Lead screw nut insert module and driver

Abstract

The invention provides a lead screw nut insert module which comprises a nut sleeve and a magnetic steel sleeve, at least one of the nut sleeve and the magnetic steel sleeve comprises a limiting part, at least part of the limiting part is connected with magnetic steel in a limiting mode, and the limiting part can limit the magnetic steel so as to improve the installation precision of the magnetic steel. The driver comprises a lead screw nut assembly and a rotor set, the lead screw nut assembly comprises a nut sleeve, the rotor set comprises magnetic steel and a magnetic steel sleeve, at least one of the nut sleeve and the magnetic steel sleeve comprises a limiting part, at least part of the limiting part is connected with the magnetic steel in a limiting mode, and the limiting part can limit the magnetic steel so as to improve the installation precision of the magnetic steel.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of drivers, and particularly relates to a screw nut insert module and a driver. BACKGROUND

[0002] The screw nut assembly can be applied to a driver, in particular a linear driver. The screw nut assembly is one of important components of the linear driver. The linear driver comprises a screw nut assembly and a rotor set. The screw nut assembly comprises a nut sleeve. The nut sleeve is connected and fixed with the rotor set. The rotor set can drive the nut sleeve to rotate synchronously. The rotor set comprises a magnetic steel and a magnetic steel sleeve for fixing the magnetic steel. The magnetic steel and the magnetic steel sleeve are generally connected by a pasting fixing mode. The installation position of the magnetic steel relative to the magnetic steel sleeve (the installation precision of the magnetic steel) will affect the performance of the driver. However, the installation position of the magnetic steel relative to the magnetic steel sleeve is difficult to control during the assembly of the magnetic steel and the magnetic steel sleeve, that is, the installation precision of the magnetic steel is low. SUMMARY

[0003] The application aims to improve the installation precision of the magnetic steel.

[0004] The application provides a screw nut insert module, which comprises a nut sleeve, a magnetic steel sleeve and a magnetic steel. The nut sleeve is at least partially connected with the magnetic steel sleeve in assembly or is an integral part. The magnetic steel is at least partially connected with the magnetic steel sleeve in assembly.

[0005] At least one of the nut sleeve and the magnetic steel sleeve comprises a limiting part. At least part of the limiting part extends in a direction parallel to the axis of the nut sleeve. At least part of the limiting part is connected with the magnetic steel in limiting mode.

[0006] The screw nut insert module provided by the application comprises a nut sleeve and a magnetic steel sleeve. At least one of the nut sleeve and the magnetic steel sleeve comprises a limiting part. At least part of the limiting part is connected with the magnetic steel in limiting mode. The limiting part can limit the magnetic steel to improve the installation precision of the magnetic steel.

[0007] The application further provides a driver, which comprises a screw nut assembly and a rotor set. The rotor set and the screw nut assembly are drivingly connected. The screw nut assembly comprises a nut sleeve. The rotor set comprises a magnetic steel and a magnetic steel sleeve for fixing the magnetic steel. At least one of the nut sleeve and the magnetic steel sleeve comprises a limiting part connected with the magnetic steel in limiting mode. At least part of the limiting part extends in a direction parallel to the axis of the nut sleeve.

[0008] The driver provided in the application comprises a screw nut assembly and a rotor set, the screw nut assembly comprises a nut sleeve, the rotor set comprises a magnetic steel and a magnetic steel sleeve, at least one of the nut sleeve and the magnetic steel sleeve comprises a limiting part, at least part of the limiting part is in limiting connection with the magnetic steel, and the limiting part can realize limiting of the magnetic steel, so that the installation precision of the magnetic steel is improved. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative labor.

[0010] Figure 1 A perspective view of a screw nut insert injection molding module provided by an embodiment of the application;

[0011] Figure 2 A front view of a screw nut insert injection molding module provided by an embodiment of the application;

[0012] Figure 3 A sectional view of a screw nut insert injection molding module provided by an embodiment of the application;

[0013] Figure 4 Another sectional view of a screw nut insert injection molding module provided by an embodiment of the application;

[0014] Figure 5 An exploded view of a screw nut insert injection molding module provided by an embodiment of the application;

[0015] Figure 6 A sectional view of a driver provided by an embodiment of the application.

