Modular Accommodation Box for Work Vehicle Inverter Assembly
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Solution Overview
Problem
Existing work vehicles, such as electric grass mowers, face challenges in the assembly and protection of high-voltage electrical equipment, requiring extensive man-hours and costs for individual electric shock, dust, and water protection measures, while also complicating the assembly process.
Innovation Solution
A modular design featuring an accommodation box that houses multiple high-voltage electrical components, including inverters, which can be easily attached and detached from the vehicle body, allowing for simultaneous protection measures and reducing the complexity of assembly and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If high-voltage electrical equipments are assembled individually with the vehicle body, then assembly flexibility is maintained, but assembly readiness and maintenance efficiency deteriorate
Solution Approach 1:
The patent segments the high-voltage electrical equipments into a separate detachable module (accommodation box) that can be independently assembled and detached from the vehicle body. This module includes the inverter, battery, and associated components, allowing the module itself to be assembled as a complete unit before attachment to the vehicle, thereby improving assembly readiness without increasing overall system complexity.
Solution Approach 2:
The patent introduces an intermediary structure (the accommodation box with mounting brackets and connection interfaces) that mediates between the high-voltage electrical equipments and the vehicle body. This intermediary allows for standardized, simplified attachment and detachment procedures, improving assembly efficiency while maintaining the ability to service individual components within the module.
2Reliability
If individual protection measures are provided for each high-voltage electrical equipment, then protection effectiveness is ensured, but man-hours and costs increase
Solution Approach 1:
The patent merges multiple protection functions (electric shock protection, dust protection, water protection) into a single integrated accommodation box structure. The box provides unified shielding and environmental protection for all high-voltage components within it, eliminating the need to apply separate protection measures to each individual component, thereby reducing both time and cost while maintaining comprehensive protection effectiveness.
3Ease of repair
If high-voltage electrical equipments are mounted separately, then individual access for maintenance is achieved, but assembly and maintenance efficiency deteriorate
Solution Approach 1:
The patent segments the maintenance process into two levels: module-level replacement (high efficiency) and component-level servicing (accessed by detaching the module). The accommodation box is designed as a self-contained maintenance unit that can be quickly detached and replaced, providing high productivity for routine maintenance while still allowing access to individual components when needed through the detachable module approach.
Solution Approach 2:
The patent makes the accommodation box dynamically detachable and reattachable, allowing the maintenance approach to adapt to the specific need. For routine maintenance or replacements, the entire module can be quickly detached and serviced externally. For internal component repairs, the module can be detached and opened to provide access, combining the benefits of both fixed and removable mounting approaches.
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 modular approach simplifies the assembly and maintenance of high-voltage equipment, saves man-hours and costs by enabling unified protection measures, and reduces power loss and costs through shorter high-voltage cables and effective heat dissipation using the accommodation box's wall-face forming member as a heat sink.
Implementation Method 1
effective heat dissipation using the accommodation box's wall-face forming member as a heat sink
Data Source
AI summary
A work vehicle includes a battery that outputs a DC power, at least two electric motors, and at least two inverters, each inverter being configured to convert the DC power from the battery into an AC power and to supply the AC power to one of the electric motors. The work vehicle further includes an accommodation box attachable/detachable to/from the vehicle body, the accommodation box accommodating a plurality of electrical equipments including the inverters.