US4275889A — Seal construction

Claim 1

Independent Claim 77 words

In a seal including a stationary first part and a second part subjected to rotational torques, the improvement of a bellows comprising a fixed end secured to said first part and a movable end secured to said second part, a central section connecting said fixed and movable ends, said ends and said central section being generally annular, and a plurality of ribs formed on said central section and extending generally tangentially between said fixed and movable ends.

Claim 2

Dependent Claim 77 words

In a seal including a stationary first part and a second part subjected to rotational torques, the improvement of a bellows comprising a fixed end secured to said first part and a movable end secured to said second part, a central section connecting said fixed and movable ends, said ends and said central section being generally annular, and a plurality of ribs formed on said central section and extending generally tangentially between said fixed and movable ends.

Claim 3

Dependent Claim 34 words

Apparatus as in claim 1, wherein said fixed end has a larger diameter than said movable end, and said central section slants axially and radially outwardly from said movable end to said fixed end.

Claim 4

Dependent Claim 18 words

Apparatus as in claim 1, wherein said ribs are formed on the outer surface of said central section.

Claim 5

Dependent Claim 33 words

Apparatus as in claim 1, wherein said plurality of ribs comprises a first set of ribs extending tangentially in one direction and a second set of ribs extending tangentially in the other direction.

Claim 6

Dependent Claim 15 words

Apparatus as in claim 1, wherein the material of said bellows is a fluorinated elastomer.

Claim 7

Dependent Claim 24 words

Apparatus as in claim 1, wherein the material of said bellows is a peroxide cured copolymer of tetrafluoroethylene and propylene alternated in monomer sequence.

Claim 8

Dependent Claim 36 words

Apparatus as in claim 1, wherein said bellows is comprised of an inner layer and an outer layer, said outer layer consisting of a peroxide cured nitrile compound and said inner layer consisting of a fluoroelastomer.

Claim 9

Dependent Claim 38 words

Apparatus as in claim 1, wherein said seal further includes a member which rotates during operation of the seal, said second part engaging said member, said second part and said member being made of a hard silicon carbide.

Claim 10

Dependent Claim 96 words

A seal for an engine coolant pump, including a stationary first part and a second part which is subjected to rotational torques, the improvement of a bellows connecting said first and second parts, one side of said bellows being exposed to the coolant and the other side being exposed to air, said sides being resistant to said coolant and to oxidation respectively, said bellows comprising a first layer on said one side and a second layer on said other side, and said first layer comprising a peroxide cured nitrile, and said second layer comprisng a fluoroelastomer.

Claim 11

Dependent Claim 96 words

A seal for an engine coolant pump, including a stationary first part and a second part which is subjected to rotational torques, the improvement of a bellows connecting said first and second parts, one side of said bellows being exposed to the coolant and the other side being exposed to air, said sides being resistant to said coolant and to oxidation respectively, said bellows comprising a first layer on said one side and a second layer on said other side, and said first layer comprising a peroxide cured nitrile, and said second layer comprisng a fluoroelastomer.

Claim 12

Dependent Claim 14 words

Apparatus as in claim 9, wherein said second layer is a coating of fluoroelastomer.

Claim 13

Dependent Claim 87 words

In a seal including a stationary first part and a second part subjected to rotational torques, the improvement of a bellows comprising a fixed end secured to said first part and a movable end secured to said second part, a central section connecting said fixed and movable ends, said ends and said central section being generally annular, a plurality of ribs formed on said central section and extending generally tangentially between said fixed and movable ends, and said bellows being made of a peroxide cured nitrile compound.

Claim 14

Dependent Claim 87 words

In a seal including a stationary first part and a second part subjected to rotational torques, the improvement of a bellows comprising a fixed end secured to said first part and a movable end secured to said second part, a central section connecting said fixed and movable ends, said ends and said central section being generally annular, a plurality of ribs formed on said central section and extending generally tangentially between said fixed and movable ends, and said bellows being made of a peroxide cured nitrile compound.

Claim 15

Dependent Claim 159 words

Apparatus for a seal for an engine coolant pump, the seal making a sealed connection between a rotating shaft and a stationary member that encloses the shaft, the improvement of first and second annular seal members, said first seal member being fastened to said shaft and said second seal member being fastened to said stationary member and said members being subjected to rotational torques during operation of the engine, said first and second seal members being made of a relatively hard material having a low coefficient of friction and at least one of said members being made of silicon carbide, said annular seal members having engaging seal faces, and the radial width of said faces being relatively small to provide a continuous stable hydrodynamic film and reduced dynamic torque, a bellows connecting said second seal member to said stationary member, and an adhesive securing said bellows to said second seal member, said adhesive comprising a nitrile phenolic based material.

