Axial piston machine of swashplate design

Abstract

An axial piston machine of swashplate design includes a cylindrical drum which is rotatably supported in a housing and has a plurality of cylindrical bores with pistons longitudinally displaceable therein which rest against a swashplate via a joint. The joint has a first joint part with a spherical head and a second joint part with a spherical seat for the head. The joint can be manufactured quickly and using simple, economical production engineering, in that the first joint part is rotatably held in the second joint part, which has an annular groove in the inner surface of a tubular edge, into which a wire has been introduced through a bore.

1 . An axial piston machine ( 1 ), comprising:
 a housing ( 3 );   a cylindrical drum ( 5 ) rotatably supported in the housing ( 3 ) and having a plurality of cylindrical bores ( 6 ) with pistons ( 7 ) longitudinally displaceable therein;   a swashplate ( 11 ), wherein said piston ( 7 ) rest against the swashplate ( 110  via a joint ( 10 ), wherein the joint ( 10 ) comprises a first joint part ( 20 ) having a spherical head ( 21 ) and a second joint part ( 22 ) having a spherical seat ( 23 ) adapted to receive the head ( 21 ),   wherein the first joint part ( 20 ) is rotatably held in the second joint part ( 22 ) in that the second joint part ( 22 ) has an annular groove ( 31 ) in the inner surface of a tubular edge ( 30 ), into which a wire ( 40 ) has been introduced through a bore ( 32 ).   
     
     
         2 . The axial piston machine ( 1 ) according to  claim 1 , wherein the first joint part ( 20 ) is formed on the piston ( 7 ) and the second joint part ( 22 ) rests against the swashplate ( 11 ). 
     
     
         3 . The axial piston machine ( 1 ) according to  claim 1 , wherein the first joint part ( 20 ) rests against the swashplate ( 11 ) and the second joint part ( 22 ) is formed on the piston ( 7 ). 
     
     
         4 . The axial piston machine ( 1 ) according to  claim 1 , wherein the second joint part ( 22 ) has an end face ( 34 ) that faces the first joint part ( 20 ) and the annular groove ( 31 ) is disposed close to the end face ( 34 ). 
     
     
         5 . The axial piston machine ( 1 ) according to  claim 1 , wherein the bore ( 32 ) extends tangentially to the circumference of the annular groove ( 31 ) and leads into the annular groove ( 31 ). 
     
     
         6 . The axial piston machine ( 1 ) according to  claim 1 , wherein the wire ( 40 ) is a spring wire. 
     
     
         7 . The axial piston machine ( 1 ) according to  claim 1 , wherein the first joint part ( 20 ) rests against the swashplate ( 11 ) and has the shape of a ball ( 25 ). 
     
     
         8 . The axial piston machine ( 1 ) according to  claim 1 , wherein the first joint part ( 20 ) is a sliding block ( 24 ) which rests in a planar manner against the swashplate ( 11 ). 
     
     
         9 . The axial piston machine ( 1 ) according to  claim 1 , wherein the second joint part ( 20 ) is a sliding block ( 24 ) which rests in a planar manner against the swashplate ( 11 ).