TATA Motors LP 613 EURO-II, Руководство оператора

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59
Clutch Booster
Hydraulic clutch actuation system
with pneumatically operated clutch
booster has been provided to
reduce clutch pedal effort.In this
system, clutch booster replaces the
function of clutch slave cylinder.
Compressed air connection to
operate clutch booster has been
tapped from port No. 24 of system
protection valve.
Output rod of clutch booster is
connected to clutch release fork.
When there is no force on clutch
pedal, push rod (5), pistons (3 & 4)
are in stand still position due to the
force exerted by return springs (6 &
8).
When pedal is pressed to disengage
clutch, clutch fluid under pressure
enters throught port no. 4 and acts
on piston (3). due to this piston (3)
moves leftwards.
At the same time fluid under
pressure acts on controlling piston
(2) due to which piston (2) moves
leftwards to close air outlet and to
open air inlet (1) compressed air
Port 1. Inlet port (for
compressed air)
Port 3. Vent (for
compressed air) Port 4.
Control port (for clutch
fluid)
2. Piston
3. Piston
4. Piston
5. Push rod
6. Return spring
7. Wind pipe
8. Return spring
A.
B. Cavity
C.
D. Cavity
flows into air cylinder via wind pipe
(7).
Piston (4) moves leftwards and
exert force on piston (3) which in
turn pushes output rod to actuate
push rod (5). The force on piston (4
& 3) is proportional to the pressure
exerted by clutch fluid on piston (2).
When pedal is released to engage
clutch, clutch fluid pressure drops
to zero. By the action of return
spring (8) and air pressure at cavity
B, piston (2) moves rightwards to
close air inlet and to open air
outlet. Compressed air in cavity D
is exhausted to atmosphere. Return
springs (6 & 8) bring back pistons
(2 & 4) to stand still position and
hence push rod (5) retracts to its
original position.
Technical Data
Operating pressure : Clutch fluid 4
Mpa, compressed air 0.8 Mpa
Max. pressure : Clutch fluid 12 Mpa,
compressed air 1 Mpa
Operating Temp. range -40
O
C to
+80
O
C.
1
A
8
B
3
C
2
7
10
5
3
4
6
4
D
2.8 Clutch booster Know Your Vehicle