Electric Drive Telescopic Boom Joint for Work Machine Design Freedom
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Solution Overview
Problem
The existing designs of telescopic booms in work machines, particularly cranes, have a reduced degree of freedom due to the reliance on hydraulic systems, limiting design flexibility and operational capabilities.
Innovation Solution
The implementation of an electric drive system with a joint that allows both drive-side and driven-side elements to rotate together or independently, enabling the telescopic boom to extend and retract using an actuator, an electric drive source, and an operating unit, thereby reducing dependence on hydraulic circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hydraulic circuit is provided around the telescopic boom to operate hydraulic actuators, then the telescopic boom can be extended and retracted, but the degree of freedom in design around the telescopic boom is reduced
Solution Approach 1:
The patent extracts the hydraulic circuit from the telescopic boom structure and relocates it to the turntable. This separation removes the constraint that hydraulic lines imposed on the boom's design freedom, allowing the boom to be configured more flexibly without being bound by hydraulic routing requirements.
Solution Approach 2:
The patent replaces the traditional hydraulic actuation system with an electric drive system consisting of an electric motor, transmission mechanism, and pin moving mechanism. This substitution eliminates the need for hydraulic circuits around the boom, thereby improving design freedom while maintaining the telescopic function.
2Adaptability or versatility
If a hydraulic actuator is used to move boom connecting pins and cylinder connecting pins, then the telescopic boom can be operated, but the design flexibility is limited by the hydraulic system requirements
Solution Approach 1:
The patent replaces hydraulic actuators with an electric motor-driven transmission mechanism and pin moving mechanisms. This substitution eliminates hydraulic lines and associated components, providing greater design flexibility in arranging the telescopic boom structure without being constrained by hydraulic routing.
Solution Approach 2:
The patent extracts the actuation function from hydraulic components and implements it through an electric drive system. The electric motor and transmission mechanism are positioned on the turntable, separating the actuation system from the boom structure itself, thereby freeing the boom design from hydraulic system constraints.
3Productivity
If hydraulic circuits are placed around the telescopic boom, then the actuators can be supplied with pressure oil, but the operational capabilities and design freedom are reduced
Solution Approach 1:
The patent replaces the hydraulic circuit arrangement with an electric drive system comprising an electric motor, transmission mechanism, and pin moving mechanisms. This substitution improves operational efficiency by eliminating hydraulic fluid dynamics constraints while simplifying the overall system arrangement and increasing design freedom.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the design flexibility and operational efficiency of telescopic booms by allowing for more precise control and reduced hydraulic system complexity, improving the overall performance and versatility of work machines.
Implementation Method 1
an electric drive source that is provided in the actuator and drives using power supplied from a power source
Implementation Method 2
a joint that has a drive-side element fixed to a first transmission shaft and a driven-side element fixed to a second transmission shaft, the joint being able to take a transmission state in which both the drive-side element and the driven-side element rotate
Data Source
Figure 1
Figure 2A~2F
Figure 3A~3B
AI summary
A work machine includes: an actuator that extends and retracts a telescopic boom; an electric drive source that is provided in the actuator and drives using power supplied from a power source; an operating unit that operates based on power of the electric drive source; and a joint that has a drive-side element fixed to a first transmission shaft that rotates on the basis of the power of the electric drive source and a driven-side element fixed to a second transmission shaft connected to the operating unit, the joint being able to take a transmission state in which both the drive-side element and the driven-side element rotate and a non-transmission state in which only either the drive-side element or the driven-side element rotates.