Two-part oil scraper ring axial stabilization
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Solution Overview
Problem
Existing oil scraper rings in engines face challenges in minimizing oil consumption and preventing oil from entering the combustion chamber, leading to increased emissions and wear due to high surface pressure and hydrodynamic friction.
Innovation Solution
A two-part oil scraper ring design featuring an L-shaped base body with an elastic axial stabilization element and a single scraping web, where the axial length of the bearing surface leg is between 15% and 75% of the overall height, and the radial length of the ring flank leg is between 20% and 100%, allowing for axial stabilization and efficient oil transport into the crankcase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the axial height of the bearing surface is reduced to create high surface pressure for efficient oil transport, then oil transport efficiency improves, but the ring becomes more prone to twisting and unstable positioning in the groove
Solution Approach 1:
The oil scraper ring is divided into two separate parts: a base body with the scraping web and an axial stabilization element. This segmentation allows the stabilization element to be specifically designed for axial positioning without compromising the scraping function, resolving the contradiction between compact height and stability.
Solution Approach 2:
The axial stabilization element acts as an intermediary component between the base body and the groove flanks. It mediates the interaction by providing axial stabilization through elastic contact with the groove flanks, enabling the base body to maintain its optimized low axial height while preventing ring twisting.
2Reliability
If spring force is increased to maintain contact pressure and prevent twisting, then contact pressure stability improves, but oil consumption increases due to higher friction and wear
Solution Approach 1:
By separating the stabilization function into a dedicated axial stabilization element, the system can use weaker springs that generate lower friction and wear on the cylinder wall, while still maintaining adequate contact pressure through the optimized L-shaped base body geometry.
Solution Approach 2:
The L-shaped cross-section with optimized leg length ratios (bearing surface leg: 15-75% of total height, ring flank leg: 20-100% of radial thickness) changes the mechanical parameters to achieve stable contact pressure distribution, reducing the spring force needed while maintaining reliability.
3Object-affected harmful factors
If the axial length of the bearing surface leg is increased to reduce surface pressure, then friction and wear decrease, but the ring becomes more susceptible to twisting and loses axial stability
Solution Approach 1:
The separation of the bearing surface leg and stabilization function into distinct components allows optimization of each for its specific function: the bearing surface leg can be designed with appropriate length to reduce friction, while the stabilization element independently provides axial stability.
4Device complexity
If a single-part ring design is used, then device complexity is reduced, but the ability to independently optimize stabilization and scraping functions is limited
Solution Approach 1:
The two-part design segments the ring into functionally optimized components: the base body for scraping and the axial stabilization element for positioning. This segmentation enables independent optimization of each function while maintaining relatively simple overall 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
This design reduces oil consumption and wear by maintaining continuous contact with the cylinder wall, using weaker springs for the same scraping effect, and compensating for twisting to ensure consistent contact pressure and efficient oil transport, thereby minimizing emissions and engine friction.
Implementation Method 1
the stabilization element is elastic in the axial direction
Implementation Method 2
maintaining continuous contact with the cylinder wall
Implementation Method 3
the tangential force, and thus the pressure with which the bearing surface bears on the cylinder wall, are obtained from a spring
Data Source
AI summary
The present invention relates to a two-part oil scraper ring, which comprises an L-shaped base body and an axial stabilization element. The L-shaped base body has a ring flank leg, which is pressed against a piston ring groove flank by the axial stabilization element, and a bearing surface leg, on which a scraping web is arranged. A twist compensation is attained by means of a suitable selection—and in particular variation—of hearing surface leg length, ring flank leg length and axial position of the scraping web.