Combined Oil Ring Spacer Structure for Carbon Sludge Control
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Solution Overview
Problem
Conventional combined oil rings face issues with carbon sludge deposition between the side rails and spacer expander, especially in narrow spaces and corner parts, which hinders engine oil flow over time, leading to piston seizure prevention failures.
Innovation Solution
The combined oil ring design includes a space forming part continuous with the side rail support part, featuring a groove communicated with a through-hole, forming a closed system that prevents carbon sludge deposition by securing a larger volume for oil discharge, with specific dimensions and shapes to enhance oil flow and prevent sludge accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the step of the side rail support part is formed larger or the groove is formed deeper, then carbon sludge deposition is prevented more effectively, but the narrowest portion space becomes too small and corner parts still accumulate sludge
Solution Approach 1:
The spacer expander is divided into multiple functional segments: the side rail support part with its step structure, the space forming part creating a larger cavity, and the groove system. This segmentation allows each part to perform its specific function - the step prevents sludge from reaching the narrowest portion, while the space forming part provides a reservoir for oil and sludge collection, and the groove system facilitates oil flow and sludge removal.
Solution Approach 2:
The invention transitions from a two-dimensional step structure to a three-dimensional space forming part with substantial volume. By creating a volumetric cavity between the side rail support part and the spacer expander body, the design provides adequate space in the radial dimension to prevent sludge accumulation while maintaining proper oil flow paths through the groove system.
2Device complexity
If conventional combined oil rings are used, then structure is simple, but carbon sludge accumulates in narrow portions and corner parts over time, hindering oil flow
Solution Approach 1:
The space forming part and groove system are pre-configured in the spacer expander design to proactively prevent sludge accumulation before it occurs. The step structure at the side rail support part creates a preliminary barrier that stops sludge from migrating to the narrowest portion, while the groove system is预先 designed to facilitate continuous oil flow and sludge removal throughout operation.
Solution Approach 2:
The space forming part acts as an intermediary chamber between the side rail support part and the groove system. This intermediate space serves as a collection area for spent oil and sludge, allowing the groove system to efficiently remove contaminants while maintaining proper lubrication in the critical narrowest portion between the side rails and spacer expander.
Data Source
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AI summary
Provided is a combined oil ring in which carbon sludge and the like are not deposited between side rails and a spacer expander even if an internal combustion engine is operated for a long period of time. A combined oil ring is configured to be fitted in an oil ring groove of a piston, and includes: a pair of upper and lower flat plate-like circular side rails; and a spacer expander arranged between the pair of upper and lower side rails. The spacer expander includes: a large number of upper pieces and lower pieces that are alternately arranged in a circumferential direction so as to be spaced apart in an axial direction and the circumferential direction; coupling pieces that respectively couple the adjacent upper pieces and lower pieces; and ear parts that are each formed so as to erect in an inner circumferential end portion of each of the upper pieces and the lower pieces, and serve to push the side rails. A side rail support part that abuts on the side rail is provided in an outer circumferential end portion of at least one of an upper surface of each upper piece and a lower surface of each lower piece. A space forming part spaced apart from the side rail support part in the axial direction is provided in the upper surface of the upper piece or the lower surface of the lower piece, such that a space is formed between the side rail and the upper surface of the upper piece or the lower surface of the lower piece. The space forming part and the side rail support part are continuous in the radial direction through a continuous part. A groove that is communicated with a through-hole in the ear part is formed in the space forming part along the radial direction. An outer circumferential end portion of the space forming part and the continuous part are not open toward the outer circumferential side and are closed.