Bending strength of oil-lubricated cylindrical plastic gears

Hasl, Christian; Oster, P.; Tobie, Thomas; Stahl, Karsten

doi:10.1007/s10010-017-0224-2

Cited by 17 publications

(7 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In FEM simulations, the material characteristics were represented as linearly elastic, employing the material properties outlined in the manufacturer's datasheet, as presented in Table 2. The presumption of linear elastic behavior is commonly employed in polymer gear-design stress calculations, as the computed strains remain below the polymer material's yield point [8,27]. It was affirmed by Černe et al [57] that the assumption of linear elastic mechanical behavior provides a suitably accurate approximation of the material's performance for practical thermo-mechanical modeling purposes in gear design applications.…”

Section: Stress Evaluationmentioning

confidence: 99%

“…The guidelines employ the same root and flank strength control models as the ones used in the DIN 3990 [7] standard, which is used for steel gears. Polymer materials are much more flexible than steel ones, and plastic teeth exhibit higher teeth deflection while meshing, leading to an increase in the contact ratio [8]. The use of polymer gears is limited also by a major lack of available material data, which are crucial for gear design.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Process Parameters on the Crystallinity and Geometric Quality of Injection Molded Polymer Gears and the Resulting Stress State during Gear Operation

Zorko

2023

Polymers

View full text Add to dashboard Cite

The quality of gear manufacturing significantly influences the way load is distributed in meshing gears. Despite this being well-known from practical experience, gear quality effects were never systematically characterized for polymer gears in a manner able to account for them in a standard calculation process. The present study employs a novel combination of numerical and experimental methods, leading to a successful determination of these effects. The findings of the study enhance existing gear design models and contribute to a more optimized polymer gear design. The study first explores the effect of injection-molding parameters on the gear quality and secondly the effect of resulting gear quality on the stress conditions in a polymer gear pair. For the gear sample production, different combinations of process parameters were investigated, and a classic injection-molding and the Variotherm process were utilized. Gear quality and crystallinity measurements were conducted for all produced gears, providing insights into the correlation between them. Based on the evaluated gear quality of produced samples, the effect of gear quality was further studied by numerical means within a meaningful range of quality grades and transmitted loads. Special attention was dedicated to lead and pitch deviations, which were found to exert a noteworthy influence on the stress state (both root and flank) of the gear. The effect of lead deviation was most pronounced when improving the gear quality from grade Q12 to grade Q10 (30% to 80% stress reduction, depending on the load). However, enhancing the quality grade from Q10 to Q8 yielded less improvement (5% to 20% stress reduction, depending on the load). A similar pattern was evident also for pitch deviations.

show abstract

Section: Stress Evaluationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Process Parameters on the Crystallinity and Geometric Quality of Injection Molded Polymer Gears and the Resulting Stress State during Gear Operation

Zorko

2023

Polymers

View full text Add to dashboard Cite

show abstract

“…114 A modified method of ACORARS (Actual Contact Ratio Root Stress) is used to increase the accuracy for calculating bending strength of plastic gears (Acetal) based on VDI 2736. 113 As observed from Table 6, polyamide gears are checked more than acetal gears due to the fact that polyamide dominantly fail due to cracks or fracture whereas acetal shows wear and thermal failure. Sometimes roughness also affects the loading capacity as observed in a case where roughness of steel gear (driver) influences the abrasion of PA gear (driven).…”

Section: Classification Of Review Of Polymer Gearingmentioning

confidence: 99%

A review on materials and performance characteristics of polymer gears

Jain

Patil

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

In this research work an extensive review on use of advance materials and performance of polymer gears. Further, literature on polymer gears has been divided into four divisions based on the type of gear material, performance characteristic, modifications, and manufacturing techniques. Materials like polyamide and acetal and their composites are focused due to their huge application quotient. Use of in total six grades that is, PA6, PA66, PA12, PA46, PA618, and PA645 as gear material have been identified. Use of glass and carbon fiber reinforcements in PA gears with varying percentage in a range of 20%–35% and 15%–30%, respectively have been observed. Failure and performance characteristics such as wear, thermal, fatigue, load, transmission, and operational have been illustrated and described in detail. Research studies to improve thermal performance of plastic gears by modifying gear tooth and its profile has also been discussed along with their effects. Application of advance manufacturing technique such as 3D printed additive manufacturing in producing plastic gears is also talked over in this article. This compiled review work aims to assist researchers in selection of plastic gear material and to explore various factors and parameters affecting the failure behavior and performance of plastic gears.

show abstract

“…The fatigue life of injection-molded polyamide 6 gears in different environments (dry, grease, and oil) was investigated by Crippa and Davoli. 6 Hasl et al 7 observed a higher transmission performance of polymeric gears under lubrication than under dry conditions. Dearn et al 8 investigated the poly-ether-ether-ketone (PEEK)–PEEK gear pair performance under lubricated conditions and reported pitting on the test gear tooth surface.…”

Section: Introductionmentioning

confidence: 98%

Performance of selective laser sintered polyamide spur gear under dry and lubricated conditions

Bharti

Selvaraj

2022

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

The durability of a selective laser sintered (SLS) polyamide gear was evaluated using an in-house gear test rig under dry and oil-lubricated conditions. The lubricated SLS gear exhibited inferior contact fatigue performance at lower torques than that under dry conditions. Cyclic contact stress coupled with sliding motion diffuses the lubricating oil into the porous subsurface and reduces the contact fatigue strength of the gear tooth. The failure of the SLS gear under dry conditions exhibited the polishing effect, thermal softening with surface cracks, and thermal bending at 1.8, 2.5, and 3.5 Nm, respectively, whereas failure of the SLS gear under the oil-lubricated condition was only pitting for all the considered conditions. The lubricated gear exhibited superior performance at a higher torque than the gears in the dry-running condition, owing to its improved thermal stability.

show abstract

Bending strength of oil-lubricated cylindrical plastic gears

Cited by 17 publications

References 1 publication

Effect of Process Parameters on the Crystallinity and Geometric Quality of Injection Molded Polymer Gears and the Resulting Stress State during Gear Operation

Effect of Process Parameters on the Crystallinity and Geometric Quality of Injection Molded Polymer Gears and the Resulting Stress State during Gear Operation

A review on materials and performance characteristics of polymer gears

Performance of selective laser sintered polyamide spur gear under dry and lubricated conditions

Contact Info

Product

Resources

About