Axial piston machine

Abstract

An axial piston machine may include a a housing having vapor, cylinder chamber and wobble-plate chambers. The machine may have cylinders arranged annularly around a shaft in the cylinder chamber and having pistons arranged therein in a translationally movable manner, a valve disk connected to the shaft in a rotationally fixed manner and arranged in the vapor chamber, and a wobble plate connected to one of the pistons via a cup and ball bearing and to the shaft in a rotationally fixed manner, the wobble plate being arranged in the wobble-plate chamber. The housing may have steam-chamber, cylinder, and wobble-plate housing parts connected to one another. A cylinder sleeve having a radially protruding collar may be provided in at least one cylinder, wherein the cylinder sleeve may be retained via the collar in a cut-out in the cylinder housing part, which may adjoin a parting plane between the vapor-chamber and cylinder housing parts. The vapor chamber may be closed off by a first cover, which may be connected to the vapor-chamber housing part and which may be designed as a shaped sheet-metal part.

1 . An axial piston machine, comprising:
 a housing having a vapor chamber, a cylinder chamber and a wobble-plate chamber;   cylinders arranged annularly around a shaft in the cylinder chamber and having pistons arranged therein in a translationally movable manner;   a valve disk connected to the shaft in a rotationally fixed manner and arranged in the vapor chamber;   a wobble plate connected to one of the pistons via a cup and ball bearing and to the shaft in a rotationally fixed manner, the wobble plate being arranged in the wobble-plate chamber;   wherein the housing has a steam-chamber housing part, a cylinder housing part, and a wobble-plate housing part connected to one another;   wherein a cylinder sleeve having a radially protruding collar is provided in at least one cylinder, wherein the cylinder sleeve is retained by via the collar in a cut-out in the cylinder housing part, which adjoins a parting plane between the vapor-chamber housing part and the cylinder housing part; and   wherein the vapor chamber is closed off by a first cover, which is connected to the vapor-chamber housing part and which is designed as a shaped sheet-metal part.   
     
     
         2 . The axial piston machine according to  claim 1 , wherein at least one of:
 the cylinder sleeve is made of one of stainless steel or a steel alloy with 3.20-3.50% by weight of C, 1.60-2.10% by weight of Si, 0.60-0. 80% by weight of Mn, 0.35-0.50% by weight of P, maximally 0.06% by weight of S, 0.20-0.40% by weight of Cr, 0.30-0.50% by weight of Mo, and iron for the remainder; and   the cylinder sleeve is provided with a coating configured to reduce at least one of wear and friction.   
     
     
         3 . The axial piston machine according to  claim 1 , wherein the cylinder sleeve has at least two passage openings for discharging steam and that communicate with corresponding discharge channels in the cylinder housing part, wherein the discharge channels are defined by the cylinder housing part and the cylinder sleeve. 
     
     
         4 . The axial piston machine according to  claim 3 , wherein the cylinder sleeve has at least a third passage opening, which serves as auxiliary outlet and vents the cylinder in response to a movement of the piston to an upper dead center position. 
     
     
         5 . The axial piston machine according to  claim 1 , wherein the wobble-plate chamber is closed off by a second cover, which is designed as a shaped sheet-metal part. 
     
     
         6 . The axial piston machine according to  claim 1 , wherein:
 the cup and ball bearing has a cut-out protruding radially outwards;   the cylinder sleeve has a cut-out, which is open towards a front side and in which the cut-out of the cup and ball bearing is guided in terms of a lock against rotation; and   the cup and ball bearing has two sliding feet arranged adjacent to the cut-out of the cup and ball bearing and supported on a guide bushing.   
     
     
         7 . The axial piston machine according to  claim 1 , wherein at least one of:
 at least one blind plug is provided for one of the cylinders and is insertable into the one of the cylinders instead of a cylinder sleeve and closes an inlet opening of the one of the cylinders that faces the vapor chamber; and   the cylinder sleeve is designed in such a way that it provides for an at least partial immersion of the wobble plate.   
     
     
         8 . The axial piston machine according to  claim 1 , wherein the first cover has projections embossed in a direction of the vapor chamber, the projections reducing a volume of the vapor chamber. 
     
