External circulation ball screw structure with reverser cover plate

Abstract

The utility model discloses an external circulation ball screw structure with a reverser cover plate, which comprises a screw rod, a mounting nut, a ball and a reverser, the ball is arranged between the screw rod and the mounting nut, the reverser is mounted in the mounting nut, and the reverser is arranged in the mounting nut. A reverser cover plate is fixedly mounted on the outer side wall of the mounting nut relative to the position of the reverser; and the reverser cover plate covers a through hole formed in the mounting nut relative to the reverser. According to the external circulation ball screw structure with the reverser cover plate, through the effect of the reverser cover plate, the through hole in the installation nut can be effectively covered, and then the problem that in the prior art, dust and other foreign matter enter the installation nut due to the through hole is solved.

Description

Technical Field

[0001] The utility model relates to a ball screw, in particular to an outer circulation ball screw structure with a return device cover plate. Background Art

[0002] A ball screw is a commonly used linear motion device that can convert rotational motion into linear motion. Most existing ball screws currently include a screw and a nut sleeved on the screw. A plurality of balls that can reciprocate along a circular path are arranged between the screw and the nut. When a motor is used to drive the screw to rotate, relative rotation occurs between the screw and the nut, and the nut is driven to move linearly. After long-term operation, the existing ball screws will cause wear and damage to the inner wall of the return device body of the ball screw, causing the balls to get stuck at the wear point. In severe cases, the return device body will be separated from the ball screw mechanism, which will affect the stability and accuracy of the ball screw operation and reduce its service life.

[0003] For this purpose, there is a utility model patent in the prior art with patent number 201921306321.9, entitled A ball screw with an improved steel ball return device. A metal sheet with a smooth surface is provided on the inner wall of the slide groove of the return device body to reduce the wear of the ball, thereby solving the above technical problems. However, in order to install the return device on the nut body, the ball screw of the above structure has two waist-shaped grooves on the nut body. The presence of the waist-shaped grooves can easily cause foreign matter such as dust from the outside to enter the nut body, thereby affecting the operation of the ball screw. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model aims to provide an external circulation ball screw structure with a return device cover plate, which prevents foreign matter such as dust from the outside from easily entering the nut body.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an external circulation ball screw structure with a return device cover, comprising a screw, a mounting nut, a ball and a return device, wherein the ball is arranged between the screw and the mounting nut, the return device is installed in the mounting nut, and the return device cover is fixedly installed on the outer wall of the mounting nut at a position relative to the return device, and the return device cover covers the through hole opened in the mounting nut relative to the return device.

[0006] As a further improvement of the utility model, a mounting through hole is opened on the return device cover plate, and bolts are passed through the mounting through hole and threadedly connected to the outer side wall of the mounting nut to install the return device cover plate on the outer side wall of the mounting nut.

[0007] As a further improvement of the present invention, welding points are provided on the return device cover plate, so that the return device cover plate can be welded and installed to the outer side wall of the mounting nut through the welding points.

[0008] As a further improvement of the utility model, it also includes a limiting mechanism, which is installed on the screw rod and arranged at the end of the mounting nut to limit the axial displacement of the mounting nut. A nut anti-rotation sleeve is fixed to the end of the mounting nut facing away from the limiting mechanism.

[0009] As a further improvement of the utility model, the limiting mechanism includes a limiting baffle and a retaining ring. A retaining groove is opened on the side of the screw rod, and the retaining ring is embedded in the retaining groove. The limiting baffle is arranged between the retaining ring and the end of the mounting nut to abut against the end of the retaining ring and the mounting nut.

[0010] As a further improvement of the utility model, the limit baffle includes a first baffle, a rubber pad and a second baffle, the rubber pad is arranged between the first baffle and the second baffle, the first baffle is against the retaining ring, and the second baffle is against the end of the mounting nut.

[0011] As a further improvement of the present invention, the edge of one end of the first baffle facing the rubber pad is bent toward the rubber pad to form a groove structure for accommodating the rubber pad at the end of the first baffle facing the rubber pad.

[0012] As a further improvement of the utility model, the return device includes a return device seat and a return device cover, the return device seat and the return device cover are both arc-shaped, the two ends of the return device seat are connected to the inner side wall of the mounting nut, the outer side surface of the return device seat is provided with a semicircular groove, and the inner side surface of the return device cover is provided with a semicircular groove, and the two semicircular grooves are combined to form a channel for the ball to roll.

