Patent ID: 9709122
Date: 2017-07-18
CPC Classifications: B60G,F16F

Claim:
1. A plunge roll-off piston assembly for a rolling-lobe flexible member of an air spring, the air spring defining a longitudinal axis and having an interior space, the roll-off piston assembly comprising: a roll-off piston made of plastic and defining a longitudinal axis; a tubular support having a predetermined length and being defined by an annular wall concentric with said longitudinal axis and having an upper end face; said tubular support being uninterrupted by openings therein over the entire length thereof; a stop buffer; a dished plate for accommodating said buffer therein; said dished plate having a flat base arranged on said end face of said annular wall of said tubular support so as to cause said flat base to overlap said annular wall radially inwardly toward said longitudinal axis and radially outwardly so as to position said buffer above and in a two-sided overlapment with respect to said end face of said annular wall of said tubular support; said tubular support being made of metal so as to have a significantly higher strength when compared to the plastic of said roll-off piston; said roll-off piston having an annular outer wall and an annular inner wall concentric with respect to said annular outer wall and said longitudinal axis; said inner wall having an inner wall surface defining a cylindrical opening extending along said longitudinal axis; said cylindrical opening being configured to be complementary to the shape of said tubular support; said tubular support being accommodated in said cylindrical opening so as to be connected to said roll-off piston in mutual surface-to-surface direct contact engagement in a form-fitting connection along the entire length of said tubular support; said roll-off piston being configured as a hollow roll-off piston including: a pot-shaped piston lower part having a base; a piston upper part configured as a cover and connected airtight to said piston lower part; said hollow roll-off piston having an interior space communicating with said interior space of said air spring; a first part of said cylindrical opening being configured as part of said piston upper part and extending toward said piston lower part; a second part of said cylindrical opening being configured as a part of said pot-shaped piston lower part and extending, starting from said base of said piston lower part, toward said piston upper part; and, said first and second parts of said cylindrical opening being mutually joined to define said cylindrical opening as a composite cylindrical opening accommodating said tubular support therein.