Pneumatic cylinder with damping in the end position

Abstract

A pneumatic cylinder with damping in the end position, also comprising a housing in which at least one slide rod element is mounted with at least one sealing element, in such a way that said slide rod element is linearly displaceable. At least one damper sleeve or its bearing arrangement is associated with the slide rod element, said bearing arrangement engaging with front-end bearing elements in the end positions. According to the invention, the damper sleeve or its bearing arrangement has at least one indentation for damping the end position and for ventilation.

Patent claims  
     
         1 . Pneumatic cylinder with end position damping, having a housing ( 1 ) in which at least one push-rod element ( 3 ) with at least one sealing element ( 6 ) is mounted to be movable in a linear manner, at least one damper sleeve ( 5 ) being assigned to the push-rod element ( 3 ) and engaging, in the end positions, into end face bearing elements ( 2 . 1 ,  2 . 2 ), characterized in that, for end position damping and ventilation, the damper sleeve ( 5 ) or the bearing ( 13 ) thereof comprises at least one notch ( 8 ).  
     
     
         2 . Pneumatic cylinder according to  claim 1 , characterized in that the at least one notch ( 8 ) is provided in a shell surface ( 9 ) of the damper sleeve ( 5 ) or in the bearing ( 13 ) thereof.  
     
     
         3 . Pneumatic cylinder according to  claim 2 , characterized in that the at least one notch ( 8 ) is provided approximately axially to the damper sleeve ( 5 ) or approximately axially to the bearing ( 13 ) thereof in the shell surface ( 9 ).  
     
     
         4 . Pneumatic cylinder according to at least one of  claims 1  to  3 , characterized in that the at least one notch ( 8 ) is provided approximately parallel to the push-rod element ( 3 ) in the damper sleeve ( 5 ) or the bearing ( 13 ) thereof.  
     
     
         5 . Pneumatic cylinder according to at least one of  claims 1  to  4 , characterized in that the damper sleeve ( 5 ) is provided at one end with a phase ( 10 ) for engagement into at least one sealing element ( 6 ) of the bearing ( 13 ).  
     
     
         6 . Pneumatic cylinder according to at least one of  claims 1  to  5 , characterized in that the at least one notch ( 8 ) is provided at different depths (T) in the damper sleeve ( 5 ) or in the bearing ( 13 ) thereof.  
     
     
         7 . Pneumatic cylinder according to at least one of  claims 2  to  6 , characterized in that the notch ( 8 ), starting from the shell surface ( 9 ) of the damper sleeve ( 5 ) or the shell surface ( 9 ) of the bearing ( 13 ) thereof, is let into the latter at an angle (α) of approximately 1 to 3°, especially 1.7 to 2.0°.  
     
     
         8 . Pneumatic cylinder according to  claim 6  or  7 , characterized in that the depth (T) in the region of the phase ( 10 ) of the damper sleeve ( 5 ) or the bearing ( 13 ) thereof is maximal and the notch ( 8 ) extends at the other end from the end face of the damper sleeve ( 5 ) or the bearing ( 13 ) thereof precisely into the shell surface ( 9 ).  
     
     
         9 . Pneumatic cylinder according to at least one of  claims 2  to  8 , characterized in that the at least one notch ( 8 ) is provided to be linear and parallel to a longitudinal direction of the damper sleeve ( 5 ) or the bearing ( 13 ) thereof within the latter and/or extends diagonally over the shell surface ( 9 ) from a first end to a second end via the shell surface ( 9 ).  
     
     
         10 . Pneumatic cylinder according to at least one of  claims 1  to  9 , characterized in that the at least one notch ( 8 ) of the damper sleeve ( 5 ) or the bearing ( 13 ) thereof is configured to be triangular, rectangular or arched in cross section.  
     
     
         11 . Pneumatic cylinder according to at least one of  claims 1  to  10 , characterized in that the at least one notch ( 8 ) is configured to be triangular in cross section at an angle β of approximately 30 to 90°, especially 60°.  
     
     
         12 . Pneumatic cylinder with end position damping, having a housing ( 1 ) in which at least one push-rod element ( 3 ) with at least one sealing element ( 6 ) is mounted to be movable in a linear manner, at least one damper sleeve ( 5 ,  5 . 1 ) being assigned to the push-rod element ( 3 ) and engaging, in the end positions, into end face bearing elements ( 2 . 1 ,  2 . 2 ), characterized in that, for end position damping and ventilation, the damper sleeve ( 5 . 1 ) and/or the bearing ( 13 ) thereof comprises at least one recess ( 14 ) and/or bore ( 15 ).  
     
