Dual-Motor Hydrostatic Drive for High-Traction Mobile Work Machines
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Solution Overview
Problem
Existing drive systems for mobile work machines face limitations in power delivery due to the electric motor having to drive both a hydrostatic pump and a lifting device, resulting in limited traction force and potential overheating from high current usage.
Innovation Solution
A drive system with two electric motors mounted in series on a common shaft synchronously drives a hydrostatic pump and an actuator hydraulic pump, allowing for increased torque and power without excessive current, and includes a control unit to optimize power distribution between machine movement and lifting arm operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single electric motor drives both the hydrostatic pump and the lifting device, then the device complexity is reduced, but the available power for movement is limited and the electric current becomes excessively high
Solution Approach 1:
The single electric motor is segmented into two separate electric motors, allowing one motor to drive the hydrostatic pump for movement and another motor to drive the lifting device, thereby increasing available power for movement without excessive current
2Device complexity
If a single electric motor drives both the hydrostatic pump and the lifting device, then the device complexity is reduced, but harmful heating occurs due to high current
Solution Approach 1:
The single electric motor is segmented into two separate electric motors, distributing the current load and preventing harmful heating of components while maintaining device functionality
3Device complexity
If the electric motor stops and reverses direction to reverse machine movement, then the mechanical coupling is simple, but the traction force is insufficient at low speeds
Solution Approach 1:
The mechanical coupling system is replaced with a hydrostatic drive system using hydraulic pumps and motors, enabling high traction force at low speeds through hydraulic pressure while maintaining relatively simple device complexity
4Power
If two electric motors are mounted in series on a common shaft, then the total torque and power are increased, but the device complexity increases
Solution Approach 1:
Two electric motors are merged by mounting them in series on a common shaft, combining their torques and powers to drive the hydrostatic pump, thereby increasing total available power while consolidating the configuration into a single drive unit
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 provides high hydrostatic traction force, reduces component wear and overheating, extends service life, and optimizes operation by minimizing motor stops and restarts, while preserving inertia and allowing for efficient power management.
Implementation Method 1
a hydrostatic drive module comprising at least one hydrostatic pump (101) connected to at least one hydrostatic motor (102), the hydrostatic motor (102) being coupled to at least one driving wheel (5a, 5b) of the mobile work machine to drive rotation of the at least one driving wheel (5a, 5b)
Implementation Method 2
at least two electric motors (105, 106) for driving the hydrostatic pump (101), the two electric motors (105, 106) and the hydrostatic pump (101) being mounted in series on a common main shaft (104) to be driven in rotation synchronously
Data Source
AI summary
The invention relates to a drive system (100) for a mobile work machine, the drive system (100) including a hydrostatic drive module including at least one hydrostatic pump (101) connected to at least one hydrostatic motor (102), the hydrostatic motor (102) being coupled to at least one driving wheel (5a) of the mobile work machine in order to rotate the at least one driving wheel (5a), and at least two electric motors (105, 106) for driving the hydrostatic pump (101), the two electric motors (105, 106) and the hydrostatic pump (101) being mounted in series on a common main shaft (104) for synchronous rotation thereof.