Compact Impact Tool Axial Length Reduction
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Solution Overview
Problem
Conventional impact tools are too long for use in narrow spaces, making them difficult to handle and impractical for certain applications.
Innovation Solution
The impact tool design features a reduced axial length, with the length from the rear end of the motor housing to the front end of the anvil being less than 128 mm, achieved through innovative configurations such as omitting the conventional pin retaining washer and optimizing the placement of components like the internal gear and anvil washer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pin retaining washer is used to secure the planetary gear pin, then the pin is reliably retained, but the axial length of the tool increases
Solution Approach 1:
The patent removes the separate pin retaining washer component from the conventional design. Instead, the pin is retained through the interaction between the engaging part on the spindle and the engaged part on the pin itself, eliminating the need for an additional washer and thereby reducing the axial length of the tool.
Solution Approach 2:
The patent integrates the pin retention function directly into the pin structure and spindle engagement mechanism. The engaged part on the pin and the engaging part on the spindle work together to provide retention, merging the retention function with the existing components rather than requiring a separate washer component.
2Ease of operation
If the axial length is reduced to improve handling in narrow spaces, then ease of operation improves, but maintaining adequate tightening torque becomes more difficult
Solution Approach 1:
The patent optimizes the radial and vertical arrangements of components within the hammer case. By repositioning the internal gear, anvil washer, and other components in different spatial dimensions, the design achieves adequate tightening torque while reducing the axial length, allowing the tool to be handled in narrow spaces.
Solution Approach 2:
The patent modifies various dimensional parameters of the components, such as the thickness of the anvil washer, the positioning of the internal gear, and the overall axial dimensions. These parameter changes enable the tool to maintain sufficient tightening torque capability while achieving a compact axial length for improved handling.
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 design enhances handling properties, allowing the impact tool to be used in tight spaces while maintaining adequate tightening torque, thus improving usability in locations where larger tools are impractical.
Implementation Method 1
a coil spring for urging the hammer
Data Source
AI summary
An impact driver or impact tool includes a motor, a motor housing that houses the motor, a grip housing integrally provided with the motor housing, a hammer case is disposed frontward of the motor housing, a spindle rotated by the motor, a hammer housed inside the hammer case and configured to be rotated by the spindle, and an anvil housed inside the hammer case which anvil is configured to be impacted by the hammer. In this impact driver, a length from a rear end of the motor housing to a front end of the anvil (i.e., the front-rear length of a main body) is less than 128 mm.