Cylinder Head Top-Down Cooling for Injection Device Heat Control
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Solution Overview
Problem
Internal combustion engines often lack sufficient installation space on the intake side for effective cooling of the injection device, leading to inadequate cooling.
Innovation Solution
The intake ports are routed separately from a lateral flange surface of the cylinder head, with the injection device surrounded by a cooling chamber connected to a second cooling chamber, allowing for sufficient space and direct cooling from the cylinder block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the injection device is cooled using conventional cooling bore arrangements molded from one end face, then the cooling structure is simple to manufacture, but sufficient cooling space and effectiveness cannot be achieved in engines with more than two cylinders
Solution Approach 1:
The cooling system is segmented into multiple cooling chambers (first cooling chamber adjacent to fire deck, second cooling chamber separated by intermediate deck) with distinct functions. The injection device is surrounded by a dedicated cooling chamber formed by cooling bores routed from the lateral flange surface, separating the injection device cooling path from other cooling functions, thereby achieving both manufacturing simplicity and cooling effectiveness.
Solution Approach 2:
The cooling bores are routed from the lateral flange surface of the cylinder head rather than from the top or bottom face, utilizing a different dimensional approach. This lateral routing provides sufficient installation space for the injection device while maintaining manufacturing simplicity through a single-piece casting process.
2Area of stationary object
If the first intake port and second intake port are routed separately from a lateral flange surface, then sufficient installation space is provided for the injection device cooling, but the intake port arrangement becomes more complex
Solution Approach 1:
The lateral flange surface serves multiple functions: it acts as the routing origin for both the first and second intake ports, and simultaneously serves as the routing origin for the cooling bores that surround the injection device. This multi-functional use of the lateral flange surface provides sufficient installation space without requiring additional separate structures, thereby managing complexity.
3Reliability
If a cooling chamber surrounds the injection device and is connected to the second cooling chamber, then direct cooling from the cylinder block is achieved, but the cooling system structure becomes more complex
Solution Approach 1:
The cooling chamber surrounding the injection device is merged with the second cooling chamber, forming an integrated cooling system. The cooling bores are flow-connected between these chambers, allowing the coolant to flow continuously from the cylinder block through the second cooling chamber and into the injection device cooling chamber. This merging achieves direct cooling efficiency while avoiding the need for completely separate cooling systems, thereby managing structural 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
This configuration ensures adequate cooling of the injection device, optimizing installation space and enhancing cooling efficiency through a top-down cooling concept.
Implementation Method 1
the first cooling chamber and the second cooling chamber are flow-connected to one another in the region of the ignition device
Implementation Method 2
the injection device is at least partially surrounded by a cooling chamber which is flow-connected to the second cooling chamber
Data Source
AI summary
The invention relates to an internal combustion engine having a top-down cooling concept, in particular with a plurality of cylinders, having a liquid-cooled cylinder head with a first cooling chamber adjoining a fire deck and a second cooling chamber, which is separated from the first cooling chamber by an intermediate deck, and which is predominantly further away from the fire deck (10) than the first cooling chamber, wherein the first cooling chamber and the second cooling chamber are flow-connected to one another in the region of the ignition device, with an intake port arrangement on an intake side and an exhaust port arrangement on an exhaust side, having, per cylinder, two intake valves, two exhaust valves, an ignition device opening centrally into a combustion chamber and an injection device opening laterally into the combustion chamber, which is arranged between a first intake port and a second intake port of the intake port arrangement. In order to enable sufficient cooling of the injection device, the first intake port and the second intake port of each cylinder in the cylinder head are routed separately starting from at least one lateral flange surface of the cylinder head, and the injection device is at least partially surrounded by a cooling chamber, which is flow-connected to the second cooling chamber or is formed as part of the second cooling chamber.