A reverser and ball screw

Abstract

The utility model discloses a kind of reversers and ball screws, it is related to ball screw pair technical field;For with the return channel of the circulation rolling of ball of ball nut internal communication formation, including reverser body, reverser body is set up along length direction and is used to form the return channel's return rotary groove;The two sides of reverser body along width direction are connected with the die body, the side of die body along height direction can extend and protrude in return rotary groove preset height, to be inserted and connected in ball nut;The length direction of return rotary groove two ends respectively extends preset distance towards return channel, so that the length direction of return rotary groove two ends respectively forms the first guide part and second guide part for guiding ball into return rotary groove, which can be connected with return channel.

Description

Technical Field

[0001] This utility model belongs to the technical field of ball screw pairs, specifically relating to a reverser and a ball screw. Background Technology

[0002] When a ball screw is working, the balls roll in the threaded raceways of the nut and the screw. When the balls move to one end of the nut, the reverser guides the balls from the load area (working raceway) to the non-load area (return raceway) through a specific guide channel, forming a closed loop path, so that the balls can continuously participate in the transmission and avoid jamming or falling off.

[0003] When connecting a traditional ball nut and a reversing device, dimensional discrepancies between the channels for accommodating the balls in the reversing device and the channels for accommodating the balls in the ball nut can lead to an uneven connection. This can cause the balls to collide with the reversing device as they enter from the ball nut, resulting in contact between the two devices. This not only causes abnormal noise but also leads to mutual wear, which is detrimental to long-term use. Furthermore, the reversing device is typically inserted directly into the positioning hole of the ball nut to form an interference fit, making installation and disassembly inconvenient. After prolonged use, the connection between the ball nut and the reversing device can loosen, and the upward movement of the balls as they pass through the reversing device further contributes to this loosening. Utility Model Content

[0004] This utility model provides a reversing device and a ball screw to solve the problem that when there is a dimensional deviation between the channel for accommodating the balls in the reversing device and the channel for accommodating the balls in the ball nut, the connection between the channels is not smooth enough. During the process of the balls entering the reversing device from the ball nut, they are prone to colliding with the reversing device, causing contact between the reversing device and the ball nut. This not only causes abnormal noise, but also causes mutual wear between the reversing device and the ball nut, which is not conducive to long-term use.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A reverser for communicating with the inside of a ball nut to form a return channel for the ball to circulate and roll, includes a reverser body, the reverser body having a return rotation groove along its length for forming the return channel; and a draft body connected to both sides of the reverser body along its width, one side of the draft body being able to extend and protrude beyond a preset height of the return rotation groove for insertion and connection to the ball nut.

[0007] The two ends of the return rotary groove extend towards the return channel by a predetermined distance, so that the two ends of the return rotary groove form a first guide part and a second guide part that can connect with the return channel to guide the balls into the return rotary groove.

[0008] A cover plate is connected to the other side of the draft mold along the height direction.

[0009] The draft mold body and the cover plate are integrated into one structure; or, the draft mold body and the cover plate are detachably connected.

[0010] The bottom surface of the cover plate is connected to the bottom surface of the reversing device body, and can be coplanar with the outer circumferential surface of the ball nut after the ball nut is inserted into the reversing device.

[0011] Along the width direction of the reverser, the width dimension of the cover plate is greater than the width dimension of the draft die, so that the cover plate has a stepped structure that protrudes outward by a preset distance along the width direction of the reverser body, and is connected to the stepped hole of the ball nut through the step structure.

[0012] The reversing rotary groove extends in an S-shaped curve along the length of the reversing body, and in a U-shaped curve along the height of the reversing body.

[0013] The inner side of the draft die facing the return rotary groove forms a smooth transition connection with the curved surface of the return rotary groove. The outer side of the draft die facing away from the return rotary groove has an arc-shaped transition surface for the positioning hole for inserting the ball nut. The top surface of the draft die facing away from the cover plate forms a spirally distributed curved surface.

[0014] The arc-shaped transition surface of the draft die is provided with elastic protrusions. The positioning hole of the ball nut is connected to the corresponding position of the elastic protrusions, so that when the draft die is inserted into the positioning hole, the compressed elastic protrusions can engage with the grooves, thereby achieving a tight connection between the reverser and the positioning hole.

[0015] This application also relates to a ball screw, which, according to the above-described reverser, includes a screw, a ball nut, balls, and a reverser.

