Roller Screw Planet Holding Contours for Easier Assembly
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Solution Overview
Problem
Existing roller screw drives face challenges in assembly and disassembly complexity, requiring significant space and force due to the interaction of planets with guide rings and centering discs, which complicates the conversion of rotation into linear movement.
Innovation Solution
A planetary roller gear design with separate assembly and operating holding contours for planets, allowing radial displacement between assembly and operating positions, simplifying assembly and disassembly without increasing space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If planets are held in guide rings or centering discs with single holding position, then the structure is simpler, but assembly and disassembly become complex requiring significant space and force
Solution Approach 1:
The holding contour is segmented into two distinct functional parts: an assembly holding contour for simplified installation and a operating holding contour for functional operation. This segmentation allows the planet to be held in different positions for different phases of the device lifecycle, resolving the contradiction between assembly ease and structural complexity.
Solution Approach 2:
The holding contour transitions from a static single-position design to a dynamic multi-position design. The planet can be radially displaced between the assembly holding contour and the operating holding contour, allowing the structure to adapt to different operational requirements without increasing overall complexity.
2Ease of operation
If planets are held in fixed positions in guide rings, then the guide ring structure is simpler, but assembly requires significant space and force
Solution Approach 1:
The planet is preliminarily positioned in the assembly holding contour during the assembly process, which is designed to facilitate easy insertion with minimal force. This preliminary positioning allows the planet to be installed without requiring significant assembly force, and only after assembly is complete does the planet transition to the operating holding contour.
3Manufacturing precision
If separate guide rings are used for each planet, then planet positioning is more precise, but the overall device complexity increases
Solution Approach 1:
Multiple guide rings are merged into a single integrated guide ring structure that contains both the assembly holding contour and the operating holding contour. This merging maintains the precision of individual planet positioning while reducing the overall number of components and simplifying the guide ring system.
Data Source
AI summary
A roller screw drive, in particular in the form of a planetary roller gear, a roller screw drive or an inverse roller screw drive, including a threaded spindle with an external thread, a plurality of planets, and a spindle nut with an internal profile. Each planet has a profiled central section, which engages in the external thread of the spindle nut, and two equally profiled side sections which are thinner than the central section, which side sections each mesh with a section of the internal profile of the spindle nut. End sections of each planet adjoining the side sections are held in recesses of separate guide discs. Each recess for holding the planet has an assembly holding contour and an operating holding contour separated therefrom.