Gm Motor Function; Reduction Gears; First Reduction Section; Second Reduction Section - Kubota KX080-3 Workshop Manual

WSM KX080-3 Mechanism
d. Function

1. Reduction gears

1) Function
The speed reducer consists of two sections: first reduction section with spur gears and second reduction
section with pericycloid-toothed differential gears. The high speed of the hydraulic motor is reduced for low-
speed, large-torque rotation.
2) Behavior
(7)
(6)
(23)
(400)
(9)
(401)
(402)

2.1 First reduction section

(9)
(15)
(6) Input gear
(7) Spur gear
(9) Crankshaft
(15)Shaft

2.2 Second reduction section

(7)
(401)
(4) RV gear A
(5) RV gear B
(7) Spur gear
(9) Crankshaft
(23)Needle bearing
(400)Eccentric elements
(5)
(401)Rotating
(402)Eccentric movement
(4)
IV-M-97
1) The hydraulic motor's rotary motion is trans-
mitted through the shaft (102) to the input gear
(6) that is coupled with the shaft G (15). The
input gear (6) is in mesh with three spur gears
(7).
The spur gears (7) reduce the speed and
rotate in the opposite direction. The first
reduction section is composed of these input
gear (6) and spur gears (7).
The reduction ratio of this section is calculated
as follows.
i1 = - Zi / Zs
where,i1: First reduction section's reduction
ratio
Zi: Number of teeth of input gear
Zs: Number of teeth of spur gear
1) Each of the three spur gears (7) is coupled
with its crankshaft (9). As the spur gear (7)
turns, the crankshaft (9) turns at the same rpm
in the same direction. The eccentric elements
A and B on the crankshaft (9) produce an
eccentric movement (orbital motion), which is
transmitted through the needle bearings (23)
to the RV gears A (4) and B (5).
In this way, the RV gears A (4) and B (5) pro-
vide for an eccentric movement in the same
direction and speed as the spur gear and
crankshaft.
IV Hydraulic System