Axial piston machine having a sealed bearing box

Claim 2

A reciprocating-piston machine of the inclined disc type, comprising a rotatable driving shaft, a drum-shaped cylinder block directly connected thereto for rotation with said shaft and arranged in a housing of the machine, cylinder bores in said block disposed in a circle around the axis of rotation of said driving shaft, longitudinally-displaceable pistons in said cylinder bores, piston shoes connected to said pistons and supported on a stationary inclined disc swivellably adjustable in the machine housing, a control plate at the end of the cylinder block remote from the inclined disc serving to connect the cylinder bores alternately to a suction duct and a pressure duct for fluid medium to be conveyed through the machine, a bearing box located outside the machine housing and surrounding an intermediate part of the driving shaft lying outside the machine housing, two spaced-apart roller bearings in the bearing box serving as the sole means of support for the driving shaft, the cylinder block being mounted on the free end of the bearing-free portion of the driving shaft lying within the machine housing, and slide-ring sealing means adapted to seal the machine housing from the bearing box, the said sealing means including a rotating ring tightly surrounding and directly secured to the driving shaft and arranged to bear in a fluid-tight manner against a stationary ring inserted in a bush associated with the bearing box.

Claim 3

A machine according to claim 1, in which the machine housing and the bearing box are formed as separate components and are interconnected in the region of the slide-ring sealing means.

Claim 4

A machine according to claim 1, in which the free end of the driving shaft engages, by way of notched teeth, with corresponding teeth in the cylinder block.

Claim 5

A machine according to claim 1, in which the cylinder block bears at one of its end-faces against a control plate having a surface of part-spherical shape.

Claim 6

A machine according to claim 1, in which the roller bearings take the form of tapered roller bearings.

Claim 7

A reciprocating-piston machine of the inclined disc type, comprising a rotatable driving shaft, a drum-shaped cylinder block directly connected thereto for rotation with said shaft and arranged in a housing of the machine, cylinder bores in said block disposed in a circle around the axis of rotation of said driving piston shoes connected to said pistons and supported on a stationary inclined disc swivellably adjustable in the machine housing, a control plate at the end of the cylinder block remote from the inclined disc serving to connect the cylinder bores alternately to a suction duct and a pressure duct for fluid medium to be conveyed through the machine, a bearing box located outside the machine housing and surrounding an intermediate part of the driving shaft lying outside the machine housing, two spaced-apart roller bearings in the bearing box serving to support the driving shaft, slide-ring sealing means adapted to seal the machine housing from the bearing box, the said sealing means including a rotating ring tightly surrounding and directly secured to the driving shaft and arranged to bear in a fluid-tight manner against a stationary ring inserted in a bush associated with the bearing box, radial shaft sealing means on both sides of the roller bearings in the bearing box, and an outwardly-directed air-vent duct communicating with a space between the said radial shaft sealing means and the stationary ring of the slide-ring sealing means.

Claim 8

A reciprocating-piston machine of the inclined disc type, comprising a rotatable driving shaft, a drum-shaped cylinder block directly connected thereto for rotation with said shaft and arranged in a housing of the machine, cylinder bores in said block disposed in a circle around the axis of rotation of said driving piston shoes connected to said pistons and supported on a stationary inclined disc swivellably adjustable in the machine housing, a control plate at the end of the cylinder block remote from the inclined disc serving to connect the cylinder bores alternately to a suction duct and a pressure duct for fluid medium to be conveyed through the machine, a bearing box located outside the machine housing and surrounding an intermediate part of the driving shaft lying outside the machine housing, two spaced-apart roller bearings in the bearing box serving to support the driving shaft, slide-ring sealing means adapted to seal the machine housing from the bearing box, the said sealing means including a rotating ring tightly surrounding and directly secured to the driving shaft and arranged to bear in a fluid-tight manner against a stationary ring inserted in a bush associated with the bearing box, radial shaft sealing means on both sides of the roller bearings in the bearing box, and an outwardly-directed air-vent duct communicating with a space between the said radial shaft sealing means and the stationary ring of the slide-ring sealing means.