Ball screw pair with staggered ball nut

Abstract

The utility model relates to the technical field of ball screw pairs, in particular to a ball screw pair with a staggered ball nut, which comprises a threaded screw, the outer wall of the threaded screw is slidably connected with a nut sleeve, the inner wall of the nut sleeve is provided with a threaded groove, and the inner wall of the threaded groove is slidably connected with a ball. The balls are slidably connected to the outer wall of the threaded lead screw, and a circulating shell is arranged on the portion, located on the outer wall of the nut sleeve, of one side of each ball. According to the utility model, the cover plate is opened, and then lubricating oil is injected into the inner cavity of the circulating shell, so that the lubricating oil can be uniformly spread out when the balls roll circularly; the belleville springs apply axial pressure to the balls through the sliding beads, the contact area between the balls and the sliding beads is small, and the sliding beads are in sliding connection with the balls, so that the abrasion of the balls is further reduced, the service life of the device is prolonged, and the practicability is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of ball screw pair, specifically to a ball screw pair with staggered ball nuts. BACKGROUND

[0002] Ball screw pair as a kind of precision transmission device for converting rotary motion into linear motion, while transmitting power, it can ensure that accurate relative displacement is realized between screw rod and nut. One of its significant features is that it has a low friction coefficient, which makes ball screw pair become the ideal choice widely used in many high-precision mechanical equipment and instruments. However, in the actual application process, when the nut is subjected to frequent linear reciprocating motion along the screw rod, the entire system may become unstable due to the work done. The ball screw pair commonly seen on the market is not fully considered in the lubrication requirement of the ball. The ball and screw rod in this working state for a long time not only affects the performance of the equipment, but also may shorten the service life. For example, the prior art represented by a ball screw nut pair (publication number CN203413062U) sets the screw rod and the left nut and the right nut installed on the screw rod, the left nut and the right nut are provided with a sleeve on the outside, the end of the left nut and the sleeve is connected with an end cover, and the inside of the end cover is clamped with a butterfly spring with pre-tightening effect. The beneficial effects of the utility model are: under the pre-tightening effect of the butterfly spring, the two end nuts always press the ball towards the opposite side of the screw rod ball groove with a certain pressure, and always maintain the zero axial gap state of the ball screw pair, thereby effectively solving the problems of the prior art. However, the structure still needs to be improved, as follows:

[0003] In this scheme, the surface of the butterfly spring and the contact surface of the ball are large, and the butterfly spring also exerts downward pressure on the ball, which will cause the surface of the ball to be worn, affecting the service life of the device. Therefore, a ball screw pair with staggered ball nuts is needed to improve the above problems. UTILITY MODEL CONTENTS

[0004] In order to solve the problem that the surface of the butterfly spring and the contact surface of the ball are large, and the butterfly spring also exerts downward pressure on the ball, which will cause the surface of the ball to be worn, affecting the service life of the device when the ball screw pair is used, the utility model provides a ball screw pair with staggered ball nuts to solve the above problems.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] A ball screw pair with an offset ball nut comprises a threaded screw, a nut sleeve being slidably connected to the outer wall of the threaded screw, a threaded groove being provided on the inner wall of the nut sleeve, a ball being slidably connected to the inner wall of the threaded groove, the ball being slidably connected to the outer wall of the threaded screw, a circulation shell being provided on one side of the ball and located on the outer wall of the nut sleeve, a cover plate being embedded in the outer wall of the circulation shell, and connecting pipes being respectively provided on the opposite outer walls of the circulation shell, wherein one end of the connecting pipe is plugged in and installed on the outer wall of the circulation shell, and the other end of the connecting pipe passes through the nut sleeve and extends to the inner wall of the threaded groove, and the connection method between the ball and the connecting pipe is a sliding connection.

[0007] As a preferred solution of the present invention, a mounting groove is provided on the other side of the ball and on the inner wall of the nut sleeve.

[0008] As a preferred solution of the present invention, a limiting component is installed on the inner wall of the installation groove, and the limiting component includes a fixed shell.

[0009] As a preferred solution of the present invention, the fixed housing is embedded in the inner wall of the mounting groove.

[0010] As a preferred solution of the present invention, a butterfly spring is installed on the inner wall of the fixed shell.

[0011] As a preferred solution of the present invention, a sliding bead is installed on one side of the butterfly spring and at the port of the fixed housing.

[0012] As a preferred solution of the present invention, the sliding bead and the fixed housing are connected in a sliding manner.

[0013] As a preferred solution of the present invention, the sliding ball and the rolling ball fit each other and are connected by sliding connection, and the fixed housing is located on one side of the threaded screw.

