9-22
2) When the clutch is in half-engaged state:
When the clutch cylinder is completely activated,the pressure in circuit(1) starts rising at point P1 on
the graph in Fig.9-42.When the pressure reaches point P2,the piston starts moving to the right
overcoming the force of spring(6 and 7).
Here the flow through chock(2) causes some difference in pressure between circuit (1) and
chamber (3) . As the effective area of the seat of plunger(7) for circuit(1) pressure and that for
chamber(3) pressure are the same,this pressure difference causes the plunger to compress spring(9) to
move to the right,which opens the passage from port B to port T1 to prevent the pressure in circuit
from rising abruptly.As piston(6) moves to the right,the force of spring(8) increases so much.
Both pressures in chamber(3) and circuit(1) also increases gradually,so the clutch engages smoothly
without shocks.
Fig.9-42 When the clutch is in half-engaged state
Dynamic characteristics
Provided P1=3Kgf/㎠(43psi)
P2=3.6 Kgf/㎠(51psi)
P3=5.9 Kgf/㎠(84psi)
T=0.4-0.6 sec
Fig.9-43
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