[0016] In the drawings: 1-nut sleeve; 11-internal thread; 2-magnetic steel sleeve; 21-first groove; 22-second groove; 23-external thread; 24- boss; 2a-magnetic steel sleeve inner wall; 2b-magnetic steel sleeve outer wall; 3-limiting part; 31-first part; 310-first wall; 32-second part; 320-second wall; 3a-first limiting group; 3b-second limiting group; 4-magnetic steel; 410-first magnetic steel wall; 420-second magnetic steel wall; 430-third magnetic steel wall; 440-fourth magnetic steel wall; 4a-first end wall; 4b-second end wall; 41-magnetic steel inner wall; 42-magnetic steel outer wall; 5-magnetic conducting part; A-screw nut assembly; B-rotor set; 6-screw rod. DETAILED DESCRIPTION

[0017] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The description of the exemplary embodiments is intended to apply to any embodiment of the application, unless specifically stated otherwise. It is to be understood that other embodiments can be utilized, and structural or procedural changes can be made without departing from the scope of the present application. Therefore, the following detailed description is not intended to be limiting.

[0018] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0019] It should be understood that the use of "first", "second", and / or "third" words of description herein, if any, are used for convenience and do not connote or imply any importance, priority, preeminence, or order of importance. Similarly, the use of "one" or "a" or "the" are intended to be interpreted to mean at least one; "plurality" means two or more. As used herein, the terms "front", "back", "up", "down", "top", "bottom", and the like, if any, are used for convenience and are not intended to connote or imply any particular position or spatial orientation. The terms "comprises", "comprising", "includes", "including", and the like, if any, are intended to be inclusive and mean that any listed step can be present, but not exclusive, other steps being also allowed.

[0020] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The description of the exemplary embodiments is intended to apply to any embodiment of the application, unless specifically stated otherwise. It is to be understood that other embodiments can be utilized, and structural or procedural changes can be made without departing from the scope of the present application. Therefore, the following detailed description is not intended to be limiting.

[0021] A lead screw nut insert module of the present application comprises a nut sleeve 1, a magnet sleeve 2 and a magnet 4, the nut sleeve 1 is connected to the magnet sleeve 2 at least partially, and the magnet 4 is connected to the magnet sleeve 2 at least partially.

[0022] At least one of the nut sleeve 1 and the magnet sleeve 2 comprises a limiting portion 3, at least part of the limiting portion 3 extends in a direction parallel to the axis L of the nut sleeve 1, and at least part of the limiting portion 3 cooperates with the magnet 4, or at least part of the limiting portion 3 is connected to the magnet 4 in limiting manner.

[0023] The screw nut insert module provided in the application comprises a nut sleeve 1 and a magnetic steel sleeve 2, at least one of the nut sleeve 1 and the magnetic steel sleeve 2 comprises a limiting portion 3 matched with a magnetic steel 4, in other words, the limiting portion 3 is in limiting connection with the magnetic steel 4, the limiting portion 3 can limit the magnetic steel 4, through the structural improvement of the nut sleeve 1 and / or the magnetic steel sleeve 2, the limiting portion 3 can realize the positioning / limiting of the magnetic steel 4, so as to improve the installation precision of the magnetic steel 4.

[0024] According to one specific embodiment of the application, please refer to Figures 1 to 5 , the screw nut insert module comprises the nut sleeve 1 and a rotor group B, the nut sleeve 1 and the rotor group B are connected and fixed, under the action of the rotor group B, the nut sleeve 1 can rotate synchronously with the rotor group B.

[0025] The screw nut insert module comprises a screw nut assembly A, the screw nut assembly A comprises the nut sleeve 1, the nut sleeve 1 belongs to the part of the screw nut assembly A.

[0026] The screw nut insert module of the embodiment comprises the magnetic steel sleeve 2 and the magnetic steel 4, at least part of the nut sleeve 1 is connected with the magnetic steel sleeve 2, at least part of the magnetic steel 4 is connected with the magnetic steel sleeve 2, and at least part of the magnetic steel sleeve 2 is located between the nut sleeve 1 and the magnetic steel 4.

[0027] Preferably, at least part of the nut sleeve 1 is assembled and connected with the magnetic steel sleeve 2, and at least part of the magnetic steel 4 is assembled and connected with the magnetic steel sleeve 2.

[0028] Further, the magnetic steel sleeve 2 is provided in a tubular structure, please refer to Figure 1 and Figure 5 , the magnetic steel sleeve 2 comprises a magnetic steel sleeve outer wall 2b and a magnetic steel sleeve inner wall 2a, the magnetic steel 4 is located at the magnetic steel sleeve outer wall 2b, and the screw nut 1 is located at the magnetic steel sleeve inner wall 2a, as shown in Figure 3 .

