Patent ID: 8591112
Filing Date: 2013-11-26
Classification: F16F

Abstract:
1. A guiding and sealing unit for a rod of a mono-tube shock absorber, the unit comprising: an annular rod guide bushing fixedly sealed to an inner lateral wall of a body of the mono-tube shock absorber, and wherein, the annular rod guide bushing extends through the rod and is engaged with the rod; a sealing assembly pressed into a cup-shaped seat formed on a first end of the bushing facing the inside of the shock absorber body, the sealing assembly comprising: a sealing ring made of an elastomeric material and having an annular sealing lip, which radially and axially protrudes within the cup-shaped seat to slidingly cooperate with the rod, and a metallic reinforcing structure having a flange-shaped portion abutting against the first end of the bushing, and a first sleeve-shaped portion that obliquely protrudes within the cup-shaped seat in a direction opposite to the direction in which the lip protrudes, and wherein, the first sleeve-shaped portion is embedded in the sealing ring so as to at least partially flank the lip on the side of a root portion of the lip, and wherein, the unit further includes a reinforcing ring snappingly mounted in an annular seat of the sealing ring provided on the side opposite to the direction of protrusion of the lip and wherein, the reinforcing ring is arranged axially locked against a bottom wall of the cup-shaped seat, packed between the bottom wall and a first flank of the root portion facing the bushing, and wherein, the reinforcing ring extends through the rod and engages the rod, and wherein, the reinforcing ring is made of low friction coefficient material, and wherein, the reinforcing ring is formed from a material that is more rigid than the elastomeric material of the sealing ring, and wherein, the reinforcing ring axially extends into the cup-shaped seat up to flank at least one terminal end of the first sleeve-shaped portion of the reinforcing structure, but on the side opposite thereto, and wherein a ring disposed between the bottom wall of the cup-shaped seat and the reinforcing ring is formed from a relatively rigid synthetic plastic material, and extends radially on substantially the entire extension of the bottom wall of the cup-shaped seat, and interposed between the latter and a terminal end of the sealing ring opposite to the lip and free from the reinforcing structure, arranged immediately adjacent to said terminal end of the sleeve-shaped portion of the reinforcing structure.