Linear Motion Guided Screw Assembly Radial Load Support
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Solution Overview
Problem
Conventional linear motion devices, such as lead screw and ball screw assemblies, experience reduced performance and shortened lifespan when subjected to radial or moment loads, requiring stronger and more costly components to accommodate these loads, which increases complexity and size.
Innovation Solution
A linear motion guided screw assembly that includes a screw shaft with a thread form supporting both axial and radial loads, a guidance means oriented parallel to the screw shaft, a follower assembly with anti-rotation means, and a non-rotatably mounted cartridge housing a nut with an axial bore for the screw shaft, allowing for efficient handling of axial, radial, and moment loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional linear guide systems use round or square linear shafts and bearings to support radial and moment loads, then the system can handle non-axial loads, but the system becomes more expensive, complex, and larger
Solution Approach 1:
The patent combines the linear guide function and anti-rotation function into a single integrated follower assembly. The follower assembly includes a linear bearing that guides motion along the screw shaft and an anti-rotation bearing that prevents rotation, merging multiple functions into one component rather than using separate guide systems
Solution Approach 2:
The follower assembly serves multiple functions simultaneously: it supports axial loads through the linear bearing, supports radial loads through the same linear bearing, prevents moment loads through the anti-rotation bearing, and eliminates rotation. This multi-functional design replaces the need for complex separate guide systems
2Strength
If stronger and more robust linear guide system components are used to accommodate radial and moment loads, then the system can handle non-axial loads, but the system size and cost increase
Solution Approach 1:
The follower assembly merges the guidance function and anti-rotation function into a single integrated structure, eliminating the need for separate robust guide components. The linear bearing and anti-rotation bearing work together in one assembly to handle both radial and moment loads efficiently
Solution Approach 2:
The follower assembly is designed as a modular cartridge that can be easily installed and replaced. The segmentation allows for simplified maintenance and reduces the overall system footprint while maintaining load support capabilities
3Reliability
If conventional guide systems are used to ensure proper functioning under radial and moment loads, then the system maintains reliability, but extensive installation alignment and periodic maintenance are required
Solution Approach 1:
By combining guidance and anti-rotation functions in one follower assembly, the patent eliminates the need for extensive alignment during installation. The integrated design self-aligns more easily and reduces the number of adjustment points required
Solution Approach 2:
The follower assembly is designed to be self-contained with integrated bearings and alignment features that reduce the need for periodic maintenance. The modular cartridge design allows for easy replacement without complex disassembly or realignment procedures
Data Source
AI summary
A linear motion screw assembly is provided herein which comprises (a) at least a first end support, (b) a screw shaft rotatably mounted to the first end support and defining a longitudinal direction, (c) a linear guide means mounted to the first end support and oriented parallel to the screw shaft, (d) a follower assembly mounted to the screw shaft and, associated therewith, an anti-rotation means in translatable contact with the guide means and movable in a longitudinal direction along the guide means, and (e) a cartridge non-rotatably mounted within said follower assembly, said cartridge including a guide nut having an axial bore through which the screw shaft is rotatably disposed.