[0029] Further, at least one of the nut sleeve 1 and the magnetic steel sleeve 2 comprises a limiting portion 3, at least part of the limiting portion 3 is in limiting connection with the magnetic steel 4, in other words, at least part of the limiting portion 3 is matched with the magnetic steel 4, and at least part of the limiting portion 3 has a limiting / positioning effect on the magnetic steel 4.

[0030] Preferably, at least part of the limiting portion 3 extends in a direction parallel to the axis L of the nut sleeve 1, further, at least part of the limiting portion 3 extends along the radial direction of the nut sleeve 1.

[0031] It should be noted that the above-mentioned limiting portion 3 and the magnetic steel 4 limiting connection includes that the limiting portion 3 and the magnetic steel 4 have a similar connection relationship of cooperation and fixation, and at the same time, the limiting portion 3 and the magnetic steel 4 limiting connection also includes that the limiting portion 3 and the magnetic steel 4 have no cooperation and fixation between them, for example, part of the limiting portion 3 only contacts the magnetic steel 4, and the limiting portion 3 and the magnetic steel 4 are not connected and fixed by the connecting structure. That is, the limiting portion 3 has a limiting / positioning effect on the magnetic steel 4, but it does not limit whether the limiting portion 3 and the magnetic steel 4 are connected and fixed, that is, the limiting portion 3 has a limiting / positioning effect on the magnetic steel 4, and the limiting portion 3 and the magnetic steel 4 can be connected and fixed by the connecting structure or there is no connecting structure between the limiting portion 3 and the magnetic steel 4, for example, the limiting portion 3 and the magnetic steel 4 only partially contact.

[0032] At least part of the limiting portion 3 and the magnetic steel 4 are limitingly connected, and the installation position of the magnetic steel 4 in the magnetic steel sleeve 2 can be determined by the limiting portion 3, and the limiting portion 3 can improve the installation accuracy of the magnetic steel 4 in the magnetic steel sleeve 2.

[0033] Most of the related technologies use magnetic steel pasting tooling to assist the installation of the magnetic steel 4 in the magnetic steel sleeve 2. For the technical solution to improve the installation accuracy of the magnetic steel 4 and the magnetic steel sleeve 2, most of the related technologies improve the magnetic steel pasting tooling to improve the installation accuracy of the magnetic steel 4 relative to the magnetic steel sleeve 2, but due to the complex structure of the magnetic steel pasting tooling, many factors need to be considered when improving the magnetic steel tooling, which will complicate the improvement of the magnetic steel pasting tooling related to improving the installation accuracy of the magnetic steel 4.

[0034] After a large amount of research and analysis, the applicant found that the improvement of the screw nut assembly A and / or the rotor group B is simpler than the improvement of the magnetic steel pasting tooling, and the structural improvement of the screw nut assembly A and / or the rotor group B can also improve the installation accuracy of the magnetic steel 4 relative to the magnetic steel sleeve 2.

[0035] Based on the above findings, the application designs at least one of the nut sleeve 1 and the magnetic steel sleeve 2 to include a limiting portion 3, at least part of the limiting portion 3 is limitingly connected with the magnetic steel 4, so that the limiting portion 3 can limit the magnetic steel 4, thereby improving the installation accuracy of the magnetic steel 4. In addition, the structure of the screw nut assembly A and / or the rotor group B is less complex than that of the magnetic steel pasting tooling, and when improving the screw nut assembly A and / or the rotor group B, the factors that need to be considered are reduced. The limiting effect of the limiting portion 3 on the magnetic steel 4 can improve the installation accuracy of the magnetic steel 4, thereby making the improvement of the installation accuracy of the magnetic steel 4 simpler.

[0036] This embodiment takes the nut sleeve 1 including the limiting portion 3 as an example for description, as shown in Figure 3 and Figure 5 At least part of the limiting portion 3 contacts the magnetic steel 4 to position / limit the magnetic steel 4.

[0037] In this embodiment, the limiting part 3 includes a first part 31, and the first part 31 and the magnet 4 are arranged along the axis L of the nut sleeve 1. The first part 31 is at least partially in contact with the magnet 4, and the first part 31 has an axial limiting effect on the magnet 4 along the axis L of the nut sleeve 1. That is, the first part 31 can restrict the magnet 4 from moving along the axis L of the nut sleeve 1.

