Portable Rescue Tool Gearbox Layout for High Torque at Lower Weight
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Solution Overview
Problem
Existing rescue tools, such as 'Jaws of Life' devices, are heavy, inefficient, and have poor heat dissipation, making them difficult to handle and operate effectively for emergency rescues, particularly in extricating accident victims from vehicles.
Innovation Solution
A portable rescue tool powered by an electric motor with an angle rotary gearbox that increases torque and reduces speed, combined with a single belt drive and a clutch mechanism, which reduces weight and improves heat dissipation, allowing for easier manipulation and extended motor life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional rescue tools are used to provide high torque spreading and cutting motion, then the required spreading and closing forces of 7,000 to 15,000 pounds can be achieved, but the tools become very heavy and difficult to handle
Solution Approach 1:
The patent replaces traditional heavy mechanical hydraulic systems with an electric motor-driven system. The electric motor (12) coupled with a gearbox (14) and belt drive (56) provides the necessary torque through electrical power conversion, eliminating the need for heavy hydraulic pumps and fluid systems while maintaining the required 7,000 to 15,000 pounds of spreading and closing forces at the jaws.
Solution Approach 2:
The patent changes the power transmission parameters by using a gearbox (14) with specific gear ratios to multiply the motor's rotational speed into high torque output. The belt drive system (56) with sprockets (38, 52) further transmits this torque to the actuator arms (102, 104), optimizing the force output while keeping the system weight low compared to traditional hydraulic systems.
2Force
If traditional rescue tools operate under high loads, then the required spreading and closing forces can be generated, but heat dissipation becomes poor and motor life is reduced
Solution Approach 1:
The electric motor system generates less heat compared to hydraulic systems under high load conditions. The electric motor (12) converts electrical energy directly to mechanical work with higher efficiency, reducing waste heat. Additionally, the electric system allows for better thermal management through electronic control and cooling mechanisms, extending motor life during prolonged high-force operations.
3Force
If traditional rescue tools are designed for high torque output, then the required spreading and closing forces can be achieved, but the tools become complex and expensive to manufacture
Solution Approach 1:
The patent simplifies the overall system by replacing complex hydraulic mechanisms with an electric motor-driven belt drive system. The electric motor (12), gearbox (14), and belt drive (56) create a more straightforward power transmission path with fewer components, reducing manufacturing complexity and cost while maintaining the capability to generate 7,000 to 15,000 pounds of force through the actuator arms (102, 104).
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 portable rescue tool provides increased efficiency, reduced weight, and improved heat dissipation, enabling effective high-torque operations with reduced user fatigue and extended tool longevity.
Implementation Method 1
The angle rotary gear box has an output shaft that is oriented about 90 degrees from the rotational axis of the motor output shaft and is geared so as to increase the torque and reduce the speed of the rotational power
Implementation Method 2
That high torque is then transmitted by a single belt drive to a main rotary actuator
Implementation Method 3
The braking assembly brakes the motor shaft when the power to the motor is terminated and allows the motor shaft to rotate freely when the motor is being energized
Data Source
AI summary
A portable rescue tool that is powered by an electric motor. The electric motor has a drive output shaft that transfers rotational power to an angle rotary gearbox. The angle rotary gearbox has an output shaft that is oriented about 90 degrees from the rotational axis of the motor output shaft and is geared so as to increase the torque and reduce the speed of the rotational power. The angle rotary gearbox provides a reduced speed, high torque output at an output shaft that is delivered by a single chain drive to a main rotary actuator where two actuator arms are controlled to move away from each other and toward each other in the operation of the rescue tool. The portable rescue tool is designed to be of a low weight and enhanced cooling properties as present rescue tools.