Tadano TM-2000-1, Service Manual

Page: 70 / 194

F - 2 F - 2
Hydraulic Motor(Winch)
5
W102-0581E
F-2 Hydraulic Motor(Winch)
1. Operational explanation
When pressure oil is supplied from the other slit in
the control plate, half of pistons in the cylinder block
receive the pressure and are pushed out.
The pistons pushed out push the flange portion of
the drive shaft upward, and rotate the drive shaft.
At this time, the cylinder block slide on the control
plate.
When rotating, each of seven pistons reciprocates
between top dead center (OT) and bottom dead
center (UT), and then obtains strokes of (h)
according to inclination (a).
The amount of oil that corresponds to the sectional
area of the piston (F) × piston stroke (h) is supplied
from one of slits in the control plate at the process of
the piston of UT to OT.
2. Structural explanation
Cylinder block-9 is maintained rotatably with the
center pin and the control plate.
Cylinder block-9 is pressed against the control
plate by the corned disc springs at no-load running.
The pressure rises up between the cylinder block 9
and the control plate, balances cylinder block-9 and
the control plate, and a oil film is always formed
between them.
Bearings-16 and 17 are combined with bearing
case-11, and installed in drive shaft-10 .
These bearings receive the load caused in axially
and the radial.
Oil seal-24, O rings-6 and 19 are used for the seal of
the driving mechanism to the outside.