Cylinder Head Outlet Cooling Jacket with Transverse Passages
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cylinder head designs for internal combustion engines inadequately cool thermally highly loaded areas around outlet orifices, leading to inefficient heat dissipation.
Innovation Solution
A coolant jacket is arranged completely on the outlet side with transverse cooling passages and sub-passages that surround outlet channels, ensuring effective cooling of these critical areas, and optionally a separate coolant jacket on the inlet side for independent cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If coolant jackets extend over both inlet and outlet sides, then cooling coverage is improved, but coolant consumption increases and structural complexity increases
Solution Approach 1:
The coolant jacket is segmented into two independent systems: a first coolant jacket for the outlet side and a second coolant jacket for the inlet side. Each jacket has its own coolant collection channel and cooling chambers, allowing independent cooling of thermally loaded areas without requiring coolant to circulate through the entire cylinder head, thus reducing overall coolant consumption while maintaining adequate cooling coverage.
Solution Approach 2:
Each coolant jacket is locally optimized for its specific region. The outlet side jacket features cooling chambers that completely surround outlet channels with cooling sub-passages extending approximately 180° around outlet openings, providing intensive localized cooling where thermal loads are highest, rather than distributing coolant uniformly throughout the entire cylinder head.
2Temperature
If coolant jackets extend over both inlet and outlet sides, then cooling coverage is improved, but cylinder head strength deteriorates
Solution Approach 1:
Dividing the coolant system into separate inlet and outlet jackets reduces the total volume of coolant channels required in the cylinder head structure. This segmentation allows for more efficient use of cooling passages in thermally critical areas while minimizing structural interference, thereby preserving cylinder head strength.
3Device complexity
If coolant flows in longitudinal direction only, then structural simplicity is improved, but cooling efficiency of thermally loaded areas deteriorates
Solution Approach 1:
The cooling passage arrangement is asymmetrically designed to match the thermal load distribution. Cooling sub-passages are positioned to extend approximately 180° around outlet openings on the outlet side, creating asymmetric cooling zones that target thermally loaded areas more effectively than symmetric longitudinal flow patterns.
Solution Approach 2:
The cooling system transitions from purely longitudinal flow to include transverse cooling passages that extend laterally from the central coolant collection channel. These transverse passages create a two-dimensional cooling network that reaches into thermally loaded regions around outlet channels, improving cooling efficiency without requiring complex three-dimensional passage configurations.
4Temperature
If cooling passages are added to improve cooling, then cooling efficiency is improved, but device complexity increases
Solution Approach 1:
The coolant jacket is segmented into functional zones with a central coolant collection channel and peripheral cooling chambers. This segmentation allows cooling passages to be organized in a modular fashion, improving cooling efficiency through targeted heat removal while maintaining manageable structural complexity through systematic arrangement.
Solution Approach 2:
The coolant collection channel serves multiple functions: it collects coolant from all cylinders, distributes coolant to various cooling chambers, and acts as a structural element within the cylinder head. This multi-functionality reduces the need for separate dedicated passages, improving cooling efficiency without proportionally increasing 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 allows for efficient cooling of thermally loaded areas with reduced coolant quantities, maintaining cylinder head strength and achieving even temperature distribution, while allowing for independent cooling of the outlet and inlet sides.
Implementation Method 1
a first coolant jacket is arranged in the cylinder head, said first coolant jacket comprising a first coolant collection channel which extends along the cylinder head on the outlet side over the outlet channels, wherein the first coolant collection channel is connected to cooling chambers at least partially surrounding the outlet channels
Data Source
AI summary
A cylinder head of an internal combustion engine with several cylinders includes an inlet side and an outlet side with at least two outlet channels per cylinder, wherein a first coolant jacket is arranged in the cylinder head, the first coolant jacket including a first coolant collection channel which extends along the cylinder head on the outlet side over the outlet channels. The first coolant collection channel is connected to cooling chambers at least partially surrounding the outlet channels, the cooling chambers being in a fluidic connection with at least one transfer opening in a cylinder head gasket plane, wherein one first transfer opening per cylinder is arranged in a first transverse engine plane containing a cylinder axis, and wherein a first transverse cooling passage extends from each first transfer opening in the first transverse engine plane between two respective outlet channels, the first transverse cooling passage splitting into two cooling sub-passages in the area of the cylinder axis. Each cooling sub-passage respectively surrounds an outlet channel in the area of a respective outlet opening over an angle (α) of approximately 180° and each cooling sub-passage is connected to the coolant collection channel by means of a second transverse cooling passage, wherein each second transverse cooling passage is arranged in the area of a second transverse engine plane extending through at least one cylinder head bolt bore.