Mechanics Week 6 (Roller Bearings) Flashcards
What is the type of contact roller bearings have between races?
Line Contact
What are the four types of roller bearings?
Cylindrical, Needle, Spherical, and Tapered
What are some pros to cylindrical bearings ?
Highest radial load and speed capacity
What are some speed limiters on cylindrical bearings ?
Roller length-to-diameter ratio, grade of precision, roller guidance, type of cage, type of lubrication, shaft installation, housing accuracy, and heat dissipation
What is a “fixed bearing” ?
A bearing mounted in a fixed or secured pivot point at one end of the shaft
What is a “floating bearing” ?
The opposite end of the shaft from the mounted bearing. It allows axial forces to pass through. Allows thermal expansion.
T/F
Roller bearings are more sensitive to misalignment compared to ball bearings
True
What is the ratio for needle bearings?
6:1
Roller length is 6 times the diameter
What are the two types of needle bearings ?
Cage separated, and full complement style
What type of needle bearing accommodates higher speeds and precision rolling ?
Cage separated
What is another name for full complement needle bearings ?
Drawn cup needle bearings
What is the inner race of cage sepearated needle bearings ?
The shaft
What is the inner race of full complement style needle bearings?
The shaft
What is a common issue with full complement needle bearings ?
The rollers all falling out due to no separators
What is a reason needle bearings are selected compared to other roller bearings?
Heavy radial load in minimal space
What roller bearing is the baseline for all of the other types ?
Cylindrical roller bearings (like the Conrad)
T/F
Cam-type bearings can accommodate either symmetrical or elliptical motion
True
Spherical roller bearings are good for what ?
Misalignment between 0.5 deg. to 2 deg.
High radial load and thrust load
What is the ratio for spherical roller bearings ?
4lbs. of radial load for every 1lb. of thrust load
What are the two components of tapered roller bearings?
Inner ring or CONE, an outer ring or CUP
T/F
Tapered roller bearings have shallow angles to accommodate for thrust loads?
False
T/F
On tapered roller bearings steep angles accommodate for radial loads.
False
