Modular actuator for an electric push rod

Abstract

This invention discloses a modular actuator for an electric linear actuator, relating to the field of electric linear actuator technology. It includes a drive motor, a gearbox, and a push-pull rod. The push-pull rod comprises an outer tube, a fixed plate, and a telescopic rod, with a lead screw inside the telescopic rod. One end of the lead screw is detachably inserted into the gearbox, and the other end passes through the fixed plate. A spline nut, a thrust ball bearing, and a lower guide sleeve are sequentially fitted onto the end of the lead screw inside the outer tube. Both the spline nut and the lower guide sleeve are fitted and locked to the lead screw, with the thrust ball bearing positioned between them. A bearing seat detachably connected to the fixed plate is fitted around the thrust ball bearing. The spline nut, thrust ball bearing, and bearing seat form a first bearing pair; the lower guide sleeve, thrust ball bearing, and fixed plate form a second bearing pair. This invention simplifies the bearing support structure, reduces the axial dimension, and makes the structure compact by allowing a single thrust ball bearing to simultaneously bear the bidirectional axial load, while ensuring smooth and reliable bidirectional transmission.

Description

Technical Field

[0001] This invention relates to the field of electric linear actuator technology, and more specifically, to a modular actuator for an electric linear actuator. Background Technology

[0002] An electric linear actuator is an electrically driven device that converts the rotary motion of an electric motor into the linear reciprocating motion of a linear actuator. It is widely used in various industrial automation equipment, medical devices, and home appliances. With the diversification of application scenarios, the market is placing higher demands on the modular design, ease of installation, and transmission efficiency of electric linear actuators.

[0003] In existing technology, electric linear actuators typically include a drive motor, a reduction gearbox, and a push-pull rod assembly. The push-pull rod assembly generally consists of an outer tube, a fixed mounting plate, a telescopic rod, and a lead screw and nut mechanism that drives the telescopic rod. One end of the lead screw is connected to the output end of the gearbox, and the other end is supported on the fixed plate via a bearing, enabling rotational motion and driving the telescopic rod to perform linear motion.

[0004] In practical applications, electric linear actuators need to withstand both thrust and tension simultaneously during operation. Existing designs typically employ the following two bearing support schemes: Firstly, two independent thrust bearings are installed at the fixed plate to bear the axial thrust when the push rod extends and the axial tension when it retracts, respectively. Although the force distribution is clear, this structure has a large number of parts, complex assembly, and a long axial dimension, which is not conducive to the miniaturization design of the push rod.

[0005] Secondly, although some designs attempt to use a single bearing to accommodate bidirectional loads, traditional solutions often use elastic retaining rings or simple shaft shoulders for axial restraint, lacking independent support pairs that provide rigid support and fine-tuning of fit clearance for bidirectional alternating loads of extension and contraction. Under frequent reversing or heavy-load conditions, the bearing is prone to axial movement and eccentric wear, making it difficult to balance transmission smoothness and long-term operational reliability within a compact space.

[0006] Meanwhile, existing electric linear actuators often employ an integrated design or complex fixed connection between the drive motor, gearbox, and push rod, making disassembly and maintenance inconvenient and hindering the rapid replacement of modules of different specifications. This fails to meet the demands of modern industry for modular and standardized equipment.

[0007] Therefore, how to simplify the structure, reduce the axial dimension, improve the ease of assembly, and achieve detachable connection of each functional module while ensuring the bidirectional force performance of the push rod has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] The technical problem to be solved by the present invention is how to simplify the bearing support structure of the electric linear actuator, reduce the axial dimension, and realize the detachable connection of each functional module to improve assembly convenience and maintenance efficiency. In order to overcome the above-mentioned defects of the prior art, the present invention provides a modular actuator for electric linear actuators.

[0009] This invention provides a modular actuator for an electric linear actuator, comprising a drive motor, a gearbox, and a push-pull rod. The drive motor is connected to the push-pull rod via the gearbox. The push-pull rod includes an outer tube, a fixed plate fixedly connected to one end of the outer tube, and a telescopic rod retractably disposed within the outer tube. A lead screw is provided inside the telescopic rod. One end of the lead screw is detachably inserted into the gearbox. The lead screw passes through the fixed plate and extends into the outer tube. The section of the lead screw located inside the outer tube and close to the fixed plate is sequentially fitted with a spline nut, a thrust ball bearing, and a lower guide sleeve. The spline nut and the lower guide sleeve are both sleeved and locked to the lead screw. The thrust ball bearing is placed between the spline nut and the lower guide sleeve. A bearing seat is fitted around the thrust ball bearing, and the bearing seat is detachably connected to the fixed plate. The spline nut, thrust ball bearing, and bearing housing constitute the first bearing pair; the lower guide sleeve, thrust ball bearing, and fixed plate constitute the second bearing pair.

[0010] Compared with existing technologies, the modular actuator of the electric linear actuator disclosed in this application has the following advantages: By placing the thrust ball bearing between the spline nut and the lower guide sleeve, and cooperating with the fixed connection between the bearing housing and the fixed plate, a single thrust ball bearing can simultaneously bear the axial load in both the extension and retraction directions of the telescopic rod, greatly simplifying the bearing support structure, reducing the number of parts, effectively shortening the axial dimension of the push-pull rod, and making the overall structure more compact; at the same time, by forming independent bearing pairs in the two states of extension and retraction, the transmission smoothness and reliability under bidirectional force are ensured, and wear is reduced; the detachable plug-in connection between the lead screw and the gearbox, as well as the detachable connection design between each module, significantly improves the modularity of the product, making assembly, maintenance, and replacement more convenient and efficient.

[0011] In one possible implementation, the fixing plate has an annular connector protruding from the side facing the thrust ball bearing, and the sidewall of the bearing seat is detachably connected to the annular connector.

[0012] Compared with existing technologies, by protruding annular connectors on the fixed plate and detachably connecting the sidewalls of the bearing housing to the annular connectors, the bearing housing can be precisely positioned and stably installed, providing reliable radial and axial support for the thrust ball bearing, ensuring the bearing's alignment at high speeds, reducing uneven wear, and extending its service life.

[0013] In one possible implementation, the sidewall of the bearing housing is threadedly connected to an annular connector.

[0014] Compared with existing technologies, the fixing method of using the bearing housing sidewall and the annular connector threaded connection achieves dual optimization of detachable and stable installation and axial installation accuracy.

[0015] In one possible implementation, a locking washer is provided on the spline nut, and the locking washer is sleeved on the lead screw.

[0016] Compared with existing technologies, spline nuts can precisely limit the position of thrust ball bearings on the lead screw, preventing them from axially moving under alternating loads, thereby ensuring the stability and reliability of thrust transmission.

[0017] In one possible implementation, the gearbox includes a housing and a gear set mounted inside the housing; the gear set includes an input gear, an output gear, and at least one intermediate gear, the input gear being driven by the output shaft of a drive motor, the input gear meshing with the output gear through the intermediate gear, and the output gear being driven by a lead screw.

[0018] Compared with existing technologies, by adopting a multi-stage gear set structure including an input gear, at least one intermediate gear and an output gear, the transmission efficiency and output torque are optimized and balanced. The introduction of the intermediate gear can not only flexibly adjust the reduction ratio according to the actual load requirements, but also convert the high speed of the drive motor into the large torque output required by the push-pull rod, thereby adapting to the thrust requirements under different working conditions.

[0019] In one possible implementation, the output gear has a connecting hole with internal teeth at its center, and one end of the lead screw has a connecting section with external teeth. The connecting section is inserted into the connecting hole and is connected by the external teeth meshing with the internal teeth.

[0020] Compared with existing technologies, the connection hole with internal teeth of the output gear meshes with the connecting section with external teeth at the end of the lead screw, achieving a perfect balance between high torque transmission capability and quick assembly / disassembly. At the same time, this plug-in design eliminates the need for additional fasteners when assembling the lead screw and gearbox. Precise alignment and power coupling can be achieved simply by axial insertion, greatly simplifying the modular assembly process and facilitating quick interchange and maintenance of the push-pull rod with gearboxes of different specifications.

[0021] In one possible implementation, the output shaft of the drive motor is plugged into the input gear of the gearbox.

[0022] Compared with existing technologies, the motor's output shaft engages with the input gear via axial insertion and removal, simplifying the transmission alignment process. Combined with the detachable connection of the second screw, it improves assembly efficiency and ease of later maintenance. At the same time, it provides a structural basis for the actuator to quickly replace different specifications of drive motors according to different working conditions, thereby significantly reducing production and maintenance costs.

[0023] In one possible implementation, a push-pull sleeve is also provided inside the telescopic rod. The push-pull sleeve is fitted onto the lead screw and is rotatably connected to the lead screw. The lead screw passes through the fixed plate and extends into the push-pull sleeve, and is used to drive the push-pull sleeve to extend and retract the telescopic rod.

[0024] Compared with existing technologies, by setting a push-pull sleeve inside the telescopic rod and extending the lead screw into the push-pull sleeve to drive the telescopic rod, the optimized layout of the transmission structure and the motion accuracy are both improved.

[0025] In one possible implementation, the gearbox is detachably connected to the mounting plate by a first screw.

[0026] Compared with existing technologies, connecting with a first screw provides a strong fastening force between the gearbox and the fixed plate, ensuring that the two maintain the accuracy of their relative positions and the rigidity of the connection during operation, and preventing loosening or displacement due to vibration or load changes; moreover, the screw connection facilitates quick assembly and disassembly, greatly improving maintenance efficiency and convenience.

[0027] In one possible implementation, the gearbox is detachably connected to the drive motor via a second screw.

[0028] Compared with existing technologies, the gearbox and drive motor are detachably connected by a second screw, which significantly improves the ease of modular assembly and maintenance. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of a modular actuator for an electric linear actuator according to the present invention; Figure 2 This is an exploded view of the modular connection structure of a modular actuator for an electric linear actuator according to the present invention; Figure 3 This is a schematic diagram of the overall structure of the push-pull rod in a modular actuator of an electric linear actuator according to the present invention; Figure 4 This is a cross-sectional view of the push-pull rod in a modular actuator of an electric linear actuator according to the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle; Figure 6 This is an exploded view of the gearbox structure in a modular actuator for an electric linear actuator according to the present invention. Figure 7 This is a schematic diagram of the output gear structure in the gearbox of a modular actuator for an electric linear actuator according to the present invention; Figure 8 This is a bottom view of the overall structure of the gearbox in a modular actuator for an electric linear actuator according to the present invention.

[0030] Explanation of reference numerals in the attached figures: 1-Drive motor; 2-Gearbox; 21-Box housing; 22-Gear set; 221-Input gear; 222-Intermediate gear; 223-Output gear; 3-Push-pull rod; 31-Outer tube; 32-Fixing plate; 321-Annular connector; 33-Telescopic rod; 34-Push-pull sleeve; 35-Screw rod; 351-Connecting section; 36-Thrust ball bearing; 37-Bearing housing; 38-Spline nut; 381-Stabilizing washer; 39-Lower guide sleeve; 41 - First screw; 42 - Second screw. Detailed Implementation

[0031] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0032] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0033] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0035] See Figures 1 to 8 As shown in the figure, this application discloses a modular actuator for an electric linear actuator, including a drive motor 1, a gearbox 2, and a push-pull rod 3. The drive motor 1 is connected to the push-pull rod 3 through the gearbox 2 to drive the push-pull rod 3 to perform telescopic movement.

[0036] The push-pull rod 3 includes an outer tube 31, a fixing plate 32 fixedly connected to one end of the outer tube 31, and a telescopic rod 33 telescopically disposed inside the outer tube 31; the telescopic rod 33 is provided with a push-pull sleeve 34 and a lead screw 35 for driving the push-pull sleeve 34 to telescopically move.

[0037] The rotational motion of the lead screw 35 is converted into the linear motion of the telescopic rod 33 through the push-pull sleeve 34. The push-pull sleeve 34, acting as an intermediate transmission component, can evenly distribute the axial thrust transmitted by the lead screw 35, making the force on the telescopic rod 33 more stable during extension and retraction, reducing off-center loading and jamming, and improving motion accuracy. The specific working principle of the push-pull rod 3 is similar to the telescopic rod described in the photovoltaic push rod with a single thrust bearing capable of withstanding dual axial forces disclosed in prior art (CN223498428U).

[0038] In this embodiment, one end of the lead screw 35 is detachably inserted into the gearbox 2, and the other end passes through the fixing plate 32. The section of the lead screw 35 located inside the outer tube 31 and close to the fixing plate 32 is sequentially fitted with a spline nut 38, a thrust ball bearing 36, and a lower guide sleeve 39. The spline nut 38 and the lower guide sleeve 39 are both fitted and locked to the lead screw 35. The thrust ball bearing 36 is placed between the spline nut 38 and the lower guide sleeve 39. A bearing seat 37 is fitted over the thrust ball bearing 36, and the bearing seat 37 is detachably connected to the fixing plate 32.

[0039] In this configuration, the spline nut 38 presses against one end of the thrust ball bearing 36, and the other end of the thrust ball bearing 36 presses against the bearing housing 37, ultimately forming the first bearing pair with the spline nut 38, the thrust ball bearing 36, and the bearing housing 37.

[0040] The lower guide sleeve 39 presses against one end of the thrust ball bearing 36, and the other end of the thrust ball bearing 36 presses against the fixed plate 32, so that the lower guide sleeve 39, the thrust ball bearing 36 and the fixed plate 32 form a second bearing pair.

[0041] By placing the thrust ball bearing 36 between the spline nut 38 and the lower guide sleeve 39, and cooperating with the fixed connection between the bearing housing 37 and the fixed plate 32, the single thrust ball bearing 36 can simultaneously bear the axial load in both the extension and retraction directions of the telescopic rod 33. This greatly simplifies the bearing support structure, reduces the number of parts, effectively shortens the axial dimension of the push-pull rod 3, and makes the overall structure more compact. At the same time, by forming independent bearing pairs in the two states of extension and retraction, the transmission smoothness and reliability under bidirectional force are ensured, and wear is reduced.

[0042] Meanwhile, the modularity of the product is significantly improved by the detachable connection between the lead screw 35 and the gearbox 2, as well as the detachable connection between each module, making assembly, maintenance and replacement more convenient and efficient.

[0043] See Figure 4 and Figure 5 As shown, a ring-shaped connector 321 protrudes from the side of the fixed plate 32 facing the thrust ball bearing 36, and the side wall of the bearing seat 37 is detachably connected to the ring-shaped connector 321.

[0044] By protruding annular connector 321 on the fixed plate 32 and detachably connecting the side wall of the bearing housing 37 to the annular connector 321, the bearing housing 37 is accurately positioned and stably installed. This structure not only provides reliable radial and axial support for the thrust ball bearing 36 and ensures the alignment of the bearing under high-speed operation, but also reduces uneven wear and extends service life.

[0045] Meanwhile, the sidewall fixing method avoids the need to open complex bearing mounting grooves on the fixing plate 32, simplifies the processing technology of the fixing plate 32, and reduces manufacturing costs. In addition, the combination structure of the annular connector 321 and the bearing housing 37 forms an independent bearing mounting unit, which facilitates alignment adjustment during assembly and subsequent maintenance and replacement, further improving the modularity and assembly convenience of the product.

[0046] In this embodiment, the sidewall of the bearing housing 37 is threadedly connected to the annular connector 321. This threaded connection between the sidewall of the bearing housing 37 and the annular connector 321 achieves a dual optimization of detachable, stable installation and axial installation accuracy. The threaded connection not only facilitates assembly and disassembly, significantly improving maintenance efficiency and allowing for easy replacement of the bearing housing 37 even after long-term use, but also allows for fine-tuning of the axial position of the bearing housing 37 by adjusting the thread engagement depth, ensuring that the clearance between the thrust ball bearing 36, the spline nut 38, and the lower guide sleeve 39 meets the preset clearance requirements, thereby improving transmission smoothness. Furthermore, this sidewall threaded connection avoids the use of additional fasteners, simplifies the structure, reduces production costs, and enhances the connection reliability of the bearing housing 37 when subjected to reciprocating axial impact loads.

[0047] See Figure 5 As shown, a retaining washer 381 is provided on the spline nut 38, and the retaining washer 381 is sleeved on the lead screw 35.

[0048] A locking washer 381, fitted onto the spline nut 38 and then onto the lead screw 35, significantly improves the reliability of the connection between the spline nut 38 and the lead screw 35. The locking washer 381's anti-loosening function effectively prevents the spline nut 38 from loosening or falling off due to vibration and impact loads during long-term forward and reverse operation of the lead screw 35, ensuring that the spline nut 38 always maintains a precise fit with the thrust ball bearing 36, thereby maintaining the stable stress state of the first bearing pair. Simultaneously, the locking washer 381 also disperses the torque stress transmitted from the spline nut 38 to the lead screw 35, protecting the threaded connection from fatigue damage and extending its service life. This fixing method simplifies the assembly process of the anti-loosening structure, eliminating the need for additional locking parts, facilitating modular assembly and maintenance, and further enhancing the overall transmission safety and reliability.

[0049] In this embodiment, the lower guide sleeve 39 is sleeved and locked to the lead screw 35, and the two are fixedly connected. To further improve its axial fixing effect, a limiting block is also sleeved on the lead screw 35. The limiting block is located on the side of the lower guide sleeve 39 near the push-pull sleeve 34, and is used to restrict the movement of the lower guide sleeve 39 to improve the fixing effect. A step is formed on the lead screw 35, and the step is located on the side of the limiting block near the push-pull sleeve 34, and is used to support and restrict the movement of the limiting block.

[0050] Specifically, the lower end face of the limiting block axially abuts against the upper end face of the step of the lead screw 35, so as to form a one-way axial limit on the limiting block through the step. The limiting block and the lower guide sleeve 39 are axially abutted, and the inner diameter of the limiting block and the outer diameter of the lead screw 35 are clearance fit.

[0051] See Figures 6-8 As shown, the gearbox 2 includes a housing 21 and a gear set 22 installed inside the housing 21. The gear set 22 includes an input gear 221, an output gear 223, and at least one intermediate gear 222. The input gear 221 is connected to the output shaft of the drive motor 1, and the input gear 221 meshes with the output gear 223 through the intermediate gear 222. The output gear 223 is connected to the lead screw 35.

[0052] By employing a multi-stage gear set 22 structure comprising an input gear 221, at least one intermediate gear 222, and an output gear 223, an optimized balance between transmission efficiency and output torque is achieved. The introduction of the intermediate gear 222 not only allows for flexible adjustment of the reduction ratio according to actual load requirements, converting the high speed of the drive motor 1 into the large torque output required by the push-pull rod 3, thus adapting to the thrust requirements under different working conditions; at the same time, the multi-stage gear transmission effectively disperses the meshing stress of single-stage gears, reducing gear wear and breakage risks, and extending the service life of the gearbox 2.

[0053] The modular design of the gear set 22 facilitates quick matching and replacement according to different motor specifications and performance requirements without altering the overall structure, further enhancing the standardization and versatility of the actuator and providing convenience for the serialization development of products.

[0054] In this embodiment, the output gear 223 has a connecting hole with internal teeth at its center, and the lead screw 35 has a connecting section 351 with external teeth at one end. The connecting section 351 is inserted into the connecting hole and is connected by meshing with the internal teeth through the external teeth.

[0055] The output gear 223, with its internally toothed connecting hole, meshes with the externally toothed connecting section 351 at the end of the lead screw 35, achieving a harmonious balance between high torque transmission capability and convenient quick assembly and disassembly. Compared to traditional keyed connections or tight fits, the internal and external tooth meshing structure has a larger torque transmission contact area, effectively dispersing stress concentration and preventing slippage or torsional deformation of the lead screw 35 under frequent start-stop or heavy-load conditions, significantly improving transmission reliability. Simultaneously, this plug-in design eliminates the need for additional fasteners when assembling the lead screw 35 and gearbox 2; precise alignment and power coupling can be achieved simply through axial insertion, greatly simplifying the modular assembly process and facilitating rapid interchange and maintenance of the push-pull rod 3 with gearboxes 2 of different specifications.

[0056] The combination of internal and external gears can automatically compensate for minor coaxiality deviations, reducing the demanding requirements for machining accuracy and thus optimizing production costs.

[0057] See Figure 6 As shown, the output shaft of the drive motor 1 is plugged into the input gear 221 of the gearbox 2. This direct plug-in meshing structure achieves both tool-free quick assembly and disassembly of the power module and optimization of transmission efficiency. By eliminating traditional couplings or fasteners, the motor can be quickly separated from or installed from the gearbox 2 without disassembling any fasteners, greatly improving production assembly efficiency and the convenience of on-site maintenance.

[0058] Meanwhile, the plug-in meshing ensures the coaxiality between the output shaft and the input gear 221, reducing vibration and energy loss caused by assembly eccentricity, making power transmission smoother and more efficient. In addition, this standardized interface design provides flexibility for the modular selection of the drive motor 1, allowing for quick replacement of motors of different specifications according to different load requirements without modifying the structure of the gearbox 2, further enhancing the versatility and adaptability of the actuator.

[0059] See Figure 2 As shown, the gearbox 2 is detachably connected to the push-pull rod 3 by the first screw 41. Specifically, the gearbox 2 is detachably connected to the fixing plate 32 by the first screw 41; the gearbox 2 is detachably connected to the drive motor 1 by the second screw 42.

[0060] The modular connection is secured by using a first screw 41 and a second screw 42. This screw connection method ensures the stability of the connection between the push-pull rod 3 and the gearbox 2, as well as between the drive motor 1 and the gearbox 2, during operation. It effectively resists vibration and torque impact generated during operation, preventing the connection from loosening. Furthermore, when it is necessary to replace the motor or push-pull rod 3 with a different specification, or when fault repair is required, the two modules can be quickly separated simply by removing the first screw 41 and the second screw 42, without using specialized tools or damaging other structures, significantly reducing maintenance difficulty and time costs.

[0061] Furthermore, this standardized interface design allows the same gearbox 2 to be adapted to motors of various power levels and push-pull rods 3, enhancing the product's versatility and serial expansion capabilities, and providing strong support for improving the efficiency of manufacturing and after-sales service.

[0062] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer", etc., which indicate the direction or positional relationship, are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0063] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0064] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A modular actuator for an electric linear actuator, comprising a drive motor (1), a gearbox (2), and a push-pull rod (3), wherein the drive motor (1) is connected to the push-pull rod (3) via the gearbox (2); the push-pull rod (3) comprises an outer tube (31), a fixing plate (32) fixedly connected to one end of the outer tube (31), and a telescopic rod (33) telescopically disposed within the outer tube (31); wherein a lead screw (35) is provided within the telescopic rod (33); characterized in that, One end of the lead screw (35) is detachably inserted into the gearbox (2). The lead screw (35) passes through the fixed plate (32) and extends into the outer tube (31). The section of the lead screw (35) located inside the outer tube (31) and close to the fixed plate (32) is sequentially fitted with a spline nut (38), a thrust ball bearing (36), and a lower guide sleeve (39). The spline nut (38) and the lower guide sleeve (39) are both fitted and locked with the lead screw (35). The thrust ball bearing (36) is placed between the spline nut (38) and the lower guide sleeve (39). A bearing seat (37) is fitted around the thrust ball bearing (36). The bearing seat (37) is detachably connected to the fixed plate (32). The spline nut (38), thrust ball bearing (36) and bearing housing (37) constitute the first bearing pair; the lower guide sleeve (39), thrust ball bearing (36) and fixing plate (32) constitute the second bearing pair.

2. The modular actuator for an electric linear actuator according to claim 1, characterized in that, The fixed plate (32) has an annular connector (321) protruding on the side facing the thrust ball bearing (36), and the side wall of the bearing seat (37) is detachably connected to the annular connector (321).

3. The modular actuator for an electric linear actuator according to claim 2, characterized in that, The sidewall of the bearing housing (37) is threadedly connected to the annular connector (321).

4. The modular actuator for an electric linear actuator according to claim 1, characterized in that, A stop washer (381) is provided on the spline nut (38), and the stop washer (381) is sleeved on the lead screw (35).

5. A modular actuator for an electric linear actuator according to claim 1, characterized in that, The gearbox (2) includes a housing (21) and a gear set (22) installed inside the housing (21); The gear set (22) includes an input gear (221), an output gear (223), and at least one intermediate gear (222). The input gear (221) is connected to the output shaft of the drive motor (1). The input gear (221) meshes with the output gear (223) through the intermediate gear (222). The output gear (223) is connected to the lead screw (35).

6. A modular actuator for an electric linear actuator according to claim 5, characterized in that, The output gear (223) has a connecting hole with internal teeth at its center, and the lead screw (35) has a connecting section (351) with external teeth at one end. The connecting section (351) is inserted into the connecting hole and is connected by meshing with the internal teeth through the external teeth.

7. A modular actuator for an electric linear actuator according to claim 5, characterized in that, The output shaft of the drive motor (1) is engaged with the input gear (221) of the gearbox (2) in a plug-in manner.

8. A modular actuator for an electric linear actuator according to claim 1, characterized in that, The telescopic rod (33) is also provided with a push-pull sleeve (34), which is sleeved on the lead screw (35) and rotatably connected to the lead screw (35); the lead screw (35) passes through the fixed plate (32) and extends into the push-pull sleeve (34) to drive the push-pull sleeve (34) to drive the telescopic rod (33) to extend and retract.

9. A modular actuator for an electric linear actuator according to claim 1, characterized in that, The gearbox (2) is detachably connected to the fixing plate (32) by a first screw (41).

10. A modular actuator for an electric linear actuator according to claim 1, characterized in that, The gearbox (2) is detachably connected to the drive motor (1) by a second screw (42).

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