     
         9 . The axial piston machine according to  claim 1 , wherein the first cover has at least two connections for connecting a pressure sensor or a temperature sensor to a flat front surface of the first cover. 
     
     
         10 . The axial piston machine according to  claim 1 , wherein at least one of:
 a volume of the vapor chamber is between 30 and 100 cm 3 ;   a cross sectional area of an inlet into the vapor chamber is between 78 mm 2  and 200 mm; and   a displaced volume of the cylinder is between 25 cm 3  and 75 cm 3 .   
     
     
         11 . The axial piston machine according to  claim 1 , further comprising ribs arranged in the wobble-plate housing part. 
     
     
         12 . The axial piston machine according to  claim 11 , wherein the wobble-plate housing part together with the ribs is designed as an integral cast part. 
     
     
         13 . The axial piston machine according to  claim 6 , wherein the guide bushing includes a cut-out, which is only open between the cylinder housing part and the wobble-plate housing part, is arranged in the wobble-plate housing part, and into which the cut-out of the cup and ball bearing dips. 
     
     
         14 . The axial piston machine according to  claim 13 , wherein the guide bushing is made of stainless steel. 
     
     
         15 . The axial piston machine according to  claim 13 , wherein the guide bushing has a radially protruding collar that retains the guide bushing in a separating plane between the cylinder housing part and the wobble-plate housing part. 
     
     
         16 . The axial piston machine according to  claim 1 , wherein at least one of the housing parts has a corrosion protection layer on an inner side. 
     
     
         17 . The axial piston machine according to  claim 1 , further comprising an insulating element, which surrounds at least the vapor chamber by forming an air gap. 
     
     
         18 . The axial piston machine according to  claim 17 , wherein the insulating element is screwed to the vapor-chamber housing part. 
     
     
         19 . A heat recovery system in a motor vehicle comprising an axial piston machine including:
 a housing having a vapor chamber, a cylinder chamber and a wobble-plate chamber;   cylinders arranged annularly around a shaft in the cylinder chamber and having pistons arranged therein in a translationally movable manner;   a valve disk connected to the shaft in a rotationally fixed manner and arranged in the vapor chamber;   a wobble plate connected to one of the pistons via a cup and ball bearing and to the shaft in a rotationally fixed manner, the wobble plate being arranged in the wobble-plate chamber;   wherein the housing has a steam-chamber housing part, a cylinder housing part, and a wobble-plate housing part connected to one another;   wherein a cylinder sleeve having a radially protruding collar is provided in at least one cylinder, wherein the cylinder sleeve is retained via the collar in a cut-out in the cylinder housing part, which adjoins a parting plane between the vapor-chamber housing part and the cylinder housing part; and   wherein the vapor chamber is closed off by a first cover, which is connected to the vapor-chamber housing part and which is designed as a shaped sheet-metal part.   
     
     
         20 . An axial piston machine comprising:
 a housing having a vapor chamber, a cylinder chamber and a wobble-plate chamber;   cylinders arranged annularly around a shaft in the cylinder chamber and having pistons arranged therein in a translationally movable manner;   a valve disk connected to the shaft in a rotationally fixed manner and arranged in the vapor chamber;   a wobble plate connected to one of the pistons via a cup and ball bearing and to the shaft in a rotationally fixed manner, the wobble plate being arranged in the wobble-plate chamber;   wherein the housing has a steam-chamber housing part, a cylinder housing part, and a wobble-plate housing part connected to one another;   wherein a cylinder sleeve having a radially protruding collar is provided in at least one cylinder, wherein the cylinder sleeve is retained via the collar in a cut-out in the cylinder housing part, which adjoins a parting plane between the vapor-chamber housing part and the cylinder housing part;   wherein the vapor chamber is closed off by a first cover, which is connected to the vapor-chamber housing part and which is designed as a shaped sheet-metal part;   wherein the cup and ball bearing has a cut-out protruding radially outwards;   wherein the cylinder sleeve has a cut-out, which is open towards a front side and in which the cut-out of the cup and ball bearing is guided in terms of a lock against rotation; and   the cup and ball bearing has two sliding feet arranged adjacent to the cut-out of the cup and ball bearing and supported on a guide bushing.