Hand-held Power Tool Gearshift Position Detection
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Solution Overview
Problem
Existing hand-held power tools with gear-shifting mechanisms lack reliable and simple methods for detecting the current gear position, leading to potential operational inefficiencies and user confusion when switching between different gear stages.
Innovation Solution
A hand-held power tool design featuring an actuatable switching ring with a position detection unit, including a linear or angle sensor, that allows for safe and reliable detection of the current gear position, coupled with a transmission unit that converts rotational movement into axial displacement for robust gear shifting, and an operating unit for easy gear selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a gear-shifting mechanism is implemented in hand-held power tools, then gear ratio switching capability is improved, but reliable detection of current gear position becomes problematic
Solution Approach 1:
A position detection unit is introduced as an intermediary component between the shift ring and the control system. This unit includes a sensor that detects the angular position of the shift ring and converts it into electrical signals, providing reliable gear position information without interfering with the mechanical gear-shifting operation.
Solution Approach 2:
The patent replaces complex mechanical position detection mechanisms with electronic sensing technology. Instead of using mechanical linkages or switches to detect gear position, an electronic sensor system monitors the angular position of the shift ring and provides electrical signals to indicate the current gear stage.
2Reliability
If mechanical position detection methods are used, then gear position can be detected, but the detection system becomes complex and unreliable
Solution Approach 1:
The patent replaces complex mechanical position detection mechanisms with electronic sensing technology. Instead of using mechanical linkages or switches to detect gear position, an electronic sensor system monitors the angular position of the shift ring and provides electrical signals to indicate the current gear stage.
Solution Approach 2:
The patent changes the detection parameter from mechanical position to electrical signal. By monitoring the angular position of the shift ring and converting it into electrical signals, the system achieves reliable gear position detection with simpler components and better reliability.
3Device complexity
If the shift ring is directly coupled to the detection unit, then position detection is simple, but the detection accuracy and reliability are insufficient
Solution Approach 1:
A position detection unit is introduced as an intermediary component between the shift ring and the control system. This unit includes a sensor that detects the angular position of the shift ring and converts it into electrical signals, providing reliable gear position information without interfering with the mechanical gear-shifting operation.
Solution Approach 2:
The patent replaces complex mechanical position detection mechanisms with electronic sensing technology. Instead of using mechanical linkages or switches to detect gear position, an electronic sensor system monitors the angular position of the shift ring and provides electrical signals to indicate the current gear stage.
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 simple and accurate detection of the current gear position, facilitating uncomplicated switching between gear stages and enhancing user experience by providing clear gear indication and secure operation.
Implementation Method 1
a linear sensor is associated with the position detection unit, which is configured to detect the current detection position of the position detection unit
Implementation Method 2
an angle sensor is assigned to the position detection unit for detecting the current switching position of the actuated switching ring
Implementation Method 3
The actuated switching ring preferably has a cam track connected to the position detection unit, which is configured to axially displace the position detection unit when the actuated switching ring is actuated
Implementation Method 4
the transmission unit has at least one axially displaceable shift rod that connects the axially displaceable ring gear to the actuated shift ring
Data Source
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AI summary
The invention relates to a hand-held power tool (100) having a shiftable gearing (130), with which shiftable gearing a gearshift unit (210) for shifting between at least two different gear stages is associated, wherein the gearshift unit (210) has an actuatable shifting ring (140) and a control unit (180) having a servomotor (182), wherein the servomotor (182) is designed to actuate the actuatable shifting ring (140) for gearshifting between the at least two different gear stages when the servomotor is activated, a position detection unit (160) is associated with the actuatable shifting ring (140), which position detection unit is designed to detect a current shifting position of the actuatable shifting ring (140).