Wheel Driving System Torque Sharing
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Solution Overview
Problem
Construction machinery with hybrid driving systems require high torque electric motors, which are large and heavy, leading to decreased fuel and work efficiency due to increased size and weight, and existing systems struggle to efficiently distribute torque loads during high-load operations.
Innovation Solution
A wheel driving system with lightweight and compact front and rear electric motors connected to transmissions with different shift ratios, allowing for conversion of low driving torque into high conversion torque, and a central connection unit to share torque loads between axles, reducing the weight and size of the machinery while maintaining high-load capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If high torque electric motors are used to perform high load work, then the construction machinery can achieve high torque output, but the motors become large and heavy, deteriorating fuel efficiency and work efficiency
Solution Approach 1:
The patent divides the single high-torque motor system into multiple electric motors (front axle motor and rear axle motor), each with lower individual torque requirements. The torque demand is segmented across multiple motors, allowing each motor to be smaller and lighter while collectively providing the necessary high torque output for construction machinery operations.
Solution Approach 2:
The patent combines multiple electric motors with different torque characteristics to achieve the required high torque output. By merging the output of front and rear axle motors, the system achieves high torque capability without requiring each individual motor to be large and heavy, thus resolving the contradiction between torque output and motor weight.
2Productivity
If multiple electric motors are used to drive different wheels, then wheel driving capability is improved, but the system complexity increases and torque load distribution during high-load operations becomes problematic
Solution Approach 1:
The patent introduces a central connection unit as an intermediary component that coordinates torque distribution between the front and rear axle motors. This central unit manages the complex torque load distribution during high-load operations, simplifying the control architecture while maintaining improved wheel driving capability across different operating conditions.
3Strength
If transmissions with different shift ratios are used in front and rear axles, then torque loads are shared effectively and motor stress is reduced, but the transmission system becomes more complex
Solution Approach 1:
The patent applies different transmission characteristics (different shift ratios) to the front and rear axle transmissions based on their specific operational requirements. The front axle transmission and rear axle transmission are optimized with different gear ratios suited to their respective roles, allowing effective torque load sharing and reduced motor stress while maintaining a relatively simple transmission system through localized optimization rather than universal complexity.
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 system improves fuel and work efficiency by using smaller, lighter motors and ensures continuous high-load performance without torque transfer interruptions during shifts, while sharing loads between front and rear axles to reduce motor stress.
Implementation Method 1
a generator connected to an engine and configured to generate electrical energy
Implementation Method 2
a front electric motor configured to produce a driving torque from the electrical energy supplied from the generator
Data Source
AI summary
A wheel driving system includes a generator connected to an engine and configured to generate electrical energy, a front axle configured to drive a front wheel and including a front electric motor configured to produce a driving torque and a front transmission configured to convert the driving torque into a conversion torque and transmit the conversion torque to the front wheel via a front drive shaft, a rear axle configured to drive a rear wheel and including a rear electric motor configured to produce a driving torque and a rear transmission configured to convert the driving torque into a conversion torque and transmit the conversion torque to the rear wheel via a rear drive shaft, and a central connection unit operatively connected to the front drive shaft and the rear drive shaft and configured to transmit the conversion torque between the front axle and the rear axle.