Variable Lever Gear Mechanism Asymmetrical Power Stroke
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Solution Overview
Problem
Existing mechanisms for converting linear motion into circular or rotary motion are inefficient due to symmetrical power and travel strokes, resulting in periods of no energy transfer and reduced overall efficiency.
Innovation Solution
A lever-powered gear mechanism with asymmetrical power and travel strokes, utilizing a phase gear with four distinct segments and an adjustable cog connection, allows for continuous and efficient energy transfer by overlapping power cycles, enabling variable gear ratios and adapting to different applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a crank mechanism is used to convert linear motion to circular motion, then the mechanism is simple in structure, but the energy transfer efficiency is low due to symmetrical power and travel strokes
Solution Approach 1:
The patent applies asymmetry by designing a mechanism where the power stroke duration is deliberately made longer than the travel stroke duration. This is achieved through a specific geometric configuration of the connecting rod and crank, where the connecting rod length and crank radius are chosen to create an asymmetrical motion cycle. The asymmetrical design ensures that the piston remains in the power stroke position for a longer period, maximizing energy transfer efficiency while maintaining continuous motion.
Solution Approach 2:
The patent employs dynamics by making the mechanism parameters adjustable rather than fixed. The connecting rod length and crank radius can be varied to optimize the asymmetry ratio for different applications. This dynamic capability allows the mechanism to adapt its power-to-travel stroke ratio based on specific operational requirements, thereby optimizing energy transfer efficiency across different operating conditions while managing structural complexity.
2Loss of energy
If the power stroke is made longer than the travel stroke to improve energy transfer, then energy transfer efficiency increases, but the mechanism complexity increases
Solution Approach 1:
The patent applies asymmetry by designing a mechanism where the power stroke duration is deliberately made longer than the travel stroke duration. This is achieved through a specific geometric configuration of the connecting rod and crank, where the connecting rod length and crank radius are chosen to create an asymmetrical motion cycle. The asymmetrical design ensures that the piston remains in the power stroke position for a longer period, maximizing energy transfer efficiency while maintaining continuous motion.
Solution Approach 2:
The patent achieves multi-functionality by designing a mechanism that can operate in different modes by simply adjusting the geometric parameters. The same basic mechanism structure can be configured for different power-to-travel stroke ratios, or even reversed for applications requiring longer travel strokes. This universality allows a single design to serve multiple functions and applications, reducing the need for multiple specialized mechanisms and thereby managing overall system complexity.
3Reliability
If two gears are used to provide continuous power overlap, then continuous power transfer is achieved, but the device complexity increases
Solution Approach 1:
The patent applies merging by combining the functions of multiple gears into a single integrated gear system. Rather than using two separate gears that overlap, the invention uses one gear with asymmetric tooth distribution that achieves the same continuous power transfer effect. The gear has more teeth engaged during the power stroke portion of the cycle than during the travel stroke, creating an overlapping effect that ensures continuous power delivery while reducing the number of discrete components.
Solution Approach 2:
The patent applies segmentation by dividing the gear into functional segments with different tooth densities. The gear is designed with a higher concentration of teeth or different tooth profiles in the portion that engages during the power stroke compared to the travel stroke. This segmentation allows the single gear to perform multiple functions - providing both motion conversion and continuous power overlap - thereby achieving reliable continuous power transfer without the complexity of multiple separate gears.
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
The mechanism provides continuous and efficient energy transfer with variable gear ratios, overcoming inefficiencies in traditional systems by ensuring power is applied for a longer duration than travel, resulting in improved power transmission efficiency.
Implementation Method 1
A lever drives a segment gear in power and travel strokes in a mechanism where lever and gear have independent pivot points, and where the lever and gear are connected by an adjustable cog
Implementation Method 2
The reciprocating lever and segment gear mechanism delivers rotary motion to a driven gear
Data Source
AI summary
Phase gear and lever mechanism converts reciprocating power to rotary power with phase gear providing power stroke of greater duration than travel stroke so as to develop efficient power through a power stroke. A modified lever and gear mechanism converts reciprocating power to rotary power at variable out power ratio. In addition, an alternative embodiment of the variable lever is for use with the phase gear is provided.