Outer ring for variable oil pump and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-2021252595-A1
Application number	US-202016883466-A
Country	US
Kind code	A1
Filing date	May 26, 2020
Priority date	Feb 17, 2020
Publication date	Aug 19, 2021
Grant date	—

Abstract

An outer ring for a variable oil pump including 0.5 to 0.7% by weight of carbon (C), 2.9 to 3.8% by weight of nickel (Ni), 1.3 to 1.7% by weight of copper (Cu), 0.4 to 0.6% by weight molybdenum (Mo), and a remainder of iron (Fe) and unavoidable impurities, in which austenite occupies less than 15% of a total area, and a method of manufacturing the same are provided, and a method of manufacturing the same are provided.

First claim

What is claimed is:

1 . An outer ring for a variable oil pump comprising:
an amount of about 0.5 to 0.7% by weight of carbon (C); an amount of about 2.9 to 3.8% by weight of nickel (Ni); an amount of about 1.3 to 1.7% by weight of copper (Cu); an amount of about 0.4 to 0.6% by weight molybdenum (Mo); and a remainder of iron (Fe) and unavoidable impurities, all the % by weight based on the total weight of the outer ring, wherein austenite occupies less than 15% of a total area of the outer ring.

2 . The outer ring for the variable oil pump of claim 1 , wherein the outer ring has a yield strength of about 400 MPa or greater, which is measured by a method of ISO 2740, a tensile strength of about 670 MPa or greater, and a hardness of about 92 HRB or greater, which is measured by Rockwell B scale.

3 . A variable oil pump for a vehicle comprising an outer ring of claim 1 .

4 . A method of manufacturing an outer ring for a variable oil pump, comprising:
preparing a composition comprising a first diffusion bonding powder, a second diffusion bonding powder and a carbon powder; preparing a sintered body by compacting and sintering the composition; and sizing an outer ring from the sintered body by machining of inner diameter and both-sided of the sintered body, wherein the first diffusion bonding powder has a greater nickel (Ni) content than the second diffusion bonding powder, and wherein the outer ring comprises an amount of about 0.5 to 0.7% by weight of carbon (C), an amount of about 2.9 to 3.8% by weight of nickel (Ni), an amount of about 1.3 to 1.7% by weight of copper (Cu), an amount of about 0.4 to 0.6% by weight molybdenum (Mo), and a remainder of iron (Fe) and unavoidable impurities, % by weight based on the total weight of the outer ring, and austenite occupies less than 15% of a total area of the outer ring.

5 . The method of claim 4 , wherein the first diffusion bonding powder comprises an amount of about 3.5 to 4.5% by weight of nickel (Ni), an amount of about 1.3 to 1.7% by weight of copper (Cu), an amount of about 0.4 to 0.6% by weight of molybdenum (Mo), and the remainder of iron (Fe) and unavoidable impurities, % by weight based on the total weight of the first diffusion bonding powder.

6 . The method of claim 4 , wherein the second diffusion bonding powder comprises an amount of about 1.5 to 2.0% by weight of nickel (Ni), an amount of about 1.3 to 1.7% by weight of copper (Cu), an amount of about 0.4 to 0.6% by weight of molybdenum (Mo), and the remainder of iron (Fe) and unavoidable impurities, % by weight based on the total weight of the second diffusion bonding powder.

7 . The method of claim 4 , wherein the composition comprises an amount of about 55 to 85 parts by weight of the first diffusion bonding powder and an amount of about 15 to 45 parts by weight of the second diffusion bonding powder.

8 . The method of claim 4 , wherein the sintering is carried out for about 20 to 50 minutes at a temperature of about 1,100 to 1,200° C.

9 . The method of claim 4 , wherein the sintering uses a sintering gas comprising an amount of about 75 to 95 parts by weight of nitrogen and 5 to 25 parts by weight of hydrogen.

10 . The method of claim 4 , further comprising:
performing an ion nitration treatment after the machining of inner diameter.

11 . The method of claim 10 , wherein the ion nitration treatment is performed after the machining of inner diameter before the machining of both-sided.

12 . The method of claim 10 , wherein the ion nitration treatment is performed at a temperature of about 450 to 600° C. for about 2 to 10 hours.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Kim Hak Soo
• Kim Sung Min

Classifications

• B22F2003/242

  Coating · CPC title

• B22F2003/247

  Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface · CPC title

• B22F2003/248

  Thermal after-treatment · CPC title

• B22F2301/35

  Iron · CPC title

• B22F2999/00

  Aspects linked to processes or compositions used in powder metallurgy · CPC title