The durability and efficiency of an automatic transmission are greatly affected by the lubrication properties of transmission fluid. However, it is difficult to exactly estimate the flow rate of lubricating oil at each part of automatic transmission b...
The durability and efficiency of an automatic transmission are greatly affected by the lubrication properties of transmission fluid. However, it is difficult to exactly estimate the flow rate of lubricating oil at each part of automatic transmission because of its structural complexity under the rotating condition. This study is performed on oil flow distribution measures though each oil hole inside the main shaft supplying ATF for system parts. Oil enters a horizontal tube through entry and discharges into open air via radially-attached branches. Oil flow, pressure and rotational speed are varied. Changes in flow rate with rotational speed are obtained. This study is believed to be the start for the optimal design of the lubricating system in the automatic transmission.