Starter Electromagnetic Switch Terminal Structure for Cable Connection
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Solution Overview
Problem
The existing starter-use electromagnetic switch designs face challenges in facilitating easy cable connection between the excitation terminal of the main electromagnetic switch and the auxiliary electromagnetic switch, particularly due to limited space and the need for additional components to maintain waterproofness, which complicates the connection process.
Innovation Solution
The proposed starter-use electromagnetic switch features a terminal structure with a connection fitting and terminal fitting that allows for the excitation terminal to be connected to an external auxiliary electromagnetic switch using an ordinary cable, eliminating the need for additional members or machining, and incorporating a solenoid with a main contact that interrupts current to suppress starting currents, enabling easier cable connection and maintaining waterproofness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an additional metal fitting is provided to enable cable connection between excitation terminals, then cable connection becomes possible, but waterproofness becomes more difficult to maintain and device complexity increases
Solution Approach 1:
The terminal fitting is designed to serve multiple functions: it provides electrical connection for the excitation terminal and simultaneously serves as a cable connection interface. The terminal fitting includes a cable hole that allows cables to pass through, eliminating the need for separate cable connection mechanisms while maintaining waterproofness through the resin cover integration.
2Ease of operation
If an additional metal fitting is provided to enable cable connection, then cable connection becomes possible, but manufacturing complexity and cost increase
Solution Approach 1:
The terminal fitting is integrated with the resin cover as a unified structure. The cable hole is formed directly in the resin cover, and the terminal fitting is positioned within this hole. This merging of components eliminates the need for separate metal fittings and reduces assembly steps, thereby improving ease of manufacture while enabling cable connection.
3Device complexity
If the electromagnetic switch is designed with only one excitation terminal piece projecting from the resin cover, then the structure is simple, but cable connection between electromagnetic switches becomes impossible
Solution Approach 1:
The terminal fitting is divided into functional segments: the excitation terminal piece that projects from the resin cover for electrical connection, and the cable hole portion that allows cable passage. This segmentation enables the terminal fitting to provide both electrical connectivity and cable routing functionality while maintaining a relatively simple overall structure.
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 design simplifies the cable connection process between the main and auxiliary electromagnetic switches, improves workability, and enhances resistance to vibration and waterproofness, allowing for straightforward connection without additional components, thus addressing the complexity of cable connection in existing designs.
Implementation Method 1
an electromagnet implemented by an excitation coil of the starter-use electromagnetic switch
Implementation Method 2
a main contact turned on and off in interlock with energization and deenergization of an electromagnet
Data Source
AI summary
The starter-use electromagnetic switch has an electrical contact interposed in a power supply line for supplying power from a battery to a starter motor, the main contact being turned on and off in interlock with energization of an electromagnet implemented by an excitation coil. The electromagnetic switch includes a connection fitting connected to the excitation coil at one end thereof and drawn outside through a resin cover of the electromagnetic switch at the other end thereof, and a terminal fitting electrically and mechanically connected to the other end of the connection fitting at one end thereof, the other end of the terminal fitting being branched into first and second terminal pieces. The first terminal piece serves as an excitation terminal supplied with power from the battery. The second terminal piece serves as a connection terminal connected to an excitation terminal of an external electromagnetic switch through a cable.