[0013] The beneficial effect of the utility model is that the mounting nut can be installed on the screw rod through the arrangement of the screw rod, the mounting nut, the ball and the return device, thereby forming an external circulation ball screw structure, and through the arrangement of the return device cover plate, the through hole opened on the mounting nut relative to the return device can be effectively covered, thereby effectively avoiding the problem of external dust and foreign matter entering the mounting nut in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the appearance structure of the outer circulation ball screw structure with a return device cover plate of the utility model;

[0015] Figure 2 It is a schematic diagram of the internal structure of the outer circulation ball screw structure with a return device cover plate of the utility model. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0017] Reference Figures 1 to 2 As shown, an external circulation ball screw structure with a return device cover plate of the present embodiment includes a screw 1, a mounting nut 2, a ball 4 and a return device 6, wherein the ball 4 is arranged between the screw 1 and the mounting nut 2, and the return device 6 is installed in the mounting nut 2. A return device cover plate 8 is fixedly installed on the outer wall of the mounting nut 2 at a position relative to the return device 6, and the return device cover plate 8 covers the through hole opened in the mounting nut 2 relative to the return device 6. Through the arrangement of the screw 1, the mounting nut 2, the ball 4 and the return device 6, a ball screw structure can be simply and effectively formed, and through the arrangement of the return device cover plate 8, the through hole opened on the mounting nut 2 corresponding to the return device 6 can be effectively covered. Therefore, compared with the method in the prior art, it can effectively avoid the operation problems caused by dust and debris entering the mounting nut 2 in the prior art.

[0018] As an improved specific implementation method, a mounting through hole is opened on the return device cover 8, and bolts are passed through the mounting through hole and threadedly connected to the outer wall of the mounting nut 2 to install the return device cover 8 on the outer wall of the mounting nut 2. Through the setting of the above-mentioned structure, the return device cover 8 can be effectively installed on the mounting nut 2 by means of bolts.

[0019] As an improved specific implementation method, welding points are provided on the return device cover 8, so that the return device cover 8 can be welded and installed to the outer wall of the mounting nut 2 through the welding points. By means of the welding points, the return device cover 8 can be simply and effectively fixed to the mounting nut 2, and the installation surface is wider and the installation can be more secure.

[0020] As an improved specific implementation method, it also includes a limiting mechanism 5, which is installed on the screw rod 1 and arranged at the end of the mounting nut 2 to limit the axial displacement of the mounting nut 2. A nut anti-rotation sleeve 7 is fixed to the end of the mounting nut 2 facing away from the limiting mechanism 5. Through the setting of the limiting mechanism 5 and the nut anti-rotation sleeve 7, the mounting nut 2 can be effectively installed on the screw rod 1.

[0021] As an improved specific embodiment, the limiting mechanism 5 includes a limiting baffle 52 and a retaining ring 51. A retaining groove 11 is opened on the side of the screw rod 1. The retaining ring 51 is embedded in the retaining groove 11. The limiting baffle 52 is arranged between the retaining ring 51 and the end of the mounting nut 2 to abut against the retaining ring 51 and the end of the mounting nut 2. Through the arrangement of the limiting baffle 52 and the retaining ring 51, the axial limiting function of the limiting baffle 52 can be achieved through the cooperation of the retaining ring 51 and the retaining groove 11, thereby achieving the axial limiting function of the mounting nut 2.

[0022] As an improved specific implementation, the limit baffle 52 includes a first baffle 521, a rubber pad 522 and a second baffle 523, the rubber pad 522 is arranged between the first baffle 521 and the second baffle 523, the first baffle 521 is abutted against the retaining ring 51, and the second baffle 523 is abutted against the end of the mounting nut 2. Through the arrangement of the first baffle 521, the rubber pad 522 and the second baffle 523, the setting of the rubber pad 522 is effectively used to achieve elasticity of the limit baffle 52, which can better limit the axial direction of the mounting nut 2 and avoid loosening after installation.

[0023] As an improved specific implementation, the edge of one end of the first baffle 521 toward the rubber pad 522 is bent toward the rubber pad 522 to form a groove structure for accommodating the rubber pad 522 at the end of the first baffle 521 toward the rubber pad 522. By bending the edge of the first baffle 521 toward the rubber pad 522, the groove structure can be used to further limit the rubber pad 522, thereby increasing the firmness of the installation.

