Segmented Oil Scraper Ring With Inclined Drain Grooves
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Solution Overview
Problem
Conventional oil scraper rings for piston rods in large 2-cycle diesel engines are inefficient in reducing oil consumption, as they do not effectively manage the discharge of system oil, leading to excessive drain and increased operational costs.
Innovation Solution
The oil scraper ring design features inclined oil drain grooves on both upper and lower surfaces, with the grooves' cross-sectional area increasing from the inner to the outer side, and strategically placed pins and pin-receiving holes to enhance followability and vertical balance, allowing for improved oil scraping performance and reduced drain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional oil scraper rings with horizontal oil drain slots are used, then the structure is simple and easy to manufacture, but the oil discharge efficiency is poor leading to excessive oil consumption
Solution Approach 1:
The ring body is circumferentially divided into at least two segments with oil drain grooves provided on both upper and lower surfaces. This segmentation allows oil to be discharged from multiple locations and directions, significantly improving oil discharge efficiency while maintaining reasonable structural complexity
Solution Approach 2:
The invention transitions from horizontal oil drain slots (single plane) to inclined oil drain grooves on both upper and lower surfaces (multiple planes/dimensions). The grooves extend from the inner peripheral side toward the outer peripheral side with an inclination, creating a three-dimensional oil discharge path that enhances gravitational drainage effectiveness
2Reliability
If the ring body is circumferentially divided to improve followability, then the oil scraping performance improves, but the manufacturing precision requirements increase
Solution Approach 1:
The ring body is divided circumferentially into multiple segments that can flexibly follow the piston rod surface. The segmentation is designed with reasonable proportions and connection features that balance followability improvement with manufacturing feasibility, avoiding excessive precision requirements
Solution Approach 2:
The segmented ring body structure allows dynamic adaptation to the piston rod surface during operation. The segments can move relative to each other to maintain contact with the rod surface, improving followability without requiring the entire ring to be manufactured with ultra-high precision as a single piece
3Loss of substance
If oil drain grooves are provided only on the upper surface, then the structure is simpler, but the vertical balance and oil discharge efficiency are insufficient
Solution Approach 1:
Oil drain grooves are provided on both upper and lower surfaces of the ring body, segmenting the oil discharge paths into multiple channels. This multi-surface groove configuration allows oil to drain from different locations simultaneously, significantly improving overall discharge efficiency while the groove patterns on each surface remain manageable in complexity
Solution Approach 2:
The invention adds the lower surface dimension to the groove configuration, transitioning from single-surface to multi-surface oil drainage. The inclined grooves on both surfaces create a three-dimensional drainage network that leverages gravity more effectively, improving oil discharge without requiring excessively complex groove patterns
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 oil consumption by facilitating easier discharge of oil through combined oil drain grooves, maintaining rigidity, and ensuring excellent followability, resulting in a substantial reduction in the amount of drain over time.
Implementation Method 1
an annular coil spring for pressing the rail to an outer peripheral surface of the piston rod
Implementation Method 2
inclined oil drain grooves on both upper and lower surfaces, with the grooves' cross-sectional area increasing from the inner to the outer side
Data Source
Figure 1
Figure 2(a)~2(c)
Figure 3(a)~3(c)
AI summary
To provide an oil scraper ring for a piston rod having excellent oil-scraping performance to reduce the amount of drain, and a stuffing box comprising such oil scraper rings, a ring body of the oil scraper ring is circumferentially divided to at least two, the ring body comprising a rail at an inner-side longitudinal center, a coil spring groove at an outer-side longitudinal center, and pluralities of oil drain grooves at least one of upper and lower surfaces, which are inclined such that their cross section areas increase as going from the inner side to the outer side.