[雙語翻譯]齒輪設(shè)計(jì)外文翻譯--小齒輪的故障分析（英文）

1、Failure analysis of a pinionC.R. Das, S.K. Albert, A.K. Bhaduri *, S.K. RayMaterials Technology Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, IndiaReceived 29 March 2004; accepted 30 March 2004 Av

2、ailable online 2 September 2004AbstractA pinion, which was a part of an air-motor driving a diesel generator (DG) of a power plant?s emergency power- supply system, was found to have failed into three parts during a rout

3、ine check-up of the DG. This pinion, attached to the air-motor shaft is active only for a short duration during the start up, when the motion of the air-motor shaft is transferred to the ring gear attached to the DG whic

4、h in turn starts the DG. Once the DG has started, the pinion disengages from the ring gear and the air-motor stops. The pinion that failed had been in operation for a long time and experienced several start-up operations

5、 before failure. A systematic failure analysis was carried out to find out the reasons for this unexpected fracture of the pinion during operation. The results indicate that the fracture was caused by fatigue with a fati

6、gue crack initiating from the fillet of one of the pinion teeth. Due to misalignment that was present, the pinion did not mesh properly with the ring gear during the start-up operation and this led to a high stress conce

7、n- tration at the root of the pinion. The misalignment also led to severe wear and excessive heat generation at the mating surface. Misalignment, improper heat treatment, non-uniform distribution of sulphide inclusions a

8、nd sharp corners would have all contributed to the failure of the pinion. ? 2004 Elsevier Ltd. All rights reserved.Keywords: Gear failures; Misalignment; Inclusions; Fatigue crack; Heat treatment1. IntroductionContinuous

9、 operation of power plants necessitates the use of diesel generators (DGs) for providing emergency power supply during unexpected power failures. One of the common methods used for the start-up of these DGs is to use an

10、air-motor that is driven by air released from an air compressor in the event of a power failure. A pinion attached to the shaft of an air-motor drives a large ring gear connected1350-6307/$ - see front matter ? 2004 Else

11、vier Ltd. All rights reserved. doi:10.1016/j.engfailanal.2004.03.010* Corresponding author. Tel.: +91 4114 280232; fax: +91 4114 280081. E-mail address: bhaduri@igcar.ernet.in (A.K. Bhaduri).Engineering Failure Analysis

12、12 (2005) 287–298www.elsevier.com/locate/engfailanal2. Investigations2.1. Visual examinationVisual examination of the fracture surfaces of the failed pinion, after ultrasonic cleaning with acetone, showed the presence of

13、 burn marks on the edge of a spur tooth (Fig. 4) and on the upper land of a helical tooth (Fig. 5). It was further observed that the front of the spur tooth had a smooth worn-out surface, whileFig. 4. Burn mark in one ed