Press-Fit Control Unit Guide Member Assembly
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Solution Overview
Problem
In control units with a press-fit structure, press-fit terminals often face positioning challenges with through holes, leading to insertion issues and potential short-circuits due to scraps generated from the holes.
Innovation Solution
A control unit design featuring a guide member that surrounds the substrate's periphery, with a guide hole and reduced-hole portion to guide the press-fit terminal into the through hole, preventing scrap movement and enhancing assembly precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If protruding portions and recessed portions are used for positioning, then positioning precision is improved, but assembly complexity increases
Solution Approach 1:
The guide member acts as an intermediary component between the press-fit terminal and the substrate. It provides the guide hole that receives the press-fit terminal and guides it to the through hole, while the protruding portions on the guide member interface with recessed portions on the substrate to establish precise positioning. This mediator approach resolves the contradiction by concentrating the positioning function in a dedicated component rather than requiring complex direct positioning features on both parts.
2Object-affected harmful factors
If the substrate support portion surrounds the entire periphery of through holes, then scrap movement is prevented, but positioning accuracy of press-fit terminals deteriorates
Solution Approach 1:
The substrate support portion is segmented into two distinct functional regions: a guide member with a guide hole for precise positioning of the press-fit terminal, and a substrate support portion that surrounds the through hole to prevent scrap movement. This segmentation allows each region to optimize its specific function without interfering with the other, resolving the contradiction between scrap containment and positioning accuracy.
3Reliability
If press-fit terminals are positioned with high precision, then insertion reliability is improved, but assembly ease deteriorates
Solution Approach 1:
The guide member performs preliminary positioning action by providing the guide hole that receives and guides the press-fit terminal before it reaches the through hole. The protruding portions on the guide member preliminarily establish the correct position relative to the substrate's recessed portions. This preliminary action ensures reliable insertion even when assembly precision varies, while maintaining ease of assembly through the guiding function.
Data Source
AI summary
In a control unit including a press-fit terminal, a substrate includes: a connected portion into which the press-fit terminal is connected; and a guide member, which surrounds a periphery of the connected portion and extends from the substrate. The press-fit terminal includes: a connecting portion formed on a tip end side of the press-fit terminal; and an enlarged portion formed adjacent to the connecting portion. The guide member includes: an opening portion, which opens in a direction in which the press-fit terminal is positioned; a guide hole extending from the opening portion to the substrate; and a reduced-hole portion formed adjacent to the opening portion. The guide hole is configured such that, when the connecting portion of the press-fit terminal is connected to the connected portion of the substrate, the enlarged portion of the press-fit terminal closes the reduced-hole portion of the guide hole.