Piston Cooling Nozzle Bracket for Cylinder Liner Positioning
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Solution Overview
Problem
Existing piston cooling nozzles in internal combustion engines often have divergent, non-targeted spray patterns, leading to inadequate cooling of pistons, particularly in undercrown cooling galleries, due to imprecise orientation caused by casting inaccuracies.
Innovation Solution
A piston cooling nozzle with an integral bracket that engages the bottom end of a cylinder liner to accurately locate the nozzle outlet relative to the undercrown cooling gallery, ensuring precise positioning and effective cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a piston cooling nozzle with divergent, non-targeted spray pattern is used, then the cooling oil can be sprayed onto the piston, but the orientation precision is poor and only a small portion of cooling oil is sprayed into the cooling gallery
Solution Approach 1:
The nozzle assembly is segmented into a mounting bracket and a nozzle body, allowing independent positioning and adjustment. The bracket can be precisely positioned on the engine block while the nozzle body is separately oriented to target the cooling gallery opening, resolving the orientation precision issue.
Solution Approach 2:
The nozzle design incorporates adjustable components that allow dynamic positioning during installation to achieve precise alignment with the cooling gallery. This enables optimization of the spray pattern to deliver maximum cooling oil flow into the gallery while maintaining ease of installation.
2Ease of manufacture
If a casting process is used to locate the PCN, then the PCN can be mounted on the engine block, but the orientation accuracy varies due to casting inaccuracies
Solution Approach 1:
A positioning bracket serves as an intermediary component between the engine block and the nozzle. The bracket includes locating features that interface with the engine block and positioning features that align with the cooling gallery opening, mediating the transition from imprecise casting to accurate positioning.
Solution Approach 2:
The bracket is pre-positioned and pre-aligned during assembly to ensure accurate orientation of the nozzle relative to the cooling gallery before final installation. This preliminary positioning action compensates for casting inaccuracies and ensures precise alignment.
3Temperature
If additional cooling is provided to prevent piston overheating, then piston temperature can be controlled, but the complexity of the cooling system increases
Solution Approach 1:
The piston cooling system utilizes the engine's existing oil rifle and cooling oil supply, allowing the piston to cool itself using available resources. The nozzle is integrated into the existing engine block structure, eliminating the need for separate cooling systems and reducing overall complexity.
Solution Approach 2:
The piston cooling function is merged with the existing engine block structure and oil cooling system. The nozzle assembly integrates with the engine block mounting features and uses the same oil supply system, combining multiple functions into a unified system that reduces complexity.
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 allows for quick and accurate alignment of the piston cooling nozzle, ensuring proper cooling of the piston, preventing overheating and cracking, and maintaining target operating temperatures without requiring additional engine modifications.
Implementation Method 1
Heat is transferred via conduction heat transfer from the piston rings, land and skirt portions of the piston to the water jacket and crankcase oil
Implementation Method 2
Heat is transferred via conduction heat transfer from the piston rings, land and skirt portions of the piston to the water jacket and crankcase oil
Data Source
AI summary
An internal combustion engine includes an engine block having an oil rifle. A cylinder liner carried by the engine block includes a bottom end. A piston cooling nozzle coupled with the engine block includes an inlet in communication with the oil rifle, a tube, and a bracket coupled with the tube. The bracket engages the bottom end of the cylinder liner.