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What is the profile factor in journal bearing design? What is the importance of profile factor?

Both the gear and pinion on solid gears. Both are running at same pitch line velocity. The Ansys results are showing the expansion of gear tooth is more than the pinion tooth. is there any contact between the gear tooth and pinion root area? Thanks

The gear and pinion are running at high speeds and no-load condition. are the pinion and gear tooth will have different expansions in radial direction? I think, as the the gear is larger in size, the growth or expansion of the gear tooth is more than the pinion tooth. if the expansion of the...

I have found some articles where the gear teeth temperature increases across the face width in helical gears. What are the reasons for increase in the temperature across the face width even though same amount of oil supplying? What methods can reduce the non-uniform temperature distribution?

The mineral oil is being supplied at 40 deg C, How to calculate flow rate, if the oil supply temperature is increased to 50 deg c and 60 deg C. As the temperature increases, viscosity of the oil reduces. The specific gravity also reduces with temperature. Q2/Q1 = (SG1/SG2)^(1/2) flow rate of...

The ISO VG 32,46 and 68 oils are being used in gearboxes. The gearboxes here specifying are high speed and high power gearboxes. what is the maximum operating temperature of ISO VG 32 , 46 and 68 oils to have required viscosity to form sufficient film thickness between the meshing gears? if the...

Gears are rotating at higher pitch line velocity ( 100 m/s). How to calculate the gear tooth deformation due to rotational speed and centrifugal stress on gear tooth?

The gearbox with double helical gears are rotating at peripheral velocity of 80 m/s and the oil is supplied to the gears at the outmesh. The lubricantion oil ISO VG mineral oil. How to calculate the optimum gear mesh oil to the meshing area? How much is the bulk tooth temperature is allowable?

The high speeds gears are rotating at a peripheral velocity of 90 m/s, the lubrication type is pressure oil with nozzles pointing at the outmesh of gears. How much power loss will increase from no-load to full load? and how much rise in temperature of gear tooth from no-load to full-load?

How much temperature of gear/pinion tooth will be increased from no-load (2 to 5% of full-load) to full-load in high speed gearbox? oils used are ISO mineral oil. How to calculate the rise in temperature from no-load to full-load? How much gearbox power loss will increase from no-load to...

Dear romke, let's say for 18MW High speed gearbox running at 90 m/s of plv, the oil flow to the gear mesh is "X" litres/minute. How to know, whether I can reduce 10% or 20% or 30% of X flow, so that the tooth the temperature is within the allowable and scuffing risk is low. oil is the mineral...

How to analytically estimate the steady state bulk temperature of gears while the gears are lubricated and cooled under oil jet lubrication?

How to calculate the amount of heat generated in double helical gears. Is that analytical value will be close to experimental heat generation value?

I have measured object temperature by setting emissivity in the infrared thermometer. How to calculate the temperature for the emissivity of 0.83 Emissivity/ "infrared Temperature (deg C)" 0.5 / 68.7 0.7 / 58.5 0.83 / -? 0.96 / 50.7 1 / 49.8

What is the emissivity of 17CrNiMo6/18CrNiMo7 material for the temperature range of 0 deg C to 150 deg C?

@orange_kun optimum tightening torque required for bolt under static and dynamic conditions Bolt size: M30, Material: AISI4340 alloy steel Grade (property class): 12.9 All Bolt threads to be lubricated with MoS2 grease during torque tightening. Temperature variations will not be there. Bolts...

optimum tightening torque required for bolt under static and dynamic conditions Bolt size: M30, Material: AISI4340 alloy steel Grade (property class): 12.9 All Bolt threads to be lubricated with MoS2 grease during torque tightening. Temperature variations will not be there. Bolts are not...

I have not clearly mentioned the question. The objective is to estimate the tightening torque required for stationary components and rotating components. stationary components (ex: gear casing) and rotating components (ex: rotating gear shaft coupled with turbine rotor). How to calculate the...

I would like to know the gear tooth temperature while the gears are running. I could not measure the temperature while gears are rotating. I have measured gear tooth temperature after stopping the gears and cutting the lubricant oil (within 10 minutes ). After stopping gearbox, the oil on gear...

I would like to know the tightening torque required for bolt in a coupling under static and dynamic conditions. How to estimate the tightening torque for these two cases? Kindly suggest