Opposed swash plate type fluid pressure rotating machine

Abstract

An opposed swash plate type fluid pressure rotating machine in which a first piston and a second piston projecting from opposite ends of a rotary cylinder block reciprocate in a cylinder, respectively following a first swash plate and a second swash plate includes a first tilt bearing for tiltably supporting the first swash plate, a first tilt driving piston for tilting the first swash plate in a direction intersecting with an axis of rotation of the cylinder block, a second tilt bearing for tiltably supporting the second swash plate, and a second tilt driving piston for tilting the second swash plate in a direction intersecting with the axis of rotation of the cylinder block.

1 . An opposed swash plate type fluid pressure rotating machine in which a first piston and a second piston projecting from opposite ends of a rotary cylinder block reciprocate in a cylinder, respectively following a first swash plate and a second swash plate, comprising:
 a first tilt bearing for tiltably supporting the first swash plate;   a first tilt driving piston for tilting the first swash plate in a direction intersecting with an axis of rotation of the cylinder block;   a second tilt bearing for tiltably supporting the second swash plate; and   a second tilt driving piston for tilting the second swash plate in a direction intersecting with the axis of rotation of the cylinder block.   
     
     
         2 . The opposed swash plate type fluid pressure rotating machine according to  claim 1 , comprising:
 a first push-side piston pressure chamber and a first pull-side piston pressure chamber defined on opposite ends of the first tilt driving piston;   a first tilt control valve for switching the flow of working fluid supplied to and discharged from the first push-side piston pressure chamber and the first pull-side piston pressure chamber from and to a high-pressure selector valve;   a second push-side piston pressure chamber and a second pull-side piston pressure chamber defined on opposite ends of the second tilt driving piston; and   a second tilt control valve for switching the flow of working fluid supplied to and discharged from the second push-side piston pressure chamber and the first pull-side piston pressure chamber from and to the high-pressure selector valve.   
     
     
         3 . The opposed swash plate type fluid pressure rotating machine according to  claim 1 , comprising:
 a first translating mechanism for translating a linear movement of the first tilt driving piston into a rotational movement of the first swash plate; and   a second translating mechanism for translating a linear movement of the second tilt driving piston into a rotational movement of the second swash plate.   
     
     
         4 . The opposed swash plate type fluid pressure rotating machine according to  claim 3 , wherein:
 the first translating mechanism includes a first guide groove formed on the first tilt driving piston and a first pin member provided on the first swash plate and movable in the first guide groove; and   the second translating mechanism includes a second guide groove formed on the second tilt driving piston and a second pin member provided on the second swash plate and movable in the second guide groove.