Combustion Engine Cylinder Head Mantle Assembly
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Solution Overview
Problem
Camshaft free piston engines face pressure fluid limitations and temperature rises due to high pressure ratios in the pressure fluid circuit, leading to energy losses and oxidation risks, especially at high angular momentum outputs and engine speeds.
Innovation Solution
A combustion engine design featuring a cylinder head chamber that collects pressure fluid on the low-pressure side, reducing conduit requirements and temperature rise by allowing a varying pressure difference while maintaining a controlled pressure ratio, using a manifold system for compact and efficient fluid connection to valve actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the pressure of the pressure fluid is increased to achieve fast valve opening at high engine speeds, then the valve opening speed is improved, but the temperature of the pressure fluid increases leading to oxidation risks
Solution Approach 1:
A heat exchanger is introduced as an intermediary component in the pressure fluid circuit to remove excess heat from the pressure fluid after compression, preventing temperature rise and oxidation while maintaining the high pressure needed for fast valve opening
Solution Approach 2:
The system changes the temperature parameter of the pressure fluid by using a heat exchanger to cool it down after compression, allowing the pressure to remain high for fast valve opening while the temperature is reduced to prevent oxidation
2Stress or pressure
If the pressure ratio between high pressure side and low pressure side is increased to maintain sufficient pressure difference for valve actuation, then the valve actuation effectiveness is improved, but the temperature rise of the pressure fluid increases
Solution Approach 1:
The heat exchanger acts as a mediator that decouples the pressure ratio from temperature rise, allowing high pressure ratio for effective valve actuation while actively removing heat to maintain acceptable temperature levels
Solution Approach 2:
The pressure fluid circuit is designed to self-regulate temperature through the heat exchanger, which continuously removes excess heat generated during compression and expansion cycles, maintaining stable operating conditions
3Ease of operation
If individual conduits are used to connect valve actuators to the pressure fluid circuit, then the pressure fluid delivery is achieved, but the manufacturing complexity and assembly difficulty increase
Solution Approach 1:
Multiple individual conduits are merged into a single integrated manifold structure that distributes pressure fluid to multiple valve actuators, reducing the total number of components and simplifying assembly while maintaining effective pressure 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
This design reduces pressure fluid limitations and temperature rise, enhancing efficiency and preventing oxidation, while allowing for simpler assembly and operation of valve actuators with varying angular orientations.
Implementation Method 1
when the pressure of the pressure fluid shall be increased by way of a compressor from the low pressure downstream of the valve actuator to the high pressure upstream of the valve actuator
Implementation Method 2
a temperature rise occurs that increases concurrently with an increased pressure condition
Implementation Method 3
a part of the increased temperature at the low pressure side has to be lowered by cooling
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
According to a first aspect, the present invention relates to a combustion engine comprising, a cylinder head (6) comprising a controllable first engine valve (8) arranged to selectively open/close a combustion chamber (7) included in the combustion engine (1), a first valve actuator (10) operatively connected to said first engine valve (8), which first valve actuator (10) comprises at least one inlet opening (11) for pressure fluid and at least one outlet opening (12) for pressure fluid, and a closed pressure fluid circuit, wherein said first valve actuator (10) is arranged in said closed pressure fluid circuit. The combustion engine is further characterized by it comprising a cylinder head chamber (16) that forms part of said closed pressure fluid circuit and that is delimited by said cylinder head (6) and at least a first cylinder head mantle (17), wherein said at least one outlet opening (12) of the first valve actuator (10) is in fluid communication with said cylinder head chamber (16). According to a second aspect, the present invention relates to a mantle assembly for a cylinder head of a combustion engine.