Electric Work Vehicle Motor-Pump Layout for Lower Transmission Loss
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Solution Overview
Problem
Existing electric work vehicles face high motive power transmission loss and increased manufacturing costs due to the arrangement of the motor and hydraulic pump, which are relatively far apart, and the need for a dedicated member to support the hydraulic pump.
Innovation Solution
The electric work vehicle design includes a motor, hydraulic pump, and a case where the motor and hydraulic pump are positioned close to each other, with the hydraulic pump supported by the case, reducing the need for a dedicated support component and using a transmission path that is relatively short.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the motor and hydraulic pump are arranged far apart, then the layout flexibility is improved, but the motive power transmission loss increases
Solution Approach 1:
The patent combines the motor and hydraulic pump into a single integrated assembly where the pump is directly coupled to the motor output shaft. This merging eliminates the need for separate mounting structures and long transmission paths, thereby reducing motive power transmission loss while maintaining layout flexibility through the modular nature of the integrated unit.
2Stability of the object's composition
If a dedicated member is provided to support the hydraulic pump, then the structural stability is improved, but the manufacturing cost increases
Solution Approach 1:
The hydraulic pump is directly coupled to the motor output shaft, merging the support function into the motor structure itself. This eliminates the need for separate dedicated support members, reducing the number of parts and assembly steps, thereby lowering manufacturing cost while maintaining structural stability through the rigid direct coupling.
Solution Approach 2:
The motor output shaft serves multiple functions: it drives the hydraulic pump and simultaneously provides structural support for the pump mounting. This multi-functionality eliminates the need for separate support members, reducing manufacturing complexity and cost while maintaining structural integrity.
3Loss of energy
If the motor and hydraulic pump are positioned close to each other, then the motive power transmission loss is reduced, but the accessibility for maintenance deteriorates
Solution Approach 1:
The patent segments the power transmission system into a modular integrated assembly that can be independently removed and serviced. The close positioning of motor and pump within the assembly maintains short transmission paths, while the modular design allows the entire assembly to be accessed as a unit, facilitating maintenance without compromising accessibility.
Data Source
AI summary
An electric work vehicle includes a work implement, a battery, a motor driven by electric power supplied by the battery, a traveler driven by the motor, a hydraulic pump that is driven by the motor to supply oil to an operating mechanism of the work implement, a transmission to transmit motive power from the motor to the hydraulic pump, and a case that houses the transmission. The case is coupled to the motor, and the hydraulic pump is supported by the case.