Carl Freudenberg Kg

Nok Corporation

Freudenberg-nok General Partnership

Mathias Burkert

Yoshiyuki Abe

Gonzalo Barillas

Edgar Freitag

Noriyuki Matsui

Joel T Johnson

Takeshi Wakana

Juergen Jaeckel

Martin Franz Goerres

Juergen Hieber

Benjamin E Westbrook

Jürgen Jäckel

Jürgen Hieber

A thermoplastic polyurethane is obtained via reaction of isocyanates (a) with a polyol component (b) having at least one polyesterdiol (b1), at least one polyetherdiol (b2) and at least one polycarbonatediol (b3), in each case with a molar mass of from 500 to 5000 g/mol, and also with at least one diol with a molar mass of from 62 to 500 g/mol. The thermoplastic polyurethane can be used for producing moldings, more particularly seals, coupling stars, valves, and profiles. The polyurethane has exceptional mechanical and chemical properties.

Thermoplastic polyurethane for seal applications

A seal system for a reciprocating cylinder includes a buffer seal, a rod seal, and a wiper seal. The buffer seal includes a dynamic seal lip and a static lip extending from a hinge portion. The hinge portion of the static lip allows fluid to escape past the outer diameter of the seal when the rod is retracted thereby releasing any pressure build-up between the rod seal and buffer seal. The axial face portion of the dynamic seal lip includes axially extending notches therein. The notches prevent the buffer seal from sticking to the axial wall of the groove and provide a consistent path for the fluid to energize the annular groove between the static and dynamic lips during the extension phase which is necessary for the function of the seal. The back-up ring is an integrated part of the buffer seal, used to provide superior extrusion resistance. The rod seal includes an annular seal body having a dynamic seal lip angularly extending radially inwardly and axially from the seal body, and a static lip angularly extending radially outwardly and axially from the seal body. An axial face portion of the dynamic seal lip and the static lip each include radially extending notches therein. The notches prevent the seal from sticking to the axial walls of the groove the rod seal is installed in and provides a consistent path for the fluid to energize the annular groove created by the static and dynamic lip during the extension phase. The back-up ring is an integrated part of the rod seal, used to provide superior extrusion resistance.

Wide range temperature and pressure hydraulic cylinder sealing system

Growing community of inventors

Schwalmstadt, Germany

Mathias Burkert