CN222963271U - Ball screw structure of embedded ball return device - Google Patents
Ball screw structure of embedded ball return device Download PDFInfo
- Publication number
- CN222963271U CN222963271U CN202422080423.0U CN202422080423U CN222963271U CN 222963271 U CN222963271 U CN 222963271U CN 202422080423 U CN202422080423 U CN 202422080423U CN 222963271 U CN222963271 U CN 222963271U
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- nut
- returning device
- bead returning
- groove
- cylindrical
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Abstract
The utility model discloses a ball screw structure with a bead returning device embedded, which comprises a nut and a screw shaft, wherein a central threaded hole is formed in the nut, the nut is in threaded fit with the screw shaft through the central threaded hole, a raceway groove is formed in the inner wall of the central threaded hole of the nut, a cylindrical groove is formed in the inner wall of the central threaded hole of the nut, the bead returning device is embedded in the cylindrical groove and is provided with a positioning groove, the bead returning device is radially positioned by matching a cylindrical pin or/and a set screw with the positioning groove, the outer side wall of the bead returning device is a cylindrical surface, a bead returning groove is formed in the inner side wall, and the bead returning groove is communicated with the raceway groove. The cylindrical surface on the outer side of the bead returning device is a positioning surface, the positioning contact surface is large, the impact resistance is good, the bead returning device is not easy to damage, and can bear higher rotating speed, the positioning surface of the bead returning device is easy to process, convenient to detect and convenient for quality control in mass production, the outer circumferential surface of the nut is not required to be damaged, and the use field is wider.
Description
Technical Field
The utility model belongs to the technical field of ball screws, and particularly relates to a ball screw structure with a ball return device embedded therein.
Background
The ball screw serves as a key element of a transmission device, plays a vital role in modern industrial production, and is commonly applied to driving the screw to rotate by taking a motor as an input, and then the nut moves linearly along with the rotation of the screw. The body shadow of various actuators, automation devices and conveying devices can be seen frequently. In addition, the ball screw has the characteristics of high precision, high efficiency, reversibility and the like, and has wide application in the fields of aerospace, precise detection, automobiles and the like.
The ball screw generally comprises parts such as a screw, a nut, a ball return device, a ball and the like, and is divided into an inner circulation structure and an outer circulation structure according to whether the ball is separated from the screw in the running process. The internal circulation structure is divided into an internal type and an external type, wherein the internal type is generally positioned by adopting the contact of a nut rollaway nest and 2 bosses extending out of a bead returning device, and the external type is generally positioned by processing a sinking groove on the outer circle of the nut. In addition, the diameter of 2 protruding bosses of the built-in bead returning device is smaller than that of balls, the contact area with the middle part of the bead returning device is smaller, and the phenomenon that the ball screw pair is blocked and fails due to breakage caused by insufficient strength of the protruding bosses under the working condition of high speed or high impact is easy to occur. After the externally-mounted ball returning device is installed in the nut sinking groove, filler is added between the ball returning device and the outer circle of the nut for fixing, and a glue beating mode is generally adopted, so that the ball screw pair is invalid due to the fact that glue is easy to fall off under the working conditions of high speed, high impact or high temperature. In addition, the outer circle of the nut is destroyed no matter the built-in type bead returning device or the external type bead returning device, which is very unfriendly to certain occasions needing to ensure the integrity of the outer surface of the nut, such as an actuating mechanism used in the automobile braking field, and the outer surface of the nut is generally not allowed to be destroyed due to the need of ensuring the tightness.
Therefore, how to solve the above-mentioned drawbacks of the prior art is a direction of efforts of those skilled in the art.
Disclosure of utility model
The utility model aims to provide a ball screw structure with an embedded ball return device, which can completely solve the defects in the prior art.
The aim of the utility model is achieved by the following technical scheme:
The utility model provides an embedded ball screw structure of pearl ware that returns, includes nut and screw arbor, sets up central screw hole on the nut, and the nut passes through central screw hole and screw arbor screw-thread fit, and this central screw hole inner wall is equipped with the raceway groove, the cylinder groove has been seted up to the central screw hole inner wall of nut correspondence raceway groove, inlays in the cylinder groove and establishes the pearl ware that returns, is equipped with the constant head tank at the pearl ware terminal surface that returns, carries out radial positioning to the pearl ware that returns through cylindric lock or/and holding screw and constant head tank cooperation, the lateral wall that returns the pearl ware is the face of cylinder, is equipped with the pearl groove that returns on the inside wall, returns pearl groove and raceway groove intercommunication.
