Portable Torque Wrench Gear Shifting for Fast Tightening and High Torque
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Solution Overview
Problem
Existing torque power tools for industrial applications face challenges with slow driving speed, large size, and limited portability, requiring high torque values, and lack intuitive usability and durability, while also being costly and inefficient.
Innovation Solution
A portable torque power tool with a yoke-style shifter assembly, Hall effect sensor, and modular architecture, featuring a dual-speed mode, wireless connectivity, and improved gearboxes for efficient torque control and enhanced usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If high torque values are generated from small portable tools using large gear reduction ratios, then torque output is improved, but driving speed becomes quite slow
Solution Approach 1:
The patent implements a dynamic speed/torque mode selector that allows the operator to switch between high-speed/low-torque mode and low-speed/high-torque mode. This is achieved through a reconfigurable planetary gear system with two selectable reduction ratios (first and second reduction ratios), enabling the tool to adapt its characteristics based on operational requirements rather than being fixed in one state.
Solution Approach 2:
The system changes the gear reduction ratio parameter dynamically by selecting between two different planetary gear configurations. The mode selector switch changes the effective reduction ratio from a first ratio (for high speed) to a second ratio (for high torque), allowing optimization of parameters based on the specific task at hand.
2Measurement precision
If handheld torque power tools are designed for torque accuracy, then measurement precision is improved, but driving speed becomes relatively slow
Solution Approach 1:
The patent implements a dynamic speed/torque mode selector that allows the operator to switch between high-speed/low-torque mode and low-speed/high-torque mode. This is achieved through a reconfigurable planetary gear system with two selectable reduction ratios (first and second reduction ratios), enabling the tool to adapt its characteristics based on operational requirements rather than being fixed in one state.
3Power
If external power sources are used to power torque tools, then power output is improved, but tool size increases and portability decreases
Solution Approach 1:
The patent describes a hydraulically driven torque tool that utilizes hydraulic pressure from an external hydraulic system rather than requiring a large internal combustion engine or electric motor. The hydraulic motor converts hydraulic energy to mechanical rotation, providing high torque output in a compact form factor suitable for portable applications.
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 tool achieves high-speed operation, reduced size, increased portability, and improved durability, with intuitive user interface and expanded functionality, enhancing efficiency and reliability in industrial bolting tasks.
Implementation Method 1
a Hall effect sensor and a shifter ring gear
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A portable torque power tool is disclosed herein and includes: a motor to generate a turning force; a drive to transfer the turning force; a turning force multiplication mechanism assembly to multiply the turning force; a shifter assembly to shift the tool between a lower speed / higher torque (LSHT) mode and a higher speed / lower torque (HSLT) mode; a torque transducer to measure torque output from a portion of the turning force multiplication mechanism assembly; wherein torque output is controlled by the torque transducer in LSHT mode; and wherein torque output is controlled by motor current in HSLT mode.