Ball Screw Clip Segmentation for Retention Reliability
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Solution Overview
Problem
Existing ball screw drives face issues with the retention of deflecting elements on the nut element, as the clip's elasticity loss leads to inadequate retention and potential loss of the deflecting element.
Innovation Solution
The clip is designed with a first resiliently biased section for clamping and a second section separated by a slit for snapping, ensuring a perfect retention of the deflecting element on the nut element and preventing clip loss, with hook-shaped contours for secure engagement and slits to maintain independent functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-structure clip is used to retain the deflecting element, then the structure is simple, but the retention reliability deteriorates when elasticity is lost
Solution Approach 1:
The clip is divided into two distinct sections: a first section with a resiliently biased portion for clamping the deflecting element, and a second section for securing the clip to the nut element. This segmentation allows each section to specialize in one function, improving overall reliability while maintaining manufacturing simplicity through integral construction.
Solution Approach 2:
Different portions of the clip are designed with different mechanical properties: the first section incorporates a resiliently biased portion with specific elasticity for clamping, while the second section is designed for rigid securing. This local differentiation of properties ensures optimal performance for each function without compromising the other.
2Reliability
If the clip uses resilient material for clamping, then the clamping function is improved, but the clip may lose elasticity over time
Solution Approach 1:
By separating the clip into two sections with different functions, the resilient material is concentrated only where needed for clamping, while the securing portion can use different material properties. This extends service life by reducing overall stress on the resilient portion.
Solution Approach 2:
The clip design changes the stress distribution parameters by providing a dedicated securing section that bears the load of attachment to the nut element, allowing the resilient section to maintain its elastic properties longer by experiencing reduced cumulative stress.
3Ease of manufacture
If the clip structure is simplified for easy manufacture, then manufacturing precision may be compromised
Solution Approach 1:
The segmented design with clearly defined first and second sections provides natural manufacturing zones that can be formed through standard stamping or forming processes. The slits creating the sections are simple features to incorporate into manufacturing, maintaining precision while ensuring ease of production.
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 guarantees the secure retention of deflecting elements on the nut element, preventing loss and maintaining functionality despite manufacturing tolerances, by separating clamping and securing functions and using resilient materials like spring sheet metal.
Implementation Method 1
said first section resiliently suspending the deflecting element on the nut element
Implementation Method 2
said second section retaining the clip inseparably on the deflecting element
Data Source
AI summary
A ball screw drive which has a ball nut arranged on a spindle. The ball nut has a nut element and a deflecting element that deflects balls out of one end of an endless ball channel defined by the ball nut and the spindle to a beginning of the ball channel. The deflecting element is retained on the nut element through a clip. At least one clip leg of the clip has a first, resiliently biased section and a second section separated from the first section by a slit. The first section resiliently suspends the deflecting element on the nut element and the second section retains the clip inseparably on the deflecting element.