AGMA-92FTM9-1992.pdf
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1、92 FTM9 RepresentativeFormAccuracyof Gear ToothFlankson the Predictionof Vibrationand Noise of PowerTransmission by: Aizoh Kubo and Tetsuya Nonaka, Kyoto University Naoya Kato, Sony Corporation Shogo Kato and Toshio Ohmori, Toyota Motor Co. Ltd. AmericanGearManufacturersAssociation TECHNICALPAPER Co
2、pyright American Gear Manufacturers Association Provided by IHS under license with AGMA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 10:42:36 MDTNo reproduction or networking permitted without license from IHS -,-,- RepresentativeForm Accuracyof Gear Tooth Flanks o
3、n the Predictionof Vibrationand Noise of Power Transmission Aizoh Kuboand TetsuyaNonaka,Kyoto University Naoya Kato, Sony Corporation Shogo Kato and Toshio Ohmori, Toyota Motor Co., Ltd. Japan TheStatementsandopinionscontainedhereinarethoseoftheauthorandshouldnotbeconslruedasanofficial actionor opin
4、ion of the American Gear ManufacturersAssociation. ABSTRACT: Gear noise and vibration are troublesome problemsin power transmission systems. Recent research has shown that accuracy in three dimensionaltooth flank form, whichis usuallyrepresentedby toothform and tooth lead form, isan important factor
5、s in noise and vibration. In this paper theauthorsdiscuss investigationinto whatform accuracyof geartooth flank has agood correlationwith gear vibration and noise, when the scattering of accuracy in tooth flank form cannot be avoided. Copyright 1992 American Gear ManufacturersAssociation 1500 King S
6、treet, Suite201 Alexandria,Virginia,22314 October, 1992 ISBN:1-55589-589-1 Copyright American Gear Manufacturers Association Provided by IHS under license with AGMA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 10:42:36 MDTNo reproduction or networking permitted wit
7、hout license from IHS -,-,- RepresentativeForm Accuracyof Gear Tooth Flanks on the Predictionof Vibrationand Noise of PowerTransmission byAizohKUBOKyoto University TetsuyaNONAKAKyoto University NaoyaKATOSONYCorporation Shogo KATOToyota Motor Co,Ltd, Toshio OHMORIToyota Motor Co.Ltd,JAPAN 1.Introduct
8、ionIn this paper, we investigate what form accuracy of gear tooth flank has a good correlation with gear vibration and noise, when the scattering of Gear noiseand vibrationwhile runningare one of the mostaccuracy in tooth flank form cannot be avoided.This gives also an troublesome problem in power t
9、ransmission gears. It has become clear byinformationabout how much tolerancecan be allowedduringgear recent research that gear manufacturing accuracy, especially the accuracy inmanufacturing to realize silent gear drive unit. three dimensional tooth flank form which is usually represented by tooth f
10、ormandtooth lead form, is important factor for this problem. But actually,2.NoiseMeasurementofAutomotivePower even thoughwe investigate how we could expect the reduction of gear noiseTransmission and vibration according to the improvement of form accuracy of the gear tooth flank comparing previous f
11、orms, and gear dimensions and accuracy areTo investigategear noise of drive unit for automotivepower specifiedby this results of investigation and the gear manufacturingistransmission, 6 helical gear pairs (a,.f) whose tooth flank forms were ordered, there are many times that the prediction does not
12、 come true.different to each other were prepared.These gears were manufactured by a In most of these investigation to find the optimum tooth flank formprocess of bobbing, shaving and case hardening. Changing only this gear pair and the optimum gear dimensions, the tooth flank form is assumed to he I
13、 .Elecgric,_otor same on each tooth flank of a gear. But when we measure the form accuracy_2.To r qu em e,_s ur i ng of gear tooth flanks of actu_l gears from the production line, we find that theL_m3.Load lugd evice 4,Microphon formaccuracyis considerably differentbetweeneachtoothofa gear. Wecanm a
14、nticipate therefore one thing as the reason for the discrepancy between_IDRIVE GEAR_ predictions and the actual state, that we do nat consider the scattering of tooth flank acearacy on each tooth. When the target form aceuracy of tooth flank_ IRIV_GEt_q_I3_- and gear dimensions are predicted to obta
15、in quiet gears without considering_DRIVE PINIONGEAR the deviation of actual tooth flank form from the target form and without0UTQ_qL_PUTL._ considering the scattering of tooth flank form on each tooth of a gear, that target tooth flank form is in actual not the optimum form.This proposesDRIVESHAFT|_
16、RING GEAR i._._d also a big question what kind of accuracy in tooth flank form should be specified at gear designing and manufacturing to obtain a good result forFig.1Schema of the setup for noise measurement noisereduction,fromthe automotive gear box 1 Copyright American Gear Manufacturers Associat
17、ion Provided by IHS under license with AGMA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 10:42:36 MDTNo reproduction or networking permitted without license from IHS -,-,- in a gear drive unit, the gear noise was measured from 100 mm out side ofcomponents according
18、to involute erroris shown at the mesh frequency fz and the gear box and the mesh frequency component of the test gear pair in theits twice 2fz. noise was investigated, (Fig.l). The measurement was worked out under theFigure 4 shows the relation between the mesh frequency component of torque constant
19、 condition and increasing the driving speed gradually andthe measured gear noise and that of the single flank rolling test.As the continuously. The transmitting torque values for gears(a).(e) were 0.5, 1.0,single flank rolling test was cardedout under no loadingand the noise 2.0 kgf m ( i.e. 4.9, 9.
20、8, 19.6 Nm) on the coasting tooth flanks and for measurementwas carded out under several loading levels, the data for a gear gear(f) 2.0, 3.0, 6.0 kgf m ( i.e. 19.6, 29.4, 58.8 Nm) on the driving toothpair is indicated by a vertical line in the figure. Concerning to the results on flanks. The mesh f
21、requency component of gear noise was taken by using acoasting tooth flanks (a).(e), we can find a rough positive correlation trackingfilter. In all the measured results, the peak value was observed at betweenthe results of single flank rolling lest and the noise level, but the 2500 Hz mesh frequency
22、, in this gear drive unit, this peak value is considered changing of the sound level of a gear pair due to the changing of transmitting to be the most important on the noise problem. load is considerably large. The result on the driving tooth flank (f) shows no In order to check the quality of test
23、gears on conjugate action,the correlation.If we could carry out the measurementof loaded transmission single flank rolling test of these gears was carried out. The set up of the test error i.e., single flank rotlifig test under loading, the correlationwould is illustrated in Fig.2:An electric motor
24、1 drives the test gears under no become better. But it is not common and practicalto carry out the loading.Two precise rotary encoders 4 and 5 mounted on the driving and measurement of loaded transmission error.In the actual gear production driven gear shafts respectivelymeasure the rotational angle
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