[0016] The ball nut is connected to the outer periphery of the lead screw. The lead screw has a first helical groove for the rolling of multiple balls. The ball nut has a second helical groove corresponding to the first helical groove. The first helical groove and the second helical groove cooperate to form a rolling track for accommodating the rolling of the balls. The ball nut is provided with a positioning hole, and the reverser is connected to the ball nut through the positioning hole.

[0017] The first guide part of the reversing rotary groove of the reverser can be connected to the first end of the rolling track, and the second guide part of the reversing rotary groove can be connected to the second end of the rolling track, so that the reversing rotary groove and the rolling track are connected to form a circulation channel for the reciprocating movement of the balls.

[0018] Due to the adoption of the above technical solution, the beneficial effects achieved by this utility model are as follows:

[0019] 1. This application relates to a reverser for communicating with the inside of a ball nut to form a return channel for the cyclic rolling of balls. The reverser includes a reverser body with a reversing rotary groove along its length for forming the return channel. Two draft bodies are connected to both sides of the reverser body along its width. One side of the draft body along its height can extend and protrude beyond a predetermined height of the reversing rotary groove for insertion into the ball nut. The two ends of the reversing rotary groove extend a predetermined distance toward the return channel, such that the two ends of the reversing rotary groove respectively form a first guide portion and a second guide portion that can connect with the return channel to guide the balls into the reversing rotary groove.

[0020] This application not only has draft bodies connected to both sides of the reverser body along the width direction, but also has one side of the draft body extending and protruding beyond a preset height of the return rotary groove to be inserted into and connected to the ball nut, increasing the locking area between the reverser and the ball nut, increasing the friction between them, and preventing the reverser from disengaging from the positioning hole; moreover, the two ends of the return rotary groove in this application extend towards the return channel by a preset distance, so that the two ends of the return rotary groove in the length direction respectively form a first guide part and a second guide part that can connect with the return channel to guide the ball into the return rotary groove; this enhances the smoothness and stability of the ball entering the return rotary groove from the return channel, improves the running stability of the entire circulation channel, avoids collisions and wear between the reverser and the ball nut, improves the user experience and the service life of the reverser.

[0021] 2. In a preferred embodiment of the present invention, the bottom surface of the cover plate is connected to the bottom surface of the reverser body, and can be coplanar with the outer circumferential surface of the ball nut after the ball nut is inserted into the reverser.

[0022] The bottom surface of the cover plate can have a certain concave surface. The bottom surface of the cover plate is concave to the outer peripheral surface of the inverter to prevent the cover plate from protruding on the outer peripheral surface of the inverter body, which would be not conducive to assembly. Alternatively, the bottom surface of the cover plate can be an arc surface. When the cover plate is connected to the positioning hole of the ball nut and covers the positioning hole, it can form a coplanar structure with the outer peripheral surface of the ball nut, which is beneficial to aesthetics.

[0023] 3. In a preferred embodiment of this utility model, the width of the cover plate is greater than the width of the draft die along the width direction of the reverser, so that the cover plate has a stepped structure that protrudes outward by a preset distance along the width direction of the reverser body, and the stepped structure is connected to the stepped hole of the ball nut.

[0024] The width dimension of the cover plate protrudes beyond the width dimension of the draft die body in the width direction of the reverser. The purpose is to form a stepped structure between the draft die body and the cover plate. Correspondingly, a stepped surface is provided in the positioning hole of the ball nut. When the reverser is installed in the positioning hole, it is connected to the stepped surface through the stepped structure, so that the reverser is positioned and installed in the positioning hole, which plays a limiting role for the reverser and improves the assembly accuracy between the reverser and the positioning hole.

[0025] 4. In a preferred embodiment of the present invention, the reversing rotary groove extends in an S-shaped curve along the length of the reversing body and in a U-shaped curve along the height of the reversing body.

[0026] The reversing rotary groove is S-shaped along the length of the reversing body. The purpose is to make the reversing rotary groove conform to the second helical groove of the ball nut or the first helical groove on the lead screw. This allows the ball to smoothly transition from the rolling raceway formed by the first and second helical grooves into the reversing rotary groove, achieving a smooth connection between the entire rolling track, the first channel, the reversing rotary groove, and the second channel, and making the ball roll more smoothly in the entire circulation channel.

