Double-piston compressor of a compressed air supply device

Abstract

A double-piston compressor of a compressed air supply device. The double-piston compressor includes a low pressure stage and a high pressure stage, each of the low pressure stage and the high pressure stage having a cylinder with a piston guided in an axially movable manner therein. A piston of the cylinder of the low pressure stage and a piston of the cylinder of the high pressure stage are drivingly connected to the drive shaft via a sliding block guide. Sliding block tracks of the sliding block guide are constructed and arranged such that, during operation of the double-piston compressor, a movement of the pistons follows a stroke curve that deviates from a regular sinusoidal stroke curve, which has an amplitude corresponding to an eccentricity of the drive element.

1 . A double-piston compressor of a compressed air supply device, comprising:
 a low pressure stage and a high pressure stage, each of the low pressure stage and the high pressure stage having a cylinder with a piston guided in an axially movable manner therein,   wherein the cylinder of the low pressure stage and the cylinder of the high pressure stage are arranged radially opposite with respect to an axis of rotation of a drive shaft,   wherein the piston of the cylinder of the low pressure stage and the piston of the cylinder of the high pressure stage are rigidly connected to one another by a piston rod,   wherein the piston of the cylinder of the low pressure stage and the piston of the cylinder of the high pressure stage are drivingly connected to the drive shaft via a sliding block guide,   wherein the sliding block guide has a recess which is arranged in the piston rod, is provided with two parallel sliding block tracks, and is aligned perpendicularly to the axis of rotation of the drive shaft,   wherein the sliding block guide has a drive element in engagement with the recess, arranged axially parallel with respect to the axis of rotation of the drive shaft, and secured on the drive shaft with an eccentricity,   wherein, the sliding block tracks of the sliding block guide are constructed and arranged such that, during operation of the double-piston compressor, a movement of the pistons follows a stroke curve that deviates from a regular sinusoidal stroke curve, which has an amplitude corresponding to the eccentricity of the drive element.   
     
     
         2 . The double-piston compressor as claimed in  claim 1 , wherein the sliding block tracks of the sliding block guide are arranged at an inclination in a direction of rotation of the drive shaft relative to a perpendicular on a longitudinal axis of the piston rod. 
     
     
         3 . The double-piston compressor as claimed in  claim 1 , wherein the sliding block tracks of the sliding block guide are arranged at an inclination in opposition to the a direction of rotation of the drive shaft relative to a perpendicular on the longitudinal axis of the piston rod. 
     
     
         4 . The double-piston compressor as claimed in  claim 2 , wherein an angle of inclination of the sliding block tracks relative to a perpendicular on a longitudinal axis of the piston rod is less than or equal to 45°. 
     
     
         5 . The double-piston compressor as claimed in  claim 1 , wherein at least one of the sliding block tracks of the sliding block guide has a circular-arc-shaped indentation in a central portion. 
     
     
         6 . The double-piston compressor as claimed in  claim 5 , wherein a radius and a depth of the circular-arc-shaped indentation of the at least one sliding block track are dimensioned such that a stroke height of the piston rod when the drive element passes through the indentation is kept constant. 
     
     
         7 . The double-piston compressor as claimed in  claim 1 , wherein the sliding block tracks of the sliding block guide are curved in a shape of a circular arc in a direction of one of the piston of the cylinder of the low pressure stage and the piston of the cylinder of the high pressure stages.