Rear Housing Motor-Gearing Layout for Electric Work Vehicles
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Solution Overview
Problem
Existing electric work vehicles face challenges in efficiently powering multiple components and ensuring stable operation, particularly in agricultural tractors, due to the complexity and integration of motors and gearing systems, which can lead to inefficiencies and instability.
Innovation Solution
A rear housing design in electric work vehicles that integrates multiple motors and gearings to drive wheels and additional components, with a centralized motor configuration and strategic placement of components to optimize power distribution and stability, including a PTO system and hydraulic pump, while allowing for efficient power transmission and locking mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple motors and gearings are integrated in the rear housing to drive wheels and components, then power distribution efficiency and system stability are improved, but device complexity increases
Solution Approach 1:
The patent integrates 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 associated gearings into a single rear housing structure. This merging of previously separate components into one integrated assembly improves system stability and power distribution efficiency while reducing the number of separate mounting locations needed.
2Volume of moving object
If motors and gearings are positioned with outermost portions inside the motors in left-right direction, then space utilization is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent positions the outermost portions of the gearings inside the motors in the left-right direction, and locates at least a portion of the first and second gearings above the third motor in the up-down direction. This three-dimensional spatial arrangement optimizes space utilization within the rear housing by utilizing multiple dimensions (left-right and up-down) rather than simply extending components linearly.
3Use of energy by moving object
If centralized motor configuration is used to drive multiple components, then power distribution efficiency is improved, but ease of manufacture decreases
Solution Approach 1:
While integrating multiple motors into the rear housing, the patent maintains distinct motor units (first, second, third, and fourth motors) that can be independently manufactured and then assembled into the housing. This segmentation allows each motor to be produced using standard manufacturing processes, while the integrated housing design optimizes power distribution to multiple components (wheels, PTO, hydraulic pump).
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 first electric work vehicle component other than a wheel, the third motor being supported by the rear housing, and a fourth motor to drive a second electric work vehicle component other than a wheel, the fourth motor being supported by the rear housing. The first motor is connected to a first gearing to drive the first rear wheel. The second motor is connected to a second gearing to drive the second rear wheel. An outermost portion of the first gearing is located inside of the first motor in a left-right direction of the vehicle.