Oil Scraper Ring Conical Tread Web Geometry
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Solution Overview
Problem
Existing oil scraper rings for internal combustion engines do not consistently achieve effective oil scraping behavior over their service life, leading to inefficient oil consumption and potential damage to engine components.
Innovation Solution
An oil scraper ring with a geometric contour and a wear-resistant layer, featuring identical tread webs that transition from a conical shape to a beveled area, ensuring line contact and reduced edge sharpness, which minimizes wear and optimizes oil wiping behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the running surface web has a geometric contour with line contact at the beginning of engine operation, then good wiping behavior in the running-in state is achieved, but high surface pressure is generated
Solution Approach 1:
The running surface web is designed with a specific geometric contour featuring curved transition areas with defined radii (a, b, c, d) instead of sharp edges. The conical legs and beveled areas create a progressive contact surface that distributes pressure while maintaining effective wiping action during the running-in period.
Solution Approach 2:
The geometric contour is designed to create line contact at the beginning of engine operation, establishing good wiping behavior in advance during the running-in state before full operational wear occurs. This preliminary configuration ensures optimal performance from the start of engine operation.
2Ease of operation
If the running surface web has sharp edges at the free end, then initial contact is established, but damage to the counter surface especially to cylinder liners occurs
Solution Approach 1:
All sharp edges are replaced with curved transition areas having specific radii (a, b, c, d). The free end features a transition area with radius b that connects the conical leg to the beveled area, eliminating sharp edges that could damage the cylinder liner while maintaining effective contact.
Solution Approach 2:
The design converts what would be harmful sharp edges into beneficial curved surfaces. The transition areas with radii create progressive contact that establishes initial contact effectively while preventing damage to the counter surface, turning a potential harm into a protective feature.
3Ease of manufacture
If the oil scraper ring uses conventional geometric structures, then manufacturing is simpler, but oil consumption is not minimized effectively
Solution Approach 1:
The conical legs with specific cone angles (e, f) and the beveled area with angle g create an optimized geometric contour that minimizes oil consumption. This specific curved geometry, while requiring precise manufacturing, provides superior oil scraping efficiency compared to conventional flat or simple rounded designs.
Solution Approach 2:
The design specifies precise geometric parameters including cone angles (e, f), beveled area angle (g), and transition radii (a, b, c, d) to optimize oil scraping performance. By carefully controlling these parameters, the ring achieves minimal oil consumption while maintaining manufacturability through defined geometric features.
4Reliability
If the contact area is wide initially, then better oil scraping is achieved, but the contact area does not remain narrow over time
Solution Approach 1:
The geometric contour with multiple curved transition areas and conical legs is designed to maintain a relatively narrow contact area even after longer periods of operation. The specific radii and angles create a self-adjusting contact surface that stabilizes the contact area width over time while maintaining effective oil scraping.
Solution Approach 2:
The running surface web is pre-configured with a geometric contour that anticipates wear patterns, ensuring the contact area remains relatively narrow even after longer periods of time. This preliminary geometric design compensates for expected wear and maintains stable contact characteristics throughout the service life.
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 enhances oil scraping efficiency, reduces wear on engine components, and maintains a narrow contact area over time, thereby minimizing oil consumption and operational costs.
Implementation Method 1
a geometric contour which, if necessary, is provided with a wear-resistant layer, such as in particular a chromium layer
Implementation Method 2
Line contact of the running surface web(s) at the beginning of engine operation, therefore high surface pressure and good wiping behavior in the running-in state
Data Source
Figure 1
AI summary
Oil scraper ring comprising a base body (2) with a radially outer running surface (3), an inner circumferential surface (6), and an upper (7) and a lower flank (8), which has at least two running surface ribs (4, 5) optionally provided with a wear-resistant layer, which taper conically radially towards their end (10) facing a counter-running surface, starting from the base body (2), at a predetermined angle (e, f), forming legs (11, 13), wherein the respective transition areas (b, c, d), on the one hand from the chamfered area (12) of the running surface rib (4, 5) into the legs (11, 13) and on the other hand from the legs (11, 13) into the base body (2), are rounded, i.e.are provided with defined radii, characterized in that the free end (10) of the running surface ribs (4, 5), starting from an oil chamber-side area (0) in the direction of a combustion chamber-side area (B), is chamfered (12) such that the leg (11) of the running surface rib (4, 5) facing the oil chamber (0), starting from the base body (2), extends towards the free end (10) of the running surface rib (4, 5) at an angle (e) of 0.5 to 15° and the leg (13) of the running surface rib (4, 5) facing the combustion chamber (B), starting from the base body (2), extends towards the free end (10) of the running surface rib (4, 5) at an angle (f) of 0.55 to 15°, wherein the oil chamber-side transition area from the conically extending leg (11) into the chamfered area ( 12) has a radius (b) between 0.05 and 0.20 mm.