(57) A fluid power transmission system comprises a fluid power transmitting unit (12)
having a mechanical power input provided by movement of a piston (15) relative to
a body portion (14) of the transmitting unit (12) and a fluid power receiving unit
(13) having a mechanical power output provided by movement of a piston (15) relative
to a body portion (14) of the receiving unit (13). The piston (15) divides a space
within the body portion (14) of each unit (12, 13) into first (16) and second (17)
chambers. The first chambers (16) of the units (12, 13) are interconnected by a liquid
and the second chambers (17) of the units (12, 13) are interconnected by a gas.
Means are disclosed which compensate for changes in the volume of the liquid interconnection
due to temperature changes so that a mechanical output from the receiving unit (13)
is not affected by such volume changes.
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