Mechanics Week 7 (Bearings) Flashcards
What are the 2 types of bearing lubrication?
Grease and Oil
What is grease good for?
Lower Speed and Low Temperature
Easier to use/keep in bearing and housing
Why would we use oil
Higher Speed and High Temperature
What are the 2 types of oils for lubrication?
Petroleum and Synthetic
What oil is used for severe applications?
Synthetic.
What would we use for lubrication in low speed, high temperature situations?
Dry Lubricants
What can excessive oil viscosity cause?
Skidding, Insufficient Friction, Overheating, and Raceway Damage
What can insufficient viscosity cause?
Metal to metal contact and bearing seizure.
What do Linear Bearings provide?
Linear Motion (Up/Down, Side/Side, etc)
How are Linear Bearing typically comprised?
Fixed support component called a rail, way, or guide.
What is the purpose of bearing seals?
Keep contamination out, and lubricant in.
What are the two main types of bearing seals?
Contact and Non Contact
Which bearing seals type is best for high speed applications?
Non Contact (Such as Labrynth Ring)
Which bearing seals spins with the shaft?
Contact.
What are the benefits of mounted bearings?
Shaft support and reduction of friction.
What are the types of bearing mounts?
Pillow block (split and solid), flanged cartridges, cylindrical cartridges, and take up units.
Where are split housing pillow block units useful?
Where it is necessary to dismantle the equipment for bearing replacement on a regular basis.
How are flanged cartridge blocks mounted?
On vertical surfaces where the shaft passes through at a right angle.
What is the benefit of a piloted flanged cartridge type mount?
Increased mounting accuracy leading to less play.
What are take-up units used for?
Adjust the center distance between shafts or where belt tightening is required.
What are the 2 locking bearing types.
Set screw collar and eccentric/cam locking collar.
What do spherical and rod end bearings accommodate?
Wide range of misalignment.
