Axial Piston Machine having a Retraction Plate, and Method for the Production Thereof

Abstract

An axial piston machine comprises a cylinder drum in which a multiplicity of pistons are arranged in a longitudinally displaceable manner. The pistons are supported, via sliding blocks, on a running surface which is inclined relative to the cylinder drum axis. The sliding blocks are held, at that side thereof which faces away from the running surface, by means of a retraction plate. The retraction plate is produced from processed sheet metal in a non-cutting punching and stamping process.

1 . An axial piston machine comprising:
 a cylinder drum;   a plurality of pistons arranged longitudinally displaceably in the cylinder drum; and   a retraction plate produced from a refined metal sheet, without cutting, in a stamping/embossing operation,   wherein the plurality of pistons are supported via sliding shoes on a running surface inclined with respect to a drum axis of the cylinder drum, and   wherein the sliding shoes are held, so as to bear against the running surface by means of the retraction plate on a retention surface facing away from their sliding surface bearing against the running surface.   
     
     
         2 . The axial piston machine as claimed in  claim 1 , wherein the retraction plate has a region in the form of an envelope of a cone frustum which is shaped such that, in a nonloaded state, a distance of the retraction plate at its outer circumference from the running surface is shorter than in a region of a retraction plate bearing. 
     
     
         3 . The axial piston machine as claimed in  claim 1 , wherein a circumferential edge runs in each case partially parallel to an outer region of a sliding shoe reception orifice in each case. 
     
     
         4 . The axial piston machine as claimed in  claim 1 , wherein the retraction plate bearing includes a spherical cap in the retraction plate. 
     
     
         5 . The axial piston machine as claimed in  claim 4 , wherein a diameter of the spherical cap and a diameter of the sliding shoe reception orifices are equal. 
     
     
         6 . A method for the production of a retraction plate for an axial piston machine, comprising:
 generating a refined metal sheet with a bearing surface finish-machined so as to bear against the sliding shoes;   stamping sliding shoe orifices into the refined metal sheet; and   forming a retraction plate bearing in the refined metal sheet.   
     
     
         7 . The method as claimed in  claim 6 , wherein the metal sheet is formed such that, in a cross section through the retraction plate, the bearing surface forms an angle of less than 180°. 
     
     
         8 . The method as claimed in  claim 7 , wherein an outer region is removed by stamping, so that a circumferential edge of the retraction plate runs in each case partially parallel to an outer region of a sliding shoe reception orifice in each case. 
     
     
         9 . The method as claimed in  claim 6 , wherein the retraction plate bearing is introduced in the form of a spherical cap into the metal sheet by means of an embossing operation. 
     
     
         10 . The method as claimed in  claim 6 , further comprising:
 forming a molding from a planar metal sheet (i) by embossing the retraction plate bearing in the form of a spherical cap, and (ii) by generating a region in the form of an envelope of a cone frustum outside the retraction plate bearing.