Electric Scooter Output Gear With Spline Fit for Stable Wheel Torque
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Solution Overview
Problem
The rotation of the driving wheels in electric scooters is not stable due to clearance issues between the output shaft and the wheels, leading to errors and affecting the final rotation speed.
Innovation Solution
An output gear and wheel system for electric scooters featuring external and internal splines that directly transfer torque, ensuring stable and precise rotation through a fitting connection between the output gear and wheel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an output shaft directly drives the wheel to rotate, then the structure is simple, but the output stability is insufficient due to wear and interference between the output shaft and wheel
Solution Approach 1:
The patent introduces a gear as an intermediary component between the output shaft and the wheel. The output shaft drives the gear, which in turn drives the wheel through meshing engagement. This intermediary gear ensures stable torque transmission and maintains precise rotational relationship, eliminating the direct contact issues between output shaft and wheel while preserving structural simplicity.
Solution Approach 2:
The patent replaces the direct mechanical connection (output shaft directly driving wheel) with a gear meshing mechanism. This substitution transforms the direct contact mechanical system into an indirect engagement system through gear teeth, which provides more stable torque transmission and reduces wear and interference problems.
2Reliability
If a gear is introduced between the output shaft and wheel, then the output stability improves, but the device complexity increases
Solution Approach 1:
The gear component performs multiple functions simultaneously: it transmits torque from the output shaft, maintains precise rotational relationship through meshing engagement, and provides stable output to the wheel. By consolidating these functions into a single gear component, the patent achieves high output stability without proportionally increasing overall device complexity.
3Ease of manufacture
If the output shaft directly connects to the wheel, then the manufacturing is simple, but clearance errors affect rotation speed precision
Solution Approach 1:
The gear acts as an intermediary that eliminates clearance errors between the output shaft and wheel. The gear teeth meshing engagement provides precise positional relationship, ensuring accurate rotation speed transmission without the clearance issues that would affect precision in a direct connection system.
Solution Approach 2:
The patent replaces the direct mechanical connection with a gear meshing system, which inherently provides more precise rotational relationship. The gear teeth engagement maintains consistent center distance and eliminates clearance-induced errors, improving rotation speed precision while remaining manufacturable using standard gear manufacturing processes.
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 solution enhances stability and precision of the rotation by eliminating clearance-induced errors, improving the speed reduction and sensitivity of the electric scooter.
Implementation Method 1
the external spline and internal spline are in fitting connection... the external spline teeth of the external spline are fitted with the internal spline tooth spaces of the internal spline
Data Source
AI summary
The present invention relates to an output gear, a wheel and a driving device for an electric scooter, and to the electric scooter. The output gear for an electric scooter comprises a gear having teeth and tooth spaces, an external spline securely connected to the center of a gear face of the gear, wherein the external spline has external spline teeth and external spline tooth spaces, shaft holes are defined in centers of the gear and the external spline. The gear directly outputs torque after speed reduction to the wheel by means of a connection structure of the external spline and the internal spline, so that a final output is more stable, the problem in a conventional electric scooter that the rotation of the scooter's wheel is affected due to a clearance between the output shaft and the wheel is alleviated, the speed reduction precision and sensitivity are consequently improved.