Coaxial Shear Wrench Layout for Balanced Torque and Tip Ejection
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Solution Overview
Problem
Shear wrench tools cause user fatigue due to the need to counteract the moment of force exerted by the motor and transmission weight, and existing designs complicate the removal of sheared bolt tips.
Innovation Solution
A shear wrench tool with an electric motor, planetary gear transmission, and an ejection mechanism that includes a handle positioned to balance moments of force and a mechanism for rotating output sleeves in opposite directions, along with a spring-actuated ejection system to remove sheared bolt tips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the motor and transmission are positioned at the rear of the tool, then the tool can provide sufficient torque for shearing bolt tips, but the user experiences fatigue due to having to counteract the moment of force created by the weight of these components
Solution Approach 1:
The patent positions the motor and transmission assembly at the rear of the tool, using these heavy components as a counterweight to balance the moment of force created by the front-mounted output section. This counterbalancing arrangement reduces the effort required by the user to control the tool during operation, thereby reducing fatigue while maintaining the necessary torque output.
2Reliability
If the output section is designed to hold the sheared bolt tip, then the tool can complete the shearing function, but the user must manually remove the bolt tip which adds time and reduces efficiency
Solution Approach 1:
The patent incorporates an automatic ejection mechanism that uses the rotational motion of the output section to propel the sheared bolt tip out of the tool. This self-ejecting function eliminates the need for manual removal of the bolt tip, allowing the user to immediately engage the next bolt without interrupting the workflow, thereby increasing productivity while maintaining reliable shearing operation.
3Ease of operation
If a handle is provided at the rear of the tool for user grip, then the tool is controllable, but the handle interferes with the compact axial arrangement of the motor, transmission, and output section
Solution Approach 1:
The patent integrates the handle structure into the existing rear housing that contains the motor and transmission assembly. The handle is nested within or formed as part of the housing structure, allowing the user to grip the tool comfortably without adding separate components that would disrupt the compact axial arrangement of the internal mechanisms.
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
Reduces user fatigue by balancing moments of force and facilitates efficient removal of sheared bolt tips through the ejection mechanism, enhancing usability and efficiency.
Implementation Method 1
the ejection mechanism also having biasing means for urging the first active surface into engagement with the second active surface... the biasing means subsequently urges the first impact part back into engagement with the second impact part for generating an impulse
Implementation Method 2
a transmission having a plurality of planetary gear stages... the electric motor is configured to provide torque via the transmission to the output section
Implementation Method 3
interaction between the first and second active surfaces causes the first impact part to disengage from the second impact part... for generating an impulse which is transferred via the second impact part to a sheared bolt tip
Data Source
AI summary
A shear wrench tool including an electric motor having a motor output shaft, a transmission having a plurality of planetary gear stages and an output section having first and second output sleeves the first output sleeve being configured for mating with a nut and the second output sleeve being configured for mating with a tip of a bolt to be sheared, wherein the electric motor is configured to provide torque via the transmission to the output section for causing the first and second output sleeves to be rotated in opposite directions relative to each other in use, and wherein the electric motor, the transmission and the output section are arranged in an axial sequence one after the other such that the first and second output sleeves circumferentially extend coaxially around the same axis that the motor output shaft and the planetary gear stages rotate about.