UNIT 6 KEYS AND COUPLINGS Keys and Couplings

d = Diameter of shaft, l = Length of key, w = Width of key, t = Thickness of key, and and c = Shear and crushing stresses for the material of key. A little consideration will show that due to the power transmitted by the shaft, the key may fail due to shearing or crushing.

Design of Key for shaft in Machine Design ExtruDesign

Aug 12, 2018 Where. T = Torque transmitted by the shaft,. F = Tangential force acting at the circumference of the shaft,. d = Diameter of the shaft,. w = Width of the key,. h= Height of the key,. l = Length of the key.. τ = Shear Stress for the material of the Key. σ c = Crushing stresses for the material of the key. So the total torque transmitted by the shaft (T) = F × d/2 (Eqn 1)

keys in shafts- crushing Mining

Keys And Pins : Read Books Online for Free. Sc = Safe crushing ober stress (lbs. per bo. in.). crushing being exerted by the side of the key in both shaft and hub, over the area against the key. »More detailed

Transmitting torque with keyed shafts Linear Motion Tips

Nov 13, 2015 w = key width (m) l = keyway effective length (m) F = 390 x 10 6 * 0.006 * .032. F = 74,880 N. T = 74,880 * .009. T = 673.9 Nm. Crushing Failure. The second possible mode of failure, also caused by forces exerted on the key by the shaft and hub, is based on compressive forces, which can induce permanent deformation and crush the key.

Keys SlideShare

Feb 25, 2013 Example 13.3: A 15 kW, 960 r.p.m. motor has a mild steel shaft of 40 mm diameter and the extension being 75 mm. The permissible shear and crushing stresses for the mild steel key are 56 MPa and 112 MPa. Design the keyway in the motor shaft extension. Check the shear strength of the key against the normal strength of the shaft.

Shaft Keys McMaster-Carr

Woodruff keys work well near shaft shoulders and on tapered shafts. These keys have a rounded shape that makes them easy to remove when parts need to be taken apart frequently. Use them in light duty applications to connect gears and other components to shafts. Also known as half moon keys.

Design of Square Key and Keyway (Wood Ruff) Stress, Shear

Tight Fit Key / Key slot K s = K a K d / K f. Slide Fit Key / Key slot K s = K a K d / K w. Where: τ = Shear Stress S s = Yield Stress of Key T = Torque F = Force D = Shaft Diameter W = Width L = Length K s = Service Factor K a = Application Factor K d = Keyway application Factor K f = Fatigue Life Factor K w = Wear Life Factor F s = Design

Everything You Need to Know About Keyed Shafts Francis

Dec 04, 2018 The flat saddle key is a taper key that fits into a keyway in the hub and is flat on the shaft. It is most times utilised for light loads. The hollow saddle key is a taper key that fits in a keyway in the hub. The bottom of the key is shaped to fit the curved surface of the shaft. 3. Tangent: These keys are used in large, heavy-duty shafts.

What is a keyway on a shaft? Quora

Keys and keyways prevent the shaft fron rotating on the bore and can assist in torque transmission between the two connected shafts. Key, Keyway, and Keyseat A key is a piece of metal used to connect a rotating machine element to the shaft. A key

Keys and Coupling Engineers Gallery

Oct 10, 2015 Keys are used as temporary fastenings and are subjected to considerable crushing and shearing stresses. A key way is a slot or recess in a shaft and hub of the pulley to accommodate a key. Types of Keys: The following types of keys are important from the subject point of view : 1. Sunk keys,2. Saddle keys,3. Tangent keys, 4. Round keys

What are the different types of Keys in machine design

Aug 10, 2018 The key will have a provision in both the shaft and the machine element which needed to be connected. this is called Keyway. These keys are temporary fastening elements and are subject to the crushing and the shearing stress. There are different types of the keys available. Different types of Keys in Machine Design

stresses may be taken as 40 MPa and 80 MPa respectively

The key is designed with usual proportions and then checked for shearing and crushing stresses. The material of key is usually the same as that of shaft. The length of key is taken equal to the length of hub. 3. Design for flange The flange at the junction of the hub is under shear while transmitting the torque. Therefore, the torque transmitted,

Sorting out shaft connections Machine Design

Nov 09, 2006 Crushing failure of flat keys. Shaft and hub keyways can compress and permanently deform the key. Compressive (or crushing) stress equals the applied force divided by the contact area.

