Reduction Drive Motor Radial Orientation
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Solution Overview
Problem
Conventional reduction drive devices for electric vehicles are bulky, prone to electric motor vibration, and have limited noise/vibration controllability due to the electric motor's protrusion from the casing.
Innovation Solution
The internal functional parts of the electric motor overlap with the distribution mechanism in the rotation radius direction, reducing the device's size, preventing motor vibration, and enhancing noise/vibration controllability by eliminating protrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the electric motor is fastened to the motor joint of the casing with conventional configuration, then the motor can be securely fixed, but the motor extremely protrudes from the casing in axial direction enlarging the total size of the device
Solution Approach 1:
The patent applies dimensional change by allowing the motor to protrude in the radial direction rather than the axial direction. The motor shaft is positioned such that it protrudes from the casing in the radial direction, while the motor body is contained within the casing. This dimensional reorientation resolves the contradiction by reducing axial length without compromising motor fixation security.
2Reliability
If the electric motor protrudes from the motor joint in axial direction, then the motor can be installed, but it easily causes the electric motor to vibrate
Solution Approach 1:
The patent reorients the motor protrusion from axial to radial direction. The motor shaft protrudes radially from the casing while the motor body remains contained within the casing. This dimensional change eliminates the excessive axial protrusion that causes vibration, thereby improving motor stability without increasing overall device volume.
3Object-affected harmful factors
If the electric motor protrudes from the casing, then the motor can be connected to the drive system, but there is a limit in noise/vibration controllability
Solution Approach 1:
The patent changes the protrusion direction from axial to radial. The motor shaft protrudes radially from the casing while the motor body is contained within the casing boundaries. This dimensional reorientation improves noise and vibration controllability by eliminating excessive axial protrusion without increasing device volume.
4Volume of moving object
If internal functional parts of the electric motor overlap with the distribution mechanism in rotation radius direction, then the total size of the device is reduced, but the components may interfere with each other
Solution Approach 1:
The patent applies nesting by positioning the motor shaft within the distribution mechanism's rotational path. The motor shaft is arranged to overlap with the distribution mechanism in the radial direction, allowing compact integration. The motor shaft is supported by bearings that are integrated into the distribution mechanism structure, enabling space-efficient component arrangement without interference.
Solution Approach 2:
The patent uses dimensional reorientation to achieve overlapping component arrangement. By positioning the motor shaft to protrude radially and overlap with the distribution mechanism in the radial direction, the patent achieves compact device size. The bearing support structure is designed to accommodate this overlapping arrangement, maintaining component stability through proper structural integration.
Data Source
AI summary
A reduction drive device is compact, hardly causes an electric motor thereof to vibrate, and has improved noise/vibration controllability. The reduction drive device includes the electric motor attached to a casing and capable of outputting torque, first and second reduction mechanisms supported by the casing, to reduce and transmit the rotational output of the electric motor, and a rear differential supported by the casing, to distribute the rotational output reduced by the first and second reduction mechanisms to a pair of axle shafts. Rotor, stator, and brush of the electric motor partly overlap the rear differential when seen in a rotation radius direction.