Hyundai HX140L, Manual

Page: 55 / 819

2-7
Valve block group
The valve block group consists of valve
block (312), valve plate (313) and valve
plate pin(885).
The valve plate having two melon-shaped
ports is fixed to the valve block and feeds
and collects oil to and from the cylinder
block.
The oil changed over by the valve plate is
connected to an external pipeline by way
of the valve block.
Now, if the drive shaft is driven by a prime
mover (electric motor, engine, etc), it
rotates the cylinder block via a spline
linkage at the same time. If the swash
plate is tilted as in Fig (previous page) the
pistons arranged in the cylinder block
make a reciprocating motion with respect
to the cylinder block, while they revolve
with the cylinder block.
If you pay attention to a single piston, it
performs a motion away from the valve
plate (oil sucking process) within 180
degrees, and makes a motion towards the
valve plate (or oil discharging process) in
the rest of 180 degrees. When the
swash plate has a tilting angle of zero, the
piston makes no stroke and discharges
no oil. (3)
885
313
312
21092MP07