Method and system for testing of individual gear teeth
OwnerGunter Laueinventor
Life of this patent
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Abstract
A previously charged capacitor is discharged through a coil having a core situated in the vicinity of the steel tooth. The discharge creates a surge of magnetic circulation whose attractive forces cause a bending of the steel tooth which then executes flexural vibrations. A sensor senses the flexural vibrations and furnishes an electrical signal whose amplitude and/or frequency characteristics are examined to detect defects in the tooth.
Claims17
System for testing the bending resistance and damping of an individual tooth of a steel gear for detecting defects therein, comprising, in combination, means for creating a pulsed magnetic attractive force for bending said tooth and causing said tooth to execute free flexural vibrations;
- and sensing means positioned in operative proximity to said tooth for sensing said flexural vibrations and furnishing an electrical signal having a predetermined characteristic varying in correspondence thereto, wherein said means for creating a pulsed magnetic attractive force comprise a capacitor, means for charging said capacitor to a predetermined voltage, a coil, and switch means interconnected between said capacitor and said coil for discharging said capacitor through said coil, thereby creating a surge of magnetic circulation in said coil.
A system as set forth in claim 16, further comprising a transformer interconnected between said capacitor and said coil, said transformer having a primary winding connected to said capacitor and said switch for receiving the discharge current of said capacitor, and a secondary winding connected to said coil.
System for testing the bending resistance and damping of an individual tooth of a steel gear for detecting defects therein, comprising, in combination, means for creating a pulsed magnetic attractive force for bending said tooth and causing said tooth to execute free flexural vibrations;
- and sensing means positioned in operative proximity to said tooth for sensing said flexural vibrations and furnishing an electrical signal having a predetermined characteristic varying in correspondence thereto, wherein said sensor means comprise a contactless sensor for sensing the deflection of said tooth from a reference position as a function of time and furnishing an electrical signal corresponding thereto.
System for testing the bending resistance and damping of an individual tooth of a steel gear for detecting defects therein, comprising, in combination, means for creating a pulsed magnetic attractive force for bending said tooth and causing said tooth to execute free flexural vibrations;
- and sensing means positioned in operative proximity to said tooth for sensing said flexural vibrations and furnishing an electrical signal having a predetermined characteristic varying in correspondence thereto, wherein said sensor means comprise a contactless sensor for sensing the deflection as a function of time of said tooth from a reference position and furnishing an electrical signal corresponding to the derivative thereof.
System for texting the bending resistance and damping of an individual tooth of a steel gear for detecting defects therein, comprising, in combination, means for creating a pulsed magnetic attractive force for bending said tooth and causing said tooth to execute free flexural vibrations;
- and sensing means positioned in operative proximity to said tooth for sensing said flexural vibrations and furnishing an electrical signal having a predetermined characteristic varying in correspondence thereto, wherein said gear has at least one tooth adjacent to said tooth under test;
- further comprising a yoke for carrying said coil, the core of said coil and said sensor means, said yoke having at least one conforming surface contacting a surface of said adjacent tooth during the testing of said tooth under test.
System for testing the bending resistance and damping of an individual tooth of a steel gear for detecting defects therein, comprising, in combination, means for creating a pulsed magnetic attractive force for bending said tooth and causing said tooth to execute free flexural bivations;
- and sensing means positioned in operative proximity to said tooth for sensing said flexural vibrations and furnishing an electrical signal having a predetermined characteristic varying in correspondence thereto, further comprising a source of electrical energy having a source frequency;
- and wherein said means for applying said switching signal to said electronic switch comprise means for furnishing said switching signal repeatedly at a frequency corresponding to said source frequency or an integral multiple or submultiple thereof.
System for testing the bending resistance and damping of an individual tooth of a steel gear for detecting defects therein, comprising, in combination, means for creating a pulsed magnetic attractive force for bending said tooth and causing said tooth to execute free flexural vibrations;
- and sensing means positioned in operative proximity to said tooth for sensing said flexural vibrations and furnishing an electrical signal having a predetermined characteristic varying in correspondence thereto, further comprising an oscilloscope having a time base generator for furnishing a deflection voltage varying as a linear function of time for a predetermined time interval following receipt of a trigger signal;
- wherein a decay time is associated with said flexural vibrations of said tooth;
- and wherein said predetermined time interval is less than approximately five times said decay time.
A method of testing the bending resistance and damping of an individual tooth of a steel gear in order to detect defects, comprising, in combination, the step of causing the tooth to perform free flexural vibrations of decaying amplitude by subjecting the tooth to shock excitation, the shock excitation being effected by applying to the tooth a single pulse of magnetic attractive force;
- and sensing the flexural vibrations and furnishing an electrical signal corresponding thereto.
A system for testing the bending resistance and damping of an individual tooth of a steel gear for detecting defects in the tooth, comprising, in combination, means for causing the tooth to perform free flexural vibrations for decaying amplitude by subjecting the tooth to a shock excitation effected by applying to the tooth a single pulse of magnetic attractive force;
- and sensing means positioned in operative proximity to the tooth for sensing the free flexural vibrations and furnishing an electrical signal having a predetermined characteristic varying in correspondence thereto.
Dependencies are inferred from the claim text.