US4770283A — Friction ring for clutches or brakes, and a metho…

Claim 1

Independent Claim 150 words

A friction ring for use in clutches, brakes and synchronizing equipment, said friction ring consisting of an annular metallic element which has at least one cylindrical or conical face and an uneven lining of powdered friction material attached to at least one said cylindrical or conical face of said annular metallic element, said friction ring being formed by the steps of: (a) providing a flat metallic ring which has opposite planar surfaces, (b) spraying a layer of powdered friction material onto at least one of said opposite surfaces of said flat metallic ring, (c) sintering said at least one said layer of powdered friction material so that it becomes attached to the surface of said flat metallic ring on which it was sprayed, and (d) reshaping said flat metallic ring with said at least one sintered layer of powdered friction material so that it has a cylindrical or conical shape.

Claim 2

Dependent Claim 150 words

A friction ring for use in clutches, brakes and synchronizing equipment, said friction ring consisting of an annular metallic element which has at least one cylindrical or conical face and an uneven lining of powdered friction material attached to at least one said cylindrical or conical face of said annular metallic element, said friction ring being formed by the steps of: (a) providing a flat metallic ring which has opposite planar surfaces, (b) spraying a layer of powdered friction material onto at least one of said opposite surfaces of said flat metallic ring, (c) sintering said at least one said layer of powdered friction material so that it becomes attached to the surface of said flat metallic ring on which it was sprayed, and (d) reshaping said flat metallic ring with said at least one sintered layer of powdered friction material so that it has a cylindrical or conical shape.

Claim 3

Dependent Claim 28 words

A friction ring as defined in claim 1, including prior to step (d) the step of impressing groovings in at least one said layer of powdered friction material.

Claim 4

Dependent Claim 44 words

A friction ring as defined in claim 1, wherein said flat metallic ring provided in step (a) has an inner edge and an outer edge, and wherein at least one of said inner edge and said outer edge includes entrainment protuberances and notches therebetween.

Claim 5

Dependent Claim 25 words

A friction ring as defined in claim 1, including after step (d) the step (e) of welding entrainment protuberances to said reshaped flat metallic ring.

Claim 6

Dependent Claim 41 words

A friction ring as defined in claim 4, wherein said reshaped flat metallic ring defines a central axis, and wherein in step (e) said entrainment protuberances are welded to said reshaped flat metallic ring to extend axially with said central axis.

Claim 7

Dependent Claim 41 words

A friction ring as defined in claim 4, wherein said reshaped flat metallic ring defines a central axis, and wherein in step (e) said entrainment projections are welded to said reshaped flat metallic ring to extend transversely to said central axis.

Claim 8

Dependent Claim 17 words

A friction ring as defined in claim 4, wherein said entrainment means have no friction material thereon.

Claim 9

Dependent Claim 183 words

A friction ring for use in clutches, brakes and synchronizing equipment, said friction ring consisting of an annular metallic element which has at least one cylindrical or conical face and an uneven lining of powdered friction material attached to at least one said cylindrical or conical face of said annular metallic element, said friction ring being formed by the steps of (a) providing a flat metallic plate which has opposite planar surfaces, (b) spraying a layer of a powdered friction material onto at least one of said opposite planar surfaces of said flat metallic plate, (c) sintering said at least one layer of powdered friction material so that it becomes attached to the surface of said flat metallic plate on which it was sprayed, (d) cutting a strip out of said flat metallic plate with said at least one sintered layer of powdered friction material, said strip having opposite ends, (e) bending said strip such that the opposite ends thereof abut one another, thus providing a cylindrical or conical closed annular element, and (f) welding said abutting ends of said closed annular element.

Claim 10

Dependent Claim 183 words

A friction ring for use in clutches, brakes and synchronizing equipment, said friction ring consisting of an annular metallic element which has at least one cylindrical or conical face and an uneven lining of powdered friction material attached to at least one said cylindrical or conical face of said annular metallic element, said friction ring being formed by the steps of (a) providing a flat metallic plate which has opposite planar surfaces, (b) spraying a layer of a powdered friction material onto at least one of said opposite planar surfaces of said flat metallic plate, (c) sintering said at least one layer of powdered friction material so that it becomes attached to the surface of said flat metallic plate on which it was sprayed, (d) cutting a strip out of said flat metallic plate with said at least one sintered layer of powdered friction material, said strip having opposite ends, (e) bending said strip such that the opposite ends thereof abut one another, thus providing a cylindrical or conical closed annular element, and (f) welding said abutting ends of said closed annular element.

Claim 11

Dependent Claim 89 words

A friction ring for clutches or brakes, consisting of an annular metal element (1) with at least one cylindrical or conical friction surface (2) comprising a spray-sintered friction lining (3), characterized in that the friction lining (3) is directly sintered on to at least one cylindrical or conical friction surface (2) of the annular element (1) itself, the initially planar friction surface (2) being formed, after applying the spray-sintered friction lining (3), into cylindrical or conical shape by a non-cutting shaping process such as stamping, deep-drawing or the like.

