PSI - Issue 18

Goran Vukelic et al. / Procedia Structural Integrity 18 (2019) 406–412 Author name / Structural Integrity Procedia 00 (2019) 000–000

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The pinion shaft was a part of the first stage of the crane gearbox., with the engine power of 20 kW at 1200 rpm. Total weight of the pinion shaft is 7.06 kg. Fig. 2 presents a close-up of the gear with damaged teeth. A damage pattern can easily be detected with teeth gradually being brought to excessive contact and damage evolving over the gear. Little or no corrosion occurred on the gear shaft.

Fig. 2. Fractured spiral bevel gear. Dashed line shows the evolution of damage contact.

Fig. 3 presents the teeth damage at the characteristic positions along each tooth, the start of excessive contact, middle point of damage area and final point of damage area. Figures are taken at suitable magnification using Olympus SZX10 stereo optical microscope.

a)

b)

c)

Fig. 3. Fractured spiral bevel gear with marked locations of performed optical micrographyat 12.5x magnification: a) location 1a showing initiation section of damage area, b) location 1b showing middle section of damage area, c) location 1c showing end section of damage area.