Piston Cooling Nozzle With Independent Temperature And Pressure Valve
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Solution Overview
Problem
Existing piston cooling nozzles for internal combustion engines are complex and difficult to implement, with temperature and pressure thresholds often being characteristics of a single membrane, leading to tuning difficulties and increased production costs.
Innovation Solution
A piston cooling nozzle with a valve that adjusts based on both temperature and pressure of the cooling fluid, utilizing a spiral bimetallic strip for temperature-dependent activation and a helical spring for pressure-dependent sliding, allowing independent adjustment of the fluid outlet opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single membrane is used to control both temperature and pressure thresholds, then the nozzle structure is simplified, but the tuning difficulty increases and production costs increase
Solution Approach 1:
The single membrane control system is segmented into two independent control systems: a first membrane for temperature control and a second membrane for pressure control. This segmentation allows independent tuning of each threshold without affecting the other, resolving the contradiction between structural simplicity and ease of tuning while maintaining reasonable complexity through modular design.
2Device complexity
If a single membrane is used to control both temperature and pressure thresholds, then the nozzle structure is simplified, but the production costs increase
Solution Approach 1:
The control system is segmented into separate temperature and pressure control membranes, allowing standardized manufacturing of identical membrane components that can be produced through batch processes, reducing per-unit production costs despite increased part count.
3Measurement precision
If the valve closes the outlet opening completely, then the cooling fluid jet is precisely controlled, but the opposing forces increase
Solution Approach 1:
The valve employs partial closure rather than complete closure of the outlet opening. The closing element partially blocks the opening, allowing a controlled amount of cooling fluid to pass through while still achieving effective jet control. This partial action reduces the opposing forces that would result from complete closure while maintaining sufficient precision for proper cooling jet delivery.
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
Enables precise control of the cooling fluid jet to the piston, simplifying the nozzle's operation and reducing production costs by allowing independent adjustment of temperature and pressure thresholds, ensuring effective cooling while minimizing opposing forces.
Implementation Method 1
the rotational movement of the mobile valve is activated by an elastic element... the elastic element is a spiral bimetallic strip... Said bimetallic strip has temperature-dependent properties and is in contact with the cooling fluid. Said bimetallic strip can therefore unwind or roll up on itself depending on the temperature of the fluid
Implementation Method 2
the closing valve of the opening is movable in sliding along the axis X to allow the passage of fluid through the outlet opening from a pressure threshold... the movable valve is activated by an elastic element which has a reduced size and which, by simple expansion, is able to move in rotation the closing flap
Data Source
Figure 1~2
Figure 3~4
AI summary
Piston cooling fluid nozzle (10) of an internal combustion engine comprising: - a cylindrical chamber (11), - an outlet opening (14) for said fluid from the cylindrical chamber, characterized in that said nozzle comprises a shut-off valve (25) for the opening capable of having a first type of displacement as a function of pressure and a second type of displacement as a function of temperature different from the first type, to allow the passage of fluid through the outlet opening from a pressure threshold and from a temperature threshold.