Combination Oil Ring Spacer Expander Grooves Prevent Freeze Up
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Solution Overview
Problem
Three-piece type combination oil rings with side rails and a spacer expander tend to freeze up due to unburned carbon deposits, leading to reduced performance as the deposits prevent the side rails from molding to the cylinder bore.
Innovation Solution
The design incorporates top and bottom side rails with a spacer expander featuring alternating top and bottom pieces, ear parts, and grooves that extend radially and open at the outer circumference, allowing for larger through holes that facilitate the discharge of deposits and prevent freeze-up by enabling oil flow and easy deposition removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If holes are formed at the center parts having the substantially flat surfaces between the peak parts and valley parts in the expander, then deposits can be discharged, but the rigidity of the expander becomes insufficient
Solution Approach 1:
The expander surface is segmented into multiple functional zones: peak parts that contact side rails, valley parts that form spaces, and center parts with grooves and through holes. This segmentation allows different regions to serve different purposes - structural support and deposit discharge simultaneously
Solution Approach 2:
Different regions of the expander are given different properties: peak parts maintain smooth surfaces for contact, while center parts between peaks and valleys are equipped with grooves and through holes for deposit discharge. This local differentiation resolves the contradiction by providing deposit discharge pathways only where they are needed, without compromising overall rigidity
2Reliability
If the spacer expander and side rails are pressed tightly to prevent oil leakage, then sealing performance improves, but deposits cause freeze-up and prevent the side rails from molding to the cylinder bore
Solution Approach 1:
The grooves and through holes act as intermediary pathways that allow lubricating oil to penetrate through the expander structure and reach the spaces between side rails and expander. This intermediary oil supply prevents deposit accumulation that would otherwise cause freeze-up, while maintaining the tight pressurization needed for sealing
Solution Approach 2:
The expander structure uses the lubricating oil itself to prevent deposit buildup. The grooves and through holes enable the oil to service the interface between the expander and side rails, cleaning deposits away and preventing freeze-up without requiring external intervention
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 solution effectively prevents the freeze-up of side rails and spacer expanders by allowing easy discharge of deposits through enlarged through holes, maintaining the oil ring's performance and rigidity.
Implementation Method 1
By having the grooves extend in the radial direction, having them not closed at the outer circumference sides, and having them open at the space parts, oil can flow in from the openings and flow from the outer circumference sides to the inner circumference sides
Implementation Method 2
the grooves are formed by plastic working
Data Source
AI summary
A combination oil ring prevented from freeze up of the side rails and spacer expander, that is, a combination oil ring of the present invention provided with a top and bottom pair of side rails 11 and 12 and a spacer expander 13 having large numbers of top pieces 14 and bottom pieces arranged separated in the axial direction and circumferential direction and alternating in the circumferential direction, connecting pieces 16 connecting adjoining top pieces 14 and bottom pieces 15, and ear parts 17 and 18 formed rising up at the inner circumference side ends of the top pieces 14 and bottom pieces 15 for pushing against the side rails 11 and 12, in which combination oil ring 10, grooves 19 and 20 are formed in at least one surfaces of top surfaces of the top pieces 14 and bottom surfaces of the bottom pieces 15, and through holes 17a and 18a by which the grooves 19 and 20 are communicated are formed in the ear parts 17 and 18.