Transverse Drive Assembly With Parallel Shafts and Two-Stage Reduction
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Solution Overview
Problem
Existing power systems in heavy-duty vehicles face challenges with high cost, large size, low power density, and limited battery capacity due to the use of high torque motors and longitudinal arrangements, as well as inefficiencies in transverse arrangements with multiple gears and bearings.
Innovation Solution
A transverse drive assembly comprising a power source, transmission mechanism with parallel shafts, and a reduction mechanism using a sun gear, planetary carrier, and clutches to achieve high transmission ratios with a two-stage structure, reducing the need for large torque sources and optimizing space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a high torque motor and single speed reducer are used to meet high torque output and high vehicle speeds, then the requirements for torque and speed are satisfied, but the cost increases and power density decreases due to large motor size
Solution Approach 1:
The power system is segmented into two independent motors (first motor for high torque, second motor for high speed) instead of using one large high-torque motor. This segmentation allows each motor to be optimized for its specific function, reducing overall system complexity and improving power density while meeting both torque and speed requirements.
2Ease of manufacture
If the power system is arranged longitudinally, then the layout is simple, but it occupies large space at the bottom of the vehicle, resulting in limited battery pack space and reduced continuous driving mileage
Solution Approach 1:
The power system arrangement is changed from longitudinal (length direction) to transverse (width direction). This dimensional change allows the power system to occupy horizontal space instead of vertical space, freeing up the vehicle bottom for battery pack installation and increasing continuous driving mileage while maintaining layout simplicity.
3Power
If parallel shaft two-stage transmission or three-stage transmission is used in transverse arrangement to achieve high speed ratio output, then high torque output at high speed is achieved, but the structure becomes complex with too many gears and bearings, increasing assembly envelope, reducing efficiency, and increasing cost
Solution Approach 1:
The transmission system is segmented into two independent single-speed reducers, each driven by its own motor. This eliminates the need for complex multi-stage transmissions with multiple gears and bearings, reducing structural complexity, assembly envelope, and cost while maintaining the capability to deliver high torque at high speed through coordinated motor operation.
Solution Approach 2:
The functions of two separate power systems (high-torque motor-reducer combination and high-speed motor-reducer combination) are merged into a single transverse drive assembly, sharing common structural elements like the housing and output shaft, thereby reducing overall complexity while achieving both high torque and high speed capabilities.
Data Source
Figure 1
Figure 2
AI summary
A transverse drive assembly is disclosed. The transverse drive assembly comprises a power source (1), a transmission mechanism (2), and a reduction mechanism (3). The transmission mechanism (2) comprises a first shaft (4) and a second shaft (5) arranged in parallel. The first shaft (4) is connected to the power source (1) for transmission. The first shaft (4) is provided thereon with a first gear (6) and a third gear (7), and the second shaft (5) is provided thereon with a second gear (8) and a fourth gear (9). The first gear (6) is meshed with the second gear (8) for transmission, and the third gear (7) is meshed with the fourth gear (9) for transmission. The first gear (6) is rotationally connected to the first shaft (4) for transmission through a clutch or the second gear (8) is rotationally connected to the second shaft (5) for transmission through a clutch, and the third gear (7) is connected to the first shaft (4) for transmission through a clutch or the fourth gear (9) is connected to the second shaft (5) for transmission through a clutch. The reduction mechanism (3) is sleeved on the second shaft (5) and connected to the differential (10) for transmission. The transverse drive assembly has the advantages of small envelope, light weight, low cost, and high efficiency.