Pressure reducing cap for a liquid lubricant-filled wheel hub

  • US 5,551,530 A
  • Filed: 05/17/1995
  • Issued: 09/03/1996
  • Est. Priority Date: 05/17/1995
  • Status: Expired due to Term
First Claim
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1. A cap for retaining a liquid lubricant within a wheel hub, said cap comprising:

  • a hollow barrel having a forward opening, a rearward opening and a piston engagement surface forward of said rearward opening;

    a substantially rigid piston having a closed forward end sealed to fluid flow therethrough and a barrel engagement surface positioned within said barrel and slidably engaging said piston engagement surface;

    a substantially continuously forwardly enclosed interior cavity defined by said barrel and said piston, said interior cavity axially extending from said rearward opening to said forward end of said piston and maintaining substantially continuous fluid communication with said forward end, wherein said interior cavity has a variable fluid volume in response to the slidable position of said piston within said barrel;

    a non-grease liquid lubricant positioned within said variable fluid volume; and

    a substantially continuous seal positioned at said piston and barrel engagement surfaces, thereby preventing flow of said non-grease liquid lubricant between said piston and barrel engagement surfaces throughout slideable engagement of said piston and barrel engagement surfaces.

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