Current Detection Device Screw Fastening Narrow Space
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Solution Overview
Problem
The existing bus bar type shunt resistor connections, which rely on rotational fastening with screw members, face challenges in securing reliable connections, especially in narrow spaces like engine rooms, due to potential movement of bolts or nuts during fastening, leading to heat generation and reduced connection reliability.
Innovation Solution
A current detection device featuring a pair of conductive metal wiring members with a resistor body bonded to them, and a separate screw member fixed to one of the wiring members, allowing for easy rotational fastening of another screw member to secure connections, reducing the need for additional fixation and minimizing connection points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rotational fastening with screw members is used to connect bus bar type shunt resistor, then connection reliability is improved, but ease of operation deteriorates in narrow spaces
Solution Approach 1:
One screw member (nut) is preliminarily fixed to the wiring member before the fastening operation. This preliminary fixation eliminates the need to hold both screw members during assembly, making the rotational fastening operation much easier in narrow spaces while maintaining secure connection reliability
Solution Approach 2:
The fixed screw member acts as an intermediary that provides a stable reference point for the rotational fastening of the second screw member (bolt). This intermediary structure allows the bolt to be rotated and tightened without requiring simultaneous manipulation of both fastening components
2Reliability
If multiple connection points are used to ensure secure connection, then connection reliability is improved, but device complexity increases
Solution Approach 1:
The screw members serve dual functions: they provide mechanical fastening for secure connection and simultaneously act as electrical connection points. This merging of fastening and electrical connection functions reduces the number of separate components needed while maintaining reliable electrical connectivity
Solution Approach 2:
The screw members are designed to perform multiple functions: mechanical fastening, electrical connection, and positioning. This multi-functionality reduces the overall number of parts required in the assembly while ensuring secure and reliable connections
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 enables highly accurate and reliable current detection by integrating bus bar and shunt resistor functions, reducing the number of parts and connection points, while allowing for easier assembly and maintaining connection reliability even in constrained spaces.
Implementation Method 1
a resistor body consisting of metal material having a smaller temperature coefficient of resistance than the wiring members
Data Source
AI summary
Provided is a current detection device in which, to a bus bar type shunt resistor, another member can be easily connected and fixed by means of rotational fastening of screw members. The current detection device is provided with: a pair of wiring members (11, 12) consisting of electrically conductive metal material; a resistor body (13) consisting of metal material having a smaller temperature coefficient of resistance than the wiring members and which is bonded to the wiring members; and a screw member (16) which is fixed to at least one of the wiring members and which is a separate member from the wiring members. One screw member (16) is fixed to one surface of the wiring members (11, 12), and another screw member (17) is rotationally fastened to the one screw member (16) sandwiching another member (18, 19) disposed on the other surface of the wiring members (11,12).