Axial Bolt Head Absorbs Bus Bar Displacement
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Solution Overview
Problem
Conventional bolt support structures in electrical junction boxes often cause the bus bar to lift and bend during fastening, leading to stress concentration and defective attachment due to inadequate absorption of displacement.
Innovation Solution
A bolt support structure with a head portion that can move axially with respect to the mount portion, sandwiching the bus bar and terminal clamp between the head and nut, and featuring a large-diameter and small-diameter portion design with a notch and gap configuration to absorb displacement and prevent bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the connection portion of the bus bar is designed to contact the outer surface of the mount portion, then the bus bar can be mounted on the frame, but the connection portion may lift up and detach during fastening, causing bending and stress concentration
Solution Approach 1:
The bolt head is designed to move axially relative to the mount portion during fastening, allowing the connection portion to maintain contact without lifting. This dynamic adjustment prevents bending and stress concentration while ensuring reliable attachment.
Solution Approach 2:
The bolt head acts as an intermediary between the nut and the bus bar connection portion. By allowing axial movement of the bolt head, it mediates the fastening force distribution, preventing direct stress concentration on the bus bar while maintaining secure attachment.
2Stability of the object's composition
If the bolt head is fixed to the mount portion, then the structure is stable, but the bus bar cannot accommodate displacement, leading to bending during fastening
Solution Approach 1:
The bolt head is designed with axial movement capability relative to the mount portion, transforming the static fixed structure into a dynamic adjustable one. This allows the bus bar to accommodate displacement during fastening while maintaining overall structural stability.
Solution Approach 2:
The axial position of the bolt head is changed during fastening to accommodate bus bar displacement. This parameter change allows the system to adapt to dimensional variations in the bus bar while maintaining stable attachment.
Data Source
AI summary
There is provided a bolt support structure which can absorb displacement of a bus bar and prevent the bus bar from bending during fastening of bolt, having a bolt including a head portion and a shaft portion and a mount portion to which the head portion is mounted movable in an axial direction of the shaft portion. The mount portion includes a bottom and upper plates between which a large-diameter portion of the head portion is positioned. The shaft portion and a small-diameter portion of the head portion are passed through a notch of the upper plate. A gap between the bottom and upper plates is larger than the thickness of the large-diameter portion. After the head portion is mounted to the mount portion, the nut is attached to the shaft portion so that the bus bar and the terminal clamp are sandwiched between the head portion and the nut.