Impact Tool Spindle Layout Balancing Axial Length and Torque
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Solution Overview
Problem
Existing impact tools face challenges in achieving a balance between axial length and maximum tightening torque, which affects work efficiency and ergonomics.
Innovation Solution
The impact tool is designed with a configuration that includes a motor, spindle, hammer, and anvil, where the distance between the rear-end portion of the motor housing and the front-end portion of the anvil is 97 mm or less, optimizing the dimensions and ratios of structural elements to achieve a combination of shortening the axial length and increasing the maximum tightening torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the axial length of the impact tool is shortened, then the ergonomics and work efficiency are improved, but the maximum tightening torque may be reduced
Solution Approach 1:
The patent repositions the spindle from a conventional location to a forward position relative to the motor, and arranges the hammer and anvil in a compact configuration. This spatial reconfiguration in the axial dimension allows the tool to achieve both short axial length (97 mm or less) and high maximum tightening torque (230 N·m or more) simultaneously, resolving the contradiction between ergonomics and force output
2Productivity
If the axial length of the impact tool is shortened, then the work efficiency is improved, but the maximum tightening torque may be reduced
Solution Approach 1:
The patent optimizes critical dimensional parameters including the axial length (97 mm or less), the position of the spindle relative to the motor, and the configuration of the hammer and anvil. By precisely controlling these parameters, the design achieves both short axial length for improved work efficiency and sufficient maximum tightening torque (230 N·m or more) for effective fastening operations
Data Source
AI summary
An impact tool (1) includes: a motor (4); a spindle (6), which is disposed forward of the motor and is rotated by the motor; a hammer (33), which is supported by the spindle; an anvil (8), which is impacted in a rotational direction by the hammer, a motor housing (14), which houses the motor; a grip housing (15), which extends downward from the motor housing; and a battery-holding housing (16), which is disposed at a lower-end portion of the grip housing and holds a battery pack (43) having a rated voltage of 18 V. The distance (Da) between a rearward-most edge of the motor housing and a frontward-most edge of the anvil is 97 mm or less.