Design of Shaft, Keys, Couplings and Gears

The -various members are mounted on the shaft by means of keys or splines. The shafts are usually cylindrical, but may be square or cross-shaped in section. They are solid in cross-section but sometimes hollow shafts are also used. 2. Axle An axle though similar in shape to the shaft, is a stationary machine element and is used

Design of Shafts and Couplings BrainKart

KEYS: A key is a piece of mild steel inserted between the shaft and hub or boss of the pulley to connect these together in order to prevent relative motion between them. It is always inserted parallel to the axis of the shaft. Keys are used as temporary fastenings and are subjected to considerable crushing and shearing stresses.

Keys, Shafts and Couplings Machines Industries

In order to find the length of the key to transmit full power of the shaft, the shearing strength of the key is equal to the torsional shear strength of the shaft. We know that the shearing strength of key, EXAMPLE Design the rectangular key for a shaft of 50 mm diameter. The shearing and crushing stresses for the key material are 42 MPa and 70

Types Of Mechanical Keys- Design Of Keys,Keyways

A saddle key, shown in figure- is very similar to a flat key except that the bottom side is concave to fit the shaft surface. These keys also have friction grip and therefore cannot be used for heavy loads. A simple pin can be used as a key to transmit large torques. Crushing failure of key: 6) shearing failure of key 7) The material of key

Machine Design: LESSON 15 DESIGN OF KEYS

15.2.1 Sunk Keys. A sunk key is a key in which half of the thickness of key fits into the keyway in the shaft and half in the keyway of the hub. The sunk keys are of the following types: Rectangular sunk key: It is the simplest type of key and has a rectangular cross-section. A taper of about 1 in 100 is provided on its top side.

Design of Square Key and Keyway (Wood Ruff) Stress, Shear

Tight Fit Key / Key slot K s = K a K d / K f. Slide Fit Key / Key slot K s = K a K d / K w. Where: τ = Shear Stress S s = Yield Stress of Key T = Torque F = Force D = Shaft Diameter W = Width L = Length K s = Service Factor K a = Application Factor K d = Keyway application Factor K f = Fatigue Life Factor K w = Wear Life Factor F s = Design

Design of shafts and couplings

1] Sunk Keys :- The sunk keys are provided half in the keyways of the shaft and half in the keyway of the hub or boss of the rotating element. The different types of sunk keys are as follows :-. I] Rectangular Key:-. The rectangular key has a rectangular cross section. Widht of key, W= d 4, Height of key, h= d 6.

Shafts & Keys Multiple Choice Questions and Answers Set

Shafts & Keys Multiple Choice Questions and Answers Set 02 Two shafts A and B are made of same material. The diameter of shaft A is twice that of B. Crushing resistance (D) None of the above. Correct Answer. 8. The angle of twist for a transmission shaft is inversely proportional to (A) Shaft diameter (B

Keys and Couplings.pptx Keys and Couplings Chapter#3

Design the rectangular key for shaft of 75 mm diameter. The shearing and crushing stresses of key material are 50 MPa and 75 MPa respectively. 2. Design a square key for fixing a gear on the shaft having 25 mm diameter. The gear rotates at 550

Keys And Pins ChestofBooks

Straight keys have working bearing only at the sides, driving purely by shear, crushing being exerted by the side of the key in both shaft and hub, over the area against the key. The key itself does not prevent end motion along the shaft; and if end motion is not desired, auxiliary means of some sort must be resorted to, as, for example, set

What are the different types of Keys in machine design

Aug 10, 2018 The key will have a provision in both the shaft and the machine element which needed to be connected. this is called Keyway. These keys are temporary fastening elements and are subject to the crushing and the shearing stress. There are different types of the keys available. Different types of Keys in Machine Design

stresses may be taken as 40 MPa and 80 MPa respectively

The key is designed with usual proportions and then checked for shearing and crushing stresses. The material of key is usually the same as that of shaft. The length of key is taken equal to the length of hub. 3. Design for flange The flange at the junction of the hub is under shear while transmitting the torque. Therefore, the torque transmitted,

Unit5 Design of Keys Strength Of Materials Mechanical

The shearing and crushing stresses for the key material are 42MPa and 70 MPa. Given data: d = 50mm; τ = 42MPa = 42N/mm2; σc = 70MPa = 70 N/mm2 From the table we find that for a shaft of 50mm diameter Width of the key w = 16mm; thickness of key t = 10mm The length of the key is obtained by considering the key in shearing and crushing.

