Double Helical Gear Layout for Lower Vibration Power Transmission
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Solution Overview
Problem
In power transmission mechanisms with multiple double helical gears on a single rotary shaft, mutual interference of axial behaviors leads to deterioration in vibrations and noise due to hindered aligning actions.
Innovation Solution
A power transmission mechanism is designed with a first shaft, a second shaft, and a third shaft, where the second double helical gear has tooth portions offset in phase, and the third double helical gear has identical phase tooth portions, counterbalancing axial forces and reducing interference, allowing for easier double-sided contact and reduced vibrations and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple double helical gears are provided on a single rotary shaft, then power transmission capability is improved, but axial forces interfere with each other and hinder aligning actions, causing deterioration in vibrations and noise
Solution Approach 1:
The patent applies different phase relationships to different tooth portions of double helical gears based on their local requirements. Specifically, one double helical gear has tooth portions that are offset in phase, while another has tooth portions that are identical in phase. This local differentiation allows each gear to generate axial forces in opposite directions that counterbalance each other, resolving the interference problem while maintaining power transmission capability.
2Object-affected harmful factors
If double helical gears have offset tooth portions, then meshing compelling force is scattered and vibrations are reduced, but axial behavior becomes unbalanced and interferes with aligning actions
Solution Approach 1:
The patent uses the axial forces generated by different double helical gears as counterbalancing forces. By configuring one gear with offset tooth portions and another with identical tooth portions, the axial forces produced by each gear act in opposite directions, effectively counterbalancing each other. This eliminates the net axial behavior that would otherwise interfere with aligning actions, while still benefiting from the vibration-reducing effect of scattered meshing forces.
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 effectively suppresses axial behavior of the third double helical gear, preventing it from hindering the aligning action of the second double helical gear, thereby reducing vibrations and noise in the power transmission system.
Implementation Method 1
the axial forces are produced in opposite directions and counterbalanced by each other. Therefore, the axial behavior of the third double helical gear can be suppressed
Implementation Method 2
The double helical gears move in an axial direction due to this axial force, so an aligning action for establishing double-sided contact between the double helical gears is effective at the meshing portion. Thus, the level of vibrations and noise can be made lower in the double helical gears than in spur gears
Data Source
AI summary
A power transmission mechanism equipped with a first shaft including a first double helical gear, a second shaft including a second double helical gear and a third double helical gear arranged in alignment with the second double helical gear in an axial direction, and a third shaft including a fourth double helical gear that meshes with the third double helical gear. The second double helical gear includes a pair of right and left tooth portions whose torsional directions are reverse to each other such that the left tooth portion and the right tooth portion are offset in phase from each other, and the third double helical gear includes a pair of right and left tooth portions whose torsional directions are reverse to each other such that the left tooth portion and the right tooth portion are identical in phase to each other.