A seal assembly (1) is described to seal the gap (2) between a fixed member (3) and a rotating member (4) housed therein, to prevent the flow of oil from a first environment (5) to a second environment (6) of said gap (2); the seal assembly (1) is provided with a first ring (7) fitted to the rotating member (4), a second ring (8) fitted to the fixed member (3), elastically deformable sealing means (9) attached to the second ring (8) and comprising a first lip (21) that cooperates in a fluid-tight manner with a first mating portion (11) of the first ring (7), and a spiral groove (30) provided on the first lip (21) to generate, during the rotation of the rotating member (4), a fluid-dynamic pumping action to pump the oil from the sealing area to the first environment (5); the sealing means (9) also comprise a second lip (31) which can assume a configuration in which it forms a contact seal with a second mating portion (10) of the first ring (7) when the rotating member (4) is stopped, and a configuration in which it is detached from said second mating portion (10) during the rotation of the rotating member (4). ( Fig. 1 )
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