Abstract: A silencer for a leaf spring for a commercial vehicle is provided. The silencer includes an upper rubber body having defined therein a fitting hole into which a second leaf spring is press-fitted, with a top surface of the upper rubber body serving as a contact surface in contact with a first leaf spring, and a lower rubber body having defined therein an accommodation space, with a first buffering protrusion being provided on a bottom surface of the lower rubber body such that a third leaf spring is able to be in contact with the first buffering protrusion.

Abstract: Provided is a protective member for coil springs, including a tube main body that covers a coil spring of a suspension, wherein the tube main body is made of thermoplastic polyurethane that includes a prepolymer and a chain extender, wherein the prepolymer includes diisocyanate and a polyol, wherein a molar ratio of the diisocyanate to a sum of the polyol and the chain extender (diisocyanate/(polyol+chain extender)) is 1.025 to 1.040 and a molar ratio of the chain extender to the polyol (chain extender/polyol) is 6 to 3.8.