Title:
INTERNAL GEAR PUMP
Document Type and Number:
WIPO Patent Application WO/2023/243665
Kind Code:
A1
Abstract:
An internal gear pump (1) comprises a pinion gear (3), a ring gear (4), a housing (10), and a crescent (54) having a first arcuate wall (541) with which external teeth (31) come into contact, and a second arcuate wall (542) with which internal teeth (41) come into contact, wherein: the first arcuate wall and the second arcuate wall are both fixed walls that do not move toward the external teeth or the internal teeth; a pressure transmission oil passage (91) extending from a discharge port is formed inside the housing, in only a ring gear side region among a pinion gear side region and the ring gear side region, which sandwich the crescent; and the pressure transmission oil passage provides communication between the discharge port and a space between teeth of the ring gear.
Inventors:
SEKI NAKORI (JP)
ONISHI TAKAAKI (JP)
TAKEDA HIROAKI (JP)
ONISHI TAKAAKI (JP)
TAKEDA HIROAKI (JP)
Application Number:
PCT/JP2023/022105
Publication Date:
December 21, 2023
Filing Date:
June 14, 2023
Export Citation:
Assignee:
SUMITOMO PRECISION PROD CO (JP)
International Classes:
F04C2/10
Foreign References:
| JPH04203373A | 1992-07-23 | |||
| JPH11229802A | 1999-08-24 | |||
| DE1553014A1 | 1969-08-21 |
Attorney, Agent or Firm:
MAEDA & PARTNERS (JP)
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