| 摘要 |
A device (1) for rotatably driving a central shaft (2) including a fixed enclosure (3) which at least partially defines a toric chamber (4), at least two pairs of pistons (7, 8; 7', 8') rigidly paired with two moving parts (13, 13') centred on the shaft, and a kinematic drive system (11) for rotatably driving the central shaft via said moving parts paired to the pistons. The kinematic system comprises two bevel gears (16, 16') placed facing each other and centred on the shaft to act as differential side gears, at least two differential bevel planet wheels (20, 21, 22) rigidly coupled to the rotatable central shaft, and reverse-lock devices (26, 26', 39) arranged so that the moving parts may only rotate in one direction.
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