Electric Excavator Battery Placement for Stable Upper Body Balance
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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 battery unit is arranged on a turning frame at the bottom of the upper turning body, with the electric motor positioned above it, maintaining a low center of gravity and ensuring a stable machine body balance.
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 becomes high making it difficult to maintain good machine body balance
Solution Approach 1:
The patent inverts the conventional arrangement by positioning the battery at the bottom of the upper turning body instead of above the electric motor and hydraulic pump. This inversion resolves the technical contradiction by achieving both easy installation (through standardized bottom mounting) and good machine body balance (through low center of gravity positioning).
2Duration of action of moving object
If a large-capacity battery unit is used to increase operating time, then the operating duration is improved, but the machine body balance becomes more difficult to maintain due to increased weight and height
Solution Approach 1:
The patent changes the vertical dimension arrangement by positioning the battery horizontally at the bottom of the upper turning body rather than vertically above the motor and pump. This dimensional reorganization allows large-capacity battery units to be installed while maintaining a low center of gravity, thus achieving both extended operating time and good machine body balance.
3Device complexity
If the battery is positioned at the rear end of the upper turning body, then the battery can be compactly arranged, but the center of gravity becomes high affecting machine stability
Solution Approach 1:
The patent adopts a standardized bottom-mounting configuration for the battery that can be replicated across different machine sizes and models. This copying approach enables compact arrangement through systematic layout while maintaining low center of gravity positioning, thereby achieving both arrangement compactness and machine stability.
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.