[0027] 5. In a preferred embodiment of the present invention, the inner side of the draft die facing the return rotary groove forms a smooth transition connection with the curved surface of the return rotary groove, the outer side of the draft die facing away from the return rotary groove has an arc-shaped transition surface for inserting a positioning hole for ball nut, and the top surface of the draft die facing away from the cover plate forms a spirally distributed curved surface.

[0028] The inner side of the draft mold, i.e. the side facing the return rotary groove, forms a smooth transition connection with the return rotary groove, so that the inner side of the draft mold and the inner wall of the return rotary groove form a tangent structure. This setting ensures that the rolling speed of the ball is not affected by the resistance of the ball as it rolls in the return rotary groove. The presence of the draft mold also further ensures that the ball's movement path always rolls smoothly forward along the extension direction of the return rotary groove, preventing the ball from deviating from its position. Attached Figure Description

[0029] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0030] Figure 1 This is a schematic diagram of the structure of an inverter at a first angle according to one embodiment of the present invention;

[0031] Figure 2This is a schematic diagram of the structure of an inverter from another angle according to one embodiment of the present invention;

[0032] In the picture,

[0033] 1. Reversing device body; 2. Reversing rotary groove; 3. Draft mold body; 4. Cover plate; 5. First guide part; 6. Second guide part; 7. Arc-shaped transition surface; 8. Step structure. Detailed Implementation

[0034] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0035] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0038] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0039] Example 1

[0040] This utility model relates to an inverter, such as Figure 1-2 As shown, a return channel for communicating with the inside of a ball nut to form a ball circulation rolling mechanism includes a reverser body 1. The reverser body 1 has a return rotary groove 2 for forming the return channel along its length. The reverser body 1 has a draft body 3 connected to both sides along its width. One side of the draft body 3 along its height can extend and protrude beyond the return rotary groove 2 at a preset height for insertion and connection to the ball nut. The two ends of the return rotary groove 2 extend towards the return channel by a preset distance, so that the two ends of the return rotary groove 2 respectively form a first guide part 5 and a second guide part 6 that can connect with the return channel to guide the ball into the return rotary groove 2.

[0041] The ball nut is connected to the outer circumference of the lead screw. The outer circumference of the lead screw has a first helical groove, which carries the ball, allowing the ball to roll within it. The inner circumference of the ball nut has a second helical groove corresponding to the first helical groove. The first and second helical grooves together form a rolling track to accommodate the rolling ball. The ball nut also has a first channel communicating with the inlet of the rolling track and a second channel communicating with the outlet of the rolling track. A positioning hole is also provided on the ball nut, forming a space for installing a reversing device. When in use, the reverser is inserted into the positioning hole. Since the reverser has a reversing groove 2, one end of the reversing groove 2 is connected to the first channel. The first channel connects the reversing groove 2 to the inlet of the rolling track. The other end of the reversing groove 2 is connected to the second channel. The second channel connects the reversing groove 2 to the outlet of the rolling track. Thus, the reversing groove 2, the first channel, the second channel and the rolling track are connected to form a circulating channel for the ball to roll, so that the ball nut can move relative to the axis of the screw.

[0042] In traditional ball nut and reversing mechanism connections, dimensional deviations can easily occur between the ball channels in the reversing mechanism and the ball nut due to dimensional tolerances or manufacturing errors. This leads to an uneven connection, causing the balls to collide with the reversing mechanism as they enter from the ball nut. This contact not only causes noise but also mutual wear between the reversing mechanism and the ball nut, which is detrimental to long-term use. Furthermore, the reversing mechanism is usually directly inserted into the positioning hole of the ball nut with an interference fit, making installation and disassembly inconvenient. After prolonged use, loosening may occur between the ball nut and the reversing mechanism, further exacerbated by the ball's wear. When passing through the reverser, it will push the reverser upward, making the connection between the reverser and the ball nut easier to loosen. Therefore, this application not only has a draft body 3 connected to both sides of the reverser body 1 along the width direction, but also has one side of the draft body 3 along the height direction that can extend and protrude beyond the preset height of the return rotary groove 2 to be inserted and connected to the ball nut, increasing the locking area between the reverser and the ball nut, increasing the friction between them, and preventing the reverser from coming off the positioning hole; moreover, the two ends of the return rotary groove 2 in this application extend towards the return channel by a preset distance, so that the two ends of the return rotary groove 2 in the length direction respectively form a first guide part 5 and a second guide part 6 that can be connected to the return channel to guide the ball into the return rotary groove 2.

