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Related Concept Videos

Frictional Forces on Screws01:17

Frictional Forces on Screws

Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
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In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
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Design of Transmission Shafts

The design of a transmission shaft is governed by two primary specifications: the power it transmits and its rotational speed. These parameters guide the selection of the shaft's material and cross-sectional dimensions, ensuring that the material's maximum shearing stress remains within the elastic limit while transmitting the desired power at the given speed. The system's power is intrinsically linked to the applied torque. The torque applied to the shaft can be calculated by reconfiguring the...
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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
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Journal bearings are mechanical components that support and provide lateral stability to rotating shafts and axles. They are crucial in reducing friction, wear, and vibration in machinery such as engines, turbines, and pumps. The principle behind journal bearings is forming a thin lubricant film between the bearing surface and the rotating shaft, which minimizes direct contact and reduces frictional forces.
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Twin-Screw Extrusion Process to Produce Renewable Fiberboards
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Review on thread profile modification methods for the planetary roller screw mechanism.

Yanqiang Sun1,2,3, Kun Zhang1, Zhaoyao Shi4

  • 1School of Construction Machinery, Shandong Jiaotong University, Jinan 250357, China.

Iscience
|June 15, 2026
PubMed
Summary
This summary is machine-generated.

Planetary roller screw mechanisms (PRSMs) suffer from uneven load distribution. Thread profile modification effectively reduces stress and wear, improving performance in aerospace and robotics applications.

Keywords:
applied sciencesengineering

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Area of Science:

  • Mechanical Engineering
  • Tribology
  • Actuator Systems

Background:

  • Planetary roller screw mechanisms (PRSMs) are high-precision actuators vital for aerospace, robotics, and automotive sectors.
  • Uneven load distribution in PRSMs causes stress concentration and wear, limiting performance.
  • Thread profile modification offers a solution to enhance load distribution and reduce stress.

Purpose of the Study:

  • To review the fundamental aspects of PRSMs, including their origin, classification, kinematics, and load-bearing characteristics.
  • To comprehensively analyze various thread profile modification methods, both local and global.
  • To provide a theoretical basis for improving PRSM engineering applications through advanced modification strategies.

Main Methods:

  • Literature review of PRSM origin, classification, load-bearing characteristics, and kinematics.
  • Analysis of local modification techniques (e.g., half-thread thickness, pitch diameter, crest, root modifications).
  • Examination of global modification strategies (e.g., concave-convex arc reconstruction, multi-parameter optimization).

Main Results:

  • Discrete modification techniques can decrease average contact stress by approximately 35.55%.
  • Thread profile modification significantly improves load uniformity among thread teeth.
  • Identified mechanisms, advantages, and limitations of various modification approaches.

Conclusions:

  • Thread profile modification is a key strategy for optimizing PRSM performance by mitigating stress concentration and wear.
  • A proposed macro-meso-micro modification framework offers a structured approach for future PRSM design.
  • Further research into measurement techniques and potential negative effects is recommended for comprehensive PRSM development.