Length-Adjustable Connecting Rod With Integrated Oil Filtration
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Solution Overview
Problem
Conventional length-adjustable connecting rods for internal combustion engines face challenges with high pressure differences, small installation space, and contamination of engine oil, leading to wear and failure of hydraulic adjustment mechanisms and sealing devices.
Innovation Solution
Incorporating an oil filter into the hydraulic adjustment mechanism to clean engine oil before it enters the cylinder-piston assembly, preventing the introduction of contaminants like soot particles and swarf, and using a two-way adjustable piston with oil filters in both pressure spaces to maintain efficient operation under extreme pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If engine oil is supplied to the hydraulic adjustment mechanism without filtration, then the adjustment mechanism can operate with simple structure, but contaminants like soot particles and swarf cause wear and failure of sealing devices
Solution Approach 1:
The patent applies preliminary action by filtering the engine oil before it enters the hydraulic adjustment mechanism. Oil filters are integrated into the oil supply channels upstream of the cylinder-piston assembly, removing contaminants like soot particles and swarf before they can cause wear to sealing devices and hydraulic components. This preventive filtration approach ensures reliable operation while maintaining relatively simple device structure.
2Reliability
If oil filters are integrated into the hydraulic adjustment mechanism, then wear of sealing devices is prevented, but the device complexity increases
Solution Approach 1:
The patent merges the oil filtration function with the hydraulic adjustment mechanism by integrating oil filters directly into the oil supply channels of the cylinder-piston assembly. This combination allows the filters to be positioned at the most critical location where they can protect sealing devices from contaminants, while sharing the same structural space as the hydraulic system, thereby minimizing additional complexity.
3Reliability
If two-way adjustable piston with oil filters in both pressure spaces is used, then wear is reduced and operation is maintained under extreme pressures, but the device complexity increases
Solution Approach 1:
The patent applies local quality by providing oil filters in both pressure spaces of the cylinder-piston assembly. Each pressure space receives filtered oil through dedicated filters positioned upstream, ensuring that both sides of the adjustable piston are protected from contaminants. This localized filtration approach addresses the specific high-pressure operating conditions in each chamber while maintaining symmetric and manageable device structure.
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 enhances the permanent operability of the connecting rod by reducing wear and preventing damage to sealing devices, ensuring reliable operation and improved fuel efficiency by maintaining the variable compression ratio.
Implementation Method 1
the hydraulic adjustment mechanism comprises at least one oil filter for filtering the engine oil of the internal combustion engine flowing into the cylinder-piston assembly
Implementation Method 2
the cylinder-piston assembly can be actuated by way of a hydraulic adjustment mechanism
Data Source
AI summary
A length-adjustable connecting rod for an internal combustion engine, comprises a first connecting rod member, a second connecting rod member and at least one cylinder-piston assembly for adjusting the first connecting rod member relative to the second connecting rod member. The cylinder-piston assembly can be actuated by way of a hydraulic adjustment mechanism, where the hydraulic adjustment mechanism comprises at least one oil filter in order to filter the engine oil of the internal combustion engine flowing into the cylinder-piston assembly. The invention further relates to an internal combustion engine with such a length-adjustable connecting rod and the use of such a cylinder-piston assembly for a length-adjustable connecting rod of an internal combustion engine.