US 9,810,215 B2
Internal gear pump
Takuya Ishii, Mie (JP); Masato Shimoda, Mie (JP); Hajime Asada, Mie (JP); and Kei Hattori, Mie (JP)
Assigned to NTN CORPORATION, Osaka (JP)
Appl. No. 14/420,351
Filed by NTN CORPORATION, Osaka (JP)
PCT Filed Jul. 26, 2013, PCT No. PCT/JP2013/070288
§ 371(c)(1), (2) Date Feb. 6, 2015,
PCT Pub. No. WO2014/024701, PCT Pub. Date Feb. 13, 2014.
Claims priority of application No. 2012-175875 (JP), filed on Aug. 8, 2012; and application No. 2012-240171 (JP), filed on Oct. 31, 2012.
Prior Publication US 2015/0204325 A1, Jul. 23, 2015
Int. Cl. F04C 2/00 (2006.01); F04C 2/08 (2006.01); F04C 15/06 (2006.01); F04C 2/14 (2006.01); F01C 21/10 (2006.01); F04C 2/10 (2006.01); F04C 11/00 (2006.01)
CPC F04C 2/14 (2013.01) [F01C 21/10 (2013.01); F04C 2/086 (2013.01); F04C 2/102 (2013.01); F04C 15/06 (2013.01); F04C 11/005 (2013.01); F04C 2210/14 (2013.01); F04C 2230/21 (2013.01); F04C 2230/22 (2013.01); F04C 2230/231 (2013.01); F04C 2240/51 (2013.01); F05C 2253/20 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An internal gear pump comprising a trochoid in which an inner rotor having a plurality of outer teeth is eccentrically and rotatably accommodated in an outer rotor having a plurality of inner teeth, the outer teeth meshing with the inner teeth, and a suction-side chamber for suctioning liquid and a discharge-side chamber for discharging liquid suctioned into the suction-side chamber are formed between the inner teeth and outer teeth; said internal gear pump being characterized by comprising a casing in which is formed a recess for accommodating the trochoid and a cover for closing off the recess of the casing, at least some of the casing being a body injection-molded from a resin composition,
wherein the casing and the cover are securely bolted,
wherein the casing has a flange part, the flange part being part of the body injection-molded, and
wherein a sintered metal bushing is provided integrally during injection molding in a bolt fixing hole portion in the flange part.