Clutches & Brakes.pptx

8/16/2019 Clutches & Brakes.pptx

1/17

4TH YEAR MECHANICAL ENGINEERING ENGLISH PROJE

CLUTCHES & BRAKES

REALIZED BY: YEAR:2015/2016

- CHAHBAN ILIAS


2/17

1. INTRODUCTION

T! "#$%'(")* +,(*$ +"' "' $"-!(!#' .!*$ #!!$ $"-!(!#' !)#")!#"#! !* +" )(! %*"!$ 3 !#!( ,%(! !*!'(")* !#"#!I# ,($!( ', '()#"' ')' !#!( 8(, '! !#"#! ', '! )"#! +,(9"#)(' +! %! !)#")* '()#"",#7

T! *)''!( )(! !(8,(!$ %%)** +"' !!$ )#$ !-,(' )#!7

K! ', !-!'";! ,#'(,* )#$ '()#"",# ,8 $(";! ',(


3/17

2. DEFINITION AND DIFFERENT TYPES OF

CLUTCHES

Clutches : !(;! ', ,##!' )#$ $",##!' '+, ,**"#!))8' ,8 ) !)( +!# '! ;!"*! " ')'",#)( )#$ '!!#"#! " (%##"#7

S""*)( ', ,%*"#7

>("'",# )#$ !#! !)' $"")'",#7


4/17


5/17

DISC CLUTCHES

o This type of clutch consists of two flanges, one flange is rigidly to the driving shaft and other flan

to the driven shaft feather key or splines.

o Disc clutches can consist of single or multiple discs, in simplest form there is a clutch with a sing

witch is used in automobiles, figure1.

o In more complex designs there is the multiple disc clutch which is used when a large torque trans

required, figure.

• Figure 1. Disc clutch Figure 2. Multiplclutch


6/17

CONE CLUTCH

o

! cone clutch "igure.# as shown below consists of two cones, one internal cone fthe driven shaft and another cone fitted on the driven shaft.

o The operating lever used only for disengagement of the clutch.

o The main advantage of cone clutch over the disc clutch is very simple and requireaxial pressure to disengaged the clutch.

• Figure 3. Clon


7/17

3. DEFINITION AND DIFFERENT TYPES OF

BRAKES

Brakes: !(;! ', )$?%' ,( ', ', '! (,')'",# ,8 ) )8'7

B()9"# )'",# " (,$%!$ 3 8("'",# ) ) ')'",#)( )(',# ) ,;"# )('7

H!)' $"")'",# )*,(". !#!( $%! '! 8("'",# " ) (, B()9! 8)$! $%("# ,#'"#%,% )*")'",# ,8 3()9"# $%!

!#!()'!$7


8/17

TYPES OF BRAKES

B()9!

M!)#")*

B*,9 3()9!

B)#$ 3()9!

I#'!(#)* ,(

!@'!(#)*!@)#$"# ,!

3()9!

E*!'(")*

H$()%*"


9/17

SINGLE BLOCK OR SHOE BRAKE

$$It consists of a block or shoe as shown in figure .%, which is pressed against the rim of a re

brake wheel drum.$$ The block is made of a softer material than the rim of the wheel. The friction between the bthe wheel causes a tangential braking force to act on the wheel, which retard to rotation of th

$$ The block is pressed against the wheel by a force applied to one end of a lever to which thrigidly fixed.

•

Figure 4. Single block brak


10/17

SIMPLE BAND BRAKE

o ! band brake consist of a flexible band of leather, one or more ropes, or a steel line

friction material, which embraces a part of the circumference of the drum. ! band bshown in fig.& is called a simple band brake.

o This type of brake is used in civil construction equipment and also in automobiles a

brake.

• Figure 5. Simple band b


11/17

INTERNAL EPANDING BRAKE

o! internal expanding brake as shown in "ig.' consist of two shoes.

oThe outer surface of the shoe are lined with some friction material to increases the co

friction and to prevent wearing away of the metal.

o(ach shoe is pivoted at one end about a fixed fulcrum and other end rests against cam

o)hen the cam rotates, the shoes are pushed outwards against the rim of the drum. Th

between shoe and the drum produce the braking torque and hence reduces the speed

oThis type of brake is commonly used in motor cars and light trucks.

