Abstract: Torsional vibration dampers for FEADs are disclosed that include a hub having a sleeve defining a bore for receiving a shaft and an outer annular ring spaced radially outward from the sleeve, thereby defining an annular receptacle, a component for rotation with the hub having an inner annular ring disposed between the sleeve and the outer annular ring of the hub, and an annular cartridge seated in the annular receptacle between the inner annular ring of the component for rotation with the hub and the sleeve or outer annular ring of the hub. The annular cartridge defines a first annular groove having a generally C-shaped or U-shaped cross-sectional profile open radially outward, and has a first elastomer member seated therein in compression, thereby operatively coupling the component for rotation with the hub to the hub. The component may be a pulley body or an inertia member.

Abstract: Two-part hubs for torsional vibration dampers are disclosed that have a main body made of a softer material than a seal nose and do not require a welded joint to join them together. The main body has a plate defining a front face and a back face, an annular core extending axially outward from the back face of the plate and defining an innermost, outer radial surface and a first bore through the main body, and an outermost, radial, elastomer-receiving surface spaced apart from the innermost outer radial surface by the plate. The seal nose is mated to the innermost, outer radial surface of the annular core and mechanically engaged with the main body for rotation together. Torsional vibration dampers that include the two-part hubs are also disclosed, as well as a front end accessory drive including the same, and methods of manufacturing the two-part hubs.

Abstract: Torsional vibration dampers are disclosed that include a hub and an inertia member disposed concentric with and spaced radially outward or radially inward from the hub that together define a plurality of pockets therebetween each having a spool-shaped receptacle. A plurality of spool-shaped elastomeric plugs, one each, are seated in the spool-shaped receptacles. When the inertia member is spaced radially outward of the hub, the hub is mountable on a shaft, and when the inertia member is spaced radially inward of the hub, the hub is mountable inside a shaft. Methods of making the torsional vibration dampers are also disclosed.

Abstract: A crankshaft damper-isolator that includes a hub having an outer radial surface and an outermost radial surface spaced radially outward from the outer radial surface and thereby defining an annular receptacle therebetween, a pulley body having a belt engaging portion radially-concentric about the hub and a face guard that terminates in a central bore seated about the outer radial surface of the hub, a damper assembly disposed between the outermost radial surface of the hub and belt engaging portion of the pulley body, a back plate fastened to the hub, a first elastomeric isolator member encapsulated and interlocked in compression between the annular receptacle of the hub and a front face of the face guard of the pulley body, and a second elastomeric isolator member encapsulated and interlocked in compression between the back plate and a back face of the face guard of the pulley body.

Abstract: A torsional vibration damper is disclosed. The torsional vibration damper comprises a first member having a radially outer surface that comprises a central concave section axially between convex sections and a second member having a radially inner surface that comprises a central convex section axially between concave sections and that opposes said radially outer surface. The radially outer surface and said radially inner surface are separated by a radial gap that defines a cross-sectional profile having an axial center and axial ends, and wherein said radial gap increases in thickness from said axial center to each said axial end of said cross-sectional profile. Alternatively, the first member may include a central convex section axially between concave sections and the second member may include a central concave section between convex section.

Abstract: Torsional vibration dampers having isolator members (crankshaft damper-isolators) are disclosed that include a hub defining an annular receptacle, a pulley body having a belt engaging surface, a damper assembly disposed between an outermost radial surface of the hub and the pulley body, an isolator member seated in the annular receptacle of the hub, and a slide bearing disposed between an outer radial surface of the hub and the sleeve of the pulley body. The isolator member is engaged with both the hub and the pulley body for rotation therewith when the hub and pulley body rotate at the same speed and when the hub rotates relative to the pulley body. The isolator member may be an elastomeric isolator or a torsion spring isolator. The slide bearing axially retains the pulley body to the hub and allows the pulley body to rotate relative to the hub.

Abstract: Radial vibration dampers (RVD's) press-fittable to a shaft and shaft systems incorporating RVD's are disclosed herein. The RVD's include a first inertia member and a second inertia member fixedly connected to one another to define an annular channel having a radially facing, open side and a spring damper material seated in the annular chamber and axially compressed between the two inertia members. The spring damper material has a compressible portion protruding from the radially facing, open side so that, when the compressible portion is compressed against a shaft, the spring damper material defines a gap between the shaft and the inertia members. The RVD may be press-fittable inside a hollow shaft or to the outside of a hollow or solid shaft. The RVD's disclosed herein have first vibration mode shapes that are radial in nature and decoupled from latter vibration modes.

Abstract: Torsional vibration dampers having a hub integral with a pulley body for rotation therewith and at least an annular first elastomeric member seated on the pulley body between the outer belt engaging surface and the hub and held thereagainst for rotation therewith by a first inertia ring connected to the pulley body are disclosed. The torsional vibration dampers may also include an annular second elastomeric member seated on the pulley body, on a side opposite the annular first elastomeric member, between the outer belt engaging surface and the hub and held thereagainst for rotation therewith by a second inertia ring connected to the pulley body or seated on the first inertia member, on a side opposite the first elastomeric member, between the first inertia member and a front end cap, where the front end cap compresses the second elastomeric member against the first inertia member.

