A linear actuator

Abstract

This invention discloses a linear actuator comprising: a fixed base, a drive assembly, and a push rod assembly. The fixed base has a fixed track extending in the same direction as the fixed base and passing through it. The drive assembly includes a drive member with an output portion rotatable about a first axis parallel to the extension direction of the fixed base. The push rod assembly includes a stroke push rod and a connecting member connecting the stroke push rod and the output portion. A portion of the connecting member engages with the fixed track. Rotation of the output portion causes a portion of the connecting member to rotate and move along the extension direction of the fixed track, thereby moving the stroke push rod and the drive assembly along the extension direction of the fixed base. This linear actuator has the advantages of simple structure, high motion accuracy, and high stability.

Description

Technical Field

[0001] This utility model relates to the field of actuator technology, specifically to a linear actuator. Background Technology

[0002] As a core driving component of mechatronic systems, linear actuators convert electrical energy into precise linear motion and are widely used in fields such as industrial automation, medical equipment, robotics, and new energy vehicles.

[0003] In related technologies, linear actuators often adopt a split structure, requiring independent assembly of the motor, lead screw, encoder, and brake, with the number of components exceeding 50. This design leads to increased cumulative assembly errors, decreased transmission chain rigidity, and a tendency to cause positioning drift under dynamic loads. Utility Model Content

[0004] This utility model aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of this utility model propose a linear actuator, which has the advantages of simple structure, high motion accuracy and stability.

[0006] The linear actuator according to an embodiment of the present invention includes:

[0007] A fixed base having a fixed track, the fixed track extending in the same direction as the fixed base, and the fixed track passing through the fixed base along the extending direction of the fixed base;

[0008] A drive assembly, the drive assembly including a drive member having an output portion rotatable about a first axis parallel to the extension direction of the fixed base;

[0009] A push rod assembly includes a stroke push rod and a connector. The connector connects the stroke push rod and the output part, and a portion of the connector is engaged with the fixed track. The output part rotates, causing a portion of the connector to rotate and move along the extension direction of the fixed track, so that the stroke push rod and the drive assembly move along the extension direction of the fixed base.

[0010] The linear actuator of this embodiment, through the connection of the output part of the drive component, the connecting part, and the stroke push rod, can efficiently and accurately convert the rotational motion of the drive component into the linear motion of the stroke push rod. Due to the guiding effect of the fixed track on the movement of the connecting part, the stroke push rod and the drive component can make stable linear motion along the extension direction of the fixed base, ensuring the accuracy of the output motion of the linear actuator.

[0011] Furthermore, under dynamic loads, thanks to its low cumulative assembly error and high transmission chain rigidity, this linear actuator effectively reduces positioning drift. The precise structural connections ensure a more stable response to load changes during operation, maintaining accurate positioning under various working conditions and improving the overall performance and reliability of the structure.

[0012] In some embodiments, the fixed base has a through hole in its extending direction, the wall of the through hole has an internal thread, the internal thread forms the fixed track, the connector includes a connecting base and a connecting bearing, the outer peripheral wall of the connecting base has an external thread that matches the fixed track, the connecting base is fixedly connected to the output part, the connecting bearing connects the stroke push rod and the connecting base and is located on the side of the connecting base away from the drive assembly, and the axial direction of the connecting bearing is collinear with the first axial direction.

[0013] In some embodiments, the connecting base includes a connecting hole, at least a portion of the output portion is disposed within the connecting hole, and the radial dimension of the connecting base is greater than the radial dimension of the drive assembly.

[0014] In some embodiments, the connecting base has a groove on the side adjacent to the stroke push rod, at least a portion of the connecting bearing is placed in the groove, and the outer ring of the connecting bearing is fixedly connected to the side wall of the groove, and the inner ring of the connecting bearing is fixedly connected to one end of the stroke push rod.

[0015] In some embodiments, the connecting base further has an extension located at the bottom of the groove and extending toward the travel push rod, a portion of the extension being placed in the inner ring of the connecting bearing and rotatable relative to the inner ring of the connecting bearing, and the connecting hole penetrating the extension.

[0016] In some embodiments, in the extending direction of the fixed base, the length of the extension is less than the size of the connecting bearing.

