Fastening Tool Gear Layout for Compact Reaction Force Support
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Solution Overview
Problem
Existing fastening tools face challenges in compact design due to the need for a receiving part to handle reaction forces, which often increases the tool's length in the front-rear direction.
Innovation Solution
The fastening tool incorporates a receiving member positioned rearward of the gear part, allowing it to receive reaction forces via the gear's rear surface, along with a thrust bearing for smooth rotation and an elastic member for space management, reducing the tool's overall length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the receiving member is disposed rearward of the rear end surface of the rotation member to receive the reaction force, then the reaction force can be properly received, but the length of the fastening tool in the front-rear direction increases
Solution Approach 1:
The receiving member is positioned to receive the reaction force through the gear part's rear surface rather than requiring additional rearward space. This utilizes the radial projection of the gear part to transmit the reaction force, effectively using a different spatial dimension (radial to axial) to resolve the contradiction between strength and length.
Solution Approach 2:
The gear part serves dual functions: transmitting rotational motion to the ball-screw mechanism and simultaneously receiving the reaction force through its rear surface. This multi-functionality eliminates the need for a separate receiving structure, thereby reducing the overall tool length while maintaining reaction force receiving capability.
2Length of moving object
If the receiving member is disposed rearward of the gear part to receive the reaction force via the gear's rear surface, then the length of the fastening tool in the front-rear direction is reduced, but the arrangement complexity increases
Solution Approach 1:
The receiving member is integrated with the gear part such that the gear part's rear surface directly receives the reaction force. This merging of functions into a single structural arrangement simplifies the overall design by eliminating separate receiving components and their associated mounting structures, thereby reducing arrangement complexity despite the compact positioning.
Data Source
AI summary
A fastening tool includes a tool body, an anvil, a pin-gripping part, a motor, a rotation member, a moving member, a gear part and a receiving member. The rotation member is configured to be rotationally driven around the driving axis. The moving member is coupled to the pin-gripping part and engaged with the rotation member. The moving member is configured to move along a driving axis defining a front-rear direction, in response to rotational driving of the rotation member. The gear part is shaped like a flange projecting radially outward from an outer peripheral surface of the rotation member, and has gear teeth on an outer circumference thereof. The receiving member is disposed rearward of the gear part and configured to receive, via a rear surface of the gear part, a rearward reaction force applied to the rotation member when the pin-gripping part moves frontward.