Fastening Tool Layout With Parallel Motor and Driving Axes
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Solution Overview
Problem
Existing fastening tools face limitations in operability and power transmission efficiency due to the configuration of the motor and ball-screw mechanism, where the rotational axis of the motor shaft intersects with the driving axis, leading to suboptimal placement and energy loss.
Innovation Solution
The fastening tool redesigns the motor and fastening mechanism to align the rotational axis of the motor shaft parallel to the driving axis, allowing for closer placement and improved power transmission, with the main handle positioned to enhance user operability by being closer to the driving axis, and includes a brushless DC motor and a planetary-gear speed reducer for efficient energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the motor and ball-screw mechanism are positioned with intersecting axes (rotational axis crossing driving axis), then the structural layout is simplified, but the power transmission efficiency deteriorates and energy loss increases
Solution Approach 1:
The patent transitions from a conventional intersecting-axis configuration to a parallel-axis configuration by changing the spatial dimension of power transmission. The motor shaft rotational axis and ball-screw driving axis are arranged parallel to each other, requiring power transmission in a different spatial dimension, which reduces energy loss while maintaining structural feasibility through the use of bevel gears and intermediate shafts.
2Ease of manufacture
If the motor and fastening mechanism are positioned farther apart, then the structural layout is easier, but the power transmission efficiency deteriorates
Solution Approach 1:
The patent merges the motor and fastening mechanism into a closely integrated assembly with parallel axes, minimizing the distance between power source and execution mechanism. This merging reduces power transmission losses while the use of standard components like bevel gears and intermediate shafts maintains ease of manufacture and assembly.
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 configuration enhances power transmission efficiency and improves user operability by allowing the motor and fastening mechanism to be closer together, reducing energy loss and increasing the tool's compactness while making it easier to grip and use.
Implementation Method 1
a motor, a fastening mechanism, a tool body, and a main handle. The motor includes a motor body and a motor shaft. The motor body includes a stator and a rotor.
Implementation Method 2
includes a brushless DC motor and a planetary-gear speed reducer for efficient energy transfer
Data Source
AI summary
A fastening tool includes a motor, a fastening mechanism, a tool body and a main handle. The motor includes a motor body and a motor shaft. The fastening mechanism is configured to fasten workpieces via a fastener by pulling a pin of the fastener rearward relative to a tubular part of the fastener along a driving axis defining a front-rear direction of the fastening tool. The tool body houses the motor and the fastening mechanism. The main handle extends in a direction crossing the driving axis and connected to the tool body such that the main handle and the tool body together form an annular part. A rotational axis of the motor shaft extends parallel to the driving axis. A portion of the main handle is located in a rear space extending behind the motor body.