Surface durability of injection-moulded carbon nanotube–polypropylene spur gears

Siddhartha

Proceedings of the Institution of Mechanical Engineers, Part J:

2017

The significance of polymer gears to transmit power and motion is increasing continuously due to their inherent characteristics. Polymer gears have established themselves as attractive alternatives to traditional metal gears in plethora applications. They are light in weight, have lower inertia, and run noiseless than their metal counterparts. This article presents a comprehensive review of the research on polymer spur gears operating under low (0–8 Nm) and moderate (>8 and ≤17 Nm) loading conditions. Different polymers and polymer composites used till date for the fabrication of such gears are included along with different operating conditions. Various design features of polymer gears and tooth modification techniques for the improvement of the performance and durability of these gears have also been included in this review. The aspects of the modeling and simulation studies of the polymer gears are also emphasized in this paper for completeness of the review. The concept of hybrid gears is discussed along with their tribological properties. Various methods of manufacturing of polymer gears and their failure modes are discussed so as to make the article useful for researchers.

Section: Gear Pairmentioning

confidence: 99%

Polymer spur gears behaviors under different loading conditions: A review

Siddhartha

Proceedings of the Institution of Mechanical Engineers, Part J:

2017

“…Transmission efficiency of polymer gears is also improved with the inclusion of carbon nanotube. 23 Mertens and Senthilvelan 24 enhanced the transmission efficiency of polymer gears by using 2% compressed air cooling at the mating surface of master and test gears.…”

Section: Literature Reviewmentioning

confidence: 99%

Development and investigation on transmission efficiency of functionally graded material-based polybutylene terephthalate spur gears

Proceedings of the Institution of Mechanical Engineers, Part J:

Siddhartha

2019

Application of polymer composite gears is increasing due to their superior properties. They have lower inertia, less weight, and run much quieter than their metal counterparts. In the present work, functionally graded material-based glass fiber reinforced polybutylene terephthalate gears are fabricated with a novel horizontal centrifugal casting technique using an injection molding machine. Conventional technique is used to fabricate homogeneous polybutylene terephthalate gears. Polybutylene terephthalate reinforced with 15 and 30 wt% glass fibers is used to fabricate gears. Unfilled polybutylene terephthalate gear is also manufactured for comparative study. Gradation in functionally graded material gear is verified by scanning electron microscope analysis, and Shore D hardness is measured in three different locations of the fabricated functionally graded material gears. Gradation in functionally graded material gear is also verified by ignition loss test method. Continuous gradation is observed in functionally graded material gear by scanning electron microscope and confirmed by hardness test and ignition loss test. The objective of present work is to investigate and compare the transmission efficiency of homogeneous and functionally graded material gears during operation. A polymer gear test rig is used for the experimental work. Experiments are conducted at various torque and speed combinations for 0.2 million cycles. Life span of fabricated gear is also tested for 10 million cycles. The range of the torque is 0.8–2.6 N m and the range for rotational speed is 500–1400 r/min. The transmission efficiency of the fabricated gears is found to be sensitive to the operating torque.

“…The design and performance of lightweight polymer and polymer composite gears have also been studied extensively in the literature, but their application is limited to low power transmission applications only. [16][17][18][19][20][21][22][23] Bi-metal and hybrid gears provide an appreciable weight reduction and performance comparable to steel gears. But the drawback of these gears is the problem of delamination and the presence of high-stress concentration on the joining interface due to abrupt changes in the material properties.…”

Section: Introductionmentioning

confidence: 99%

Dynamic response analysis of functionally graded gears

Proceedings of the Institution of Mechanical Engineers, Part L:

Mulik

Harsha

2022

In this study, dynamic response analysis of functionally graded gears (FGGs) has been performed using a 6-degree of freedom dynamic model. The pinion and gear are divided into homogeneous sub-domains of uniform thickness, conforming to the gear tooth profile. The material composition varies radially according to power-law gradation with metal at the innermost and ceramic at the outermost surface. Mesh stiffness and transmission error of FGGs have been evaluated using a finite-element-based numerical method employing contact analysis. Results show that for considered values of gradient index (GI), FGGs show a 10% to 50% reduction in mesh stiffness with a 30% to 60% reduction in weight compared to steel gears of exact specifications. Also, FGGs show a 4% to 12% reduction in dynamic factor and a 9% to 17% reduction in peak-to-peak displacement amplitude than steel gears over the selected values of GI.