Crank position sensor wheel and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2016202145-A1
Application number	US-201514807487-A
Country	US
Kind code	A1
Filing date	Jul 23, 2015
Priority date	Jan 14, 2015
Publication date	Jul 14, 2016
Grant date	—

Abstract

A crank position sensor wheel comprises a core portion and a surface portion, wherein the surface portion comprises iron and carbon, the surface portion being 0.02% or less by weight carbon, and the core portion comprises iron and carbon, the core portion being between 0.05 and 0.20% by weight carbon.

First claim

What is claimed is:

1 . A crank position sensor wheel comprising a core portion and a surface portion,
wherein the surface portion comprises iron and carbon, the surface portion being 0.02% or less by weight carbon, and the core portion comprises iron and carbon, the core portion being between 0.05 and 0.20% by weight carbon.

2 . The crank position sensor wheel of claim 1 , wherein
the surface portion and the core portion further comprise molybdenum at 0.7 to 0.9% by weight and phosphorus at 0.4 to 0.5% by weight.

3 . The crank position sensor wheel of claim 2 , wherein the surface portion is 200 to 300 mm deep from an outside surface of the crank position sensor wheel.

4 . The crank position sensor wheel of claim 3 , wherein the surface portion is 95% or more ferrite by volume.

5 . The crank position sensor wheel of claim 4 , wherein the core portion is 5 to 10% pearlite by volume.

6 . The crank position sensor wheel of claim 1 , wherein
a value of 3425.09·e −17.47 [C]+9272.4·[P] 2 −7340.16·[P]−757.62−[Mo]+2782.298 is 1300 or more, where [C] represents the weight percent of carbon, [P] represents the weight percent of phosphorus, and [Mo] represents the weight percent of molybdenum.

7 . The crank position sensor wheel of claim 6 , wherein strength of the crank position sensor wheel is 450 MPa or more.

8 . A method for manufacturing a crank position sensor wheel, comprising steps of:
forming a metal powder comprising iron and carbon, the metal powder being between 0.05 and 0.20% by weight carbon; and sintering the metal powder in a sintering furnace, wherein an atmosphere of the sintering furnace has a carbon potential (cp) of 0.05 v/v % or less.

9 . The method of claim 8 , wherein the metal powder further comprises molybdenum at 0.7 to 0.9% by weight and phosphorus at 0.4 to 0.5% by weight.

10 . The method of claim 9 , wherein:
the sintering furnace comprises a preheater, a high-temperature sintering oven, and a cooler, the preheater has a temperature between 425 and 1040° C., and the high-temperature sintering oven has a temperature between 1100 and 1200° C.

11 . The method of claim 8 , wherein,
in the metal powder, the value of 3425.09·e −17.47 [C]+9272.4·[P] 2 −7340.16·[P]−757.62·[Mo]+2782.298 is 1300 or more, where [C] represents the weight percent of carbon, [P] represents the weight percent of phosphorus, and [Mo] represents the weight percent of molybdenum.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Kim Shingyu
• Lee Bora
• Kim Haksoo

Classifications

• B22F2999/00

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

• G01M15/06 Primary

  by monitoring positions of pistons or cranks · CPC title

• B22F3/10

  Sintering only · CPC title

• B22F3/12

  Both compacting and sintering (by forging B22F3/17) · CPC title

• B22F3/1007 Primary

  Atmosphere (B22F3/1021 takes precedence) · CPC title