Trochoid pump with air ejection port

Patent metadata

Field	Value
Publication number	US-9784270-B2
Application number	US-201414910260-A
Country	US
Kind code	B2
Filing date	Aug 11, 2014
Priority date	Aug 12, 2013
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

An air ejection port for ejecting air-mixed oil is structured with a first air ejection port provided on the inner peripheral side from an inscribed circle of an outer rotor and a second air ejection port provided on the outer peripheral side from a circumscribed circle of the inner rotor, the air ejection port can have an enlarged port area as the total of area of the first air ejection port and area of the second air ejection port in a state without being in communication with either of a suction port and a discharge port, and a disadvantage that a pump chamber of a previous stroke and a pump chamber of a subsequent stroke communicate with each other through the air ejection port can be avoided.

First claim

The invention claimed is:

1. A trochoid pump with an air ejection port, comprising:
a casing;
an outer rotor, rotatably arranged in the casing; and
an inner rotor, rotatably arranged inside the outer rotor to perform sucking and pressure-feeding of an oil in cooperation with the outer rotor;
wherein the casing including: a suction port through which the oil is sucked in a sucking stroke, an air ejection port through which a part of air-mixed oil is ejected in an air ejecting stroke subsequent to the sucking stroke, and a discharge port through which the oil is discharged in a discharging stroke subsequent to the air ejecting stroke;
the air ejection port including: a first air ejection port provided on an inner peripheral side from an inscribed circle of the outer rotor, and a second air ejection port provided on an outer peripheral side from a circumscribed circle of the inner rotor.

2. The trochoid pump with an air ejection port according to claim 1 , wherein
the second air ejection port is arranged at a position close to the circumscribed circle of the inner rotor on the outer peripheral side from the circumscribed circle.

Assignees

• Mikuni Kogyo Kk

Inventors

• Oda Hiroyuki
• Naiki Takehiko
• KAIHO Yuya

Classifications

• F04C2/103

  one member having simultaneously a rotational movement about its own axis and an orbital movement · CPC title

• F04C13/007

  Venting; Gas and vapour separation during pumping (preventing vapour lock in fuel pumps F02M37/20, in centrifugal pumps F04D9/00) · CPC title

• F04C2/10

  of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member · CPC title

• F04C15/06 Primary

  Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet · CPC title

• F04C13/001

  Pumps for particular liquids · CPC title