| 摘要 |
PURPOSE: To prevent edge load from being generated on the cut rising part of a width across flat without decreasing the extracting force of a bush by providing a relief groove for preventing interference to the cut rising part of the width across flat on the inner peripheral surface of the bush. CONSTITUTION: An inner rotor 2b of an oil pump 2 is rotated by the rotation of a pump 4 through a sleeve 8, and control oil pressure of a torque converter 1 is discharged from the oil pump 2. At this time, oil pressure reaction is generated on the inner rotor 2b so as to lift the tip of the sleeve 8, however, edge load is not generated on the inner surface of a metal material 10c since the cut rising part 8b of the width across flat 8a formed on the sleeve 8 is positioned in the relief groove 10c formed on the inner surface of the metal material 10a of a bush 10 and is not brought in slid-contact with the inner surface of the metal material 10a. Therefore, the bush 10 inner surface can be prevented from running short of oil, from being seized and from being abnormally worn, and the extracting force of the bush 10 can be secured. |
