Rotary Engine Housing Cooling via Segmented Liner and Closeout
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Solution Overview
Problem
Rotary engine housings suffer from structural inefficiency and non-uniform cooling, leading to increased weight, reduced engine life, and complex, expensive castings due to traditional single-piece castings with complex internal passages for convective cooling.
Innovation Solution
A structurally efficient liquid-cooled rotor housing design featuring a primary rotor housing detail with axial fins for increased rigidity and cooling, combined with a corrugated closeout sheet forming axial flow passages that optimize coolant convective heat transfer and structural stiffness while minimizing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single-piece casting with complex internal passages is used for convective cooling, then cooling coverage is improved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The rotor housing is divided into two separate components: a shell and a liner. The liner contains the cooling passages and is inserted into the shell, eliminating the need for complex internal passages within a single casting. This segmentation simplifies manufacturing while maintaining cooling effectiveness.
Solution Approach 2:
A liner is introduced as an intermediary component between the cooling fluid and the rotor housing shell. The liner carries the cooling passages and fits within the shell, serving as a mediator that provides convective cooling without requiring the shell itself to contain complex internal passages.
2Device complexity
If traditional rotor housing design is used, then structural simplicity is maintained, but weight increases and structural efficiency decreases
Solution Approach 1:
By segmenting the housing into a shell and a separate liner, each component can be optimized independently. The liner can be made thinner and more efficient since it only needs to contain cooling passages, while the shell provides structural support, resulting in overall weight reduction.
Solution Approach 2:
The housing uses a composite structure combining the shell and liner, allowing different materials or thicknesses to be used in different regions to optimize the strength-to-weight ratio while maintaining structural simplicity.
3Temperature
If complex internal cooling passages are cast into the housing, then cooling functionality is achieved, but manufacturing cost and production difficulty increase
Solution Approach 1:
The cooling passages are relocated from the shell casting to a separate liner component. This allows the liner to be manufactured using simpler processes (such as extrusion or injection molding) and then assembled into the shell, dramatically easing manufacturing while preserving cooling functionality.
Solution Approach 2:
The liner serves as an intermediary that encapsulates the cooling passages, allowing these complex features to be manufactured separately using easier processes and then integrated into the final housing assembly.
4Temperature
If uniform cooling is attempted through traditional design, then thermal management is improved, but structural efficiency and weight are compromised
Solution Approach 1:
The liner can be designed with varying thickness and cooling passage density in different regions to provide locally optimized cooling. This allows uniform thermal management where needed while using thinner material elsewhere, maintaining structural efficiency and reducing overall weight.
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 design enhances cooling effectiveness, reduces weight, and improves structural integrity, leading to increased engine efficiency, extended life, and reduced manufacturing costs by allowing for optimized coolant flow and reduced lubrication requirements.
Implementation Method 1
forming axial flow passages between the inner surface and the closeout to receive coolant and form a coolant flow chamber
Implementation Method 2
The improved rotor housing may include axial fins that extend from the inner surface to increase rigidity and cooling
Implementation Method 3
The improved rotor housing may include axial fins that extend from the inner surface to increase rigidity and cooling
Implementation Method 4
forming axial flow passages between the inner surface and the closeout to receive coolant and form a coolant flow chamber
Data Source
AI summary
An engine includes a housing having a single wall, where the wall has a rib and a flange, and the wall provides a primary structure and cooling for the engine. A closeout is attached to an outer surface of the wall, and the closeout and the wall form a cavity. The closeout provides a secondary structure for containing a coolant fluid flow within the cavity. The closeout may be corrugated, and the ribs may be exposed to the cavity.