High-stability lead screw bearing

Abstract

The utility model discloses a high-stability lead screw bearing. The high-stability lead screw bearing comprises a lead screw shaft, a nut, a return cover plate, balls and an arc-shaped protective plate, a first spiral groove is formed in the outer peripheral surface of the screw shaft. A second spiral groove is formed in the inner circumferential face of the nut, the first spiral groove and the second spiral groove are matched with each other to form a lead screw roller path, a connecting groove communicated with the lead screw roller path is formed in the nut, and positioning clamping grooves are formed in the two sides of the nut. The return cover plate is inserted into the connecting groove, a return groove is formed in the inner side of the return cover plate, and the connecting groove and the return groove are matched to form a return roller path. And the balls are arranged on a circulating raceway formed by the lead screw raceway and the return raceway. The inner side wall of the arc-shaped protection plate abuts against the outer side wall of the nut so that the return cover plate can be prevented from being separated from the connecting groove, and blocking of the return cover plate is achieved. The arc-shaped protection plate is located on the side, close to the return cover plate, of the nut, positioning buckles matched with the positioning clamping grooves are arranged on the two sides of the arc-shaped protection plate, and the arc-shaped protection plate and the nut are connected and fixed.

Description

Technical Field

[0001] The utility model belongs to the technical field of screw bearings, and in particular relates to a high-stability screw bearing. Background Art

[0002] Ball screw bearings are a type of bearing consisting of a screw, a nut, a reverse device and balls, which is used to convert rotary motion into linear motion or convert linear motion into rotary motion.

[0003] The balls in the ball screw bearing are installed from the outside of the bearing. After being placed, the ball placement port needs to be closed by a return cover to ensure that the balls can roll back and forth in the bearing. After the return cover seals the ball placement port, in order to prevent the return cover from detaching from the nut, most of the current methods use a cylindrical shell to cover the outside of the bearing nut for sealing. However, this sealing method will greatly increase the weight of the bearing nut, and the cylindrical shell is basically the same size as the bearing nut, which increases the production cost. Utility Model Content

[0004] In view of the above shortcomings, the utility model provides a high-stability screw bearing, which provides a positioning slot on the outside of the nut and uses an arc-shaped guard plate to cooperate with the positioning slot to prevent the return cover from falling off. Compared with the cylindrical shell, the weight of the bearing is greatly reduced and the production cost is reduced. The arc-shaped guard plate is installed on the outside of the nut by a snap-on method, which is convenient for disassembly and assembly.

[0005] The utility model is realized by the following technical solutions:

[0006] A high-stability screw bearing comprises a screw shaft, a nut, a return cover plate, a ball and an arc-shaped guard plate. The screw shaft is formed with a first spiral groove on its outer circumference. The nut is formed with a second spiral groove on its inner circumference. The first spiral groove and the second spiral groove cooperate with each other to form a screw raceway. A connecting groove connected to the screw raceway is provided in the nut, and positioning slots are provided on both sides of the nut. The return cover plate is plugged into the connecting slot, and a return groove is formed on the inner side of the return cover plate. The connecting groove and the return groove cooperate to form a return raceway. The outer side wall of the return cover plate and the outer side wall of the nut are on the same circumferential surface. The ball is arranged on the circulating raceway formed by the screw raceway and the return raceway. The inner side wall of the arc-shaped guard plate abuts against the outer side wall of the nut to prevent the return cover plate from being separated from the connecting slot, thereby blocking the return cover plate. The arc-shaped guard plate is located on the side of the nut close to the return cover plate, and both sides of the arc-shaped guard plate have positioning buckles that cooperate with the positioning slots to achieve the connection and fixation of the arc-shaped guard plate and the nut.

[0007] Furthermore, the positioning slot includes an L-shaped slot and a first straight slot, the L-shaped slot includes a second straight slot and a plug-in slot, the width of the plug-in slot is greater than the width of the second straight slot, and the first straight slot is connected to the bottom end of the nut. The L-shaped slot and the first straight slot act together on the positioning buckle of the arc guard plate to enhance the connection stability between the arc guard plate and the nut.

[0008] Furthermore, the side walls of the first straight groove and the second straight groove are both provided with positioning grooves, and a positioning protrusion is provided on the side of the positioning buckle close to the positioning groove to achieve the snap-fitting cooperation between the positioning groove and the positioning buckle, thereby preventing the arc-shaped guard plate from being detached from the nut after being snapped to the outside of the nut.

