潤滑油を含浸させた焼結材料を用いた自己潤滑機構を持つ歯車の潤滑解析

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  • Lubrication simulation for self-lubricating gears with oil-impregnated sintered materials

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<p>Self-lubricating system using oil impregnated sintered material is widely used in journal bearing. The system has been transplanted to highly loaded gear contact and proofed its functionality. Lubrication is an important factor for fatigue of gear. However, conventional lubricating system have power loss because oil is shook up in gear box. The new lubrication system has merit that the loss can be reduced as it lubricates contact by bleeding oil from inside gears. Because now it still has problem in stability, it is required to understand its behavior by theoretical calculation. Therefore, this study aims to establish a simulation model to calculate lubricant flow under highly loaded contact, considering compressibility of fluid and deformable porous material. Darcy's law is used as governing equation for homogenized flow in porous material. Biot's theory, that describe interaction between lubricant flow and deformation of matrix of porous material, was extended to use in the condition that porous matrix is moving as gears contact is sliding each other. Those equations are implemented in commercial finite element method (FEM) software and solved. Result shows that deformation effect is not large but positive on the system, and when contact pressure is applied both on solid and fluid, the amount of oil that flow into porous material from oil exceeds the amount that can be supplied from oil film. It implies the interaction between porous flow and fluid flow in the oil film is not negligible.</p>

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