Constituent member of bearing, process for production of same, and ball-and-roller bearing provided with the constituent member

A component and bearing technology, applied in the direction of manufacturing tools, bearing components, bearings, etc., can solve problems such as hindering smooth rotation, and achieve the effect of ensuring static load capacity, sufficient static load capacity, and long life.

Inactive Publication Date: 2011-11-16
JTEKT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This permanent deformation increases as the load increases, and when the critical load (static rated load) is exceeded, it prevents smooth rotation

Method used

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  • Constituent member of bearing, process for production of same, and ball-and-roller bearing provided with the constituent member
  • Constituent member of bearing, process for production of same, and ball-and-roller bearing provided with the constituent member
  • Constituent member of bearing, process for production of same, and ball-and-roller bearing provided with the constituent member

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0101] Next, a bearing component according to a first embodiment of the present invention will be described with reference to the drawings. figure 1 It is a schematic explanatory diagram showing a ball bearing which is a rolling bearing including an inner ring, an outer ring, and balls as an example of bearing components according to the first embodiment of the present invention.

[0102] The ball bearing 10 includes: an inner ring 1 having a raceway portion 1a on its outer peripheral surface; an outer ring 2 having a raceway portion 2a on its inner peripheral surface; The balls 3 as a plurality of rolling elements and the cage 4 retain the plurality of balls 3 at predetermined intervals in the circumferential direction.

[0103] The surfaces of the raceway portion 1a, the end surface 1b, the shoulder surface 1c, and the inner peripheral surface 1d of the inner ring 1 are ground portions that have been finely ground. On the other hand, the chamfer 1e on the inner peripheral s...

no. 2 approach

[0155] [Bearing Components and Rolling Bearings Equipped with the Bearing Components]

[0156] Next, an outer ring as a bearing component according to a second embodiment of the present invention will be described with reference to the drawings. Regarding the second embodiment, similarly to the example of the rolling bearing of the first embodiment, the figure 1 Be explained. That is, using the same reference numerals for the same parts, below, based on figure 1 Be explained. figure 1 It is a schematic explanatory diagram showing the structure of a ball bearing as a rolling bearing including a bearing component (outer ring) according to a second embodiment of the present invention.

[0157] Like the first embodiment, the ball bearing 10 of the second embodiment includes an outer ring 2 having a raceway portion 2a on the inner peripheral surface, an inner ring 1 having a raceway portion 1a on the outer peripheral surface, and disposed on the inner and outer rings 1, Balls 3...

Embodiment 1-1～1-3 and comparative example 1-1～1-7

[0219] Two types of steel materials A and B having the compositions shown in Table 1 were used respectively, processed into predetermined shapes, and respective molding materials for the inner and outer rings of ball bearings (type 6206) with grinding allowances at the parts forming the raceway surfaces were manufactured. Steel material B in Table 1 is JIS SUJ2 which is a bearing steel. In addition, the diameter of the rolling elements is 9.525mm.

[0220] [Table 1]

[0221]

[0222] Next, for the obtained molding raw material, in Figure 3 ~ Figure 12 Heat treatment was performed under the heat treatment conditions shown, and the portion forming the above-mentioned raceway surface of the obtained heat-treated intermediate material was subjected to grinding processing to manufacture Examples 1-1 to 1-3 and Comparative Examples 1-1 to 1-7. The combination of inner and outer rings. Specifically, in the combinations of the inner and outer rings of Examples 1-1 to 1-3 and Co...

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Abstract

The present invention provides a constituent member of a bearing, which can prolong the life of a ball-and-roller bearing and can ensure sufficient static load carrying capacity and dimensional stability; a process for production of the constituent member; and a ball-and-roller bearing which has a long life and exhibits sufficient static load carrying capacity and dimensional stability. A workpiece obtained by shaping a steel containing 3.2 to 5.0 mass% of Cr and 0.05 to less than 0.5 mass% of V is subjected to heat treatment such as carbonitriding, whereby a constituent member of a ball-and-roller bearing is produced. In the constituent member thus produced, the contents of C and N in the surface layer extending from the surface of the member to a depth of 10[mu]m fall within the ranges of 1.1-1.6 mass% and 0.1-1.0 mass% respectively; the Vickers hardness at a depth of 50[mu]m from the surface falls within the range of 740 to 900 (62-67 in terms of Rockwell C hardness); the content of gamma-iron at a depth of 10[mu]m from the surface falls with the range of 20-55 vol%; vanadium nitride particles having particle diameters of 0.2-2[mu]m and / or vanadium carbonitride particles having particle diameters of 0.2-2[mu]m are made present in the surface layer extending from the surface to a depth of 10[mu]m; and the area fraction of the particles in the surface layer extending from the surface to a depth of 10[mu]m falls within the range of 1-10%.

Description

technical field [0001] The present invention relates to a bearing component, a manufacturing method thereof, and a rolling bearing including the bearing component. Background technique [0002] When rolling bearings are subjected to excessive static loads during use, and when they are subjected to large impact loads when rotating at extremely low speeds, the contact parts between the raceway surfaces of the outer and inner rings and the rolling elements often produce localized permanent deformation. This permanent deformation increases as the load increases, and when the critical load (static rated load) is exceeded, smooth rotation is prevented. For example, in the case of ball bearings, the maximum contact stress between the rolling elements and the raceways of the outer and inner rings is about 4200Mpa. When designing ball bearings, this stress should be considered to determine the static rated load. [0003] The improvement of the static load rating is one of the impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/32C21D1/06C21D1/18C21D9/40C22C38/00C22C38/24F16C33/62F16C33/64
CPCC21D2211/001C22C38/24F16C33/62C22C38/22F16C33/64C21D6/04C21D1/06C23C8/32C21D1/18C21D9/40C22C38/02C22C38/04C22C38/18F16C19/06Y10T29/49679F16C2204/70
Inventor 木泽克彦三上刚尾野健太郎中岛力
Owner JTEKT CORP
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