Piston Ring Stopper Structure to Prevent Blowby and Ring Rotation
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Solution Overview
Problem
Piston rings in internal combustion engines face issues with rotational movement causing friction and reducing lubrication, leading to unwanted blowby gases and leakage due to aligned installation gaps, which impede their sealing and heat dissipation functions.
Innovation Solution
Incorporating stoppers on each piston ring that protrude from the main body and are offset from the installation gaps, these stoppers engage with recesses on the piston to prevent rotational movement, maintaining alignment and enhancing sealing and lubrication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If piston rings are provided without stoppers, then the device complexity is reduced, but rotational movement occurs causing friction and reducing lubrication
Solution Approach 1:
The piston ring is segmented into a main body and a separate stopper component. The stopper is provided as a distinct element that can be attached to the piston ring, allowing the sealing function and anti-rotation function to be separated. This segmentation enables the main body to focus on sealing while the stopper prevents rotational movement, resolving the contradiction between simplicity and reliability.
Solution Approach 2:
The stopper is nested within or attached to the piston ring structure, forming an integrated anti-rotation mechanism. The stopper fits into a groove or slot in the piston ring, creating a nested configuration that prevents rotational movement without significantly increasing the overall size or complexity of the piston ring assembly.
2Reliability
If stoppers are added to piston rings, then rotational movement is prevented and lubrication is improved, but device complexity increases
Solution Approach 1:
The anti-rotation function is extracted from the main piston ring body and implemented through a separate stopper component. This extraction allows the piston ring main body to remain simple and focused on sealing, while the stopper handles the anti-rotation function. The stopper can be a simple pin or block that fits into a corresponding groove, minimizing the increase in device complexity.
3Ease of manufacture
If installation gaps are aligned, then manufacturing is easier, but blowby gases leak through aligned gaps reducing sealing efficiency
Solution Approach 1:
The stopper creates an asymmetric configuration in the piston ring assembly. By positioning the stopper at a specific location on the piston ring and providing a corresponding asymmetric groove or slot in the piston, the system prevents rotational movement that would otherwise allow aligned installation gaps. This asymmetric arrangement ensures that even if gaps are initially aligned during manufacturing, the stopper prevents the ring from rotating to a position where gaps would align and allow blowby gas leakage.
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 stoppers effectively prevent rotational movement of piston rings, reducing friction and maintaining lubrication, thereby improving the sealing efficiency and heat dissipation, minimizing blowby gases and ensuring effective operation of the internal combustion engine.
Implementation Method 1
Piston rings in internal combustion engines face issues with rotational movement causing friction and reducing lubrication
Implementation Method 2
Piston rings can release heat build-up by dissipating the heat to the cylinder
Data Source
AI summary
An internal combustion engine includes a combustion chamber, a piston a plurality of piston rings. The combustion chamber has a bore wall. The piston is configured to move relative to the bore wall. The plurality of piston rings is provided to the piston. Each of the piston rings has a main body that is circular. Each of the pistons rings further has a stopper that protrudes from the main body.