[0038] Specifically, the magnet 4 includes a first magnet wall 410 and a second magnet wall 420. The first magnet wall 410 and the second magnet wall 420 are arranged along the axis L of the nut sleeve 1. The first part 31 includes a first wall 310. The first magnet wall 410 or the second magnet wall 420 is at least partially in contact with the first wall 310.

[0039] This embodiment is described using the example of the first magnetic steel wall 410 being in at least partial contact with the first wall 310. Figure 3 As shown.

[0040] Optional, such as Figure 3 As shown, the first magnet wall 410 is perpendicular to the axis L of the nut sleeve 1, the second magnet wall 420 is perpendicular to the axis L of the nut sleeve 1, and the first magnet wall 410 and the second magnet wall 420 are parallel to each other.

[0041] In this embodiment, the magnet sleeve 2 and the magnet 4 can be regarded as part of rotor assembly B.

[0042] like Figure 3 and Figure 5 As shown, the magnetic sleeve 2 has a first groove 21, which penetrates the walls on both sides of the magnetic sleeve 2 along the wall thickness direction. At least part of the first part 31 is located in the first groove 21 and is connected to the magnetic sleeve 2. The magnetic sleeve 2 and the nut sleeve 1 are connected and fixed through the first part 31. In other words, the first part 31 connects the magnetic sleeve 2 and the nut sleeve 1 to improve the stability of the connection between the magnetic sleeve 2 and the nut sleeve 1 and improve the shear resistance of the nut sleeve 1 and the magnetic sleeve 2 during transmission.

[0043] Preferably, the limiting part 3 is designed as a first protrusion, which extends from the nut sleeve 1 toward the magnet sleeve 2 and protrudes from the outer wall 2b of the magnet sleeve 2. The limiting part 3 / first protrusion has a simple structure and is convenient and quick to process and manufacture.

[0044] The shape of the limiting part 3 / first protrusion is not limited to, for example Figure 1 , Figure 2 and Figure 5 The square structure shown can also be designed as a cylinder or other irregular shape.

[0045] In this embodiment, the limiting part 3 includes a second part 32, which and the magnet 4 are arranged circumferentially along the nut sleeve 1. The second part 32 is at least partially in contact with the magnet 4, and the second part 32 has a limiting effect on the magnet 4 in the circumferential direction of the nut sleeve 1. That is, the first part 31 can restrict the movement of the magnet 4 in the circumferential direction of the nut sleeve 1. It should be noted that the circumferential direction of the nut sleeve 1 means the circumferential direction of the nut sleeve 1 with the axis L of the nut sleeve 1 as the center line of rotation.

[0046] Specifically, such as Figure 2 As shown, the magnet 4 includes a third magnet wall 430 and a fourth magnet wall 440, which are arranged circumferentially along the nut sleeve 1. The second part 32 includes a second wall 320, and at least one of the third magnet wall 430 and the fourth magnet wall 440 is in at least partial contact with the second wall 320.

[0047] This embodiment is described with the example of the third magnet wall 430 being in at least partial contact with the second wall 320, the third magnet wall 430 being able to restrict the movement of the second part 32 along the circumference of the nut sleeve 1, and the fourth magnet wall 440 being in at least partial contact with the second wall 320, the fourth magnet wall 440 being able to restrict the movement of the second part 32 along the circumference of the nut sleeve 1.

[0048] like Figure 5 As shown, the magnet sleeve 2 has a second groove 22, which is located between adjacent magnets 4. The second groove 22 penetrates the walls on both sides of the magnet sleeve 2 along the wall thickness direction. The second part 32 is at least partially located in the second groove 22 and at least partially connected to the magnet sleeve 2. The magnet sleeve 2 and the nut sleeve 1 are connected and fixed through the second part 32. In other words, the second part 32 connects the magnet sleeve 2 and the nut sleeve 1 to improve the stability of the connection between the magnet sleeve 2 and the nut sleeve 1 and improve the shear resistance of the nut sleeve 1 and the magnet sleeve 2 during transmission.

[0049] The first part 31, combined with the second part 32, significantly improves the stability of the connection between the magnet sleeve 2 and the nut sleeve 1. Therefore, the shear resistance of the nut sleeve 1 and the magnet sleeve 2 is stronger during the transmission process.

[0050] Preferably, the limiting part 3 is designed as a second protrusion, which extends from the nut sleeve 1 toward the magnet sleeve 2 and protrudes from the outer wall 2b of the magnet sleeve 2. The limiting part 3 / second protrusion has a simple structure and is convenient and quick to process and manufacture.

