US 6,279,452 B1Granted

Axial piston motor with bearing flushing

AssigneeBrueninghaus Hydromatik GmbH

InventorJuan Moya

Life of this patent

Estimating the term…

Loading patent…

Abstract

The invention relates to an axial piston motor constructed as a swivel-slide structure with a channel to feed cleaning fluid to the driving shaft bearings. The axial piston motor (1) comprises a swivelling cylinder drum (8) and a driving shaft (3) supported on driving shaft bearings (4, 5). The driving shaft (3) is connected to a driving shaft flange (6) to which movable pistons (11, 12) are coupled through the cylinder bores (9, 10) of the cylinder drum (8), and on which the cylinder drum (8) is supported by a central journal (16). In addition, the invention provides for a control specular element (18) with reniform control elements and a regulating device (26), by which the cylinder drum (8) together with the control specular element (18) can be swivelled. According to the improvement added by the invention, the cleaning fluid channel is taken through the setting journal (25) and control specular element (18) up to the central journal (16). The cleaning fluid channel then continues inside the central journal (16) and the driving shaft (3) and exists at the driving shaft bearings (4, 5) that require feeding.

An axial piston machine (1) of the pivoting carriage type of construction, comprising a pivotable cylinder drum (8), a drive shaft (3), a drive shaft bearing arrangement (4,5) having said drive shaft mounted therein for connection to a drive shaft flange (6), pistons (11, 12) articulated on said flange (6) being moveable in cylinder bores (9, 10) in the cylinder drum (8), a central journal (16) supporting said cylinder drum (8) on said flange (6), a flushing agent duct (45, 47 to 51) for supplying the drive shaft bearing arrangement (4, 5) with flushing agent being arranged in the central journal (16) and in the drive shaft (3), a control mirror body (18) having control nodules in order to connect the cylinder bores (9, 10) cyclically to a high-pressure line and a low-pressure line, a positioning arrangement (26) for tilting the cylinder drum (8) in conjunction with the control mirror body (18), a positioning journal (25) for connecting the positioning arrangement (26) to the control mirror body (18), said positioning arrangement (26) comprising a hydraulically actuatable positioning piston (28) which has a transverse bore (29) having the positioning journal (25) inserted therein, said flushing agent duct (43, 24) being conducted through the positioning journal (25) and the control mirror body (18) up to the central journal (16), said machine (1 having a housing (52) flushed with flushing agent through the flushing agent duct (40-43, 24, 44, 45, 47-51), an opening in said housing (52)for the simultaneous egress of the flushing agent from the housing (2) of the axial piston machine (1), a closing plate (17) includes a longitudinal bore (27), the positioning piston (28) being guided in said longitudinal bore, said closing plate (17) including at least one longitudinal groove (42) into which opens the bore (43) in the positioning journal (25) either directly or indirectly via the transverse-bore (29) in the positioning piston (28), an in-feed line (40) is arranged in the closing plate (17) for feeding the flushing agent into the longitudinal groove (42), wherein the in-feed line (40) is connected to a flushing and feeding pressure valve (41).

Abstract

Claims3