VALVE STEM SEAL

• Main Author: KWON, HYUG MYUNG
• Format: Patent
• Language: English; Korean
• Published: 05.02.2013
• Subjects: BLASTING; CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES; CYLINDERS; ENGINE PLANTS IN GENERAL; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; PISTONS; SEALINGS; STEAM ENGINES; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS; THERMAL INSULATION IN GENERAL; WEAPONS

PURPOSE: A valve stem sealing member is provided to prevent an engine oil leakage through a gap between a main rib and a valve stem and to make a proper amount of oil flow through the gap. CONSTITUTION: A valve stem sealing member(100) comprises a reinforcing member(110) and a rubber member(120). The reinforcing member is formed along a valve guide(4). The rubber member is joined to the reinforcing member in contact with the valve stem and the valve guide. The rubber member comprises a joining unit(122), a main rib unit(124), and a sub rib unit(126). The main rib unit is formed to be inclined from the joining unit to an engine port and a cross section of a leading end portion of the main rib unit is formed into a thread shape. The sub rib unit is closely adhered to the valve stem when static pressure is generated in the engine port and spaced from the valve stem when the negative pressure is generated.