical element lever is integrally configured in one piece as a stamped and bent component or fabricated by a massive cold forming method
Data Source
AI summary
A connecting rod for an internal combustion engine with variable compression, the connecting rod including an eccentrical element adjustment arrangement configured to adjust an effective connecting rod length, wherein the eccentrical element adjustment arrangement includes an eccentrical element that cooperates with an eccentrical element lever and supports rods that engage the eccentrical element lever, and wherein the eccentrical element lever is integrally configured in one piece as a stamped and bent component or fabricated by a massive cold forming method.