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Double-acting hydraulic piston-and-cylinder device

  • US 4,854,428 A
  • Filed: 09/22/1988
  • Issued: 08/08/1989
  • Est. Priority Date: 09/22/1987
  • Status: Expired due to Term
First Claim
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1. A double-acting piston-and-cylinder hydraulic unit which comprises:

  • means for forming a cylinder;

    a piston axially shiftable in said cylinder and defining therein respective hydraulic-fluid-containing chambers on opposite sides of said piston;

    a piston rod connected to said piston and extending axially out of said cylinder;

    an elastically deformable boot surrounding said cylinder and said rod while forming therewith a hydraulic-fluid-pressurized variable-volume compartment, said boot having a generally cylindrical segment sealingly connected to said cylinder, an outwardly widening segment diverging from and sealingly connected to said rod, and a transition segment connecting said widening segment to said generally cylindrical segment,said transition segment having, in an extended position of said piston rod, an outwardly convex shape and having a greater diameter than that of said generally cylindrical segment,a ratio between the radius (R) of said transition segment at said greater diameter than said generally cylindrical segment and an axial distance (L) between a plane of said transition segment at its greatest diameter and a location closest to said cylinder at which said boot is sealingly connected to said rod being given by the relation;

    
    
    space="preserve" listing-type="equation">3;

    1 ≧

    R/L ≧

    1;

    2; and

    means for fluid communication between each of said chambers and said variable-volume compartment.

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