Impact Rotary Tool Isolator Prevents Circuit Board Contamination
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Solution Overview
Problem
Impact rotary tools face operational instability due to conductive abrasion powder adhering to circuit boards, which can make non-conductive parts conductive, destabilizing the tool's operation.
Innovation Solution
Incorporating an isolator, such as a housing, to isolate contact portions between the hammer and anvil from the circuit board, effectively confining abrasive powder and preventing it from adhering to the circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hammer and anvil contact portions are exposed, then the impact mechanism can function properly, but abrasive powder adheres to the circuit board making non-conductive parts conductive and destabilizing operation
Solution Approach 1:
The housing is segmented into multiple portions: a first housing covering the hammer and anvil contact portions, a second housing covering the circuit board, and a third housing covering the motor. This segmentation isolates the abrasive powder generation zone from the sensitive electronic components, preventing powder adhesion while maintaining impact functionality.
Solution Approach 2:
The housing structures act as intermediary barriers between the hammer-anvil contact portions and the circuit board. These housings physically separate the two regions, preventing direct contact between abrasive powder and the circuit board, thus maintaining electrical insulation and operational stability.
2Reliability
If a housing covers the circuit board to prevent powder adhesion, then operational stability improves, but device complexity increases
Solution Approach 1:
The housing structure serves multiple functions simultaneously: it protects the circuit board from abrasive powder, provides structural support for mounting components, and maintains the overall tool geometry. This multi-functionality reduces the need for additional separate protective components, thereby limiting the increase in device complexity.
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 solution effectively suppresses the adhesion of abrasive powder to the circuit board, ensuring stable operation of the impact rotary tool and protecting additional components like the control circuit and wireless communication circuit.
Implementation Method 1
The hammer is configured to receive rotational force around an axis from the motor and output striking rotational force. The striking rotational force is obtained by converting part of the rotational force into impact force around the axis.
Implementation Method 2
The sensor is disposed in a vicinity of the anvil and is configured to sense a change in a state of the anvil, the change being according to the striking rotational force.
Data Source
AI summary
An impact rotary tool includes a motor, a hammer, an anvil, a sensor, a circuit board, and an isolator. The hammer is configured to receive rotational force around an axis from the motor and output striking rotational force which is obtained by converting part of the rotational force into striking force around the axis. The anvil to which a tip tool is to be attached is configured to rotate, together with the tip tool, around the axis in response to the striking rotational force received from the hammer. The sensor is disposed in a vicinity of the anvil and is configured to sense a change in a state of the anvil, the change being according to the striking rotational force. The circuit board is configured to receive a sensing result by the sensor. The isolator isolates contact portions of the hammer and the anvil from at least the circuit board.