Bearing Technologies

Question 1

a machine element which supports another moving machine element (known as journal)

Answer 1

Bearing

Question 2

It permits a relative motion between the contact surfaces of the members, while carrying the load.

Answer 2

Bearing

Question 3

due to the relative motion between the contact surfaces

Answer 3

certain amount of power is wasted in overcoming frictional resistance

Question 4

if the rubbing surfaces are in direct contact

Answer 4

, they will be rapid wear

Question 5

. In order to reduce frictional resistance and wear and in some cases to carry away the heat generated, a layer of fluid (known as …) mat be provided

Answer 5

lubricant

Question 6

used to separate the journal and bearing is usually a mineral oil refined from petroleum, but vegetable oils, silicone oils, greases

Answer 6

lubricant

Question 7

A bearing is a machine element which supports another moving machine element (known as journal). It permits a relative motion between the contact surfaces of the members, while carrying the load. A little consideration will show that due to the relative motion between the contact surfaces, a certain amount of power is wasted in overcoming frictional resistance and if the rubbing surfaces are in direct contact, there will be rapid wear. In order to reduce frictional resistance and wear and in some cases to carry away the heat generated, a layer of fluid (known as lubricant) may be provided. The lubricant used to separate the journal and bearing is usually a mineral oil refined from petroleum, but vegetable oils, silicone oils, greases etcetera may be used.

Answer 7

BEARING

Question 8

Another moving machine element supported by the bearing

Answer 8

Journal or Shaft

Question 9

Origins of loads of bearing

Answer 9

-mass of the machine and its components
-mass of the material to be conveyed.
- change in momentum
-transmission of power.

Question 10

-mass of the machine and its components
-mass of the material to be conveyed.
- change in momentum
-transmission of power.

Answer 10

Origins of loads of bearing

Question 11

Classification of Bearing

Answer 11

-Depending on direction of load to be supported.
-Depending on the nature of contact

Question 12

the load acts perpendicular to the direction of motion of the moving element

Answer 12

Radial Bearings

Question 13

the load acts along the axis of rotation

Answer 13

Thrust Bearings

Question 14

the sliding takes place along the surfaces of contact between the moving
element and the fix element. It is also known as plain bearings.

Answer 14

Sliding Contact Bearings

Question 15

the steel balls or rollers are interposed between the moving and fix
elements. the bowls of a rolling friction at two points for each ball or roller.

Answer 15

rolling contact bearings

Question 16

angle of contact of the bearing with the journal is 360°

Answer 16

Full Journal Bearing

Question 17

when the angle of contact of the bearing with the journal is 120 degrees

Answer 17

Partial Journal Bearing

Question 18

when a partial journal bearing has no clearance letter example the
diameter of the journal and bearing are equal

Answer 18

Fitted Journal Bearing