Preferably, the inner bottom surface of the cylindrical groove is a cylindrical surface matched with the outer wall of the bead returning device, and the left side wall and the right side wall of the cylindrical groove are flat surfaces perpendicular to the central axis of the nut.
Preferably, the two ends of the nut are provided with pin holes communicated with the cylindrical grooves, cylindrical pins are matched in the pin holes, and the bottom ends of the cylindrical pins are matched in the positioning grooves.
Preferably, the coaxiality of the pin holes at the two ends of the nut is consistent.
Preferably, the pin hole end is provided with a thread section, and a set screw is fitted to the thread section.
Preferably, the set screw is coated with a thread compound.
Preferably, a plane is arranged at the top end of the outer wall of the bead returning device.
Compared with the prior art, the utility model has the beneficial effects that:
1. The cylindrical surface on the outer side of the bead returning device and the two side surfaces thereof are positioning surfaces, so that the positioning contact surface is large, the shock resistance is good, the bead returning device is not easy to damage, and the bead returning device can bear higher rotating speed;
2. the positioning surface of the bead returning device is easy to process, convenient to detect and convenient for quality control during mass production;
3. the outer circular surface of the nut is not required to be damaged, the application field is wider, and the method is particularly suitable for occasions needing to ensure the integrity of the outer surface of the nut.
Drawings
FIG. 1 is a schematic perspective view of the present utility model;
FIG. 2 is a cross-sectional view of the present utility model;
FIG. 3 is a diagram showing the relationship between the nut and the bead returning device in the present utility model;
FIG. 4 is a schematic perspective view of a nut according to the present utility model;
FIG. 5 is a schematic perspective view of a bead return device according to the present utility model;
FIG. 6 is a schematic view of another angle of the bead returning device according to the present utility model.
Detailed Description
The utility model will be further described with reference to specific examples and figures.
As shown in fig. 1 to 6, a ball screw structure of an embedded bead returning device comprises a nut 1 and a screw shaft 2, wherein a central threaded hole 3 is formed in the nut 1, the nut 1 is in threaded fit with the screw shaft 2 through the central threaded hole 3, a raceway groove is formed in the inner wall of the central threaded hole 3 of the nut 1, a cylindrical groove 4 is formed in the inner wall of the central threaded hole 3 of the nut 1, the bead returning device 5 is embedded in the cylindrical groove 4, the width of the cylindrical groove 4 is identical with the height of the cylindrical surface of the bead returning device 5, and the bead returning device 5 is axially positioned. The two side end surfaces of the bead returning device 5 are provided with positioning grooves 6, two ends of the nut 1 are provided with pin holes 7 which are communicated with the cylindrical grooves 4 along the axial direction, cylindrical pins 8 are matched in the pin holes 7, and the bottom ends of the cylindrical pins 8 are matched and abutted against the inner bottom surfaces of the positioning grooves 6 for radially positioning the bead returning device 5. The pin holes 7 may be slightly larger in size than the cylindrical pins 8 to eliminate the influence of machining errors. The end part of the pin hole 7 is provided with a thread section 9, and a set screw 10 is matched with the thread section 9 to prevent the cylindrical pin 8 from falling off. If the nut 1 is short in length, the cylindrical pin 8 may be omitted, and the bead returning device 5 may be directly fixed by the set screw 10.
The cylindrical grooves 4 are arranged in a plurality, the corresponding cylindrical grooves 4 are machined on the inner wall of the central threaded hole 3 of the nut 1 according to the number and the size of the bead returning devices 5, and a circumferential milling or boring machining mode can be adopted, and a cold heading forming mode can also be adopted.
The coaxiality of the pin holes 7 at the two ends of the nut 1 is consistent. Specifically, the pin holes 7 on two sides of the cylindrical groove 4 are preferably machined by drilling to the bottom, so that the coaxiality of the pin holes 7 on two ends can be ensured to be consistent, only one pin hole 7 on one end can be opened under the condition that the end face of one side is not allowed to be damaged, and a section of thread section 9 is machined on the top end of the pin hole 7.
