Torsional vibration damper

A torsional vibration damper, comprising:

• a) at least two mutually pivoted masses being mounted rotatably about an axis;
• and
• b) at least one friction device comprising a wedge having frictional surfaces and being actively disposed between said at least two mutually pivoted masses, said friction device being arranged in a chamber being partially filled with a viscous additive;
• wherein said friction device is rigid except for the intrinsic elasticity of said wedge and said frictional surfaces;
• wherein said at least one friction device comprises at least one wedge having at least one projection that points in an axial direction.

A torsional vibration damper, comprising:

• a) at least two mutually pivoted masses being mounted rotatably about an axis;
• and
• b) at least one friction device actively disposed between said at least two masses, said friction device being arranged in a chamber being partially filled with a viscous additive;
• wherein said friction device is to encompass no spring-elastic auxiliary device;
• wherein said at least one friction device comprises at least one wedge having at least one projection that points in an axial direction.

A torsional vibration damper, comprising:

• a) at least two mutually pivoted masses being mounted rotatably about an axis;
• and
• b) at least one friction device actively disposed between said at least two masses, said friction device being arranged in a chamber being partially filled with a viscous additive;
• wherein said friction device is to encompass no spring-elastic auxiliary device;
• wherein said friction device comprises at least one wedge and has projections with gaps being formed between said projections.

A torsional vibration damper, comprising:

• a) at least two mutually pivoted masses being mounted rotatably about an axis;
• and
• b) at least one friction device actively disposed between said at least two masses, said friction device being arranged in a chamber enveloping a wedge;
• said chamber having a cylindrical frictional surface against which said wedge abuts;
• and said chamber having at least two radial walls being in frictional contact with said wedge wherein said wedge comprises at least one projection pointing in an axial direction.

A torsional vibration damper, comprising:

• a) at least two mutually pivoted masses being mounted rotatably about an axis;
• and
• b) at least one friction device actively disposed between said at least two masses, said friction device being arranged in a chamber;
• said chamber being covered by a sheet at least on one axial side wherein said at least one friction device comprises at least one wedge having at least one projection that points in an axial direction.

A torsional vibration damper, comprising:

• at least two mutually pivoted masses comprising a primary mass and a secondary mass;
• at least one friction device actively disposed between said at least two mutually pivoted masses and including at least one entraining wedge having at least one projection that points in an axial direction;
• a sheet coupled to said primary mass and being fixed to said primary mass;
• a sheet coupled to said secondary mass and being fixed to said secondary mass;
• at least two frictional surfaces for frictionally coupling said at least two mutually pivoted masses together via said at least one friction device and wherein at least a first frictional surface of said at least two frictional surfaces is either directly or indirectly formed on said primary mass and wherein at least a second frictional surface of said at least two frictional surfaces is either directly or indirectly formed on said secondary mass wherein said first of said at least two is formed on said sheet coupled to said primary mass and said second frictional surface is formed on said sheet coupled to said secondary mass wherein said at least one entraining wedge is disposed between said at least two opposed frictional surfaces and is frictionally coupled to at least one of said at least two frictional surfaces,
• said entraining wedge comprising at least two wedge surfaces, with a first of said two wedge surfaces frictionally engaging said first frictional surface and a second frictional surface of said two wedge surfaces frictionally engaging said second frictional surface.

A torsional vibration damper, comprising:

• a) at least two mutually pivoted masses comprising a primary mass and a secondary mass;
• b) at least one friction device actively disposed between said at least two mutually pivoted masses and comprising a spring friction device linking said at least two mutually pivoted masses together wherein said at least one friction device comprises at least one wedge having at least one projection that points in an axial direction;
• and
• c) at least one additional frictional device including at least one entraining wedge disposed between said at least two mutually pivoted masses whereby said entraining wedge comprises two wedge surfaces being parallel to said rotational axis, a first of said two wedge surfaces being an inner surface and wherein said second of said two wedge surfaces being an outer surface whereby a distance between said two wedge surfaces varies;
• at least two friction surfaces, wherein said two wedge surfaces are in frictional contact with said at least two friction surfaces, whereby at least a first frictional surface of said at least two friction surfaces is either directly or indirectly formed on said primary mass and wherein at least a second friction surface of said at least two friction surfaces is either directly or indirectly formed on said secondary mass.

A torsion vibration damper comprising:

• a) at least two mutually pivoted masses being mounted rotatably about an axis;
• b) at least one frictional device actively disposed between said at least two mutually pivoted masses, and comprising a spring device linking said at least two mutually pivoted masses together wherein said at least one friction device comprises at least one wedge having at least one projection that points in an axial direction;
• c) at least one additional frictional device including at least one entraining wedge disposed between said at least two mutually pivoted masses, said entraining wedge comprising two wedge surfaces;
• and
• d) at least two frictional surfaces for frictionally coupling said at least two mutually pivoted masses together via said entraining wedge, whereby at least a first frictional surface of said at least two frictional surfaces is either directly or indirectly formed on said primary mass and in frictional contact with a first of said two wedge surfaces, and whereby at least a second frictional surface of said at least two frictional surfaces is either directly or indirectly formed on said secondary mass and in frictional contact with a second of said two wedge surfaces, wherein a distance between said two frictional surfaces varies circumferentially.