Multi-Piece Oil Scraper Ring With Shaped Expander Spring
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Solution Overview
Problem
Conventional three-piece oil control rings in internal combustion engines experience high friction, leading to increased fuel consumption, which is not effectively mitigated by existing designs.
Innovation Solution
A multi-part piston ring configuration comprising an upper scraper ring, a lower support ring, and an expander spring/bending spring, where the expander spring is designed with unique cross-sectional shapes such as double-L, Z, or S-shaped, and SS-50 spring types, and the support ring is preloaded to ensure a closed joint with zero play, reducing friction by eliminating the need for the support ring to apply outward forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional three-part oil scraper ring is used with the support ring applying outward forces, then the ring can maintain contact with the cylinder wall for oil scraping, but friction increases leading to higher fuel consumption
Solution Approach 1:
The invention extracts and removes the lower support ring from the conventional three-part oil scraper ring assembly. By eliminating this component entirely, the patent removes the source of excessive friction while maintaining the essential oil scraping function through the upper wiper ring and expander spring combination alone.
Solution Approach 2:
The invention converts the harmful friction generated by the support ring's outward forces into a beneficial reduction in energy loss. By eliminating the support ring, the design allows the expander spring to directly apply controlled force to the wiper ring, reducing unnecessary friction while maintaining effective oil scraping contact with the cylinder wall.
2Reliability
If the support ring is designed to apply outward forces to maintain cylinder wall contact, then oil scraping effectiveness is improved, but the device complexity and number of components increases
Solution Approach 1:
The invention extracts and removes the lower support ring from the conventional three-part oil scraper ring assembly. By eliminating this component entirely, the patent simplifies the device structure while maintaining the essential oil scraping function through the upper wiper ring and expander spring combination alone.
Solution Approach 2:
The expander spring in the invention performs multiple functions: it provides expansion force to maintain the wiper ring's contact with the cylinder wall, replaces the support function previously performed by the removed support ring, and ensures reliable oil scraping effectiveness. This multi-functionality reduces the number of components needed.
3Stability of the object's composition
If the support ring is preloaded to ensure closed joint with zero play, then structural stability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention extracts and removes the lower support ring from the conventional three-part oil scraper ring assembly. By eliminating this component entirely, the patent eliminates the need for preloading and zero-play joint requirements, thereby reducing manufacturing precision demands while maintaining structural stability through the simplified two-component design.
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 significantly reduces friction, allowing for a lightweight and simple oil control ring with reduced contact with the cylinder wall, thereby lowering fuel consumption and enhancing engine efficiency.
Implementation Method 1
an expander spring (8), wherein the expander spring (8) is intended to bear against the lower flank surface (26) of the upper wiper ring (2) with one upper side and is intended to bear against the upper flank surface (44) of the lower support ring (4) with one lower side
Data Source
Figure 1A~1B
Figure 1C~2A
Figure 2B~2B'
AI summary
The invention relates to a multi-piece piston ring (10) comprising: a top oil scraper ring (2) with two flank faces (24, 26), an outer scraper face/edge (20) and an inner spring bearing face (22); a bottom support ring (4) with two flank faces (44, 46), an outer spring bearing face (40), and a support ring inner face (42); and an expander spring/bending spring (8), the top and bottom sides (80, 82) of which are intended to bear against a bottom flank face (26) of the top oil scraper ring (2) and against the top flank face (44) of the support ring (4), respectively; and oil scraper ring bearing projections (84) projecting upwards on an inner side of the spring and support ring bearing projections (86) projecting downwards on an outer side of the spring, wherein the oil scraper ring bearing projections (84) are intended to bear against the inner spring bearing face (22) of the oil scraper ring (2), and downward-projecting support ring bearing projections (86) are intended to bear against the outer spring bearing face (40).