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Design and Kinematic Analysis of Gears
Published in Kevin Russell, Qiong Shen, Raj S. Sodhi, Kinematics and Dynamics of Mechanical Systems Implementation in MATLAB® and Simmechanics®, 2018
Kevin Russell, Qiong Shen, Raj S. Sodhi
As mentioned in Section 8.2, helical gears can be used to transmit motion between parallel and nonparallel shafts (also called crossed shafts) that do not intersect.* It was also noted in that section that helical gears have a greater load-bearing capacity and wear resistance, quieter and smoother operation than spur gears. These advantages are the result of the teeth of a helical gear lying at an angle (labeled the helix angle in Figure 8.15) with respect to the gear’s center axis. This angled tooth profile increases the contact between mating gear teeth for greater load distribution (resulting in the advantages given).†
Gears and Gear Trains
Published in Eric Constans, Karl B. Dyer, Introduction to Mechanism Design, 2018
Like spur gears, helical gears can transmit motion between parallel axes. The teeth of a helical gear are set at an angle, called the helix angle. A common value for the helix angle is 45° as shown in Figure 8.2. Because of the helix angle, the teeth engage gradually (and therefore quietly) instead of suddenly, as in the case of spur gears. All forward gears in a manual transmission are helical, which is the main reason that manual transmissions are almost inaudible at highway speeds. Helical gears have more teeth in contact than spur gears; this distributes the load more evenly and makes helical gears, on average, stronger than spur gears.
Types of Gear Drives: Arrangements, Tooth Forms
Published in Peter Lynwander, Gear Drive Systems, 2019
To take advantage of the helical gearing benefits described above, yet not generate axial thrust loads, double helical gearing is used (Figure 1.14). The two halves generate opposite thrust loads, which cancel out. When the two helices are cut adjacent to one another with no gap between, the gearing is termed herringbone. Because helical gear thrust is proportional to the tangent of the helix angle, single helical gears tend to have lower helix angles than do double helical designs, where the thrust loads cancel. Typical single helical helix angles are 6 to 15°. Double helical gearsets have helix angles of up to 35°.
Gear concept selection procedure using fuzzy QFD, AHP and tacit knowledge
Published in Cogent Engineering, 2020
Edmund S. Maputi, Rajesh Arora
Concerning case study 1 where concept 6 was selected, the selection matrix shows that the gearbox is of double stage configuration and can achieve a wide spectrum of speed ratios. Concept 6 can be shaft base or flange mounted thereby making it suitable for multiple applications. Concept 6 can be applied for helical and spur gear tooth forms. Literature, (Gearboxes for incline conveyors, 2020) indicates that helical gearboxes are best suited for inclined conveyor as compared to worm gearboxes. Furthermore, helical gearboxes are more efficient and will result in lower running costs as compared to worm gearboxes. On the other hand, worm gearboxes require less purchase cost compared to helical gear systems. The voice of customer statements specified that the selected gearbox must be the least cost option and yet have a long service life. This is captured by concept 6 which emphasizes low running costs, which contribute more to the cost component of the gear system. Concept 6 is also has a coaxial gear arrangement which improves the attainment of low volume and low weight gear structures. (Rall & Staples, 2011) confirmed that there is an increased need for gearbox systems that should produce more power with less weight in conveyor systems.
Design optimisation of mating helical gears with profile shift using nature inspired algorithms
Published in Australian Journal of Mechanical Engineering, 2022
N. Godwin Raja Ebenezer, S. Ramabalan, S. Navaneethasanthakumar
Gears are mechanical elements used to transmit power and motion. As helical gears have maximum precision and high power transmission efficiency, they are more preferred in industrial machines. There is a great demand of gear with higher load carrying capacity, lesser weight and noise. A depiction of mating helical gears is shown in Figure 1.