| 摘要 |
PROBLEM TO BE SOLVED: To provide an internal gear pump which can be manufactured at a low cost by reducing processes of machine work, and is integrally provided with a slide bearing portion having stably high seizure resistance.SOLUTION: An internal gear pump 1 has a trochoid 4 where an inner rotor 3 having a plurality of external teeth is rotatably accommodated in an outer rotor 2 having a plurality of internal teeth in a state that the external teeth are engaged with the internal teeth and decentered, and a suction-side volume chamber for sucking a liquid and a discharge-side volume chamber for discharging the liquid sucked to the suction-side volume chamber, are formed between the internal teeth and the external teeth. The internal gear pump further has a drive shaft 9 fixed to the inner rotor 3, a casing 5 in which a recessed portion 5a for accommodating the trochoid 4 is formed, and a cover 6 for closing the recessed portion 5a of the casing 5. The cover 6 has a slide bearing portion 11 for rotatably supporting the driving shaft 9, and the slide bearing portion 11 is formed by directly injection-molding a thermoplastic resin composition. |
