Multi-piece Oil Ring Jutting Portion Grinding
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Solution Overview
Problem
Existing multi-piece oil rings face issues with increased oil consumption and friction over time due to worn-out elevations on sliding section protuberances, and their manufacturing methods lack precision in forming these elevations.
Innovation Solution
A multi-piece oil ring design featuring rails with individually ground sliding section protuberances, where the axial length of jutting portions ranges from 0.02 to 0.18 mm, and a change rate of 0 to 80% from the sliding surface to 0.03 mm radially, with optional nitriding treatment and PVD or DLC coatings to enhance precision and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If elevations are formed at the tip of sliding section protuberances by polishing, then oil consumption is reduced initially, but the effect degrades over time due to wear
Solution Approach 1:
The patent applies preliminary action by pre-forming elevations at the tip of sliding section protuberances through selective polishing before the oil ring is installed. This preliminary shaping creates optimal initial contact conditions with the cylinder wall, ensuring low oil consumption from the start. The elevations are positioned and sized in advance to compensate for anticipated wear, maintaining performance stability over the oil ring's service life.
2Ease of manufacture
If the entirety of the sliding section protuberance is shaped by polishing, then manufacturing is simplified, but precision in forming elevations cannot be achieved
Solution Approach 1:
The patent applies local quality by selectively polishing only specific regions of the sliding section protuberance rather than the entire surface. The elevations are formed at predetermined locations at the tip of the protuberance through targeted polishing operations. This localized approach ensures precise elevation formation while maintaining relative manufacturing simplicity, as the polishing is confined to specific zones rather than requiring complete surface treatment.
3Object-generated harmful factors
If jutting portions with specific axial length are formed by grinding, then friction and oil consumption are reduced, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the axial length of jutting portions within the range of 0.02 to 0.18 mm through grinding operations. This specific parameter range optimizes the balance between friction reduction and manufacturing feasibility. The controlled axial length ensures that the jutting portions effectively reduce friction and oil consumption while maintaining a manufacturing process that, although more complex than simple polishing, remains practical for production.
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 reduces friction and oil consumption while maintaining performance over long use, improves processing precision, and simplifies fitting by maintaining a symmetrical configuration, with enhanced wear resistance and sliding properties.
Implementation Method 1
a coil expander which is placed in an inner circumferential groove formed on the inner circumferential surface of the columnar part of the oil ring main member, and which applies force to the oil ring main member in such a way as to press the same outwardly in the radial direction
Implementation Method 2
the tip of which possesses a jutting portion formed by grinding a portion of the tip of the sliding section protuberance; reduces friction and oil consumption while maintaining performance over long use
Implementation Method 3
with optional nitriding treatment and PVD or DLC coatings to enhance precision and wear resistance
Implementation Method 4
with optional nitriding treatment and PVD or DLC coatings to enhance precision and wear resistance
Data Source
AI summary
A multi-piece oil ring includes an oil ring main member in which two rails are connected together by a columnar part and which has a roughly I-shaped cross section; and a coil expander disposed in an inner circumferential groove formed on the inner circumferential surface of the columnar. Each rail in the oil ring main member possesses a sliding section protuberance whose tip possesses a jutting portion. The axial length of the jutting portion is 0.02-0.18 mm. The change rate of the axial length of the individual jutting portion is in the range of 0 to 80% at least in a region of from its sliding surface to be faced to a cylinder, which is positioned at the tip of the jutting portion, to a position of 0.03 mm away from the aforementioned sliding surface in the radial direction of the oil ring main member.