Rotary Engine Cooling Jacket for Stator Heat Dissipation
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Solution Overview
Problem
Rotary internal combustion engines, such as Wankel engines, face challenges in effectively cooling high-temperature inserts, as conventional air gap cooling methods may not adequately protect the stator body from excessive heat.
Innovation Solution
A rotary internal combustion engine design featuring a stator body with a cooling jacket and a high-temperature insert made of a material with greater heat resistance, where the cooling jacket lines the insert opening and extends between the insert and the stator wall, and a cooling gallery surrounds the jacket to circulate coolant, preventing direct contact and enhancing heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an insert is used in hot areas of the stator body, then the heat resistance of the engine is improved, but the temperature of the insert increases causing excessive heat transfer to the stator body
Solution Approach 1:
A cooling jacket is introduced as an intermediary component between the high-temperature insert and the stator body wall. The cooling jacket contains coolant that absorbs heat from the insert, preventing excessive heat transfer to the stator body while allowing the insert to maintain its high-temperature operation for improved heat resistance
Solution Approach 2:
A cooling gallery is provided that allows coolant to flow around the cooling jacket and insert. The hydraulic cooling system efficiently removes heat from the insert through forced circulation of coolant, maintaining temperature control and preventing harmful heat accumulation in the stator body
2Reliability
If a cooling jacket is provided around the insert, then the cooling efficiency is improved, but the device complexity increases
Solution Approach 1:
The cooling jacket serves multiple functions simultaneously: it provides thermal isolation between the insert and stator body, contains the coolant flow path, and acts as a structural support element. This multi-functionality reduces the need for additional separate cooling components, thereby limiting the increase in device complexity while maintaining high cooling efficiency
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
This configuration provides a more uniform and efficient cooling system, allowing the use of lighter materials for the engine body and maintaining lower temperatures within the stator body while the insert operates at high temperatures, thereby improving engine durability and performance.
Implementation Method 1
a cooling jacket received in and lining the insert opening; a cooling gallery surrounding the cooling jacket and the insert, the cooling gallery defined at least in part by the cooling jacket such that a coolant circulated therein contacts the cooling jacket
Implementation Method 2
a coolant circulated therein contacts the cooling jacket
Implementation Method 3
the insert being made of a material having a greater heat resistance than that of the one of the walls
Data Source
AI summary
A rotary internal combustion engine having an insert opening defined in a hot area of one of the walls of the stator body and in communication with its internal cavity. A cooling jacket is received in and lines the insert opening. An insert is sealingly received in the cooling jacket and made of a material having a greater heat resistance than that of the wall. The cooling jacket extends between the insert and the wall along most of the length of the insert to prevent direct contact between the insert and the wall. A cooling gallery surrounds the cooling jacket and the insert, and is defined at least in part by the cooling jacket such that a coolant circulated therein contacts the cooling jacket. The cooling jacket is located between the cooling gallery and the insert.