[0043] The first guide portion can be bent inward at a certain angle along the extension direction of the return rotary groove 2, so that the first guide portion forms a first positioning surface that connects with the first channel. The edge of the first positioning surface is also provided with a first chamfer, so that the ball can smoothly enter the return rotary groove 2 through the first positioning surface. Similarly, the second guide portion 6 can be bent inward at a certain angle along the extension direction of the return rotary groove 2, so that the second guide portion 6 forms a second positioning surface that connects with the second channel. The edge of the second positioning surface is also provided with a second chamfer, so that the ball can smoothly exit and return to the rolling track through the second positioning surface. The first guide portion 5 and the second guide portion 6 can be tilted towards the return channel and partially connected with it, thereby further enhancing the smoothness and stability of the ball entering the return rotary groove 2 from the return channel, improving the running stability of the entire circulation channel, avoiding collision and wear between the reverser and the ball nut, improving the user experience and the service life of the reverser.

[0044] In a preferred embodiment, a cover plate 4 is connected to the other side of the draft body 3 along the height direction. Further, the draft body 3 and the cover plate 4 are integrally formed; or, the draft body 3 and the cover plate 4 are detachably connected.

[0045] like Figure 1As shown, by gripping the cover plate 4, the reverser is inserted into the positioning hole of the ball nut. After the reverser and the ball nut are engaged, the cover plate 4 covers the positioning hole and is located on the outside of the reverser. In practical applications, the draft mold body 3 and the cover plate 4 can be connected to form an integrated structure, thus enhancing the overall connection strength between the draft mold body 3 and the cover plate 4. Alternatively, the draft mold body 3 and the cover plate 4 can be detachably connected, so that when the cover plate 4 or the draft mold body 3 is worn, one of them can be replaced in time without affecting the use of the other component.

[0046] In a preferred embodiment, the bottom surface of the cover plate 4 is connected to the bottom surface of the reverser body 1, and can be coplanar with the outer peripheral surface of the ball nut after the reverser is inserted into the ball nut.

[0047] The bottom surface of the cover plate 4 can have a certain concave surface. The bottom surface of the cover plate 4 is concave to the outer peripheral surface of the inverter to prevent the cover plate 4 from protruding on the outer peripheral surface of the inverter body 1, which would be not conducive to assembly. Alternatively, the bottom surface of the cover plate 4 can be an arc surface. When the cover plate 4 is connected to the positioning hole of the ball nut and covers the positioning hole, it can form a coplanar structure with the outer peripheral surface of the ball nut, which is beneficial to aesthetics.

[0048] In a preferred embodiment, the width of the cover plate 4 is greater than the width of the draft die 3 along the width direction of the reverser, so that the cover plate 4 has a stepped structure 8 that protrudes outward by a predetermined distance along the width direction of the reverser body 1, and the stepped structure 8 is connected to the stepped hole of the ball nut through the engagement of the stepped structure 8.

[0049] In the width direction of the reverser, the width dimension of the cover plate 4 protrudes beyond the width dimension of the draft body 3. The purpose is to form a stepped structure 8 between the draft body 3 and the cover plate 4. Correspondingly, a stepped surface is provided in the positioning hole of the ball nut. When the reverser is installed in the positioning hole, it is connected to the stepped surface through the stepped structure 8, so that the reverser is positioned and installed in the positioning hole, which plays a limiting role for the reverser and improves the assembly accuracy between the reverser and the positioning hole.

[0050] In a preferred embodiment, the reversing rotary groove 2 extends in an S-shaped curve along the length of the inverter body 1, and in a U-shaped curve along the height of the inverter body 1.

[0051] like Figure 1As shown, the shape of the reversing rotary groove 2 along the length of the reverser body 1 is set in an S-shaped curve. The purpose is to make the reversing rotary groove 2 conform to the second helical groove of the ball nut or the first helical groove on the lead screw. This allows the ball to smoothly transition from the rolling raceway formed by the first and second helical grooves into the reversing rotary groove 2, realizing a smooth connection between the entire rolling track, the first channel, the reversing rotary groove 2, and the second channel, and making the ball roll more smoothly in the entire circulation channel.

