CN220302660U - Ball screw pair nut anti-rotation device - Google Patents

Abstract

The utility model relates to the technical field of fixing devices, in particular to a ball screw pair nut anti-rotation device which comprises a screw rod, a nut and a guide sleeve, wherein the nut is in threaded connection with the screw rod, the guide sleeve is axially arranged along the screw rod, the screw rod and the nut are arranged in the guide sleeve, and a limiting mechanism for limiting the circumferential movement of the nut along the central axis of the screw rod is arranged between the guide sleeve and the nut.

Description

Ball screw pair nut anti-rotation device

Technical Field

The utility model relates to the technical field of anti-rotation devices, in particular to a ball screw pair nut anti-rotation device.

Background

The ball screw pair is generally used for converting the circular motion of the motor into linear motion, has high precision and precision stability, and achieves the performances of high rigidity, high bearing capacity, self lubrication, low noise, small temperature rise, long service life and the like. But there are factors such as frictional force between screw and the nut in ball, receive friction torque at screw circular motion simultaneously, lead to the nut to follow the screw and carry out circular motion, greatly reduced ball's transmission precision, increase the frictional force between screw and the nut, noise grow appears when serious, nut and the local temperature rise of screw have also reduced the life of screw and nut.

Disclosure of Invention

The utility model aims to solve the technical problems that: in order to solve the problems that in the existing ball screw, friction force exists between the screw and the nut, and the like, the nut is subjected to friction torque during circumferential movement of the screw, so that the nut can perform circumferential movement along with the screw, the transmission precision of the ball screw is greatly reduced, the friction force between the screw and the nut is increased, noise is increased, the local temperature of the nut and the screw rises when serious, and the service lives of the screw and the nut are also reduced, and the nut anti-rotation device of the ball screw pair is provided.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a ball screw pair nut anti-rotation device, includes lead screw, nut and uide bushing, nut threaded connection is on the lead screw, the uide bushing sets up along the lead screw axial, lead screw and nut set up in the uide bushing, be provided with the stop gear who is used for restricting nut along lead screw central axis circular motion between uide bushing and the nut. Compared with the prior art, the guide sleeve is axially arranged outside the nut along the screw rod, the displacement of the nut along the circumferential direction of the central axis of the screw rod is limited by the limiting mechanism between the guide sleeve and the nut, the transmission precision of the screw rod and the nut is ensured, the friction force between the screw rod and the nut is indirectly reduced, the local temperature rise between the screw rod and the nut is prevented, and the noise is increased when the transmission between the screw rod and the nut is caused.

Preferably, in some embodiments, the limiting mechanism includes a slider, the slider is disposed on the nut, a chute is formed in an inner peripheral wall of the guide sleeve, the chute is axially disposed along the screw rod, the chute is matched with the slider, and the slider is slidably disposed in the chute.

In some preferred embodiments, a key groove is formed in the outer peripheral surface of one side, opposite to the sliding block, of the nut, a flat key is arranged in the key groove, a groove matched with the flat key is formed in the sliding block, and the flat key is arranged in the groove.

Preferably, in some embodiments, the slider is provided with a plurality of sliders along the circumference of the nut.

Preferably, in some embodiments, a plurality of the sliding blocks are uniformly distributed along the circumference.

In some preferred embodiments, the material of the sliding block is polyoxymethylene.

The beneficial effects of the utility model are as follows: when the ball screw pair nut anti-rotation device is used, the guide sleeve is arranged outside the nut along the axial direction of the screw rod, the displacement of the nut along the circumferential direction of the central axis of the screw rod is limited by the limiting mechanism between the guide sleeve and the nut, the transmission precision of the screw rod and the nut is ensured, the friction force between the screw rod and the nut is indirectly reduced, the local temperature rise between the screw rod and the nut is prevented, the noise is increased during the transmission between the screw rod and the nut, the friction force and other factors in the existing ball screw are avoided, the nut is subjected to friction torque during the circumferential motion of the screw rod, the nut can perform the circumferential motion along with the screw rod, the transmission precision of the ball screw rod is greatly reduced, the friction force between the screw rod and the nut is increased, the noise is increased, the local temperature of the screw rod and the screw rod rises, and the service life of the screw rod and the nut is also reduced.

Drawings

The utility model will be further described with reference to the drawings and examples.

FIG. 1 is a schematic three-dimensional structure of the present utility model;

FIG. 2 is a front view of the present utility model;

FIG. 3 is a left side view of the present utility model;

FIG. 4 is a cross-sectional view A-A of FIG. 2;

FIG. 5 is a cross-sectional view B-B of FIG. 3;

FIG. 6 is an enlarged view of a portion of C in FIG. 4;

FIG. 7 is a three-dimensional schematic of a guide sleeve of the present utility model;

fig. 8 is a schematic view of the installation structure of the screw and the nut in the present utility model.

