Integrated Cooling Passage for Engine and Exhaust Pipe
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Solution Overview
Problem
Conventional internal combustion engines have a complex cooling water passage structure due to separate injection and discharge passages for the engine body and exhaust pipe, leading to increased complexity.
Innovation Solution
An internal combustion engine design that connects the engine body cooling water passage with the exhaust pipe cooling water passage through a supply and return passage, eliminating the need for dedicated passages for injection and discharge into/from the exhaust pipe, thereby simplifying the cooling water passage structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate cooling water passages are provided for the engine body and exhaust pipe, then the cooling function is ensured, but the cooling water passage structure becomes complicated
Solution Approach 1:
The patent merges the engine body cooling water passage and exhaust pipe cooling water passage into a single integrated cooling water passage structure. The cooling water passage is formed to extend through both the engine body and exhaust pipe, allowing cooling water to flow continuously from the engine body through the exhaust pipe to the silencer, thereby simplifying the overall structure while maintaining effective cooling of both components.
Solution Approach 2:
The cooling water passage is designed to serve multiple functions simultaneously: it cools the engine body, cools the exhaust pipe, and provides a thermal barrier between the exhaust system and silencer. This multi-functional design eliminates the need for separate dedicated passages, reducing structural complexity while ensuring reliable cooling performance.
2Reliability
If dedicated passages are provided for injecting and discharging cooling water into/from the exhaust pipe cooling water passage, then the cooling efficiency is improved, but the passage structure becomes more complex
Solution Approach 1:
The injection and discharge functions are integrated into the continuous cooling water passage. Cooling water is injected into the exhaust pipe cooling water passage through the continuous passage structure from the engine body side, and discharged through the same continuous passage to the silencer, eliminating the need for separate dedicated injection and discharge passages.
Solution Approach 2:
The cooling water passage is designed as a continuous flow path that maintains uninterrupted cooling water circulation. The passage extends continuously from the engine body through the exhaust pipe to the silencer, ensuring continuous cooling action without requiring separate injection and discharge mechanisms, thereby simplifying the structure while maintaining 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 design simplifies the cooling water passage structure, enhances cooling efficiency by allowing continuous flow between the engine body and exhaust pipe, and allows for symmetrical attachment of exhaust pipes to cylinder heads without directional changes, improving sealing and cooling performance.
Implementation Method 1
the engine body and the exhaust pipe are cooled by cooling water flowing through the engine body cooling water passage and the exhaust pipe cooling water passage
Data Source
AI summary
An internal combustion engine includes: an engine body; an exhaust pipe fastened to the engine body; an engine body cooling water passage provided in the engine body and having a cooling water injection port and a cooling water discharge port; an exhaust pipe cooling water passage provided in the exhaust pipe; a supply passage that connects the engine body cooling water passage with the exhaust pipe cooling water passage such that cooling water flows from the engine body cooling water passage to the exhaust pipe cooling water passage through the supply passage; and a return passage that connects the engine body cooling water passage with the exhaust pipe cooling water passage such that the cooling water flows from the exhaust pipe cooling water passage to the engine body cooling water passage through the return passage.