Construction Machine Working Arm Layout for Compact Electric Actuation
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Solution Overview
Problem
The structural complexity of construction machinery is hindered by the need for both linear and rotating mechanisms in existing electrified actuators, making it difficult to simplify the machinery.
Innovation Solution
A construction machine design featuring drive units with fixed drive shafts supporting a boom, arm, and attachment, where the center of the boom is within the width of the arm, and drive mechanisms are positioned to minimize width, allowing for simplified structure and reduced size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If both linear motion mechanism and rotating mechanism are used in electric cylinder, then the construction machine can be electrified, but the structure becomes more complex
Solution Approach 1:
The patent combines the linear motion mechanism and rotating mechanism into a single integrated electric cylinder assembly. The electric motor, reduction mechanism, and linear motion components are merged into one unit that performs both rotational and linear functions, eliminating the need for separate rotating mechanisms and reducing overall structural complexity despite maintaining electrification.
Solution Approach 2:
The electric cylinder is designed as a multi-functional component that simultaneously provides both rotational motion (through the electric motor and reduction mechanism) and linear motion (through the piston rod extension). This universal design allows a single component to replace what would traditionally require multiple separate mechanisms, thereby simplifying the overall construction machine structure.
2Length of moving object
If drive mechanisms are positioned to minimize width, then the construction machine size is reduced, but component alignment becomes more constrained
Solution Approach 1:
The patent positions the drive mechanisms in a compact arrangement that utilizes three-dimensional space efficiently. By arranging components along the longitudinal axis and using vertical stacking where applicable, the design minimizes width while maintaining proper component alignment through spatial optimization rather than simple linear arrangement.
Solution Approach 2:
The drive mechanisms are nested within each other in a compact configuration. The reduction mechanism is housed within the electric motor assembly, and the piston rod is integrated within the cylinder body. This nesting arrangement minimizes the overall width while ensuring that all components maintain their required alignment through precise internal positioning.
Data Source
AI summary
A construction machine includes: a support portion; first to third drive units having first to third drive shafts respectively; a boom having a proximal end portion supported on the support portion via the first drive unit; an arm having a proximal end portion supported on the boom via the second drive unit; and an attachment having a proximal end portion supported on the arm via the third drive unit. The first drive shaft is fixed to a distal end portion of the support portion and the proximal end portion of the boom. The second drive shaft is fixed between a distal end portion of the boom and the proximal end portion of the arm. The third drive shaft is disposed between a distal end portion of the arm and the proximal end portion of the attachment. The center of the boom is situated within the width of the arm.