Partial Cylinder Liner Structure for Lightweight Engine Recycling
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Solution Overview
Problem
Existing cylinder liners in reciprocating engines face challenges in recycling due to enveloped casting, difficulty in separation, and weight reduction limits, especially for spiny liners, which are not environmentally friendly, and there is a need for designs that cater to low-revolution and mid-load engines.
Innovation Solution
A cylinder liner with a novel structure that is partially provided within the cylinder, featuring recessed and protruding forms, allowing for easier extraction and separation, reduced weight, and improved recycling performance, while maintaining wear resistance and reducing unevenness at the boundary with the cylinder block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If enveloped casting is used to manufacture the cylinder block with the cylinder liner, then the joining strength between the cylinder liner and the cylinder block is improved, but the difficulty of separating the cylinder liner from the cylinder block increases
Solution Approach 1:
The invention divides the cylinder liner structure into two distinct parts: a smooth cylindrical body portion and a separate protrusion portion. The protrusions are designed to be detachable from the cylinder block, while the main body remains securely joined. This segmentation allows the joining strength to be maintained through the protrusions during operation, while enabling easy separation of the protrusion portions during disassembly or recycling.
Solution Approach 2:
The invention extracts the protrusion portions from the main cylinder liner body, making them separate, detachable elements. These protrusions can be removed independently from the cylinder block after the engine reaches the end of its service life, while the main cylinder liner body remains integrated with the block. This extraction principle directly addresses the contradiction by allowing strong joining during use but easy separation during disposal.
2Strength
If the cylinder liner is designed as a spiny liner with protrusions to improve joining strength, then the joining strength with the cylinder block is improved, but the recycling performance deteriorates
Solution Approach 1:
The cylinder liner is segmented into a permanent body portion that remains with the cylinder block and removable protrusion portions that can be separated for recycling. This segmentation enables the protrusions to provide the necessary joining strength while allowing the main liner material to be recovered and recycled separately, thus improving recycling performance.
Solution Approach 2:
The invention is designed so that the protrusion portions can be discarded (removed) from the cylinder block, while the main cylinder liner body is recovered and recycled. This aligns with the discarding and recovering principle by separating the components that need to be discarded (protrusions) from those that should be recovered (main liner material), thereby improving overall recycling performance.
3Weight of moving object
If the entire length of the cylinder liner is reduced to decrease weight, then the weight reduction is achieved, but the sliding characteristics and wear resistance may deteriorate
Solution Approach 1:
The invention applies local quality by concentrating the functional protrusions at specific locations where they are most needed for joining strength and stability. The main body of the cylinder liner is kept smooth and uniform to maintain optimal sliding characteristics with the piston rings. This localized approach allows weight reduction through minimized liner length while preserving reliability through strategically placed protrusions that provide necessary mechanical interlocking.
Data Source
AI summary
In order to enable improvement with respect to recycling performance, achieve further reduction in weight, and improve environmental performance, a cylinder liner (30) according to the present disclosure has a structure in which, out of an inner face (21i) of a cylinder (21) in a reciprocating engine, the cylinder liner is provided in only a partial region over which a piston ring (50) fit onto a piston (40) that performs reciprocal motion in the cylinder (21) slides, and a liner entire length L along an axial direction of the cylinder (21) is smaller than an inner diameter B of the cylinder, and recessed and protruding forms are formed on one lower end portion (30d) that is an end portion toward a bottom dead center side of the piston ring (50) in the axial direction.