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Patent Searching and Data


Title:
INTERNAL GEAR PUMP
Document Type and Number:
WIPO Patent Application WO/2014/024701
Kind Code:
A1
Abstract:
Provided is an internal gear pump which can be manufactured at low cost with fewer mechanical processing steps and which also has a high safety factor in functioning. This internal gear pump (1) has a trochoid (4) in which an inner rotor (3) having multiple outer teeth is rotatably housed inside of an outer rotor (2) having multiple inner teeth in an eccentric state in which the outer teeth mesh with said inner teeth. Between the inner teeth and the outer teeth in said trochoid are formed an inlet-side volume chamber where a liquid is intaken and an outlet-side volume chamber where the liquid intaken in the inlet-side volume chamber is discharged. The internal gear pump (1) also includes a casing (5) in which a recess (5a) housing the trochoid (4) is formed, and a cover (6) which closes the recess (5a) of the casing (5). At least one part of the casing (5) is an injection molded body of a resin composition. There is a groove (5d) in the portion which seals the outer periphery of the recess (5a) of the casing (5), and a seal ring (13) is installed in said groove. In screw hole sections, sintered metal bushings (7) are provided integrally during injection molding.

Inventors:
ISHII TAKUYA (JP)
SHIMODA MASATO (JP)
ASADA HAJIME (JP)
HATTORI KEI (JP)
Application Number:
PCT/JP2013/070288
Publication Date:
February 13, 2014
Filing Date:
July 26, 2013
Export Citation:
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Assignee:
NTN TOYO BEARING CO LTD (JP)
International Classes:
F04C2/10; F04C15/00
Foreign References:
JPH0547457U1993-06-25
JP2010150964A2010-07-08
JPH10196809A1998-07-31
JP2007263019A2007-10-11
JPS57121485U1982-07-28
JPH07208348A1995-08-08
JP2003129966A2003-05-08
JP4215160B22009-01-28
JP4726116B22011-07-20
Other References:
See also references of EP 2896833A4
Attorney, Agent or Firm:
WAKI, Misao et al. (JP)
Wake 操 (JP)
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