Design of Shaft, Keys, Couplings and Gears

The -various members are mounted on the shaft by means of keys or splines. The shafts are usually cylindrical, but may be square or cross-shaped in section. They are solid in cross-section but sometimes hollow shafts are also used. 2. Axle An axle though similar in shape to the shaft, is a stationary machine element and is used

Types Of Mechanical Keys- Design Of Keys,Keyways

A saddle key, shown in figure- is very similar to a flat key except that the bottom side is concave to fit the shaft surface. These keys also have friction grip and therefore cannot be used for heavy loads. A simple pin can be used as a key to transmit large torques. Crushing failure of key: 6) shearing failure of key 7) The material of key

Machine Design: LESSON 15 DESIGN OF KEYS

15.2.1 Sunk Keys. A sunk key is a key in which half of the thickness of key fits into the keyway in the shaft and half in the keyway of the hub. The sunk keys are of the following types: Rectangular sunk key: It is the simplest type of key and has a rectangular cross-section. A taper of about 1 in 100 is provided on its top side.

Calculator for designing shaft keys

Key dimensions: Parallel keys are most commonly used. The key and key seat cross section are ISO standardized. The key length should be less than about 1.5 times the shaft diameter to ensure a good load distribution over the entire key length when the shaft becomes twisted when loaded in torsion.

Design of shafts and couplings

1] Sunk Keys :- The sunk keys are provided half in the keyways of the shaft and half in the keyway of the hub or boss of the rotating element. The different types of sunk keys are as follows :-. I] Rectangular Key:-. The rectangular key has a rectangular cross section. Widht of key, W= d 4, Height of key, h= d 6.

Shafts & Keys Multiple Choice Questions and Answers Set

Shafts & Keys Multiple Choice Questions and Answers Set 02 Two shafts A and B are made of same material. The diameter of shaft A is twice that of B. Crushing resistance (D) None of the above. Correct Answer. 8. The angle of twist for a transmission shaft is inversely proportional to (A) Shaft diameter (B

Machine Guarding eTool Motions and Actions

Collars, couplings, cams, clutches, flywheels, shaft ends, spindles, meshing gears, and horizontal or vertical shafting are some examples of common rotating mechanisms which may be hazardous. The danger increases when projections such as set screws, bolts, nicks, abrasions, and projecting keys or set screws are exposed on rotating parts.

Muff Coupling and Muff Coupling Design Coal Handling Plants

Dec 14, 2017 The coupling key is usually made into two parts so that the length of the key in each shaft. Key Length, l = L / 2 = ( 3.5 x shaft dia ) / 2 After fixing the length of key in each shaft, the induced shearing and crushing stresses

Transmission shaft MYcsvtu Notes Home

page no. 5.16 and select width and height of the key for given shaft diameter (d). • Length of the coupling key = 3.5 d length of the key in each shaft l = L/2 = 3.5d/2 After fixing dimensions induced shearing and crushing stress may be checked by following equations:- (considering shear of key) (considering crushing of key) 2M t dbl W 4 t c

KEYS AND KEYWAYS Union College

TAPERED KEYS Designed to be inserted from the end of the shaft after the hub is in position. The taper will impart a compressive contact pressure between the hub and the shaft. Friction will help transmit torque and provide resistance to axial motion of the hub relative to the shaft. Tapered keys do not require set screws.

keys in shafts crushing quarry operations in the philippines

Crushing Plant Design and Layout Considerations 911 Metallurgist. In mining operations, the layout of crushing plants and ancillary equipment and structures is a .. The life of the mine is a key element in the design of any crushing plant. . Supports must be provided for gyratory and conveyor main shafts and Quarry. Hinton,AB. 54 x 74 AC. 1.