(57) [summary] [purpose] I to reduce the tilting radius of the swash plate. [Configuration] In the switching valve 37 to the control port 36 on formed on the top dead center side and bottom dead center side of the valve plate 28 by supplying high pressure oil swash plate 27 And so as to tilt the said the body 32 on both sides of the swash plate 27 a pair of supporting protrusions 33 having an arcuate sliding surface 34 respectively provided integrally with the arc-shaped sliding surface 34 and the casing 20 The swash plate 27 is fitted to the arc-shaped bearing concave surface 35 which is formed integrally with supported directly by the casing 20, it is possible to reduce the tilting radius of the swash plate.
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