| 主权项 |
1. A vacuum pump comprising,
a housing which has a pump room inward, a vane which is disposed in the pump room and rotated by a rotor and divides the pump room to workspaces, and a cap in which a sliding surface slid on inner surface of the pump room is configured and which is attached at the tip of the vane, wherein the sliding surface of the cap is configured as arc shape in the view from the rotational axis direction, and wherein the width toward the sliding direction of the cap is configured to be smaller than the width at the sliding angle field which is virtual area for contacting the inner surface of the pump room among the circumference including the arc shape of the sliding surface of the cap and configured to be bigger than the width at the high loading area where the load added to the sliding surface which is bigger than the predetermined value among the sliding angle field. |