[0052] In a preferred embodiment, the inner side of the draft body 3 facing the return rotary groove 2 forms a smooth transition connection with the curved surface of the return rotary groove 2, the outer side of the draft body 3 away from the return rotary groove 2 has an arc-shaped transition surface 7 for inserting a positioning hole for a ball nut, and the top surface of the draft body 3 away from the cover plate 4 forms a spirally distributed curved surface.

[0053] like Figure 1 As shown, the inner side of the draft body 3, i.e. the side facing the return rotary groove 2, forms a smooth transition connection with the return rotary groove 2, so that the inner side of the draft body 3 and the inner wall of the return rotary groove 2 form a tangent structure. This setting ensures that the rolling speed of the ball will not be reduced due to the resistance caused by the presence of the draft body 3 during the rolling process in the return rotary groove 2. The presence of the draft body 3 will also further ensure that the movement path of the ball always rolls smoothly forward along the extension direction of the return rotary groove 2, preventing the ball from deviating from its moving position.

[0054] The assembly structure between the draft body 3 and the ball nut is not specifically limited and can adopt any of the following implementation methods:

[0055] Implementation method 1: An elastic protrusion is provided on the arc transition surface 7 of the draft body 3. A groove is connected in the positioning hole of the ball nut corresponding to the position of the elastic protrusion, so that when the draft body 3 is inserted into the positioning hole, the compressed elastic protrusion can be engaged with the groove to achieve a tight connection between the reverser and the positioning hole.

[0056] The bottom surface of the elastic protrusion is connected to the arc-shaped transition surface 7 of the draft body 3. The elastic protrusion can be ellipsoidal, spherical, or block-shaped. The bottom surface of the elastic protrusion of the draft body 3 can be circular, elliptical, or square, with no specific limitation. The elastic protrusion is elastic, so that the draft body 3 will not cause obstruction when entering the positioning hole. When the draft body 3 enters the positioning hole, the elastic protrusions on both sides of the draft body 3 can be compressed inward by the hole wall of the positioning hole. When the elastic protrusion moves to the groove position of the positioning hole, the elastic protrusion will expand into the groove under the action of elastic force and engage with the groove, thereby realizing a tight connection between the reverser and the positioning hole, preventing the reverser from loosening with the positioning hole during long-term use. The reverser will not collide with the hole wall of the positioning hole under the rolling action of the ball, thereby avoiding the generation of abnormal noise, further improving the connection strength between the reverser and the ball nut, and improving the overall service life.

[0057] Implementation Method 2: An elastic protrusion is provided on the arc-shaped transition surface 7 of the draft die 3. A recessed groove is connected in the positioning hole of the ball nut corresponding to the position of the elastic protrusion, so that when the draft die 3 is inserted into the positioning hole, the compressed elastic protrusion can engage with the recessed groove, thereby achieving a tight connection between the reverser and the positioning hole.

[0058] One end of the elastic protrusion is connected to the arc-shaped transition surface 7 of the draft body 3, and the other end of the elastic protrusion faces the cover plate 4 and extends outward a certain distance from the arc-shaped transition surface 7 of the draft body 3, so that the elastic protrusion and the draft body 3 are inclined. When the draft body 3 is inserted into the positioning hole, the outwardly extending end of the elastic protrusion can be compressed by the hole wall of the positioning hole. The shape of the recessed groove is adapted to the shape of the elastic protrusion. When the elastic protrusion moves to the position of the recessed groove, the elastic boss is snapped into the recessed groove under the release of elastic force, thereby realizing the tight connection between the reverser and the positioning hole.

[0059] Example 2

[0060] This application also relates to a ball screw, which, according to the above-described reverser, includes a screw, a ball nut, balls, and a reverser.

[0061] The ball nut is connected to the outer periphery of the lead screw. The lead screw has a first helical groove for the rolling of multiple balls. The ball nut has a second helical groove corresponding to the first helical groove. The first helical groove and the second helical groove cooperate to form a rolling track for accommodating the rolling of the balls. The ball nut is provided with a positioning hole, and the reverser is connected to the ball nut through the positioning hole.

[0062] A second helical groove, a first channel, and a second channel are respectively provided on the ball nut. The second helical groove is distributed in a spiral shape inside the ball nut and is connected to the first helical groove of the lead screw. The first and second helical grooves form a spiral rolling track for the ball to roll. The first channel can communicate with the inlet at one end of the rolling track, and the second channel can communicate with the outlet at the other end of the rolling track. A reversing device is connected in the positioning hole on the ball nut. The reversing device has a reversing groove 2. One end of the reversing groove 2 is connected to the first channel, and the other end of the reversing groove 2 is connected to the second channel. Thus, the reversing groove 2 can communicate with the inlet of the rolling track through the first channel and with the outlet of the rolling track through the second channel, thereby realizing the circulation channel for the ball to roll formed by the rolling track, the first channel, the reversing groove 2, and the second channel.

