Couplings

Question 1

What are the three basic types of couplings?

Answer 1

Rigid, flexible, special purpose couplings

Question 2

Rigid couplings

Answer 2

Sleeve, compression, ribbed, flange face, threaded

Question 3

Sleeve coupling?

Answer 3

Used in low speed and low torque applications

Question 4

Compression coupling?

Answer 4

Grip to the shaft using tapered sleeves in tapered hub, don’t require a key or splines on the shaft or hub for grip. Light to modrate loads

Question 5

Ribbed coupling?

Answer 5

Heavy load and heavy torque, machined keyways in both shafts.

Question 6

Flange-face couplings?

Answer 6

Connect shafts with equal to different faces.

Question 7

Threaded coupling

Answer 7

Commonly used on vertical pumps where the drive MIT is connected to the pump by a series of drive shafts joined by threaded couplings

Question 8

Flexible couplings?

Answer 8

Most common, can take misalignment.

Question 9

Classified in three ways

Answer 9

Mechanical flexibility, material flexibility, combination of the two

Question 10

Types of mechanical flexible couplings

Answer 10

Roller chain, silent chain, synthesis chains, gear

Question 11

What are the three types of chain couplings?

Answer 11

Roller chains , silent chain, synthetic chain

Question 12

Roller chain couplings -

Answer 12

Have two sprockets keyed to the shaft connected with a length of standard pitch roller chain. Made of High - tensile Heat treated steel, and the teeth of the sprocket are hardened for Max wear.

Question 13

Silent chain couplings

Answer 13

Recommend for heavy - duty drives at speeds up to 5000 rpms.

Question 14

Synthetic chain drives.

Answer 14

Quietly and smoothly and are often used for light power transmission drives. Made from plastic or nylon and are used in food processing plants and other industries

Question 15

Gear couplings.

Answer 15

Consists of two identical hubs with external gear teeth and a cover or sleeve with machined internal gear teeth

Question 16

Most common types of material flexible couplings.

Answer 16

Rubber tire couplings, elastomeric coupling, pin and biscuit coupling, flexible metal disc coupling.

Question 17

Rubber tire couplings.

Answer 17

Flexible rubber element folded into a shape like a tire.

Question 18

What is a major advantage of the rubber tire?

Answer 18

Driving element can be changed without removing the hubs from the equipment

Question 19

Elastomeric couplings?

Answer 19

Transfer torque through an elastomeric element

Question 20

What is a major advantage of the elastomeric couplings

Answer 20

That the flexible element can be replaced without disturbing the hubs or machine, therefore the shaft alignment is not affected

Question 21

What are universal joints used for?

Answer 21

Used to connect shafts intersecting at angles Greater than can be accommodated by flexible couplings

Question 22

Single universal joints

Answer 22

Simplest joint, can only be at an angle

Question 23

Double universal joint

Answer 23

Used where there is deliberate angular or parallel offset misalignment between the driver and driven machine

Question 24

Constant velocity joints

Answer 24

Used where the joint angles are unequal or when a single cv joint is used.

Question 25

Fluid coupling

Answer 25

Consists of two operating members, the impeller, sometime referred to as a pump, and the turbine which is also called the runner.

Question 26

Torque converter unit is

Answer 26

Usual bolted directly onto internal combustion engine fly wheels

Question 27

Torque converter is a drive

Answer 27

That transmit power solely by fluid forces within a closed recirculation