Internal crankshaft vibration damper

Apparatus for damping impulse and vibration in a crankshaft having one or more counterweights comprising:

• a) an inertial means
• b) inserted in one or more bores in said counterweights,
• c) an energy absorbing means
• d) a holding means to hold the energy absorbing means operatively connected to the inertial means.

Apparatus for damping vibration and impulse in a crankshaft having one or more counterweights containing one or more bores, said apparatus integral to said counterweights, said apparatus comprising:

• (a) an inertial mass means;
• (b) energy absorbing means, said energy absorbing means surrounding said inertial mass means;
• (c) means to orient an inertial mass means in said off-center orientation within said bores;
• (d) retaining means for retaining said apparatus in said bores;
• and
• (e) cylindrical means, said cylindrical means surrounding said inertial mass means and said energy absorbing means.

A method of damping vibration and impulse in a crankshaft having one or more counterweights containing one or more bores, said method comprising the steps of:

• (a) placing an inertial mass means within each of said bores;
• (b) surrounding said inertial mass means with energy absorbing means;
• and
• (c) compressing said energy absorbing means between said inertial mass means and said counterweight in response to said vibration in said crankshaft.

A method for damping vibration and impulse in a crankshaft having one or more counterweights containing one or more bores, said method comprising the steps of:

• a) placing an inertial mass means within one or more of said bores;
• b) inserting between said inertial mass means and the interior of the bore an energy absorbing means;
• and
• c) compressing said energy absorbing means between said inertial mass means and said counterweight in response to said vibration in said crankshaft.

Apparatus for damping vibration and impulse in a crankshaft having one or more counterweights containing one or more bores, said apparatus being inserted in one or more of the bores, said apparatus comprising:

• a) an inertial mass means;
• b) means to orient and restrain said inertial mass means in an off-center orientation within said bores;
• and
• c) energy absorbing means, said energy absorber means separating the inertial mass means from the walls of the bore that can be contacted by the restrained inertial mass means.