Lubrication Flashcards
three types of friction
rolling, fluid, sliding
three factors that affect velocity
Temperature, speed, pressure
4 of the types of oiling methods (planer)
drip, wick, chain, bottle
what are the two units that velocity is measured in?
Centistoke (40 degrees Celsius), Saybolt Universal Second (100 degrees farenheight)
Types of lubricant films
Full film, Elasto-hydrodynamic film, Boundary film
T or F: The tighter the tolerance the more support the film gives
True, think of larger area equals less film on the sides due to the larger area
As temperature increases the viscosity……?
decreases
As pressure of the oil increases the viscosity…..?
decreases
What is affected by viscosity?
Load capability, rate of flow, fluid friction, heat, power consumption, sealing properties
What is viscosity index?
The change of viscosity in the coldest and hottest temperatures it is rated for
What is pour point?
the lowest temperature oil can be observed to flow
What is viscosity?
the measurement of liquid flow
What are the types of oils?
Petroleum based oils, synthetic oils
What are some additives added into oils?
Oxidation inhibitors, Rust/corrosion inhibitors, foam depressants, Anti wear additives, Extreme pressure additives
What oil system uses cavitation
the wick oil cups
what creates a slow moving fluid?
A strong attraction in the molecules within the fluid
What must happen to the fluid to obtain a full film?
The shaft must reach a certain minimum speed, the depends on the load rating and minimum speed rating of the viscosity of the lubricant
What are the functions of a lubricant?
1) help reduce friction by separating moving surfaces between a film, 2)protect against corrosion 3) Carry away heat, 4) carry away contaminants 5) help seal
