Jiggle Valve Air Bleed Structure for Engine Cylinder Head
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Solution Overview
Problem
Conventional coolant air bleed structures in water-cooled internal combustion engines require time-consuming bolt loosening during maintenance, leading to poor serviceability and hinder compact engine design and aesthetics due to upper cylinder head placement.
Innovation Solution
A coolant air bleed structure with a jiggle valve air bleed member is positioned at the vertical central sidewall of the cylinder head, eliminating the need for bolt loosening and allowing for more compact and aesthetically improved engine design by placing the air bleed member between intake and exhaust ports or in a protrusion on the sidewall, extending parallel to the cylinder head axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the air bleed member is disposed at the top (upper) portion of the cylinder head, then air bleeding function is achieved, but the engine cannot be built compactly vertically and appearance is poor
Solution Approach 1:
The air bleed member is relocated from the vertical upper portion to the sidewall of the cylinder head, changing the spatial dimension from vertical to lateral placement. This allows the engine to achieve better vertical compactness while maintaining the air bleeding function through the sidewall discharge path.
2Ease of operation
If the air bleed member is disposed at the top (upper) portion of the cylinder head, then air bleeding function is achieved, but bolt loosening is required during maintenance which increases time consumption
Solution Approach 1:
The air bleed member is designed with a jiggle valve that automatically opens to allow air bleeding when coolant level rises during maintenance, eliminating the need for manual bolt loosening. The system serves itself by using the coolant flow to trigger air discharge without requiring additional maintenance operations.
3Ease of operation
If the air bleed member is disposed at the top (upper) portion of the cylinder head, then air bleeding function is achieved, but the engine appearance is poor
Solution Approach 1:
The air bleed member is positioned in a localized area of the sidewall that is less visible from the exterior, and the discharge opening is directed toward the rear of the engine where it is hidden. This local placement strategy maintains the air bleeding function while minimizing visual impact on the overall engine appearance.
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
Enhances serviceability by eliminating the need for bolt loosening, promotes engine compactness, and improves appearance by strategically positioning the air bleed member in less noticeable areas, such as between ports or in protrusions on the sidewall.
Implementation Method 1
the jiggle valve of air bleed member opens when air is supplied to release the air from the coolant system of the engine
Data Source
AI summary
A coolant air bleed structure is provided for a water-cooled internal combustion engine having a plurality of cylinders and a cylinder head, formed at upper portion of the cylinders. The cylinder head includes a coolant jacket formed therein. The coolant air bleed structure is disposed in an air bleed hole formed in a protrusion formed at a substantially central vertical portion of a sidewall of the cylinder head. The coolant air bleed structure is operatively connected to the coolant jacket, and includes a jiggle valve which is configured to open during a coolant changing operation.