     
         13 . Pneumatic cylinder according to  claim 12 , characterized in that the recess ( 14 ) is provided axially in a shell surface ( 9 ) of the damper sleeve ( 5 . 1 ), into which at least one bore ( 15 ) engages radially.  
     
     
         14 . Pneumatic cylinder according to  claim 13 , characterized in that a diameter (D) of each bore ( 15 ) and/or recess ( 14 ) is variably selectable and a distance (A) between bores ( 15 ) which are respectively disposed axially adjacent to one another can be selected as desired.  
     
     
         15 . Pneumatic cylinder with end position damping, having a housing ( 1 ) in which at least one push-rod element ( 3 ) with at least one sealing element ( 6 ) is mounted to be movable in a linear manner, at least one damper sleeve ( 5 ) being assigned to the push-rod element ( 3 ) and engaging, in the end positions, into end face bearing elements ( 2 . 1 ,  2 . 2 ), characterized in that at least one overpressure valve ( 20 ) is assigned to the bearing element ( 2 . 1 ,  2 . 2 ).  
     
     
         16 . Pneumatic cylinder according to  claim 15 , characterized in that the overpressure valve ( 20 ) is connected via at least one overpressure duct ( 19 ) to a compression space ( 26 ).  
     
     
         17 . Pneumatic cylinder according to  claim 16 , characterized in that, if a pressure is exceeded in the compression space ( 26 ), air, gas or a medium passes via the overpressure duct ( 19 ) into the overpressure valve ( 20 ) and can be relieved via a bypass ( 25 ) into a cavity ( 17 ) or an environment.  
     
     
         18 . Pneumatic cylinder according to  claim 17 , characterized in that the bypass ( 25 ) from the overpressure valve ( 20 ) opens within a bearing ( 13 ) in a shell surface ( 9 ) of the bearing element ( 2 . 1 ,  2 . 2 ) or is guided into an environment.  
     
     
         19 . Pneumatic cylinder according to at least one of  claims 16  to  18 , characterized in that the overpressure duct ( 19 ) opens at the end face from one end surface ( 18 ) within the housing ( 1 ) into the compression space ( 26 ).  
     
     
         20 . Pneumatic cylinder according to at least one of  claims 16  to  19 , characterized in that the overpressure valve ( 20 ) comprises a valve element ( 21 ), especially a ball, which seals the overpressure duct ( 19 ) and/or the bypass ( 25 ) in the closed position, the ball ( 21 ) being subjected to pressure by means of at least one spring element ( 22 ), which is retained via a closure element ( 23 ) in a blind hole ( 24 ) of the bearing element ( 2 . 1 ,  2 . 2 ).  
     
     
         21 . Damper sleeve or bearing thereof, especially for push-rod elements ( 3 ) for pneumatic cylinders, characterized in that for end position damping and ventilation the damper sleeve comprises at least one notch ( 8 ) and/or recess ( 14 ) and/or bore ( 15 ).  
     
     
         22 . Damper sleeve or bearing thereof according to  claim 21 , characterized in that the at least one notch ( 8 ) is provided in a shell surface ( 9 ).  
     
     
         23 . Damper sleeve or bearing thereof according to  claim 22 , characterized in that the at least one notch ( 8 ) is provided extending in a longitudinal direction in the shell surface ( 9 ) parallel to the axis or diagonally.  
     
     
         24 . Damper sleeve or bearing thereof according to  claim 22  or  23 , characterized in that the at least one notch ( 8 ) is let in deeper into the shell surface ( 9 ) at one end than at the other end.  
     
     
         25 . Damper sleeve or bearing thereof according to at least one of  claims 22  to  24 , characterized in that the at least one notch ( 8 ) is configured deeper at one end in the region of an end face ( 11 ) and emerges at the other end in the region of an opposite end face ( 12 ) to make a transition into the shell surface ( 9 ).  
     
     
         26 . Damper sleeve or bearing thereof according to at least one of  claims 22  to  25 , characterized in that the at least one notch ( 8 ) is provided in the shell surface ( 9 ) to be triangular, rectangular or arched in cross section.  
     
     
         27 . Damper sleeve or bearing thereof according to at least one of  claims 22  to  26 , characterized in that the recess ( 14 ) is provided axially in the shell surface ( 9 ) and at least one radial bore ( 15 ) engages into the recess ( 14 ).  
     
     
         28 . Damper sleeve or bearing thereof according to  claim 27 , characterized in that the radial bores ( 15 ) are spaced from one another axially by a selectable distance (A), it being possible, if desired, to select a diameter (D) of each individual bore ( 15 ).