[0017] In some embodiments, the sidewall of the through hole is provided with a concave arc groove, and the extending direction of the concave arc groove is consistent with the extending direction of the fixing seat.

[0018] In some embodiments, there are multiple concave arc grooves, which are arranged circumferentially at intervals along the axis of the through hole.

[0019] In some embodiments, the driving element includes a drive motor and a reducer connected in sequence, and the output shaft of the reducer forms an output section.

[0020] In some embodiments, the drive unit further includes an encoder connected to the drive motor. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the linear actuator according to an embodiment of the present invention.

[0022] Figure 2 This is a cross-sectional structural schematic diagram of the linear actuator according to an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the three-dimensional structure of the linear actuator (hidden fixing base) according to an embodiment of the present utility model.

[0024] Figure 4 This is a first-view schematic diagram of the linear actuator connection base according to an embodiment of the present invention.

[0025] Figure 5 This is a second-view schematic diagram of the linear actuator connecting base according to an embodiment of the present invention.

[0026] Figure 6 This is a three-dimensional structural diagram of the linear actuator mounting base according to an embodiment of the present invention.

[0027] Figure 7 This is an exploded view of the three-dimensional structure (hidden fixed base) of the linear actuator according to an embodiment of this utility model.

[0028] Figure label:

[0029] 1. Fixed base; 11. Fixed track; 12. Recessed arc groove.

[0030] 2. Drive assembly; 21. Drive component; 210. Output unit; 211. Drive motor; 212. Reducer; 213. Encoder.

[0031] 3. Push rod assembly, 31. Stroke push rod, 32. Connector, 321. Connecting base, 3211. Connecting hole, 3212. Groove, 3213. Extension, 322. Connecting bearing. Detailed Implementation

[0032] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0033] like Figures 1-7 As shown, the linear actuator of this utility model embodiment includes: a fixed base 1, a drive assembly 2, and a push rod assembly 3.

[0034] The mounting base 1 has a fixed track 11, and the extension direction of the fixed track 11 is (e.g.) Figure 1The left-right direction of the fixed rail 11 is consistent with the extension direction of the fixed base 1, and the fixed rail 11 passes through the fixed base 1 along the extension direction of the fixed base 1. The drive assembly 2 includes a drive member 21, which has an output part 210. The output part 210 is rotatable about a first axis, which is parallel to the extension direction of the fixed base 1. The push rod assembly 3 includes a stroke push rod 31 and a connecting member 32. The connecting member 32 connects the stroke push rod 31 and the output part 210, and a portion of the connecting member 32 is engaged with the fixed rail 11. The rotation of the output part 210 drives a portion of the connecting member 32 to rotate and move along the extension direction of the fixed rail 11, so that the stroke push rod 31 and the drive assembly 2 move along the extension direction of the fixed base 1.

[0035] Specifically, such as Figures 1-3 and Figure 7 As shown, the bottom of the fixing base 1 has a threaded hole, so that the fixing base 1 can be installed on other equipment by bolts or the like. The fixing rail 11 passes through the fixing base 1 in the left and right direction, and the connecting piece 32 can be connected with the fixing rail 11 so that the connecting piece 32 can move or rotate relative to the fixing rail 11.

[0036] It is understood that the drive component 21 of the drive assembly 2 is connected to the stroke push rod 31 in the push rod assembly 3 via the connector 32. The connector 32 acts as a bridge, converting the rotation of the output part 210 of the drive component 21 into a specific form of motion to drive the stroke push rod 31. Specifically, when the output part 210 rotates, it drives part of the connector 32 to rotate. The connector 32 rotates and moves along the extension direction of the fixed track 11 on the fixed base 1, thereby enabling the stroke push rod 31 to move accordingly.

[0037] The connector 32 and the stroke push rod 31 in the push rod assembly 3 move with the rotation of the output part 210 of the drive member 21, and the trajectory of the movement is constrained by the fixed track 11 on the fixed base 1. The connector 32 moves along the extension direction in the fixed track 11, thereby ensuring that the stroke push rod 31 in the push rod assembly 3 can move along the extension direction of the fixed base 1, thereby realizing the conversion of the rotational motion of the drive member 21 into the linear motion of the stroke push rod 31.

