Common Shaft Motor Pump Assembly for Portable Rescue Tools
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Solution Overview
Problem
Traditional high-power tools, such as rescue tools, face challenges in achieving self-contained and portable designs while maintaining performance comparable to hose-connected tools, requiring compact integration of pumps, motors, and hydraulic fluid reservoirs, along with efficient cooling and operation speed.
Innovation Solution
The tool incorporates a pump and motor arranged directly adjacent on a common singular shaft without intervening couplings or transmissions, with a fluid reservoir that includes heat transfer material in thermal contact with the motor and pump, and a controller that adapts the motor and valve operations based on performance sensors and detectors to optimize force and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pump and motor are integrated into a self-contained tool, then portability and self-containment are improved, but the device size and complexity increase
Solution Approach 1:
The patent merges the pump and motor onto a single common shaft, eliminating the need for separate mounting structures and reducing overall device size. The pump and motor are integrated into a unified assembly that shares common components such as bearings and sealing arrangements, thereby improving portability while controlling complexity growth.
Solution Approach 2:
The patent employs a nested arrangement where the pump is positioned within or adjacent to the motor housing, and both are mounted on the same shaft. This nested configuration allows compact packaging of multiple functional components within a reduced envelope volume, addressing the portability requirement without excessive complexity increase.
2Device complexity
If the pump and motor are arranged on a common shaft without transmission, then device complexity is reduced, but speed control flexibility is limited
Solution Approach 1:
The patent incorporates a variable speed drive system that dynamically adjusts the motor rotational speed to match the optimal speed requirements of the pump under varying operating conditions. This dynamic control compensates for the lack of mechanical transmission, maintaining speed control flexibility while keeping the mechanical structure simple.
Solution Approach 2:
The patent changes the operational parameters by using an electronically controlled motor that can vary its rotational speed and torque output. This parameter adjustment capability provides the necessary adaptability for different operating conditions without requiring complex mechanical transmissions or multiple shafts.
3Ease of operation
If the fluid reservoir is added for self-contained operation, then self-containment is improved, but cooling capability and device size are affected
Solution Approach 1:
The patent introduces a heat exchanger as an intermediary component between the fluid reservoir and the motor/pump assembly. This heat exchanger efficiently transfers heat from the hydraulic fluid to the surrounding environment or cooling medium, maintaining effective cooling capability while accommodating the additional reservoir volume needed for self-containment.
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 configuration enables a compact, efficient, and adaptable tool that maintains performance comparable to traditional systems, allowing for portable and self-contained operation with enhanced cooling and adaptive control of force and speed.
Implementation Method 1
the fluid reservoir comprises heat transfer material and is arranged in thermal contact with at least one of the motor and the pump
Data Source
AI summary
A tool includes at least one motor, and a pump connected to the motor, a work cylinder in fluid connection with the pump and an actuable tool component connected to the work cylinder. The pump and the motor are arranged directly adjacent on a common singular motor and pump shaft, without any intervening coupling, transmission or the like. An assembly of a motor and a pump on a common shaft.