Piston Cooling Nozzle Crimp Locking Mechanism
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Solution Overview
Problem
Conventional piston cooling systems for internal combustion engines face challenges in withstanding external vibrations and oil pressure while maintaining a simple and cost-effective production process, as they often require complex bonding or press-fitting methods that increase production costs and complexity.
Innovation Solution
A piston cooling system with a nozzle pipe portion and a flow path forming member that is locked in an expanded pipe portion by deforming the distal end edge, eliminating the need for welding or bonding and enhancing the system's resistance to vibrations and oil pressure through a crimping or bending locking mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the end piece is fixed through bonding or welding, then the fixing strength is improved, but the production facility and process become more complex, leading to increased production costs
Solution Approach 1:
The patent replaces bonding or welding processes with a mechanical pressing mechanism. The pressing member applies axial force to press the end piece into the outlet pipe, creating a friction-based mechanical connection that eliminates the need for bonding facilities or welding equipment, thereby simplifying production while maintaining fixing strength
Solution Approach 2:
The end piece is designed with a pressing portion that has a larger outer diameter than the outlet pipe's inner diameter. When pressed in, the elastic deformation of the outlet pipe creates a friction force that automatically locks the end piece in place, making the connection self-sustaining without requiring additional bonding agents or welding procedures
2Ease of manufacture
If the end piece is pressed fitted into the outlet pipe, then the production process is simplified, but the pressing force must be large to withstand oil pressure, leading to an enlarged fixing construction
Solution Approach 1:
The patent transitions from radial pressing force to axial pressing force. The pressing member applies force in the axial direction, causing the outlet pipe to elastically deform radially inward and create friction against the end piece. This dimensional change in force application allows for a more compact fixing construction that can withstand oil pressure without requiring excessive pressing force
3Ease of manufacture
If the end piece is pressed fitted into the outlet pipe, then the production process is simplified, but the press-fit portion may loosen due to engine vibrations, requiring additional fixation measures
Solution Approach 1:
The design creates a self-locking mechanism where the end piece's pressing portion has a larger outer diameter than the outlet pipe's inner diameter. When pressed in, the elastic deformation of the outlet pipe generates continuous friction force that automatically prevents loosening from vibrations, making the connection self-sustaining without requiring additional fixation measures
Solution Approach 2:
The friction force generated by elastic deformation acts as a counteracting force against the loosening tendency caused by vibrations. This friction force continuously opposes any relative motion between the end piece and outlet pipe, preventing loosening without requiring additional mechanical restraints
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 solution simplifies the production process, reduces costs, and ensures a strong and rigid locking mechanism that effectively withstands oil pressure and vibrations, while also allowing for easy adjustment of oil jetting angles and directions for enhanced cooling efficiency.
Implementation Method 1
deforming a distal end edge of the expanded pipe portion so as to provide a locking portion which locks the distal end face of the flow path forming member
Data Source
AI summary
A piston cooling system includes: a nozzle pipe portion which communicates with an oil passage which is provided in an internal combustion engine and which extends towards an interior of a cylinder bore; and a flow path forming member which is fixed to a distal end portion of the nozzle pipe portion and in which a plurality of oil jetting paths are formed, wherein: the distal end portion comprises an expanded pipe portion where the nozzle pipe portion is expanded and the flow path forming member is fittingly inserted into the expanded pipe portion; the flow path forming member has a distal end face which is exposed to an exterior portion at a distal end side of the expanded pipe portion; and the flow path forming member is locked in the expanded pipe portion by deforming a distal end edge of the expanded pipe portion.