Pump

Patent metadata

Field	Value
Publication number	US-9745977-B2
Application number	US-201514713051-A
Country	US
Kind code	B2
Filing date	May 15, 2015
Priority date	May 23, 2014
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

A pump includes: a housing in which a pump chamber accommodating an inner rotor and an outer rotor is formed in a pump chamber formation surface, and an O-ring groove is formed around the pump chamber; an O-ring that is placed in the O-ring groove; and a plate that is attached to the pump chamber formation surface and closely contacts the O-ring to close the pump chamber. Inter-hole grooves connecting to an outer edge of the pump chamber formation surface are formed around the O-ring groove.

First claim

What is claimed is:

1. A pump, comprising:
a housing having a pump chamber formation surface, wherein a pump chamber accommodating a rotary member extends into the housing from the pump chamber formation surface;
an O-ring groove formed around the pump chamber in the pump chamber formation surface;
an O-ring is placed in the O-ring groove;
a plate attached to the pump chamber formation surface and closely contacting the O-ring to close the pump chamber; and
a discharge recess provided in the housing, the discharge recess being recessed with respect to the pump chamber formation surface, to be separated from the plate, the discharge recess surrounding an entirety of the circumference of the O-ring groove and extending from the outer edge of the housing to the outer edge of the pump chamber formation surface.

2. The pump according to claim 1 , further comprising through holes, through which bolts for attaching the housing to the plate may be inserted, extend in the housing to the pump chamber formation surface,
wherein the discharge recess is formed by the through holes and an inter-hole groove that connects the through holes.

3. The pump according to claim 2 , further comprising drain grooves extending from the through holes to the outer edge of the housing.

4. The pump according to claim 2 , wherein
the inter-hole groove is formed such that its width in a direction parallel to the pump chamber formation surface decreases toward the through holes.

5. The pump according to claim 1 , wherein
the discharge recess connects to the outer edge of the pump chamber formation surface at least at two positions.

6. The pump according to claim 5 , wherein
the discharge recess opens downward in a direction of gravity.

Assignees

• Jtekt Corp

Inventors

• Sakata Takatoshi

Classifications

• F04C11/001

  of similar working principle · CPC title

• F04C2/086

  Carter · CPC title

• F04C2/102

  the two members rotating simultaneously around their respective axes · CPC title

• F04D13/0666

  the motor being of the plane gap type · CPC title

• F01C19/005

  Structure and composition of sealing elements such as sealing strips, sealing rings and the like; Coating of these elements (vane construction F01C21/0809; piston rings and ring sealings of similar construction in general F16J9/00) · CPC title