| 摘要 |
A pneumatic cylinder comprising a cylinder tube (1), a piston (3) sliding within the cylinder tube (1), at least one piston packing ring (13a;13b) disposed on the outer peripheral surface of the piston (3) for defining at least one pressure chamber (6a;6b), at least one port (5a;5b) for supplying and discharging compressed air to and from said pressure chamber (6a;6b) separated by the piston (3), a respective air outlet (7a;7b) for communicating with the pressure chamber (6a;6b) associated with a port (5a;5b) and positioned with an axial cushioning distance (X) to the end of the cylinder tube (1), cushioning means for stopping the piston (3) in a cushioning manner by restraining the discharged air flow from the pressure chamber (6a;6b), wherein said cushioning means comprise at least one piston channel (9a;9b) with a cushioning nozzle (8a;8b) arranged in the piston (3) in order to discharge compressed air within the pressure chamber (6a;6b) only through the cushioning nozzle (8a;8b) when the piston packing ring (13a;13b) passes over the air outlet (7a;7b) on the discharge side just before the piston (3) reaches the end of its stroke, wherein furthermore the piston channel (9a;9b) connects the pressure chamber (6a;6b) with the air outlet (7a;7b). <IMAGE>
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