METHOD OF PRODUCING RESIN-MADE GEAR

• Main Authors: OZAWA MASAYA, KAMIHOGI YUTETSU, MORIKAWA TAKAHIRO, FURUHATA NAOKI
• Format: Patent
• Language: English; Japanese
• Published: 25.12.2014
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; BLASTING; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PROBLEM TO BE SOLVED: To provide a method of producing a resin-made gear composed of dissimilar material layers which suppresses detachment of a dissimilar material layer in the laminate boundary and prevents deterioration of the life of the gear even when changes of teeth occur.SOLUTION: A method of producing a resin-made gear includes a first step of carrying out twice or more, in a wet state, a step of charging a slurry which contains at least a short fiber and a powder resin as constituents and is prepared by mixing the constituents with water, into a preliminarily molding die, and discharging water to accumulate the constituents in the preliminary molding die so as to form an accumulation layer, a second step of compressing, in the thickness direction, a plurality of the accumulation layers obtained by carrying out the step of forming the accumulation layer twice or more to form a molding blank, a third step of molding the molding blank with heating and pressing to form a resin molding, and a fourth step of processing the resin molding into a tooth part of an oblique-tooth gear. The constituent ratio of individual constituents and/or the types of the constituents are modified between both accumulation layers so that the accumulation layer on the side where an asymmetrical contact of the resin-made gear with a counter gear to be engaged in occurs is higher in strength than the accumulation layer on the other side. 【課題】異種材料層から構成された樹脂製歯車の製造に関し、異種材料層の積層界面で剥離が発生しにくくし、歯筋の変移が生じた場合にも、歯車の寿命低下を防ぐ。【解決手段】構成物として少なくとも短繊維と粉末状樹脂を含み前記構成物と水とを混合したスラリを、予備成形金型に投入して水を排出することにより、予備成形金型内に前記構成物を集積させて集積層となす工程を湿潤状態で複数回実施する第１のステップと、集積層となす工程を複数回実施して得た複数の集積層を厚さ方向に圧縮して成形素材を形成する第２のステップと、成形素材を加熱加圧成形して樹脂成形体を形成する第３のステップと、樹脂成形体を斜歯歯車の歯部に加工する第４のステップを経る。ここで、噛み合う相手歯車に対し樹脂製歯車の片当りが起こる側の集積層が、他側の集積層より強度が大きくなるよう、両集積層の間で、各構成物の構成比及び／又は構成物の種類を異ならせる。【選択図】 図６