Jig Positioning Inhibitor Switch Spline Shaft
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Solution Overview
Problem
Conventional methods for positioning an inhibitor switch fail when the manual shaft includes spline teeth, as the existing jigs cannot accurately position the switch in shift-by-wire systems where no wire or select lever is provided, leading to incorrect signal outputs.
Innovation Solution
A jig with a fitting part that spline-fits to the manual shaft's outer periphery and an engagement pin that engages with a positioning hole in the inhibitor switch, featuring a tooth-omitted part and internal teeth to ensure precise alignment, allowing the inhibitor switch to be positioned correctly even with spline teeth, by preventing relative rotation and maintaining the engagement pin's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional positioning jig with a flat part fitting hole is used, then the inhibitor switch can be positioned correctly in traditional systems with flat parts, but the jig cannot be used in shift-by-wire systems where the manual shaft has spline teeth
Solution Approach 1:
The positioning jig is redesigned with a fitting hole that can accommodate both flat parts and spline teeth. The fitting hole includes a toothed portion with internal teeth that can mesh with spline teeth on the manual shaft, while still being capable of fitting flat parts. This universal design allows the same jig to be used across different system types (traditional and shift-by-wire), resolving the contradiction between adaptability and positioning accuracy.
2Extent of automation
If the manual shaft is designed with spline teeth for shift-by-wire systems, then automated rotation control is enabled, but the existing positioning method using flat parts becomes inapplicable
Solution Approach 1:
The fitting hole's geometric parameters are modified to include a toothed portion with internal teeth that can engage with the spline teeth on the manual shaft. This parameter change allows the positioning jig to work with automated shift-by-wire systems while maintaining the simplicity of the positioning process. The toothed portion enables direct meshing with spline teeth, preserving ease of manufacture despite the increased automation level.
3Adaptability or versatility
If a new positioning jig design with spline engagement is created, then compatibility with shift-by-wire systems is achieved, but the device complexity increases
Solution Approach 1:
The fitting hole is segmented into distinct functional portions: a toothed portion with internal teeth for engaging spline teeth, and other portions that can accommodate flat parts. This segmentation allows each portion to be optimized for its specific function while maintaining overall simplicity. The modular structure reduces device complexity by clearly defining the role of each geometric feature rather than creating an entirely new complex mechanism.
Data Source
AI summary
An inhibitor switch is attached to a manual shaft with a jig. The jig includes a fitting part and an engagement pin. The fitting part is spline-fitted to an outer periphery of the manual shaft. The engagement pin engages in a positioning hole of the inhibitor switch. The outer periphery of the manual shaft includes a tooth-omitted part formed by omitting at least one of spline teeth. The fitting part includes an insertion hole. The insertion hole includes an inner periphery including internal teeth and an engaging part, wherein the internal teeth meshes with the spline teeth, and wherein the engaging part engages with the tooth-omitted part. The jig is attached to the manual shaft with the engaging part engaged with the tooth-omitted part. The inhibitor switch is rotated about the rotation axis to a position allowing engagement of the positioning hole with the engagement pin.