Abstract: A piston-cylinder unit including a piston that is fluid pressure supported and movable in a linear manner in a cylinder, wherein the cylinder, a face wall of the piston and a face wall of the cylinder define a compression cavity which is at a minimum size in a portion of a top dead center of the piston, wherein the compression cavity is connected in a fluid transferring manner with a bearing gap which is formed between a cylinder inner circumferential wall and a piston outer circumferential wall, wherein a plurality of fluid outlet nozzles are arranged in at least one cross-sectional plane of the cylinder in the cylinder inner circumferential wall along a circumference, which fluid outlet nozzles open into the bearing gap and are connected with a supply conduit for a pressurized fluid.

Abstract: A piston-cylinder unit including a piston (103) that is fluid pressure supported and movable in a linear manner in a cylinder (2), wherein the cylinder (2), a face wall (116) of the piston (103) and a face wall (12) of the cylinder define a compression cavity (18) which is at a minimum size in a portion of a top dead center (TDC) of the piston (103), wherein the compression cavity (18) is connected in a fluid transferring mariner with a bearing gap (19) which is formed between a cylinder inner circumferential wall (14) and a piston outer circumferential wall (136), wherein a plurality of fluid outlet nozzles (32?, 34?) are arranged in at least one cross-sectional plane (Q2, Q3) of the cylinder (2) in the cylinder inner circumferential wall (14) along a circumference, which fluid outlet nozzles (32?, 34?) open into the bearing gap (19) and are connected with a supply conduit for a pressurized fluid, and wherein a plurality of fluid outlet nozzles (130?) which open into the bearing gap (19) are arranged in at l

Abstract: A piston/cylinder unit comprising a cylinder, a piston which reciprocates in the axial direction of the cylinder between first and second piston positions, and a fluid bearing provided between the piston and the cylinder which supports the piston such as to be axially displaceable in the cylinder and defines the piston-side bearing surface, enclosing the circumference of the piston at least over a part of the axial extension of the piston, whereby the fluid bearing comprises a number of outlet nozzles for the fluid arranged in the inner circumferential wall of the cylinder. The outlet nozzles are arranged such that when the piston is in the second position, first outlet nozzles provide the front or middle region of the piston-side bearing surface relative to the piston longitudinal extension and second outlet nozzles provide the middle region of the piston side bearing surface with pressure fluid.

Abstract: An axially driven piston-cylinder unit comprising a cylinder, a piston that can be moved back and forth in the axial direction of the cylinder, between first and second piston positions, and a drive element that can be moved back and forth in the axial direction of the cylinder and is mechanically connected to the piston by means of a piston rod. The piston rod is connected to the piston or the drive element against the pretension of an elastic device, in such a way that it can be moved axially in relation to the piston or the drive element, such that when the piston head comes into contact with the front wall of the cylinder borehole, on the side of the cylinder head, the other movement of the drive element is performed against the force of the elastic device, thus braking the drive element.

Abstract: A piston/cylinder unit comprising a cylinder, a piston which reciprocates in the axial direction of the cylinder between first and second piston positions, and a fluid bearing provided between the piston and the cylinder which supports the piston such as to be axially displaceable in the cylinder and defines the piston-side bearing surface, enclosing the circumference of the piston at least over a part of the axial extension of the piston, whereby the fluid bearing comprises a number of outlet nozzles for the fluid arranged in the inner circumferential wall of the cylinder. The outlet nozzles are arranged such that when the piston is in the second position, first outlet nozzles provide the front or middle region of the piston-side bearing surface relative to the piston longitudinal extension and second outlet nozzles provide the middle region of the piston side bearing surface with pressure fluid.

Abstract: An axially driven piston/cylinder unit comprising a cylinder, a piston being movable between first and second piston positions in the axial direction of the cylinder, a fluid bearing between the piston and the cylinder and defining a bearing surface on the piston side enclosing said piston over a part of the axial length of the piston, and a drive element mechanically-connected to the piston by means of a piston rod. The piston rod is embodied to permit and compensate for a radial offset, or an inclination between the cylinder axis and the longitudinal axis, defining the movement direction of the drive element. The piston rod is provided with a first drive-side joint section, the piston rod is also provided with a second piston-side joint section and that the second piston-side joint section is provided in the rear region of the piston, away from the piston crown.

Abstract: A linear compressor comprising a cylinder, a hydraulically borne piston that can be longitudinally oscillated inside the cylinder, and a drive unit driving the movement of the piston. The compressor is characterized in that at least one of the lateral faces of the piston and the cylinder that face each other is provided with an abrasion-resistant bearing coating.