Engine Room Heat Exhaust Layout for Transmission Overheat Prevention
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Solution Overview
Problem
Conventional engine room heat exhausting structures face challenges in preventing overheating of the driving force transmission mechanism located rearward of the engine, as hot cooling air from the engine exhaust system can reach and overheat this mechanism.
Innovation Solution
An engine room heat exhausting structure is designed with a discharging part on the splash shield positioned rearward of the exhaust emission control device, directing high-temperature cooling air into the wheelhouse, thereby preventing overheating of the driving force transmission mechanism. This structure includes a heat shielding cover and an undercover to manage air flow and heat discharge effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling air is introduced into the engine room to cool the exhaust emission control device, then the heat discharge from the engine room is stimulated, but the hot cooling air reaches the driving force transmission mechanism and causes overheating
Solution Approach 1:
The engine room space is segmented into distinct zones: a first space for introducing cooling air to cool the exhaust emission control device, and a second space for discharging the heated air before it reaches the driving force transmission mechanism. The partition wall with through-hole creates this spatial segmentation, separating the cooling function from the discharge function to prevent harmful heat transfer to the transmission mechanism.
Solution Approach 2:
The partition wall with a through-hole acts as an intermediary structure between the exhaust emission control device and the driving force transmission mechanism. It allows controlled passage of cooling air while preventing uncontrolled heat transfer, serving as a mediator that enables necessary air flow while blocking harmful thermal effects.
2Reliability
If the engine room is covered by engine cover and undercover to improve sound insulation and protection, then thermal insulation and pedestrian protection are improved, but heat discharge from the engine room becomes difficult
Solution Approach 1:
The covered engine room space is segmented into a first space and second space by a partition wall. The first space allows cooling air to circulate around the exhaust emission control device, while the second space provides a discharge path for heated air. This segmentation enables heat discharge functionality while maintaining the protective covering structure.
Solution Approach 2:
The cooling air flow is maintained continuously through the partition wall from the first space to the second space, ensuring uninterrupted heat dissipation. The through-hole in the partition wall allows the cooling action to continue without breaking the protective covering structure.
3Temperature
If cooling air flows around the exhaust system to cool the exhaust emission control device, then the device is effectively cooled, but the hot air reaches rearward components and causes overheating
Solution Approach 1:
The engine room is divided into a first space where cooling air contacts the exhaust emission control device, and a second space where the heated air is discharged. The partition wall with through-hole creates this segmentation, allowing the cooling function to be isolated from the driving force transmission mechanism while maintaining effective heat transfer to the exhaust device.
Solution Approach 2:
The heated cooling air is extracted from the first space through the partition wall into the second space before it can reach the driving force transmission mechanism. This extraction prevents the harmful thermal effect while preserving the beneficial cooling effect on the exhaust emission control device.
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 stimulates heat discharge from the engine room while preventing overheating of the driving force transmission mechanism by redirecting high-temperature cooling air away from it, ensuring efficient heat management and sound insulation.
Implementation Method 1
the cooling air which cooled the exhaust emission control device is discharged into the wheelhouse from a discharging part
Data Source
AI summary
An engine room heat exhausting structure configured to discharge heat from an engine room, is provided. The structure includes an engine room accommodating an engine with cylinders lined up in a front-and-rear direction of a vehicle, a wheelhouse provided outside the engine room in a vehicle width direction, an exhaust emission control device disposed between the engine and the wheelhouse, a splash shield configured to intercept water entering the engine room from the wheelhouse, and a discharging part provided to the splash shield at a location rearward of the exhaust emission control device and configured to discharge into the wheelhouse a portion of air that cooled the exhaust emission control device.