[0024] As an improved specific implementation method, the return device 6 includes a return device seat 61 and a return device cover 62, the return device seat 61 and the return device cover 62 are both arc-shaped, the two ends of the return device seat 61 are connected to the inner wall of the mounting nut 2, the outer side surface of the return device seat 61 is provided with a semicircular groove, and the inner side surface of the return device cover 62 is provided with a semicircular groove. The two semicircular grooves are combined to form a channel for the ball 4 to roll. The return device seat 61 and the return device cover 62 can be simply and effectively combined to form a channel for the ball 4 to roll, thereby realizing the reversal of the steel ball and continuous operation.

[0025] In summary, the external circulation ball screw structure with a return device cover of the utility model can effectively constitute a ball screw structure through the arrangement of the screw 1, the mounting nut 2, the ball 4 and the return device 6. By setting the return device cover 8, the through hole on the mounting nut 2 can be covered by the return device cover 8, which effectively avoids the problem of dust and debris entering the mounting nut 2 in the prior art.

[0026] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An external circulation ball screw structure with a return cover, characterized in that: The invention comprises a screw rod (1), a mounting nut (2), a ball (4) and a return device (6), wherein the ball (4) is arranged between the screw rod (1) and the mounting nut (2), the return device (6) is installed in the mounting nut (2), a return device cover plate (8) is fixedly installed on the outer wall of the mounting nut (2) at a position relative to the return device (6), and the return device cover plate (8) covers a through hole opened in the mounting nut (2) relative to the return device (6).

2. The outer circulation ball screw structure with return device cover plate according to claim 1 is characterized in that: The return device cover plate (8) is provided with a mounting through hole, and a bolt is passed through the mounting through hole and threadedly connected to the outer side wall of the mounting nut (2), so that the return device cover plate (8) is mounted on the outer side wall of the mounting nut (2).

3. The outer circulation ball screw structure with return device cover plate according to claim 1, characterized in that: The return device cover plate (8) is provided with welding points, so that the return device cover plate (8) can be welded and installed on the outer side wall of the mounting nut (2) through the welding points.

4. The outer circulation ball screw structure with a return device cover plate according to claim 1, 2 or 3, characterized in that: It also includes a limiting mechanism (5), which is mounted on the screw rod (1) and arranged at the end of the mounting nut (2) to limit the axial displacement of the mounting nut (2), and a nut anti-rotation sleeve (7) is fixed to one end of the mounting nut (2) facing away from the limiting mechanism (5).

5. The outer circulation ball screw structure with return device cover plate according to claim 4, characterized in that: The limiting mechanism (5) comprises a limiting baffle (52) and a snap ring (51); a snap groove (11) is provided on the side of the screw rod (1); the snap ring (51) is embedded in the snap groove (11); and the limiting baffle (52) is arranged between the snap ring (51) and the end of the mounting nut (2) so as to abut against the end of the snap ring (51) and the mounting nut (2).

6. The outer circulation ball screw structure with return device cover plate according to claim 5, characterized in that: The limit baffle (52) comprises a first baffle (521), a rubber pad (522) and a second baffle (523); the rubber pad (522) is arranged between the first baffle (521) and the second baffle (523); the first baffle (521) abuts against the retaining ring (51); and the second baffle (523) abuts against the end of the mounting nut (2).

7. The outer circulation ball screw structure with return device cover plate according to claim 6, characterized in that: The edge of one end of the first baffle (521) facing the rubber pad (522) is bent toward the rubber pad (522) to form a groove structure for accommodating the rubber pad (522) at the end of the first baffle (521) facing the rubber pad (522).

8. The outer circulation ball screw structure with return device cover plate according to claim 7, characterized in that: The returner (6) comprises a returner seat (61) and a returner cover (62), the returner seat (61) and the returner cover (62) are both arc-shaped, the two ends of the returner seat (61) are connected to the inner side wall of the mounting nut (2), the outer side surface of the returner seat (61) is provided with a semicircular groove, and the inner side surface of the returner cover (62) is provided with a semicircular groove, and the two semicircular grooves are combined to form a channel for the ball (4) to roll.

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