Hyundai r35z-7 Workshop Manual page 85

3)
TWO SPEED CHANGE MECHANISM
(1)
When running at 1st speed (low speed)
Swash plate (5) has three faces, from "a" to "c", as shown below in the figure and installed in the
flange holder that is piston motor housing with two steel balls (6) in the condition where it can be
tilted.
When the control valve is set to the 1st speed position, spool (41) is placed in the position shown
below in the figure by the force of spring (42), and the passage of swash plate control piston (19)
passes across the Pi1 and Pi2 port positions and led to the tank port. Therefore, the force pushing
up the swash plate control piston (19).
Fp = (Ap P) = 0
When steel ball (6) is placed on the tilting center, the balance of moment acting on swash plate (5)
is in the condition of ( F+Fs1) L1 > (Fp+Fs2) Lo depending on the total
piston sub assy (15) and the force of spring (9) Fs1 and Fs2, then swash plate (5) stables at the
face a and the swash plate angel is , and consequently the motor speed corresponding to the 1st
speed, low speed, is obtained.
( ( F+Fs1) L1 > (Fp+Fs2) Lo
Valve plate(25)
Port C(Low pressure)
Port B(High pressure)
Fp : Swash plate control piston thrust
Ap : Swash plate control piston pressure receiving area
P : Pressure
M2
M1
Pi2
Pi1
Face c
Piston
sub assy(15)
F + Fs1
Spring(9)
Swash plate(5)
At 1st speed(low speed)
2-53
Spool(41)
Spring(42)
Face b
Steel ball(6)
L1
L
0
Fp + Fs2
Spring(20)
Swash plate control piston(19)
Face a
F of driving force of
Low pressure
R35Z72TM08