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Helical, Bevel, and Worm Gears
Published in Ansel C. Ugural, Youngjin Chung, Errol A. Ugural, MECHANICAL DESIGN of Machine Components, 2018
Ansel C. Ugural, Youngjin Chung, Errol A. Ugural
Herringbone gear refers to a helical gear having half its face cut with teeth of one hand and the other half with the teeth of opposite hand (Figure 12.2). In nonparallel, nonintersecting shaft applications, gears with helical teeth are known as crossed helical gears, as shown in Figure 12.1b. Such gears have point contact, rather than the line contact of regular helical gears. This severely reduces their load-carrying capacity. Nevertheless, crossed helical gears are frequently used for the transmission of relatively small loads, such as distributor and speedometer drives of automobiles. We consider only conventional helical gears on parallel shafts.
Helical, Bevel, and Worm Gears
Published in Ansel C. Ugural, Youngjin Chung, Errol A. Ugural, Mechanical Engineering Design, 2020
Ansel C. Ugural, Youngjin Chung, Errol A. Ugural
Herringbone gear refers to a helical gear having half its face cut with teeth of one hand and the other half with the teeth of opposite hand (Figure 12.2). In nonparallel, nonintersecting shaft applications, gears with helical teeth are known as crossed helical gears, as shown in Figure 12.1b. Such gears have point contact, rather than the line contact of regular helical gears. This severely reduces their load-carrying capacity. Nevertheless, crossed helical gears are frequently used for the transmission of relatively small loads, such as distributor and speedometer drives of automobiles. We consider only conventional helical gears on parallel shafts.
Helical, Bevel, and Worm Gears
Published in Ansel C. Ugural, Mechanical Engineering Design, 2022
Herringbone gear refers to a helical gear having half its face cut with teeth of one hand and the other half with the teeth of opposite hand (Figure 12.2). In nonparallel, nonintersecting shaft applications, gears with helical teeth are known as crossed helical gears, as shown in Figure 12.1b. Such gears have point contact, rather than the line contact of regular helical gears. This severely reduces their load-carrying capacity. Nevertheless, crossed helical gears are frequently used for the transmission of relatively small loads, such as distributor and speedometer drives of automobiles. We consider only conventional helical gears on parallel shafts.
Characteristic sensitivity analysis of herringbone gear power-split transmission system
Published in Australian Journal of Mechanical Engineering, 2023
Jin-cheng Dong, San-Min Wang, Xiao-xi Kou
The herringbone gear in the torsional dynamic model of the herringbone gear power-split transmission system is regarded as two helical gears with opposite helical angles. All other parameters are the same for all gears. The herringbone gear pair is equivalent to two parallel helical gear pairs. According to the model developed using the centralised parameter method (Dong, Wang, and Lin et al. 2015; Ni 1989), the moment of inertia of each helical gear and the adjacent shaft segment are aligned to the geometric centre of the helical gear, which consists of 12 nodes. All external forces act on the corresponding nodes, and the connecting shaft segment between the first- and second-grade transmission is equivalent to the torsion stiffness and damping. In Figure 1, a generalised coordinate system is shown. The symbols in the figure are described as follows: