Linear driving mechanism

Abstract

The invention provides a linear driving mechanism which comprises an integrated shell with the axial direction, a stator, a rotor, a first bearing, a second bearing, an output piece, a first cover body and a guide sleeve, wherein the stator, the rotor, the first bearing, the second bearing and the output piece are contained in the shell, the first cover body is fixed to the outer side of the first end, in the axial direction, of the shell, and the guide sleeve is fixed into the first cover body. The first bearing and the second bearing are arranged at intervals in the axial direction and are fixed to the shell, the rotor is rotatably connected to the shell through the first bearing and the second bearing, the stator is fixed to the shell and arranged between the first bearing and the second bearing, and the stator is used for driving the rotor to rotate; the first axial end of the output piece is in transmission connection with the rotor to form a lead screw nut pair, the second axial end of the output piece extends out of the shell and slidably penetrates through the guide sleeve, and the guide sleeve is used for enabling the output piece to move in the axial direction when the rotor rotates. According to the linear driving mechanism, the integration degree and the output force precision are improved, and the output force fluctuation is reduced.

Description

[Technical Field]

[0001] This invention relates to the field of linear drive technology, and more specifically to a linear drive mechanism. [Background Technology]

[0002] In the field of precision machinery such as robotics, linear drive mechanisms, as core components for achieving linear motion, directly affect the operational accuracy and stability of the entire device. In related technologies, the housing of a linear drive mechanism consists of a front housing and a rear housing that cooperate with each other. Key components such as the lead screw and nut pair, bearings, and guide sleeves need to be positioned and installed separately with the front housing and / or the rear housing. This decentralized assembly method inevitably generates cumulative system errors, leading to large fluctuations in the mechanism's output force and making it difficult to effectively control the accuracy of the output force. Furthermore, because some parts are installed on the front housing and others on the rear housing, not only is the integration level low and assembly difficult, but the performance of the linear drive mechanism is also easily affected by differences in assembly processes, resulting in poor product consistency, large performance fluctuations, and difficulty in meeting the application requirements of high precision and high stability. [Summary of the Invention]

[0003] The purpose of this invention is to provide a linear drive mechanism that solves the technical problems of low integration and unstable product performance in the prior art.

[0004] The technical solution of the present invention is as follows:

[0005] This invention provides a linear drive mechanism, comprising an integral housing in an axial direction, a stator, a rotor, a first bearing, a second bearing, and an output component housed within the housing, a first cover fixed to the outer side of a first end of the housing in the axial direction, and a guide sleeve fixed within the first cover. The first bearing and the second bearing are spaced apart in the axial direction and respectively fixed to the housing. The rotor is rotatably connected to the housing via the first bearing and the second bearing. The stator is fixed to the housing and disposed between the first bearing and the second bearing. The stator is used to drive the rotor to rotate. The output component is drivenly connected to the rotor at the first end in the axial direction to form a lead screw and nut pair. The output component extends out of the housing at the second end in the axial direction and slidably passes through the guide sleeve. The guide sleeve is used to move the output component along the axial direction when the rotor rotates.

[0006] Preferably, the first cover includes a first cover portion and a second cover portion. The first cover portion is detachably fixed to a first end of the housing. The first cover portion has a countersunk hole that penetrates the first cover portion along the axial direction. The countersunk hole includes a first hole segment and a second hole segment connected to one end of the first hole segment near the housing. The second cover portion is received within the first hole segment and fixed to the first cover portion. The second cover portion has a first clearance hole that penetrates the second cover portion along the axial direction. The guide sleeve is received within the first hole segment and held between the first cover portion and the second cover portion. The guide sleeve has a guide hole that penetrates the guide sleeve along the axial direction.

[0007] The output component is sequentially inserted through the second hole segment, the guide hole, and the first clearance hole. The output component has a gap with the hole wall of the second hole segment and the hole wall of the first clearance hole, and slides in cooperation with the guide hole.

[0008] Preferably, the end of the first cover away from the housing is provided with a first limiting groove that is recessed from the hole wall of the first hole segment into the hole wall;

[0009] The guide sleeve includes a guide sleeve body with a guide hole and a first limiting protrusion protruding from the circumference of the guide sleeve body. The guide sleeve body is inserted into the first hole section, and the first limiting protrusion is inserted into the first limiting groove.

[0010] Preferably, the guide hole wall includes two first planes symmetrically arranged about the axial direction and parallel to the axial direction, and two first arc surfaces respectively connected between the two first planes and located on the same cylindrical surface;

[0011] The output component includes a cylindrical outer surface and two second planes formed on the outer surface of the output component. The two second planes are symmetrically arranged about the axial direction and parallel to the axial direction. The second planes are arranged in a one-to-one correspondence with the first planes, and the second planes slide in contact with the corresponding first planes. The outer surface of the output component slides in contact with the two first arc surfaces.

[0012] Preferably, the second plane extends from the second end of the output member to the first end near the output member. The output member further includes a first limiting surface, which connects the end of the second plane near the first end of the output member and the outer surface of the output member. The first limiting surface is used to abut against the side surface of the guide sleeve facing the housing when the output member extends to its limit position along the axial direction, so as to limit the maximum extension stroke of the output member.

[0013] Preferably, the rotor includes a rotating shaft and a rotor magnet. The rotating shaft includes a first rod portion and a second rod portion connected as one piece and coaxially arranged. The first rod portion is a lead screw, and the rotor magnet is sleeved on the second rod portion.

[0014] The first bearing is disposed at the end of the second rod portion close to the first rod portion, and the second bearing is disposed at the end of the second rod portion away from the first rod portion;

[0015] The output component has a transmission hole and a receiving hole that are integrally connected along the axial direction. The transmission hole is located at the first end of the output component and is connected to the first rod in a transmission manner. The receiving hole extends from the transmission hole to the second end near the output component and is used to receive the first rod.

[0016] Preferably, the rotor further includes a rotor core fixed between the second rod portion and the rotor magnet, and the linear drive mechanism further includes a first locking member and a second locking member. The first locking member is threadedly connected to the housing and has a gap with the rotor core in the axial direction. The first bearing abuts between the rotor core and the first locking member. The second locking member is threadedly connected to the end of the second rod portion away from the first rod portion and has a gap with the rotor core in the axial direction. The second bearing abuts between the rotor core and the second locking member.

[0017] Preferably, the inner surface of the housing includes a cylindrical first surface that is arranged around the axial direction and close to the second rod and connected to one end of the first rod, and an annular planar second surface that is connected to the first surface away from the first rod and arranged around the axial direction. The outer surface of the first bearing is fixed to the first surface. The end face of the first bearing along the axial direction close to the rotor core abuts against the second surface and the rotor core. The other end face of the first bearing along the axial direction abuts against the first locking member.

[0018] Preferably, the linear drive mechanism further includes a second cover disposed at the second end of the housing in the axial direction. The second cover is inserted into the housing and has a gap with the stator. The second cover includes a cover body and a limiting ring. The cover body includes an inner surface and an outer surface that surround the axial direction and are disposed opposite to each other. The outer surface of the cover body is fixed to the inner surface of the housing. The limiting ring protrudes from the inner surface of the cover body and is located at one end of the cover body near the stator.

[0019] The outer surface of the second bearing is fixed to the inner surface of the main body of the cover. One end face of the second bearing along the axial direction, close to the rotor core, abuts against the limiting ring and the rotor core. The other end face of the second bearing along the axial direction abuts against the second locking member.

[0020] Preferably, the main body of the cover includes a first ring portion, a second ring portion spaced around the first ring portion, and a connecting portion connecting the first ring portion and the second ring portion. A limiting ring portion protrudes from the first ring portion, and the connecting portion is connected to the end of the first ring portion away from the limiting ring portion. The first ring portion, the second ring portion, and the connecting portion form a receiving groove. The inner surface of the housing includes a cylindrical third surface spaced from the first surface and arranged axially around the first rod portion, and a surface connected to the third surface near the first surface. A fourth annular planar surface is provided at one end and surrounding the axial direction; a gap exists between the third surface and the second surface; the stator includes a hollow cylindrical stator core and a stator coil; the stator core is fixed to the third surface, and one end of the stator core abuts against the fourth surface; a gap exists between the other end of the stator core and the second annular portion; the stator coil is fixed to the inner surface of the stator core; one end of the stator coil abuts against the fourth surface; and the other end of the stator coil is inserted into the receiving groove and has a gap between it and the second cover; and / or,

[0021] The linear drive mechanism further includes a third cover, a drive circuit board, an encoder, and a position magnet. The third cover is disposed on the outer side of the second end of the housing in the axial direction and is fixed to the second cover. The drive circuit board is fixed to the second cover. The encoder is fixed to the drive circuit board. The position magnet is fixed to the second locking member and is correspondingly disposed to the encoder.

[0022] The beneficial effects of this invention are as follows: In the linear drive mechanism of this invention, the first bearing, the second bearing, the stator, and the first cover are directly fixed to an integrated housing, effectively reducing the cumulative system error caused by the cooperation of multiple housings and the dispersed positioning of components, improving the accuracy of output force and reducing output force fluctuation. Simultaneously, the integrated housing simplifies the assembly process, increases the degree of integration, reduces the impact of assembly process differences on product performance, improves product consistency, and narrows the performance fluctuation range. Furthermore, the first cover is fixed to the axial outer side of the housing, and the guide sleeve installed inside the first cover can be kept away from the heat and potential oil contaminants generated by the stator and rotor during operation, reducing the impact of environmental factors on the sliding performance of the guide sleeve and extending its service life. If subsequent maintenance or replacement of the guide sleeve is required, only the first cover needs to be disassembled, avoiding contact with the stator, rotor, and other components caused by disassembling the housing. This reduces maintenance difficulty and avoids damaging the assembly benchmarks of internal components due to disassembly of the housing, thereby ensuring the original accuracy of the mechanism. [Attached Image Description]

[0023] Figure 1 This is a schematic diagram of the linear drive mechanism of the present invention;

[0024] Figure 2 for Figure 1 AA section view;

[0025] Figure 3 for Figure 1 The left view;

[0026] Figure 4 for Figure 3 BB cross-sectional view;

[0027] Figure 5 for Figure 1 Top view;

[0028] Figure 6 for Figure 1 A perspective view of the linear drive mechanism of the invention is shown.

[0029] Figure 7 for Figure 6 Exploded view;

[0030] Figure 8 This is a schematic diagram of the structure of the first cover in the linear drive mechanism of the present invention;

[0031] Figure 9 for Figure 8 Another perspective illustration;

[0032] Figure 10 This is a schematic diagram of the structure of the second cover in the linear drive mechanism of the present invention;

[0033] Figure 11This is a schematic diagram of the guide sleeve in the linear drive mechanism of the present invention;

[0034] Figure 12 This is a schematic diagram of the output component in the linear drive mechanism of the present invention;

[0035] Figure 13 This is a schematic diagram of the structure of the second cover in the linear drive mechanism of the present invention.

Detailed Implementation Methods

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0037] Please refer to Figures 1 to 13 This invention provides a linear drive mechanism 100, including a housing 1, a stator 2, a rotor 3, a first bearing 41, a second bearing 42, an output component 5, a first cover 61, and a guide sleeve 7. The housing 1 is a hollow, integral structure with an axial direction. The stator 2, rotor 3, first bearing 41, second bearing 42, and output component 5 are housed within the housing 1. The first cover 61 is fixed to the outer side of the first end 1a of the housing 1 in the axial direction of the linear drive mechanism 100, and the guide sleeve 7 is fixed within the first cover 61. The first bearing 41 and the second bearing 42 are spaced apart axially and are respectively fixed to the housing 1. The rotor 3 is rotatably connected to the housing 1 via the first bearing 41 and the second bearing 42. The stator 2 is fixed within the housing 1 and disposed between the first bearing 41 and the second bearing 42, and is used to drive the rotor 3 to rotate. The output component 5 is drivenly connected to the rotor 3 at its first axial end 5a to form a lead screw and nut pair with the rotor 3. The output component 5 extends out of the housing 1 at its second axial end 5b and slidably passes through the guide sleeve 7. The energized stator 2 drives the rotor 3 to rotate, and the guide sleeve 7 is used to move the output component 5 axially when the rotor 3 rotates.

[0038] In this embodiment of the invention, the first bearing 41, the second bearing 42, the stator 2, and the first cover 61 are directly fixed to the integrated housing 1, eliminating the need to divide the housing 1 into multiple units. This effectively reduces the cumulative system error caused by the cooperation of multiple housings and the dispersed positioning of components, improving the accuracy of the output force and reducing output force fluctuations. Simultaneously, the integrated housing 1 simplifies the assembly process, increases the degree of integration, reduces the impact of assembly process differences on product performance, improves product consistency, and narrows the performance fluctuation range. Furthermore, the first cover 61 is fixed to the axial outer side of the housing 1, and the guide sleeve 7 is installed inside the first cover 61, keeping it away from the heat and potential oil contaminants generated by the stator 2 and rotor 3 during operation within the housing 1. This reduces the impact of environmental factors on the sliding performance of the guide sleeve 7 and extends its service life. If subsequent maintenance or replacement of the guide sleeve 7 is required, only the first cover 61 needs to be disassembled, avoiding contact with components such as the stator 2 and rotor 3 caused by disassembling the housing 1. This reduces maintenance difficulty and prevents damage to the assembly reference of internal components due to disassembly of the housing 1, thereby ensuring the original accuracy of the mechanism. Meanwhile, the guide sleeve 7 is close to the end of the output component 5 that extends out of the housing 1, which can more accurately guide the axial movement of the output component 5, reduce the shaking of the extended end of the output component 5, and further improve the operational stability of the linear drive mechanism 100.

[0039] In some implementation methods, please refer to Figures 4 to 10 The first cover 61 includes a first cover portion 611 and a second cover portion 612. The first cover portion 611 is detachably fixed to the first end 1a of the housing 1, and a countersunk hole 6111 is formed on the first cover portion 6111. The countersunk hole 6111 extends axially through the first cover portion 6111, and includes a first hole section 61111 and a second hole section 61112. The second hole section 61112 is connected to the end of the first hole section 61111 near the housing 1. The second cover portion 612 is received within the first hole section 61111, and the second cover portion 612 is fixed to the first cover portion 611. A first clearance hole 6121 is formed on the second cover portion 612, and the first clearance hole 6121 extends axially through the second cover portion 612. The guide sleeve 7 is housed within the first bore section 61111 and is fixed between the first cover portion 611 and the second cover portion 612. A guide hole 71 is provided on the guide sleeve 7, extending axially through it. The output member 5 is sequentially disposed within the second bore section 61112, the guide hole 71, and the first clearance hole 6121. A gap exists between the output member 5 and the wall of the second bore section 61112, and a gap exists between the output member 5 and the wall of the first clearance hole 6121. Furthermore, the output member 5 is slidably engaged with the guide hole 71.

[0040] In related technologies, the guide sleeve is directly fixed to the housing with screws. The screws need to restrict the circumferential rotation of the guide sleeve and fix its axial position. If the screw tightening force is insufficient, the guide sleeve is prone to circumferential loosening or axial movement during the operation of the linear drive mechanism, affecting the fitting accuracy between the guide hole and the output component. In addition, if the guide sleeve is fixed inside the housing with screws, the structure of the housing itself will completely block the mating part between the screw and the threaded hole of the guide sleeve. The operator cannot visually observe the alignment and can only perform blind tightening, which not only prolongs the assembly time, but also easily damages the guide sleeve due to alignment deviation. Even if the assembly is barely completed, the guide sleeve may be misaligned, which may damage the coaxial reference between its guide hole and the output component, causing the subsequent output component to slide and jam, and increase friction, affecting the control accuracy and the overall performance of the mechanism. Moreover, when the guide sleeve needs to be disassembled for subsequent maintenance, the obstructed view will also increase the difficulty of disassembly and the risk of component damage.

[0041] In this embodiment, the guide sleeve 7 is fixed between the first cover 611 and the second cover 612, eliminating the need for screws to directly fix the guide sleeve 7. This avoids the force exerted on the guide sleeve 7 by the screws during screwing, preventing displacement and / or deflection of the guide sleeve 7. It also minimizes external force interference during the installation of the guide sleeve 7, further ensuring the coaxiality of the guide hole 71 and the output component 5, thereby further reducing friction and improving force control accuracy. Furthermore, in this embodiment, the second cover 612 is received and fixed within the first hole section 61111, and together with the first cover 611, it clamps and fixes the guide sleeve 7, ensuring the stability of the guide sleeve 7 in the axial position and preventing displacement of the guide sleeve 7 during the sliding of the output component 5, which would affect the guiding accuracy. Furthermore, the guide hole 71 on the guide sleeve 7 slides with the output component 5, providing stable guidance for the axial movement of the output component 5. The gap between the output component 5 and the walls of the second hole section 61112 and the first clearance hole 6121 effectively avoids frictional interference between the output component 5 and the first cover 611 and the second cover 612 during movement, reducing component wear and further ensuring the stability and accuracy of the linear motion of the output component 5. Moreover, the first cover 611 is detachably fixed to the housing 1, which not only facilitates installation and removal from the housing 1 but also facilitates subsequent inspection and maintenance of components such as the stator 2 and rotor 3 inside the housing 1.

[0042] In some embodiments, the first cover 611 further includes a first anti-rotation structure formed on the wall of the first hole 61111, and the guide sleeve 7 includes a second anti-rotation structure that fits into the first anti-rotation structure. The first anti-rotation structure and the second anti-rotation structure cooperate to effectively prevent the guide sleeve 7 from rotating within the first hole 61111.

[0043] As one implementation method, please refer to Figure 5 , Figure 6 , Figure 8 and Figure 9The first anti-rotation structure is a first limiting groove 6112 located at the end of the first cover 611 away from the housing 1, the first limiting groove 6112 being recessed into the hole wall of the first hole section 61111. The guide sleeve 7 also includes a guide sleeve body 72, with a guide hole 71 formed on the guide sleeve body 72. The second anti-rotation structure is a first limiting protrusion 73 protruding from the outer periphery of the guide sleeve body 72. The guide sleeve body 72 is inserted into the first hole section 61111, and the first limiting protrusion 73 is inserted into the first limiting groove 6112. The engagement of the first limiting protrusion 73 and the first limiting groove 6112 restricts the circumferential rotational freedom of the guide sleeve 7. Therefore, under the action of the first cover 611 and the second cover 612, the guide sleeve 7 remains relatively fixed to the housing 1. The guide hole 71 of the guide sleeve 7 is slidably engaged with the output component 5, and the output component 5 is drivenly connected to the rotor 3 to form a lead screw and nut pair. When the rotor 3 rotates under the action of the stator 2 after being energized, the output component 5 tends to rotate with the rotor 3 due to the action of the rotor 3. However, the guide hole 71 of the guide sleeve 7 forms a circumferential constraint on the output component 5, and the guide sleeve 7 itself cannot rotate, thus restricting the circumferential rotation of the output component 5, so that the output component 5 can only move linearly along the axial direction of the guide hole 71.

[0044] As an example, please refer to Figure 8 and Figure 11 The outer circumferential surface of the guide sleeve body 72 is cylindrical, and correspondingly, the wall of the first hole section 61111 is also cylindrical. Compared to the polygonal outer circumferential surface of the guide sleeve body 72, inserting the cylindrical guide sleeve 7 into the first cover 611 eliminates the need for precise alignment of the corners, allowing for quick assembly and avoiding the assembly difficulties caused by the high requirements for corner alignment on polygonal surfaces. Moreover, when clamped by the first cover 611 and the second cover 612, the cylindrical surface ensures uniform circumferential force on the guide sleeve 7, preventing localized deformation caused by force concentration at the corners of polygonal surfaces. Furthermore, the cylindrical surface ensures that the guide sleeve 7 maintains stable coaxiality within the first hole section 61111, ensuring precise alignment between the guide hole 71 and the output component 5, avoiding skewness of the guide sleeve 7 caused by uneven contact between the sides and the hole wall on polygonal surfaces, and thus preventing fluctuations in the fit clearance between the output component 5 and the guide hole 71. Meanwhile, the edges and corners of polygonal surfaces are prone to additional friction or even scratching with the hole wall, while cylindrical surfaces are smooth and without sharp edges. The contact friction between the guide sleeve main body 72 with a cylindrical outer surface and the hole wall of the first hole segment 61111 is much less than the contact friction between the guide sleeve main body 72 with a polygonal outer surface and the hole wall of the first hole segment 61111. Therefore, this embodiment can effectively reduce component wear, and the cylindrical surface processing technology is mature and the surface roughness is easy to control, which can reduce production costs and ensure the long-term stability of the guide sleeve 7 after installation.

[0045] As an example, there are two of each of the first and second anti-rotation structures. For instance, the first cover 611 has two first limiting grooves 6112, which are symmetrically arranged about the axial direction, that is, the two first limiting grooves 6112 are symmetrically arranged about the axis L1 of the housing 1. Correspondingly, the guide sleeve 7 includes two first limiting protrusions 73, which are symmetrically arranged about the axis L1 of the housing 1. Furthermore, the first limiting protrusions 73 and the first limiting grooves 6112 are arranged in a one-to-one correspondence, and the first limiting protrusions 73 are inserted into the corresponding first limiting grooves 6112. In this embodiment, the one-to-one engagement of the first limiting protrusions 73 and the first limiting grooves 6112 can restrict the circumferential rotation of the guide sleeve 7 while making the force on the guide sleeve 7 more even, avoiding the guide sleeve 7 being subjected to force on one side, and further ensuring the stability of the guide sleeve 7 installation and the smoothness of the guidance.

[0046] It should be noted that in other embodiments, the first anti-rotation structure and the second anti-rotation structure can be other structures, as long as the two work together to prevent the guide sleeve from rotating relative to the first cover.

[0047] As one implementation method, please refer to Figure 2 , Figure 4 , Figure 8 and Figure 9 The first cover portion 611 includes a cover structure 6113 and a second limiting protrusion 6114. A countersunk hole 6111 is formed on the cover structure 6113. The side surface of the cover structure 6113 facing the housing 1 is a fifth surface 61131. The fifth surface 61131 of the cover structure 6113 abuts against the first end face 11 of the housing 1. The second limiting protrusion 6114 protrudes from the fifth surface 61131 of the cover structure 6113. The second limiting protrusion 6114 is arranged around the countersunk hole 6111 at intervals and is inserted into the housing 1. As an example, the second limiting protrusion 6114 can be an annular structure. The outer surface of the second limiting protrusion 6114 abuts against the inner surface of the housing 1, and the inner surface of the second limiting protrusion 6114 is radially spaced from the hole wall of the countersunk hole 6111.

[0048] In this embodiment, the fifth surface 61131 of the cover structure 6113 directly abuts against the first end face 11 of the housing 1, which can quickly achieve axial positioning of the first cover 611 and the housing 1. The second limiting protrusion 6114, which protrudes from the fifth surface 61131 and surrounds the countersunk hole 6111 at intervals, abuts against the inner surface of the housing 1 after being inserted into the housing 1, thereby achieving circumferential positioning of the first cover 611 and the housing 1. This effectively improves the coaxiality of the first cover 611 and the housing 1, avoids circumferential offset or radial wobbling of the first cover 611 during assembly or operation, and ensures that the axis of the countersunk hole 6111 is consistent with the axis L1 of the housing 1. In addition, the annular second limiting protrusion 6114 fits against the inner surface of the housing 1, which can form a sealing effect between the first cover 611 and the housing 1, reducing the entry of external dust and impurities into the housing 1, while enhancing the overall stability and preventing the first cover 611 from loosening due to vibration after long-term use.

[0049] In some embodiments, a third anti-rotation structure is formed on the wall of the guide hole 71, and a fourth anti-rotation structure is formed on the outer surface of the output member 5, which is fitted and slidably connected with the third anti-rotation structure. The cooperation between the third anti-rotation structure and the fourth anti-rotation structure can effectively prevent the output member 5 from rotating.

[0050] As one implementation method, please refer to Figure 2 , Figure 4 , Figure 6 , Figure 11 and Figure 12 The guide hole 71 has two first planes 711 and two first arc surfaces 712. The first planes 711 are the third anti-rotation structure. The first planes 711 and the first arc surfaces 712 together define the guide hole 71. The two first planes 711 are symmetrically arranged about the axis L1 of the housing 1 and are parallel to the axis L1. The two first arc surfaces 712 are symmetrically arranged about the axis L1 of the housing 1 and are respectively connected between the two first planes 711. The two first arc surfaces 712 are located on the same cylindrical surface. The output component 5 includes an outer surface 51 and two second planes 52. The outer surface 51 of the output component 5 is cylindrical. The second planes 52 are the fourth anti-rotation structure. The two second planes 52 are respectively opened on the outer surface 51 of the output component 5. The two second planes 52 are symmetrically arranged about the axis L1 of the housing 1. The two second planes 52 are parallel to the axis L1. The second planes 52 are arranged in one-to-one correspondence with the first planes 711, and the second planes 52 slide in contact with the corresponding first planes 711. The outer surface 51 of the output component 5 slides in contact with the two first arc surfaces 712.

[0051] In this embodiment, the two first planes 711 of the guide hole 71 and the two second planes 52 of the output component 5 slide in a one-to-one correspondence. This not only effectively restricts the circumferential rotational freedom of the output component 5, ensuring that the output component 5 only moves linearly along the axial direction, avoiding motion conversion failure caused by the synchronous rotation of the output component 5 with the rotor 3, but also avoids jamming or wear caused by excessive force on one side, ensuring force control accuracy and stability. At the same time, the two first arc surfaces 712 of the guide hole 71 are located on the same cylindrical surface and slide in contact with the cylindrical outer surface 51 of the output component 5. This not only reduces the frictional resistance between the output component 5 and the guide hole 71, but also provides stable radial support for the output component 5, improving the coaxiality of the output component 5 during movement and preventing radial offset or wobbling of the output component 5. Moreover, the outer surface 51 of the output component 5 is cylindrical, which not only has mature processing technology and easy surface roughness control, but also reduces the frictional resistance between the output component 5 and the guide hole 71, reduces component wear, ensures smooth sliding, achieves low frictional resistance of the output component 5, and achieves relatively high thrust output.

[0052] As one implementation method, please refer to Figure 11 A first clearance groove 713 is provided at the connection between the first plane 711 and the first arc surface 712. The groove surface of the first clearance groove 713 is located on a cylindrical surface whose axis is parallel to the axis L1 of the housing 1. If the connection between the first plane 711 and the first arc surface 712 is a right angle or a sharp transition, the outer surface 51 of the output component 5 (especially the junction between the second plane 52 and the cylindrical outer surface 51) is prone to frictional interference with the connection between the first plane 711 and the first arc surface 712 during the sliding process, and may even cause scratching wear. The first clearance groove 713 can reduce the sliding friction resistance between the output component 5 and the guide hole 71, reduce the wear rate of the components, and extend the service life of the guide sleeve 7 and the output component 5. In addition, the first clearance groove 713 can reduce stress concentration and reduce the risk of cracks in the guide hole 71 due to long-term stress or vibration.

[0053] As one implementation method, please refer to Figure 5The housing 1 has a first radial line L2 and a second radial line L3 that pass through axis L1 and are perpendicular to each other. Two first limiting protrusions 73 are symmetrically arranged on the first radial line L2, and two first planes 711 are symmetrically arranged on the second radial line L3. In this embodiment, the two first limiting protrusions 73 (used to achieve circumferential anti-rotation of the first cover 61 to the guide sleeve 7) are symmetrically arranged on the first radial line L2 passing through axis L1, and the two first planes 711 (which cooperate with the second plane 52 of the output member 5 to achieve circumferential anti-rotation of the guide sleeve 7 to the output member 5) are symmetrically arranged on the second radial line L3 passing through axis L1 and perpendicular to the first radial line L2, so that the two circumferential anti-rotation constraints are orthogonally distributed, which can avoid mutual interference between the two anti-rotation effects. When the guide sleeve 7 is subjected to circumferential force due to the sliding of the output component 5, the anti-rotation constraint of the first cover 61 on the guide sleeve 7 is concentrated in the direction perpendicular to the first radial line L2, while the anti-rotation constraint of the guide sleeve 7 on the output component 5 is concentrated in the direction perpendicular to the second radial line L3. This can avoid the situation where the superposition of forces causes an overload or failure of a certain anti-rotation structure.

[0054] In some implementation methods, please refer to Figure 2 , Figure 7 and Figure 12 The second plane 52 extends from the second end 5b of the output member 5 to the first end 5a near the output member 5. The output member 5 also includes a first limiting surface 53, which connects the end of the second plane 52 near the first end 5a of the output member 5 and the outer surface 51 of the output member 5. When the output member 5 extends axially to its limit position, the first limiting surface 53 abuts against the side surface of the guide sleeve 7 facing the housing 1, thereby limiting the maximum extension stroke of the output member 5 and preventing the output member 5 from overextending and moving completely outside the housing 1, thus avoiding the risk of transmission failure or the output member 5 falling and being damaged. Moreover, the first limiting surface 53 is connected between the second plane 52 and the outer surface 51 of the output member 5, requiring no additional welding or assembly, resulting in a simple structure and high strength. Furthermore, compared to methods relying on electronic limits or external stops, the mechanical abutment limit between the first limiting surface 53 and the guide sleeve 7 is more direct and reliable, eliminating the need for additional electronic components such as sensors and controllers, simplifying the assembly process, reducing costs, and being unaffected by electronic failures or signal interference, effectively limiting movement even under complex working conditions.

[0055] As one implementation method, please refer to Figure 2 The first limiting surface 53 is a plane perpendicular to the axis L1, and the side surface of the guide sleeve 7 facing the housing 1 is also a plane perpendicular to the axis L1. When the output component 5 extends to its limit position, the first limiting surface 53 completely fits and abuts against the side surface of the guide sleeve 7 facing the housing 1, ensuring that the limiting force is evenly distributed, avoiding local stress concentration that could cause component deformation, and improving the limiting accuracy.

[0056] It should be noted that in other embodiments, the third and fourth anti-rotation structures can also be other structures. For example, the third anti-rotation structure can be a keyway, and the fourth anti-rotation structure can be a spline or a flat key; or, the third anti-rotation structure can be a snap-fit ​​part, and the fourth anti-rotation structure can be a snap-fit ​​groove. It is understood that as long as the third and fourth anti-rotation structures cooperate to prevent the guide sleeve from rotating relative to the first cover, it is sufficient. The design can be adjusted according to actual conditions and will not be elaborated upon here.

[0057] In some implementation methods, please refer to Figure 2 and Figure 10 The second cover portion 612 includes a cover plate 6122, a first flange 6123, and a second flange 6124. A first clearance hole 6121 is provided on the cover plate 6122. The first flange 6123 bends from the edge of the cover plate 6122 towards the housing 1. The second flange 6124 bends outward from the end of the first flange 6123 away from the cover plate 6122 (i.e., away from the axis L1 of the housing 1). The first flange 6123 and the second flange 6124 enhance the structural strength of the second cover portion 612. The cover plate 6122 and the first flange 6123 form a receiving cavity 6125. The guide sleeve main body portion 72 includes a sleeve structure 721 and a boss structure 722. The boss structure 722 protrudes from the side of the sleeve structure 721 away from the housing 1. A guide hole 71 penetrates the boss structure 722 and the sleeve structure 721. A first limiting protrusion 73 protrudes from the outer periphery of the sleeve structure 721. The boss structure 722 is housed within the receiving cavity 6125 and abuts against the cover plate 6122. The side surface of the sleeve structure 721 with the boss structure 722 abuts against the side surface of the second flange 6124 facing the housing 1. This not only enables quick and effective positioning of the guide sleeve 7 and the second cover 612, improving assembly efficiency and accuracy, but also reliably fixes the guide sleeve 7 between the second cover 612 and the first cover 611. Furthermore, it reduces the entry of external dust into the guide sleeve 7, ensuring a smooth sliding fit environment between the guide hole 71 and the output component 5, and further improving the transmission stability and service life of the linear drive mechanism 100.

[0058] As an example, please refer to Figure 5 and Figure 6The first cover 61 also includes a first screw 613, which passes through the second cover 612 and the first cover 611 in sequence and is threaded onto the housing 1, thereby fixing the first cover 611, the second cover 612, and the housing 1. In some examples, the second cover 612 also includes a fifth limiting protrusion 6126, which extends straight outward from the second flange 6124 (i.e., away from the axis L1 of the housing 1). There are multiple fifth limiting protrusions 6126, all of which are spaced around the axis L1 of the housing 1. For example, there are four fifth limiting protrusions 6126. The first cover 611 is also provided with a second limiting groove 6115. The end of the second limiting groove 6115 that is away from the housing 1 from the first cover 611 is recessed inward and communicates with the countersunk hole 6111. The number of second limiting grooves 6115 is the same as the number of fifth limiting protrusions 6126, and the second limiting grooves 6115 and the fifth limiting protrusions 6126 are arranged in a one-to-one correspondence. The fifth limiting protrusions 6126 are inserted into the corresponding second limiting grooves 6115. The first screw 613 passes through the fifth limiting protrusions 6126 and the first cover 611 in sequence and is then threaded to the housing 1.

[0059] In this embodiment, the fifth limiting protrusion 6126 is inserted into the corresponding second limiting groove 6115, which can quickly and effectively achieve circumferential positioning of the first cover 611 and the second cover 612, avoiding relative rotation between the two during assembly or subsequent use. At the same time, it provides an alignment reference for the drilling of the first screw 613, solving the problem of hole alignment difficulties caused by component misalignment when inserting screws in traditional methods, improving assembly efficiency, and enhancing the vibration resistance of the overall structure. In addition, the first screw 613 is threaded onto the housing 1 after passing through the fifth limiting protrusion 6126 and the first cover 611 in sequence. The tightening force of the first screw 613 firmly fixes the first cover 611 and the second cover 612 to the housing 1 as one unit. The cooperation of the fifth limiting protrusion 6126 and the second limiting groove 6115 can also evenly distribute the locking force of the first screw 613 to the circumference of the first cover 611 and the second cover 612.

[0060] In some implementation methods, please refer to Figure 2 , Figure 4 and Figure 7The rotor 3 includes a shaft 31 and a rotor magnet 32. The shaft 31 is an integral structure and includes a first rod portion 311 and a second rod portion 312 connected as one piece and coaxially arranged. The first rod portion 311 is a lead screw. The rotor 3 also includes a rotor magnet 32, which is sleeved on the second rod portion 312. A first bearing 41 is disposed at the end of the second rod portion 312 near the first rod portion 311, and a second bearing 42 is disposed at the end of the second rod portion 312 away from the first rod portion 311. The output component 5 has a transmission hole 54 and a receiving hole 55, which are connected as one piece along the axial direction. The transmission hole 54 is opened at the first end 5a of the output component 5 and is connected to the first rod portion 311 in a transmission manner. The receiving hole 55 extends from the transmission hole 54 to the second end 5b near the output component 5. The receiving hole 55 is used to receive the first rod portion 311, and there is a gap between the hole wall of the receiving hole 55 and the outer peripheral surface of the first rod portion 311.

[0061] In this embodiment, the rotating shaft 31 serves as the lead screw in the lead screw and nut assembly, and the output component 5 serves as the lead screw nut in the lead screw and nut assembly. The outer diameter of the output component 5 is larger than that of the rotating shaft 31, allowing for a more stable connection to external loads. Furthermore, the output component 5 can also house and protect the rotating shaft 31, preventing external dust, impurities, or external force collisions from damaging the lead screw, eliminating the need for additional protective structures. Moreover, the rotating shaft 31 is a one-piece structure, avoiding coaxiality deviations caused by assembly errors in a split rotating shaft 31, and reducing force loss during transmission, ensuring that the first rod portion 311 rotates synchronously and stably with the second rod portion 312. The receiving hole 55 extends from the transmission hole 54 to the second end 5b near the output component 5, allowing for the reception of a portion of the first rod portion 311 as the output component 5 extends and retracts axially, effectively utilizing the internal space of the output component 5.

[0062] As one implementation method, please refer to Figure 2 and Figure 4 The end of the first rod portion 311 away from the second rod portion 312 extends out of the first cover 61, which can provide the output member 5 with a longer axial movement stroke as much as possible. Furthermore, when the output member 5 moves to its limit extension stroke, the first rod portion 311 extending out of the first cover 61 can still be partially received in the receiving hole 55 of the output member 5, ensuring that the transmission hole 54 of the output member 5 and the first rod portion 311 are always engaged, and preventing the output member 5 from disengaging from the first rod portion 311 due to excessive extension.

[0063] As one implementation method, please refer to Figure 2 , Figure 4 and Figure 7The rotor 3 also includes a rotor core 33, which is sleeved and fixed outside the second rod portion 312. The inner surface of the rotor core 33 is fixed to the second rod portion 312, and the outer surface of the rotor core 33 is fixed to the rotor magnet 32. The linear drive mechanism 100 also includes a first locking member 81 and a second locking member 82. The first locking member 81 is threaded into the housing 1, and there is an axial gap between the first locking member 81 and the rotor core 33. A first bearing 41 abuts between the rotor core 33 and the first locking member 81. The second locking member 82 is threaded into the end of the second rod portion 312 away from the first rod portion 311, and there is an axial gap between the second locking member 82 and the rotor core 33. A second bearing 42 abuts between the rotor core 33 and the second locking member 82.

[0064] In this embodiment, the rotor core 33 is sleeved and fixed outside the second rod portion 312. The inner and outer surfaces of the rotor core 33 are fixed to the second rod portion 312 and the rotor magnet 32, respectively. The rotor core 33 abuts against the first bearing 41 and the second bearing 42 at both ends in the axial direction, effectively fixing the rotor magnet 32 ​​to the rotating shaft 31. This ensures a uniform gap between the rotor magnet 32 ​​and the stator 2, guarantees magnetic circuit stability, reduces magnetic loss, and improves driving force output efficiency. Furthermore, the axial clearance between the first locking member 81 and the second locking member 82 and the rotor core 33 can be adjusted by turning them, facilitating fine-tuning of the bearing preload. This effectively limits the movement and wobbling of the rotating shaft 31, preventing noise and wear.

[0065] As an example, please refer to Figure 2 and Figure 4 The inner surface of the housing 1 includes a first surface 12 and a second surface 13. The first surface 12 is a cylindrical surface arranged around the axis L1 of the housing 1, and the first surface 12 is connected to one end of the first rod 311 near the second rod 312. The second surface 13 is connected to the end of the first surface 12 away from the first rod 311, and the second surface 13 is an annular plane arranged around the axis L1 of the housing 1. In this embodiment, the outer surface of the first bearing 41 is fixed to the first surface 12, the end face of the first bearing 41 along the axial direction near the rotor core 33 abuts against the second surface 13 and the rotor core 33, and the other end face of the first bearing 41 along the axial direction abuts against the first locking member 81. Specifically, the outer surface of the outer ring of the first bearing 41 is fixed to the first surface 12, the end face of the outer ring of the first bearing 41 near the rotor core 33 abuts against the second surface 13, the other end face of the outer ring of the first bearing 41 abuts against the first locking member 81, and the end face of the inner ring of the first bearing 41 abuts against the end face of the rotor core 33 away from the second bearing 42. This can achieve axial positioning of the first bearing 41 and prevent the first bearing 41 from moving.

[0066] As an example, the first locking member 81 and the second locking member 82 are lock nuts. The first locking member 81 has an external thread that is threaded to the housing 1. The inner surface of the housing 1 also includes an eighth surface 14, which is located on the side of the first surface 12 away from the second surface 13. The eighth surface 14 is threaded, and the threaded eighth surface 14 defines a threaded hole that is threaded to the first locking member 81. The minor diameter of the threaded hole is larger than the outer diameter of the first bearing 41, thereby preventing the outer surface of the first bearing 41 from rubbing against the wall of the threaded hole when the first bearing 41 is installed. The second locking member 82 has an internal thread that is threaded to the second rod portion 312. The end of the second rod portion 312 away from the first rod portion 311 has an external thread that is threaded to the second locking member 82.

[0067] In some examples, please refer to Figure 2 and Figure 4 A second annular clearance groove 15 is formed between the first surface 12 and the eighth surface 14. The diameter of the cylindrical surface containing the bottom surface 151 of the second clearance groove 15 is larger than the minor diameter of the threaded hole. The first locking member 81 includes a threaded portion 811 and a third limiting protrusion 812. The threaded portion 811 is threaded into the threaded hole. The third limiting protrusion 812 protrudes from the threaded portion 811 on the side near the first bearing 41. The third limiting protrusion 812 has an annular structure. The diameter of the outer surface of the third limiting protrusion 812 is smaller than the minor diameter of the threaded portion 811. The end of the third limiting protrusion 812 away from the threaded portion 811 abuts against the end of the outer ring of the first bearing 41 away from the second bearing 42.

[0068] In this embodiment, the diameter of the bottom surface 151 of the second clearance groove 15 between the first surface 12 and the eighth surface 14 of the housing 1 is larger than the minor diameter of the threaded hole. This provides a receiving space for the third limiting protrusion 812 of the first locking member 81, preventing the third limiting protrusion 812 from rubbing against the surface of the housing 1, and also eliminates stress concentration at the transition between the first surface 12 and the eighth surface 14, thereby improving the structural strength of the housing 1. Moreover, the second clearance groove 15 can also prevent the first bearing 41 from rubbing against the threaded hole during assembly or operation, ensuring smooth assembly and stable operation of the first bearing 41. The end face of the third limiting protrusion 812 abuts against the end of the outer ring of the first bearing 41 away from the second bearing 42, avoiding uneven local force caused by the threaded part 811 of the first locking member 81 directly contacting the first bearing 41, thereby effectively limiting the axial position of the first bearing 41.

[0069] In some implementation methods, please refer to Figure 2 , Figure 4 , Figure 7 and Figure 13The linear drive mechanism 100 also includes a second cover 62, which is disposed within the second end 1b of the housing 1 in the axial direction, and has a gap between the second cover 62 and the stator 2. The second cover 62 includes a cover body portion 621 and a limiting ring portion 622. The cover body portion 621 includes an inner surface 6211 and an outer surface 6212 disposed opposite to each other. Both the inner surface 6211 and the outer surface 6212 of the cover body portion 621 are disposed around the axis L1 of the housing 1. The outer surface 6212 of the cover body portion 621 is fixed to the inner surface of the housing 1. The limiting ring portion 622 protrudes from the inner surface 6211 of the cover body portion 621, and is located at the end of the cover body portion 621 near the stator 2. The outer surface of the second bearing 42 is fixed to the inner surface 6211 of the main body 621 of the cover. One end face of the second bearing 42, axially close to the rotor core 33, abuts against the limiting ring 622 and the rotor core 33. The other end face of the second bearing 42, axially close to the rotor core 33, abuts against the second locking member 82. Specifically, the outer surface of the outer ring of the second bearing 42 is fixed to the inner surface 6211 of the main body 621 of the cover. One end of the outer ring of the second bearing 42, close to the rotor core 33, abuts against the limiting ring 622. One end of the inner ring of the second bearing 42 abuts against the rotor core 33, and the other end of the inner ring abuts against the second locking member 82. In this embodiment, the outer ring of the second bearing 42 abuts against the limiting ring 622, and the inner ring of the second bearing 42 abuts against the rotor core 33 and the second locking member 82, which achieves axial positioning of the second bearing 42 and prevents it from shifting.

[0070] As one implementation method, please refer to Figure 2 , Figure 4 and Figure 13The main body 621 of the cover includes a first ring portion 6213, a second ring portion 6214, and a connecting portion 6215. A limiting ring portion 622 protrudes from the first ring portion 6213, and the second ring portion 6214 is spaced around the first ring portion 6213. The connecting portion 6215 is connected between the first ring portion 6213 and the second ring portion 6214, and the connecting portion 6215 is located at the end of the first ring portion 6213 away from the limiting ring portion 622. The first ring portion 6213, the second ring portion 6214, and the connecting portion 6215 form a receiving groove 6216. The inner surface of the housing 1 also includes a third surface 16 and a fourth surface 17. The third surface 16 is spaced at the end of the first surface 12 away from the first rod portion 311. The third surface 16 has a cylindrical structure arranged around the axis L1 of the housing 1. The fourth surface 17 is connected to the end of the third surface 16 near the first surface 12. Furthermore, there is a gap between the third surface 16 and the second surface 13. The fourth surface 17 has an annular planar structure arranged around the axis L1 of the housing 1. The stator 2 includes a hollow cylindrical stator core 21 and a stator coil 22. The stator core 21 is fixed to the third surface 16, and one end of the stator core 21 abuts against the fourth surface 17. The other end of the stator core 21 has a gap with the second ring portion 6214. The stator coil 22 is fixed to the inner surface of the stator core 21. One end of the stator coil 22 abuts against the fourth surface 17. The other end of the stator coil 22 is inserted into the receiving groove 6216 and has a gap with the second cover 62. The stator coil 22 is spaced around the rotor magnet 32.

[0071] In this embodiment, the receiving groove 6216 formed by the first ring portion 6213, the second ring portion 6214, and the connecting portion 6215 can accommodate one end of the stator coil 22. The second cover 62 has a gap with the stator coil 22. While fully utilizing the internal space of the second cover 62 to form a protective enclosure for the stator coil 22, it also effectively avoids mutual squeezing interference caused by thermal expansion and contraction or assembly errors, preventing deformation of the stator core 21 or damage to the insulation layer of the stator coil 22, thus extending the service life of the components. The outer surface of the stator core 21 is fixed to the third surface 16, one end of the stator coil 22 abuts against the fourth surface 17, and the other end of the stator coil 22 is inserted into the receiving groove 6216. This not only effectively limits and fixes the stator 2, but also ensures the coaxiality of the stator 2 and the rotor magnet 32, ensuring a uniform gap between them, reducing magnetic loss, and increasing driving force.

[0072] As one implementation method, please refer to Figure 2 and Figure 4The inner surface of the housing 1 also includes a sixth surface 18 and a seventh surface 19. The sixth surface 18 is a cylindrical structure arranged around the axis L1 of the housing 1. The seventh surface 19 is connected to the sixth surface 18 and is a frustum-shaped structure arranged around the axis L1 of the housing 1, with the diameter of the frustum gradually decreasing away from the sixth surface 18. An annular limiting surface 6217 is formed at the end of the cover body 621 facing the stator 2. The annular limiting surface 6217 connects the outer surface 6212 of the cover body 621 and the end face of the cover body 621 facing the stator 2. The annular limiting surface 6217 is a frustum-shaped structure arranged around the axis L1 of the housing 1. When the second cover 62 is inserted into the housing 1, the outer surface 6212 of the cover body 621 abuts against the sixth surface 18, and the annular limiting surface 6217 abuts against the seventh surface 19.

[0073] In this embodiment, when the second cover 62 is inserted into the housing 1, the outer surface 6212 of the cover body 621 abuts against the sixth surface 18, preventing circumferential displacement of the second cover 62 during assembly and ensuring the coaxiality of the inner surface of the cover body 621 with the outer ring of the second bearing 42. Both the annular limiting surface 6217 and the seventh surface 19 are frustoconical surfaces with diameters gradually decreasing away from the sixth surface 18. When they are in contact, they can form axial and radial limiting, which can both restrict the excessive insertion of the second cover 62 into the housing 1 and uniformly transmit the axial force on the second cover 62 to the housing 1 through the inclined structure of the frustoconical surface, avoiding local stress concentration that could cause deformation of the second cover 62 or the housing 1.

[0074] In some implementation methods, please refer to Figures 1 to 4 , Figure 6 and Figure 7The linear drive mechanism 100 also includes a third cover 63, a drive circuit board 91, an encoder 92, and a position magnet 93. The third cover 63 is disposed on the outer side of the second axial end 1b of the housing 1 and fixed to the second cover 62. The drive circuit board 91 is fixed to the second cover 62, the encoder 92 is fixed to the drive circuit board 91, and the position magnet 93 is fixed to the second locking member 82 and correspondingly disposed to the encoder 92. The position magnet 93 can rotate synchronously with the rotor 3, and the encoder 92 can detect the rotation state of the position magnet 93 in real time to obtain the rotational speed and angular position information of the rotor 3. In this embodiment, the third cover 63 is disposed on the outer side of the second axial end 1b of the housing 1 and fixed to the second cover 62, which can effectively protect the internal drive circuit board 91 and encoder 92, isolating them from external dust, moisture, and impact. Meanwhile, the drive circuit board 91 and encoder 92 are located outside the housing 1, which not only avoids occupying the installation space of the transmission components inside the housing 1, but also allows for subsequent maintenance of the drive circuit board 91 and encoder 92 by simply removing the third cover 63 without disassembling the components inside the housing 1. This reduces maintenance difficulty and assembly deviation risk, and improves the practicality and reliability of the linear drive mechanism 100.

[0075] As one implementation method, please refer to Figure 13 The second cover 62 may further include two fourth limiting protrusions 623, which are axially symmetrical about the axis L1 of the housing 1. The fourth limiting protrusions 623 protrude from the end of the cover body 621 away from the stator 2 and extend axially into the third cover 63. As an example, the fourth limiting protrusions 623 have a ninth surface 6231, with the opposite side of the two fourth limiting protrusions 623 being the ninth surface 6231. The inner surface of the third cover 63 abuts against the ninth surface 6231 of the fourth limiting protrusions 623, and the end face of the third cover 63 near the housing 1 abuts against the end face of the second end 1b of the housing 1. Please refer to [reference needed]. Figures 1 to 4 The linear drive mechanism 100 also includes two second screws 64, which are arranged one-to-one with the fourth limiting protrusion 623. The second screws 64 are radially inserted into the third cover 63 and threadedly connected to the fourth limiting protrusion 623.

[0076] In this embodiment, two fourth limiting protrusions 623 are symmetrically arranged about axis L1 and inserted into the third cover 63, thereby providing circumferential positioning for the third cover 63, preventing the third cover 63 from shifting, preventing it from loosening due to vibration or other reasons after long-term use, and ensuring its protective effect on the internal drive circuit board 91 and encoder 92. At the same time, the end face of the third cover 63 near the housing 1 abuts against the end face of the second end 1b of the housing 1, forming an axial limit, preventing the third cover 63 from moving axially, and improving the installation accuracy of the third cover 63. In addition, the second screw 64 passes radially through the third cover 63 and is threadedly connected to the fourth limiting protrusions 623 one by one. This not only effectively fixes the third cover 63 and the second cover 62, but also avoids spatial interference to the internal electronic components (such as the drive circuit board 91, encoder 92, etc.) of the third cover 63 compared to axial screw fixing.