[0009] Furthermore, two sets of positioning buckles are provided on both sides of the arc-shaped guard plate to improve the stability of the connection between the arc-shaped guard plate and the bolts.

[0010] Furthermore, the arc-shaped guard plate is made of aluminum alloy material, which is a lightweight material and helps to reduce the weight of the bearing.

[0011] Furthermore, on the cross section of the nut, assuming that the arc length of the return cover is L and the arc length of the arc guard is l, then L<l<2L. By limiting the length of the arc guard, it is avoided that the arc guard is too long and the total weight of the bearing is excessively increased.

[0012] Furthermore, the surfaces of the positioning groove and the positioning protrusion are coated with Teflon coating. The Teflon coating has a low friction coefficient and good wear resistance, which helps to increase the service life of the arc guard plate and the nut.

[0013] Furthermore, a threaded connection portion is fixed to the front end of the nut to facilitate connection with other components and facilities, thereby giving full play to the role of the screw bearing.

[0014] Beneficial effects of the utility model:

[0015] 1. By opening a positioning slot on the outside of the nut and using an arc-shaped guard plate to cooperate with the positioning slot, the return cover plate is prevented from falling off. Compared with setting a cylindrical shell, the weight of the bearing is greatly reduced and the production cost is reduced;

[0016] 2. The arc-shaped guard plate is installed to the outside of the nut by snap-fitting, which is convenient for disassembly and assembly and has high stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A connection diagram for illustrating a schematic implementation of a nut of a high-stability lead screw bearing in the utility model;

[0018] Figure 2 A structural schematic diagram for illustrating a schematic implementation of a nut of a high-stability lead screw bearing in the utility model;

[0019] Figure 3 A side view for illustrating a schematic implementation of a nut of a high-stability screw bearing in the utility model;

[0020] Figure 4 A cross-sectional view for illustrating a schematic implementation of a nut of a high-stability screw bearing in the utility model;

[0021] Figure 5 A structural schematic diagram for illustrating a schematic implementation of a nut of a high-stability screw bearing in a cut-away state in the utility model;

[0022] Figure 6 A structural schematic diagram for illustrating another exemplary embodiment of a nut of a high-stability screw bearing in a cut-away state in the utility model;

[0023] Figure 7 A structural schematic diagram for illustrating a schematic implementation of a return cover plate of a high-stability screw bearing in the utility model.

[0024] List of parts and reference numerals:

[0025] 1. Nut; 11. Second spiral groove; 12. Connecting groove; 13. Positioning slot; 131. L-shaped slot; 1311. Second straight slot; 1312. Second straight slot; 132. First straight slot; 133. Positioning groove; 14. Connecting part; 2. Return cover plate; 21. Return slot; 3. Arc-shaped guard plate; 31. Positioning buckle. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] It should be noted that the directional terms such as left, right, up, down, front and back in the embodiments of the present invention are merely relative concepts or are based on the normal use state of the product, that is, the direction of movement of the product, and should not be considered as limiting.

[0028] In addition, it should be noted that the dynamic terms such as "relative motion" mentioned in the embodiments of the present invention are not only changes in position, but also include movements such as rotation and rolling where there is no relative change in position but a change in state.

[0029] Finally, it should be noted that when a component is referred to as being "located" or "set on" another component, it can be on the other component or there can be an intermediate component at the same time. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there can be an intermediate component at the same time.

[0030] like Figures 1 to 7 A high-stability screw bearing is shown, comprising a screw shaft, a nut 1, a return cover plate 2, balls and an arc-shaped guard plate 3. The screw shaft is formed with a first spiral groove on its outer circumference. The nut 1 is formed with a second spiral groove 11 on its inner circumference, and the first spiral groove and the second spiral groove 11 cooperate with each other to form a screw raceway. A connecting groove 12 connected to the screw raceway is provided in the nut 1, and positioning slots 13 are provided on both sides of the nut 1. The return cover plate 2 is plugged into the connecting groove 12, and a return groove 21 is formed on the inner side of the return cover plate 2. The connecting groove 12 and the return groove 21 cooperate to form a return raceway, and the outer side wall of the return cover plate 2 is on the same circumferential surface as the outer side wall of the nut 1. The balls are arranged on the circulating raceway formed by the screw raceway and the return raceway. The inner side wall of the arc-shaped guard plate 3 abuts against the outer side wall of the nut 1 to prevent the return cover plate 2 from being separated from the connecting groove 12, thereby blocking the return cover plate 2. The arc-shaped guard plate 3 is located on one side of the nut 1 close to the return cover plate 2 , and both sides of the arc-shaped guard plate 3 are provided with positioning buckles 31 that cooperate with the positioning slots 13 to achieve the connection and fixation between the arc-shaped guard plate 3 and the nut 1 .

