Axial Battery Impact Wrench Layout for High-Torque Deep Reach
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Solution Overview
Problem
Conventional battery-powered impact wrenches with a pistol-type configuration are unsuitable for large, high-torque applications, particularly for tightening and loosening heavy truck wheel fasteners, due to the placement of the battery at the bottom of the handle, which limits their size and control.
Innovation Solution
A non-pistol type impact wrench design with the main handle located behind the output drive, batteries positioned between the motor and handle, and a motor oriented in the same axial direction as the output drive, allowing for a narrow cross-sectional profile and enhanced portability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the battery is located at the bottom of the handle in a pistol-type configuration, then the tool is easier to control for smaller applications, but the tool size and torque capability are limited for large impact tools
Solution Approach 1:
The patent repositions the battery from the bottom of the handle to the rear of the tool, changing the spatial arrangement from a vertical pistol-grip configuration to a horizontal alignment. This dimensional reconfiguration allows the battery to be positioned between the motor and handle without interfering with handle control, while enabling larger motor and battery sizes for high torque applications.
2Force
If the battery is positioned between the motor and handle in a non-pistol configuration, then the tool achieves higher torque capability for large impact applications, but the cross-sectional profile increases reducing portability
Solution Approach 1:
The patent positions the battery in the rear of the tool along the longitudinal axis, between the motor and handle, rather than expanding the cross-sectional area. This longitudinal arrangement maintains a narrow cross-profile suitable for deep-reach operations while accommodating large battery and motor components for high torque generation.
3Force
If the motor and battery are positioned to provide high torque output, then the tool is suitable for heavy truck wheel fasteners, but the tool length and reach capability are affected
Solution Approach 1:
The patent arranges the motor and battery components along the longitudinal axis of the tool, with the battery positioned between the motor and handle. This linear arrangement optimizes the distribution of component lengths, allowing sufficient motor size for high torque while maintaining adequate reach for deep-reach operations such as accessing truck wheel fasteners.
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
Enables effective use in high-torque applications by providing a compact, portable, and easily maneuverable impact wrench suitable for deep-reach operations, without the need for external power sources.
Implementation Method 1
a motor oriented in the same axial direction as the output drive
Implementation Method 2
the hammer may be biased forward toward the anvil by a spring
Implementation Method 3
The battery may be located between the motor and the handle
Data Source
AI summary
An impact wrench is provided with a battery to power the motor. The impact wrench provides improved portability since the impact wrench does not need to be connected to an electrical extension cord or a pneumatic hose. The output drive, motor, batteries and main handle may be aligned along the axial direction of the tool. The batteries may be located between the motor and the main handle.