首页|Preventive measures of fretting wear in railway axle bearings: Combined effect of grooving and amorphous carbon coating towards their backing rings
Preventive measures of fretting wear in railway axle bearings: Combined effect of grooving and amorphous carbon coating towards their backing rings
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NSTL
Elsevier
? 2022 Elsevier LtdFretting wear is surface damage caused by repeated slight relative slips between two contact surfaces. In railway applications, the fretting wear may occur between the inner ring and the backing ring of an axle journal tapered roller bearing. The authors found that a nonuniform pressure distribution between the inner ring and the backing ring deteriorates the fretting wear; a backing ring grooved on its oil seal sliding surface has been proposed to attain a uniform distribution in the radial direction. In this paper, to further reduce the fretting wear, we have conducted a rotation test on a full-scale railway axle bearing with the backing ring both coated its contact surface to the inner ring with diamond-like carbon (DLC) film and grooved its outer surface, and investigated the combined effect of these two approaches on the fretting wear prevention. We have found that the wear prevention effect is superior to the backing ring with only DLC film, but partial decohesion of the DLC film occurs. It is conceivable that the DLC film delaminated from the contact surface of the backing ring due to the locally increased contact pressure between them, even though the grooved backing ring relaxed the contact pressure. We, therefore, conclude that the combined effect of the above approaches is not very apparent. To improve the combined effect of “the grooving” and “the conventional continuous DLC coating,” preventing the decohesion of the DLC film is a challenge. Additionally, we recommend that a continuous structured film be selected as hard film coating the grooved backing ring, which has higher bonding strength than DLC film and a lower friction coefficient.
NSTL
Elsevier
