Pinion bearing arrangement

A gearbox for a vehicle or aircraft, comprising:

• a pinion comprising a shaft and a bevel gear,
• a pinion bearing arrangement comprising a first roller bearing and a second roller bearing located on the shaft, the first roller bearing comprises a first outer raceway, a first inner raceway, and a first set of rolling elements therebetween and the second roller bearing comprises a second outer raceway, a second inner raceway, and a second set of rolling elements therebetween, wherein at least one of the first roller bearing and the second roller bearing is a ball bearing and wherein at least one of the first inner raceway, the first outer raceway, the second inner raceway, and the second outer raceway is made from a ball bearing steel produced by a powder metallurgical process using a powder metallurgy component including
• 0.5 (zero point five) to 2.0 (two point zero) weight-% C,
• a maximum of 0.035 (zero point zero three five) weight-% S,
• 3.0 (three point zero) to 5.0 (five point zero) weight-% Cr,
• 1.0 (one point zero) to 4.0 (four point zero) weight-% V,
• 1.0 (one point zero) to 12.0 (twelve point zero) weight-% W and
• 2.0 (two point zero) to 12.0 (twelve point zero) weight-% Mo,
• wherein both the first outer raceway and the first inner raceway have a first radius (rI/O) and the first set of rolling elements have a first diameter (DB) which fulfill the equation:
• 0.545 (zero point five four five)>rI/O/DB>0.54 (zero point five four)
• wherein both the second outer raceway and the second inner raceway have a second radius (r2I/2O) and the second set of rolling elements have a second diameter (D2B) which fulfill the equation:
• 0.535 (zero point five three five)>r2I/2O/D2B>0.53 (zero point five three),
• and wherein the first roller bearing is located closer to the bevel gear than the second roller bearing.