SLIDING SPLINE SHAFT DEVICE

• Main Authors: IWASA, Aiki, NAKAJIMA, Makoto, KASHIWABARA, Shigetoshi, KATSUMADA, Yasuyuki, KATADA, Kunio, ITO, Masato, SUZUKI, Shinichi, KODAMA, Tokunori, HIRAIWA, Shunsuke, NISHIJIMA, Takeo, KAWAGUCHI, Akihumi
• Format: Patent
• Language: English; French; Japanese
• Published: 28.11.2019
• Subjects: BLASTING; BRAKES; CHEMICAL SURFACE TREATMENT; CHEMISTRY; CLUTCHES; 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; COUPLINGS FOR TRANSMITTING ROTATION; DIFFUSION TREATMENT OF METALLIC MATERIAL; ENGINEERING ELEMENTS AND UNITS; FUELS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; LIGHTING; LUBRICANTS; LUBRICATING COMPOSITIONS; MECHANICAL ENGINEERING; METALLURGY; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TECHNICAL GASES CONTAINING CARBON MONOXIDE; THERMAL INSULATION IN GENERAL; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATINGINGREDIENTS IN A LUBRICATING COMPOSITION; WEAPONS

This sliding spline shaft device is provided with male splines, and female splines which fit together with the male splines so as to be capable of moving in the axial direction, with at least one of the sets of splines having a surface-treated layer. The surface-treated layer has, in order, an undercoat layer, an intermediate layer containing phosphate, and a topcoat layer containing a solid lubricant. The undercoat layer contains iron nitride and/or iron carbide, and a base material surface has high hardness; therefore, there is little microscopic deformation of the sliding surface and an increase in the real contact area can be suppressed, thereby preventing stick-slip. La présente invention concerne un dispositif arbre cannelé coulissant muni de cannelures mâles et de cannelures femelles s'adaptant sur les cannelures mâles de manière à pouvoir se déplacer dans la direction axiale, au moins l'un des ensembles de cannelures comportant une couche à surface traitée. La couche à surface traitée comporte, dans l'ordre, une sous-couche, une couche intermédiaire contenant du phosphate et une couche de finition contenant un lubrifiant solide. La sous-couche contient du nitrure de fer et/ou du carbure de fer, et une surface de matériau de base présente une dureté élevée ; par conséquent, la déformation microscopique de la surface de coulissement est faible et une augmentation de l'aire de contact réelle peut être supprimée, empêchant ainsi un glissement saccadé. 本発明の摺動式スプライン軸装置は、雄スプラインと、上記雄スプラインに対し軸方向に摺動可能に嵌合する雌スプラインと、を備え、少なくとも一方のスプラインが表面処理層を有する。　そして、上記表面処理層が、アンダーコート層と、リン酸塩を含む中間層と、固体潤滑剤を含むトップコート層と、を順に有し、上記アンダーコート層が、窒化鉄及び／又は炭化鉄を含んでおり、基材表面の硬度が高いため、摺動面の微視的な変形を小さくし、真実接触面積の増加を抑制してスティックスリップを防止できる。