Oil Scraper Ring With Long Crown Parts For Leakage Prevention
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Solution Overview
Problem
Existing oil scraper rings for piston rods in ship diesel engines are inefficient in scraping oil and prone to oil leakage, leading to operational issues and environmental concerns.
Innovation Solution
An oil scraper ring design with circumferentially extending passages and long crown parts that form a fluid connection between the end face and outer surface, preventing oil from escaping upward and allowing efficient scraping with minimal wear, using a scraper composed of harder materials for effective oil removal and a holding ring with a plastic end face for reduced pressure contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional oil scraper ring design is used, then the structure is simple, but the oil scraping efficiency is poor and oil can overcome the ring
Solution Approach 1:
The oil scraper ring is divided into multiple functional segments: a scraper portion with scraping edges for oil removal, a crown portion for structural support and oil redirection, and passages for fluid communication. This segmentation allows each part to perform its specific function optimally, improving overall scraping efficiency while maintaining manageable complexity through modular design
Solution Approach 2:
The invention introduces a longitudinal dimension to the traditionally two-dimensional ring structure by adding passages that extend through the ring thickness and a crown portion that protrudes axially. This three-dimensional structure creates multiple oil flow paths and scraping surfaces, significantly enhancing oil scraping efficiency by addressing the problem in multiple spatial dimensions simultaneously
2Reliability
If the scraper material is harder than the holding ring material, then the scraping edge is stable and sharp, but the contact pressure on the piston rod increases
Solution Approach 1:
The holding ring features localized plastic portions at specific contact positions with the piston rod, while the scraper material maintains its hardness for edge stability. This local modification of material properties allows the scraper edge to remain sharp and stable while the plastic portions reduce contact pressure and prevent excessive wear at critical contact points
Solution Approach 2:
The holding ring is constructed as a composite structure combining harder material for structural integrity and softer plastic material at contact surfaces. This composite approach allows the scraper to maintain a stable, sharp edge while the plastic portions cushion contact pressure on the piston rod, resolving the contradiction between edge stability and pressure reduction
3Reliability
If multiple oil scraper rings are arranged in a package, then the oil sealing is improved, but the complexity of the package assembly increases
Solution Approach 1:
Multiple oil scraper rings are arranged in a compact package assembly where they work together as an integrated system. The standardized design of individual rings with consistent crown portions and passage configurations allows them to be combined efficiently, improving oil sealing performance through multiple barriers while minimizing assembly complexity through design standardization
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 design ensures reliable and efficient oil scraping with reduced wear and prevents oil leakage, maintaining operational efficiency and environmental safety by ensuring oil is scraped effectively and does not escape the oil scraper ring package.
Implementation Method 1
oil scraped from the piston rod by the oil scraper rings cannot escape upwardly from the oil scraper ring package, and, thus can only escape following the gravitational force downwardly
Data Source
AI summary
The oil control ring (2) extends in a circumferential direction (2x) about a center (2l) and has a longitudinal axis (2m) that passes through the center (2l), wherein the oil control ring (2) has an end face (2d) that faces the center (2l), and wherein the oil control ring (2) has a first lateral surface (2s), a second lateral surface (2t), and an outer surface (2u) facing away from the center (2l), wherein the oil control ring (2) has a plurality of channels (2c) extending toward the center (2l) on the first lateral surface (2s), said channels being arranged at mutual distances in the circumferential direction (2x) and extending over the entire width of the first lateral surface (2s) in the radial direction and thereby forming a fluid-conducting connection between the end face (2d) and the outer surface (2u), and wherein crown parts (2i) extending in the circumferential direction (2x) are arranged between pairs of channels (2c), wherein each crown part (2i) protrudes beyond the respective channel (2c) in the direction of extent of the longitudinal axis (2m) and forms a lateral channel surface (2w) for the channel (2c), wherein at least one of the crown parts (5i) is designed as a long crown part (2p) and extends over an angular range (α) between 60 degrees and 350 degrees in the circumferential direction (2x). 212×2121.