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Motors and Drives
Published in Muhammad E. Fayed, Thomas S. Skocir, Mechanical Conveyors, 2018
Muhammad E. Fayed, Thomas S. Skocir
A wide variety of gear types and arrangements can be used alone or in combination to produce the required speed reduction ratio. Commonly used gears include spur gearhelical gearbevel gearworm gearplanetary geartoroidal gearcycloid gear
X-Ray-Based Fabrication
Published in Mohamed Gad-el-Hak, MEMS, 2005
A number of precision component examples will be described to illustrate the diversity of applications. The first (Figure 5.43) reveals a spiral spring with 3 micron feature size and 0.15N/m lateral spring constant. Such a component would require prohibitively difficult conventional machining. Because cantilevered springs of this type possess a stiffness proportional to the cube of their thickness in the direction of flexure, a consistent spring stiffness requires submicron tolerances. The ability to pattern fine features within relatively large geometry allows accurate scaling of gears as depicted in Figure 5.44. Arbitrary gear teeth profiles are possible, and thus any pressure angle for an involute geometry, for example, may be accommodated. These components have been applied to miniature precision planetary gear box construction (Figure 5.45). Micro cycloid-gear systems have also been fabricated through multiply exposed and aligned DXRL sequences resulting in gear ratios of 18 [Hirata et al., 1999].
Power Transmission and Gearing Systems
Published in Wei Tong, Mechanical Design and Manufacturing of Electric Motors, 2022
where ηgc is the efficiency of gear meshing, including gear contacting in the first stage and cycloid gear contacting in the second stageηb is the efficiency of all bearings in the systemηh is the efficiency related to the hydraulic loss in the lubricant
Error identification and verification of cycloid gear profile surfaces in precision forming grinding
Published in Australian Journal of Mechanical Engineering, 2021
Zhong Chen, Wenjie Li, Xianmin Zhang, Longxuan Wang, Yuanyuan Li, Junpeng Dang
In this paper, the profile errors of a cycloid gear of an RV reducer are separated from the point-cloud data measured by an outside coordinate measurement machine (CMM). Moreover, the most related geometric errors of a 4-axis grinding machine tool with a rotary table are identified in an actual machining test. This grinding machine tool is a kind of special-purpose machine tool only for precision grinding of cycloid gears. An actual cycloid gear, machined in a normal grinding process, is adopted as a test piece in machining test measurement, and the separated errors are directly correspondent to the accuracy requirements of the cycloid gear. So our contributions are that a novel comprehensive error identification method and scheme for actual cycloid gears and special-purpose grinding machine tools are presented compared to the aforementioned machining test of versatile multi-axis machine tools.
Kriging-based unconstrained global optimization through multi-point sampling
Published in Engineering Optimization, 2020
Yaohui Li, Shuting Wang, Yizhong Wu
The structural simulation design problem of a cycloid gear pump (Demenego et al.2002) is used as an example. A sketch of the pump is shown in Figure 12. The design problem is defined as follows: As input variables, parameters α1, α2, β1 and β2 are the closing angle of the inlet, the opening angle of the outlet, the opening angle of the inlet and the closing angle of the outlet, respectively. The optimization objective Q is an average volume flux in the outlet. The corresponding volume efficiency , defined as the ratio between the average volume flux and theoretical flow Q0 (3.22 l/min) (Mao et al.2005), is shown in Equation (14): To reflect real conditions, 10 initial sample points are chosen to build the initial kriging, and the optimization process is terminated if the total number of evaluations reaches 60. The initial optimal solution of Q is 2.3670 l/min and the corresponding volume efficiency is 73.51%. Optimization iteration results for the average volume flux in the outlet for the three methods are shown in Figure 13. The best average volume flux and the corresponding volume efficiency are listed in Table 3. It can be seen that KMUGO has a better convergence, and the average volume efficiency obtained by KMUGO has increased by about 0.975%, 0.0883% and 2.096%, in contrast with GEGO, MPSK and KGOMISC.
Assessment of contact forces and stresses, torque ripple and efficiency of a cycloidal gear drive and its involute kinematical equivalent
Published in Mechanics Based Design of Structures and Machines, 2022
Hamza Tariq, Zhaksylyk Galym, Andas Amrin, Christos Spitas
The input torque for both models had the same period despite having phase difference (Figure 14). In the case of the conventional cycloidal drive (model A), it can be seen that the torque transmission is less smooth compared to its involute alternative (model B). This kind of behavior is due to the mating between the cycloid gear and the ring gear. Since model A has eight ring gear teeth, there are eight small peaks per period. Similarly, model B follows the same behavior, however, due to the difference in the topology, the torque profile is smoother with small periodic fluctuations, resulting in more even transmission.