Oscillating Piston Engine with Non-Circular Gears
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Solution Overview
Problem
Conventional oscillating piston systems face challenges such as seal complexity and wear, lubrication issues, and the conversion of oscillatory motion to rotational motion, particularly in high-speed rotating systems, with few effective solutions for converting net-zero-motion rotational oscillations to continuous rotation.
Innovation Solution
The piston system employs coaxially mounted arms with pistons in stationary chambers, coupled to an energy transfer mechanism using non-circular gears, such as bilobe and planetary gears, to convert oscillatory rotational motion to unidirectional rotational motion, minimizing rotational forces and maximizing efficiency through balanced gear stacks and double helical gears.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oscillating piston systems use rotating or oscillating parts about a central axis to define working volume, then the combustion chamber can be formed, but seal complexity and wear increase significantly
Solution Approach 1:
The patent inverts the conventional approach by making the combustion chamber stationary rather than rotating/oscillating. The pistons oscillate within a fixed chamber, reversing the traditional role of moving and stationary components. This eliminates the need for complex rotating seals while maintaining combustion functionality.
Solution Approach 2:
The system divides the oscillating motion into two separate pistons that move in opposite directions within a stationary chamber. This segmentation allows each piston to handle half the oscillation cycle, simplifying the sealing requirements for each individual piston while maintaining the overall combustion cycle.
2Power
If conventional systems use high-speed rotating parts to convert oscillatory motion to rotational motion, then power output can be achieved, but lubrication issues and wear increase
Solution Approach 1:
The patent employs dynamic balancing through counterweighted arms that oscillate in opposite directions. This dynamic arrangement converts the oscillatory motion of pistons into continuous rotational motion of the output shaft while maintaining balance, reducing wear and improving lubrication conditions compared to unbalanced high-speed rotation.
3Productivity
If conventional oscillating piston systems convert oscillatory rotational motion to unidirectional rotational motion, then continuous rotation can be achieved, but the conversion mechanism complexity increases
Solution Approach 1:
The patent combines the motion conversion function directly into the combustion chamber structure itself. The stationary chamber and oscillating pistons work together with the counterweighted arms to simultaneously achieve combustion and motion conversion, eliminating the need for separate complex conversion mechanisms.
Solution Approach 2:
The system uses the oscillatory motion of the pistons themselves to drive the motion conversion through the counterweighted arms. The pistons serve dual purposes: containing combustion and driving the rotational output, making the system self-sufficient without requiring additional dedicated conversion components.
4Power
If conventional systems use large rotational forces in high-speed rotating systems, then power delivery can be maximized, but mechanical stress and wear increase
Solution Approach 1:
The patent uses counterweighted arms that oscillate in opposite directions to balance the mechanical forces. This counterbalancing reduces the net rotational forces and mechanical stress on the system components while maintaining effective power delivery through the output shaft.
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 configuration reduces wear, minimizes energy loss, and enhances efficiency by allowing common pressure seals and pressurized lubrication, while maintaining compactness and reducing vibration, effectively addressing the challenges of seal complexity and motion conversion in oscillating piston systems.
Implementation Method 1
The energy transfer mechanism includes coupled non-circular gears arranged to convert oscillatory rotational motion to unidirectional rotational motion
Implementation Method 2
maximizing efficiency through balanced gear stacks and double helical gears
Implementation Method 3
allowing common pressure seals and pressurized lubrication
Data Source
AI summary
A piston system comprises a first arm and a second arm, each mounted respectively on a first shaft and a second shaft, and being mounted for rotational oscillation about a central axis. Both arms terminate radially outward from the central axis, and are coupled to piston arrangements. The piston arrangements include pistons. Each set of pistons is mounted for movement within respective stationary chambers. Each stationary chamber may be defined, at least in part, by a piston coupled to the first arm and a piston coupled to the second arm. The stationary chambers are arranged about the central axis. The first and the second shaft are connected to an energy transfer mechanism. An energy transfer mechanism includes coupled non-circular gears arranged to convert oscillatory rotational motion to unidirectional rotational motion.