[0031] In one embodiment, when installing the screw bearing, first, the screw shaft is inserted into the nut 1, and the first spiral groove and the second spiral groove 11 are matched with each other. Then, a number of balls are filled into the screw raceway formed by the first spiral groove and the second spiral groove 11 from the connecting groove 12 on the outside of the nut 1. After the balls are filled, the return cover plate 2 is inserted into the connecting groove 12, and the return groove 21 on the inner side of the return cover plate 2 is docked with the connecting groove 12 to form a return raceway, and the return raceway and the screw raceway are connected to form a circulation raceway. Finally, the inner arc surface of the arc guard plate 3 is abutted against the outer wall of the nut 1, and the arc guard plate 3 is pushed in the axial direction of the nut 1 to achieve the docking of the positioning buckle 31 with the positioning groove 13, that is, the arc guard plate 3 is installed on the outside of the nut 1. Compared with the existing cylindrical shell, the arc guard plate 3 is smaller in volume and weight, and the arc guard plate 3, like the cylindrical shell, can prevent the return cover plate 2 from being separated from the plug-in groove.

[0032] In one embodiment, when in use, the screw shaft or the nut 1 is rotated, and the balls located in the circulating raceway are displaced along the circulating raceway, thereby achieving axial displacement of the nut 1 relative to the screw shaft.

[0033] Preferably, the positioning slot 13 includes an L-shaped slot 131 and a first straight slot 132, the L-shaped slot 131 includes a second straight slot 1311 and a plug-in slot, the width of the plug-in slot is greater than the width of the second straight slot 1311, and the first straight slot 132 is connected to the bottom end of the nut 1. The L-shaped slot 131 and the first straight slot 132 act together on the positioning buckle 31 of the arc-shaped guard plate 3 to enhance the connection stability between the arc-shaped guard plate 3 and the nut 1.

[0034] In one embodiment, when the arc-shaped guard plate 3 is installed to the outer wall of the nut 1, first, the inner wall of the arc-shaped guard plate 3 is abutted against the outer wall of the nut 1, and then the positioning buckle 31 of the arc-shaped guard plate 3 is inserted into the insertion groove of the L-shaped groove 131, and the arc-shaped guard plate 3 is rotated so that the positioning buckle 31, the first straight groove 132 and the second straight groove 1311 are located on the same straight line. Then, the arc-shaped guard plate 3 is pushed along the axial direction of the nut 1, so that the positioning buckle 31 of the arc-shaped guard plate 3 is clamped to the first straight groove 132 and the second straight groove 1311. The clamping installation of the arc-shaped guard plate 3 is realized, which is convenient and quick.

[0035] Preferably, the side walls of the first straight groove 132 and the second straight groove 1311 are both provided with a positioning groove 133, and the side of the positioning buckle 31 close to the positioning groove 133 is provided with a positioning protrusion to achieve the snap-fitting fit between the positioning groove 13 and the positioning buckle 31 to prevent the arc-shaped guard plate 3 from detaching from the nut 1 after being snapped to the outside of the nut 1.

[0036] In one embodiment, when the positioning buckle 31 is pushed to the first straight groove 132 and the second straight groove 1311, when the positioning buckle 31 moves to the edge of the first straight groove 132 and the second straight groove 1311, the positioning protrusion on the positioning buckle 31 falls into the positioning groove 133, so that the positioning buckle 31 and the positioning groove 13 are connected. It should be noted that the arc cover plate has a certain bending deformation ability, and the height of the positioning protrusion is less than the thickness of the arc cover plate. When the arc cover plate is plugged into the positioning groove 13, the arc cover plate will be slightly deformed. When the positioning protrusion is located at the positioning groove 133, the arc cover plate will shrink, so that the positioning protrusion is embedded in the positioning groove 133.

[0037] Preferably, two sets of positioning buckles 31 are provided on both sides of the arc-shaped guard plate 3 to improve the stability of the connection between the arc-shaped guard plate 3 and the bolts.

