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Thrust needle roller bearing, support structure receiving thrust load of compressor for car air-conditioner, support structure receiving thrust load of automatic transmission, support structure for no

A roller bearing, thrust load technology, applied in roller bearings, needle roller bearings, machines/engines, etc., can solve problems such as early damage

Inactive Publication Date: 2008-10-29
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since it is used under such harsh conditions of thin lubrication, when the differential sliding of the roller is large, early damage may occur due to surface damage such as surface origin type peeling.

Method used

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  • Thrust needle roller bearing, support structure receiving thrust load of compressor for car air-conditioner, support structure receiving thrust load of automatic transmission, support structure for no
  • Thrust needle roller bearing, support structure receiving thrust load of compressor for car air-conditioner, support structure receiving thrust load of automatic transmission, support structure for no
  • Thrust needle roller bearing, support structure receiving thrust load of compressor for car air-conditioner, support structure receiving thrust load of automatic transmission, support structure for no

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0142] Embodiments of the present invention are described below.

[0143] Steel sheets that can be stamped are prepared with SUJ2 material (JIS standard: high-carbon chromium bearing steel), SCM415M (JIS standard: chrome-molybdenum steel), and S70C (JIS standard: carbon steel for machine structures). And the track disk (thickness is less than 3mm) and roller made of steel belt. Various heat treatments were applied to the track disks and rollers. As the heat treatment is image 3 and Figure 4 Heat treatment (special heat treatment), cyanide treatment, quenching (full quenching, high temperature quenching, secondary quenching), carburizing, etc. of the heat map shown.

[0144] In the special heat treatment, cyanide treatment is performed at a temperature of 840°C for a certain period of time in an atmosphere of a mixed gas of RX gas and ammonia gas, and then quenched once at this temperature, and then tempered at a temperature of 230°C. Next, it was reheated to 800°C, which...

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Abstract

A thrust needle roller bearing (10A) having a bearing washer (1) made from a thin steel plate and a needle roller (2), wherein at least the bearing washer (1) has a nitrogen-rich layer in its surface layer portion, and the surface layer portion contains retained austenite in an amount of 5 to 25 vol % and has an austenite grain size number of 11 or higher. The above thrust needle roller bearing exhibits good resistance to the early failure by the damage of a surface such as the exfoliation starting from the surface and to the general fatigue owing to rolling and depending on the load imposed thereon, and thus has a long life.

Description

technical field [0001] The present invention relates to a thrust needle roller bearing, a supporting structure for bearing the thrust load of a vehicle air-conditioning compressor, a supporting structure for bearing the thrust load of an automatic transmission, a supporting structure for a continuously variable transmission, and a supporting structure for bearing the thrust load of a manual transmission support structure. Background technique [0002] Thrust needle roller bearings are composed of needle rollers, cages and track disks, and have a structure in which the needle rollers and track disks are in line contact, so they have a small bearing projected area but can obtain high load capacity and high rigidity The advantages. Therefore, the thrust needle roller bearing is used, for example, in a support structure of a vehicle air-conditioning compressor, a support structure of a transmission (manual transmission, automatic transmission, and continuously variable transmis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C33/62F16C19/30F16C19/46F16H41/24F04B27/08F04B39/00
Inventor 渡边靖之尾林光介
Owner NTN CORP