Intra-Head Bypass Passage for Engine Warming-Up Efficiency
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Solution Overview
Problem
The existing engine water-cooling devices have low warming-up efficiency due to the bypass passage being exposed outside the engine, leading to heat radiation and reduced water temperature of the engine cooling water.
Innovation Solution
Incorporating an intra-head bypass passage within the cylinder head, which extends from behind the thermostat housing to above the cooling water pump, allowing the engine cooling water to receive heat from the cylinder head, thereby reducing temperature reduction and enhancing warming-up efficiency. Additionally, a thermostat housing with a partitioned structure simplifies manufacturing and reduces horsepower loss by minimizing water passage resistance, and a heat insulating layer maintains high insulating properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bypass passage is exposed outside the engine, then the structure is simple, but heat radiation occurs and warming-up efficiency is low
Solution Approach 1:
The bypass passage is nested within the cylinder head structure, with the bypass passage hole formed inside the cylinder head body. This nesting approach allows the bypass passage to be protected by the cylinder head's outer wall, preventing heat radiation while maintaining structural integration and simplifying manufacturing through unified casting or machining.
2Ease of operation
If the bypass passage is outside the engine, then installation is easy, but heat loss occurs reducing water temperature
Solution Approach 1:
The bypass passage is merged with the cylinder head structure, forming an integrated component where the bypass passage hole is part of the cylinder head's internal geometry. This merging eliminates separate external piping, reduces heat loss by enclosing the passage within the engine's thermal mass, and maintains installation ease through standardized mounting interfaces.
3Ease of repair
If the bypass passage is exposed, then maintenance is simple, but warming-up performance is poor
Solution Approach 1:
The bypass passage function is extracted from external piping and relocated to the cylinder head's internal structure. The bypass passage hole is formed as an internal feature of the cylinder head, allowing cooling water to bypass the radiator through an internal route that is protected from heat loss, thereby improving warming-up performance while maintaining accessibility for maintenance through standard engine access points.
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 increases engine warming-up efficiency by suppressing water temperature reduction, reducing horsepower loss, and maintaining high heat insulating properties, while also facilitating easy manufacturing and communication between components.
Implementation Method 1
engine cooling water receives heat from the cylinder head while passing through the intra-head bypass passage
Implementation Method 2
a heat insulating layer maintains high insulating properties
Data Source
AI summary
There is provided an engine water-cooling device that can increase warming-up efficiency of an engine. The engine water-cooling device includes a thermostat housing 2 that houses a thermostat 1. The thermostat housing 2 is mounted to a front wall 5a of a cylinder head 5 in one side portion in a width direction of the cylinder head 5. A cooling water pump 3 is mounted to a front wall 6c of a cylinder block 6 in a central portion in a width direction of the cylinder block 6. A bypass passage 4 includes an intra-head bypass passage 4a in the cylinder head 5, and the intra-head bypass passage 4a includes a width-direction passage portion 4c extending from a position behind the thermostat housing 2 to a position behind and above the cooling water pump 3.