Method and device for sealing different oil environments
AssigneeAktiebolaget Skf
InventorJürgen Kurth
Life of this patent
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Abstract
A method and device are provided for sealing a first oil environment, which is located on a first side of a movable piston guided in a hollow chamber, from a second oil environment, which is located on a second side of the piston. The piston can move back and forth in the hollow chamber between the two oil environments in the axial direction by a piston stroke length (d). Two annular seal elements are disposed around the movable piston so as to sealingly contact the inner circumferential wall of the hollow chamber. The annular seal elements are spaced from each other by at least a distance (D) in the axial direction that is greater than or equal to the piston stroke length (d).
Claims20
A device for sealing a first oil environment from a second oil environment, comprising:
- a hollow chamber,
- a piston configured to reciprocally move in the hollow chamber by a maximum stroke length in an axial direction, wherein the first oil environment is located on a first side of the piston and the second oil environment is located on a second side of the piston that is axially opposite of the first side of the piston,
- first and second annular seal elements disposed on the piston and sealingly contacting an inner circumferential wall of the hollow chamber, wherein the seal elements are spaced by at least a distance in the axial direction that is greater than or equal to the maximum stroke length, and
- a support element configured to support the seal elements, wherein the support element is disposed on the piston between the two seal elements and the seal elements are disposed on opposite axial ends of the support element.
A method for sealing a first oil environment, which is located on a first side of a movable piston guided in a hollow chamber, from a second oil environment, which is located on a second side of the piston, wherein the piston is reciprocally movable in the hollow chamber between the first and second oil environments in the axial direction by a maximum piston stroke length, the method comprising:
- disposing a first annular seal element associated with the first oil environment around the movable piston so as to sealingly contact an inner annular wall of the hollow chamber,
- disposing a second seal element associated with the second oil environment around the movable piston so as to sealingly contact the inner annular wall of the hollow chamber, wherein the first seal element is spaced from the second seal element in the axial direction by at least at a distance that is greater than or equal to the maximum piston stroke length, and
- disposing a support element on the piston between the two seal elements, wherein the seal elements are disposed on opposite axial ends of the support element, and wherein the support element is configured to support the seal elements.
A vehicle transmission, comprising:
- a roller bearing, and
- a device for sealing a first oil environment from a second oil environment, the device comprising:
- a hollow chamber,
- a piston fixedly connected to the roller bearing and configured to reciprocally move in the hollow chamber by a maximum stroke length in an axial direction, wherein a first oil environment is located on a first side of the piston and a second oil environment is located on a second side of the piston that is axially opposite of the first side of the piston, and
- first and second annular seal elements disposed on the piston and sealingly contacting an inner circumferential wall of the hollow chamber, wherein the seal elements are spaced by at least a distance in the axial direction that is greater than or equal to the maximum stroke length.
Dependencies are inferred from the claim text.