Cam Profile for a Hydrostatic Radial Piston Machine, and Hydrostatic Radial Piston Machine

Abstract

A cam profile for a hydrostatic radial piston machine includes lobes positioned along a circumferential direction, each lobe comprising a lobe portion of rising type and a lobe portion of falling type. As the cam profile extends in the circumferential direction, a radial dimension of the cam profile mostly increases in each portion of rising type, and mostly decreases in each portion of falling type Shapes of at least two lobe portions of the same type are different.

1 . A cam profile for a hydrostatic radial piston machine, comprising:
 a plurality of lobes positioned along a circumferential direction, each of the plurality of lobes including:
 a lobe portion of rising type; and 
 a lobe portion of falling type, 
   wherein as the cam profile extends in the circumferential direction, a radial dimension of the cam profile mostly increases in each lobe portion of rising type, and mostly decreases in each lobe portion of falling type, and   wherein shapes of at least two lobe portions of the same type are different.   
     
     
         2 . The cam profile according to  claim 1 , wherein lobe depths of at least two lobe portions of the same type are different. 
     
     
         3 . The cam profile according to  claim 1 , wherein the angular extents of at least two lobes are different. 
     
     
         4 . The cam profile according to  claim 1 , wherein:
 the plurality of lobes includes at least one first lobe and at least one second lobe, and   each second lobe has a greater angular extent and a greater lobe depth than each first lobe.   
     
     
         5 . The cam profile according to  claim 1 , wherein:
 whole lobes of the plurality of lobes are distributed amongst sectors, and   lobes in at least one of the sectors have greater angular extents than lobes in at least one other of the sectors.   
     
     
         6 . The cam profile according to  claim 2 , wherein angular extents of at least two lobe portions of different type are different. 
     
     
         7 . A cam profile for a hydrostatic radial piston machine, comprising:
 a plurality of lobes positioned along a circumferential direction, each of the plurality of lobes including:
 a lobe portion of rising type; and 
 a lobe portion of falling type, 
   wherein as the cam profile extends in the circumferential direction, a radial dimension mostly increases in each lobe portion of rising type and mostly decreases in each lobe portion of failing type, and   angular extents of at least two lobe portions of different type are different.   
     
     
         8 . A hydrostatic radial piston machine comprising:
 a cam body including:
 a cam profile having a plurality of lobes positioned along a circumferential direction, each of the plurality of lobes including: 
 a lobe portion of rising type; and 
 a lobe portion of falling type, 
   wherein as the cam profile extends in the circumferential direction, a radial dimension of the cam profile mostly increases in each lobe portion of rising type, and mostly decreases in each lobe portion of falling type, and   wherein shapes of at least two lobe portions of the same type are different.   
     
     
         9 . The hydrostatic radial piston machine according to  claim 8 , wherein:
 whole lobes of the plurality of lobes are distributed amongst sectors;   lobes in at least one of the sectors have greater angular extents than lobes in at least one other of the sectors;   the hydrostatic radial piston machine further comprises pistons rotatable relative to and engaging with the cam profile, and   a number of pistons engaging with at least one sector does not change with rotation angle of the pistons.