TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - The damping unit(s) is protected in a housing, and the housing provides a non-engaged space. The damping unit(s) is not engaged within a limited range of relative motion of the members. The damping unit(s) is a hollow cylinder provided with bellows in side walls.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The damping unit(s) is made of an elastomeric material chosen from copolyetherester or copolyesterester with multiple long-chain ester units and short-chain ester units joined head to-tail through ester linkages, thermoplastic polyurethane consisting of a linear segmented block copolymer, thermoplastic polyamide block copolymers consisting of linear saturated aliphatic polyamide segments and flexible polyether or polyester soft segment with both ether and ester linkages, thermoplastic vulcanizate, thermoplastic polyolefinic elastomer or styrenic thermoplastic elastomer (TPS). The linear segmented block copolymer comprises a hard segment comprising diisocyanate and a short chain glycol, and a soft segment comprising another diisocyanate and a long chain polyol. The long-chain ester units are of formula: (-OGO-C(=O)RC(=O)-) (A), and the short-chain ester units are of formula: (-OD1O-C(=O)RC(=O)-) (B). The thermoplastic polyurethane is of formula: (X-O-C(=O)-NH-Y1-NH-C(=O)-O-Z) (C1). The thermoplastic polyamide block copolymers are of formula (HO-(C(=O)-PA-C(=O)-O-PE-O)n-H) (D2).G=divalent radical remaining after the removal of terminal hydroxyl groups from poly(alkylene oxide)glycols;R=divalent radical remaining after removal of carboxyl groups from a dicarboxylic acid;D1=divalent radical remaining after removal of hydroxyl groups from a diol;X=hard segment comprising diisocyanate and short-chain glycol;Z=soft segment comprising another diisocyanate and long-chain polyol;andY1=residual group of diisocyanate compound of urethane bond linking the X and Z segments;PA=linear saturated aliphatic polyamide sequence;andPE=polyoxyalkylene sequence formed from a moiety chosen from linear aliphatic polyoxyalkylene glycols with ether linkages, polyoxyalkylene glycols with ester linkages, polyoxyalkylene glycols with ether and ester linkages, branched polyoxyalkylene glycols with ether linkages, branched polyoxyalkylene glycols with ester linkages, branched polyoxyalkylene glycols with ether and ester linkages, long-chain polyol with ether linkages, long-chain polyol with ester linkages, long-chain polyol with ether and ester linkages, and/or their copolyethers and copolyesters.Preferred Property: The elastomeric material is a thermoplastic material with an elongation at break higher than 15% between -20 degrees C and +60 degrees C, tensile stress of 5-100 MPa, and tensile modulus of elasticity below 20000 MPa measured according to ISO 527-11-2. The poly(alkylene oxide)glycols has a number average molecular weight of 400-6000. The dicarboxylic acid has a molecular weight of less than 300. The diol has a molecular weight of less than 250. The copolyetherester(s) contain 15-99 weight% of short-chain ester units and 1-85 weight% of long-chain ester units.