Stepless Gear Drive Train for Variable Torque Transfer
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Solution Overview
Problem
Existing driving units for kitchen utensils lack efficient mechanisms to transmit force effectively from a handle to a processing implement, resulting in suboptimal torque distribution and operation.
Innovation Solution
A drive train mechanism utilizing a stepless gear system with a spiral radius gear and quarter pinion, combined with a flexible link and springs, that adjusts torque and speed as the handle is cycled, ensuring efficient rotation of the processing implement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional driving unit is used to transmit force from handle to processing implement, then the structure is simple, but the torque distribution and force transmission efficiency are suboptimal
Solution Approach 1:
The patent applies a stepless gear system where the spiral radius gear allows continuous variation of the gear ratio as the handle is cycled. The radius of the spiral gear changes continuously during rotation, enabling dynamic adjustment of torque and speed throughout the rotation cycle rather than fixed gear ratios, thereby optimizing power transmission adaptability.
Solution Approach 2:
The spiral radius gear utilizes a curved spiral path instead of straight or circular gear teeth. This curved geometry allows the point of contact between gears to move along a spiral trajectory, enabling continuous variation of the effective radius and gear ratio, which optimizes torque distribution throughout the rotation cycle.
2Productivity
If a stepless gear system with spiral radius gear is used, then torque and speed are optimized throughout the rotation cycle, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into the spiral radius gear mechanism itself. The same spiral gear structure simultaneously achieves stepless gear ratio variation, torque optimization, and smooth force transmission without requiring separate control mechanisms or additional components, thereby improving productivity while limiting the increase in overall device complexity.
Solution Approach 2:
The spiral radius gear changes the geometric parameter of the effective radius continuously during rotation. By varying the radius parameter along the spiral path, the gear system achieves continuous adjustment of gear ratio and torque multiplication, optimizing force transmission efficiency throughout the rotation cycle.
3Ease of operation
If quarter pinions with varying radii are used, then smooth force transfer is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The quarter pinions utilize curved spiral tooth profiles instead of straight or circular profiles. This curvature allows the effective radius to vary smoothly along the spiral path, enabling smooth force transfer and continuous gear ratio adjustment while distributing manufacturing tolerances along the curved path rather than requiring precise control at discrete points.
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 a smooth and efficient transfer of force from the handle to the processing implement, optimizing torque distribution and operation by varying torque and speed throughout the rotation cycle.
Implementation Method 1
A drive train mechanism utilizing a stepless gear system with a spiral radius gear and quarter pinion
Implementation Method 2
combined with a flexible link and springs
Implementation Method 3
combined with a flexible link and springs
Data Source
AI summary
A drive unit that is movable between an unfired and a fired position. The drive unit comprises a handle member, a first drive gear having a first axis of rotation, and a second drive gear, engaged to the first drive gear at a mesh point, and having a second axis of rotation. The mesh point moves with respect to the axes of rotation as the handle member moves from the unfired position to the fired position. The drive unit drives an implement only when it is moved from the unfired position to the fired position.