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Your search keyword '"Ryuta Nishihara"' showing total 8 results
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8 results on '"Ryuta Nishihara"'

1. A study on the sideband phenomenon of planetary gears

Author

Kunihiko MORIKAWA, Kouji KUMAGAI, and Ryuta NISHIHARA

Subjects
gear, planetary gear, vibration, mesh phase, side band component, translational direction force, rotational direction moment, Mechanical engineering and machinery, TJ1-1570, Engineering machinery, tools, and implements, TA213-215
Abstract

The mechanism of the sideband phenomenon of planetary gear vibration that often occurs in a planetary gear set was clarified in connection with mesh phase differences. This sideband phenomenon is one in which the (Z-1) or (Z+1) order component level is higher than the mesh order (Z) component level. The notation (Z-1) or (Z+1) means the mesh order (Z) minus or plus one carrier revolution. An in-phase (IP) planetary gear set has no such sideband phenomenon. In a sequentially phased (SP) planetary gear set, this phenomenon occurs in transverse and tilting vibration of sun gear, carrier and ring gear. Which sideband, either (Z-1) or (Z+1), occurs depends on the relationship between the mesh phasing direction and carrier rotation direction. To verify this sideband phenomenon, we derived the formulae to calculate the translational forces in x, y and z directions and the rotational moments about these translation axes which act to sun gear, carrier and ring gear due to mesh forces at each mesh point.

Published
2014
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2. Cell endogenous activities of fukutin and FKRP coexist with the ribitol xylosyltransferase, TMEM5

Author

Kazuhiro Kobayashi, Tamao Endo, Hiroki Tsumoto, Motoi Kanagawa, Hiroshi Manya, Mamoru Mizuno, Ryuta Nishihara, Rieko Imae, and Tatsushi Toda

Subjects
0301 basic medicine, Enzyme complex, Immunoprecipitation, Xylosyltransferase, Biophysics, Biochemistry, Muscular Dystrophies, Protein–protein interaction, Abnormal glycosylation, 03 medical and health sciences, Polysaccharides, Dystroglycan, Humans, Pentosyltransferases, Dystroglycans, Molecular Biology, Ribitol, biology, Chemistry, Membrane Proteins, Proteins, Cell Biology, Fukutin, Transmembrane protein, Cell biology, 030104 developmental biology, HEK293 Cells, Multiprotein Complexes, biology.protein
Abstract

Dystroglycanopathies are a group of muscular dystrophies that are caused by abnormal glycosylation of dystroglycan; currently 18 causative genes are known. Functions of the dystroglycanopathy genes fukutin, fukutin-related protein (FKRP), and transmembrane protein 5 (TMEM5) were most recently identified; fukutin and FKRP are ribitol-phosphate transferases and TMEM5 is a ribitol xylosyltransferase. In this study, we show that fukutin, FKRP, and TMEM5 form a complex while maintaining each of their enzyme activities. Immunoprecipitation and immunofluorescence experiments demonstrated protein interactions between these 3 proteins. A protein complex consisting of endogenous fukutin and FKRP, and exogenously expressed TMEM5 exerts activities of each enzyme. Our data showed for the first time that endogenous fukutin and FKRP enzyme activities coexist with TMEM5 enzyme activity, and suggest the possibility that formation of this enzyme complex may contribute to specific and prompt biosynthesis of glycans that are required for dystroglycan function.

Published
2018

3. Estimation and Improvement Method of Mesh Efficiency of Cylindrical Gears

Author

Susumu Matsumoto, Ryuta Nishihara, and Kunihiko Morikawa

Subjects
Friction coefficient, Surface (mathematics), Engineering drawing, business.industry, Mechanical Engineering, Tooth surface, Automotive transmission, Surface finish, Structural engineering, Physics::Classical Physics, Reduction methods, Industrial and Manufacturing Engineering, Transmission (telecommunications), Mechanics of Materials, Lubrication, business, ComputingMethodologies_COMPUTERGRAPHICS, Mathematics
Abstract

For the purpose of improving the efficiency of automotive transmission, there is a greater need to modify even the gear dimensions and tooth surface for reducing gear mesh power loss. In our study, we developed the prediction program and examined some reduction methods of the mesh power loss. To predict the mesh power loss of transmission gears accurately, it is necessary to estimate the friction coefficient at tooth meshing surface. But there was no formula with high accuracy for useful estimation of friction coefficient under mixed lubrication condition such as gear meshing condition. The one of authors proposed the new estimation formula of friction coefficient. In this paper, the usefulness of proposed estimation formula is confirmed and the prediction program of mesh power loss applying the proposed estimation formula of friction coefficient is also validated by several gear pair tests. From this prediction program and some experiments, the influence of gear dimensions, tooth surface modification, tooth surface roughness and driving condition on mesh power loss is discussed.

Published
2012
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