The double-envelope toroidal worm drive is a new type of worm drive. The worm tooth surface is the enveloping surface of the close surface of the space curve. It uses a plane as the mother surface, and the double-envelope reducer wraps according to a certain relative motion law The worm gear tooth surface uses the above-mentioned plane to envelop the worm tooth surface as the mother surface, and the envelope surface formed by another enveloping motion is formed by a hob that is theoretically consistent or similar to the worm of
The plane double-enveloped toroidal worm drive is a new type of worm drive. The worm tooth surface is the enveloping surface of the close surface of the space curve. It is formed by using a plane as the mother surface and enveloping it according to a certain law of relative motion. The worm gear tooth surface uses the above-mentioned plane envelope worm tooth surface as the mother surface, and the envelope surface formed by another envelope motion is formed by a hob that is theoretically consistent or similar to the worm. This The transmission pair requires two enveloping motions, so it is called "planar double enveloping toroidal worm drive".
The formation process of the plane double-envelope toroidal worm pair mainly includes two enveloping motions. The first enveloping motion takes the tooth surface of a flat-toothed worm wheel as the mother surface and the worm envelops the worm with a certain relative motion. Spiral tooth surface; the second enveloping motion takes the spiral surface formed by the first enveloping motion as the mother surface and the worm gear envelopes the worm gear tooth surface through conjugate motion.The kinematic pair formed in this way has the following characteristics during the meshing process:
1. The axial tooth profile of the worm is distributed in an arc shape, and the number of contacting teeth is 3-7 at the same time.
2. The tooth surface of the worm is precisely ground after hardening treatment. The hardness of the tooth surface is HRC≥50, and the roughness Ra≤0.8.
3. The machining process is completely consistent with the forming principle, which can reliably ensure the manufacturing accuracy and the theoretical state of meshing.
4. The tooth surface contact area is greater than 70%.