Brushless Motor Parallel Shaft Layout for Compact Gear Drive
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Solution Overview
Problem
Conventional brushless motors with a worm speed reducer have an orthogonal rotating shaft and output shaft configuration, leading to a protruding shape that compromises layout properties, particularly requiring left-right symmetric designs for vehicles, which complicates installation and reduces space efficiency.
Innovation Solution
A brushless motor design featuring a parallel rotating shaft and output shaft configuration, allowing for a line-symmetric shape by arranging the motor and gear housings side by side, eliminating left and right attachment directionalities and enhancing layout properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a worm speed reducer is adopted with orthogonal rotating shaft and output shaft, then the motor structure is compact, but the motor part protrudes greatly to the side of the speed reduction part, deteriorating layout properties
Solution Approach 1:
The patent inverts the conventional orthogonal shaft arrangement by adopting a parallel shaft configuration. The rotating shaft and output shaft are arranged parallel to each other instead of orthogonally, which fundamentally changes the motor's external shape from a protruding form to a more compact, symmetric form factor that improves layout properties without sacrificing size efficiency
Solution Approach 2:
The patent eliminates the left-right asymmetry inherent in orthogonal shaft designs. By using parallel shafts with gears meshed laterally, the motor achieves line-symmetric shape about the axis connecting the shafts, allowing identical installation orientations for both right-hand and left-hand drive vehicles
2Device complexity
If orthogonal shaft configuration is used, then the motor structure is simplified, but left-right symmetric shape is required for each vehicle type, complicating installation
Solution Approach 1:
The parallel shaft configuration creates a universal motor design that can be installed in identical orientations for both right-hand and left-hand drive vehicles. The line-symmetric shape about the shaft connection axis allows the same motor unit to serve multiple vehicle configurations without requiring mirror-image variants or complex installation procedures
3Volume of moving object
If orthogonal shaft arrangement is adopted, then the speed reduction mechanism is compact, but the motor part protrudes to the side, reducing space efficiency
Solution Approach 1:
The patent inverts the spatial arrangement by placing gears laterally between parallel shafts rather than using orthogonal worm gears. This lateral gear meshing arrangement consolidates the motor and speed reduction components into a more space-efficient configuration that reduces the area occupied by the motor assembly
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 parallel shaft configuration improves layout efficiency, simplifies installation on both right-hand and left-hand drive vehicles, reduces the motor's size, and increases the magnet size, enabling cost-effective and efficient manufacturing while maintaining performance.
Implementation Method 1
a stator, provided between the rotating shaft and the plurality of magnets in a radial direction of the rotor and wound with a coil
Implementation Method 2
a plurality of magnets, fixed to the side wall and arranged side by side in a circumferential direction of the rotor
Implementation Method 3
a first gear provided on a tip side of the rotating shaft; a second gear, meshed with the first gear
Data Source
AI summary
A brushless motor includes a motor part and a gear part. The motor part includes: a rotating shaft, having a first gear; a rotor, having a bottom wall and a side wall, the bottom wall being fixed to the rotating shaft; magnets, fixed to the side wall and arranged side by side in a circumferential direction of the rotor; a stator, provided between the rotating shaft and the magnets in a radial direction of the rotor and wound with a coil; and a motor housing, rotatably supporting the rotating shaft, and accommodating the rotor and the stator. The gear part includes: a second gear, meshed with the first gear; an output shaft, having an output part, having a base end side thereof fixed to the second gear, and parallel to the rotating shaft; and a gear housing, rotatably supporting the output shaft, and accommodating the second gear.