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Noise measuring device for a differential gear assembly

  • US 5,728,938 A
  • Filed: 08/21/1996
  • Issued: 03/17/1998
  • Est. Priority Date: 07/26/1996
  • Status: Expired due to Fees
First Claim
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1. A noise measuring device for a differential gear assembly which generates a noise under simulated driving conditions, comprisinga fixed jig for fixing front and rear parts of the differential gear assembly having a differential gear;

  • a driving motor for rotating a drive shaft of said differential gear;

    a torque sensor and a revolutions per minute (RPM) sensor attached between said drive shaft and said driving motor;

    a computer displaying torque and RPM of said drive shaft after receiving through an analog-to-digital (A/D) converter signals from said torque sensor and said RPM sensor;

    an analog-to-digital (A/D) converter, connected to said torque sensor and RPM sensor, for conveying a signal to said computer representative of torque and RPM;

    braking means for providing a load to a driven shaft of said differential gear;

    a sound sensing means installed adjacent said differential gear for generating an electrical signal proportional to a magnitude of said noise; and

    a frequency analyzer which receives an output signal from said sound sensing means to analyze a characteristic of sound from said sound sensing means;

    wherein said braking means includes a brake drum coupled with said drive shaft as one body;

    a brake lining for covering a peripheral surface of said brake drum; and

    a brake controller which provides a load to said differential gear by imparting a tensile stress to said brake lining.

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