Motor With Nested Planetary Gears for Compact Steering
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Solution Overview
Problem
Existing motors used in vehicle steering systems require additional space for separate speed reducers, reducing vehicle utilization efficiency.
Innovation Solution
A motor design incorporating two hollow shafts connected using planetary gears with different gear ratios to reduce RPM and assist steering wheel operation, allowing for a compact structure by housing the planetary gears within the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate speed reducer is installed in addition to the motor, then the motor can provide speed reduction function, but the utilization of vehicle space is reduced
Solution Approach 1:
The patent merges the speed reducer and motor into a single integrated unit. The planetary gear mechanism is positioned inside the motor housing, with the sun gear connected to the motor shaft and planetary gears meshing with it. This integration eliminates the need for a separate speed reducer, providing both motor function and speed reduction capability while reducing overall space occupation in the vehicle.
Solution Approach 2:
The patent employs a nested structure where the planetary gear mechanism is placed within the motor housing. The hollow shaft of the motor accommodates the planetary gear components, allowing the speed reduction mechanism to be nested inside the motor structure. This nesting arrangement maximizes space utilization by having one component occupy the internal space of another component.
2Speed
If two planetary gears with different gear ratios are used, then reduced RPM can be applied to the output shaft, but the device complexity increases
Solution Approach 1:
The patent divides the speed reduction function into two separate planetary gear stages, each with different gear ratios. The first planetary gear mechanism provides initial speed reduction, while the second planetary gear mechanism provides additional speed reduction. This segmentation allows for achieving significant overall RPM reduction while maintaining manageable complexity in each individual stage, as each stage can be optimized independently.
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 motor effectively applies reduced RPM to the output shaft, enhancing steering stability and compactness, while protecting the gears from physical and chemical stimuli, thus improving space utilization and operational safety.
Implementation Method 1
a first planetary gear part in contact with an inner circumferential surface of the first shaft, a second planetary gear part in contact with an inner circumferential surface of the second shaft
Implementation Method 2
a rotor coupled to the first shaft, a stator disposed outside the rotor
Data Source
AI summary
One embodiment relates to a motor comprising: a hollow first shaft; a rotor coupled to the first shaft; a stator arranged outside the rotor; a hollow second shaft arranged inside the first shaft; a first planetary gear part which comes in contact with the inner circumferential surface of the first shaft; a second planetary gear part which comes in contact with the inner circumferential surface of the second shaft; and a third shaft for connecting the first planetary gear part and the second planetary gear part, wherein the rotation of the first shaft is decelerated by the first planetary gear part and the second planetary gear part and then delivered to the second shaft. Accordingly, an RPM that is lower than the RPM generated by the output of the motor can be applied to an output shaft of a steering shaft.