Axial Measuring Jig for Confined Valve Hole Diameter
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Solution Overview
Problem
Conventional measuring jigs require a large space to operate effectively due to a significant turning radius, making it difficult to measure inner diameters when sufficient space is limited.
Innovation Solution
A measuring jig with a measuring instrument disposed on the axis of the insertion shaft, allowing for a smaller turning radius, and an operation shaft that can be positioned coaxially with the insertion shaft, enabling measurements in confined spaces by adjusting the length of the insertion shaft and using a master gauge for accurate reference value setting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measuring instrument is disposed around an axis of the insertion shaft away from the axis itself, then the measuring instrument can be brought into contact with the inner wall of the hole portion, but the turning radius becomes large requiring a large space around the measuring jig
Solution Approach 1:
The measuring instrument is divided into separate functional components: the probe contact portion that touches the inner wall and the body portion that houses the measurement mechanism. This segmentation allows the probe to extend to the inner wall while the main body remains compact and positioned on the insertion shaft axis, reducing the overall turning radius.
Solution Approach 2:
The invention transitions from a two-dimensional radial arrangement where the entire measuring instrument rotates around the insertion shaft axis to a three-dimensional configuration where the probe extends radially from the axis while the main body remains aligned with the axis. This dimensional change allows contact with the inner wall without requiring the entire instrument to have a large turning radius.
2Area of stationary object
If the measuring instrument is disposed on the axis of the insertion shaft to reduce turning radius, then space requirement is reduced, but it becomes difficult to bring the probe into contact with the inner wall of the hole portion
Solution Approach 1:
The probe acts as an intermediary element that bridges the gap between the measuring instrument body (positioned on the insertion shaft axis) and the inner wall of the hole portion. The probe extends radially from the body to make contact with the measurement target, enabling measurement capability while maintaining the compact axial positioning of the main instrument.
Solution Approach 2:
The probe is designed with dynamic positioning capability, allowing it to extend and retract or adjust its position radially from the measuring instrument body. This dynamic adjustment enables the probe to reach the inner wall of the hole portion for measurement while the main body remains compact and positioned on the insertion shaft axis.
Data Source
AI summary
In a measuring jig for measuring an inner diameter of a valve hole portion formed coaxially with a guide hole, the measuring jig includes: an insertion shaft inserted into the guide hole; and a measuring instrument having a probe that is disposed around an axis of the insertion shaft and that is brought into contact with an inner wall of the valve hole portion. The inner diameter of the valve hole portion is measured by way of the probe by turning the measuring instrument about the axis, and the measuring instrument is disposed on the axis.