[0063] Furthermore, the first guide portion of the reversing rotary groove 2 of the reverser can be connected to the first end of the rolling track, and the second guide portion 6 of the reversing rotary groove 2 can be connected to the second end of the rolling track, so that the reversing rotary groove 2 and the rolling track are connected to form a circulation channel for the reciprocating movement of the ball.

[0064] The first guide portion can be bent inward at a certain angle along the extension direction of the return rotary groove 2, so that the first guide portion forms a first positioning surface that connects with the first channel, thereby allowing the ball to smoothly enter the return rotary groove 2 through the first positioning surface. Similarly, the second guide portion 6 can be bent inward at a certain angle along the extension direction of the return rotary groove 2, so that the second guide portion 6 forms a second positioning surface that connects with the second channel, thereby allowing the ball to smoothly exit and return to the rolling track through the second positioning surface.

[0065] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0066] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0067] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A reversing device for communicating with the interior of a ball nut to form a return channel for the cyclic rolling of balls, characterized in that, It includes a reverser body, which has a reversing rotary groove along its length to form a return channel; the reverser body is connected to two sides along its width, and one side of the rotary groove along its height can extend and protrude beyond a preset height of the reversing rotary groove for insertion into a ball nut. The two ends of the return rotary groove extend towards the return channel by a predetermined distance, so that the two ends of the return rotary groove form a first guide part and a second guide part that can connect with the return channel to guide the balls into the return rotary groove.

2. The inverter according to claim 1, characterized in that, A cover plate is connected to the other side of the draft mold along the height direction.

3. The inverter according to claim 2, characterized in that, The draft mold body and the cover plate are integrated into one structure; or, the draft mold body and the cover plate are detachably connected.

4. An inverter according to claim 2, characterized in that, The bottom surface of the cover plate is connected to the bottom surface of the reversing device body, and can be coplanar with the outer circumferential surface of the ball nut after the ball nut is inserted into the reversing device.

5. An inverter according to claim 2, characterized in that, Along the width direction of the reverser, the width dimension of the cover plate is greater than the width dimension of the draft die, so that the cover plate has a stepped structure that protrudes outward by a preset distance along the width direction of the reverser body, and is connected to the stepped hole of the ball nut through the step structure.

6. An inverter according to claim 1, characterized in that, The reversing rotary groove extends in an S-shaped curve along the length of the reversing body, and in a U-shaped curve along the height of the reversing body.

7. An inverter according to claim 2, characterized in that, The inner side of the draft die facing the return rotary groove forms a smooth transition connection with the curved surface of the return rotary groove. The outer side of the draft die facing away from the return rotary groove has an arc-shaped transition surface for the positioning hole for inserting the ball nut. The top surface of the draft die facing away from the cover plate forms a spirally distributed curved surface.

8. An inverter according to claim 7, characterized in that, The arc-shaped transition surface of the draft die is provided with elastic protrusions. The positioning hole of the ball nut is connected to the corresponding position of the elastic protrusions, so that when the draft die is inserted into the positioning hole, the compressed elastic protrusions can engage with the grooves, thereby achieving a tight connection between the reverser and the positioning hole.

9. A ball screw, comprising a reversing device according to any one of claims 1-8, characterized in that, Includes lead screw, ball nut, balls, and reverser; The ball nut is connected to the outer periphery of the lead screw. The lead screw has a first helical groove for the rolling of multiple balls. The ball nut has a second helical groove corresponding to the first helical groove. The first helical groove and the second helical groove cooperate to form a rolling track for accommodating the rolling of the balls. The ball nut has a positioning hole, and the reverser is connected to the ball nut through the positioning hole.

10. A ball screw according to claim 9, characterized in that, The first guide part of the reversing rotary groove of the reverser can be connected to the first end of the rolling track, and the second guide part of the reversing rotary groove can be connected to the second end of the rolling track, so that the reversing rotary groove and the rolling track are connected to form a circulation channel for the reciprocating movement of the balls.

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