摘要:
A hydraulic machine comprising a barrel (12) driven in rotation by an input shaft (6), comprising cylinders (14) each receiving a piston (16) bearing on one side on a tiltable tray (20) that can pivot about an axis perpendicular to the input shaft, the cylinders bearing, on the side opposite the tray, on a circular closing plate (24) comprising a low pressure manifold and a high pressure manifold separated at the ends of same by two intermediate spaces, at least one of these spaces comprising at least one connection to a precompression chamber, characterised in that the tilt of the tray (20) comprises a second tilt angle that gives an angular offset of the top and bottom dead centres of the pistons (16), relative to the mid points of the intermediate spaces.
摘要:
Variable displacement axial piston device having a rotating cylinder block (120)comprises a trunnion type movable swash plate (150) supported in a rotatably sliding manner by a bearing portion (205). With the aim of reducing the rotating frictional resistance in said bearing portion (205) two embodiments of swash plate (150) are presented. In a first embodiment an outer circumferential surface of a trunnion shaft (160) includes at least one suction groove (162) that forms a pocket portion (162a) between the suction groove (162) and the inner surface of the bearing portion (205). The pocket portion (162a) is opened to an inner space of housing on at least one side in an axis line direction of the trunnion shaft (160). In a second embodiment an outer circumferential surface of the trunnion shaft (160) includes a large diameter portion (165) at a middle part, an outer side small diameter portion (166a) and an inner side small diameter portion (166b).