Lip Seal With Inversion Prevention Feature
a technology of inversion prevention and seals, which is applied in the direction of engine seals, mechanical devices, engine components, etc., can solve the problems of increasing torque and extenuating the problem of highly incompressible materials, and achieve the effects of improving shaft followability, reducing seal torque and increasing thickness
Inactive Publication Date: 2014-01-23
FREUDENBERG NOK GEN PARTNERSHIP
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- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The present invention is a seal designed to reduce seal torque, prevent bell mouthing, and improve shaft followability at low temperatures. The seal has an annular mounting portion and an axially extending portion with a conically shaped seal portion. The seal includes a radially inner face with grooves or ribs and a radially outer face with a special bead. The bead acts as an integral spring to control the gap between the seal and the shaft and counteracts the propensity of seal portion for “bell mouthing.” The axially extending portion of the seal provides an improvement in shaft followability due to its cylindrical shape with lower bending stiffness. The flexibility of the axially extending portion of the seal can be controlled by adjusting its length and wall thickness to match application requirements.
Problems solved by technology
Three major problems associated with seals designed to have substantial contact areas between the shaft and the lip of the seal are “bell mouth,” the shaft followability at low temperatures, and oil carbonization in the pumping grooves due to local temperature rise causing increased torque.
The problem is extenuated for highly incompressible materials, like rubber and PTFE.
Method used
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[0015]The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
[0016]With reference to FIG. 1, a dynamic seal 10, according to the principles of the present disclosure, will now be described. The dynamic seal 10 includes a mounting portion 12 which is designed to be engaged within a bore of an outer housing 14. It should be noted that the mounting portion 12 can take on many shapes and can include an insert 15 which can be made from metal or plastic or other rigid material and can have an “L” or other cross-sectional shape.
[0017]The dynamic seal 10 includes an axially extending barrel portion 16 extending from a radially inner end 12A of the mounting portion 12. The axially extending barrel portion 16 is preferably generally cylindrical in shape although other shapes, such as conical or a convoluted curve shape, can also be utilized. The dynamic seal 10 includes a radially extend...
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A dynamic shaft seal assembly is provided including a dynamic seal for engaging a rotary shaft. The dynamic seal includes a mounting portion that is mounted within a casing and has an axially extending barrel portion extending from a radially inner end of the mounting portion. The axially extending barrel portion terminates in a radially extending leg portion which extends inwardly from an end of the axially extending portion. A generally conically shaped seal portion extends from an end of the radially extending portion and the seal portion includes a radially inner face engaging the shaft and a radially outer face having a stiffening bead integrally formed thereon. The mounting portion defines a bumper spaced from the axially extending barrel portion by a gap distance that is designed to prevent the seal lip from inverting under sustained high pressure or pressure spikes.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a divisional of U.S. application Ser. No. 12 / 410,067, filed Mar. 24, 2009, the disclosure of which is incorporated herein by reference.FIELD[0002]The present invention relates to “lay-down” dynamic shaft seals, and more particularly, to a dynamic shaft seal design to reduce the seal's torque, propensity for bell mouthing, and for providing improved shaft followability and improved ability to withstand internal excessive pressure or vacuum. The “lay-down” seal for their function rely on hydrodynamic pumping features as opposed to “standard” or “point-contact” seals that rely primarily on the intrinsic ability of some elastomers to pump in properly designed seals.BACKGROUND AND SUMMARY[0003]Rotary shaft seals have been utilized in machinery, the automobile industry, as well as other industries. Three major problems associated with seals designed to have substantial contact areas between the shaft and the lip of the seal ...
Claims
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IPC IPC(8): F16J15/32
CPCF16J15/32F16J15/322F16J15/3244
InventorBERDICHEVSKY, ALEXANDERPAWL, RORY S.SCHEIB, PATRICK L.
OwnerFREUDENBERG NOK GEN PARTNERSHIP