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Method for filtering rotational vibrations for motor vehicle

  • US 7,497,146 B2
  • Filed: 12/14/2007
  • Issued: 03/03/2009
  • Est. Priority Date: 05/04/2001
  • Status: Expired due to Term
First Claim
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1. A method for filtering out rotational vibrations transmitted by a drive shaft (11, 111) to an output shaft (19,119, 219);

  • the method comprising the steps of;

    providing a filtering device including a drive shaft damper (20, 120, 220) mounted to the output shaft (19) and an electromagnetic modulating device provided for matching a frequency of rotational vibration of the damper (20, 120, 220) to a frequency of rotational vibrations transmitted by the drive shaft (11, 111) which is inside the range of frequencies of the rotational vibrations to be damped out;

    measuring a frequency of a rotational vibration transmitted by the drive shaft (11, 111); and

    matching the frequency of the rotational vibration of the drive shaft damper (20, 120, 220) to the frequency of the rotational vibrations transmitted by the drive shaft (11,111).

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