Integrated Position Sensor Shaft Tilt Suppression
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Solution Overview
Problem
Existing contactless position detecting devices face challenges in accurately restricting the tilt of a rotating shaft due to separate housing and holder components, leading to inaccuracies in position detection.
Innovation Solution
A position detecting device design that integrates a support member and bearing with a protective member, allowing the shaft to be supported by a single base, which includes a protrusion and fitting portion for secure assembly and hermetic sealing, thereby suppressing tilt without accuracy variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the housing and holder are separate bodies, then the assembly is easier to manufacture, but the accuracy in restricting the tilt of the shaft deteriorates
Solution Approach 1:
The housing and holder are integrated into a single piece structure. The housing includes a bottomed disposition portion that directly forms the holder function, eliminating the need for separate holder components. This integration ensures that the shaft is supported by a unified structure, accurately restricting shaft tilt without the accumulation of assembly errors that would occur with separate components.
2Adaptability or versatility
If the shaft is supported by multiple separate components, then the structure is more flexible, but the tilt suppression accuracy deteriorates due to variation when components are mounted
Solution Approach 1:
The support member and bearing are integrated into the housing as a unified structure. The housing includes a bottomed disposition portion that directly supports the shaft, eliminating intermediate mounting steps. This ensures that the shaft tilt is restricted by a single integrated structure rather than by multiple separate components that could introduce assembly variations.
3Ease of operation
If separate components are used for housing and holder, then the device can be assembled in parts, but the tilt restriction accuracy varies due to mounting variations
Solution Approach 1:
The housing is designed as an integrated piece that combines the functions of both housing and holder. The bottomed disposition portion is formed directly in the housing, creating a unified support structure for the shaft. This eliminates the need for separate holder components and their associated mounting operations, thereby eliminating the source of accuracy variation while maintaining assembly capability.
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
The integrated design effectively suppresses the tilt of the rotating shaft with high accuracy and reliability, preventing wear and foreign substance issues, while maintaining hermetic sealing and ease of assembly.
Implementation Method 1
a detecting element for detecting a magnetic field of the magnet
Data Source
AI summary
A position detecting device includes a shaft part that rotates in conjunction with a rotation of an external driving body, a magnet that is integrally provided at one end of the shaft part, a substrate on which a detecting element detecting a magnetic field of the magnet is mounted, a case that includes a disposition portion in which one end of the shaft part and the substrate are disposed, a protective member into which the other end of the shaft part is inserted and which covers the disposition portion, and a seal member that is disposed between the case and the protective member. A support member supporting one end of the shaft part and a bearing supporting the shaft part are mounted on the protective member. The protective member is provided with a protrusion, and the support member is provided with a fitting portion to which the protrusion is fitted.