Patent ID: 8636488

Claim:
Hydraulic motor or pump ( 2 ), comprising a first ( 4 ) and a second body ( 6 ) which in association with final boundaries ( 8 , 10 ) defines an annular cavity ( 12 ) with a constant cross-sectional opening in relation to the centre ( 14 ) of the annular cavity ( 12 ) where the first body ( 4 ) is static and the second body ( 6 ) is rotatable, or vice versa, and where the annular cavity ( 12 ) is connected with passages ( 22 , 24 ) respectively to a hydraulic pressure side ( 30 ) and a pressure neutral side ( 32 ) and where the first or the second body comprises evenly spaced radial projecting protrusions ( 16 ) which connecting the bodies and divides the annular cavity ( 12 ) in a number of chambers ( 18 ) which are alternately placed under hydraulic pressure, and are pressure neutral, characterized in, that the static body ( 4 , 6 ) comprises a number of evenly spaced, radial protrusions ( 16 ) along the annular cavity ( 12 ) which is in abutment with the rotatable body ( 4 , 6 ), and where the rotatable body comprises a number of evenly spaced radial displaceable protruding sliders ( 20 ) along the annular cavity ( 12 ), said sliders being in abutment with the static object and follows the motion of the rotatable body, where the radial protrusions ( 16 ) includes a first passage ( 22 ) and a second passage ( 24 ) with outflow openings respectively at a first side and at a second side of the respective protrusions, the passages respectively connected to hydraulic high pressure ( 30 ) and hydraulic low pressure ( 32 ) and so that a tangential division of the passages are adapted the tangential division of the sliders, by which at any time in each chamber there is a slider ( 20 ) delimits the hydraulic high pressure ( 30 ) from hydraulic low pressure ( 32 ), and where a number of sliders ( 20 ) represent more than one per protrusion ( 16 ).