[0014] Compared with the prior art, the present invention provides a cover plate on the outer wall of the circulation housing in a ball screw pair with an offset ball nut. When the ball moves in a circulation, the ball slides into the circulation housing through the connecting pipe. When lubricating oil needs to be added, the cover plate is opened and the lubricating oil is then injected into the inner cavity of the circulation housing. When the ball rolls in a circulation, the lubricating oil can be evenly spread, thereby solving the problem that the design of the ball screw pair does not fully consider the lubrication needs of the ball, and the ball and screw are in this working state for a long time, which not only affects the performance of the equipment, but also may shorten the service life.

[0015] The utility model can realize that the butterfly spring limits the ball through the sliding ball through the limiting component in the ball screw pair with the offset ball nut. The butterfly spring applies axial pressure to the ball through the sliding ball. The contact area between the ball and the sliding ball is small, and the sliding connection between the sliding ball and the ball further reduces the wear of the ball, extends the service life of the device, and is more practical, thereby solving the problem that the contact area between the surface of the butterfly spring and the ball is large, and the butterfly spring also applies downward pressure on the ball, which causes the surface of the ball to be worn and affects the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a side structural diagram of the present utility model;

[0018] Figure 3 This is a schematic diagram of the nut sleeve structure analysis of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the limit component of the utility model;

[0020] Figure 5 For this utility model Figure 4 A magnified schematic diagram of the A structure.

[0021] In the figure: 1. Threaded screw; 2. Nut sleeve; 3. Threaded groove; 4. Ball; 5. Circulation housing; 6. Cover plate; 7. Connecting pipe; 8. Mounting groove; 9. Limiting assembly; 901. Fixed housing; 902. Butterfly spring; 903. Sliding ball. DETAILED DESCRIPTION

[0022] 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.

[0023] Example: See Figure 1-5The ball screw pair shown has an offset ball nut, including a threaded screw 1, a nut sleeve 2 is slidingly connected to the outer wall of the threaded screw 1, a threaded groove 3 is opened on the inner wall of the nut sleeve 2, a ball 4 is slidingly connected to the inner wall of the threaded groove 3, and the ball 4 is slidingly connected to the outer wall of the threaded screw 1, a circulation shell 5 is provided on one side of the ball 4 and located on the outer wall of the nut sleeve 2, a cover plate 6 is embedded in the outer wall of the circulation shell 5, and connecting pipes 7 are respectively provided on the opposite outer walls of the circulation shell 5, wherein one end of the connecting pipe 7 is plugged in and installed on the outer wall of the circulation shell 5, and the other end of the connecting pipe 7 passes through the nut sleeve 2 and extends to the inner wall of the threaded groove 3, and the connection method between the ball 4 and the connecting pipe 7 is a sliding connection.

[0024] In this embodiment, specific reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 , a mounting groove 8 is provided on the other side of the ball 4 and on the inner wall of the nut sleeve 2, and a limit assembly 9 is installed on the inner wall of the mounting groove 8. The limit assembly 9 includes a fixed shell 901, and the fixed shell 901 is embedded in the inner wall of the mounting groove 8. A butterfly spring 902 is installed on the inner wall of the fixed shell 901, and a sliding ball 903 is installed on one side of the butterfly spring 902 and at the port of the fixed shell 901. The connection between the sliding ball 903 and the fixed shell 901 is a sliding connection, and the sliding ball 903 and the ball 4 fit together and the connection between the sliding ball 903 and the ball 4 is a sliding connection. The fixed shell 901 is located on one side of the threaded screw 1;

[0025] Based on the above-mentioned structural features and connection relationship, the butterfly spring 902 is on the inner wall of the fixed shell 901, and the butterfly spring 902 is arranged in multiple groups from top to bottom. At the same time, the sliding balls 903 are arranged in multiple groups from top to bottom and are respectively located at one end of the butterfly spring 902. When the ball 4 and the sliding ball 903 contact each other, the sliding ball 903 applies extrusion force to the ball 4 from three directions of top, middle and bottom, thereby making the sliding ball 903 have a better limiting effect on the ball 4.