Claim 16

Dependent Claim 159 words

Apparatus for a seal for an engine coolant pump, the seal making a sealed connection between a rotating shaft and a stationary member that encloses the shaft, the improvement of first and second annular seal members, said first seal member being fastened to said shaft and said second seal member being fastened to said stationary member and said members being subjected to rotational torques during operation of the engine, said first and second seal members being made of a relatively hard material having a low coefficient of friction and at least one of said members being made of silicon carbide, said annular seal members having engaging seal faces, and the radial width of said faces being relatively small to provide a continuous stable hydrodynamic film and reduced dynamic torque, a bellows connecting said second seal member to said stationary member, and an adhesive securing said bellows to said second seal member, said adhesive comprising a nitrile phenolic based material.

Claim 17

Dependent Claim 17 words

Apparatus as in claim 12, wherein both of said annular seal members are made of silicon carbide.

Claim 18

Dependent Claim 23 words

Apparatus as in claim 12, wherein said radial width is preferably in the range of from approximately 0.045 inch to approximately 0.070 inch.

Claim 19

Dependent Claim 14 words

Apparatus as in claim 14, wherein said radial width is preferably approximately 0.065 inch.

Claim 20

Dependent Claim 24 words

Apparatus as in claim 14, wherein the outer diameter of said seal faces is approximately in the range between 1.215 inches and 1.225 inches.

Claim 21

Dependent Claim 28 words

Apparatus as in claim 12, and further comprising a rotatable part secured to the shaft, and a resilient boot connecting said first seal member to said rotatable part.

Claim 22

Dependent Claim 32 words

Apparatus as in claim 17, wherein said boot is secured to said rotatable part by a nitrile phenolic based adhesive and is secured to said first seal member by an epoxy adhesive.

Claim 23

Dependent Claim 32 words

Apparatus as in claim 17, wherein said boot comprises a rubber coating vulcanized onto said rotatable part, and said first seal member is secured to said rubber coating by an epoxy compound.

Claim 24

Dependent Claim 65 words

Apparatus as in claim 12 wherein said bellows includes a fixed end secured to said stationary member, a movable end secured to said second seal member, and a central section connecting said fixed and movable ends, said ends and said central section being generally annular, and a plurality of ribs formed on said central section and extending generally tangentially between said fixed and movable ends.

Claim 25

Dependent Claim 34 words

Apparatus as in claim 20, wherein said fixed end has a larger diameter than said movable end, and said central section slants axially and radially outwardly from said movable end to said fixed end.

Claim 26

Dependent Claim 18 words

Apparatus as in claim 20, wherein said ribs are formed on the outer surface of said central section.

Claim 27

Dependent Claim 33 words

Apparatus as in claim 20, wherein said plurality of ribs comprises a first set of ribs extending tangentially in one direction and a second set of ribs extending tangentially in the other direction.

Claim 28

Dependent Claim 15 words

Apparatus as in claim 12, wherein the material of said bellows is a fluorinated elastomer.

Claim 29

Dependent Claim 24 words

Apparatus as in claim 12, wherein the material of said bellows is a peroxide cured copolymer of tetrafluoroethylene and propylene alternated in monomer sequence.

Claim 30

Dependent Claim 36 words

Apparatus as in claim 12, wherein said bellows is comprised of an inner layer and an outer layer, said outer layer consisting of a peroxide cured nitrile compound and said inner layer consisting of a fluoroelastomer.

Claim 31

Dependent Claim 37 words

Apparatus as in claim 12, wherein one side of said bellows is exposed to the coolant and the other side is exposed to air during use, said sides being resistant to said coolant and to oxidation respectively.

Claim 32

Dependent Claim 26 words

Apparatus as in claim 17, wherein said bellows is comprised of a first layer on said one side and a second layer on said other side.

Claim 33

Dependent Claim 16 words

Apparatus as in claim 12, wherein said bellows is made of a peroxide cured nitrile compound.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1984-06-29	1984-12-29	1985-06-30	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1988-06-29	1988-12-29	1989-06-30	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1992-06-29	1992-12-29	1993-06-30	$7700.00	Window Closed / Lapsed

Seal construction

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