about bearings, about bearing history, fields for improvement in bearing

1. Bearing
By
rkk

2. History :
• Huge blocks of stone are being transported by sliding them on tree
trunks acting as bearing.
Leonardo de Vinci's sketch

3. Bearing:
• Machine element that constrains relative motion
to a desire motion.
• Linear movement
• Rotation
• Machine element that allows one part
to bear(i.e. to support) another.

4. • Leonardo Da Vinci gave drawing of ball bearing in around year 1500.
• The cagedball bearing was described by Galileo in 17th century.
• Then in 18th century:
modern recorded patents for ball bearing , roller bearing,
taperedroller bearing
• In 19th century :
• Improvement in linearbearing and also in rotational bearing.

5. Improvements:
• Speed
• load
• Friction and power loss
• Life
• Space requirement
• Lubrication
Applications:
• Household appliances
• Gas turbines
• Electric motors
etc.