Double-cylinder waterpower engine

The hydraulic engine has reduced water flow speed and increased piston cross section area and stroke and thus less dynamic energy loss and high water energy converting efficiency. The rack block sliding with the rotation of the crankshaft in the horizontal direction perpendicular to the crankshaft drives the gear to transmit the motive force to water distributing block for rotating water distribution. When the piston is in the upper dead point, the water distributing block plugs up the water inlet and water outlet; and when the crankshaft rotates further, the rotating water distributing blockmakes the water outlet communicated with the water exhaust cylinder to produce work and exhaust water. The flywheel accumulates energy and the rotating main shaft outputs power via the speed varying planetary gear system.