Wheel Speed Sensor Lead Pressing Affixation

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Solution Overview

Problem

Existing wheel speed sensors face issues with load application during affixation, which can affect detection accuracy and require complex facility configurations due to two-directional movement, increasing costs.

Innovation Solution

A detection device with a base member and an affixing member that presses the lead against the base member without pressing the main body, allowing for single-directional affixation and reduced load on the detection element.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the molded IC is press-fitted into the recess by moving it horizontally after perpendicular approach, then the detection element can be affixed to the base member, but a load is applied to the IC chip in the main body which may cause detection result variations

Engineering Contradiction:

Improvedetection result stabilityVSAvoidload on IC chip

Core Design Contradiction:

ReliabilityVSForce

Solution Approach 1:

The invention extracts the pressing function from the main body affixation process. The affixing member is designed to press only the lead against the base member, while the main body is affixed separately without pressing. This separation removes the harmful load from the IC chip while maintaining the affixation function.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The affixation process is segmented into two independent operations: (1) affixing the main body to the base member without pressing, and (2) pressing the lead against the base member using the affixing member. This segmentation allows each operation to be optimized independently, preventing load application to the IC chip during main body affixation.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the molded IC is moved in two directions (perpendicular then horizontal) for affixation, then secure attachment is achieved, but interference with peripheral components occurs and facility configuration becomes complex increasing costs

Engineering Contradiction:

Improveaffixation securityVSAvoidfacility configuration complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Instead of moving the molded IC horizontally after perpendicular approach, the invention inverts the approach: the affixing member is moved perpendicular to the base member to press the lead, while the main body is affixed in the same perpendicular direction without horizontal movement. This inversion eliminates the need for horizontal movement and reduces facility complexity.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The affixing member acts as an intermediary that performs the pressing function separately. Rather than moving the molded IC itself in complex directions, the affixing member is introduced as a mediator to press the lead against the base member, simplifying the overall affixation process to a single perpendicular movement direction.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10641784B2Detection device

Publication Date: 2020.05.05 DENSO CORP

AI summary

A wheel speed detection device includes a detection element, a base member, and an affixing member. The detection element has a main body, leads, and protruding from the main body. The affixing member affixes the detection element to the base member by pressing the leads and against the base member without pressing the main body against the base member.