[0038] It should be noted that the combination of the driving component 21, the connecting component 32 and the fixed track 11 can be a mechanism that can change the rotational motion into a linear motion, such as a screw and nut mechanism driven by a motor.

[0039] In other words, the linear actuator of this embodiment of the invention, through the connection of the output part 210 of the drive member 21, the connecting member 32, and the stroke push rod 31, can efficiently and accurately convert the rotational motion of the drive member 21 into the linear motion of the stroke push rod 31. Due to the guiding effect of the fixed track 11 on the movement of the connecting member 32, the stroke push rod 31 and the drive member 21 can make stable linear motion along the extension direction of the fixed base 1, ensuring the accuracy of the output motion of the linear actuator.

[0040] Furthermore, under dynamic loads, thanks to its low cumulative assembly error and high transmission chain rigidity, this linear actuator effectively reduces positioning drift. The precise structural connections ensure a more stable response to load changes during operation, maintaining accurate positioning under various working conditions and improving the overall performance and reliability of the structure.

[0041] In some embodiments, the fixed base 1 has a through hole in its extending direction, and the wall of the through hole has an internal thread. The internal thread forms a fixed track 11. The connector 32 includes a connecting base 321 and a connecting bearing 322. The outer peripheral wall of the connecting base 321 has an external thread that matches the fixed track 11. The connecting base 321 is fixedly connected to the output part 210. The connecting bearing 322 connects the stroke push rod 31 and the connecting base 321 and is located on the side of the connecting base 321 away from the drive assembly 2. The axial direction of the connecting bearing 322 is collinear with the first axial direction.

[0042] Specifically, such as Figure 2 and Figure 6 As shown, the outer peripheral wall of the connector 32 can fit on the fixed track 11, so that when the output part 210 rotates, it can drive the connecting base 321 to rotate. The connecting base 321 rotates and moves linearly along the extension direction of the fixed seat 1, so that the outer ring of the connecting bearing 322 rotates relative to the connecting base 321, while the inner ring of the connecting bearing 322 is connected to the stroke push rod 31, realizing the conversion of the motion form of the connecting base 321 and the connection constraint between it and the fixed track 11, and also driving the stroke push rod 31 to move linearly.

[0043] It is understood that the output part 210 and the connecting base 321 can be connected by thread or welding. When using a threaded connection, it is necessary to ensure that the rotation direction of the output part 210 is consistent with the tightening direction of the thread. The outer ring of the connecting bearing 322 is welded to the connecting base 321, and the inner ring of the connecting bearing 322 is welded to the stroke push rod 31.

[0044] Thus, the connecting base 321 and the fixed rail 11, through the engagement of threaded pairs (internal and external threads), precisely convert the rotational motion of the drive component 21 into linear motion. Threaded transmission offers high transmission accuracy, enabling the linear motion of the stroke push rod 31 to achieve excellent precision, meeting the high-precision linear motion requirements of fields such as industrial automation and medical equipment. The axial direction of the connecting bearing 322 is collinear with the first axial direction, ensuring the axial stability of the stroke push rod 31 during linear motion, reducing offset and errors during movement, and further improving the motion accuracy of the linear actuator.

[0045] In addition, by using the internal thread on the fixed base 1 as the fixed rail 11, which mates with the external thread of the connecting base 321, additional guide rails and other components are reduced, making the structure of the entire linear actuator more compact, reducing the number of components, and saving space.

[0046] In some embodiments, the connecting base 321 includes a connecting hole 3211, at least a portion of the output portion 210 is disposed within the connecting hole 3211, and the radial dimension of the connecting base 321 is greater than the radial dimension of the drive assembly 2.

[0047] Specifically, such as Figures 1-5 As shown, at least a portion of the output section 210 of the drive assembly 2 is placed within the connection hole 3211, making it easier for the output section 210 to connect with the connection base 321 and reducing the overall space occupied by the drive component 21. When the drive component 21 drives the output section 210 to rotate around the first axis, since the output section 210 is located within the connection hole 3211, it can effectively drive the connection base 321 to rotate synchronously.

