自動車用駆動系歯車における平滑化歯面のかみ合い摩擦損失の予測法

抄録

There is a need to have a highly accurate method of estimating meshing friction loss in order to improve the efficiency required of automotive transmissions. The friction coefficient for calculating meshing friction loss can be estimated accurately with the formula proposed by Matsumoto and coworkers, which uses the ratio of the sum of the maximum surface roughness of two tooth surfaces, Rz, to the minimum oil film thickness. However, for some smoothly finished gears, estimation accuracy may decline due to differences from conventional tooth surface properties. In this study, experiments were conducted to measure the meshing efficiency of gear pairs with different tooth surface roughness and properties. It is shown that the friction coefficient was estimated with greater accuracy by using the lambda ratio value that is employed as a parameter of the oil film thickness on bearings.