In the figure: 1. the device comprises a screw rod, 2, a nut, 3, a guide sleeve, 4, a sliding block, 5, a sliding groove, 6, a flat key, 7 and a groove.

Detailed Description

The utility model is further described in detail below in connection with the examples:

the present utility model is not limited to the following embodiments, and those skilled in the art can implement the present utility model in various other embodiments according to the present utility model, or simply change or modify the design structure and thought of the present utility model, which fall within the protection scope of the present utility model. It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in a specific case.

As shown in fig. 1-8, the ball screw pair nut anti-rotation device comprises a screw rod 1, a nut 2 and a guide sleeve 3, wherein the nut 2 is in threaded connection with the screw rod 1, the guide sleeve 3 is axially arranged along the screw rod 1, the screw rod 1 and the nut 2 are arranged in the guide sleeve 3, a limiting mechanism is arranged between the guide sleeve 3 and the nut 2, and the limiting mechanism is used for limiting the nut 2 to move circumferentially along the central axis of the screw rod 1.

One implementation of the limiting mechanism in this embodiment is specifically: the limiting mechanism comprises a sliding block 4, the sliding block 4 is arranged on the nut 2, a sliding groove 5 is formed in the inner peripheral wall of the guide sleeve 3, the sliding groove 5 is axially arranged along the screw rod 1, the sliding groove 5 is matched with the sliding block 4, and the sliding block 4 is arranged in the sliding groove 5 in a sliding manner. Of course, the limit mechanism can also be a linear guide rail arranged between the guide sleeve 3 and the nut 2 and matched with the slide block 4, etc. besides the structure.

The nut 2 is provided with the keyway on the outer peripheral face of slider 4 one side relatively, is provided with flat key 6 in the keyway, is provided with on the slider 4 with flat key 6 assorted recess 7, flat key 6 sets up in recess 7.

In order to reduce friction between the guide sleeve 3 and the nut 2, two sliding blocks 4 are arranged along the circumference of the nut 2, of course, the sliding blocks 4 are also three, four, five or more, and the two sliding blocks 4 are uniformly distributed along the circumference, and the sliding blocks 4 are made of polyoxymethylene. By setting the material of the slider 4 to polyoxymethylene, polyoxymethylene has hardness, strength and rigidity similar to those of metal, has excellent self-lubricity, excellent fatigue resistance and is rich in elasticity in a wide temperature and humidity range.

When the ball screw pair nut anti-rotation device is used, the guide sleeve 3 is fixed on external equipment, the nut 2 rotates relative to the screw 1 and moves towards one end when the screw 1 rotates, meanwhile, the sliding block 4 moves in the sliding groove 5 of the guide sleeve 3, the sliding block 4 is made of polyoxymethylene, the polyoxymethylene has a self-lubricating effect, and friction between the sliding block 4 and the sliding groove 5 is reduced.

The above-described preferred embodiments according to the present utility model are intended to suggest that, from the above description, various changes and modifications can be made by the worker in question without departing from the technical spirit of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.

Claims (6)

1. The utility model provides a ball screw pair nut anti-rotation device, includes lead screw (1) and nut (2), its characterized in that: still include uide bushing (3), nut (2) threaded connection is on lead screw (1), uide bushing (3) are along lead screw (1) axial setting, lead screw (1) and nut (2) set up in uide bushing (3), be provided with the stop gear who is used for restricting nut (2) along lead screw (1) central axis circular motion between uide bushing (3) and nut (2).

2. The ball screw assembly nut anti-rotation device according to claim 1, wherein: the limiting mechanism comprises a sliding block (4), the sliding block (4) is arranged on the nut (2), a sliding groove (5) is formed in the inner peripheral wall of the guide sleeve (3), the sliding groove (5) is axially formed along the screw rod (1), the sliding groove (5) is matched with the sliding block (4), and the sliding block (4) is arranged in the sliding groove (5) in a sliding mode.

3. The ball screw assembly nut anti-rotation device according to claim 2, wherein: the nut is characterized in that a key groove is formed in the outer peripheral surface of the nut (2) opposite to one side of the sliding block (4), a flat key (6) is arranged in the key groove, a groove (7) matched with the flat key (6) is formed in the sliding block (4), and the flat key (6) is arranged in the groove (7).

4. A ball screw set nut anti-rotation device according to claim 3, wherein: the sliding blocks (4) are arranged along the circumference of the nut (2).

5. The ball screw assembly nut anti-rotation device according to claim 4, wherein: the sliding blocks (4) are uniformly distributed along the circumference.

6. The ball screw assembly nut anti-rotation device according to claim 2, wherein: the sliding block (4) is made of polyformaldehyde.