PISTON
AND
PISTON
RINGS
Piston circumference
has
a special elliptic shape
in
consideration of expansion due
to
explosion
heat. Piston head
is
flat-formed. Furthermore, ribs
are
provided between the piston head and top
ring
to
reduce distortion and
to
help heat radiation.
Piston
is
made of special aluminum alloy of low thermal expansion and high temperature
resistance.
Top
ring
is
of
key
stone type which can stand against heavy load, and the sliding surface
to
the
cylinder wall is shaped into barrel face which
is
well fitted
to
the wall and plated with hard chrome.
Second ring
is
of under-cut type which
is
effective
to
prevent oil rising.
Oil ring
is
effective
to
scrape oil because it is closely fitted
to
the cylinder wall
by
coil expander
and the upper and
lower ends of its sliding surface are cut diagonally
to
raise fare pressure
to
the
cylinder walls.
A part of scraped oil
is
forced into the inside of piston through oil escape holes of rings
and
piston. The oil ring
is
plated with hard chrome
to
increase wear resistance quality.
Pistons
and
piston
rings
(4)
(1)
1.
Rib
(2)
~
~-~~
15,
1
•
,
/~o
•
2.
Top ring
3.
Barrel face
4.
Hard chrome plating
5.
Second ring
6.
Coil expander ring
(6)
CONNECfING
RODS
Connecting
rod
is
used
to
connect the piston with the crankshaft. The big end of the connecting
rod
has crankpin bearings (split type) and the small end has a bushing (solid type).
(3)-_~
(1)-----1/1
1.
Connecting rod
2.
Crankpin bearing
3.
Bushing
I
!
48
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