The outer side wall of the ball return device 5 is a cylindrical surface 12, a ball return groove 11 is arranged on the inner side wall, and the ball return groove 11 is communicated with the raceway groove and used for circulating balls in the raceway groove.
In this embodiment, the inner bottom surface of the cylindrical groove 4 is a cylindrical surface matched with the outer wall of the bead returning device 5, and the left and right side walls of the cylindrical groove 4 are flat surfaces perpendicular to the central axis of the nut.
In some occasions with severe working conditions, the set screw 10 is coated with a thread compound for improving the strength of the set screw.
A plane is arranged at the top end of the outer wall of the bead returning device 5. Specifically, the bead returning device 5 may be formed by machining or powder metallurgy, and when the machining is adopted, in order to facilitate positioning of the bead returning device 5, a plane may be machined at the top end of the cylindrical surface 12 contacting with the cylindrical groove 4 of the nut 1, but care should be taken to control the size of the plane, so as to ensure that the bottom of the bead returning groove and the plane have a certain thickness.
The cylindrical surface 12 on the outer side of the bead returning device 5 and the two side surfaces thereof are positioning surfaces, the positioning contact surface is large, the impact resistance is good, the bead returning device is not easy to damage, and can bear higher rotating speed, the positioning surface of the bead returning device 5 is easy to process, convenient to detect and convenient for quality control in batch production, the outer circular surface of the nut 1 is not required to be damaged, the use field is wider, and the bead returning device is especially suitable for occasions needing to ensure the integrity of the outer surface of the nut.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (7)
1. The ball screw structure of the embedded bead returning device comprises a nut and a screw shaft, wherein a central threaded hole is formed in the nut, the nut is in threaded fit with the screw shaft through the central threaded hole, and a raceway groove is formed in the inner wall of the central threaded hole of the nut.
2. The ball screw structure of the embedded bead returning device of claim 1, wherein the inner bottom surface of the cylindrical groove is a cylindrical surface matched with the outer wall of the bead returning device, and the left side wall and the right side wall of the cylindrical groove are flat surfaces perpendicular to the central axis of the nut.
3. The ball screw structure of the embedded ball return device of claim 2, wherein the two ends of the nut are provided with pin holes communicated with the cylindrical grooves, cylindrical pins are matched in the pin holes, and the bottom ends of the cylindrical pins are matched in the positioning grooves.
4. The ball screw structure of the embedded bead returning device of claim 3, wherein the coaxiality of the pin holes at the two ends of the nut is consistent.
5. The ball screw structure of the embedded bead returning device as claimed in claim 4, wherein the end part of the pin hole is provided with a thread section, and a set screw is matched with the thread section.
6. The ball screw structure of the embedded bead returning device as claimed in claim 5, wherein the set screw is coated with a thread compound.
7. The ball screw structure of the embedded bead returning device as claimed in claim 6, wherein a plane is arranged at the top end of the outer wall of the bead returning device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202422080423.0U CN222963271U (en) | 2024-08-27 | 2024-08-27 | Ball screw structure of embedded ball return device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202422080423.0U CN222963271U (en) | 2024-08-27 | 2024-08-27 | Ball screw structure of embedded ball return device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222963271U true CN222963271U (en) | 2025-06-10 |
Family
ID=95903294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202422080423.0U Active CN222963271U (en) | 2024-08-27 | 2024-08-27 | Ball screw structure of embedded ball return device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222963271U (en) |
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2024
- 2024-08-27 CN CN202422080423.0U patent/CN222963271U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 200000 No. 69, Lane 660, Guanghua Road, Xiaokunshan Town, Songjiang District, Shanghai Patentee after: Xinjian Electromechanical Transmission (Shanghai) Co.,Ltd. Country or region after: China Address before: 200000 No. 69, Lane 660, Guanghua Road, Xiaokunshan Town, Songjiang District, Shanghai Patentee before: SHANGHAI SEENPIN ELECTROMECHANICAL TECHNOLOGY DEVELOPMENT CO.,LTD. Country or region before: China |