Connecting Rod Eccentric Adjustment Groove Wear Reduction
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Solution Overview
Problem
In internal combustion engines, the uneven loads on the crank bearing eye and bearing shell lead to increased wear due to the fixed compression ratio, which is not optimally adjustable for varying operating conditions.
Innovation Solution
A connecting rod with an eccentrical element adjustment device that includes two cylinders with pistons and hydraulic fluid supply grooves arranged to support the highly loaded portions of the crank bearing eye, ensuring reliable lubrication and reducing wear by maintaining hydraulic fluid flow even under unfavorable positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hydraulic fluid supply grooves are arranged in the crank bearing eye to supply cylinders for eccentrical element adjustment, then the compression ratio can be variably adjusted, but the highly loaded portions of the bearing eye experience increased wear due to groove placement
Solution Approach 1:
The patent applies local quality by differentiating the functional zones within the crank bearing eye. The groove arrangement is specifically designed to avoid highly loaded portions, creating distinct regions: one for hydraulic fluid supply (less loaded areas) and another for bearing support (highly loaded areas). This spatial differentiation of functions reduces wear in critical bearing zones while maintaining variable compression capability.
Solution Approach 2:
The crank bearing eye is segmented into functionally distinct zones through strategic groove placement. The grooves are positioned in less loaded portions while leaving highly loaded portions intact for bearing support. This segmentation allows simultaneous fulfillment of hydraulic supply and mechanical support functions without compromising either.
2Adaptability or versatility
If grooves are positioned to supply hydraulic fluid to cylinders, then eccentrical element adjustment is enabled, but fluid connection may be lost in unfavorable positions of the connecting rod
Solution Approach 1:
The patent implements preliminary action by pre-positioning multiple grooves in strategically located less loaded portions of the crank bearing eye. This ensures that at least one groove maintains reliable hydraulic connection regardless of the connecting rod's position. The grooves are arranged in advance to account for all possible operational positions, preventing fluid connection loss before it occurs.
Solution Approach 2:
The patent utilizes parameter changes by varying the angular positions and orientations of multiple grooves within the crank bearing eye. By distributing grooves across different angular positions in less loaded areas, the system ensures that hydraulic fluid supply parameters remain stable across all operational positions of the connecting rod, compensating for position-dependent load variations.
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 effectively reduces wear on the connecting rod by ensuring consistent hydraulic fluid supply to the eccentrical element adjustment device, enhancing the operational reliability and longevity of the engine by distributing loads more evenly and maintaining fluid connection between the cylinders.
Implementation Method 1
the connecting rod body includes at least two connecting rod body grooves for connecting each respective inlet with a hydraulic fluid loop
Implementation Method 2
A lubrication oil film can build up between the crank bearing eye and the crank pin
Data Source
AI summary
A connecting rod for an internal combustion engine with variable compression with an eccentrical element adjustment device for adjusting an effective connecting rod length, the connecting rod including a connecting rod body; and a connecting rod cover arranged at the connecting rod body, wherein the connecting rod body and the connecting rod cover envelop a crank bearing eye, wherein the eccentrical element adjustment device includes two cylinders with a respective piston that is displaceably supported in a respective cylinder bore hole and connected with a respective support rod, wherein a respective inlet is provided for supplying hydraulic fluid to each of the two cylinders, wherein a respective outlet is provided for draining the hydraulic fluid from each of the two cylinders, wherein the connecting rod body includes at least two connecting rod body grooves for connecting each respective inlet with a hydraulic fluid loop, wherein the at least two connecting rod body grooves are arranged so that a highly loaded portion of the connecting rod bearing eye is not provided with the at least two connecting rod body grooves.