[0077] In some implementation methods, please refer to Figures 1 to 4 as well as Figure 7 The output component 5 includes a transmission cylinder portion 56 and a flange portion 57. A transmission hole 54 and a receiving hole 55 are formed on the transmission cylinder portion 56. The flange portion 57 is threadedly connected to the end of the transmission cylinder portion 56 away from the rotor 3, i.e., the flange portion 57 is located at the second end 5b of the output component 5, which facilitates quick connection to external loads. A second plane 52 extends from the flange portion 57 to the transmission cylinder portion 56, and a first limiting surface 53 is formed on the outer surface of the transmission cylinder portion 56.

[0078] It should be noted that in other embodiments, the rotor may be the lead screw and nut in the lead screw and nut pair, and the output component may be the lead screw in the lead screw and nut pair. This can be set according to the actual situation, and will not be elaborated here.

[0079] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A linear drive mechanism, characterized in that, The device includes an integral housing in an axial direction, a stator, a rotor, a first bearing, a second bearing, and an output component housed within the housing, a first cover fixed to the outer side of the first end of the housing in the axial direction, and a guide sleeve fixed within the first cover. The first bearing and the second bearing are spaced apart in the axial direction and fixed to the housing respectively. The rotor is rotatably connected to the housing via the first bearing and the second bearing. The stator is fixed to the housing and disposed between the first bearing and the second bearing. The stator is used to drive the rotor to rotate. The output component is drivenly connected to the rotor at the first end in the axial direction to form a lead screw and nut pair. The output component extends out of the housing at the second end in the axial direction and slidably passes through the guide sleeve. The guide sleeve is used to move the output component along the axial direction when the rotor rotates.

2. The linear drive mechanism as described in claim 1, characterized in that, The first cover includes a first cover portion and a second cover portion. The first cover portion is detachably fixed to a first end of the housing. The first cover portion has a countersunk hole that penetrates the first cover portion along the axial direction. The countersunk hole includes a first hole segment and a second hole segment connected to one end of the first hole segment near the housing. The second cover portion is received within the first hole segment and fixed to the first cover portion. The second cover portion has a first clearance hole that penetrates the second cover portion along the axial direction. The guide sleeve is received within the first hole segment and fixed between the first cover portion and the second cover portion. The guide sleeve has a guide hole that penetrates the guide sleeve along the axial direction. The output component is sequentially inserted through the second hole segment, the guide hole, and the first clearance hole. The output component has a gap with the hole wall of the second hole segment and the hole wall of the first clearance hole, and slides in cooperation with the guide hole.

3. The linear drive mechanism as described in claim 2, characterized in that, The first cover portion has a first limiting groove recessed into the hole wall from the hole wall of the first hole segment at one end away from the housing; The guide sleeve includes a guide sleeve body with a guide hole and a first limiting protrusion protruding from the circumference of the guide sleeve body. The guide sleeve body is inserted into the first hole section, and the first limiting protrusion is inserted into the first limiting groove.

4. The linear drive mechanism as described in claim 2, characterized in that, The guide hole wall includes two first planes that are symmetrically arranged about the axis and parallel to the axis, and two first arc surfaces that are respectively connected between the two first planes and located on the same cylindrical surface; The output component includes a cylindrical outer surface and two second planes formed on the outer surface of the output component. The two second planes are symmetrically arranged about the axial direction and parallel to the axial direction. The second planes are arranged in a one-to-one correspondence with the first planes, and the second planes slide in contact with the corresponding first planes. The outer surface of the output component slides in contact with the two first arc surfaces.

5. The linear drive mechanism as described in claim 4, characterized in that, The second plane extends from the second end of the output member to the first end near the output member. The output member also includes a first limiting surface, which connects the end of the second plane near the first end of the output member and the outer surface of the output member. The first limiting surface is used to abut against the side surface of the guide sleeve facing the housing when the output member extends to its limit position along the axial direction, so as to limit the maximum extension stroke of the output member.

6. The linear drive mechanism as described in claim 1, characterized in that, The rotor includes a rotating shaft and a rotor magnet. The rotating shaft includes a first rod portion and a second rod portion connected as one piece and coaxially arranged. The first rod portion is a lead screw, and the rotor magnet is sleeved on the second rod portion. The first bearing is disposed at the end of the second rod portion close to the first rod portion, and the second bearing is disposed at the end of the second rod portion away from the first rod portion; The output component has a transmission hole and a receiving hole that are integrally connected along the axial direction. The transmission hole is located at the first end of the output component and is connected to the first rod in a transmission manner. The receiving hole extends from the transmission hole to the second end near the output component and is used to receive the first rod.

7. The linear drive mechanism as described in claim 6, characterized in that, The rotor also includes a rotor core fixed between the second rod and the rotor magnet. The linear drive mechanism also includes a first locking member and a second locking member. The first locking member is threadedly connected to the housing and has a gap with the rotor core in the axial direction. The first bearing abuts between the rotor core and the first locking member. The second locking member is threadedly connected to the end of the second rod away from the first rod and has a gap with the rotor core in the axial direction. The second bearing abuts between the rotor core and the second locking member.

8. The linear drive mechanism as described in claim 7, characterized in that, The inner surface of the housing includes a cylindrical first surface that is arranged around the axial direction and close to the second rod and connected to one end of the first rod, and an annular planar second surface that is connected to the first surface away from the first rod and arranged around the axial direction. The outer surface of the first bearing is fixed to the first surface. The end face of the first bearing along the axial direction close to the rotor core abuts against the second surface and the rotor core. The other end face of the first bearing along the axial direction abuts against the first locking member.

9. The linear drive mechanism as described in claim 8, characterized in that, The linear drive mechanism further includes a second cover disposed at the second end of the housing in the axial direction. The second cover is inserted into the housing and has a gap with the stator. The second cover includes a cover body and a limiting ring. The cover body includes an inner surface and an outer surface that surround the axial direction and are disposed opposite to each other. The outer surface of the cover body is fixed to the inner surface of the housing. The limiting ring protrudes from the inner surface of the cover body and is located at one end of the cover body near the stator. The outer surface of the second bearing is fixed to the inner surface of the main body of the cover. One end face of the second bearing along the axial direction, close to the rotor core, abuts against the limiting ring and the rotor core. The other end face of the second bearing along the axial direction abuts against the second locking member.

10. The linear drive mechanism as described in claim 9, characterized in that, The main body of the cover includes a first ring portion, a second ring portion spaced around the first ring portion, and a connecting portion connecting the first ring portion and the second ring portion. A limiting ring portion protrudes from the first ring portion, and the connecting portion is connected to the end of the first ring portion away from the limiting ring portion. The first ring portion, the second ring portion, and the connecting portion form a receiving groove. The inner surface of the housing includes a cylindrical third surface spaced from the first surface away from the first rod portion and arranged around the axial direction, and an end connected to the third surface near the first surface. A fourth annular planar surface is arranged around the axial direction, and the third surface is spaced apart from the second surface; the stator includes a hollow cylindrical stator core and a stator coil, the stator core is fixed to the third surface, and one end of the stator core abuts against the fourth surface, while the other end of the stator core has a gap with the second annular portion; the stator coil is fixed to the inner surface of the stator core, one end of the stator coil abuts against the fourth surface, and the other end of the stator coil is inserted into the receiving groove and has a gap with the second cover; and / or, The linear drive mechanism further includes a third cover, a drive circuit board, an encoder, and a position magnet. The third cover is disposed on the outer side of the second end of the housing in the axial direction and is fixed to the second cover. The drive circuit board is fixed to the second cover. The encoder is fixed to the drive circuit board. The position magnet is fixed to the second locking member and is correspondingly disposed to the encoder.

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