Claim 12

Dependent Claim 89 words

A friction ring for clutches or brakes, consisting of an annular metal element (1) with at least one cylindrical or conical friction surface (2) comprising a spray-sintered friction lining (3), characterized in that the friction lining (3) is directly sintered on to at least one cylindrical or conical friction surface (2) of the annular element (1) itself, the initially planar friction surface (2) being formed, after applying the spray-sintered friction lining (3), into cylindrical or conical shape by a non-cutting shaping process such as stamping, deep-drawing or the like.

Claim 13

Independent Claim 99 words

A method of producing a friction ring which is useful in clutches, brakes and synchronizing equipment, said method comprising the steps of (a) providing a flat metallic ring having opposite planar surfaces and inner and outer peripheral edges, (b) spraying a layer of powdered friction material onto at least one of said planar surfaces of said flat metallic ring, (c) sintered said at least one said layer of powdered friction material, and (d) reshaping said flat metallic ring with said at least one sintered layer of powdered friction material thereon so that it has a cylindrical or conical shape.

Claim 14

Independent Claim 99 words

A method of producing a friction ring which is useful in clutches, brakes and synchronizing equipment, said method comprising the steps of (a) providing a flat metallic ring having opposite planar surfaces and inner and outer peripheral edges, (b) spraying a layer of powdered friction material onto at least one of said planar surfaces of said flat metallic ring, (c) sintered said at least one said layer of powdered friction material, and (d) reshaping said flat metallic ring with said at least one sintered layer of powdered friction material thereon so that it has a cylindrical or conical shape.

Claim 15

Dependent Claim 22 words

The method as defined in claim 10, wherein in step (a) said flat metallic ring is punched from a flat metallic plate.

Claim 16

Dependent Claim 31 words

The method as defined in claim 10, wherein in step (d) said flat metallic ring with sintered layer of powdered friction material thereon is stamped into a cylindrical or conical shape.

Claim 17

Dependent Claim 31 words

The method as defined in claim 10, wherein in step (d) said flat metallic ring with sintered layer of powdered friction material thereon is deep-drawn into a cylindrical or conical shape.

Claim 18

Dependent Claim 27 words

The method as defined in claim 10, including prior to step (d) a step of impressing groovings in at least one said layer of powdered friction material.

Claim 19

Dependent Claim 33 words

The method as defined in claim 10, wherein at least one of the inner and outer peripheral edges of the flat metallic ring provided in step (a) provides entrainment protuberances and notches therebetween.

Claim 20

Dependent Claim 34 words

The method as defined in claim 10, including after step (d) a step of welding entrainment protuberances to at least one of the inner and outer peripheral edges of the reshaped flat metallic ring.

Claim 21

Dependent Claim 26 words

The method as defined in claim 10, including after step (d) the steps of gauging and compacting said at least one sintered layer of friction material.

Claim 22

Independent Claim 122 words

A method of producing a friction ring which is useful in clutches, brakes and synchronizing equipment, said method comprising the steps of (a) providing a flat metallic plate having opposite planar surfaces, (b) spraying a layer of powdered friction material onto at least one of said planar surfaces of said flat metallic plate, (c) sintering said at least one layer of powdered friction material, (d) cutting a strip out of said flat metallic plate with said at least one sintered layer of powdered friction material, said strip having opposite ends, (e) bending said strip such that the opposite ends thereof abut one another, thus providing a cylindrical or conical closed annular element, and (f) welding said abutting ends of said annular element.

Claim 23

Independent Claim 122 words

A method of producing a friction ring which is useful in clutches, brakes and synchronizing equipment, said method comprising the steps of (a) providing a flat metallic plate having opposite planar surfaces, (b) spraying a layer of powdered friction material onto at least one of said planar surfaces of said flat metallic plate, (c) sintering said at least one layer of powdered friction material, (d) cutting a strip out of said flat metallic plate with said at least one sintered layer of powdered friction material, said strip having opposite ends, (e) bending said strip such that the opposite ends thereof abut one another, thus providing a cylindrical or conical closed annular element, and (f) welding said abutting ends of said annular element.

Claim 24

Dependent Claim 39 words

The method as defined in claim 18, wherein said annular element defines a central axis, and including after step (f) a step of welding entrainment projections to said annular element, such that they extend axially with said central axis.

Claim 25

Dependent Claim 39 words

The method as defined in claim 18, wherein said annular element defines a central axis, and including after step (f) a step of welding entrainment projections to said annular element, such that they extend transversely to said central axis.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1991-09-13	1992-03-14	1992-09-13	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1995-09-13	1996-03-14	1996-09-13	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1999-09-13	2000-03-14	2000-09-13	$7700.00	Window Closed / Lapsed

Friction ring for clutches or brakes, and a method and device for producing the friction ring

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