INSCRIBED GEAR PUMP

WIPO Patent Application WO/2017/057533

A1

Provided is an inscribed gear pump with which sealing can be stably ensured between a cover and a plastic casing constituting a trochoid housing part, a seal ring can be omitted in this portion, and discharge capability can be stabilized. An inscribed gear pump 1 has a trochoid 4 in which an inner rotor 3 having a plurality of external teeth is eccentrically accommodated within an outer rotor 2 having a plurality of internal teeth such that the external teeth mesh with the internal teeth, a casing 5 in which a trochoid-accommodating recess 5a is formed, and a cover 6 that closes off the recess 5a. The casing 5 is an extrusion-molded compact of a resin composition, the casing 5 and cover 6 are secured by a bolt, a bolt-securing hole portion of the casing 5 has a metal bushing 7, and in a cross-section of the juncture between the casing 5 and the cover 6, the position of an end surface 7a of the bushing 7 is higher than a bushing-forming surface 5e in a bushing periphery of the casing 5 and lower than a seal surface 5d in a recess periphery of the casing 5, as viewed from a bottom surface 5a of the recess 5a.

ASADA HAJIME (JP)
HATTORI KEI (JP)
ITO TAKAYUKI (JP)
AKAI HIROSHI (JP)

PCT/JP2016/078755

April 06, 2017

September 29, 2016

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NTN TOYO BEARING CO LTD (JP)

F04C2/10; F04C15/00

JP2014051964A	2014-03-20
JPS5965963U	1984-05-02
JPH09250640A	1997-09-22
JPH0519730U	1993-03-12
JP2014206133A	2014-10-30
JP2015113810A	2015-06-22

WAKI, Hikaru et al. (JP)

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