多孔質含油軸受材料を用いた電気しゅう動接点のトライボロジー特性（多孔質ディスクの透過率が摩擦特性および通電性におよぼす影響）

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The electric sliding contacts are widely used in electrical components such as for automobiles. The purpose of the present study is to improve the performance characteristics of the electric sliding contacts and to extend their lifetime by applying the porous materials used for conventional sintered metal bearings to the surface materials of the sliding contacts. The effects of the permeability of porous materials on the frictional characteristics and the electrical conductivity have been investigated theoretically and experimentally. The sliding contacts used in the present study consist of a nonporous rider (stator) having spherical surface and a rotating porous disk (slider). The experimental analysis is conducted with a pin-on-disk friction tester to measure the frictional force and the contact voltage between the sliding contacts. The oil-film force and the frictional force between the rider and the rotating disk are also calculated by simultaneously solving the modified Reynolds equation and the Laplace equation derived from Darcy's law. The numerical results qualitatively agree with the experimental results. These results show that an increase in the permeability of the porous materials extends the operating conditions under the continuous metal contact to a higher value of the bearing characteristic number iS/i defined by iηUsub0/subL/i(iB/i/iL/i)/iW/i (iη/i: oil viscosity, iUsub0/sub/i: sliding speed, iL/i: length of rider in direction of motion, iB/i: width of rider, iW/i: applied load), and it also decreases the frictional force at the maximum iS/i at which the rider could contact with the disk surface. This suggests that the porous materials yield a lower frictional loss and thereby show a possibility for a longer lifetime.

多孔質含油軸受材料を用いた電気しゅう動接点のトライボロジー特性（多孔質ディスクの透過率が摩擦特性および通電性におよぼす影響）

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