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Spur Gears
Published in Ansel C. Ugural, Mechanical Engineering Design, 2022
There are four principal types of gearing: spur, helical, bevel, and worm gears (Figure 11.1). Note that spur and helical gears have teeth parallel and inclined to the axis of rotation, respectively. Bevel gears have teeth on conical surfaces. The geometry of a worm is similar to that of a screw. Of all types, the spur gear is the simplest. Here, we introduce the general gearing terminology, develop fundamental geometric relationships of the tooth form, and deal mainly with spur gears. A review of the nomenclature and kinematics is followed by a detailed discussion of the stresses and a number of factors influencing gear design. The basis of the AGMA method and its use is illustrated. Other gear types are dealt with in the next chapter. For general information on gear types, gear drives, and gearboxes, see the website at www.machinedesign.com. The site at www.powertransmission.com lists websites for numerous manufacturers of gears and gear drives.
Spur Gears
Published in Ansel C. Ugural, Youngjin Chung, Errol A. Ugural, Mechanical Engineering Design, 2020
Ansel C. Ugural, Youngjin Chung, Errol A. Ugural
There are four principal types of gearing: spur, helical, bevel, and worm gears (Figure 11.1). Note that spur and helical gears have teeth parallel and inclined to the axis of rotation, respectively. Bevel gears have teeth on conical surfaces. The geometry of a worm is similar to that of a screw. Of all types, the spur gear is the simplest. Here, we introduce the general gearing terminology, develop fundamental geometric relationships of the tooth form, and deal mainly with spur gears. A review of the nomenclature and kinematics is followed by a detailed discussion of the stresses and a number of factors influencing gear design. The basis of the AGMA method and its use is illustrated. Other gear types are dealt with in the next chapter. For general information on gear types, gear drives, and gearboxes, see the website at www.machinedesign.com. The site at www.powertransmission.com lists websites for numerous manufacturers of gears and gear drives.
The accuracy and surface roughness of spur gears processed by fused deposition modeling additive manufacturing
Published in Adedeji B. Badiru, Vhance V. Valencia, David Liu, Additive Manufacturing Handbook, 2017
Junghsen Lieh, Bin Wang, Omotunji Badiru
The spur gear is a simple and popular mechanical component for power and motion transmission. The gear consists of teeth and hub with appropriate bore for shaft and/or bearing mounting. To understand how the gear is formed and how it is engaged with the other gears, it is necessary to understand the nomenclature of the teeth as shown in Figure 28.2. For safe, quiet and long-term operations, the geometry of the teeth must be perfectly formed, smooth, and rigid.
An efficient meshfree framework for simulation of crack tip stress fields in two-dimensional graded media subjected to thermoelastic loads
Published in Journal of Thermal Stresses, 2023
The mechanical spur gear is a common component in power transmission. With the advancement of manufacturing technology, the use of FGM in gears has gained huge importance. During its service life, it is subjected to various kinds of thermoelastic loads mainly arising during mating of gears and working environment. This makes the study of the fracture behavior of such components quite important so as to establish the reliability of the FGM component. In the current problem, the fracture behavior of cracked FGM spur gear subjected to thermoelastic loading has been considered. Inclined crack at the tooth root of the spur gear has been considered has been taken into consideration. Geometrical conditions of the spur gear have been shown in Figure 34. FGM considered in the current example consists of constituents as stainless steel and zirconia placed in such a way that material properties vary in the radial direction as follows [39]: where is the radius of the addendum circle and is the radius of the dedendum circle. The material properties of the contituents of this FGM spur gear are given in Table 6. Design parameters for this spur gear tooth are given in Table 7.
Application of an unstructured overset method for predicting the gear windage power losses
Published in Engineering Applications of Computational Fluid Mechanics, 2021
Y. Dai, L. Xu, X. Zhu, B. Ouyang
When further reduce the distance (300.5 mm), the overall power losses increased dramatically exceeding that of the sum of the spur/helical gear and the disk, as shown in Figure 13, Figure 14 and Table 6. This is directly related to the pocketing/squeezing power losses. Although there was no meshing between gear and other wheels, some degree of pocketing/squeezing behavior has appeared as soon as they get close enough. Moreover, Figure 11 depicts the velocity contour, in the case of the spur gear 1and a disk with the rotation speed of 6000 r/min, the center distance of 310 mm. As shown, the air surrounding the rotating disk holds nearly still while the movement of air caused by the spur gear 1 mainly occurs at about 1.0 and 1.5 times the radius of the gear, which is like that of the isolated gear in Figure 6. Inspired by that, it can deduce that the gear teeth are the leading cause of windage power losses.