Exhaust Gas Routing Component With Sliding Thermal Expansion Guide
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Solution Overview
Problem
Existing exhaust gas routing components for internal combustion engines experience significant thermomechanical loading due to different thermal expansion of the outer and inner bodies, leading to stress and potential failure at the fastening regions.
Innovation Solution
A sliding guide is introduced between the outer and inner bodies to allow relative movement, preventing undefined thermal and mechanical loads by enabling defined positioning through a fastening region while allowing movement in other regions, with guide projections and recesses ensuring a stable and thermally resistant connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the outer body and inner body are fixedly connected at both end regions to provide a fixed connection, then the structural stability is improved, but the thermomechanical loading at the fastening regions increases significantly
Solution Approach 1:
The patent divides the connection region into two functional segments: a fastening region where the inner body is fixed to the outer body to provide structural stability, and a sliding region where the inner body can move relative to the outer body to accommodate thermal expansion. This segmentation allows each region to perform its specific function optimally without compromising the other.
Solution Approach 2:
The patent introduces dynamic behavior to the inner body by allowing it to slide relative to the outer body in the sliding region. This dynamic capability enables the inner body to move freely in response to thermal expansion while maintaining a fixed connection in the fastening region, thereby reducing thermomechanical loading at the fastening points.
2Stress or pressure
If the inner body is allowed to move relative to the outer body to reduce thermomechanical loading, then the stress at fastening regions is reduced, but the positioning precision of the exhaust gas flow path deteriorates
Solution Approach 1:
The patent applies different connection characteristics to different regions: the fastening region provides fixed connection for structural stability and positioning, while the sliding region allows relative movement to reduce thermal stress. This local differentiation ensures that positioning precision is maintained where needed while stress reduction is achieved where required.
Solution Approach 2:
The sliding region acts as an intermediary mechanism between the inner body and outer body. It mediates the conflict between fixed positioning and thermal expansion by allowing controlled relative movement, thereby reducing thermomechanical loading without compromising the overall positioning precision of the exhaust gas flow path.
3Loss of energy
If double-walled construction with insulation material is used to reduce heat loss, then the thermal insulation action is improved, but the device complexity increases
Solution Approach 1:
The patent employs a nested double-walled construction where the inner body is received within the outer body. This nested structure provides thermal insulation by creating a gap between the two bodies, reducing heat loss while maintaining a relatively simple overall structure that does not require complex additional insulation 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 mitigates thermally induced stresses and vibrations, ensuring a stable and thermally insulated exhaust gas routing component with reduced mechanical loading and improved durability.
Implementation Method 1
the outer body and the inner body are heated to a different degree by the exhaust gas which substantially only comes into direct contact with the inner body, these are subject to different thermally induced dimensional changes
Implementation Method 2
foamed insulation material or insulation material which is constructed with fiber material and provides thermal insulation can be arranged in a gap between a generally tube-like outer body and a generally tube-like inner body
Data Source
AI summary
An exhaust gas routing component for an exhaust gas system of an internal combustion engine includes a tube-like component body with a first component body end region and a second component body end region arranged in the direction of a component body longitudinal axis at a distance from the first component body end region. The component body includes a tube-like outer body and a tube-like inner body received in the tube-like outer body. The inner body is fixed in a fastening region on the outer body. A sliding guide is provided which acts between the outer body and the inner body and permits a relative movement of the inner body in relation to the outer body outside the fastening region.