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Sealing ring
| Details |
Inventors: Becker, Bernd; Forch, Hans; Helfrich, Adam; Jung, Gottfried;
Assignee: Firma Carl Freudenberg (Weinheim, DE)
Primary Examiner: Ward, Jr.; Robert S.
Assistant Examiner:
Attorney, Agent or Firm: Sprung, Felfe, Horn, Lynch & Kramer
A sealing ring comprises a reinforcing ring composed of thermoplastic material and has at least one annular groove therein and a lip ring concentrically nested in the reinforcing ring and having a circular bead for each annular groove. The circular bead has the same profile as the annular groove and is set therein. Each bead has a profile which in the projecting portion is enlarged in the manner of a wedge extending essentially radially outwardly and a nominal diameter on which each bead is disposed is smaller than the nominal diameter of the associated groove. |
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DETAILED DESCRIPTION The invention has as its object to modify a sealing ring of this type is such a way that it consists of fewer than three parts and can be produced in fewer than four operations.
In accordance with the invention, this object is accomplished by the structure of the present invention wherein the reinforcing ring and the lip ring are concentrically nested and that one or more beads extend essentially radially outwardly, their profile being enlarged in the projecting portion in the manner of a wedge, the nominal diameter on which the bead or beads are disposed being smaller than the nominal diameter of the associated grooves.
It has been found advantageous that the nominal diameter on which the bead or beads are disposed be at least about 0.
5% smaller than the diameter of the grooves.
Particularly advantageous is a difference in diameter of about 2%.
The bead or beads which extend essentially radially outwardly and whose projecting portions are enlarged in the manner of a wedge are in every case an integral part of the lip ring, made of an elastomeric material.
Both the bead and the retaining part therefore have pronounced elastic properties which in accordance with the invention are utilized to provide a static seal between the lip ring and the reinforcing ring.
It is surprising in this connection that even very low initial tensions will provide good sealing.
This good sealing action is due particularly to the wedgelike compression which the profile of the beads undergoes in the direction of the particular point of application of the force.
Due to the axial symmetry which underlies the construction of the sealing ring, perfectly balanced conditions prevail in this respect over the entire periphery.
In accordance with a particular design, two grooves in the reinforcing ring are associated with two beads on the lip ring, the beads and grooves being disposed in proximity to the opposed axial ends of the contact surfaces on both sides.
With this construction, an additional axial component is impressed on the radial initial tension/compression of the beads, which results in an additional anchoring and static sealing effect
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