Oil pump having housing with seal portion

Patent metadata

Field	Value
Publication number	US-11519406-B2
Application number	US-202017104090-A
Country	US
Kind code	B2
Filing date	Nov 25, 2020
Priority date	Nov 29, 2019
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

A pump housing of an oil pump includes a suction port that supplies oil to a pump room, a discharge port that discharges oil from the pump room, and a seal portion that suppresses leakage of oil from the pump room to outside of the pump room. A shaft of the oil pump includes a small diameter portion and a large diameter portion having different diameters, the small diameter portion is connected to the inner rotor, and the shaft and the inner rotor integrally rotate. The seal portion is in contact with a side surface of the inner rotor extending in a diameter direction of the shaft, and also extends to a region in the diameter direction on an inner side smaller than the large diameter portion in the diameter direction.

First claim

The invention claimed is:

1. An oil pump, comprising:
a pump housing including a rotor housing space inside;
an inner rotor and an outer rotor being housed in the rotor housing space;
a pump room being formed by the inner rotor and the outer rotor in the pump housing; and
a shaft being inserted through the inner rotor, wherein
the pump housing includes 1) a suction port that supplies oil to the pump room, 2) a discharge port that discharges oil from the pump room, and 3) a seal portion that suppresses leakage of oil from the pump room to outside of the pump room,
the shaft includes a small diameter portion and a large diameter portion having different diameters, the small diameter portion is connected to the inner rotor, and the shaft and the inner rotor integrally rotate,
the seal portion is in contact with a side surface of the inner rotor extending in a diameter direction of the shaft, and also extends to a region in the diameter direction on an inner side smaller than the large diameter portion in the diameter direction,
the shaft is in non-contact with the seal portion, and,
in a shaft direction of the shaft, the shaft is supported by a portion of the pump housing on one side in the shaft direction with respect to the seal portion and the inner rotor and a portion of the pump housing on another side in the shaft direction with respect to the seal portion and the inner rotor.

2. The oil pump according to claim 1 , wherein
a surface that connects the small diameter portion and the large diameter portion is inclined with respect to the shaft direction of the shaft.

3. The oil pump according to claim 2 , wherein
a distance from an inner surface of the suction port and the discharge port to a shaft core of the shaft is shorter than a distance from a tooth bottom of the inner rotor to the shaft core.

4. The oil pump according to claim 1 , wherein
a distance from an inner surface of the suction port and the discharge port to a shaft core of the shaft is shorter than a distance from a tooth bottom of the inner rotor to the shaft core.

Assignees

• Aisin Corp

Inventors

• Isoda Atsuo
• Ide Kenta
• Kishi Masato
• HORIKAWA Kazuya
• Tanaka Tokiyuki

Classifications

• F04C2210/206

  Oil · CPC title

• F04C2240/30

  Casings or housings · CPC title

• F04C13/002

  for homogeneous viscous liquids · CPC title

• F04C15/0023

  Axial sealings for working fluid · CPC title

• F04C2/22 Primary

  of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or with one of the co-operating members being stationary, the inner member having more teeth or tooth-equivalents than the outer member · CPC title