Eccentric Piston Pin With Orthogonal Cuts For Torque Generation
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Solution Overview
Problem
Conventional connecting rod and crank couplings in engines suffer from inefficiencies at top dead center, leading to stress on the driving shaft and reduced engine performance due to lack of torque, and require expensive and time-consuming modifications for precise eccentric coupling, which can result in strength and solidity issues if not done correctly.
Innovation Solution
A piston pin with orthogonal cuts forming three sectors, allowing for an eccentric connecting rod system, coupled with a stabilizing element to prevent the 'iron wire' effect, enabling a strong and balanced connection between the connecting rod, crank, and driving shaft with simplified production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional connecting rod and crank coupling is used, then the structure is simple, but no torque is generated at top dead center and the driving shaft is stressed
Solution Approach 1:
The piston pin is divided into three sectors by two orthogonal cuts: two external sectors connect to the crank-driving shaft and one internal sector connects to the connecting rod. This segmentation creates an eccentric coupling that generates torque at top dead center while maintaining structural integrity.
Solution Approach 2:
The piston pin features an asymmetric three-sector structure where the internal sector is offset from the external sectors, creating an eccentric connection between the connecting rod and crank. This asymmetry enables torque generation at top dead center by shifting the connecting rod's line of action away from the driving shaft axis.
2Power
If precise eccentric coupling modification is performed, then torque is generated at top dead center, but the work is expensive and time-consuming
Solution Approach 1:
The piston pin is pre-manufactured with the three-sector eccentric structure already integrated, eliminating the need for time-consuming field modifications. The orthogonal cuts and stabilizing element are created during standard manufacturing processes, allowing rapid installation in existing engines.
Solution Approach 2:
The piston pin design is self-contained with all eccentric coupling features built into a single replaceable component. The stabilizing element is automatically positioned during installation, and the component self-aligns to provide the required eccentricity without requiring precise external modifications.
3Volume of moving object
If the connection between connecting rod and crank is made small, then the structure is compact, but the 'iron wire' effect worsens and flexibility is reduced
Solution Approach 1:
The stabilizing element is nested within the piston pin's internal sector, creating a compact yet robust structure. The stabilizing element reinforces the connection without significantly increasing the overall volume, while preventing the harmful 'iron wire' effect by maintaining proper clearance and flexibility.
Data Source
AI summary
A piston pin carries out an eccentric coupling of connecting rod and crank connected with the driving shaft. The piston pin is shaped like a cylinder, has two cuts disposed orthogonally to the axis of the piston pin. The cuts form three sectors. The two external sectors correspond to the connection with the crank and the internal sector is coupled to the connecting rod.