Valve stem seal
AssigneeAktiebolaget Skf
InventorsChristoph Passow, Hans-Dieter Zander
Life of this patent
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Abstract
A valve stem seal includes an elastomeric annular seal body including a first seal body section and a second seal body section. The first seal body section includes a first seal lip configured to sealingly abut against the valve stem to delimit an oil space and a second seal lip axially spaced from the first seal lip and configured to sealingly abut against the valve stem to delimit an air space. The first seal body section includes an annular channel in a radially inner wall between the first seal lip and the second seal lip that is spaced from the valve stem when the valve stem seal is mounted on the valve stem, and the surface of the channel includes an undercut configured to facilitate a deformation of the second seal lip toward the first seal lip.
Claims18
A valve stem seal for sealing a valve stem of an internal combustion engine, comprising:
- an elastomeric annular seal body including a first seal body section configured to seal against the valve stem and a second seal body section configured to seal against a valve stem guide, and
- a reinforcing element having a first portion radially surrounding the second seal body section and a second portion at least partially embedded in the first seal body section, the second portion including an end of the reinforcing element,
- wherein the first seal body section includes an annular end portion axially spaced from the reinforcing element,
- wherein the first seal body section includes a first seal lip configured to sealingly abut against the valve stem to delimit an oil space and a second seal lip axially spaced from the first seal lip and configured to sealingly abut against the valve stem to delimit an air space,
- wherein the first seal body section includes a radially inwardly facing annular channel axially between the first seal lip and the second seal lip, the first seal body section being configured such that a surface of the channel is spaced from the valve stem when the valve stem seal is mounted on the valve stem, and
- wherein the surface of the channel includes an undercut configured to facilitate a deformation of the second seal lip toward the first seal lip.
A valve stem seal for sealing a valve stem of an internal combustion engine, comprising:
- an elastomeric annular seal body including a first seal body section configured to seal against the valve stem and a second seal body section configured to seal against a valve stem guide, and
- a reinforcing element at least partially surrounding the annular seal body,
- wherein the first seal body section includes a first seal lip configured to sealingly abut against the valve stem to delimit an oil space and a second seal lip axially spaced from the first seal lip and configured to sealingly abut against the valve stem to delimit an air space,
- wherein the first seal body section includes a radially inwardly facing annular channel axially between the first seal lip and the second seal lip, the first seal body section being configured such that a surface of the channel is spaced from the valve stem when the valve stem seal is mounted on the valve stem,
- wherein the surface of the channel includes an undercut configured to facilitate a deformation of the second seal lip toward the first seal lip,
- wherein the reinforcing element includes a first portion radially surrounding an outer surface of the second seal body section and a second portion embedded in the first seal body section, and
- wherein the second portion includes a radially inwardly angled end portion radially adjacent to the channel.
Dependencies are inferred from the claim text.