| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve stem seal which sufficiently stabilizes the fixation of a seal in a seal radial direction, can suppress the wobbling of the seal in the radial direction, improves seal performance between the seal and a valve stem guide, and can suppress the leakage of a sealed fluid such as engine oil from a clearance between an attachment ring and the valve stem guide.SOLUTION: In a valve stem seal having an attachment ring which is attached to an outside diameter side of the valve stem guide penetrating a valve stem, and a back pressure lip which is held at an end part of the attachment ring, closely contacts with an outside diameter face of the valve stem, and is formed of a rubber elastic body, there is arranged a guide inside diameter side lip which is inserted into an inside diameter side of the valve stem guide, closely contacts with an inside diameter face of the valve stem guide, and is formed of a rubber elastic body.SELECTED DRAWING: Figure 2 |