Figure 6. internal epanding


12/17

4. DIFFERENT COMMAND SYSTEMS OF CLUTCHE

AND BRAKES IN CASE OF CLUTCHES

T! ,)#$ )# 3!:

B )3*! ,*$ )#$ )** '+,=+!!*!( "(%"' ,8 3()9"# ,8 '! ,*$)%',,3"*! )#$ '! )#$3()9! ,8 !(')"# %((!#' )%',,3"*! B )"'!$ $()%*" '! ')' " (!%(""# ) *"


13/17

5. MATERIAL OF FRICTION SURFACES

T! )'!(")* %!$ 8,( *"#"# ,8 8("'",# %(8)! ,8 *%'! )#$ 3()9!,%*$ );! '! 8,**,+"# )()'!("'":

17 I' ,%*$ );! ) " )#$ %#"8,( ,!"!#' ,8 8("'",# 3!'+!!# 0

06 )#$ ', 9!! "' "#$!!#$!#'* ,8 '! !!$ ,8 '! (!%(! )#'!!()'%(!7

27 I' ,%*$ #,' 3! )-!'!$ 3 ,"'%(! )#$ ,"*7

7 I' ,%*$ );! '! )3"*"' ', +"'')#$ ",(')#' !-,(' )#$ "'!!()'%(! ,8 '! ,($!( ,8 600 ', F00 C )%!$ 3 *")!7

47 I' ,%*$ );! " !)' ,#$%'";"'7

57 I' ,%*$ );! " (!"')#! ', +!)( )#$ ,("# +"',%' )-!'"#8("'",# %(8)!7

67 I' ,%*$ #,' (,$%! #,"! ,( )''!("#7

F7 I' ,%*$ );! '! )3"*"' ', (!,;!( '! ,!"!#' ,8 8("'",# )8'!()#,()! +!''"#7


14/17

6. ADVANTAGES AND DISADVANTAGES OF

COMBINING SYSTEM

ADVANTAGES

• C*%'! )#$ B()9! !#!()** );! % *,+!( "#!('") ')# '! ("! ) '")* "'%)'",# '% '! )# 3! %!$ ', (,$%! % "!( ()'! '$!"#!( ,%*$ ,3')"# 3 !(!* '%(#"# '! ("! ,;!( ,# )#$ ,-7

• A#,'!( )$;)#')! ,8 '! ,3"#!$ '! " ')' )!*!()'",# )#$$!!*!()'",# )# ,8'!# 3! (,()!$ ,( *""'!$ "# ,! *%'=3()9! D)!( )(! ,8'!# (!


15/17

7. LUBRIFICATION

Ma! "#$%&'( &) *+,-a$&!/

o S*) *%3(")'",#

o G(!)! *%3(")'",#

o L%3(")'",# 3 ,"* "(%*)'",#

o O"* "' *%3(")'",#

o D(" *%3(")'",#

!ubricating the a hub


16/17

0. CONCLUSION!hat are the "est Clutches#Brakes t$ ch$$se %$r $ur cares&

o C*%'! )#$ 3()9! )(! 9! !*!!#' ,8 '! '()#"",#7 A %%)*!;!('"# " ) )''!( ,8 ,(,"!: .#$ '! ("' ("! / ("'",# S%(8)! )(' '! 3!' )'!(")* ', ,,! " ),()#" )'!(")* ! ,-!( ) (!)' ,3"#)'",# ,8 " ')'" 8("'",#$#)" 8("'",# )#$ ,,$ 8)$! '!7

#able2. Most used materials inClutches$%rakes s&stems


17/17

T)#9 ,% 8,( ,%( )''!#'",

Clutches & Brakes.pptx

Documents

Transcript of Clutches & Brakes.pptx