Rotating Port Valve Timing for Camless Engine Cylinders
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Solution Overview
Problem
Conventional internal combustion engine valve systems are complex, inefficient, and require substantial maintenance due to their reliance on camshaft-controlled reciprocating poppet-valve mechanisms, which have many precision moving parts subject to wear.
Innovation Solution
A valve system that eliminates the camshaft and reciprocating valve train by using rotating port members aligned with fixed ports in the engine cylinder, driven directly by the crankshaft, allowing for efficient timing of intake and exhaust valve operations through a gear mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If camshaft-controlled reciprocating poppet-valve mechanisms are used, then precise valve timing control is achieved, but device complexity increases and maintenance requirements increase
Solution Approach 1:
The patent removes the camshaft from the valve train system, extracting the source of complexity while preserving valve timing control through an alternative mechanism using a timing chain and gear-driven camless valve actuation
Solution Approach 2:
The patent replaces the mechanical camshaft-based valve timing system with a gear-driven timing chain system that directly actuates the valves, eliminating the need for camshafts, pushrods, and rocker arms
2Measurement precision
If camshaft-controlled reciprocating poppet-valve mechanisms are used, then valve timing control is achieved, but the number of moving parts increases
Solution Approach 1:
The patent extracts and removes multiple moving parts including camshafts, pushrods, rocker arms, and valve springs from the system, reducing the overall quantity of moving components while maintaining valve timing functionality
Solution Approach 2:
The patent combines the timing function and valve actuation function into a single integrated gear-driven mechanism, eliminating the need for separate camshafts and associated components
3Ease of operation
If camshaft-controlled reciprocating poppet-valve mechanisms are used, then valve operation is controlled, but reliability decreases due to wear
Solution Approach 1:
The patent replaces the wear-prone mechanical camshaft contact system with a gear-driven timing chain system that uses meshing gears for precise timing and direct actuation, reducing friction and wear points
Solution Approach 2:
The timing chain system automatically maintains synchronization between the crankshaft and valve actuation through its gear meshing mechanism, providing self-adjusting timing without requiring periodic manual adjustment of valve clearances
4Measurement precision
If camshaft-controlled reciprocating poppet-valve mechanisms are used, then valve timing is controlled, but manufacturing complexity increases
Solution Approach 1:
The patent removes the camshaft assembly and its associated precision-machined components from the manufacturing process, simplifying production by eliminating complex cam profile machining and assembly operations
Solution Approach 2:
The patent segments the valve train into modular components including the timing chain, gear-driven actuation mechanism, and simplified valve assembly, making each component easier to manufacture and assemble independently
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
This solution simplifies the valve timing process, reduces the number of moving parts, and enhances efficiency by eliminating the need for a camshaft and associated components, resulting in a more practical and cost-effective mechanism for controlling intake and exhaust cycles.
Implementation Method 1
A first gear-driven rotating port member is disposed alongside a wall of the engine cylinder
Data Source
AI summary
In an internal combustion engine, first and second rotating members, one for the intake valve and one for the exhaust valve rotate next to the outside of an engine cylinder on opposite sides thereof when driven by a drive gear attached to the end of the engine's crankshaft. Each rotating member may include a ring gear having a valve port or aperture near its perimeter that cyclically aligns with a corresponding valve port formed through the cylinder wall near the top of the cylinder. A method of controlling valve timing comprises the steps of causing the rotating member containing the second valve port to periodically align in synchronism with the first port to control the passage of an air/fuel mixture and exhaust gases through the combustion cycles of the engine.