[0051] The shape of the limiting part 3 / second protrusion is not limited to, for example Figure 1 , Figure 2 and Figure 5 The square structure shown can also be designed as a cylinder or other irregular shape.

[0052] The structural shapes of Part 1 (31) and Part 2 (32) may be the same or different.

[0053] In this embodiment, as Figure 1 , Figure 2 and Figure 5 As shown, the limiting part 3 includes a first limiting group 3a and a second limiting group 3b. The first limiting group 3a and the second limiting group 3b are arranged along the axial direction of the nut sleeve 1. The first limiting group 3a includes at least one first part 31, and the second limiting group 3b includes at least one second part 32. The first part 31 and the second part 32 are spaced apart along the circumference of the nut sleeve 1. The first limiting group 3a and the second limiting group 3b can further improve the connection stability between the nut sleeve 1 and the magnet sleeve 2. At the same time, they can limit the movement of the magnet 4 along the circumference of the nut sleeve 1 and along the axial direction L of the nut sleeve 1.

[0054] The magnet 4 includes a first end wall 4a, defined as extending circumferentially along the nut sleeve 1, and a second end wall 4b, defined as extending axially along the nut sleeve 1. A first part 31 at least partially mates with the first end wall 4a, and a second part 32 at least partially mates with the second end wall 4b. In other words, the first end wall 4a includes a first magnet wall 410 and a second magnet wall 420, and the second end wall 4b includes a third magnet wall 430 and a fourth magnet wall 440.

[0055] In addition, in this embodiment, the magnet sleeve 2 includes an external thread 23, which is located at the end of the magnet sleeve 2. The magnet sleeve 2 can be connected and fixed to other components of the linear actuator through the external thread 23.

[0056] In this embodiment, the magnet sleeve 2 includes a boss 24, which is located on the side of the limiting part 3 away from the magnet 4 and on the side of the magnet 4 close to the external thread 23. The boss 24 can position the installation position of other components of the screw nut insert structure and the magnet sleeve 2.

[0057] The lead screw nut insert module includes a magnetic conductive part 5, which is also considered part of the rotor assembly B. At least part of the magnetic conductive part 5 connects the magnet 4 and the magnet sleeve 2. The magnetic conductive part 5 has a magnetic guiding function between the magnet 4 and the magnet sleeve 2, and can conduct the magnetic field of the magnet 4 to the magnet sleeve 2.

[0058] At least a portion of the magnetically conductive part 5 is located between the nut sleeve 1 and the magnet 4, and is projected along the radial direction of the magnet sleeve 2 and pointing towards the axis L of the magnet sleeve 2. The projection area of ​​the magnetically conductive part 5 at least covers the projection area of ​​the magnet 4. That is, the entire projection area of ​​the magnet 4 is located within the projection area of ​​the magnetically conductive part 5. In other words, the projection area of ​​the magnetically conductive part 5 located on the projection plane is not smaller than the projection area of ​​the magnet 4 located on the same projection plane.

[0059] In this embodiment, the magnetic field of the magnet 4 can be transmitted to the magnet sleeve 2 through the magnetic guide part 5. By designing the projection area of ​​the magnetic guide part 5 to at least cover the projection area of ​​the magnet 4, the connection surface between the magnetic guide part 5 and the magnet 4 is increased. Since the area of ​​the magnet 4 is limited, when the connection surface between the magnetic guide part 5 and the magnet 4 is increased, the connection surface between the nut sleeve 1 and the magnet 4 can be reduced accordingly, thereby reducing the influence of the nut sleeve 1 on the magnetic field of the rotor assembly / magnet 4, and thus reducing the negative impact of the nut sleeve 1 on the linear actuator.

[0060] Furthermore, the magnetic conductive part 5 and the magnetic sleeve 2 are integrated into one piece.

[0061] Preferably, in this embodiment, the magnet 4 is bonded and fixed to the magnet sleeve 2 and the magnetic conductive part 5.

[0062] The materials of the lead screw nut 1 and the magnet sleeve 2 can be the same or different. This embodiment uses two different materials for the lead screw nut 1 and the magnet sleeve 2 as an example for further description.

[0063] The nut sleeve 1 is a plastic part. In this embodiment, the magnet sleeve 2 is preferably, but not limited to, a steel structure. The magnet sleeve 2 is connected and fixed to the plastic lead screw nut 1, which can reduce the weight of the lead screw nut insert structure and achieve lightweighting of the lead screw nut insert structure.

[0064] Optionally, the lead screw nut 1 made of plastic is made of high-strength plastic.

