Rear Housing Layout for Multi-Motor Electric Work Vehicles
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Solution Overview
Problem
Existing electric work vehicles lack an efficient and integrated system for powering multiple components such as rear wheels, Power Take-Off (PTO), and hydraulic systems, which can lead to complexity and reduced performance.
Innovation Solution
The electric work vehicle incorporates a rear housing that supports four motors: two for rear wheels, one for PTO, and one for a hydraulic pump, all of which are liquid cooled and connected to respective gearings, ensuring efficient power distribution and lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple motors and gearings are integrated in the rear housing, then system complexity is reduced and power distribution efficiency is improved, but the device complexity increases due to the need for integrated lubrication and cooling systems
Solution Approach 1:
The patent combines multiple motors (first motor for left rear wheel, second motor for right rear wheel, third motor for PTO, fourth motor for hydraulic pump) and their corresponding gearings into a single rear housing, creating an integrated power distribution system that reduces overall system complexity while improving efficiency
Solution Approach 2:
The rear housing serves multiple functions simultaneously: it houses the motors and gearings, provides lubrication through a unified oil sump, and implements liquid cooling for all four motors through a common cooling system, demonstrating multi-functionality that resolves the technical contradiction
2Reliability
If gears are positioned to contact lubrication oil, then lubrication effectiveness is improved, but the risk of oil contamination and gear submersion issues increases
Solution Approach 1:
The patent positions the uppermost oil surface at a specific location in the up-down direction so that the gears of at least two gearings contact the lubrication oil when the vehicle is horizontal, providing localized lubrication exactly where needed without submerging all components
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
This configuration enables efficient power distribution to multiple components, enhances performance by ensuring proper lubrication of gears, and simplifies the system by integrating key functions within the rear housing.
Implementation Method 1
Each of the first motor, the second motor, the third motor, and the fourth motor are liquid cooled
Implementation Method 2
Each of the first motor, the second motor, the third motor, and the fourth motor are liquid cooled
Implementation Method 3
Each of the first through fourth motors is connected to respective ones of first through fourth gearings which include gears axially aligned with the first through fourth motors. An uppermost oil surface of the lubrication oil is provided at a location in an up-down direction
Data Source
AI summary
An electric work vehicle includes a rear housing, a first motor to drive a first rear wheel, the first motor being supported by the rear housing, a second motor to drive a second rear wheel, the second motor being supported by the rear housing, a third motor to drive a Power Take-Off (PTO) through a PTO input shaft connected to the third motor, the third motor being supported by the rear housing, and a fourth motor to drive a hydraulic pump, the fourth motor being supported by the rear housing. Each of the first motor, the second motor, the third motor, and the fourth motor are liquid cooled. The rear housing houses a lubrication oil. Each of the first through fourth motors is connected to respective ones of first through fourth gearings which include gears axially aligned with the first through fourth motors.