Segmented Threaded Nut for Linear Drive Safety Mounting
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Solution Overview
Problem
Existing linear drive devices face challenges with the alignment and mounting of safety nuts, which can lead to incorrect installation and reduced safety functionality, especially when used in applications requiring both pushing and pulling forces.
Innovation Solution
A threaded nut design with two spaced parts and a safety nut positioned between them, along with a holding piece that provides radial and axial positioning aids, simplifies the mounting process and ensures correct alignment without additional adjustment, allowing the safety nut to automatically assume its predetermined position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a safety nut is arranged in a hollow cylindrical recess with carriers and notches for alignment, then the safety nut can be positioned radially, but considerable adjustment effort is needed for exact alignment during mounting
Solution Approach 1:
The main nut is divided into two separate parts (first part and second part) with threaded sections at spaced locations. The safety nut is positioned between these two parts, which eliminates the need for complex alignment mechanisms while ensuring precise axial positioning through the natural spacing between the two main nut parts.
2Reliability
If the safety nut is prevented from performing rotary motion to avoid meshing with the spindle thread, then the safety nut remains disengaged during normal operation, but the linear drive device can operate only as pulling or pushing drive depending on mounting order
Solution Approach 1:
Dividing the main nut into two parts creates distinct zones: the safety nut positioned between them engages with the spindle thread only when the main nut fails. This segmentation allows the system to function as both pulling and pushing drives regardless of mounting orientation, as the safety nut's engagement is determined by failure condition rather than drive direction.
3Ease of operation
If the safety nut is arranged between two threaded sections of the main nut, then the safety nut automatically assumes its predetermined axial position without additional adjustment, but the main nut structure becomes more complex
Solution Approach 1:
The main nut is segmented into two parts with threaded sections at spaced locations, creating a natural positioning zone for the safety nut between them. This segmentation provides automatic axial positioning of the safety nut during mounting, as the safety nut simply needs to be placed in the space between the two main nut parts rather than requiring precise alignment with carriers and notches.
Data Source
AI summary
A threaded nut is provided for a linear drive having a rotatable spindle. The threaded nut is provided with a main nut, wherein the main nut is intended for being arranged with its internal thread on the external thread of the spindle, and is intended to perform a translatory displacing motion during a rotary motion of the spindle. The threaded nut has, furthermore, a safety nut, which is intended not to mesh by its internal thread with the external thread of the spindle during the normal operation of the linear drive and to mesh with the thread of the spindle in case of failure of the main nut. To make possible simple mounting in case of such a threaded nut means and to reduce the risk for incorrect alignment, the main nut (11) has a first part and a second part. The two parts are located at spaced locations from one another and each part being provided with a threaded section (18a, 18b) of the main nut (11), wherein the safety nut (12) is intended to be arranged between the two threaded sections (18a, 18b).