[0065] At least one of the first groove 21 and the second groove 22 can be used as an injection hole, through which the lead screw nut 1 can be formed by injection molding into the inner wall 22 of the magnet sleeve 2.

[0066] The nut sleeve 1 includes an internal thread 11, which is an injection-molded structure.

[0067] The internal thread 11 can be integrally injection molded with the lead screw and nut 1. In other words, when the lead screw and nut 1 is injection molded, the internal thread 11 is also formed, which simplifies the processing technology of the lead screw and nut 1. It should be noted that after the internal thread 11 is injection molded together with the lead screw and nut 1, if other processing methods such as grinding or machining the internal thread are used, it should also be considered as the case where the internal thread 11 is injection molded together with the lead screw and nut 1, and it should also fall within the protection scope of this application.

[0068] Furthermore, the magnet sleeve 2 is configured as a tubular structure, the nut sleeve 1 is configured as a tubular structure, and the axis of the nut sleeve 1 coincides with the axis of the magnet sleeve 2.

[0069] This application also provides a drive, which includes a lead screw and nut assembly A and a rotor assembly B, the rotor assembly B and the lead screw and nut assembly A being drively connected. The lead screw and nut assembly A includes a nut sleeve 1, the rotor assembly B includes a magnet 4 and a magnet sleeve 2 for fixing the magnet 4, at least one of the nut sleeve 1 and the magnet sleeve 2 includes a limiting portion 3 that cooperates with the magnet 4, at least a portion of the limiting portion 3 extending in a direction parallel to the axis L of the nut sleeve 1.

[0070] The actuator of this application includes a lead screw and nut assembly A and a rotor assembly B. The lead screw and nut assembly A includes a nut sleeve 1, and the rotor assembly B includes a magnet 4 and a magnet sleeve 2. At least one of the nut sleeve 1 and the magnet sleeve 2 includes a limiting part 3, and at least part of the limiting part 3 is limitedly connected to the magnet 4. The limiting part 3 is capable of limiting the magnet 4.

[0071] According to a specific embodiment of this application, please refer to Figure 6 As shown, the driver includes a lead screw and nut assembly A and a rotor assembly B. The rotor assembly B and the lead screw and nut assembly A are connected by a transmission, and the rotor assembly B can drive the lead screw and nut assembly A to move under the action of the rotor assembly B.

[0072] The driver in this embodiment is preferably, but not limited to, a linear driver.

[0073] The lead screw and nut insert module includes a lead screw and nut assembly A, which includes a nut sleeve 1, and the nut sleeve 1 is a part of the lead screw and nut assembly A.

[0074] like Figure 6 As shown, the lead screw and nut assembly A includes a lead screw 6, which is threadedly connected to a nut sleeve 1. The nut sleeve 1 transmits rotational driving force to the lead screw 6, while the lead screw 6 undergoes linear motion along the axis of the lead screw 6 due to the action of the connecting parts.

[0075] The rotor assembly B includes a magnet 4 and a magnet sleeve 2 for fixing the magnet 4. At least a portion of the nut sleeve 1 is connected to the magnet sleeve 2, at least a portion of the magnet 4 is connected to the magnet sleeve 2, and at least a portion of the magnet sleeve 2 is located between the nut sleeve 1 and the magnet 4.

[0076] Preferably, at least a portion of the nut sleeve 1 is assembled and connected to the magnet sleeve 2, and at least a portion of the magnet 4 is assembled and connected to the magnet sleeve 2.

[0077] At least one of the nut sleeve 1 and the magnet sleeve 2 includes a limiting portion 3 that cooperates with the magnet 4. In other words, at least one of the nut sleeve 1 and the magnet sleeve 2 includes a limiting portion 3. The limiting portion 3 is limitedly connected to the magnet 4. At least a portion of the limiting portion 3 extends in a direction parallel to the axis L of the nut sleeve 1. Furthermore, in this embodiment, at least a portion of the limiting portion 3 extends radially along the nut sleeve 1.

[0078] It should be noted that the aforementioned limiting connection between the limiting part 3 and the magnet 4 includes both a connection that achieves a fixed fit between the limiting part 3 and the magnet 4, and a connection where the limiting part 3 and the magnet 4 are not fixed together. For example, the limiting part 3 may only partially contact the magnet 4, and the limiting part 3 and the magnet 4 may not be fixed together through a connecting structure. In other words, while the limiting part 3 provides a limiting / positioning effect on the magnet 4, it does not restrict whether the limiting part 3 and the magnet 4 are fixed together. That is, while the limiting part 3 provides a limiting / positioning effect on the magnet 4, the limiting part 3 and the magnet 4 can be fixed together through a connecting structure, or there may be no connecting structure between the limiting part 3 and the magnet 4, for example, the limiting part 3 and the magnet 4 may only partially contact each other.

