Development of a New Hobbing of Spherical Gear.

Mitome, Ken-ichi; Okuda, Toshihito; Ohmachi, Tatsuya; Yamazaki, Takashi

doi:10.1299/kikaic.66.1975

Cited by 15 publications

(7 citation statements)

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“…Topological modification technology [1,2] is usually utilized to produce mismatched meshing of line-contact engaged gears, but actually it is difficult to design and optimize mismatched meshing regions. Mitome [3] invented spherical gears, which geometrically have two types of tooth profiles, convex teeth and concave teeth. Insensitive to machining or mounting error, the spherical gear set allows large axial misalignments without meshing interference.…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of torus involute gear including transient elastohydrodynamic effects

Liu¹,

Tan²

2016

J. vibroeng.

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The torus involute gear can compensate large axial misalignments and may possess good meshing characteristics without lead correction. In order to study its dynamic characteristics and verify its feasibility of the practical application, a new efficient rigid-elastic coupling dynamic model of multi-tooth is established which includes effects of lubrication oil film and tooth deformations directly in contact simulation of gears. In this model, each tooth is connected with the gearwheel by a rotatable spring-damper element whose stiffness is calculated through analysis of tooth deformation. The normal tooth contact force is determined via Lankarani and Nikravesh model. Variation of contact stiffness and rotatable spring stiffness with contact points are both taken into account. Combined with tooth contact analysis, the computation of friction coefficient is implemented with high efficiency by introducing the average lubrication oil film height. A three-dimension multi-body model of a torus involute gear pair is employed and verified by an impact experiment. The simulated results provide useful information about tooth impacts, dynamic transmission error and lubrication conditions like oil film heights and friction coefficients, and show that this type of gear can work with good meshing characteristics. The contributions in this paper lay theoretical basis for the application of the torus involute gear.

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Section: Introductionmentioning

confidence: 99%

Dynamic analysis of torus involute gear including transient elastohydrodynamic effects

Liu¹,

Tan²

2016

J. vibroeng.

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“…As depicted in Figure 1, to generate a convex spherical 13 gear, there are two feed motions as follows: the axial feed of the hob (the velocity is denoted as v Z 10 ) and radial feed of the workpiece (the velocity is denoted as V X 10 ), ensuring that the tooth surface of the imaginary rack cutter is a conical surface as shown in Figure 2. An accessory tangential motion (the velocity is denoted as v Y 10 ) is also applied to the hob to guarantee proper orientation of symmetry plane of the imaginary rack cutter.…”

Section: Mathematical Model Of Convex Spherical Gearmentioning

confidence: 99%

“…Mitome et al 13 brought forward the spherical gear drive and provided its machining method. This gear pair consists of the gear with convex teeth and the one with concave teeth.…”

Section: Introductionmentioning

confidence: 99%

Meshing characteristics of a sphere–face gear pair with variable shaft angle

Liu

Zhang

2019

Advances in Mechanical Engineering

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This article presents a sphere-face gear pair by substituting the convex spherical gear for the pinion of a conventional face gear pair. The sphere-face gear pair not only maintains the advantages of the face gear pair with a longitudinally modified pinion but also allows variable shaft angles or large axial misalignments. Meshing characteristics of the proposed gear pair are studied in this article. The mathematical models of the sphere-face gear pair are derived based on machining principles. The tooth contact analysis (TCA) and curvature interference check are conducted for the sphere-face gear pair with variable shaft angles. The loaded TCA is also implemented utilizing the finite element method. The results of numerical examples show that proposed gear pair has the following features. Geometrical transmission error of constant shaft angle or varying shaft angle is zero; contact points of the sphere-face gear set with variable shaft angle are located near the centre region of face gear tooth surface; there is no curvature interference in meshing; and transmission continuity of the gear pair can be guaranteed in meshing.

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“…It can be divided into concave and convex shapes which are proposed by Mitome et al [8]. The meshing of spherical gears can be cataloged into convex-convex, convex-concave, and convex-spur types in the intersected axes transmission as Fig.…”

Section: Introductionmentioning

confidence: 99%

Characteristics study of the gears by the CAD/CAE

Wang

Chang

Lee

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Gears are the most important transmission component in machines. The rapid development of the machines in industry requires a shorter time of the analysis process. In traditional, the gears are analyzed by setting up the complete mathematical model firstly, considering the profile of cutter and coordinate systems relationship between the machine and the cutter. It is a really complex and time-consuming process. Recently, the CAD/CAE software is well developed and useful in the mechanical design. In this paper, the Autodesk Inventor® software is introduced to model the spherical gears firstly, and then the models can also be transferred into ANSYS Workbench for the finite element analysis. The proposed process in this paper is helpful to the engineers to speed up the analyzing process of gears in the design stage.

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Development of a New Hobbing of Spherical Gear.

Cited by 15 publications

References 0 publications

Dynamic analysis of torus involute gear including transient elastohydrodynamic effects

Dynamic analysis of torus involute gear including transient elastohydrodynamic effects

Meshing characteristics of a sphere–face gear pair with variable shaft angle

Characteristics study of the gears by the CAD/CAE

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