Nut Runner Core Runout Prevention Mechanism
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Solution Overview
Problem
Existing nut runners experience backlash and axis deviation due to clearance between the socket and socket holder, leading to difficulty in positioning the socket when used horizontally, as the socket inclines with respect to the center axis.
Innovation Solution
A nut runner design incorporating a slide mechanism unit, a pushing unit, and a supporting unit with opposing opening and closing claws and ball rollers to securely hold and rotate the socket, preventing core runout and facilitating easy positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bearing is provided on the inner surface of the socket holder to prevent backlash, then backlash is reduced, but clearance still remains between the socket and socket holder causing the socket to incline with respect to the center axis
Solution Approach 1:
A support unit is introduced as an intermediary component between the socket holder and the socket. This support unit includes support protrusions that engage with recesses in the socket, providing additional support to prevent the socket from inclining due to its weight, thereby eliminating core runout while maintaining the bearing's backlash prevention function
Solution Approach 2:
The solution moves from a single-dimensional approach (bearing on inner surface) to a multi-dimensional approach by adding support protrusions that extend axially from the socket holder to engage with the socket's recesses, providing support in multiple directions to prevent inclination
2Adaptability or versatility
If the socket is made relatively long to accommodate different nut dimensions, then versatility is improved, but clearance increases causing core runout and positioning difficulty
Solution Approach 1:
The support unit acts as a mediator that compensates for the clearance inherent in long sockets. By providing additional support points through the support protrusions and recesses engagement, the system maintains positioning accuracy despite the increased length required for versatility
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
The design effectively prevents core runout and allows for easy positioning and rotation of the socket, even when used horizontally, enhancing maintenance by enabling easy socket replacement.
Implementation Method 1
a supporting unit for supporting a socket retained by the socket holder while allowing a nut runner driving unit to rotate and axially move the socket
Data Source
AI summary
A nut runner which comprises a socket holder attached to a tip end of an output shaft, a slide mechanism unit for extending and retracting the output shaft in the axial direction, a pushing unit for pushing the output shaft toward the tip end side in the axial direction, during a screw tightening operation, in cooperation with the slide mechanism unit, and a supporting unit for supporting a socket retained by the socket holder while allowing a nut runner driving unit to rotate and axially move the socket.