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1

Influence of atmospheric gas upon seizure of gas bearings

Karpov P., Harada M., Tsukazaki J., Yamamoto H.

International Journal of Applied Mechanics and Engineering

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2004

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Vol. 9, no spec.

105-109

EN

In this paper the influences of atmospheric gas such as oxygen or argon upon seizure are investigated. The hydrostatic journal bearings are used as a test apparatus. Oxygen and argon were used as a lubricant in bearing test process. Bronze bearings finished by lapping are used under the combination with steel shafts finished by honing. It was clarified that the process of gas makes an important role for frictional force, origin of debris and the seizure. On the other hand, plastic deformation of the asperities of surface roughness by rubbing action seemed to be a main reason for seizure of similar materials of steel. The surface finishing influences upon the origin of debris and the seizure superior to atmospheric gas.

2

The characteristics of hydrostatic journal bearing with a floating bush

Yamamoto H., Harada M., Tsukazaki J., Sato Y.

International Journal of Applied Mechanics and Engineering

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2002

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Vol. 7, Spec. is

127-132

EN

We proposed a new type hydrostatic journal bearing with a floating bush to decrease the frictional torque. The characteristics of proposed bearing are calculated and we found out the optimum design parameter. Moreover, we fabricated the test bearing and measured the characteristics of bearing. The calculated results and the measured results are relatively coincide with each other.

3

Influence of surface finishing upon seizure of bearings

Harada M., Tsukazaki J., Yamamoto H.

International Journal of Applied Mechanics and Engineering

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2002

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Vol. 7, Spec. is

133-138

EN

Influences of the surface finishes upon seizure are investigated experimentally by using hydro-static air bearings as an experimental apparatus. Bronze and steel bearings finished by lapping and turning are used under the combination with steel shafts finished by honing. It was clarified that bronze bearings finished by lapping came to seizure more easily than the one finished by turning and the wear debris played an important role in this case. On the other hand, plastic deformation of the asperities of surface roughness by rubbing action seemed to be a main reason for seizure of similar materials of steel.

4

Characteristics of journal bearings lubricated with ferro-fluid

Harada M., Yang W., Tsukazaki J., Yamamoto H.

Applied Mechanics and Engineering

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1999

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Vol. 4, no spec.

33-38

EN

This paper presents a hydrodynamic lubrication theory for journal bearings lubricated with ferro-fluid. A two-dimensional lubrication equation considering the magnetic force, the angular momentum of particle and the change of the apparent viscosity depend on the magnetic fields is proposed. According to this equation, the characteristics of the finite length journal bearings lubricated with ferro-fluid are investigated.