Abstract: A vacuum pump with a circular translation cycle includes a fixed body (100) having a fixed disk (114) which is provided on at least one of its sides with a spiral-shaped protuberance (123), a movable disk (131) opposite to the stationary disk (114) and having also at least one spiral-shaped protuberance (133) interleaved with the spiral protuberance (123) of the fixed disk (114) and having the same angular amplitude, a mechanism by means of which the moveable disk (131) is connected to the body (100) and supported thereby in order to control a circular translation motion of the moveable disk (131) with respect to body (100), a motor (120) for driving the moveable disk (131) through a pump shaft (140), and a pump having a limiter device for limiting the circular translation motion. The mechanism includes two bearings (182, 190) carried by the pump shaft (140), which is in a central position with respect to the fixed body (100).

Abstract: A vacuum pump with circular translation cycle comprises a stationary body (10) with a stationary disc (13, 14) that includes, at least on one side thereof, a spiral-shaped projection (23, 24, 25), a movable disc (30) facing the stationary one (13, 14) and also including at least one spiral-shaped projection (33, 34, 35) interleaved with the projection (23, 24, 25) of the stationary disc (13, 14) and with the same angular range, a mechanism connecting the movable disc (30) to the body (10) so that it is supported thereby and controlling the circular translational motion of the movable disc (30) in relation to the body (10), and actuating unit (20) for driving the movable disc (30) by a pump shaft (50) that is centrally located in relation to the stationary body (10), the mechanism comprising at least one bearing (47) supported by the pump shaft (50) . The pump also includes a device for limiting undesirable travel in the circular translation of the disc, the device being a metallic bellows (60).