Micromechanical Part Opening with Convex Rigid Areas
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Solution Overview
Problem
Existing micromechanical parts with alternating rigid and elastic areas fail to achieve a balance between low assembly force and high clamping force, leading to risks of fracture and microcracks during assembly, and do not allow for easy detection of defective assemblies.
Innovation Solution
A micromechanical part with an opening edge configuration featuring alternating rigid and elastic areas, where the rigid areas project convexly into the opening, allowing for precise centering and increased tolerance range, and featuring three rigid and three elastic areas for isostatic contact, which reduces the risk of microcracks and facilitates easy detection of assembly quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an opening with alternating rigid and elastic areas is used, then the risk of fracture is reduced, but the assembly force and clamping force cannot be simultaneously optimized
Solution Approach 1:
The opening edge is designed with alternating rigid areas and elastic areas, where each area has different mechanical properties. The rigid areas (with convex portions) provide structural support and centering, while the elastic areas provide flexibility and clamping force. This local differentiation allows the structure to simultaneously achieve low assembly force and high clamping force without fracture risk.
Solution Approach 2:
The opening edge is segmented into multiple discrete rigid areas and elastic areas rather than being a continuous structure. This segmentation allows independent optimization of each area's function - rigid areas for positioning and support, elastic areas for compliance and clamping - resolving the contradiction between assembly force and clamping force.
2Strength
If the rigid areas are made larger to increase clamping force, then the transmission torque increases, but the assembly force also increases causing higher fracture risk
Solution Approach 1:
By creating distinct rigid areas with convex portions and elastic areas with different mechanical properties, the structure can generate high transmission torque through the rigid areas while the elastic areas absorb assembly forces through deformation, preventing fracture even with larger rigid area dimensions.
3Measurement precision
If the opening shape is modified to improve centering precision, then the assembly quality increases, but the manufacturing complexity increases
Solution Approach 1:
The centering function is localized to specific rigid areas with convex portions that have predetermined geometries. These convex portions naturally guide the spindle into correct positioning without requiring complex overall opening shapes, achieving high centering precision through simple local features.
4Ease of manufacture
If traditional opening shapes are used, then manufacturing is simpler, but defective assemblies with microcracks cannot be easily detected
Solution Approach 1:
The convex portions of the rigid areas serve as visual indicators. When the micromechanical part is properly assembled on the spindle, the convex portions make specific contact patterns that can be visually inspected. Deviations from the expected contact pattern indicate potential defects or microcracks, enabling easy quality control without complex inspection equipment.
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 enables precise centering, reduces the risk of fracture and microcracks, increases assembly tolerance, and simplifies quality control by allowing for the detection of excessive clamping or interference fits, resulting in assemblies with virtually zero probability of defects.
Implementation Method 1
whose edges comprise an alternating arrangement of rigid areas and elastic areas
Data Source
AI summary
This micromechanical part is intended to be fastened to a spindle and has at least one opening (10, 20, 30) whose edges comprise an alternating arrangement of rigid areas (11) and elastic areas (12, 22, 32). It is possible for those ends (13) of the rigid areas (11) closest to the center C of the opening (10, 20, 30) to be connected by a first circle C1 having a diameter greater than the diameter of a second circle C2 connecting those ends (15, 25, 27) of the elastic areas (12, 22, 32) closest to the center of the opening. In this micromechanical part, each rigid area (11) is formed by a convex portion projecting into the opening (10, 20, 30).