Alb Mod Couplings

Question 1

Shaft couplings are _______ components used to connect the driving and driven shafts end to end

Answer 1

power transmission components

Question 2

Couplings should be capable of transmitting the maximum ___ and ___ for the intended application

Answer 2

torque and power

Question 3

The three types of couplings are: (3)

Answer 3

• Rigid
• Flexible
• Special purpose

Question 4

A ____ coupling does not allow for any deviation in the alignment of the shafts and does not permit end float

Answer 4

rigid

Question 5

This coupling is a very simple rigid coupling. Used at low speeds and low torque, consist of heavy walled tube with a keyway and holes/threads for set screws

Answer 5

sleeve coupling

Question 6

This rigid coupling grips the shaft using tapered sleeves inside of tapered hubs. The hubs are drawn together with bolts, and in doing so, clamps itself to the shaft. Good for light to moderate loads and can accommodate two different shaft sizes.

Answer 6

Compression coupling

Question 7

This rigid coupling is used in heavy load and torque applications. The two halves of the coupling are split parallel to the shafts axis and require keyways machined in both shafts. Made of steel or cast iron, the torque is transmitted via the keys, the clamping of the coupling merely holds it all together. Can be special made for different size bores

Answer 7

ribbed coupling

Question 8

This rigid coupling has two flanged halves that are bored and keyed to fit the shaft. They can be mounted on different diameter shafts. In some cases, the hubs are a machined part of the shaft. The hubs are made with male and female surfaces and close fitted bolts. In light duty applications, can be mounted with an interference fit.

Answer 8

Flange-faced couplings

Question 9

This rigid coupling is commonly used on vertical pumps where the drive is connected via a series of drive shafts. Shafts rotate in the direction of the threading. Lubricant or anti seize is recommended. Steady bearings can eliminate shaft whipping and vibration

Answer 9

Threaded couplings

Question 10

This type of coupling will compensate for some misalignment, either through mechanical or material flexibility. Most common couplings.

Answer 10

Flexible coupling

Question 11

Mechanical flexibility is:

Answer 11

flexibility achieved through designed clearance between coupling parts, allows a sliding motion

Question 12

Material flexibility is:

Answer 12

flexibility achieved through the bending or compressing if a coupling material

Question 13

Mechanically flexible couplings have very little:

Answer 13

torsional flexibility

Question 14

The three types of chain coupling are:

Answer 14

• Roller chain
• Silent chain
• Synthetic chain

Question 15

This flexible chain coupling has two sprockets keyed to the shafts and a length of standard pitch roller chain connecting them. Chain is usually made of high tensile, heat treated steel and the sprockets are hardened for maximum wear. Can use double strand or single strand roller chain. Single strand offers more end float. These couplings are suitable for moderate speed/power

Answer 15

Roller chain coupling

Question 16

This flexible chain coupling is usually recommended for heavy-duty drives at speeds of up to 5000 RPM. Chain is wrapped around two wide sprockets. Allows for minor misalignment and some end play. Is more balanced, smooth and quiet.

Answer 16

Silent chain coupling

Question 17

This flexible chain coupling operates quietly and smoothly and is usually used for light power drives. Chain is made from plastic or nylon. More common in food processing. Links do not require lubrication and are not conductive. Can be used in corrosive conditions of pins are stainless. The chain material allows for some torsional flexibility.

Answer 17

Synthetic chain coupling

Question 18

This flexible coupling consists of two identical hubs with external gear teeth and a cover that has matching internal teeth. Allows for axial float and some angular and offset misalignment. Needs to be lubricated. Steel for high torque loads and plastic for low HP uses. Tooth profiles can be straight tooth or curved tooth

Answer 18

gear coupling

Question 19

With a gear coupling, which allows more misalignment? curved or straight teeth?

