Lube Flashcards
What are the two main types of lubrication for bearings?
Grease and oil
Why is grease often used for bearing lubrication?
Due to convenience and easy application
What are synthetic and dry lubricants suitable for?
Severe applications
What is grease composed of?
Petroleum or synthetic oil, a thickener, and assorted additives
In what types of applications is grease normally applied?
Low- and moderate-speed applications
Why is grease preferred in inaccessible locations?
It is easily contained in a housing
What types of oils can be used as lubricating oil?
Petroleum or synthetic
For what applications is oil often used?
High-speed or high-temperature applications
What is a disadvantage of using oil in bearings?
More difficult to seal and retain in the bearing housing
What is the least expensive type of oil used for lubrication?
Petroleum oils
What is an advantage of synthetic oils over petroleum oils?
Operate over a wider temperature range
What can excessive oil viscosity cause?
Skidding of rolling elements and high lubricant friction
What can insufficient viscosity lead to in bearings?
Metal contact and bearing seizure
In what applications are dry lubricants typically used?
Low-speed, high-temperature applications
How are dry lubricants usually applied?
In a carrier fluid that burns off, leaving the solid lubricant
What do linear bearings provide?
Low friction motion in one dimension
What is the fixed support component in linear bearings called?
Rail, Way, or Guide
What slides on the support of linear bearings?
Block, Shoe, Carriage, or Slide
What are the two types of seals used in bearings?
Contact and Non-Contact
What is the purpose of seals in bearings?
To keep elements out and hold lubricant in
What is a characteristic of contact seals?
Maintain contact with both rotating and stationary components
What is a benefit of non-contact seals?
Eliminates rubbing friction and heat buildup
What do mounted bearings eliminate?
The need to select and assemble components
What do mounted bearings provide when installed in a housing?
Shaft support for radial, thrust, or a combination of loads
