| 摘要 |
PURPOSE:To dissolve the trouble of the differential gear oil such as the increase of the traveling resistance and the deterioration of oil by forming a partitioning wall for partitioning an engine case inside space and a differential gear inside space into a heat transmissivity improving structure for improving the heat exchange between the engine oil in the engine case and the differential gear oil in the differential gear case. CONSTITUTION:On the low temperature start, the engine oil is warmed by the warming operation of an engine, and the heat of the engine oil is easily transmitted to the differential gear oil in a differential gear case 66 through a heat transmissivity improving structure consisting of the heat transfer ribs 22a and 22b and a partitioning wall 21, and also the differential gear oil is warmed. Therefore, even no the low temperature start, the viscosity of the differential gear oil lowers speedily, and the drive resistance in the differential gear mechanism reduces. Further, if the temperature of the differential gear is raised by the revolution of the differential gear mechanism in the continuous traveling at a high speed, the heat of the differential gear oil is transmitted to the engine oil through the heat transmissivity improving structure but the temperature of the differential gear does not rise excessively, since the engine is cooled by water, etc. |