[0038] Preferably, the arc-shaped guard plate 3 is made of aluminum alloy material, which is a lightweight material and helps to reduce the weight of the bearing.

[0039] Preferably, on the cross section of the nut 1, assuming that the arc length of the return cover plate 2 is L and the arc length of the arc guard plate 3 is l, then L<l<2L. By limiting the length of the arc guard plate 3, it is avoided that the arc guard plate 3 is too long and the total weight of the bearing is excessively increased.

[0040] In one embodiment, the matching arc-shaped guard plate 3 can be set according to the arc length of the return cover plate 2, and it is only necessary to ensure that the arc length of the arc-shaped guard plate 3 is greater than the arc length of the return cover plate 2. Under the premise of ensuring that the arc length of the arc-shaped cover plate is greater than the arc length of the return cover plate 2, the shorter the arc length of the arc-shaped cover plate, the lower the weight of the arc-shaped cover plate, the lower the weight of the entire bearing, the lower the manufacturing cost of the bearing, and the higher the quality of the bearing.

[0041] Preferably, the surfaces of the positioning groove 13 and the positioning protrusion are coated with Teflon coating. Teflon coating has a low friction coefficient and good wear resistance, which helps to improve the service life of the arc guard plate 3 and the nut 1.

[0042] Preferably, a threaded connection portion 14 is also fixed to the front end of the nut 1 to facilitate connection with other components and facilities, thereby giving full play to the role of the screw bearing.

[0043] In one embodiment, the threaded connection portion 14 at the front end of the nut 1 is used to connect to an external device using a screw bearing, thereby improving the convenience of connection.

[0044] When the above-mentioned high-stability screw bearing is used, a positioning slot 13 is provided on the outside of the nut 1, and an arc-shaped guard plate 3 is used to cooperate with the positioning slot 13 to prevent the return cover plate 2 from falling off. Compared with the cylindrical shell, the weight of the bearing is greatly reduced, and the production cost is reduced. The arc-shaped guard plate 3 is installed on the outside of the nut 1 by a snap-fit ​​method, which is convenient for disassembly and assembly.

[0045] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A high stability screw bearing, characterized in that: include: A screw shaft having a first spiral groove formed on an outer peripheral surface thereof; A nut, wherein a second spiral groove is formed on an inner circumferential surface of the nut, the first spiral groove and the second spiral groove cooperate with each other to form a screw raceway, a connecting groove connected to the screw raceway is formed in the nut, and positioning grooves are formed on both sides of the nut; A return cover plate, the return cover plate is plugged into the connection groove, a return groove is formed on the inner side of the return cover plate, the connection groove and the return groove cooperate to form a return raceway, and the outer side wall of the return cover plate and the outer side wall of the nut are on the same circumferential surface; Balls, the balls are arranged on a circulating raceway formed by the screw raceway and the return raceway; An arc-shaped guard plate, wherein the inner side wall of the arc-shaped guard plate abuts against the outer side wall of the nut, the arc-shaped guard plate is located on the side of the nut close to the return cover plate, and both sides of the arc-shaped guard plate have positioning buckles that cooperate with the positioning slots.

2. A high stability screw bearing according to claim 1, characterized in that: The positioning slot includes an L-shaped slot and a first straight slot, the L-shaped slot includes a second straight slot and an inserting slot, the width of the inserting slot is greater than the width of the second straight slot, and the first straight slot is connected to the bottom end of the nut.

3. A high stability screw bearing according to claim 2, characterized in that: The side walls of the first straight groove and the second straight groove are both provided with positioning grooves, and the positioning buckle is provided with a positioning protrusion on one side close to the positioning groove.

4. A high stability screw bearing according to claim 1, characterized in that: Two sets of positioning buckles are provided on both sides of the arc-shaped guard plate.

5. A high stability screw bearing according to claim 1, characterized in that: The arc-shaped guard plate is made of aluminum alloy material.

6. A high stability screw bearing according to claim 1, characterized in that: On the cross section of the nut, assuming that the arc length of the return cover plate is L, and the arc length of the arc-shaped guard plate is l, then L<l<2L.

7. A high stability screw bearing according to claim 3, characterized in that: The surfaces of the positioning groove and the positioning protrusion are coated with Teflon coating.

8. The high stability screw bearing according to claim 1, characterized in that: A threaded connection portion is also fixed to the front end of the nut.

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