Ball Valve Breather Structure for Engine Oil Prevention
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Solution Overview
Problem
Existing breather structures for internal combustion engines lack flexibility in placement and fail to prevent oil from flowing out during vehicle inclinations, limiting their effectiveness in mitigating pressure and maintaining engine integrity.
Innovation Solution
A breather structure featuring a ball valve with a guide sleeve and metallic valve element that opens and closes based on gravity, combined with an escape valve and damping member, allowing precise control of the breather hole's operation and preventing excessive pressure buildup, while ensuring the valve element moves smoothly and prevents oil from escaping during engine inclinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the breather hole is placed above the oil surface in the event of motorcycle overturn (as in JP-A No. H5-171915), then oil flowing out is prevented, but the freedom in placement of the breather hole is limited
Solution Approach 1:
The ball valve automatically opens and closes based on oil level and pressure conditions without external control. When oil rises to cover the valve during overturn, it blocks the breather hole automatically. When pressure builds up during normal operation, the ball is pushed up to open the hole, allowing self-regulating operation without limiting placement options.
Solution Approach 2:
The system changes the state of the breather hole dynamically - closed when oil level is high (preventing overflow), open when pressure is high (relieving pressure). This parameter change allows the same breather hole to serve multiple functions regardless of its placement location in the engine body.
2Reliability
If the intermediate portion of the breather pipe is placed lower than the connecting portion (as in JP-A No. 2003-54484), then oil flowing out is prevented, but the freedom in placement of the connecting portion is limited
Solution Approach 1:
The ball valve mechanism provides automatic oil prevention without requiring specific pipe routing. The ball simply drops to cover the valve when oil rises, regardless of how the breather pipe is connected or positioned, thereby eliminating constraints on connecting portion placement while maintaining oil prevention capability.
3Adaptability or versatility
If a ball valve mechanism is added to control the breather hole, then placement freedom is enhanced, but the device complexity increases
Solution Approach 1:
The ball valve uses purely passive mechanical elements - a spherical ball, a cylindrical hole, and a valve seat - that automatically respond to oil level and pressure changes. No springs, actuators, or complex mechanisms are needed. The ball's weight and the pressure differential provide the operating forces, minimizing structural complexity while enabling flexible placement.
Solution Approach 2:
The valve components are simple, inexpensive elements that can be easily manufactured and replaced if needed. The ball is a simple spherical object, the hole is a straightforward cylindrical feature, and the seat is a basic sealing surface - all much simpler than complex mechanical valve systems.
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 the flexibility in placement of the breather hole, effectively prevents oil from flowing out, and maintains optimal internal pressure by ensuring the valve element opens and closes precisely, even during temporary vibrations or inclinations, thus ensuring high breather performance and engine stability.
Implementation Method 1
A metallic valve element, formed to be ball-like with a predetermined weight... enabling the closing of the valve hole when seated on the valve seat
Implementation Method 2
received to be rollable in the guide sleeve, is provided for enabling the closing of the valve hole when seated on the valve seat
Implementation Method 3
an escape valve that opens when the maximum internal pressure is built inside the engine body with the operation of the internal combustion engine being provided in the engine body to bypass the ball valve
Data Source
AI summary
A ball valve includes a valve hole provided in an engine body to communicate with an inner end portion of a breather hole and is open in the engine body. A valve seat is formed on an inner surface of the engine body to coaxially surround the valve hole. A guide sleeve is in coaxially communication with the valve hole and the valve seat and is secured to the engine body at one end portion. A metallic valve element, formed to be ball-like with a predetermined weight is received to be rollable in the guide sleeve for enabling the closing of the valve hole and to be prevented from falling off the other end of the guide sleeve, is provided in the engine body so that the valve hole is placed within a moving range of oil in the engine body depending on the inclination of the engine body.