Abstract: A Torsional Vibration Damper includes a hub, a ring, and a rubber member that is compression fitted between the outer surface of the hub and the inner surface of the ring. The cross-sectional profile of the outer surface of the hub and the inner surface of the ring after the assembly of the TVD consists of two concave or convex arcs with their radii such that the cross-sectional profile's gap increases from the center to the sides. This variation of the cross-sectional profile's gap reduces the principal-strain buildup in the rubber, thereby improving the life of the Torsional Vibration Damper. This design also facilitates proper assembly as the components are self aligning.

Abstract: A torsional vibration damper includes an inertia mass and a rotating shaft or hub with an elastomeric ring between the inertia mass and the rotating shaft or hub. A large portion of said elastomeric member is located in a channel located either in the inertia mass or in the hub. This allows one to achieve high contact pressure without creating a significant fatigue on the elastomeric member. This can be used with either a crankshaft damper or an internal or external drive shaft damper.

Abstract: Mating components that are mateable to another component to share the same axis of rotation, assemblies including the mating component mated to another component, and methods of mating them together are disclosed. The mating component includes a hub having an engaging portion defining an endless channel recessed therein. The endless channel has a surface that defines one or more trenches therein and an elastomeric band seated against that surface in an uncompressed state. The elastomeric band has an outermost dimension relative to the endless channel that is larger than the inner or outer dimension defined by the engaging portion of the hub and thereby defines an unchanneled portion of the elastomeric band, which has a volume that is equal to or less than the total volume of the one or more trenches.

Abstract: A Torsional Vibration Damper includes a hub, a ring, and a rubber member that is compression fitted between the outer surface of the hub and the inner surface of the ring. The cross-sectional profile of the outer surface of the hub and the inner surface of the ring after the assembly of the TVD consists of two concave or convex arcs with their radii such that the cross-sectional profile's gap increases from the center to the sides. This variation of the cross-sectional profile's gap reduces the principal-strain buildup in the rubber, thereby improving the life of the Torsional Vibration Damper. This design also facilitates proper assembly as the components are self aligning.

Abstract: A torsional vibration damper includes an inertia mass and a rotating shaft or hub with an elastomeric ring between the inertia mass and the rotating shaft or hub. A large portion of said elastomeric member is located in a channel located either in the inertia mass or in the hub. This allows one to achieve high contact pressure without creating a significant fatigue on the elastomeric member. This can be used with either a crankshaft damper or an internal or external drive shaft damper.

Abstract: A torsional vibration damper includes front and rear hub members with an inertia mass between the two hub members. Annular elastomeric rings are positioned between the front and rear hub members and the inertia mass holding the inertia mass. Fasteners extend through the front hub member, the inertia mass, and fixed to the rear hub member. A clearance between the fastener and the inertia mass allows relative motion to absorb torsional vibration.

Abstract: A torsional vibration damper includes an inertia mass and a rotating shaft or hub with an elastomeric ring between the inertia mass and the rotating shaft or hub. A large portion of said elastomeric member is located in a channel located either in the inertia mass or in the hub. This allows one to achieve high contact pressure without creating a significant fatigue on the elastomeric member. This can be used with either a crankshaft damper or an internal or external drive shaft damper.

Abstract: A torsional vibration damper includes a one-piece integral hub and annular inertia mass assembly. Between the hub and the inertia mass are intermediate rings connected integrally with the mass and the hub connected integral spokes. Elastomeric members are compression fitted within spaces formed between the hub and the mass.

Abstract: A torsional vibration damper includes a one-piece integral hub and annular inertia mass assembly. Between the hub and the inertia mass are intermediate rings connected integrally with the mass and the hub connected integral spokes. Elastomeric members are compression fitted within spaces formed between the hub and the mass. With this design, the damper can be formed from a polymeric material with an embedded annular weight.

Abstract: A torsional vibration damper having a hub carrying a radially projecting flange and an annular inertia mass defining an annular channel encompassing the radially projecting flange and an elastomeric member. An annular compression ring is attached to the opening of the annular channel to axially compress and extrude the elastomeric member to fill the annular channel around the radial flange within the inertia ring. Projections defining an intermittent annular inner rim of the inertia mass extend through openings between the spokes of the hub and cooperate with an annular outer rim of the inertia mass to retain the compression ring.

Abstract: A torsional vibration damper includes a one-piece integral hub and annular inertia mass assembly. Between the hub and the inertia mass are intermediate rings connected integrally with the mass and the hub connected integral spokes. Elastomeric members are compression fitted within spaces formed between the hub and the mass. With this design, the damper can be formed from a polymeric material with an embedded annular weight.

Abstract: A torsional vibration damper includes a one-piece integral hub and annular inertia mass assembly. Between the hub and the inertia mass are intermediate rings connected integrally with the mass and the hub connected integral spokes. Elastomeric members are compression fitted within spaces formed between the hub and the mass.