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US3790180A Expired / Lapsed US ⏱️ 0.0 years remaining

Fluid seal with pumping action

Assignee: Chicago Rawhide Manufacturing Co Inc
•
Filing: 1971-05-28
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Granted: 1974-02-05
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Expires: 1991-05-28
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Abstract

Abstract An oil or like fluid seal acting upon rotation of an associated element to pump oil lying on the associated element into the region being sealed. The described forms of seals include a primary lip and a plurality of individual, wedge-like pumping elements, with the elements having the working surfaces thereof lying substantially parallel to the associated element so as to overlie the element along a substantial portion thereof. The actual working surface comprises only a portion of the entire surface of the pumping element which is directed toward the associated element, with contact being formed along a large area of generally truncated eliptical pattern. The pumping element is formed so that the face thereof is flat, or of substantially different radius than the associated element, causing gradual radial convergence between a given portion of the associated element and the working face of the element as relative rotation occurs. In the preferred form, several of the pumping elements are radially spaced relative to one another and thereby adapted for successive operative engagement with the shaft or other element only after at least portions of the other elements have been worn in use. Accordingly, a succession of elements is inherently brought into working engagement with the movable element to provide continued pumping action throughout an extended life of the seal unit. The seals are made by a simple process using a mold core which is in turn manufactured by a simple method.

Inventors

  • 👤 W Heyn
  • 👤 G Peisker

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 18:29
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3244

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 247 words
A radially acting hydrodynamic oil seal assembly for use with an axially extending, relatively movable sealed member, said seal assembly including a seal body partially defined by first and second, generally frusto-conical seal body surfaces meeting each other along an annular area to form a primary seal band, and at least one pumping element formed on said first frusto-conical surface and extending radially and axially therefrom, the radially extending portion of said element consisting of a single surface having its leading edge portion, nose portion and trailing edge portions respectively formed by a single, generally curvilinear line, the nose portion of said line lying toward said seal band area and being spaced axially from said seal band area, the plane of said single surface being slightly inclined from the axis of said movable sealed member such that the portions of said single surface lying toward said nose portion are spaced farther radially from said movable sealed member than are the portions of said single surface lying farther from said nose portion, whereby said single surface forms an inclined circumferential chord across spaced apart portions of said seal body surface, and whereby, in the use of said seal, said sealed movable member will engage working surface portions of said single surface, said working surface forming on said movable member a contact pattern which includes a generally cuRvilinear margin with the nose thereof also lying in the direction of said seal band and being also spaced axially apart therefrom.
Claim 2
Dependent Claim 247 words
A radially acting hydrodynamic oil seal assembly for use with an axially extending, relatively movable sealed member, said seal assembly including a seal body partially defined by first and second, generally frusto-conical seal body surfaces meeting each other along an annular area to form a primary seal band, and at least one pumping element formed on said first frusto-conical surface and extending radially and axially therefrom, the radially extending portion of said element consisting of a single surface having its leading edge portion, nose portion and trailing edge portions respectively formed by a single, generally curvilinear line, the nose portion of said line lying toward said seal band area and being spaced axially from said seal band area, the plane of said single surface being slightly inclined from the axis of said movable sealed member such that the portions of said single surface lying toward said nose portion are spaced farther radially from said movable sealed member than are the portions of said single surface lying farther from said nose portion, whereby said single surface forms an inclined circumferential chord across spaced apart portions of said seal body surface, and whereby, in the use of said seal, said sealed movable member will engage working surface portions of said single surface, said working surface forming on said movable member a contact pattern which includes a generally cuRvilinear margin with the nose thereof also lying in the direction of said seal band and being also spaced axially apart therefrom.
Claim 3
Dependent Claim 18 words
An oil seal assembly as defined in claim 1 wherein a plurality of said pumping elements are provided.
Claim 4
Dependent Claim 17 words
An oil seal assembly as defined in claim 1 wherein said single surface is a flat surface.
Claim 5
Dependent Claim 39 words
An oil seal assembly as defined in claim 1 wherein said single surface is a surface of revolution of a straight line, the radius of curvature thereof being substantially greater than the radius of curvature of said annular area.
Claim 6
Dependent Claim 31 words
An oil seal assembly as defined in claim 1 wherein said pumping element is further defined by a rear surface portion extending substantially perpendicular to the axis of said sealed member.
Claim 7
Dependent Claim 56 words
An oil seal assembly as defined in claim 1 wherein a plurality of said pumping elements are provided and wherein said single surfaces on certain of said pumping elements are spaced radially from the center of said sealed member a different distance from the counterpart single surfaces on the other of said plurality of pumping elements.

References Cited (Backward Citations)

US3534969A Cited
DE1600458A1 Cited
SE306207B Cited
US3497225A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-02-04 1977-08-06 1978-02-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-02-04 1981-08-06 1982-02-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-02-04 1985-08-06 1986-02-05 $7700.00 Window Closed / Lapsed

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