Rotary Engine Casing Modular Design for Cooling and Repair
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Solution Overview
Problem
Rotary engine casings with liquid cooling features face manufacturing complexity and high replacement costs due to wear and damage from sliding contact with rotating rotors, limiting efficient and economical production methods.
Innovation Solution
A modular rotary engine casing design with split sections that allow for machining and assembly of fluid cavities, enabling easier replacement of seal-engaging plates and reducing the need for costly replacement of entire casing components, utilizing machined surface depressions to form fluid cavities for cooling and lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional casting methods are used to manufacture engine casings with cooling passages, then the cooling function is provided, but the manufacturing complexity increases and is limited to specific manufacturing methods
Solution Approach 1:
The engine casing is divided into a first casing section and a second casing section that can be assembled together. The fluid cavity is formed by a depression in one section and a corresponding protrusion in the other section, allowing the cooling passages to be created through simpler machining operations on separate components rather than complex casting of a single integrated piece.
2Reliability
If traditional integrated casing design is used, then cooling passages are provided, but the cost of replacing damaged components becomes expensive
Solution Approach 1:
By dividing the casing into separable sections with the fluid cavity formed at the interface between them, the design allows for easier repair. If damage occurs to the sliding contact surfaces, only the affected casing section needs to be replaced or reconditioned, rather than replacing the entire integrated casing assembly, thereby reducing replacement costs.
3Temperature
If cooling passages are integrated into the casing, then liquid cooling is provided, but the device complexity increases
Solution Approach 1:
The cooling system is segmented into modular components where the fluid cavity is created by the interface between two casing sections. This segmentation simplifies the overall structure by allowing standard machining operations on separate components rather than requiring complex integrated cooling passages, thereby reducing device complexity while maintaining cooling capability.
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 modular design simplifies assembly, reduces manufacturing costs, and allows for efficient cooling while minimizing the expense of replacing damaged components, enhancing the durability and economic viability of rotary engine casings.
Implementation Method 1
a fluid cavity (26) in fluid communication with a source of cooling fluid, for cooling the rotor housing (30)
Data Source
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AI summary
A rotary engine casing having at least one end wall of an internal cavity for a rotor including a seal-engaging plate sealingly engaging the peripheral wall to partially seal the internal cavity and a member mounted adjacent the seal-engaging plate outside of the internal cavity. The member and seal-engaging plate having abutting mating surfaces which cooperate to define between them at least one fluid cavity communicating with a source of liquid coolant. When the casing includes a plurality of rotor housings, the end wall may be between rotor housings. A method of manufacturing a rotary engine casing is also discussed.