Coaxial Left-Right Wheel Drive Layout for Compact Torque Transmission
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Solution Overview
Problem
Existing vehicle driving devices face challenges in reducing the size of the driving device while maintaining sufficient torque transmission to the left and right wheels, due to long power transmission paths and single gear trains that reduce rotation speed and torque difference.
Innovation Solution
A left-right wheel driving device with a reduction gear train that reduces the rotation speed of the motors and a gear mechanism that amplifies the torque difference between the two motors, featuring coaxially disposed motor shafts, counter shafts with intermediate gears, and output shafts with overlapping output gears to achieve a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single gear train is used to reduce rotation speed, then the structure is simplified, but the torque transmission capability is insufficient
Solution Approach 1:
The single gear train is segmented into two independent gear trains, each associated with one motor and one wheel. This allows each gear train to be optimized for torque transmission without compromising the other, resolving the contradiction between structural simplicity and torque capability.
Solution Approach 2:
The patent transitions from a single centralized gear train to two separate gear trains arranged in parallel dimensions. This dimensional change enables independent torque optimization while maintaining overall structural efficiency.
2Device complexity
If power transmission paths are made long to accommodate all components, then all components can be included, but the device size increases
Solution Approach 1:
The power transmission system is segmented into two independent paths, each serving one motor-wheel pair. This segmentation eliminates the need for long centralized transmission paths, reducing overall device length while maintaining complete component integration.
Solution Approach 2:
The patent extracts the unnecessary intermediate transmission components from the power path by directly coupling each motor to its own gear train and wheel, eliminating long transmission paths while retaining all essential components.
3Power
If motors are arranged on the vehicle shaft, then torque transmission is direct, but the device width increases
Solution Approach 1:
The patent rearranges the motor arrangement from a longitudinal configuration (on the vehicle shaft) to a lateral configuration (side by side). This dimensional change maintains direct torque transmission while reducing the device width.
Solution Approach 2:
The patent employs an asymmetric layout where motors are positioned laterally rather than symmetrically on the shaft, enabling compact width while preserving torque transmission efficiency through the redesigned gear mechanism.
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 compact driving device effectively transmits amplified torque differences to the left and right wheels, achieving a balance between size reduction and torque transmission efficiency.
Implementation Method 1
motor shafts that are positioned between the rotating shafts coaxially with the rotating shafts and that are each provided with a motor gear, counter shafts that are disposed in parallel to the motor shafts and that are each provided with a first intermediate gear meshing with the motor gear and a second intermediate gear having a diameter smaller than that of the first intermediate gear, and output shafts that are disposed in parallel to the motor shafts and that are each provided with an output gear meshing with the second intermediate gear
Data Source
AI summary
In a left-right wheel driving device (10) including two motors (1, 2) that drive left and right wheels and a gear mechanism (3) that amplifies a torque difference between the two motors (1, 2) and transmits the amplified torques to the left and right wheels, respective, rotating shafts (1A, 2A) of the two motors (1, 2) are coaxially disposed. The left-right wheel driving device (10) further includes motor shafts (11) that are positioned between the rotating shafts (1A, 2A) coaxially with the rotating shafts (1A, 2A) and that are each provided with a motor gear (21), counter shafts (12) that are disposed in parallel to the motor shafts (11) and that are each provided with a first intermediate gear (22) meshing with the motor gear (21) and a second intermediate gear (23) having a diameter smaller than that of the first intermediate gear (22), and output shafts (13) that are disposed in parallel to the motor shafts (11) and that are each provided with an output gear (24) meshing with the second intermediate gear (23). The gear mechanism (3) is disposed on one end side of each of the output shafts (13) and one of the left and right wheels is disposed on the other end side of the output shaft (13).