Electric Construction Machine Battery Layout for Compact Superstructures
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Solution Overview
Problem
Existing electric construction machines face challenges in achieving a compact, lightweight design while ensuring flexible component installation, stable operation, and efficient component orientation, particularly due to restrictions imposed by the arrangement of the electric motor and hydraulic pump, which often require complex designs and bracing.
Innovation Solution
The electric energy storage device is oriented obliquely to the longitudinal axis of the superstructure, allowing for off-center placement and creating free space for other components, with bracing extending parallel to the energy storage device's main axis to enhance stability and simplify design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the electric motor and hydraulic pump are arranged vertically to achieve compact length and width, then the height of the superstructure is utilized effectively, but the orientation of these components is restricted and complex contacting and routing of hydraulic lines is required
Solution Approach 1:
The patent transitions from vertical arrangement to oblique arrangement of the energy storage device, utilizing a three-dimensional angular orientation rather than strict vertical alignment. This dimensional change allows hydraulic lines to be routed more directly between components, reducing routing complexity while maintaining compact footprint.
2Stability of the object's composition
If bracing is added to increase stability in the superstructure, then stability is improved, but the construction becomes more complex and weight increases
Solution Approach 1:
The energy storage device is arranged obliquely rather than symmetrically or vertically, creating an asymmetric configuration that naturally integrates with the bracing structure. This asymmetric placement allows bracing to extend along the energy storage device in a straight line without kinks, simplifying the bracing design while maintaining stability.
Solution Approach 2:
The bracing structure is merged with the energy storage device arrangement, where the bracing extends parallel to and along the energy storage device. This integration combines the structural support function with the spatial utilization of the energy storage device, reducing the need for separate bracing elements.
3Ease of operation
If heavy components are arranged close to and evenly distributed about the center point of the slewing ring, then gentle and smooth rotational function is achieved, but achieving a compact arrangement of components becomes more difficult
Solution Approach 1:
The patent changes the angular parameter of the energy storage device orientation to oblique relative to the longitudinal axis of the superstructure. This parameter change allows the center of gravity to be positioned off-center in plan view while maintaining adequate vertical distribution, achieving smooth rotation without requiring strict central alignment.
4Stability of the object's composition
If the energy storage device is arranged centrally to achieve uniform weight distribution, then weight distribution is improved, but free space for other components is reduced
Solution Approach 1:
The energy storage device is oriented obliquely in three-dimensional space rather than being placed centrally in the horizontal plane. This spatial reorientation creates free space on one side of the superstructure while maintaining adequate weight distribution through vertical positioning, allowing other components to be arranged in the available space.
Data Source
AI summary
An electric construction machine has a working unit and a superstructure. An electric motor for driving a drive train and/or the working unit and an electric energy storage device for supplying the electric motor with electric energy are arranged in the superstructure. In order to allow flexible installation of the components located in the superstructure despite a compact, simple and weight-saving design, without compromising stability and construction machine operation, a main axis of the energy storage device of the electric energy storage device extends obliquely to the longitudinal axis of the superstructure.