AGMA 92FTM9-1992 pdf download.Representative Form Accuracy of Gear Tooth Flanks on the Prediction of Vibration and Noise of Power Transmission by: Aizoh Kubo and Tetsuya Nonaka, Kyoto University Naoya Kato, Sony Corporation Shogo Kato and Toshio Ohmori, Toyota Motor Co. Ltd.
In order to check the quality of test gears on conjugate actin, the single flank rlling test of these gears was carried out. The set up of the test is ilustrated in Fig.2: An elecric motor 1 drives the test gears under no loading. Two precise rotary encoders 4 and 5 mounted on the driving and driven gear shafts respectively measure the rotational angle of each gear shaft and a processing unit 7 calculates the difference of the rotational angles. This signal is given to the FFT analyzer to obrain the Fourier specta of the single flank rllig test. One example of the Fourier specra measured is shown in Fig.3. The big amplitude in low frequency region is caused by the run out and the cumulative pitch deviation of the test gears. The frequency components acoding to involute eror is shown at the mesh frequency fz and
its twice 2fz.
Figure 4 shows the relation between the mesh frequency component of the measured gear noise and that of the single flank rlling tes. As the single fank rlling test was carried out under no loading and the noise measurement was crried out under several loading levels, the data for a gear pair is indicated by a vertical line in the figure. Concerming to the resuts on coasting tooth flanks ().l). we can find a rough positive crrlation between the results of single flank rlling test and the noise level, but the changing of the sound level of a gear pair due to the changing of tansmiting load is cnsiderably large. The result on the diving tth flank (n shows no crrelation. If we could carry out the measuement of loaded tasmissisn error i.c. single flank rllig test under loading, the correlation would become better. But it is not common and practical to carry out the measurement of loaded tansmission error. In the actual gear production industries today, the quality control for tooh flank acuaey of gears is mostly managed by the measurement of transverse tooh form and toth lead form. To refler the information of measured tansmission error to the production technology and to the quality control of gears, the relation between the factors in gear production enineering and the rasmissis eror of the gears manufactured must be clanfied, but it is not yet. On the other hand, when a definite indx can corelate the form acuracy of l flank with the rnning noise of gear drive unit it will work well in gear designing and quality control technique in today’s gear production. The relation between running noise of gear drive and the ransmission rr or vibraional exciation force of the gears which are calculated ass functions of the gear dimensions, acuraey of tooth flank form and driving condition is therefore investigated in the coming part of this investigation.
The form acuraey of profle and lead of four tth which are located at 90 degree itervals around each test gear were measured. From this result,the error surface for the accuracy of three dimensional tooth flank form is generated: the eor surface is defined on the plane of action by the dfference between actual tooth flank and the ideal involute helicoidll. The
transmission error of each gear pair can be simulated using the error surfaces for driving and driven gersl231. In actual gears there exists pich error and tooth flank form on each tooth of a gear is somewhat different. When we call the sum of the eror surfaces of driving and driven gears as “composite error surfaces”, the number of meshing tooth pair, i.e. the number of diferent composite error surfaces is therefore the least common multiple of the tooth number of driving gear and that of driven gear. That means, the simulation for the power transmiting state of this gear pair should be carried out for this serial existing state of composite error surfaces. But it takes too much time and money and is impractical. Moreover it is not yet known, how we could feed back the information data obtained by such a huge simulation to the actual gear production technology. The feasible method in practice is only the simulation for a gear pair that has a single figure of composice error surface which represents the quality of the gear pair.AGMA 92FTM9 pdf download.