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- W60657082 abstract "The simplest and cheapest way to achieve sealing between the chambers of a linear pneumatic actuator is to place sliding seals between surfaces in relative motion. Such seals, however, show the well-known stick-slip phenomenon, which significantly penalizes the pneumatic actuator when used in continuous positioning systems. One way of overcoming the problem is to use pneumatic cylinders with pneumostatic bearings instead of sliding seals [I], [2]. Though such a solution shows high performance, it is too expensive because of the very close tolerances required. This paper presents a proposal for solving the problem nore economically. The authors developed a cylinder whose piston is designed so that commercial-type seals can be installed in a non-conventional manner. One side of each seal faces the associated pressurized cylinder chamber, while the other side faces a volume maintained at atmospheric pressure. Sealing is guaranteed up to a certain pressure level, after which the seals yield rogressively, permitting a small controlled leakage. As' ressure increases, the friction forces thus drop until they ilrnost disappear, when contact between seals and barrel is ost. Experimental tests were carried out on a special rig using oth commercial-type and specially designed seals with ind without preload springs. Various materials were tested for the different seals. )erformance of the investigated solutions was evaluated experimentally by rheans of friction, wear and sealing ests. rests made it possible to develop satisfactory solutions, in articular using spring loaded seals. (*) Department of Energetics University of L'Aquila 67040 Roio Poggio L'Aquila (Italy)" @default.
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- W60657082 date "1995-01-01" @default.
- W60657082 modified "2023-09-24" @default.
- W60657082 title "A new low-friction pneumatic actuator" @default.
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