Rotatable Valve Assembly for Internal Combustion Engine Cylinder Head
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Solution Overview
Problem
Current cylinder heads for internal combustion engines are bulky and heavy due to complex mechanisms converting rotational motion into linear motion for poppet valves, limiting combustion chamber area and engine efficiency, power output, and exhaust emissions.
Innovation Solution
A rotatable valve assembly with a valve body and shaft that rotates about a predetermined axis, eliminating the need for dedicated conversion mechanisms, allowing for elliptic or oval shapes that maximize working area and reduce space, and utilizing camshaft rotational motion directly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If complex mechanisms are used to convert rotational motion into linear motion for poppet valves, then valve operation is achieved, but cylinder head space and weight increase significantly
Solution Approach 1:
Instead of converting rotational motion to linear motion, the invention inverts the approach by using rotational motion directly to open and close the valve. The valve body rotates about its shaft to move between open and closed positions, eliminating the need for complex conversion mechanisms and thereby reducing cylinder head space.
Solution Approach 2:
The invention extracts and eliminates the motion conversion mechanism from the traditional valve system. By removing the cam-follower-conrod assembly and replacing it with a direct rotational valve operation, the cylinder head space is significantly reduced while maintaining valve operation functionality.
2Reliability
If round valve bodies and openings are used, then sealing is achieved, but combustion chamber area for gas flow is limited
Solution Approach 1:
The invention employs asymmetric valve body shapes such as elliptic or oval cross-sections instead of traditional round shapes. These asymmetric shapes provide adequate sealing through controlled contact surfaces while maximizing the open area for gas flow during the valve open position, thereby resolving the contradiction between sealing reliability and flow area.
Solution Approach 2:
The invention changes the geometric parameters of the valve body from circular to elliptic or oval shapes. This parameter change allows the valve to maintain effective sealing through appropriate contact surface design while increasing the effective flow area when open, thus improving both sealing and gas flow characteristics.
3Ease of operation
If multiple mechanical parts are used for motion conversion, then valve control is achieved, but device complexity and weight increase
Solution Approach 1:
The invention merges the valve control function directly into the rotational motion of the valve body itself. By combining the valve actuation mechanism with the valve body rotation, the system eliminates multiple separate mechanical parts (cams, followers, pushrods) and achieves valve control through a single integrated rotational movement.
Solution Approach 2:
The invention inverts the traditional approach by having the valve body itself perform the rotational movement that directly controls opening and closing, rather than using separate mechanical components to convert motion. This inversion simplifies the mechanical system by eliminating the need for multiple parts involved in motion conversion.
Data Source
AI summary
Generally, a rotatable valve assembly operative in an internal combustion engine is provided. The rotatable valve assembly may comprise a valve body rotatably supported in the cylinder head. The valve body may have various shapes which may allow to maximize an effective working area of a combustion chamber head and at the same time to decrease an overall space occupied by a cylinder head of the engine. The rotatable valve assembly may directly utilize an engine's camshaft rotational motion to drive the rotational motion of the valve body, thereby eliminating a need in dedicated mechanisms that convert the camshafts rotational motion into linear translational motion typically utilized in current cylinder heads. Finally, rotational motion of the valve body may reduce a time required to reach a maximal effective working area for air-fuel mixture supply and/or gas exhaust and/or may provide a smoother and quitter engine operation.