Ball nut circulator

Abstract

The utility model relates to the technical field of ball nut circulators, in particular to a ball nut circulator which comprises a lead screw, a circulation assembly is arranged on the outer wall of the lead screw, and sealing assemblies are installed at opposite ports of the circulation assembly. The internal circulation balls are placed in the ball returner for internal circulation, otherwise, the external circulation balls are placed in the flow guide pipe for external circulation, the practicability of the device is better, and internal circulation or external circulation can be switched according to actual use requirements; a sealing base plate and a sealing sleeve are matched with each other, sealing lubricating grease is arranged in an inner cavity of a conical fence, the sealing base plate is used for preventing dust of a nut sleeve, the sealing lubricating grease is used for sealing the sealing base plate, and meanwhile when the device slides, an annular scraper is arranged in the inner cavity of the sealing sleeve; and the sealing lubricating grease on the surface of the lead screw is scraped away by the annular scraping plate, so that the sealing lubricating grease is always located in the inner cavity of the conical enclosure, and the dustproof effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of ball nut circulators, in particular to a ball nut circulator. Background Art

[0002] As a precision transmission device that converts rotational motion into linear motion, the ball screw pair ensures precise relative displacement between the screw and the nut while transmitting power. One of its notable features is its low coefficient of friction. To allow the balls to circulate within the nut, a circulator is installed in the nut. Existing circulators are divided into internal and external circulation structures.

[0003] When the ball never leaves the surface of the screw during the circulation process, it is an internal circulation. The internal circulation structure is compact, the nut is small, the outer diameter of the inner circulation nut is small, and the load is small. It is suitable for small and light-load screws with high sensitivity and high-precision transmission characteristics, but it is not suitable for heavy loads and the reverser is difficult to process. When the ball returns to the screw and nut through the spiral groove or cannula on the outer surface of the nut, it is an external circulation. The radial dimension of the external circulation structure is larger and the manufacturing is simpler. The external circulation has wide adaptability and large installation space. The external circulation can withstand higher working temperatures and is mostly used for large and heavy-loaded screws.

[0004] The internal and external circulation designs of existing ball circulators have their own characteristics, but they all have certain limitations. The current circulator design fails to achieve the function of flexibly switching between internal and external circulation modes according to the needs of actual application scenarios, which to a certain extent limits its adaptability and efficiency. For example, the prior art represented by the comparative document ball circulator (publication number CN218882920U) is a patented technology that provides a protective component composed of an integrally formed bottom plate and a dustproof sheet. The circulator is composed of a base and an upper cover, and the opposite surfaces of the base and the upper cover are respectively provided with positioning holes and positioning posts, and the positioning posts are inserted into the positioning holes to assemble and connect the base and the upper cover; wherein the circulator is composed of a base and an upper cover, and positioning posts and positioning holes are provided to facilitate the alignment of the base and the upper cover. The base and the upper cover are both sealed structures, which can prevent foreign matter from entering the circulation channel and affecting the circulation of the balls; at the same time, a dustproof sheet is provided on the outside of the circulator, which can prevent dust from entering the gap of the circulator on the one hand, and prevent the outside of the circulator from being scratched on the other hand, thereby effectively solving the problems of the prior art. However, its structure still needs to be improved, as follows:

[0005] In this solution, only a dustproof sheet is used to protect the circulator from dust. Since there is a thread groove gap between the screw rod and the circulator, the dustproof sheet cannot block the dust in the thread groove cavity. The dustproof performance is weak and the practicality is poor. Therefore, a ball nut circulator is needed to improve the above problems. Utility Model Content

[0006] In order to solve the problem that when a ball nut circulator is used, only a dustproof sheet is used to prevent the circulator from dust. Since there is a thread groove gap between the screw rod and the circulator, the dustproof sheet cannot block the dust in the inner cavity of the thread groove, and the dustproof performance is weak and the practicality is poor. The utility model provides a ball nut circulator to solve the above problem.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A ball nut circulator includes a screw rod, a circulation component on the outer wall of the screw rod, a sealing component installed at the opposite ends of the circulation component, a spiral groove opened on the outer wall of the screw rod, and a fixing block provided at the opposite ends of the screw rod.

