Axial piston motor

Abstract

The invention relates to an axial piston motor ( 1 ), especially a compressor for the air conditioning system of a motor vehicle, comprising a housing ( 2 ) and a compressor unit ( 6 ). Said compressor unit is driven by a drive shaft ( 8 ), is arranged in the housing ( 2 ), and is provided for sucking and compressing a cooling medium. The compressor unit ( 6 ) comprises pistons ( 15 ) which move in a reciprocating motion in a cylinder block ( 18 ) and comprises a drive disc ( 11 ) which rotates with the drive shaft ( 8 ) and which drives the pistons ( 15 ). The aim of the invention is to obtain a delivery rate which is independent of rotational speed. To this end, the invention provides that the mass of the drive disc ( 11 ) is calculated such that the centrifugal forces generated when the drive disc ( 11 ) is rotating are large enough to counteract the pivoting movement of the drive disc ( 11 ) while actively regulating the same, and to influence the piston stroke and thus the delivery rate, especially to reduce or to limit the same.

1 . Axial piston motor ( 1 ), in particular compressor for the air conditioning system of an automobile, with a housing ( 2 ) and a compressor unit ( 6 ) arranged in the housing ( 2 ) and driven via a drive shaft ( 8 ) for taking in and compressing a refrigerant, the compressor ( 6 ) unit comprising pistons ( 15 ) axially reciprocating in a cylinder block ( 18 ) and a drive disk ( 11 ) driving the pistons ( 15 ) and corotating with the drive shaft ( 8 ), 
 characterized in that the rotating mass of the drive disk ( 11 ) or the pivotable part of the drive disk ( 11 ) is proportioned such that the centrifugal forces developing during the rotation of the drive disk ( 11 ) suffice to counteract the pivoting movement of the drive disk ( 11 ) in a purposely regulating manner and to influence therewith, in particular decrease or limit the piston stroke and thus the flow rate.    
     
     
         2 . Axial piston motor of  claim 1 , characterized in that the rotating mass of the drive disk ( 11 ) is proportioned such that the centrifugal forces developing during the rotation of the drive disk ( 11 ) and counteracting the pivoting movement of the drive disk ( 11 ) approximately compensate the forces exerted by the pistons ( 15 ) on the drive disk ( 11 ) and causing a more extensive pivoting movement of the drive disk ( 11 ).  
     
     
         3 . Axial piston motor of  claim 1 , characterized in that the rotating mass of the drive disk ( 11 ) is proportioned such that the centrifugal forces developing during the rotation of the drive disk ( 11 ) and counteracting the pivoting movement of the drive disk ( 11 ) are above the forces exerted by the pistons ( 15 ) on the drive disk ( 11 ) and causing a more extensive pivoting movement.  
     
     
         4 . Axial piston motor of  claim 3 , characterized in that the rotating mass of the drive disk ( 11 ) is proportioned such that the centrifugal forces developing during the rotation of the drive disk ( 11 ) and counteracting the pivoting movement of the drive disk ( 11 ) are above the forces exerted by the pistons ( 15 ) on the drive disk ( 11 ) and causing a more extensive pivoting movement, so that the piston stroke decreases as the rotational speed increases by such an extent that a constant flow rate adjusts itself.  
     
     
         5 . Axial piston motor of one of claims  1 - 4 , characterized in that the rotational mass of the drive disk ( 11 ) is greater than the sum of all translationally moved masses.  
     
     
         6 . Axial piston motor of  claim 5 , characterized in that the rotating mass of the drive disk ( 11 ) is about 10% to 60% above all translationally moved masses, in particular above the common mass of all pistons ( 15 ).  
     
     
         7 . Axial piston motor of  claim 6 , characterized in that the mass of the drive disk ( 11 ) is about 30% to 60% above all translationally moved masses, in particular above the common mass of all pistons ( 15 ).  
     
     
         8 . Axial piston motor of one of claims  1 - 7 , characterized in that the rotating drive disk is designed and constructed as a swash plate ( 11 ), and that a receiving disk ( 13 ) supported for corotation and in facing relationship with the swash plate ( 11 ) is arranged between the swash plate ( 11 ) and pistons ( 15 ).