Abstract: A shock absorber has dissipation power and practically no oil. The shock absorber comprising a rod-and-piston assembly slidable in a tubular body. The rod-and-piston assembly co-operating with the tubular body to define two working chambers containing hydraulic fluid. Each working chamber being in permanent communication with an auxiliary chamber containing a heterogeneous energy absorption-dissipation structure with at least one porous capillary matrix and an associated liquid relative to which the matrix is lyophobic. The two auxiliary chambers are annular chambers formed in the wall of the tubular body on either side of central portion of the tubular body. Each of the annular auxiliary chambers houses a flexible bag containing the associated heterogeneous structure; and each of the two working chambers also communicates with an associated compensation chamber. The compensation chambers ensures hydraulic fluid continuity during movements of the rod-and-piston assembly in the tubular body.

Abstract: A shock absorber has dissipation power and practically no oil. The shock absorber comprising a rod-and-piston assembly slidable in a tubular body. The rod-and-piston assembly co-operating with the tubular body to define two working chambers containing hydraulic fluid. Each working chamber being in permanent communication with an auxiliary chamber containing a heterogeneous energy absorption-dissipation structure with at least one porous capillary matrix and an associated liquid relative to which the matrix is lyophobic. The two auxiliary chambers are annular chambers formed in the wall of the tubular body on either side of central portion of the tubular body. Each of the annular auxiliary chambers houses a flexible bag containing the associated heterogeneous structure; and each of the two working chambers also communicates with an associated compensation chamber. The compensation chambers ensures hydraulic fluid continuity during movements of the rod-and-piston assembly in the tubular body.

Abstract: The invention relates to a shock absorber having high dissipating power and comprising a rod-and-piston assembly (12) slidably received in a cylinder (11) and defining on either side of the piston (13) respective working chambers (18; 19) containing hydraulic fluid. In the invention, each working chamber (18, 19) communicates continuously with an associated chamber (20, 21) containing a heterogeneous energy absorption-dissipation structure constituted by a capillo-porous matrix (51, 61) and an associated liquid (52, 62) relative to which the matrix is lyophobic. In addition, each working chamber (18, 19) communicates with a common compensation chamber (30) via an associated valve system (32, 33) including non-return means (40, 41) ensuring that the working chamber concerned closes automatically during compression, and opens during expansion.

Abstract: The invention relates to a shock absorber having high dissipating power and comprising a rod-and-piston assembly (12) slidably received in a cylinder (11) and defining on either side of the piston (13) respective working chambers (18; 19) containing hydraulic fluid. In the invention, each working chamber (18, 19) communicates continuously with an associated chamber (20, 21) containing a heterogeneous energy absorption-dissipation structure constituted by a capillo-porous matrix (51, 61) and an associated liquid (52, 62) relative to which the matrix is lyophobic. In addition, each working chamber (18, 19) communicates with a common compensation chamber (30) via an associated valve system (32, 33) including non-return means (40, 41) ensuring that the working chamber concerned closes automatically during compression, and opens during expansion.

Abstract: The invention relates to a heterogeneous structure for energy accumulation-dissipation (10), the structure being constituted by a porous capillary solid matrix (11) of open capillary porosity and of controlled topology, with capillary passages (12) of varying section and/or mutually interconnected to form labyrinths, and by a liquid (13) surrounding the porous capillary matrix and defining a liquid/solid separation surface, with the matrix (11) being lyophobic relative to said liquid. The area of the separation surface then varies isothermally and reversibly as a function of the external pressure to which the heterogeneous structure (10) is subjected.