Invention Grant
- Patent Title: Internal gear pump
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Application No.: US14420351Application Date: 2013-07-26
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Publication No.: US09810215B2Publication Date: 2017-11-07
- Inventor: Takuya Ishii , Masato Shimoda , Hajime Asada , Kei Hattori
- Applicant: NTN CORPORATION
- Applicant Address: JP Osaka
- Assignee: NTN CORPORATION
- Current Assignee: NTN CORPORATION
- Current Assignee Address: JP Osaka
- Agency: Hedman & Costigan, P.C.
- Agent James V. Costigan; Kathleen A. Costigan
- Priority: JP2012-175875 20120808; JP2012-240171 20121031
- International Application: PCT/JP2013/070288 WO 20130726
- International Announcement: WO2014/024701 WO 20140213
- Main IPC: F04C2/00
- IPC: F04C2/00 ; F04C2/08 ; F04C15/06 ; F04C2/14 ; F01C21/10 ; F04C2/10 ; F04C11/00

Abstract:
Provided is an internal gear pump requiring fewer machining steps, allowing inexpensive manufacture, and offering high safety from the standpoint of function. The internal gear pump 1 comprises: a trochoid 4 in which an inner rotor 3 having a plurality of outer teeth is eccentrically and rotatably accommodated in an outer rotor 2 having a plurality of inner teeth, the outer teeth meshing with the inner teeth, and in which a suction-side chamber for suctioning liquid and a discharge-side chamber for discharging liquid that has been suctioned into the suction-side chamber are formed in between the inner teeth and outer teeth; a casing 5 in which is formed a recess 5a for accommodating the trochoid 4; and a cover 6 for closing off the recess 5a of the casing 5. At least some of the casing 5 is a body injection-molded from a resin composition. The invention also comprises a groove 5d in a portion of the recess 5a of the casing 5 in which the outer periphery is sealed, with a sealing ring 13 installed therein, and bushings 7 made from sintered metal that are provided integrally during injection molding in bolt fixing hole portions.
Public/Granted literature
- US20150204325A1 INTERNAL GEAR PUMP Public/Granted day:2015-07-23
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