Micro-movement Subassembly for Precision Angle Adjustment
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Solution Overview
Problem
Conventional micro-movement screw subassemblies for linear displacement suffer from gap errors due to processing inaccuracies, leading to inaccurate screw leading linear displacement, with existing solutions like using organic powder or elastic grooves being ineffective.
Innovation Solution
A micro-movement subassembly comprising a shank, a turnbuckle, and a central cylindrical shaft, where the shank has an internally threaded hole and a knurled outer surface, the turnbuckle has precise machining and a spherical surface, and the central cylindrical shaft allows for precise linear displacement and angle adjustment by point contact, reducing lead gap and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional screw and screw nut assembly is used for linear displacement, then the structure is simple and easy to manufacture, but gap error exists between screw and screw nut leading to inaccurate linear displacement
Solution Approach 1:
The invention divides the traditional screw-nut assembly into separate functional components: a screw shaft providing rotational input and a lead screw providing linear output. By separating the rotation function from the lead function, the system eliminates gap errors between mating threads while maintaining manufacturing feasibility through standardized screw thread connections.
Solution Approach 2:
The lead screw acts as an intermediary component between the screw shaft and the moving platform. It converts rotational motion from the screw shaft into precise linear displacement, eliminating direct contact between screw and nut that causes gap errors, while the knurled surface provides friction-based positioning without requiring tight tolerances.
2Manufacturing precision
If organic powder is used to fill gap between screw and screw nut, then gap error is reduced, but the powder continuously falls out and needs replenishment during work
Solution Approach 1:
The invention extracts and eliminates the source of gap errors by separating the screw shaft from direct nut engagement. Instead of trying to fill gaps with organic powder, the design removes the gap-problematic interface entirely by using the lead screw mechanism, which provides continuous contact without gap formation.
Solution Approach 2:
The knurled surface on the screw shaft provides self-positioning through friction contact with the lead screw. This self-service mechanism maintains positioning accuracy without requiring external powder filling or complex adjustment mechanisms, eliminating the need for continuous maintenance.
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 achieves precise linear displacement and reliable angle adjustment with reduced gap errors, reaching several micrometer accuracy, making it suitable for precise angle adjustment applications.
Implementation Method 1
The left half section of the outer cylinder is knurling
Implementation Method 2
The central cylindrical shaft has a spherical surface at one end, and is assembled within the precisely machined hollow space inside the turnbuckle... The spherical surface at the other end of the central cylindrical shaft drives an object by point contact
Data Source
AI summary
A micro-movement subassembly as a precise driving screw for angle adjustment, comprising a shank, a turnbuckle, and a central cylindrical shaft. The subassembly is precise for linear displacement, good orientation, stable and reliable adjustment, which can be used for a variety of precision-oriented precision micro-angle adjustment of the drive screw.