Bolt Holding Structure With Resin Holder for Stable Conductor Clamping
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Solution Overview
Problem
Existing bolt holding structures apply local forces to conductors, causing deformation and weakening of the holding force due to a small contact area between the bolt and the conductor.
Innovation Solution
A bolt holding structure with a bolt and a holder, where the bolt includes a fixing portion, a shaft portion, and a receiving portion, with the holder made of resin to stabilize the bolt and ensure insulation, and the receiving portion is designed to minimize local forces on the conductor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductor is sandwiched between the bolt and the nut, then the conductor can be held and electrically connected, but the contact area is small causing local force application that may deform the conductor or weaken the holding force
Solution Approach 1:
A holder made of resin is introduced as an intermediary component between the bolt and the conductor. The holder increases the contact area with the conductor, distributing the clamping force more evenly and preventing local stress concentration that would deform the conductor or weaken the holding force.
Solution Approach 2:
The holder changes the physical parameters of the contact interface by providing a larger surface area compared to the bolt alone. This parameter change (increased contact area) directly reduces the stress density on the conductor, preventing deformation while maintaining reliable electrical connection.
2Reliability
If the holder is made of resin, then insulation between the bolt and holder is ensured and elastic deformation stabilizes the fix, but the fixing mechanism must be designed for press-fitting attachment
Solution Approach 1:
The holder utilizes the elastic deformation property of resin material, changing the mechanical parameter of flexibility. This allows the holder to be easily attached to the bolt through press-fitting while maintaining a stable connection, as the resin can deform elastically to accommodate the fixing portion and then retain the bolt firmly.
3Ease of manufacture
If the receiving portion is circular when viewed in the axial direction, then the contact area with the conductor is ensured regardless of orientation and manufacturing is easier, but the receiving portion must be precisely positioned between the fixing portion and shaft portion
Solution Approach 1:
The bolt is designed with asymmetric functional zones: the receiving portion is positioned between the fixing portion and the shaft portion in the axial direction, and has a portion located radially outward from the fixing portion when viewed in the axial direction. This asymmetric arrangement ensures proper positioning and functional separation of the bolt components during manufacturing 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
The structure suppresses conductor deformation and maintains stable holding force by increasing the contact area and dispersing applied forces, while allowing easy assembly and ensuring electrical insulation.
Implementation Method 1
the holder is made of resin. This makes it possible to stably fix the bolt to the holder by utilizing the elastic deformation of the resin while ensuring insulation between the bolt and the holder
Data Source
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AI summary
The bolt holding structure (100) includes a bolt (13) and a holder (12). The bolt (13) holds the conductors (bus bar (14), terminal (15)) between itself and the nut (17). The holder (12) holds the bolt (13). The bolt (13) includes a fixing portion, a shaft portion (33), and a receiving portion (32). The fixing portion can be fixed to the holder (12). The shaft portion (33) is formed with a screw groove, and the nut 17 is fastened thereto. The receiving portion (32) is located between the fixing portion and the shaft portion (33) in an axial direction, and has a portion located radially outward from the fixing portion when viewed in the axial direction.