[0079] At least a portion of the limiting part 3 is connected to the magnet 4 for limiting. The limiting part 3 can determine the installation position of the magnet 4 in the magnet sleeve 2, and can improve the installation accuracy of the magnet 4 in the magnet sleeve 2. Most related technologies utilize magnet bonding fixtures to assist in the installation of the magnet 4 in the magnet sleeve 2. For technical solutions to improve the installation accuracy of the magnet 4 and the magnet sleeve 2, most related technologies improve the installation accuracy of the magnet 4 relative to the magnet sleeve 2 by modifying the magnet bonding fixture.

[0080] However, due to the complex structure of the magnet bonding fixture in the relevant technology, there are many factors to consider when improving the magnet bonding fixture, which in turn complicates the structural improvements involved in improving the installation accuracy of the magnet 4.

[0081] After extensive research and analysis, the applicant found that improving the lead screw and nut assembly A and / or rotor assembly B is simpler than improving the magnet bonding fixture. Furthermore, structural improvements to the lead screw and nut assembly A and / or rotor assembly B can also improve the installation accuracy of the magnet 4 relative to the magnet sleeve 2.

[0082] This application designs at least one of the nut sleeve 1 and the magnet sleeve 2 to include a limiting part 3, and at least part of the limiting part 3 is connected to the magnet 4 for limiting, so that the limiting part 3 can limit the magnet 4, thereby improving the installation accuracy of the magnet 4. In addition, the structure of the lead screw nut assembly A and / or rotor assembly B is less complex than that of the magnet bonding fixture, so the factors that need to be considered when improving the lead screw nut assembly A and / or rotor assembly B are reduced. The installation accuracy of the magnet 4 can be improved by using the limiting part 3 to limit the magnet 4, thus making the improvement of the installation accuracy of the magnet 4 simpler.

[0083] In the driver of this embodiment, the nut sleeve 1 includes a limiting part 3, at least a portion of the limiting part 3 cooperates with the magnet 4 to limit the magnet 4, and at least a portion of the limiting part 3 is connected to the magnet sleeve 2. The limiting part 3 connects the nut sleeve 1 to the magnet sleeve 2.

[0084] Furthermore, at least part of the limiting part 3 makes contact with the magnet 4 to limit the magnet 4.

[0085] In the driver of this embodiment, the magnet sleeve 2 includes an inner wall 2a and an outer wall 2b of the magnet sleeve 2 arranged along the wall thickness direction of the magnet sleeve 2. The nut sleeve 1 is located on the inner wall 2a of the magnet sleeve, and the magnet 4 is located on the outer wall 2b of the magnet sleeve. The magnet 4 includes an inner wall 41 and an outer wall 42 of the magnet sleeve 2 arranged along the wall thickness direction of the magnet sleeve 2. The outer wall 42 of the magnet is further away from the magnet sleeve 2 than the inner wall 41 of the magnet.

[0086] In this embodiment, the nut sleeve 1 is configured as a tubular structure, and the magnet sleeve 2 is designed as a tubular structure.

[0087] The maximum distance between the axis L of the nut sleeve 1 and the limiting part 3 is defined as S1, and the maximum distance between the axis L of the nut sleeve 1 and the outer wall 2b of the magnet sleeve is defined as S2. Then S1≤S2, thereby reducing the impact of the limiting part 3 on other mounting structures inside the driver and the performance of the driver.

[0088] The nut sleeve 1 is an injection molded part. The lead screw nut assembly A includes an internal thread 11, which is located on the inner wall of the nut sleeve 1. The internal thread 11 and the nut sleeve 1 are integrally injection molded. In other words, when the lead screw nut 1 is injection molded, the internal thread 11 is also formed, which simplifies the processing technology of the lead screw nut 1. It should be noted that after the internal thread 11 is injection molded together with the lead screw nut 1, if other processing methods such as grinding or machining the internal thread are used, it should also be considered as a scheme in which the internal thread 11 is injection molded together with the lead screw nut 1, and it should also fall within the protection scope of this application.

[0089] Some of the technical implementation methods described above can be combined or replaced.

