The absorption device comprises a cross member extending in a transverse direction, and at least one tubular absorption member (14) extending in a longitudinal direction (X) perpendicular to the transverse direction, between two ends of which a cooperates with the cross. It comprises, for each tubular element (14), a connecting member (24) between the crossmember and the tubular absorption element, comprising a plate (26) secured to the crossmember, and a guide portion (28), integral with the plate (26), housed in the tubular absorption element (14), and having means (30) for fixing to the tubular absorption element (14).
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