Electric Work Vehicle Motor Layout and Power Distribution
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Solution Overview
Problem
Existing electric work vehicles face challenges in efficiently powering multiple components and wheels, requiring a robust and efficient motor configuration to enhance performance and versatility.
Innovation Solution
The electric work vehicle incorporates a rear housing that supports four motors: two for rear wheels and two for additional components like a Power Take-Off (PTO) and hydraulic systems, with a gear casing housing gears between the motors and wheels, allowing for efficient power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple motors are added to power various components and wheels, then the vehicle's performance and versatility are enhanced, but the device complexity increases
Solution Approach 1:
The patent divides the power distribution system into four independent motors, each dedicated to a specific function (left rear wheel, right rear wheel, PTO, hydraulic pump). This segmentation allows each motor to be optimized for its specific task while maintaining overall system versatility, resolving the contradiction by making the complexity manageable through functional separation.
Solution Approach 2:
The rear housing serves as a universal platform that supports multiple different motors and components (wheels, PTO, hydraulic system). This multi-functional design allows a single structural element to accommodate diverse power distribution needs, enhancing versatility without proportionally increasing overall device complexity.
2Adaptability or versatility
If four motors are housed in the rear housing, then power distribution to multiple components is enabled, but the housing space requirements increase
Solution Approach 1:
The patent utilizes the vertical dimension within the rear housing by positioning the PTO motor above the output shaft and arranging motors at different heights and locations. This three-dimensional spatial arrangement allows four motors to be accommodated in a compact footprint, enabling comprehensive power distribution without excessive horizontal space requirements.
Solution Approach 2:
The gear casing is positioned within or integrated with the rear housing structure, creating a nested arrangement where the gear casing houses the gear mechanisms for the driven wheels while the rear housing provides the outer framework. This nesting allows efficient use of space by placing components within the structural boundaries of each other.
3Productivity
If gears are placed between motors and wheels, then efficient power transmission is achieved, but the gear casing complexity increases
Solution Approach 1:
The gear casing is merged with the rear housing structure, where the rear housing provides the outer framework and the gear casing provides the internal gear mechanisms. This combination integrates the gear transmission system with the motor mounting structure, achieving efficient power transmission while minimizing the addition of separate complex components.
Data Source
Figure 1A
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Figure 1C
AI summary
An electric work vehicle 1 includes a rear housing 12, a gear casing 1200, a first motor 18 to drive a first rear wheel 4L, a second motor 20 to drive a second rear wheel 4R, a third motor 22 to drive a first electric work vehicle component other than a wheel, and a fourth motor 24 to drive a second electric work vehicle component other than a wheel. The first motor 18, the second motor 20, the third motor 22 and the fourth motor 24 are each supported by the rear housing 12, which is wider than the gear casing 1200 in a left-right direction of the electric work vehicle 1. The rear housing 12 houses the first motor 18, the second motor 20, the third motor 22, and the fourth motor 24. The gear casing 1200 houses first gears and second gears.