[0090] The technical principles of this application have been described above in conjunction with specific embodiments. However, it should be noted that these descriptions are merely for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, other specific embodiments or equivalent substitutions of this application that can be conceived by those skilled in the art without creative effort will fall within the scope of protection of this application.

Claims

1. A lead screw nut insert module, characterized in that: It includes a nut sleeve, a magnet sleeve, and a magnet, wherein the nut sleeve is at least partially fitted and connected to the magnet sleeve or is an integral piece, and the magnet is at least partially fitted and connected to the magnet sleeve; At least one of the nut sleeve and the magnet sleeve includes a limiting portion, at least a portion of which extends in a direction parallel to the axis of the nut sleeve, and at least a portion of which is limited and connected to the magnet.

2. The lead screw and nut insert module according to claim 1, characterized in that: The nut sleeve includes a limiting portion, at least a portion of which is in contact with the magnet.

3. The lead screw nut insert module according to claim 1 or 2, characterized in that: The limiting part includes a first part, and the first part and the magnet are arranged along the axial direction of the nut sleeve; The magnet includes a first magnet wall and a second magnet wall, which are arranged along the axial direction of the nut sleeve. The first part includes a first wall, and the first magnet wall or the second magnet wall is in at least partial contact with the first wall.

4. The lead screw and nut insert module according to claim 3, characterized in that: The magnet sleeve has a first groove that extends through the walls on both sides of the magnet sleeve along the wall thickness direction. At least a first part is located in the first groove and at least a portion of the first part is connected to the magnet sleeve.

5. The lead screw and nut insert module according to claim 1 or 2, characterized in that: The limiting part includes a second part, and the second part and the magnet are arranged along the circumference of the nut sleeve; The magnet includes a third magnet wall and a fourth magnet wall, which are arranged circumferentially along the nut sleeve. The second part includes a second wall, and at least one of the third magnet wall and the fourth magnet wall is in at least partial contact with the second wall.

6. The lead screw and nut insert module according to claim 5, characterized in that: The magnet sleeve has a second groove located between adjacent magnets. The second groove penetrates the walls on both sides of the magnet sleeve along the wall thickness direction. At least a second part is located in the second groove, and at least a portion of the second part is connected to the magnet sleeve.

7. The lead screw nut insert module according to claim 1 or 2, characterized in that: The limiting part includes a first limiting group and a second limiting group. The first limiting group and the second limiting group are arranged along the axial direction of the nut sleeve. The first limiting group includes at least one first part, and the second limiting group includes at least one second part. The first part and the second part are arranged at intervals along the circumferential direction of the nut sleeve. The magnet includes a first end wall, which is defined to extend circumferentially along the nut sleeve, and a second end wall, which is defined to extend axially along the nut sleeve. The first part at least partially mates with the first end wall, and the second part at least partially mates with the second end wall.

8. The lead screw nut insert module according to claim 1 or 2, characterized in that: The magnet sleeve includes a boss, which is located on the side of the limiting portion away from the magnet. The nut sleeve is a plastic part, and the nut sleeve includes an internal thread, which is an injection-molded structure.

9. A driver, characterized in that: The device includes a lead screw and nut assembly and a rotor assembly, the rotor assembly and the lead screw and nut assembly being drivenly connected. The lead screw and nut assembly includes a nut sleeve. The rotor assembly includes a magnet and a magnet sleeve for fixing the magnet. At least one of the nut sleeve and the magnet sleeve includes a limiting portion that is limited and connected to the magnet. At least a portion of the limiting portion extends in a direction parallel to the axis of the nut sleeve.

10. The driver according to claim 9, characterized in that: The nut sleeve includes a limiting portion, at least a portion of which engages with the magnet, and at least a portion of which is connected to the magnet sleeve.

11. The driver according to claim 9 or 10, characterized in that: The magnetic sleeve includes an inner wall and an outer wall of the magnetic sleeve arranged along the wall thickness direction of the magnetic sleeve, the nut sleeve is located on the inner wall of the magnetic sleeve, and the magnet is located on the outer wall of the magnetic sleeve; The maximum distance between the axis of the nut sleeve and the limiting part is defined as S1, and the maximum distance between the axis of the nut sleeve and the outer wall of the magnet sleeve is defined as S2. Then S1≤S2. The nut sleeve is an injection molded part, and the lead screw nut assembly includes an internal thread. The internal thread is located on the inner wall of the nut sleeve, and the internal thread is integrally injection molded with the nut sleeve.

Images