Hydraulic port fittings
AssigneeNWD International, Inc.
InventorNigel D. L. Williamson
Life of this patent
Estimating the term…
Abstract
The present invention relates to an improved hydraulic coupling which forms contact seals to fluidly connect a tapered port with a tube having a threaded connecting portion. The contact seals may be metal-to-metal seals, or alternatively may include a resin polymer element. For connecting a tube directly in the port, one embodiment of the invention includes an outwardly extending lip on an expanded portion of the tube and a tube nut rim wherein the tube nut engages the expanded portion and by tightening the tube nut, the tube lip deforms on the tapered port and the tube nut rim deforms on both the tapered port and the tube. Optionally, o-rings may be added to provide additional seals. The coupling may be designed not to seal without the application of tool generated torques.
Claims24
A hydraulic coupling comprising:
- a port including an opening, a portion defining a passageway in communication with said opening, an internally threaded portion in communication with said passageway, and a tapered surface facing said opening;
- a tube having a generally cylindrical body providing fluid communication to said port, said tube including a lip extending from said cylindrical body, an engagement portion, and a cylindrical portion extending between said lip and said engagement portion, said lip capable of deforming into sealing contact with said tapered surface of said port;
- and
- connector means for sealingly securing said tube to said port, said connector means including a rim which deforms into sealing contact with said tapered surface, said connector means including an externally threaded portion adapted to engage said internally threaded portion of said port and by threaded engagement force said lip and said rim into sealing contact with said tapered surface of said port, said connector means engaging said tube at said engagement portion which is axially displaced from said lip.
A hydraulic coupling comprising:
- a port including an opening, a portion defining a passageway in communication with said opening, an internally threaded portion in communication with said passageway, and a tapered surface facing said opening;
- conduit means for providing fluid communication to said port, said conduit means including a lip which deforms into sealing contact with said tapered surface of said port;
- and
- connector means for sealingly securing said conduit means to said port, said connector means including a rim which deforms into sealing contact with said tapered surface, said connector means including an externally threaded portion adapted to engage said internally threaded portion of said port and by threaded engagement force said lip and said rim into sealing contact with said tapered surface of said port, wherein said connector means includes threaded engagement means, a block, and a separate rim portion disposed about said conduit means, said block including a first opening for receiving said threaded engagement means, said block including a second opening for receiving said conduit means, and said block including a shoulder abutting said rim portion.
A hydraulic coupling for fluidly connecting a tube to a hydraulic device, said hydraulic coupling comprising:
- a port formed in the hydraulic device, said port including an opening, a portion defining a passageway in communication with said opening, an internally threaded portion in communication with said passageway, and a tapered surface facing said opening;
- a tube having a generally cylindrical body providing fluid communication to said port, said tube including an expanded portion around which is disposed a sealing ring, said body, and a transition portion connecting said expanded portion and said body;
- and
- connector means for sealingly securing said conduit means to said port, said connector means being disposed around said conduit means, and including a rim which deforms into sealing contact with said conduit means, said connector means including an externally threaded portion adapted to engage said internally threaded portion of said port, said connector means including a shoulder engaging said transition portion to urge said expanded portion into said opening and move said sealing ring into sealing contact with said tapered surface, and to force said rim into sealing contact with said port and with said conduit means by threaded engagement, said expanded portion of said tube being dimensioned to extend beyond said rim and locate said sealing ring axially disposed from said transition portion.
Dependencies are inferred from the claim text.