Dual-Motor Planetary Drive Layout for Compact Working Machines
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Solution Overview
Problem
Drive devices for working machines, such as tractors and wheel loaders, require efficient and reliable operation across various ground conditions and working cycles, often necessitating complex and bulky mechanical and hydraulic components when powered by internal combustion engines.
Innovation Solution
A drive device comprising two electric motors with motor shafts, an inverter for each motor, and a compact driving transmission with a planetary gearset, allowing for flexible power distribution to multiple power take-off shafts and all-wheel drive, enabling efficient operation and modular adaptation to different customer specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If internal combustion engine is used to power working machine, then sufficient power and torque can be delivered, but complex and bulky mechanical and hydraulic components are required
Solution Approach 1:
The patent replaces the internal combustion engine with two electric machines (motors) that directly generate mechanical power. This substitution eliminates the need for complex mechanical transmission components such as clutches, torque converters, and multi-speed transmissions, while still delivering sufficient drive power and torque to the working machine.
Solution Approach 2:
The two electric machines are designed to perform multiple functions: they can independently or cooperatively drive the drive wheels, power take-off shafts, and hydraulic pumps. This multi-functionality reduces the need for separate dedicated components for each function, thereby simplifying the overall mechanical system.
2Adaptability or versatility
If internal combustion engine with hydraulic components is used, then various ground conditions and working cycles can be handled, but the system becomes bulky and complex
Solution Approach 1:
The patent replaces hydraulic power transmission with direct electric drive systems. The two electric machines can independently control power distribution to drive wheels and hydraulic pumps, eliminating the need for bulky hydraulic pumps, hoses, and control valves while maintaining adaptability to various ground conditions and working cycles through electronic control.
Solution Approach 2:
The electric machines provide dynamic and flexible power distribution that can be rapidly adjusted through electronic control to match varying ground conditions and working cycles. This dynamic adaptability replaces the static hydraulic system while reducing component volume.
3Device complexity
If two electric machines are used for power distribution, then flexible and compact power transmission is achieved, but control complexity increases
Solution Approach 1:
The patent uses electronic control systems to manage the two electric machines, replacing complex mechanical control mechanisms. The inverter units and control electronics provide precise, automated control of power distribution, motor speed, and torque, simplifying the mechanical structure while managing control complexity through software-based solutions.
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 solution provides efficient, flexible, and compact power transmission with reduced mechanical complexity, allowing for simultaneous operation of multiple accessories and all-wheel drive, optimizing structural space and operational efficiency.
Implementation Method 1
The electric machines can be designed to convert electrical energy into mechanical energy
Data Source
AI summary
A drive device for a working machine includes a first electric machine with a first motor shaft, a second electric machine with a second motor shaft, a first drive output shaft, a first power take-off shaft, and a second power take-off shaft. A transmission has an input shaft, an output shaft, a driving planetary gearset with a sun gear, a planetary carrier, and a ring gear, a driving shifting element, and a brake, where the sun gear is permanently connected rotationally fixed to the input shaft, and the planetary carrier is connected rotationally fixed to the output shaft. The first motor shaft can be connected to the first drive output shaft via the transmission. The second motor shaft can be connected to the first power take-off shaft and to the second power take-off shaft. The ring gear can be immobilized and the driving planetary gearset can be blocked.