Valve stem seal device

摘要

A valve stem seal device has a valve stem guide, a cylindrical metallic ring retained to an outer periphery of the valve stem guide, a rubbery elastic seal lip integrally formed in one end side of the metallic ring, and hermetically sliding to the valve stem, and a valve stem seal having the cylindrical metallic ring and the seal lip and fixed to the valve stem guide side. The valve stem seal device has a stop ring retained between a circular-truncated-cone-shaped surface which is expanded toward a side of the seal lip formed in an outer peripheral surface of the valve stem guide, and a cylindrical inner peripheral surface of the metallic ring. The stop ring has a cut part, and a movement limiting means for limiting a movement in an axial direction of the stop ring is provided in the other end side of the metallic ring.

主权项

1. A valve stem seal device comprising:
a valve stem guide; a cylindrical metallic ring which is retained to an outer periphery of the valve stem guide; a seal lip which is integrally formed at a first end side of said metallic ring, hermetically slides in relation to the valve stem guide, and is made of a rubbery elastic material; a valve stem seal which is provided with the cylindrical metallic ring and the seal lip; and the valve stem seal being fixed to a side of said valve stem guide, wherein said valve stem guide has a circular truncated cone-shaped surface formed in an outer peripheral surface of said valve stem guide, said circular truncated cone-shaped surface expanding toward a side of said seal lip, and wherein a stop ring is fitted and retained between said circular truncated cone-shaped surface and a cylindrical inner peripheral surface of said metallic ring, said stop ring has a cut part, and a movement limiting means for limiting a movement in an axial direction of said stop ring is provided at a second end side of said metallic ring, wherein a circular truncated cone-shared portion corresponding to said circular truncated cone-shaped surface is formed in an inner peripheral surface of said stop ring.