SU1504441A1 - Ball-and-screw mechanism - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in mechanisms for converting rotational motion into translational. The aim of the invention is to increase the load capacity by increasing the normal pressure force and load distribution between the separator and the yoke. To obtain a positive effect, arched grooves are made on the inner surface of the cage from parts 4 and 5, designed to interact with the corresponding balls 6. The separators 2 and 3, carried by the balls 6, rotate freely, and the screw 1 moves progressively. As a result, the transmitted load is separated: axially perceived by separators 2 and 3, and the tangential-holder from parts 4 and 5. Arched grooves provide two-point contact with the balls and increase the force of normal pressure at the same tension value with the holder. 3 il.

Description

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The invention relates to mechanical engineering and can be used in mechanisms for converting rotational motion into translational.

The purpose of the invention is to increase the load capacity by increasing the force of the normal pressure and distributing the load between the separator and the yoke.

FIG. 1 shows a ball screw; in fig. 2 is a section A-A in FIG. one; in fig. 3 - separator reamer. The ball screw mechanism contains a screw 1, two separators 2 and 3, which are movably mounted between themselves and relative to the holder, consisting of w, it consists of parts 4 and 5, which

The torque from the drive is transmitted through the thrust rings 7 and 8 to the parts of the holder 4 and 5 rigidly connected with them. At the points of contact of the balls 6 with the holder, tangential forces arise, which turn the rows of balls together with the separators 2 and 3 around the axis of the screw 1 The separators 2 and 3, carried away by the balls 6, rotate freely, and the screw 1 moves progressively. At the points of contact of balls 6 with profiles

 the threads of the screw 1 and the openings of the separators 2 and 3 generate axial forces that move the screw on one side and the adjusting device through the separators, balls 14, thrust bushings 7 and 8 are closed

rigidly connected to one another. Parts 4 and 5 5 on the drive parts. As a result, pereborooyami are installed with tension and through the balls 6 are in contact with the thread profile of the screw I. The stop rings 7 and 8 are rigidly connected to the drive, and also provide a fixed connection of the parts 4 and 5 of the yoke and the gaps between the flanges of the parts with the end surfaces of the round cap nut 9 and adjusting nuts 10 and 11. The rings 12 and 13 are movably connected to the nut 9 by the outer cylindrical surfaces, the inner conical surfaces are in contact with the flanges of the separators 2 and 3, and the face nuts are adjusted to the adjusting nuts 10 and 11. Separate ry 2 and 3 are supported in the axial direction of the balls 14 which are arranged circumferentially in the channel formed by the abutment rings 7 and 8 and the union nut 9.

The working parts of separators 2 and 3 are made in the form of cylinders with parallel rows of holes located along a helical line, in which the balls 6 are placed with a gap, and the flanges have conical surfaces (Fig. 3). The parts of the cage 4 and 5 are made with grooves in the shape of an arch along the inner surface in which the balls 6 are placed. The surfaces of the grooves with tension cover the rows of balls at two points of contact (Fig. 2). Round nut 9 is made with left and right threads for adjusting nuts 10 and 11 with a semi-circular channel around the perimeter.

Ball screw mechanism works as follows.

20

25

thirty

35

40

The load is divided: the axial is perceived by separators 2 and 3, and the tangential load is taken from parts 4 and 5.

In the proposed mechanism it is possible to use screws with any thread profile, to unify the standard size for different loads by changing the number of parallel rows of balls in the same design.

In addition, the design of the proposed mechanism due to the high load capacity allows the movement to be transmitted with the necessary precision in the course of long-term operation with partial wear of parts without replacing them. Making the cage with internal longitudinal strong grooves ensures two-point contact with the balls and increases the force of the normal pressure at the same tension value with the cage.

Claims (1)

Invention Formula A ball mechanism containing screws, separators with rows of holes arranged along a helical line, balls interacting with the screw grooves located in these holes, and a holder covering the screw and separators, characterized in that in order to increase the load capacity by increasing the force normal pressure and load distribution, arched grooves are made on the inner surface of the cage for contact with appropriate balls The torque from the drive is transmitted through the thrust rings 7 and 8 to the rigidly connected parts of the holder 4 and 5. At the points of contact of the balls 6 with the holder, tangential forces arise which rotate the rows of balls together with separators 2 and 3 around the axis of the screw 1. The separators 2 and 3, carried away by the balls 6, rotate freely, and the screw 1 moves progressively. At the points of contact of balls 6 with profiles the threads of the screw 1 and the openings of the separators 2 and 3 generate axial forces that move the screw on one side and the adjusting device through the separators, balls 14, thrust bushings 7 and 8 are closed on the drive parts. As a result, before five 0 five 0 The load is divided: the axial is perceived by separators 2 and 3, and the tangential load is taken from parts 4 and 5. In the proposed mechanism it is possible to use screws with any thread profile, to unify the standard size for different loads by changing the number of parallel rows of balls in the same design. In addition, the design of the proposed mechanism due to the high load capacity allows the movement to be transmitted with the necessary precision in the course of long-term operation with partial wear of parts without replacing them. Making the cage with internal longitudinal strong grooves ensures two-point contact with the balls and increases the force of the normal pressure at the same tension value with the cage. Invention Formula A ball mechanism with screws, separators with rows of holes arranged along a helical line, balls interacting with the screw grooves located in these holes, and a holder covering the screw and separators, in order to increase the load capacity by increasing The forces of normal pressure and load distribution, on the inner surface of the cage, are arched grooves intended for contact with the respective balls. E- & FIG. 2 FIG. J