Entire Reduction Gears - Kubota KX080-3 Workshop Manual

WSM KX080-3 Mechanism
Movement at half-turn (180°)
Movement at full turn

2.3 Entire reduction gears

The entire reduction gears behave as the multiplication of the first and second reduction sections. Accord-
ingly, the output rpm (reduction ratio i) of the entire reduction gears, which is generated by one turn of the
hydraulic motor shaft, is calculated as follows.
i = i1 x i2
= - Zi / Zs x (Zp-Zr) / Zp
where,i1: First reduction section's reduction ratio
i2: Second reduction section's reduction ratio
(1)
(17)
(4)
(401)
IV-M-98
2) The tooth faces of RV gears A (4) and B (5) are in
constant mesh with the pins (17) (number of pins:
Zp). During the eccentric movement by the RV
gears A and B, their contact points shift sequen-
tially rolling over the faces.
In one eccentric motion, the pins (17) move
together with the hub (1) by the number of pins
that is the difference Zp-Zr , where Zr represents
the number of teeth of RV gears A and B and Zp
the number of pins. The hub (1) turns in the same
direction as the eccentric motion of the RV gears.
The rotation of this hub (1) gives out an output.
In the second reduction section, the speed is
reduced with the crankshaft, RV gears, pins and
hub.
The reduction ratio of this section is calculated as
follows.
i2 = (Zp-Zr) / Zp
where,i2: Second reduction section's reduc-
tion ratio
Zr: Number of teeth of RV gears A and B
Zp: Number of pins
(1) Hub
(17)Pin
(4) RV gear A or B
(403)Eccentric element on crankshaft
IV Hydraulic System