Cylinder Head Sleeve for Open Deck Engine Structural Support
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional internal combustion engines with open deck configurations face challenges in structural support and vibration at high operating pressures, leading to cylinder distortion and shake due to unsupported upper regions of cylinders, especially in turbocharged or supercharged engines.
Innovation Solution
The engine design incorporates a cylinder head with a sleeve protruding from its deck face, which intersects a cooling jacket surrounding the cylinders, providing structural support and reducing distortion and vibration by nesting and radially supporting the cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If an open deck configuration is used to reduce engine package size and weight, then weight reduction and compactness are improved, but structural support for the upper region of cylinders deteriorates, leading to cylinder distortion and shake at high operating pressures
Solution Approach 1:
The sleeve is nested within the cooling jacket channel, with the sleeve protruding from the head deck face and being received by the cooling jacket. This nested configuration allows the sleeve to provide structural support to the upper region of the cylinders while utilizing the existing cooling jacket space, thereby achieving both weight reduction through open deck design and maintaining cylinder structural integrity
Solution Approach 2:
The sleeve acts as an intermediary structural element between the head deck face and the upper region of the cylinders. It transfers and distributes the mechanical loads from the cylinders to the head and cooling jacket structure, preventing cylinder distortion and shake while maintaining the lightweight open deck configuration
2Ease of manufacture
If die casting technique is used instead of sand casting to reduce manufacturing complexity and cost, then ease of manufacture is improved, but achieving sufficient strength properties deteriorates
Solution Approach 1:
The sleeve is integrated as part of the head assembly that mates with the die-cast block. By combining the sleeve structure with the head deck face and cooling jacket, the design compensates for the relatively lower strength of die-cast materials, achieving strength properties comparable to sand casting while retaining the manufacturing advantages of die casting
3Temperature
If the cooling jacket channel intersects the block deck face to provide cooling, then cooling efficiency is improved, but structural support for cylinders deteriorates
Solution Approach 1:
The cooling jacket channel serves multiple functions: it provides cooling to the cylinders while also housing the sleeve that offers structural support. The channel intersects the block deck face to enable efficient cooling, and simultaneously accommodates the sleeve that prevents cylinder distortion, thereby achieving both thermal management and structural support objectives
Data Source
AI summary
An engine has a cylinder block with first and second cylinders separated by a bore bridge. The block has a cooling jacket with a cooling channel intersecting a block deck face and circumferentially surrounding the first and second cylinders such that the engine block has an open deck configuration. The engine has a cylinder head with a surface configured to mate with the deck face of the block. The surface of the head has a sleeve protruding therefrom. The sleeve is sized to be received by the channel to circumferentially surround the first and second cylinders to structurally support the cylinders.