Deterministic Design for Load Capacity Enhancement in Planetary Roller Screw Mechanism With Different Thread Profiles
Why this work is in the frame
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Bibliographic record
Abstract
Abstract Load distribution in the planetary roller screw mechanism (PRSM) is typically non-uniform, leading to extremely high contact pressure and shortening the service life. This study presented a deterministic design method to address the inherent non-uniformity of load distribution. By the matching design of screw, roller, and nut pitch, the deformation coordination that causes uneven load distribution was effectively compensated. The structural parameters and thread profile of PRSM were further optimized to enhance load capacity. The effects of installation configurations, structural parameters, and thread profiles on the load capacity performance of PRSM were comprehensively explored. A larger nominal diameter ratio of roller to screw reduces the maximum contact pressure on the nut–roller interface consistently, while the pressure on the screw–roller interface decreases initially and then increases, with an about 5/8 ratio offering the optimal balance for load capacity performance across both interfaces. A smaller pitch leads to a more uniform load distribution and a reduction in the maximum contact pressure. Additionally, convex–concave–concave thread profiles for screw, roller, and nut effectively minimize the maximum contact pressure on both interfaces. This study provides a highly effective and innovative tool for the structural design of PRSM with high load capacity.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it