Excavator Battery Layout for Low Center of Gravity
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Solution Overview
Problem
The conventional positioning of a battery above the electric motor and hydraulic pump in a hydraulic excavator leads to a high center of gravity, making it difficult to maintain a good machine body balance, especially when using a large-capacity battery unit.
Innovation Solution
The electric working machine is designed with the battery unit arranged on a turning frame in the upper turning body, and the electric motor positioned above the battery unit, maintaining a low center of gravity and ensuring a stable machine body balance even with large-capacity batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the battery is positioned above the electric motor and hydraulic pump in the upper turning body, then the battery can be easily installed in the upper turning body, but the center of gravity of the hydraulic excavator becomes high, making it difficult to maintain a good machine body balance
Solution Approach 1:
The patent inverts the conventional arrangement by positioning the battery below the electric motor and hydraulic pump. Specifically, the battery is arranged on the upper turning body at a position lower than the electric motor and hydraulic pump, which lowers the center of gravity and improves machine body balance while still allowing easy installation within the upper turning body structure
2Use of energy by moving object
If a large-capacity battery unit is used to increase energy storage, then the energy storage capacity is improved, but the machine body balance becomes more difficult to maintain due to the heavy battery
Solution Approach 1:
The patent applies the inversion principle by positioning the large-capacity battery unit below the electric motor and hydraulic pump rather than above. This arrangement ensures that even with increased battery capacity and weight, the center of gravity remains low, thereby maintaining good machine body balance while achieving the required energy storage capacity
Data Source
AI summary
A hydraulic excavator as an electric working machine includes: a lower traveling body; an upper turning body that is positioned above the lower traveling body and provided to be turnable with respect to the lower traveling body; an electric motor that is arranged in the upper turning body; and a battery unit that is arranged in the upper turning body and stores electric power for driving the electric motor. The upper turning body includes a turning frame at a bottom. The battery unit is arranged on the turning frame. The electric motor is arranged above the battery unit.