Self-lubricating seal
AssigneeVEB Gummikombinat Berlin
InventorKurt Grorich
Life of this patent
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Abstract
A seal or packing engages a rotary machine part, e.g. a shaft, to be sealed off. Lubricant is drawn into the extended sealing area between the seal and the machine part and retained therebetween as a packing fluid, when the machine part rotates, regardless of the direction of rotation. Two or more sealing rings in tandem can be used as a self-lubricating packing ring or slide bearing.
Claims5
An assembly comprising a pair of relatively slidable members having juxtaposed surfaces, one of said surfaces being substantially smooth and the other of said surfaces being formed with an array of closely spaced geometrically similar projecting frustopyramids converging toward said one of said surfaces, said frustopyramids each having a relatively large rhombis base proximal to said other surface and a relatively small rhombic base geometrically similar to the respective large rhombic base and turned toward said one of said surfaces and diagonals parallel to the corresponding diagonals of the small rhombic bases of the other frustopyramids, each frustopyramid having a first edge perpendicular to its small base and a diagonally opposite second edge including an obtuse angle with its small base whereby said edges lie in a common plane perpendicular to the plane of the respective small base and intersecting same along its small diagonal, the first and second edges of all said frustopyramids being turned toward opposite sides of said other of said surfaces, said projecting frustopyramids lying at least two rows with the frustopyramids of the two rows being mutually staggered.
A ring for hydrodynamically sealing a rotary machine part, comprising an annular lip having an annular contact surface surrounding the axis of said part and juxtaposed with a surface of said part, said lip having a seal edge and another edge, said contact surface having with an array of facets formed by a multiplicity of oblique projecting frustopyramids, each said frustopyramid having a rhombic base with its long diagonal parallel to said edges and its short diagonal perpendicular thereto, and a smaller geometrically similar rhombic top surface for contact with said part, said frustopyramids being arranged side by side symmetrically with respect to an axial plane through the short diagonal of one of said rhombic surfaces, said rhombic surface of each frustopyramid being so located in relation to the respective rhombic base that an edge of each frustopyramid is substantially normal to the respective top surface and to the surface of said part, the opposite edge of the frustopyramid forming a wedge-shaped gap with said surface of said part, said projecting frustopyramids lying in at least two rows with the frustopyramids of the two rows being mutually staggered.
Dependencies are inferred from the claim text.