Damper system with a high performance plastic wiper seal
AssigneeFreudenberg-NOK General Partnership
InventorGonzalo BARILLAS
Life of this patent
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Abstract
A damper system includes a cylinder wall defining a cylindrical chamber and having an open end having an annular recess. A piston is reciprocatingly disposed in the cylinder and is connected to a piston rod that extends out of the open end of the cylinder. An annular wiper seal is mounted in the annular recess of the cylinder and engages the piston rod. The annular wiper seal is made from a thermoplastic material. The annular wiper seal has an S-shaped cross section with a wiper lip having a lip edge that engages the piston rod, wherein the wiper lip has a substantially constant thickness along a majority of its length from the lip edge to the second radially inwardly extending portion.
Claims9
A damper system, comprising:
- a cylinder wall defining a cylindrical chamber and having an open end having an annular recess and a retaining shoulder adjacent the annular recess;
- a piston reciprocatingly disposed in the cylindrical chamber and connected to a piston rod that extends out of the open end of the cylindrical chamber;
- an annular wiper seal mounted in the annular recess of the cylinder wall and engaging the piston rod, the annular wiper seal being made from a thermoplastic material and being self-retained against the retaining shoulder, the annular wiper seal having a mounting portion extending in a axial direction, a first radially inwardly extending portion extending radially inward from an end of the mounting portion, an intermediate portion extending axially from an inner end of the first radially extending portion in a same direction as the mounting portion extends from an outer end of the first radially extending portion, a second radially inwardly extending portion extending radially inward from an end of the intermediate portion opposite to the first radially inwardly extending portion attaches to the intermediate portion, and a wiper lip extending axially and radially inward from an inner end of the second radially inwardly extending portion, the wiper lip having at least one lip edge that engages the piston rod.
A damper system, comprising:
- a cylinder wall defining a cylindrical chamber and having an open end having an annular recess;
- a piston reciprocatingly disposed in the cylinder and connected to a piston rod that extends out of the open end of the cylinder;
- an annular wiper seal mounted in the annular recess of the cylinder and engaging the piston rod, the annular wiper seal being made from a thermoplastic material, the annular wiper seal having a mounting portion extending in a axial direction, a first radially inwardly extending portion extending radially inward from an end of the mounting portion, an intermediate portion extending axially from an inner end of the first radially extending portion in a same direction as the mounting portion extends from an outer end of the first radially extending portion, a second radially extending portion extending radially inward from an end of the intermediate portion opposite to the first radially inwardly extending portion attaches to the intermediate portion, and a wiper lip extending axially and radially inward from an inner end of the second radially inwardly extending portion, the wiper lip having at least one lip edge that engages the piston rod, wherein the wiper lip has a substantially constant thickness along a majority of its length from the lip edge to the second radially inwardly extending portion.
A damper system, comprising:
- a cylinder wall defining a cylindrical chamber and having an open end;
- a piston reciprocatingly disposed in the cylindrical chamber and connected to a piston rod that extends out of the open end of the cylinder;
- a seal mounted in the open end of the cylinder and including an outboard wiper seal lip and an inboard seal lip each engaging the piston rod, the seal including an intermediate body disposed between the outboard wiper seal lip and the inboard seal lip with the intermediate body engaging the cylinder and the piston rod, the outboard wiper seal lip, the inboard seal lip and the intermediate body each being integrally made from a thermoplastic material.
Dependencies are inferred from the claim text.