Electronic Control Device Motor Post Sensor Alignment
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Solution Overview
Problem
The electronic control device with a bus bar less structure faces misalignment issues between the terminal contact pad and the pressure sensor due to errors in positioning, leading to potential strain on the circuit board and increased parts count for screw fixation.
Innovation Solution
The device employs a motor post for electrical connection and a pair of elastic fixing members to secure the pressure sensor, eliminating the need for a locating pin and reducing misalignment factors, while maintaining accurate terminal contact through elastic arm portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a bus bar less structure is used to reduce parts count and size, then parts count and device size are reduced, but the circuit board strains due to pressing force and misalignment occurs between terminal contact pad and pressure sensor
Solution Approach 1:
The patent introduces a resin case as an intermediary component that integrates multiple functions: it holds the circuit board, supports the pressure sensor, and provides positioning features (protrusions and recesses) to ensure accurate alignment between the terminal contact pad and pressure sensor terminal. This mediator component resolves the misalignment issue inherent in the bus bar less structure while maintaining the benefits of reduced parts count.
Solution Approach 2:
The resin case merges multiple functions into a single integrated component: structural support for the circuit board, positioning mechanism for alignment, and housing for the pressure sensor. By combining these functions, the patent eliminates the need for separate bus bars and locating pins, reducing parts count while maintaining manufacturing precision through the integrated positioning features.
2Volume of moving object
If the sensor terminal directly contacts the terminal contact pad to eliminate bus bar, then device size is reduced, but positioning accuracy deteriorates due to multiple error factors
Solution Approach 1:
The resin case incorporates pre-formed positioning protrusions and recesses that establish accurate alignment between the circuit board and pressure sensor before final assembly. This preliminary positioning action ensures that the terminal contact pad and pressure sensor terminal are correctly aligned, eliminating the need for additional locating pins and maintaining positioning accuracy in the compact bus bar less structure.
3Stability of the object's composition
If multiple screws are used to fix the circuit board to prevent strain, then circuit board stability is improved, but parts count increases
Solution Approach 1:
The resin case integrates circuit board fixation and pressure sensor positioning into a single structural component. The case includes integrated fixation structures that secure the circuit board without requiring separate screws, while simultaneously providing positioning features for the pressure sensor. This merging of functions maintains circuit board stability while avoiding the increase in parts count that would result from using multiple screws.
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 improves the accuracy of terminal contact and reduces parts count, enabling size reduction and cost savings by minimizing misalignment and strain on the circuit board.
Implementation Method 1
a pair of fixing members (17, 17) each having elastic arm portions (17a, 17a) are arranged at both sides of the pressure sensor (4)
Data Source
AI summary
An electronic control device has a resin case to which a circuit board having a terminal contact pad is fixed; a hydraulic unit having an electromagnetic solenoid which controls a hydraulic circuit and a pressure sensor which detects a pressure of the hydraulic circuit; a motor post having a current-carrying member which electrically connects a motor and the circuit board and extending from the resin case and inserted in the hydraulic unit; and a fixing member which is provided at the resin case and holds an outer periphery of the pressure sensor. Positioning between the pressure sensor and the terminal contact pad of the circuit board is made by the motor post inserted in the hydraulic unit and fixation of the pressure sensor by the fixing member.