Patent ID: 8596431
Filing Date: 2013-12-03
Classification: F15B

Abstract:
1. A pneumatic cylinder with a self-adjusting end position damping arrangement, comprising a cylinder housing ( 15 ) containing a movable cylinder piston ( 22 ) which divides the housing ( 15 ) into first and second variable-volume chambers ( 40 , 50 ), the first chamber ( 40 ) formed in part by a first side of the piston and which contains a piston fluid at a working pressure (p 1 ) which acts on the first side of the piston, and the second chamber ( 50 ) formed in part by an opposite second side of the piston and containing said end position damping arrangement in which a damping volume ( 19 ) which is delimited by the non-pressurized side of the cylinder piston ( 22 ) is formed in the region of the end position of the cylinder piston ( 22 ) as a result of the movement of the cylinder piston ( 22 ), said damping volume containing fluid at a damping pressure (P 2 ), wherein the end position damping arrangement comprises a stroke space ( 9 ) which is delimited by a movable stroke element ( 7 , 24 ) and a part of the pneumatic cylinder ( 1 ), with a connecting duct ( 14 ) which extends from the stroke space ( 9 ) to the first chamber ( 40 ) containing the fluid at working pressure (P 1 ) which acts on the cylinder piston ( 22 ) or to ventilation pressure (P 3 ) in an outlet duct ( 3 ), the stroke element ( 7 , 24 ), which is movable inside the stroke space, being acted on at a side facing toward the stroke space ( 9 ) by the working pressure (P 1 ) and on an opposite side being acted on by damping pressure (P 2 ) in the damping volume ( 19 ) via a damping duct ( 16 ), including a non-return valve ( 12 ) in the connecting duct ( 14 ) upstream of the stroke space ( 9 ), which non-return valve ( 12 ) blocks in the direction of the working pressure (P 1 ) or ventilation pressure (P 3 ), respectively, and encloses an air volume in the stroke space ( 9 ) and generates a gas spring effect caused by the movement of the stroke element ( 7 , 24 ) and including a ventilation duct ( 5 ) which can be opened by means of the movable stroke element ( 7 , 24 ) and which is connected to the outlet duct ( 3 ), whereas the stroke element ( 7 , 24 ) is controls the opening of the ventilation duct ( 5 ) depending on the damping pressure (P 2 ).