SURFACE MODIFYING JIG OF ENGINE VALVE AND SURFACE MODIFYING METHOD EMPLOYING IT

• Main Authors: YAMAGUCHI, TAKAHIRO, KOSUGI, MASANORI, BABA, TADAO
• Format: Patent
• Language: English; French; Japanese
• Published: 19.10.2006
• Subjects: BLASTING; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES; DIFFUSION TREATMENT OF METALLIC MATERIAL; ENGINE PLANTS IN GENERAL; HEATING; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; METALLURGY; STEAM ENGINES; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; WEAPONS

A surface modifying jig (10) of an engine valve comprising a substantially circular ring portion (24) for holding the valve head (14) of an engine valve (12), a head holding portion (28) having a diameter decreasing gradually downward from the inner circumferential side of the ring portion (24), and a stem holding portion (30) formed below the head holding portion (28) with a substantially constant diameter. When plasma nitriding is performed, the valve head (14) comes into annular line contact with the ring portion (24) and being held by the head holding portion (28) while kept in annular plane contact therewith, and a valve stem (16) is held by the stem holding portion (30) while kept in annular plane contact therewith. L'invention concerne un montage de modification de surface (10) d'une soupape de moteur comprenant une partie en anneau essentiellement circulaire (24) pour soutenir la tête de soupape (14) d'une soupape de moteur (12), une partie soutenant la tête (28) ayant un diamètre diminuant graduellement vers le bas de la face interne circonférentielle de la partie en anneau (24), et une partie de tige de soutien (30) formée au-dessous de la partie soutenant la tête (28) avec un diamètre essentiellement constant. Lorsque la nitruration du plasma est effectuée, la tête de soupape (14) entre en contact dans une ligne annulaire avec la partie en anneau (24) et est soutenue par la partie de soutien de la tête (28) tout en étant maintenue dans un plan annulaire en contact avec elle, et la tige de manoeuvre (16) est soutenue par la partie de tige de soutien (30) tout en étant maintenue dans un plan annulaire en contact avec elle.