SU1631216A1 - Ball circulating screw mechanism - Google Patents

Abstract

The invention relates to mechanical engineering, in particular to ball screw gears, and can be used in drive drives for machine tools. The purpose of the invention is to improve accuracy and rigidity and to keep manufacturability in order to obtain a positive effect on the pins 9 of screw 2 interacting with nut 3 and, accordingly, the inner surface of the rings 6 installed in screw supports are annular grooves 10 and 11, respectively, which, together with the grooves of the pads, are installed in the grooves 12 of the rings 6. form tracks 8 rolling balls 7 screw supports In the liners there are conical holes, in which the tapered shanks of the screws are eccentrically mounted, and the diameter of the balls 7 of the supports is equal to the diameter of the balls 4 of the helical gear 1 of 3 p f files, 5 or

Description

7 5

Fig 1

The invention relates to mechanical engineering, in particular to ball screw gears, and can be used in drive feeds of machine tools.

The purpose of the invention is to improve the accuracy and rigidity and improve manufacturability.

FIG. 1 shows an axial section of the mechanism; in fig. 2 shows section A-A in FIG. one; in fig. 3 - scan of the surface of the support ring with raceways; in fig. 4 - liner; in fig. 5 - fastening the liner in the ring.

The ball screw mechanism includes a housing 1, a screw 2 rotatably mounted therein, a nut 3 interacting with it, balls 4 located in the threaded grooves of the screw 2 and a nut 3, and two screw supports 2, each of which is made as fixedly mounted in case I glass 5, installed in it three pairs of rings 6 and balls 7, located in the tracks 8 rolling. On the inner surface of the rings 6 and respectively on the pins 9 of the screw are made, respectively, annular grooves 10 and 11 with a step equal to the pitch of the screw thread. The diameter of the balls 7 support is equal to the diameter of the balls 4 screw transmission. On the outer surface of the rings 6, according to the number of grooves, tangential grooves 12 and radial holes 13 are made, which connect the grooves with the corresponding grooves of the rings. In each groove 12, an insert 14 is installed with a protrusion 15 on which a groove 16 is formed. When the liner is installed in the groove, a protrusion 15 is located in a radial hole 13, and a groove 16 mates with a corresponding groove 10 of ring 6, a groove 10 and 16 with a corresponding groove 11 on the trunnion 9 of the screws form a rolling track 8 for the corresponding ball 7. The liners 14 have tapered holes 17, into which the tapered tails of screws 18 are eccentrically mounted to attach the liners in the rings 6.

The mechanism works as follows.

During the rotation of the screw 2, the balls 4 interact with the threaded grooves of the screw 2 and the nuts 3, and the balls 7 move along the raceways 8.

The implementation of the annular grooves 11 directly on the pins of the screw 2 reduces the number of joints in the supports and, accordingly, increases the accuracy and rigidity of the mechanism. Equality of diameters of ball0

0

4 and 7 and the execution of the groove pitch And on the screw pin equal to the pitch of the screw thread grooves allows grinding of both grooves on the same thread grinder using a single screw installation at different inclinations of the same grinding wheel, which improves the manufacturability of the mechanism. In addition, making liners with tapered holes, in which the tapered shanks of the screws are eccentrically mounted, improves manufacturability, accuracy and rigidity, since it allows the outer surface of the rings to be machined together with the liners.

Claims (2)

1. A ball screw mechanism comprising a body mounted therein by means of two supports with the possibility of rotation a screw, a nut interacting with it, balls placed in the threaded grooves of the screw and nut, and two screw supports each of which is made as fixedly mounted in the body Stack5 installed in it at least one pair of rings and balls with raceways, characterized in that, in order to increase accuracy and rigidity and improve processability, the diameter of the balls in the supports is equal to the diameter of the balls 0 screw gear, on the inner surface of the rings and respectively on the pins of the screw there are ring grooves with a pitch equal to the pitch of the screw thread; on the outer surface of each ring there are tangential grooves according to the number of grooves of the rings and 5 radial holes connecting the grooves with the corresponding grooves of the ring; the mechanism is equipped according to the number of grooves of the rings by inserts with protrusions on which grooves are made; inserts are mounted 0 into the corresponding tangential grooves, the protrusions of the liners are placed in the corresponding radial holes, the grooves of the protrusions mate with the corresponding grooves of the rings, and the raceways of the support balls are formed by grooves on the axles of the screw and the corresponding grooves of the rings and protrusions. 2. The mechanism according to claim 1, characterized in that the inserts have tapered holes, the axes of which are parallel to the axis of the screw, and the mechanism is provided with a number of holes with screws with tapered shanks mounted eccentrically in the corresponding holes of the inserts and designed to be mounted in rings . Aa sixteen 13 FIG. 2 15 18 one Fig.Z 17 FIG A / 7 / / 777 /