[0009] As a preferred solution of the present invention, the circulation component includes a nut sleeve, which is slidably connected to the outer wall of the screw rod, and an internal circulation thread groove is opened on the inner wall of the nut sleeve, and an internal circulation ball is slidably connected to the inner wall of the internal circulation thread groove.

[0010] As a preferred solution of the present invention, the inner circulation ball is slidably connected to the outer wall of the screw rod, and a ball returner is embedded in one side of the inner circulation ball and located on the outer wall of the nut sleeve, and conduits are respectively provided on the outer walls opposite to the ball returner.

[0011] As a preferred solution of the present invention, one end of the conduit passes through the nut sleeve and extends to the inner wall of the inner circulation thread groove, and an outer circulation thread groove is provided on one side of the inner circulation thread groove and on the inner wall of the nut sleeve.

[0012] As a preferred solution of the present invention, an external circulation ball is slidably connected to the inner wall of the external circulation thread groove, and the external circulation ball is slidably connected to the outer wall of the screw rod, and a guide tube is installed on one side of the external circulation ball and on the outer wall of the nut sleeve, and one end of the guide tube passes through the nut sleeve and extends to the inner wall of the external circulation thread groove.

[0013] As a preferred solution of the present invention, the sealing assembly includes a sealing gasket and a sealing sleeve. The sealing gasket is installed at the port of the nut sleeve through bolts, and a conical enclosure is embedded in one side of the sealing gasket and located on the outer wall of the nut sleeve.

[0014] As a preferred solution of the present invention, a sealing sleeve is installed at one end of the conical enclosure, the sealing sleeve is slidably connected to the outer wall of the screw, and an annular scraper is embedded in one side of the screw and located on the inner wall of the sealing sleeve.

[0015] As a preferred solution of the present invention, the connection method between the inner circulation ball and the conduit is a sliding connection, the connection method between the outer circulation ball and the guide tube is a sliding connection, the material of the annular scraper is rubber material, and sealing grease is provided between the sealing pad and the sealing sleeve and on the inner wall of the conical enclosure.

[0016] Compared with the prior art, the present invention can realize switching between internal circulation and external circulation according to actual usage needs by setting a circulation component in the ball nut circulator. When internal circulation is required, it is only necessary to put the inner circulation balls into the ball returner for internal circulation. Conversely, the outer circulation balls are placed in the guide tube for external circulation. The practicality of the device is better, thereby solving the problem that the current circulator design fails to realize the function of flexibly switching between internal and external circulation modes according to the needs of actual application scenarios, which limits its adaptability and effectiveness to a certain extent.

[0017] The utility model can realize the mutual cooperation of the sealing gasket and the sealing sleeve by arranging a sealing component in the ball nut circulator, and sealing grease is arranged in the inner cavity of the conical enclosure. The sealing gasket protects the nut sleeve from dust, and the sealing grease seals the sealing gasket. At the same time, when the device slides, an annular scraper is arranged in the inner cavity of the sealing sleeve. The annular scraper scrapes away the sealing grease on the surface of the screw rod, so that the sealing grease is always located in the inner cavity of the conical enclosure, with better dustproof effect, thereby solving the problem that the dustproof sheet cannot block the dust in the inner cavity of the thread groove, and the dustproof performance is weak and the practicality is poor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a side structural diagram of the present utility model;

[0020] Figure 3 This is a schematic diagram of the nut sleeve structure analysis of the utility model;

[0021] Figure 4 This is a schematic diagram of the circulation component structure of the utility model;

[0022] Figure 5 For this utility model Figure 4 A magnified schematic diagram of the A structure.

[0023] In the figure: 1. Screw; 2. Circulation assembly; 201. Nut sleeve; 202. Inner circulation thread groove; 203. Inner circulation ball; 204. Ball returner; 205. Cone; 206. Outer circulation thread groove; 207. Outer circulation ball; 208. Guide tube; 3. Sealing assembly; 301. Sealing pad; 302. Sealing sleeve; 303. Conical enclosure; 304. Annular scraper; 4. Spiral groove; 5. Fixing block. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] Example: See Figure 1-5 The ball nut circulator shown includes a screw 1, a circulation component 2 on the outer wall of the screw 1, a sealing component 3 installed at the opposite end of the circulation component 2, a spiral groove 4 is opened on the outer wall of the screw 1, and a fixing block 5 is provided at the opposite end of the screw 1.

