Planetary Electric Transmission for Independent Wheel Torque Control
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Solution Overview
Problem
Traditional gasoline and diesel vehicles emit greenhouse gases, and there is a need for more efficient and flexible transmission systems in electric vehicles to meet the increasing demand for electric vehicles and equipment.
Innovation Solution
Variable electric transmission systems that allow independent control of individual wheels and torque multiplication through a conjoined design with a moment offset supported by bearings, enabling efficient speed control and torque management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional transmission systems are used in electric vehicles, then the design is simpler, but the efficiency and flexibility are insufficient to meet increasing demand
Solution Approach 1:
The transmission system is divided into multiple independent gear systems (first gear system with gears 1-3, second gear system with gears 4-6), each capable of independent operation. This segmentation allows flexible configuration where only necessary gear systems need to be engaged, improving efficiency while maintaining manageable complexity through modular design
Solution Approach 2:
The first rotary input serves multiple functions by being coupled to both the first gear and the fourth gear, allowing a single input source to control multiple gear systems. This multi-functionality improves productivity by enabling versatile operation modes without proportionally increasing device complexity
2Adaptability or versatility
If independent wheel control is implemented, then the flexibility and performance are enhanced, but the control complexity increases
Solution Approach 1:
The transmission system provides independent rotational outputs (first rotary output and second rotary output) that can be controlled separately through different gear systems. This segmentation enables independent wheel control for enhanced adaptability in electric and hybrid vehicles while keeping the control architecture manageable through clear separation of control paths
Solution Approach 2:
The system allows dynamic adjustment of operational modes by selectively engaging different gear systems and configuring speed relationships. The controller can dynamically switch between various operational states (neutral, forward, reverse) based on driving conditions, enhancing versatility without requiring permanently complex control mechanisms
3Power
If torque multiplication is achieved through moment offset, then the power delivery is improved, but the mechanical complexity increases
Solution Approach 1:
The system employs asymmetric gear configurations where gears of different sizes are engaged at specific ratios. The first gear system and second gear system use different gear combinations to achieve torque multiplication, leveraging asymmetric mechanical advantages to improve power delivery while maintaining reasonable structural complexity
Solution Approach 2:
The planetary gears act as intermediary elements between the input rotary inputs and the output rotary outputs. These intermediate gear mechanisms facilitate torque multiplication by providing mechanical advantage through their gear ratios, improving power delivery while keeping the overall mechanical structure organized and manageable
4Speed
If multiple gear systems are used for speed control, then the speed range and precision are improved, but the manufacturing complexity increases
Solution Approach 1:
The transmission system is divided into separate, modular gear systems (first gear system with gears 1-3, second gear system with gears 4-6) that can be manufactured and assembled independently. This segmentation improves speed control precision by allowing optimized gear ratios in each system while reducing manufacturing complexity through modular production and assembly
Solution Approach 2:
The system uses standard spur gears and conventional gear configurations throughout both gear systems. By maintaining homogeneity in the types of gears used (spur gears, planetary gears), the manufacturing process is simplified while still achieving precise speed control through different gear ratios and configurations
Data Source
AI summary
A planetary gear system for setting a drive ratio of a transmission includes an outer ring gear; a plurality of planetary gears; an inner sun gear; a first rotary input coupled to one of the outer ring gear, the plurality of planetary gears, and the inner sun gear; a second rotary input coupled to another one of the outer ring gear, the plurality of planetary gears, and the inner sun gear; and a rotary output coupled to a remaining one of the outer ring gear, the plurality of planetary gears the inner sun gear. In some cases, the planetary gear system is combined with a second planetary gear system, and the first rotary input of the planetary gear system and the first rotary input of the second planetary gear system are the same, allowing generation of two independent outputs from three inputs.