(57) The invention concerns pistons of the liquid-cooled type, and provides an advantageous
alternative to the known types of oil or water-cooled pistons.
The invention is characterised in that the liquid (A) is sealingly enclosed within
a sealed cooling space or chamber provided within the piston (4) so as to form a free
surface, in that a heat-exchanger (3) for effecting heat transfer between said liquid
and oil (c) supplied to the head exchanger is associated with said sealed space, and
in that the oil within said heat-exchanger is arranged to be fed and discharged through
oil passageways (21,11) connected to the exterior of the piston.
Preferably, the liquid (A) is a liquid having a boiling point of 200°C or lower at
atmospheric pressure, and air, or an inert gas (B) is sealingly enclosed within said
sealed space.
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