Sliding Coupler Bracket for Engine Thermal Displacement Compensation
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Solution Overview
Problem
Current engine systems face challenges in managing thermal strains and mitigating thermal fatigue risks, particularly in areas where brackets are adjacent to or between heat-sensitive components, due to inadequate temperature control and resonant frequency considerations.
Innovation Solution
A thermal displacement compensation assembly is introduced, featuring a coupler with a sleeve and sliding elements that allow relative movement between the cylinder head and exhaust manifold, enabling thermal growth decoupling and increasing the engine system's resonant frequencies to reduce thermal strains and vibration-related failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If brackets are rigidly coupled to heat-sensitive components, then structural stability is improved, but thermal strains and thermal fatigue risks increase
Solution Approach 1:
The bracket is divided into multiple segments: a first bracket portion rigidly coupled to the exhaust manifold, a second bracket portion coupled to the cylinder head, and a resilient portion connecting them. This segmentation allows each portion to perform its specific function while collectively resolving the contradiction between stability and thermal fatigue resistance.
Solution Approach 2:
The resilient portion is designed with specific material properties and geometric parameters (cross-sectional area, length, position) that change its mechanical characteristics. By optimizing these parameters, the bracket can maintain structural stability while accommodating thermal expansion and reducing thermal strains through controlled flexibility.
2Strength
If the engine system is designed to be sufficiently rigid, then resonant frequency goals are achieved, but thermal displacement compliance is reduced
Solution Approach 1:
Different portions of the bracket have different mechanical properties: the first and second bracket portions are designed for rigidity to meet resonant frequency requirements, while the resilient portion is designed for flexibility to provide thermal displacement compliance. This local differentiation of properties resolves the contradiction between overall stiffness and local adaptability.
3Ease of operation
If the bracket is positioned adjacent to the exhaust manifold, then support function is improved, but exposure to high temperature and thermal strains increases
Solution Approach 1:
The resilient portion acts as an intermediary element between the exhaust manifold and the cylinder head. It transmits the support function while simultaneously providing thermal isolation and accommodating thermal expansion, thereby reducing the harmful thermal effects on heat-sensitive components.
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
The solution effectively reduces thermal stresses and mitigates thermal fatigue risks by allowing relative thermal displacements between components, enhancing the engine system's stiffness and resonant frequencies, thereby improving durability and reducing the risk of component failures.
Implementation Method 1
a first component of the coupler is configured to slide with respect to a second component of the coupler such that relative movement between the bracket and one of the cylinder head and exhaust manifold is enabled by relative movement of the first component with the second component of the multi-layer coupler
Data Source
AI summary
A thermal displacement compensation assembly for an engine system including a cylinder head and an exhaust manifold coupled to the cylinder head. The thermal displacement assembly includes a bracket configured to be operatively coupled to cylinder head and to the exhaust manifold and a multi-layer coupler. The multi-layer coupler is configured to be disposed between the bracket and the cylinder head, wherein a first component of the coupler is configured to slide with respect to a second component of the coupler such that relative movement between the bracket and one of the cylinder head and exhaust manifold is enabled by relative movement of the first component with the second component of the multi-layer coupler.