[0026] When the ball screw pair of the present invention has a staggered ball nut, a thread groove 3 is opened on the inner wall of the nut sleeve 2, and a ball 4 is slidably connected to the inner wall of the thread groove 3. Under the action of the ball 4 slidingly connected to the outer wall of the threaded screw 1, when the nut sleeve 2 is used, the nut sleeve 2 slides up and down on the outer wall of the threaded screw 1 through the ball 4. At the same time, connecting pipes 7 are respectively provided on the opposite outer walls of the circulation shell 5, wherein one end of the connecting pipe 7 is plugged and installed on the outer wall of the circulation shell 5, and the other end of the connecting pipe 7 passes through the nut sleeve 2 and extends to the inner wall of the thread groove 3. When When the ball 4 moves in a circulation, the ball 4 will slide into the circulation housing 5 through the connecting tube 7. When lubricating oil needs to be added, a circulation housing 5 is provided on one side of the ball 4 and on the outer wall of the nut sleeve 2. Under the action of the cover plate 6 embedded in the outer wall of the circulation housing 5, the cover plate 6 is opened and the lubricating oil is then injected into the inner cavity of the circulation housing 5. When the ball 4 rolls in a circulation, the lubricating oil can be evenly spread, thereby solving the problem that the design of the ball screw pair does not fully consider the lubrication needs of the ball. The ball and the screw are in this working state for a long time, which will not only affect the performance of the equipment, but also shorten the service life.

[0027] The fixed housing 901 is embedded in the inner wall of the mounting groove 8. Under the action of the butterfly spring 902 installed on the inner wall of the fixed housing 901, the nut sleeve 2 always presses the ball 4 to the opposite side of the thread groove 3 with a certain pressure through the butterfly spring 902, and always maintains the zero axial clearance state of the threaded screw 1. Even if the threaded screw 1 is partially worn during use, the axial clearance between the threaded screw 1 and the ball 4 can always be automatically kept at zero. At the same time, a sliding ball 903 is installed on one side of the butterfly spring 902 and at the port of the fixed housing 901. The connection between the sliding ball 903 and the fixed housing 901 is a sliding connection. The ball 903 and the ball 4 fit together and the connection between the sliding ball 903 and the ball 4 is a sliding connection. Under the action of the fixed shell 901 on one side of the threaded screw 1, the butterfly spring 902 applies axial pressure to the ball 4 through the sliding ball 903. The contact area between the ball 4 and the sliding ball 903 is small, and the sliding connection between the sliding ball 903 and the ball 4 further reduces the wear of the ball 4, extends the service life of the device, and is more practical, thereby solving the problem of the large contact area between the surface of the butterfly spring and the ball. At the same time, the butterfly spring also applies downward pressure on the ball, which will cause the surface of the ball to be worn, affecting the service life of the device.

[0028] 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 screw pair with a staggered ball nut, comprising a threaded screw (1), characterized in that: A nut sleeve (2) is slidably connected to the outer wall of the threaded screw (1), a thread groove (3) is provided on the inner wall of the nut sleeve (2), a ball (4) is slidably connected to the inner wall of the thread groove (3), and the ball (4) is slidably connected to the outer wall of the threaded screw (1), a circulation shell (5) is provided on one side of the ball (4) and located on the outer wall of the nut sleeve (2), a cover plate (6) is embedded in the outer wall of the circulation shell (5), and connecting pipes (7) are respectively provided on the opposite outer walls of the circulation shell (5), wherein one end of the connecting pipe (7) is plugged and installed on the outer wall of the circulation shell (5), and the other end of the connecting pipe (7) passes through the nut sleeve (2) and extends to the inner wall of the thread groove (3), and the connection method of the ball (4) and the connecting pipe (7) is a sliding connection.

2. A ball screw pair with a staggered ball nut according to claim 1, characterized in that: A mounting groove (8) is provided on the other side of the ball (4) and on the inner wall of the nut sleeve (2).

3. The ball screw pair with staggered ball nuts according to claim 2, characterized in that: A limiting assembly (9) is installed on the inner wall of the installation groove (8), and the limiting assembly (9) includes a fixed housing (901).

4. The ball screw pair with staggered ball nuts according to claim 3, characterized in that: The fixed housing (901) is embedded in the inner wall of the mounting groove (8).

5. The ball screw pair with staggered ball nuts according to claim 3, characterized in that: A butterfly spring (902) is installed on the inner wall of the fixed housing (901).

6. The ball screw pair with staggered ball nuts according to claim 5, characterized in that: A sliding bead (903) is installed on one side of the butterfly spring (902) and at the port of the fixed housing (901).

7. The ball screw pair with staggered ball nuts according to claim 6, characterized in that: The sliding bead (903) and the fixed housing (901) are connected in a sliding manner.

8. The ball screw pair with staggered ball nuts according to claim 7, characterized in that: The sliding ball (903) and the rolling ball (4) fit together and are connected in a sliding manner. The fixed housing (901) is located on one side of the threaded screw (1).

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