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Emphasis is placed on optimizing process technology. Regardless of whether the product's best process is grinding or grinding, it emphasizes the goal of reducing noise or reducing contact stress by optimizing process parameters. Hypoid Gear Noise Control Method In the experimental study of hypoid gear reduction, we comprehensively analyzed the above various viewpoints on quasi-hypoid gear noise reduction, combined with the actual production of the hypotonic gear through the noise reduction test. A better way to control the hypoid gear noise is obtained. "The method of heightening the tooth height of the hypoid gear with a tooth tip is only the form of noise reduction technology, not the essence. The essence is to provide an extra tooth height for the large tooth tip edge by raising the tooth height. Reducing or eliminating the noise of the bite (ie, the noise generated by the second harmonic) and keeping the actual meshing tooth height substantially the same as the standard meshing tooth height can be demonstrated by the following experimental studies.
When we developed the small liberation basin and the angle tooth grinding, we first grind the concave surface of the small wheel. When the small wheel concave surface is ground, record the contact area and noise feeling of the gear working surface. Then, the convex surface of the small wheel is ground. When the convex surface of the small wheel is ground, the contact area of ​​the gear working surface and the noise feeling are compared, and it is found that there is no difference between the two. It is the contact area of ​​the convex surface (working surface) of the basin for the development of small liberation basins and angle teeth. This proves from the test that the hyperid tooth height of the hypoid gear is a form of noise reduction, but the grinding wheel repaired by the dresser of the gear grinding machine can perform the small tooth root trimming (equivalent to the large gear tooth). The effect of the top trim edge), so there is no feeling of getting into the noise. However, since the working surface contact area of ​​the small liberation basin angle tooth is slightly short, there is a slight amount of fundamental wave noise.
The theory of this finding proves that the overlap coefficient in the direction of the tooth height accounts for a small proportion of the total overlap coefficient of the hypoid gear. "In the anti-hyperbolic gear noise reduction technology of the overlap direction of the tooth length direction, the overlap coefficient of the tooth length direction should be as large as possible, at least should exceed 456. In addition to the design problem, the gears exist for different products. The problem of optimal contact zone length, density, and the location of the contact zone corresponding to the length and width of the optimum contact zone. This finding also proves why Western developed countries do not develop the length of the contact zone, Width, position standard, but only discuss its principle. From the aspect of noise reduction of hypoid gears, the optimal contact zone length, width and position conditions are: the length of the contact zone should not cause the fundamental noise and secondary Harmonic noise; the width of the contact area should not cause the fundamental wave and the second harmonic noise, but the condition that the contact stress is not excessively large must also be considered; the position of the contact area should be biased from the small end, but The helix angle of the large wheel from the inner end to the outer end is constantly changing, so the contact area will correspond to a corresponding overlapping coefficient of the actual tooth length direction at different positions.
This view is demonstrated by the following experimental studies. We found in the contact area adjustment when grinding the pinion convex surface that the contact area of ​​the first trial grinding is as shown. It can be seen that the contact area is too long. However, it can be clearly felt on the inspection machine that there is no sign of any fundamental wave or second harmonic noise on the reverse surface at this time. Of course, this contact area will have second harmonic noise once it is under working load. Shorten the contact area and reduce the diameter of the small wheel convex grinding wheel:: After that, the contact area is as shown. For the contact area shown, the feeling of gear noise on the inspection machine is almost indistinguishable from the one shown, except that the "sand" and "sand" sounds are slightly larger. However, when the contact area shown is moved to the small end: there is a slight fundamental noise.
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