Flexible Joint Assembly for Angle Measurement Tolerance Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing angle measuring devices face significant measurement errors due to dimensional tolerances in machine parts, particularly shafts, leading to inaccuracies in rotary movement measurements.
Innovation Solution
A structural unit for an angle measuring device featuring a flexible axial joint and a flexible radial joint, combined with a self-centering assembly unit that allows for large tolerance compensation, ensuring precise alignment and minimizing eccentricity and wobbling errors through a clamping mechanism without play, wear, or lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clamping ring presses the hub shaft against the machine part, then the angle measuring device can be mounted on the machine part, but non-negligible measurement errors occur due to dimensional deviations
Solution Approach 1:
The hub shaft is divided into multiple segments (first hub shaft segment, second hub shaft segment) connected by flexible joints. This segmentation allows each segment to independently accommodate dimensional deviations while maintaining the overall mounting function, thereby preserving measurement accuracy despite variations in machine part dimensions.
Solution Approach 2:
The flexible joints introduce controlled flexibility parameters into the hub shaft structure. By changing the rigidity parameter locally at the joint regions, the system can adapt to dimensional deviations in the machine part without transmitting these deviations to the angle measuring device, thus maintaining measurement precision while ensuring reliable mounting.
2Measurement precision
If dimensional tolerances of the machine part are reduced to achieve high measurement accuracy, then measurement precision improves, but manufacturing complexity and cost increase
Solution Approach 1:
The flexible joint structure enables the hub shaft to self-adjust and self-center relative to the machine part. This self-service mechanism automatically compensates for dimensional deviations without requiring external adjustment mechanisms or highly precise manufacturing, allowing the system to achieve high measurement accuracy with relaxed tolerance requirements.
3Stability of the object's composition
If the hub shaft is rigidly connected to the machine part, then structural stability is improved, but eccentricity and wobbling errors increase due to dimensional tolerances
Solution Approach 1:
The hub shaft transitions from a completely rigid structure to a dynamic structure with flexible joints that can adaptively adjust to dimensional deviations. The flexible joints provide controlled compliance that maintains structural stability for mounting while allowing the necessary movement to eliminate eccentricity and wobbling errors during operation.
4Measurement precision
If flexible joints are introduced to compensate for dimensional deviations, then measurement precision is maintained, but device complexity increases
Solution Approach 1:
The flexible joints replace complex mechanical adjustment mechanisms (such as threaded adjustments, shims, or alignment devices) with a simpler elastic deformation mechanism. This substitution achieves the same function of compensating for dimensional deviations and maintaining measurement accuracy while significantly reducing structural complexity and eliminating the need for additional adjustment components.
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 solution enhances measuring accuracy by effectively compensating for dimensional deviations, reducing measurement errors and maintaining high precision even with large tolerances, thus improving the reliability and accuracy of angle measurements.
Implementation Method 1
the first joint is designed to be flexible in the axial direction, while the second joint is designed to be flexible in the radial direction
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a assembly for an angle-measuring device, comprising a first section (1) having an angle scale (1.1) for measuring a rotary movement about an axis (Z), and a second section (2) for fastening the assembly to a machine part (4). The assembly further comprises a third section (3) which connects the first section (1) to the second section (2). The third section (3) has a first and a second joint (3.11, 3.21, 3.31; 3.11'; 3.12, 3.22, 3.32), wherein the first joint (3.11, 3.21, 3.31; 3.11') is designed to be flexible in the axial direction, and the second joint (3.12, 3.22, 3.32) is designed to be flexible in the radial direction.