INTERNAL GEAR PUMP

• Main Authors: ITO TAKAYUKI, HATTORI KEI, AKAI HIROSHI
• Format: Patent
• Language: English; Japanese
• Published: 26.03.2020
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTMACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTPUMPS; WEAPONS

To provide an internal gear pump which can position a trochoid by a simple structure, and can prevent the positional displacement and an inclination of the trochoid.SOLUTION: An internal gear pump 1 has a trochoid 4 in which an inner rotor 3 is rotatably accommodated in an outer rotor 2, and a suction-side volume chamber and a discharge-side volume chamber are formed, a casing 5 in which an accommodation part 8 for accommodating the trochoid 4 is formed, and a cover 6 for blocking the accommodation part 8 of the casing 5. An inside face 8b of the accommodation part 8 of the casing 5 is formed of an injection molded body having a resin composition, a bottom face 8a of the accommodation part 8 is formed of a metal plate 7 which is integrally arranged therewith at injection molding, the inner rotor 3 has a salient part 3a salient to one end face in an axial direction, the metal plate 7 has a recess 7 into which the salient part 3a is fit, and the salient part 3a of the inner rotor 3 is fit into the recess 7a of the metal plate 7.SELECTED DRAWING: Figure 3 【課題】簡易な構造でトロコイドの位置決めが可能であり、トロコイドの位置ずれや傾きを防止できる内接歯車ポンプを提供する。【解決手段】アウタロータ２内にインナロータ３が回転自在に収容され、吸入側容積室と吐出側容積室とが形成されるトロコイド４と、トロコイド４を収容する収容部８が形成されたケーシング５と、ケーシング５の収容部８を閉塞するカバー６とを有する内接歯車ポンプ１であって、ケーシング５の収容部８の内側面８ｂが、樹脂組成物の射出成形体からなり、収容部８の底面８ａが、射出成形時に一体に設けられた金属プレート７からなり、インナロータ３は軸方向一方の端面に、突出した凸部３ａを有し、金属プレート７は凸部３ａが嵌合される凹部７ａを有しており、インナロータ３の凸部３ａが金属プレート７の凹部７ａに嵌合されている。【選択図】図３