UA26131A - SHARIKOVA CHERVYACHHA TRANSMISSION RL HEMIROVSKY - Google Patents

Abstract

The invention relates to machine-building and can be used for transfer of rotation with reduction between crossing shafts in cases when it is necessary to transfer large torque at high efficiency and dynamical rigidity. A ball worm transmission has a worm, side surfaces of teeth of which in normal section are made in rectangular or concave profile.

Description

a gap is provided by the recesses of the worm wheel 2 (Fig. 2). In the version of the transmission with balls placed on the worm wheel 2 (fig. b), the screw grooves 9 are filled on the sides of the teeth 4 at the bottom of the depressions 6 (fig. 9). They also have accommodation! balls 10. The profile of the lateral sides of tooth 7 of worm 1 in the normal cross-section is filled with a straight line. The profile of the side sides 8 of the tooth 4 of the worm wheel 2 can be filled with an arc or a straight line (Fig. 10), with the ball 10 touching at one point. He can also hit arched (fig. 11) or prismatic (fig. 12) with the ball touching in two points.

The profile of the side surfaces of the tooth From the worm wheel 2 versions of the transmission with the balls placed on it can be filled with a second concave shape! with 10 balls touching in several points.

In continuation of the grooves 9 on the ends of the worm wheel, there are 2 fillings! grooves 15 and 16, connection by the return channel 17 (Fig. 7). The rim 18 is designed to prevent the balls 10 from falling out of the grooves 9 outside the engagement zone, and the covers 19 hold the balls in the grooves 15 and 16. Covers 19 supplies! projections 20 (fig. 8), which are located on both sides of the tooth 4 of the worm wheel 2 and enter the depressions 6 and depressions! 7 worm 1.

In the engagement zone, between the balls 10 and the groove 9 of the worm wheel 2, as well as between the ball 10 and the depressions 5 of the worm 1 (fig. 2), a gap is provided.

In the engagement zone, in both versions of the transmission, the contact of the balls 10 and the side surfaces 7 and 8 is provided with preliminary tension, for example, due to the selection of the thickness of the teeth

With and 4, as well as the diameter of the ball 10 (fig. 2 and 9).

The transmission works as follows.

In the version of the transmission, with balls 10 placed on the worm 1 (fig. 1 - 5), during the rotation of the worm 1, the balls 10 roll along the screw grooves 9. When approaching the engagement zone, the balls 10 engage the end of the tooth 4 of the worm wheel 2 slightly rise above the surface of the grooves 9 and come into contact with its side surfaces 8 and side surfaces 7 of the tooth

From the worm 1. Further prokatvayas along the side surfaces 7 and 8 of the teeth Z and 4, the balls 10 transmit the rotation from the worm 1 to the worm wheel 2. After exiting the zone! engagement, the balls 10 along the steps on the side surfaces 8 again fall to the surface of the screw grooves 9 and further roll along them. When meeting the stop 11, the balls 10 are sent to the return channel 12, from where, bypassing the similar stop 11, installed at the opposite end of the channel 12, they are sent to the place of the grooves 9, where their path began.

In the version of the transmission, with 2 balls 10 placed on the worm wheel (fig. b - 12), during the rotation of the worm 1, the balls 10 are placed in the grooves 9, 15 and 16, as well as in the channel 12 (fig. 7 and 8) , turn together with the worm wheel 2. When approaching the engagement zone from the side! the end of the worm 1, the balls 10 rise from the bottom of the groove 9 and due to contact with the side 7 of the tooth Z begin to move along the grooves 15, 16 and the channel 12. The direction of movement of the balls 10 depends on the direction of rotation of the worm 1 and the direction of the screw line of its teeth. Let us assume that the balls 10 fall into the engagement zone from the groove 15. At the same time, rising along the edges of the tooth 4 of the worm wheel 2, they come into contact with the side surfaces 8 of the tooth 4 and the side surfaces 7 of the tooth with the help of the protrusions 20 on the covers 19 From the worm 1. Further rolling along the side surfaces 7 and 8 of the teeth Z and 4 in the direction of the opposite end, the balls 10 transmit rotation from the worm 1 to the worm wheel 2. On the opposite end of the worm wheel. 2 along the steps on the side surfaces 8 of the tooth 4 with the help of protrusions 20 on the covers 19, the balls 10 are lowered into the groove 16 and, moving along it, fall into the channel 12. From the channel 12, the balls 10 again return to the groove to the place where they started their movement . This movement of the balls 10 continues until, at the opposite end of the worm 1, they go beyond the limit! ladies! engagement Leaving the engagement zones, the balls 10 sink to the bottom of the groove 9 and continue to rotate together with the worm wheel 2 without moving relative to it.

Due to the fact that in the version of the transmission with balls 10, placed on the worm 1, the profile of the side surfaces of the 7 teeth of the worm 1 is rectilinear or curved, and the profile of the side surfaces of the 8 teeth 4 of the worm wheel 2 is rectilinear, the pretension force in all variants of the profile is closed between the teeth Z and 4 of the worm 1 and the worm wheel 2. Similarly, in the version of the transmission with balls 10, placed on the worm wheel 2, because the profile of the side surfaces of the 8 teeth 4 of the worm wheel 2 is rectangular or concave, and the profile lateral surfaces 7 of worm 1 are filled in a straight line, the pretensioning force in all variants of the profile is closed between teeth З and 4 of worm 1 and worm wheel 2.

Therefore, the supports of worm 1 and worm wheel 2 do not receive additional load from pre-tensioning forces. The value of the preliminary tension is not limited by the bearing capacity of the supports, but can be significantly increased up to the fatigue limit of the balls and the lateral surfaces of teeth 7 and 8

Z and 4, along which they roll. An increase in the value of the preliminary tension increases the dynamic stiffness of the transmission. At the same time, its carrying capacity also increases.

Thanks to the created possibility of using a globoid worm, the moment is transmitted simultaneously by all its turns located in the engagement zone. Therefore, in proportion to the number of simultaneously working turns of the worm, the carrying capacity of the transmission increases accordingly.

Sources of information 1. Author's certificate of the USSR Mo1446389, cl. Е16Н1/16, 1987. 2. Author's certificate of the USSR Mob94709, cl. E16H1/16, 1979.

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