SU427189A1 - WARMERS REDUCING - Google Patents

Description

The invention relates to the field of machine production. Worm gears are used to transmit movement between non-reversing shafts and the need for reduction.

Worm gears are known for rolling, containing a worm, a worm gear, interacting with each other by means of balls arranged in several rows in height of turns of a screw, a device for returning balls made at the end of turns of a screw in which balls return from one side of the coil to the other.

A disadvantage of the known constructions is the lower kinematic accuracy, the complexity of the design and the manufacturing technology, which depend on the number of rows of balls located at the height of the coil and the method of fastening the direction of the ball to hold the balls in the worm.

The proposed worm gear transmission is different from the known ones in that the turns of the screw consist of a series of teeth formed by calling slots made in the section of the coil of the screw and the transfer is equipped with conical inserts installed from the ends of the teeth, guided, worn on the teeth and the tapered liners and one on top of the other, and a screw tape that keeps the guides from falling out.

Such an embodiment of the worm gear rolling increases its toughness, it simplifies the design and manufacturing technology. FIG. 1 shows the worm transmission

with a partial section along the axis of the screw; in fig. 2 is a section along the AL in FIG. one; in fig. 3 is a diagram of the contact of the balls with the teeth of the worm and the worm gear; in fig. 4 - a worm tooth with conical inserts and guides ip; FIG. 5 - diagram of the contact of the balls in the transmission with the teams sent ush; in fig. 6 — front assembly; FIG. 7 - the same, top view.

The transmission consists of a worm 1 (Fig. I, which can be cylindrical or globoid and have a straight or curvilinear profile, a worm gear 2. balls 3 located between the turns of a worm and a worm gear teeth in several rows the height of the screw turns. On the screw ke / there are grooves 4 (FIGS. 1, 2), cutting the turns of the screw and forming a row of teeth 5 along a helix. The grooves 4 can be located parallel to the axis of the screw inclined to it, along a helix or in chess order. Number of grooves 4 and length of teeth b EB 5 may be different.

From the ends of each tooth 5 two conical inserts 6 are installed. The teeth 5 and conical inserts 6 are freely put on and mounted one on another guides 7. Between the ends of the guides 7 of two adjacent teeth of a screw there is a gap 8. The guides 7 are closed treadmills (figs. 3, 4), in which the balls move around the tooth. Thanks to the guides 7 and the treadmills on the guides, the balls do not fall out of the screw and can come into contact with the tooth of the screw and the worm wheel.

For the purpose of averaging errors when hooking the screw with the wheel and increasing the accuracy of the transmission, the guides 7 may have different thickness, with the result that the circulating chains of balls on the teeth x will be shifted in height.

A screw tape 10 is installed on the outer cylindrical surface of the teeth in 5, which keeps the guides 7 from falling out of the screw. The ends of the tape 10 are rigidly attached to the screw in any manner. The screw tape 10 may be made in the form of a thin cylindrical cup, having a helical through groove in the place of engagement of the screw with the wheel, where the wheel teeth enter.

The collecting guide 7 may consist of two thin curved plates 11, the edges 12 of which are bent and rolled to hold the balls in the worm (see Fig. 6 and 7). On the ends of the plates are installed pads 13. Plates and pads rivet or glue.

The transmission works as follows. When the worm rotates, the balls roll from one side of the tooth to the other, and on one side they come into contact with the tooth, the wheels transfer the load, and move freely to the other, since there is a gap 14 between the balls and the tooth of the wheel. When the screw is rotated in the opposite direction A gap appears on the opposite side of the tooth of the screw.

Constructive execution of a worm makes it possible to work in tandem with a worm or cogwheel, as well as with a rack with helical teeth. Worm can be performed as a single or multiple.

Subject invention

Worm gear rolling, containing a worm, a worm wheel, interacting with each other by means of balls arranged in several rows along the height of turns of a worm, a device for returning balls,

made at the end of the turns of the screw, in which the balls pass from one side of the turn to the other, characterized in that, in order to improve the transfer accuracy, simplify its design and manufacturing technology, the device for returning the balls is made so that the holes of the screw t of a number of teeth formed by shear grooves made at the site of the worm coil, and the gear is equipped with conical inserts installed at the ends of the teeth, guiding them, put on top of the teeth and conical inserts and mounted one on the other and with a screw tape that keeps the guides from falling out.

Fig 5

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