Answer 19

curved teeth

Question 20

Material flexible couplings use what materials? (5)

Answer 20

• Rubber
• neoprene
• plastic
• nylon
• flexible metal elements

Question 21

This flexible coupling uses a flexible rubber element. Either clamped together or molded directly to the steel rims. Driving element can be changed without changing the hubs. Can reduce shock and vibration. Excellent torsional flexibility and can allow any type of misalignment and end float.

Answer 21

Rubber tire coupling

Question 22

The rubber tire coupling can be made smaller and more compact, but are more difficult to install and have less torsional flexibility. What is it called?

Answer 22

bonded rubber coupling

Question 23

This flexible coupling transfers torque through an elastometric element, bonded to metal inserts that bolt to the hubs. Insert unwraps and allows easy installation. Insert can be swapped without disturbing alignment

Answer 23

elastometric coupling

Question 24

This flexible coupling uses a rubber or neoprene biscuit molded to steel sleeves. Allows for deflection, torsional flexibility and axial float

Answer 24

pin and biscuit coupling

Question 25

This flexible coupling uses a series of thin steel plates to form a flexible steel disc. Used in either single or double configuration. A single disc can tolerate angular misalignment, but not offset. When two set are used, both angular and offset can be compensated. Allows for some end float. Good for high speeds and high loads. Has unusually high torsional rigidity. Has no backlash.

Answer 25

Flexible metal disc coupling

Question 26

This coupling is both mechanically and materially flexible. Consists of two hubs with slotted flanges and a steel spring grid. Allows for torsional flexibility and minor amounts of misalignment. Lubrication is necessary. Larger sizes have two grids, one smaller on the bottom. Allows for axial motion, dependent on the gap

Answer 26

Steel grid coupling

Question 27

This flexible coupling has two metal hubs with jaw sections that interlock with an insert called a “spider”. the torque is passed through the rubber spider, which acts as a dampener. Good for small to medium HP uses.

Answer 27

Jaw and spider coupling

Question 28

This flexible coupling is a molded rubber coupling mounted between two metal hubs. The hubs have internal gear teeth that match external teeth on the molded rubber sleeve. High torsional flexibility, can tolerate shock, reversing and can dampen vibrations. Allows some misalignment and end play. Requires no lube.

Answer 28

Splined rubber coupling

Question 29

This flexible coupling has high torsional flexibility, dampens vibrations, and tolerates reversing and shock loads. A flexible disc engages with pins in the hubs. The disc has close fitting holes. Can allow axial movement.

Answer 29

Pin and disc connector coupling

Question 30

This flexible coupling consists of a pair of hubs. One hub is fitted with steel studs and rubber bushings, and the other hub is drilled to accommodate the bushings, Allows end float, but not recommended for excessive misalignment. Studs/bushings can be replaced with the unit in place.

Answer 30

Pin and rubber bushing coupling.

Question 31

_____ are used to connect shafts that intersect at angles greater than can be accommodated by flexible couplings

Answer 31

universal joints

Question 32

If alignment is too accurate on a universal joint you will get:

Answer 32

false brinelling and lube problems in the needles of the joint

Question 33

This is the simplest of universal joints. Consists of two yokes connected to the ends of the driver and driven shafts. Classed as a non-constant velocity joint. Cannot allow for axial movement unless connection is splined.

Answer 33

Single universal joint

Question 34

This universal joint has a shaft and universal joints on each end. Used where there is deliberate angular or parallel offset. Can be made telescopic with a spline. If angles are equal at each joint, it does not produce the same speed fluctuations as a single joint

Answer 34

Double universal joint

Question 35

To prevent excessive vibration, it is important that the universal joints are installed:

Answer 35

in phase

Question 36

This joint is used where the joint angles are unequal, or where a single joint is required with constant velocity output. Even and smooth transfer of power with no fluctuations in speed.

Can be made with a spider and trunnions, or an inner/outer race with balls. Both types use a boot for sealing.

Answer 36

Constant velocity (cv) joint