Power Tool Clutch Wear Prevention via Mode Detection
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Solution Overview
Problem
Existing power tools face issues with wear and durability due to halfway engagement of clutch teeth when switching between driving modes, leading to accelerated wear and reduced durability.
Innovation Solution
Incorporating a mode switching member, detecting part, and indicating part to alert users of halfway mode selections, preventing operation in drive prohibited states by detecting and indicating such conditions, thereby ensuring proper mode selection and preventing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mode switching member is operated to switch the claw clutch between power transmission state and power transmission interrupted state, then the driving mode of the hammer bit can be switched between hammer drill mode and hammer mode, but the clutch teeth may be in halfway engagement causing accelerated wear and decreased durability
Solution Approach 1:
The patent employs a detecting part that monitors the position of the mode switching member and provides feedback signals. When the switching member is in a halfway position (not properly engaged in either hammer mode or hammer drill mode), the detecting part generates a detection signal that prevents the clutch from engaging, thereby avoiding halfway engagement and the associated wear and durability issues.
Solution Approach 2:
The patent introduces an intermediary control mechanism between the mode switching member and the clutch engagement. The control part acts as an intermediary that receives the detection signal from the detecting part and accordingly controls the clutch to prevent engagement when the mode switching member is in an invalid position, thus protecting the clutch teeth from wear.
2Ease of operation
If the clutch teeth are engaged in halfway state when mode selection is incomplete, then the power tool can be operated, but acceleration of wear and decrease of durability occurs
Solution Approach 1:
The patent implements preliminary detection of the mode switching member position before allowing clutch engagement. The detecting part checks whether the switching member is in a valid position (properly aligned with either hammer mode or hammer drill mode markings) before enabling the clutch to engage. This preliminary action prevents halfway engagement and extends clutch service life.
Solution Approach 2:
The detecting part provides real-time feedback on the position of the mode switching member. When the switching member is not properly positioned, the feedback signal prevents clutch engagement, ensuring that the clutch teeth are only engaged when the mode selection is complete and correct, thereby extending the clutch's service life.
3Loss of information
If the mode switching member is not placed in normal driving mode position, then the clutch teeth are in halfway engagement, but the user may not be aware of this state leading to improper operation
Solution Approach 1:
The patent uses the detecting part to continuously monitor the position of the mode switching member and provide feedback information. When the switching member is in an invalid position (halfway between modes), the detecting part generates a detection signal that is processed by the control part to prevent clutch engagement, ensuring the user is aware of the improper state and cannot operate the tool in an incorrect mode.
Solution Approach 2:
The patent replaces reliance on purely mechanical visual indicators with an electronic detection and control system. The detecting part uses sensors or switches to electronically detect the position of the mode switching member, and the control part uses electronic control to prevent clutch engagement when the position is invalid, providing more reliable information feedback than mechanical indicators alone.
Data Source
AI summary
An improved power tool is provided which can alert a user of any halfway selection of a driving mode of a tool bit. A representative power tool is provided which is capable of switching among driving modes different in driving state of a tool bit 119. The power tool has a mode switching member 163 that switches among the driving modes, a detecting part 181 that detects a drive prohibited state in which any of the driving modes of the tool bit 119 is not selected, and indicating parts 189, 191 that indicate a result detected by the detecting part 181.