Telescopic Boom Electrical Drive Mechanism for Mobile Crane
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Solution Overview
Problem
Conventional mobile cranes with telescopic booms are limited in design flexibility due to the spatial requirements of hydraulic actuators and circuits, and their performance is unstable in low temperature environments due to varying hydraulic oil viscosity.
Innovation Solution
A work machine with a telescopic boom system that uses an electrical drive source and biasing mechanisms to control the connection and disconnection of boom elements, eliminating the need for hydraulic circuits and improving design flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hydraulic actuator is used as the pin insertion/removal actuator, then the telescopic boom can be operated, but the design freedom around the telescopic boom is limited and the system becomes heavier
Solution Approach 1:
The patent replaces the hydraulic actuator system with an electric motor-driven mechanism. The electric motor (231) drives a screw mechanism (223, 224) that converts rotational motion into linear motion for pin insertion and removal. This substitution eliminates the need for hydraulic pumps, valves, and fluid circuits, thereby improving design freedom and reducing system complexity around the telescopic boom.
Solution Approach 2:
The patent extracts and removes the hydraulic circuit components from the telescopic boom system. By eliminating the hydraulic pump, valves, and fluid distribution network that were previously required around the boom structure, the design gains spatial freedom and the overall system becomes lighter and simpler.
2Ease of operation
If a hydraulic actuator is used as the pin insertion/removal actuator, then the telescopic boom can be operated, but the weight of the system increases
Solution Approach 1:
The patent replaces the heavy hydraulic actuator system with a lighter electric motor-driven mechanism. The electric motor (231) combined with a compact screw mechanism (223, 224) provides the necessary force for pin insertion and removal without requiring the heavy hydraulic pump, reservoir, valves, and fluid lines that would otherwise be needed.
Solution Approach 2:
The patent extracts and removes the hydraulic system components that contribute significantly to the overall weight. By eliminating the hydraulic pump, fluid reservoir, valves, and distribution network, the telescopic boom system achieves weight reduction while maintaining operational capability.
3Adaptability or versatility
If hydraulic oil is used for actuation, then the system can operate in various conditions, but the viscosity varies with temperature causing unstable operation time and malfunction in low temperature environments
Solution Approach 1:
The patent replaces the hydraulic oil-based actuation system with an electric motor-driven mechanism. The electric motor (231) with its electronic control system provides consistent performance across a wide temperature range without being affected by fluid viscosity changes. The screw mechanism (223, 224) converts electrical energy directly into mechanical motion, eliminating the temperature-dependent viscosity issues inherent in hydraulic systems.
Solution Approach 2:
The patent changes the actuation mechanism from hydraulic (fluid-based) to electric (solid-state), fundamentally altering the physical parameters of the system. This parameter change from hydraulic oil viscosity-dependent operation to electric motor performance enables stable and predictable operation across varying temperature conditions.
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
The solution enhances design freedom and reliability of the telescopic boom system, particularly in low temperature conditions, by eliminating hydraulic system limitations and stabilizing operational performance.
Implementation Method 1
a first biasing mechanism that biases the first fixing pin to maintain a connection state between the telescoping actuator and the first boom
Data Source
AI summary
This work machine includes: a telescoping actuator that moves a first boom in the telescoping direction with respect to a second boom; an electrical drive source that is disposed in a movable portion of the telescoping actuator; a first connection mechanism that switches a connection state between the telescoping actuator and the first boom on the basis of the power of the electrical drive source; a second connection mechanism that switches a connection state between the first boom and the second boom on the basis of the power of the electrical drive source; and a control device that controls operation of the electrical drive source. The control device executes motor assist processing of operating the electrical drive source when the first fixing pin and/or the second fixing pin is restored by biasing force.