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US 9,284,863 B2Granted
Valve stem seal
AssigneeAktiebolaget Skf
InventorsJuergen Kurth, Juergen Netzer
Life of this patent
Estimating the term…
Abstract
A valve stem seal (1) seals a valve stem (4) that is reciprocally movable in an axial direction. The valve stem seal includes a base body (8) that is connectable with a valve stem guide (6). A first seal lip (10) is resiliently positioned relative to the base body via an elastic connection (16) and seals the valve stem relative to an oil chamber (24). A second seal lip (12) is spaced in the axial direction (2) from the first seal lip and seals the valve stem relative to a gas chamber. The second seal lip is also resiliently positioned relative to the base body via the elastic connection.
Claims20
A valve stem seal for sealing a valve stem that is movable in an axial direction, the valve stem seal comprising:
- a base body configured to be connected to a valve stem guide that receives and guides the valve stem,
- a first seal lip configured to seal the valve stem relative to an oil chamber such that the first seal lip is oil-tight,
- a second seal lip spaced in the axial direction from the first seal lip in the direction of the base body and configured to seal the valve stem relative to a gas chamber, wherein a first portion of the second seal lip that is configured to contact the valve stem has a radial cross section that is more rounded than a second portion of the first seal lip that is configured to contact the valve stem,
- an elastic connection resiliently connecting the first and second seal lips to the base body, wherein no material is interjected into the elastic connection of the valve stem seal between the base body and the second seal lip, and wherein a radial cross section of the elastic connection defines only a single concave section between the base body and the second seal lip, and
- a support element substantially surrounding the base body of the valve stem seal wherein one of the group of the base body and the combination of the base body and the elastic connection contacts the entire inner surface of the support element, an axial end of the support element proximate to the first seal lip and the second seal lip does not have a radially extending portion that protrudes into another part of the valve stem seal,
- the valve stem seal being configured to receive an elastic spring element radially therearound, the valve stem seal being configured to support the elastic spring element such that it is axially located between the first seal lip and the second seal lip.
3 more elements
A valve stem seal comprising:
- an annular base portion configured to be disposed around and fixedly connected with a seal seat of a stationary valve stem guide that guides reciprocal linear movement of a valve stem therein,
- an annular first seal lip configured to sealingly contact the valve stem around its entire circumference such that the first seal lip is oil-tight,
- an annular second seal lip spaced in an axial direction from the first seal lip in the direction of the base body and configured to sealingly contact the valve stem around its entire circumference, wherein a first portion of the second seal lip that is configured to contact the valve stem has a radial cross section that is more rounded than a second portion of the first seal lip that is configured to contact the valve stem,
- an annular elastic bridge resiliently connecting the first and second seal lips to the base body, the elastic bridge being configured to enable radial movement of the first and second seal lips so as to follow radial movements of the valve stem relative to the valve stem guide without breaking the sealing contact of the first and second seal lips with the valve stem, wherein no material is interjected into the annular elastic bridge of the valve stem seal between the base body and the second seal lip, and wherein a radial cross section of the annular elastic bridge defines only a single concave section between the base body and the second seal lip, and
- a support element substantially surrounding the base body of the valve stem seal wherein one of the group of the base body and the combination of the base body and the elastic bridge contacts the entire inner surface of the support element, an axial end of the support element proximate to the annular first seal lip and the annular second seal lip does not have a radially extending portion that protrudes into another part of the valve stem seal,
- the valve stem seal being configured to receive an elastic spring element radially therearound, the valve stem seal being configured to support the elastic spring element such that it is axially located between the first seal lip and the second seal lip.
3 more elements
Dependencies are inferred from the claim text.