Multi-slope Piston Insertion Cone for Ring Guidance
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Solution Overview
Problem
Existing piston insertion cones with a single slope internal surface fail to guide piston segments correctly, leading to potential breakage during assembly, and do not effectively reduce engine rework or dismantling rates.
Innovation Solution
A cone with a conical inner surface featuring a first sloped section of 10°, a second sloped section of 6°, and a cylindrical connecting section, allowing tilting during piston insertion, formed from angular sectors for precise guidance and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-sloped internal surface is used in the piston ring inserter, then the device structure is simple, but the piston and rings are not adequately guided during insertion, causing rings to shift and potentially break
Solution Approach 1:
The conical internal surface is segmented into multiple sections with different slopes (first sloped section, second sloped section) separated by a cylindrical connecting section. This segmentation allows each section to perform a specific guiding function, ensuring proper ring positioning while maintaining structural simplicity.
Solution Approach 2:
Different sections of the conical surface have different local qualities (slopes) optimized for specific functions. The first sloped section has a steeper angle for initial guidance, while the second sloped section has a gentler angle for final positioning, with the cylindrical connecting section providing a transition zone. This local differentiation improves ring positioning accuracy without significantly increasing overall device complexity.
2Ease of manufacture
If a single-sloped internal surface is used, then manufacturing is simpler, but ring breakage risk increases due to inadequate guidance
Solution Approach 1:
The conical surface is divided into manageable segments (first sloped section, second sloped section) that can be manufactured separately or in stages, reducing manufacturing difficulty while improving guidance functionality and ring integrity.
Solution Approach 2:
The multi-section conical surface performs preliminary guidance actions in sequence: the first sloped section provides initial alignment, the cylindrical connecting section transitions the piston, and the second sloped section completes the positioning. This preliminary action sequence prevents ring breakage by ensuring proper guidance throughout the insertion process.
3Reliability
If proper guidance is provided for piston insertion, then ring breakage is prevented, but the device complexity increases
Solution Approach 1:
The conical surface uses local quality variations (different slopes in different sections) to provide proper guidance functionality. This approach achieves reliable piston and ring assembly while keeping the overall device structure relatively simple, as the complexity is distributed locally rather than requiring a completely complex mechanism.
Data Source
Figure 1~2
AI summary
The invention concerns a device for facilitating the insertion of a piston with the segments thereof into a cylinder of a vehicle internal combustion engine. This novel device has the shape of a cylindrical tube comprising a tubular lower portion intended to guide said tube into the cylinder of the engine and called "portion for guiding into the cylinder" (11), and a tubular upper portion intended to guide and insert the piston with the segments thereof and called "piston insertion portion" (12). The piston insertion portion (12) has a conical inner surface comprising, in the axial direction ("ZZ'") of the tube, first (12A) and second (12B) sloping sections. The two sections (12A, 12B) have different slopes and are separated by a cylindrical connection section (12C) so as to allow tilting from one slope to the other in good conditions when the piston is inserted. Motor vehicles. Assembly of internal combustions engines of motor vehicles. Assembly of pistons with the segments thereof in the cylinder housings of motor vehicles.