Oil Scraper Ring Conical Cylindrical Edge Design
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Solution Overview
Problem
Existing oil scraper rings with conical or sharp-edged wiping edges achieve good oil scraping effects but result in increased wear on counter surfaces like cylinder liners, while those with wear-resistant coatings and cylindrical sections produce sharp stripping edges during production, also leading to excessive wear.
Innovation Solution
An oil scraper ring design featuring a conically cylindrical running surface with a rounded scraping edge of 0.02 to 0.2 mm radius, a flank angle ≤ 18°, and a reduced cylindrical section width of <0.15 mm, allowing for lower tangential force and friction loss, and enabling optimal protection of counter surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conical or sharp-edged wiping edge is used, then good oil scraping effect is achieved, but wear on counter surface increases
Solution Approach 1:
The patent applies different geometric characteristics to different parts of the scraper ring: the running surface has a conical shape with specific flank angle for effective oil scraping, while the wiping edge is rounded with a specific radius to reduce counter surface wear. This local differentiation of geometric properties resolves the contradiction between scraping effectiveness and wear prevention.
Solution Approach 2:
The patent specifies precise parameter ranges: wiping edge radius of 0.02 to 0.2 mm and flank angle of ≤18°. By optimizing these parameters, the invention achieves both effective oil scraping and reduced wear on the counter surface, transforming the harmful sharp edge into a controlled rounded geometry.
2Productivity
If a cylindrical section with wear-resistant coating is added, then oil scraping effect improves, but production complexity increases
Solution Approach 1:
The patent combines the conical running surface and cylindrical section into a single integrated geometry that can be produced in one pre-contour turning operation followed by coating and profile grinding. This merging of geometric features into a unified structure reduces production complexity while maintaining effective oil scraping.
3Loss of energy
If cylindrical section width is reduced, then friction loss decreases, but oil scraping effectiveness may be compromised
Solution Approach 1:
The patent specifies a precise width range for the cylindrical section (<0.15 mm) that optimizes the balance between friction reduction and oil scraping effectiveness. This parameter optimization ensures minimal friction loss while maintaining sufficient contact area for effective oil control.
Data Source
AI summary
The invention relates to an oil scraper ring, comprising a main body (2) having a radially outer running surface (3), a radially inner peripheral surface (6), and an upper (8) and a lower (7) flank, the ring having at least two running surface webs (4, 5), which, if necessary, are provided with a wear-resistant coating (15), the webs conically tapering at a predeterminable angle from the main body radially in the direction of the end (10) thereof facing a counter-running surface and forming limbs (11, 13), and the free end (10) of the running surface webs (4, 5) being configured at least partially obliquely extending from a region (O) on the oil chamber side in the direction of a region (8) on the combustion chamber side, wherein the respective transition regions are configured in a rounded manner, on the one side from the oblique region (12) of the running surface web (4, 5) to the limbs (11, 13) and on the other side from the limbs (11, 13) to the main body (2), wherein the oblique region (12) of the running surface web (4, 5) is in operative connection with a cylindrical portion (14) extending in the direction of the region (O) on the oil chamber side, the radius (R) of the scraper edge provided in the cylindrical portion (14) is 0.02 to 0.2 mm, and the flank angle is = 18° and the width of the respective cylindrical portion (14) is < 0.15 mm.