Open-Nut Ball Screw Assembly for Passing Supporting Holders
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Solution Overview
Problem
Conventional ball screw assemblies with complete cylinder nuts face issues of sagging and deflection due to the need for additional resilient mechanisms, which can affect manufacturing precision and performance, especially when the nut passes supporting holders.
Innovation Solution
The introduction of a ball screw assembly with an open nut featuring an axial opening, allowing it to pass supporting holders without interference, eliminating the need for resilient mechanisms and maintaining structural integrity, while also providing a modular configuration for flexible application with adjustable circulators and shields for varying loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complete cylinder ball nut is used with supporting holders, then the screw can be supported to prevent sagging, but the ball nut cannot pass the supporting holder without interference, requiring additional resilient mechanisms
Solution Approach 1:
The ball nut is designed with an axial opening that segments the cylindrical structure, allowing the screw to pass through the supporting holder without interference while maintaining the supporting function. This segmentation eliminates the need for resilient mechanisms and complex temporary positioning systems.
Solution Approach 2:
The axial opening creates a new dimensional pathway through the ball nut, allowing the screw to pass through the supporting holder in the axial direction without lateral interference. This dimensional change resolves the conflict between supporting capability and passage capability.
2Ease of operation
If resilient mechanisms are added to supporting holders to move away during passage, then the ball nut can pass without interference, but the screw sags due to weight when the holder is away, causing deflection and bending
Solution Approach 1:
The axial opening segments the ball nut structure, allowing continuous supporting contact between the screw and supporting holder during passage. This eliminates screw sagging and maintains positioning precision without requiring resilient mechanisms that would cause deflection.
Solution Approach 2:
The supporting holder continuously supports the screw through the axial opening without requiring active resilient mechanisms. The structure itself provides the supporting function passively, maintaining precision without additional complex components.
3Ease of operation
If additional resilient mechanisms are configured at supporting holders, then the ball nut can pass the supporting portion, but the device complexity increases and manufacturing precision becomes compromised
Solution Approach 1:
The axial opening segments the ball nut to create a passage way, eliminating the need for resilient mechanisms. This simple structural modification provides passage capability without increasing device complexity or compromising manufacturing precision.
Solution Approach 2:
The axial opening extracts the passage function from the complex resilient mechanism system, providing a simpler, more reliable solution that maintains manufacturing precision while enabling the ball nut to pass the supporting holder.
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
This design enhances manufacturing precision and performance by preventing sagging and deformation, ensuring smooth operation and dustproofing, with flexible modular configurations to suit different load requirements.
Implementation Method 1
By the cooperation between the ball nut provided with balls rolling in the circulating race and the screw provided with a spiral groove, the friction between the ball nut and the screw can be reduced during the operation.
Data Source
AI summary
A ball screw assembly includes a guider, an open nut, open shields, a first circulator, a second circulator, and ball circulating assemblies. The open nut is slidably fitted over the guider and includes an axial cylinder having an axial opening. Inner spiral channels of the axial cylinder and spiral channels of the guider form inner ball races. The open shields are coaxially fitted over the axial cylinder. An inner peripheral wall of each of the open shields and an outer annular wall of the axial cylinder form an outer ball race. The first circulator and the second circulator are disposed on the axial cylinder corresponding to the open shields. The inner ball races, first curves of the first circulator, the outer ball races, and second curves of the second circulator form ball circulating races, and the ball circulating assemblies roll in the ball circulating races.