[0026] In this embodiment, specific reference Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The circulation component 2 includes a nut sleeve 201, which is slidably connected to the outer wall of the screw rod 1. An inner circulation thread groove 202 is provided on the inner wall of the nut sleeve 201. An inner circulation ball 203 is slidably connected to the inner wall of the inner circulation thread groove 202. The inner circulation ball 203 is slidably connected to the outer wall of the screw rod 1, and a ball returner 204 is embedded in one side of the inner circulation ball 203 and located on the outer wall of the nut sleeve 201. A conduit 205 is respectively provided on the outer wall opposite to the ball returner 204. One end of the conduit 205 penetrates The nut sleeve 201 extends to the inner wall of the inner circulation thread groove 202, and an outer circulation thread groove 206 is opened on one side of the inner circulation thread groove 202 and located on the inner wall of the nut sleeve 201. The inner wall of the outer circulation thread groove 206 is slidably connected with an outer circulation ball 207, and the outer circulation ball 207 is slidably connected to the outer wall of the screw rod 1, and a guide tube 208 is installed on one side of the outer circulation ball 207 and located on the outer wall of the nut sleeve 201. One end of the guide tube 208 passes through the nut sleeve 201 and extends to the inner wall of the outer circulation thread groove 206.

[0027] In this embodiment, specific reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 The sealing assembly 3 includes a sealing plate 301 and a sealing sleeve 302. The sealing plate 301 is installed at the port of the nut sleeve 201 through bolts. A conical enclosure 303 is embedded in one side of the sealing plate 301 and located on the outer wall of the nut sleeve 201. The sealing sleeve 302 is installed at one end of the conical enclosure 303. The sealing sleeve 302 is slidably connected to the outer wall of the screw rod 1, and an annular scraper 304 is embedded in one side of the screw rod 1 and located on the inner wall of the sealing sleeve 302.

[0028] Among them, the connection method between the inner circulation ball 203 and the conduit 205 is a sliding connection, so that the inner circulation ball 203 circulates through the conduit 205, and the connection method between the outer circulation ball 207 and the guide tube 208 is a sliding connection, so that the outer circulation ball 207 circulates through the guide tube 208. The material of the annular scraper 304 is rubber material, and sealing grease is provided between the sealing pad 301 and the sealing sleeve 302 and on the inner wall of the conical enclosure 303.

[0029] When the ball nut circulator of this scheme is working, the nut sleeve 201 is slidably connected to the outer wall of the screw rod 1, and the inner wall of the nut sleeve 201 is provided with an inner circulation thread groove 202. Under the action of the outer circulation thread groove 206 provided on one side of the inner circulation thread groove 202 and the inner wall of the nut sleeve 201, the inner circulation thread groove 202 and the outer circulation thread groove 206 are provided in the inner cavity of the circulation component 2 in sequence. At this time, the inner circulation ball 203 is slidably connected to the inner wall of the inner circulation thread groove 202. The inner circulation ball 203 is slidably connected to the outer wall of the screw rod 1, and under the action of the ball returner 204 embedded in the outer wall of the nut sleeve 201 on one side of the inner circulation ball 203, the ball returner 204 and the inner circulation ball 203 cooperate with each other to play the role of an inner circulator. At the same time, the outer An outer circulation ball 207 is slidably connected to the inner wall of the circulation thread groove 206, and the outer circulation ball 207 is slidably connected to the outer wall of the screw rod 1, and a guide tube 208 is installed on one side of the outer circulation ball 207 and on the outer wall of the nut sleeve 201. Under the action of the guide tube 208 and the outer circulation ball 207, the guide tube 208 and the outer circulation ball 207 cooperate with each other to play the role of an outer circulator. When in use, according to actual use needs, when internal circulation is needed, it is only necessary to put the inner circulation ball 203 into the ball returner 204 for internal circulation use, otherwise, the outer circulation ball 207 is put into the guide tube 208 for external circulation use. The practicality of the device is better, thereby solving the problem that the current circulator design fails to realize the function of flexibly switching the internal and external circulation modes according to the needs of actual application scenarios, which limits its adaptability and efficiency to a certain extent;

