VALVE STEM SEAL

PROBLEM TO BE SOLVED: To provide a valve stem seal 1 in which a seal lip 3a is not excessively abraded at an early stage even under dry and high-temperature conditions and which can stably seal a sealing fluid such as exhaust gas. SOLUTION: The valve stem seal 1 has the seal lip 3a which is arranged...

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Bibliographic Details
Main Author NAGASAWA SHINJI
Format Patent
LanguageEnglish
Published 28.07.2005
Edition7
Subjects
BLASTING
CYLINDERS
ENGINEERING ELEMENTS AND UNITS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
LIGHTING
MECHANICAL ENGINEERING
PISTONS
SEALINGS
THERMAL INSULATION IN GENERAL
WEAPONS
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Summary:PROBLEM TO BE SOLVED: To provide a valve stem seal 1 in which a seal lip 3a is not excessively abraded at an early stage even under dry and high-temperature conditions and which can stably seal a sealing fluid such as exhaust gas. SOLUTION: The valve stem seal 1 has the seal lip 3a which is arranged to one end part of a valve stem guide and freely slidably brought into close contact with the peripheral face of the valve stem. At least three annular protruding parts 4, 5, and 6, which are freely slidably brought into close contact with the peripheral face of the valve stem, is provided to the inner peripheral face of the seal lip 3a. An annular weir part 7 for holding grease is provided to the valve stem guide side of the annular protruding parts 4, 5, and 6. The inner diameter dimensions of the annular protruding parts 4, 5, and 6 are formed so as to be mutually equal. The dimension of the annular weir part 7 is set so as to form a minute radial clearance in-between the peripheral face of the valve stem. COPYRIGHT: (C)2005,JPO&NCIPI
Bibliography:Application Number: JP20040006271