Steel for CVJ ball cages

A technology of isolation rings and balls, applied in furnace types, couplings, furnaces, etc., can solve the problems of high alloy cost, reduced manufacturability, and reduced life expectancy

Active Publication Date: 2013-12-11
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the carburized steels proposed in these patent documents all have the problems of higher alloy cost and lower manufacturability than steels specified in JIS.
There is also a problem that the life span is reduced compared with the conventional

Method used

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  • Steel for CVJ ball cages
  • Steel for CVJ ball cages
  • Steel for CVJ ball cages

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0077] Steel materials with the chemical compositions shown in Table 1 and Table 2 were smelted, hot forged and rolled to produce a 25mm thick, 120mm wide, and 550mm long plate, and after normalizing at 920°C, tempering was performed at 720°C. Fire to soften it. Next, after removing the surface scale, it was cold-worked to a thickness of 16 mm, and tempered again at 720° C. to soften it.

[0078] Table 1

[0079]

[0080] Table 2

[0081]

[0082] A smooth tensile test piece with a diameter of 8 mm in the parallel portion and a notched tensile test piece with a diameter of 8 mm in the parallel portion and a notch with a depth of 1 mm were taken from the raw material in the T direction, which is a direction perpendicular to the rolling direction. . Then, carburizing treatment and heat treatment were performed on the test piece under the following conditions.

[0083] First, carburizing was carried out at 930° C. for 130 minutes at a carbon potential of 0.9%, followe...

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Abstract

A steel for CVJ ball cages which contains by mass C: 0.1 to 0.25%, Si: 0.05 to 0.7%, Mn: 0.05 to 1.2%, Cr: 0.3 to 1.2%, S: 0.005% or below, P: 0.03% or below, N: 0.02% or below, O (oxygen): 0.01% or below, and sol. Al: 0.005 to 0.1% with the balance consisting of Fe and unavoidable impurities, which may further contain one or more elements selected from among Mo, Ni, Ti, V and Zr instead of part of Fe, and which can attain a sufficient lifetime even when used for a ball cage of a downsized and lightened CVJ to be subjected to a stress greater than conventional.

Description

technical field [0001] The present invention relates to a steel used for ball cage parts of constant velocity joints (CVJ) of automobiles and the like. Background technique [0002] like figure 1 As shown, the constant velocity joint (hereinafter abbreviated as CVJ) used to transmit power from the driving axle to the driven axle of the automobile is such a structure, that is, the inner race (inner race) ( A plurality of balls 5 are inserted between an inner race (outer race) 3 and an outer race (outer race) 4 fixedly provided on the driven shaft 2 , and these balls are held by a ball spacer 6 . Since the ball spacer 6 and the inner ring 3 have to transmit a very large rotational force on the mechanism, therefore, higher strength, toughness and fatigue strength are required. [0003] Therefore, for these parts, carburized steel (case-harde ned steel), which is endowed with high surface hardness and rotational fatigue resistance by carburizing and quenching, is used. As carb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C22C38/18C22C38/50F16D3/20C21D1/06
CPCF16D3/223C22C38/002C21D9/40F16D2003/22303C22C38/04C22C38/22C22C38/44C22C38/50F16D2003/22316C22C38/48C22C38/06C22C38/02F16D2250/00C22C38/18
Inventor 近藤邦夫山本忠之
Owner NIPPON STEEL CORP
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