Kubota KX080-4 Workshop Manual page 129

KX080-4, WSM
[G] Two-Stage Planetary Gear Decelerator
d)When reversing 1
• After valve unit braking makes it stop, the motor tries
to turn in reverse due to accumulated pressure in its
main line.
• This reverse pressure makes the shuttle valve
(sleeve) inside the check valve seat on the
low-pressure side of the check valve; this forms a
passage between the port (Pv2) pressurized by the
reverse pressure and the port (Cv) linked by the
main line, giving the reverse pressure access to the
Cv port.
(1) Reverse pressure
e)When reversing 2
• The reverse pressure pushes in the opposite
direction during check valve braking at the same
time.
• The flow regulating valve inside the check valve,
which is now on the low-pressure side, is open at a
certain flow rate to oil from inside the damper
chamber. As a result, the check valve is shifted at a
certain speed.
• The check valve eventually seats, so the passage
formed between the Pv2 and Cv ports is blocked.
(1) Reverse pressure
• The motor shaft (1) is coupled to the drive gear (2)
and the spline, so the drive force of the motor is
transmitted to planetary gear A (3), which meshes
with the drive gear (2).
• Planetary gear A (3) meshes with the ring gear of the
decelerator housing (4). As a result, when it rotates,
it turns around the ring gear.
• Planetary gear A (3) is held to holder (5) by the
bearing and the holder (5) transmits the rotary
motion of planetary gear A (3) to the sun gear (6),
which is coupled to the spline.
• Sun gear (6) meshes with planetary gear B (7) and
transmits the rotary motion to planetary gear B (7) in
the same way as the first stage.
• As planetary gear B (7) meshes with the ring gear of
the housing (4), it rotates around it as it turns.
• Planetary gear B (7) is held to holder (8) by the
bearing and the holder (8) transmits the rotary
motion of planetary gear B (7) to the pinion shaft,
which is coupled to the spline.
(1) Motor shaft
(2) Drive gear
(3) Planetary gear A
(4) Housing
(5) Holder
3-M33
HYDRAULIC SYSTEM
(2) Seat
RY9212148HYM0039US0
RY9212148HYM0040US0
(6) Sun gear
(7) Planetary gear B
(8) Holder
(9) Pinion shaft
RY9212148HYM0041US0
KiSC issued 08, 2015 A