[0030] A sealing sleeve 302 is installed at one end of the conical enclosure 303, and the sealing sleeve 302 is slidably connected to the outer wall of the screw rod 1, and an annular scraper 304 is embedded in the inner wall of the sealing sleeve 302 on one side of the screw rod 1. Under the action of sealing grease provided between the sealing gasket 301 and the sealing sleeve 302 and on the inner wall of the conical enclosure 303, the sealing grease is put into the inner cavity of the conical enclosure 303. Since sealing gaskets 301 are respectively provided at the ports of the nut sleeve 201, the sealing gaskets 301 prevent dust from entering the nut sleeve 201, and a conical enclosure 301 is provided on one side of the sealing gasket 301. 3. At the same time, a sealing sleeve 302 is provided on one side of the conical enclosure 303, and the sealing sleeve 302 is sleeved on the outer wall of the screw rod 1. Since the inner cavity of the conical enclosure 303 is provided with sealing grease, the sealing grease seals the sealing gasket 301. At the same time, when the device slides, an annular scraper 304 is provided in the inner cavity of the sealing sleeve 302. The annular scraper 304 scrapes away the sealing grease on the surface of the screw rod 1, so that the sealing grease is always located in the inner cavity of the conical enclosure 303, and the dustproof effect is better, thereby solving the problem that the dustproof sheet cannot block the dust in the inner cavity of the thread groove, and the dustproof performance is weak and the practicality is poor.

[0031] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ball nut circulator, comprising a screw (1), characterized in that: A circulation assembly (2) is provided on the outer wall of the screw rod (1), and a sealing assembly (3) is installed at the opposite end of the circulation assembly (2). A spiral groove (4) is provided on the outer wall of the screw rod (1), and a fixing block (5) is provided at the opposite end of the screw rod (1).

2. The ball nut circulator according to claim 1, characterized in that: The circulation assembly (2) comprises a nut sleeve (201), the nut sleeve (201) being slidably connected to the outer wall of the screw rod (1), an inner circulation thread groove (202) being provided on the inner wall of the nut sleeve (201), and an inner circulation ball (203) being slidably connected to the inner wall of the inner circulation thread groove (202).

3. The ball nut circulator according to claim 2, characterized in that: The inner circulation ball (203) is slidably connected to the outer wall of the screw rod (1), and a ball returner (204) is embedded in one side of the inner circulation ball (203) and located on the outer wall of the nut sleeve (201), and a guide tube (205) is respectively provided on the outer wall opposite to the ball returner (204).

4. The ball nut circulator according to claim 3, characterized in that: One end of the conduit (205) passes through the nut sleeve (201) and extends to the inner wall of the inner circulation thread groove (202); an outer circulation thread groove (206) is provided on one side of the inner circulation thread groove (202) and on the inner wall of the nut sleeve (201).

5. The ball nut circulator according to claim 4, characterized in that: An outer circulation ball (207) is slidably connected to the inner wall of the outer circulation thread groove (206), and the outer circulation ball (207) is slidably connected to the outer wall of the screw rod (1). A guide tube (208) is installed on one side of the outer circulation ball (207) and located on the outer wall of the nut sleeve (201), and one end of the guide tube (208) passes through the nut sleeve (201) and extends to the inner wall of the outer circulation thread groove (206).

6. The ball nut circulator according to claim 5, characterized in that: The sealing assembly (3) comprises a sealing pad (301) and a sealing sleeve (302); the sealing pad (301) is mounted at the port of the nut sleeve (201) via bolts; a conical enclosure (303) is embedded and mounted on one side of the sealing pad (301) and located on the outer wall of the nut sleeve (201).

7. The ball nut circulator according to claim 6, characterized in that: A sealing sleeve (302) is installed at one end of the conical enclosure (303), and the sealing sleeve (302) is slidably connected to the outer wall of the screw rod (1), and an annular scraper (304) is embedded and installed on one side of the screw rod (1) and on the inner wall of the sealing sleeve (302).

8. The ball nut circulator according to claim 7, characterized in that: The inner circulation ball (203) and the conduit (205) are connected in a sliding manner, the outer circulation ball (207) and the guide tube (208) are connected in a sliding manner, the annular scraper (304) is made of rubber material, and sealing grease is provided between the sealing pad (301) and the sealing sleeve (302) and on the inner wall of the conical enclosure (303).

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