[0048] Understandably, the radial dimension of the connecting base 321 is larger than that of the drive assembly 2, preventing the drive assembly 2 from contacting the side wall of the fixed base 1 when rotating with the connecting base 321, thus improving the safety of the device. Furthermore, the larger radial dimension of the connecting base 321 creates a more robust support structure at the connection point. When the linear actuator is subjected to lateral forces or vibrations, the larger connecting base 321 provides better anti-interference capabilities, helps stabilize the entire actuator structure, reduces component swaying or misalignment caused by external forces, and ensures stable operation of the actuator under various working conditions.

[0049] In some embodiments, the connecting base 321 has a groove 3212 on the side adjacent to the stroke push rod 31, at least a portion of the connecting bearing 322 is placed in the groove 3212, and the outer ring of the connecting bearing 322 is fixedly connected to the side wall of the groove 3212, and the inner ring of the connecting bearing 322 is fixedly connected to one end of the stroke push rod 31.

[0050] Specifically, such as Figures 1-5As shown, the groove 3212 is located on the left side of the connecting base 321. The design of the groove 3212 allows the connecting bearing 322 to be embedded in the connecting base 321. This embedded design effectively reduces the space occupied by the linear actuator in the axial direction, making the whole device more compact.

[0051] Understandably, installing the connecting bearing 322 within the groove 3212 of the connecting base 321 provides a clear positioning for the installation process and allows for convenient assembly using specific tools. Simultaneously, fixing the stroke push rod 31 to the inner ring of the connecting bearing 322 is relatively simple, reducing the difficulty and complexity of installation and improving assembly efficiency.

[0052] In some embodiments, the connecting base 321 further has an extension 3213, which is located at the bottom of the groove 3212 and extends toward the direction of the stroke push rod 31. A portion of the extension 3213 is placed in the inner ring of the connecting bearing 322, and the extension 3213 is rotatable relative to the inner ring of the connecting bearing 322. The connecting hole 3211 passes through the extension 3213.

[0053] Specifically, such as Figures 1-7 As shown, one end of the extension 3213 is connected to the bottom of the groove 3212, making the groove 3212 an annular groove. The extension 3213 is placed in the inner ring of the connecting bearing 322, ensuring good coaxiality between the connecting base 321 and the stroke push rod 31. That is, the connecting bearing 322 itself plays a positioning and guiding role, and the cooperation between the extension 3213 and the inner ring makes the two coaxial, reducing the shaking and deviation caused by misalignment during movement and improving the motion stability of the linear actuator.

[0054] Understandably, the extension 3213 provides additional support between the connecting base 321 and the connecting bearing 322, enabling better force distribution. When the linear actuator is operating, the connecting parts may bear significant forces; the extension 3213 can evenly distribute these forces to each component, thereby reducing the risk of localized stress concentration and enhancing the overall reliability of the structure.

[0055] Furthermore, the extension 3213 is rotatable relative to the inner ring of the connecting bearing 322. This structure allows the connecting base 321 to transmit power more smoothly to the stroke push rod 31 during rotation. During the rotation of the connecting base 321 driven by the drive assembly 2, the relative rotation between the extension 3213 and the inner ring effectively buffers and adjusts the motion, reducing jerking during movement and making the linear motion of the stroke push rod 31 smoother. Due to the more stable structure and smoother motion, the linear actuator can achieve more precise motion control. In applications requiring high-precision positioning and motion, such as precision machining equipment and robots, this design can control errors within a very small range, improving the working accuracy and efficiency of the equipment.

[0056] In some embodiments, the length of the extension 3213 in the extending direction of the fixed base 1 is less than the size of the connecting bearing 322.

[0057] Understandably, the length of the extension 3213 is less than the size of the connecting bearing 322, so that when the extension 3213 mates with the inner ring of the connecting bearing 322, there is room for the installation of the stroke push rod 31. Furthermore, the shorter length of the extension 3213 compared to the connecting bearing 322 allows for more internal space within the connecting bearing 322 for heat exchange and the distribution of the lubricating medium. During operation, the rotation of the connecting bearing 322 generates heat. If the space is too small to facilitate heat dissipation, it may cause the bearing temperature to rise, affecting its performance and lifespan. Appropriate space allows for airflow to carry away heat, achieving better heat dissipation. Simultaneously, for applications using grease or oil lubrication, a larger space allows for better coverage and circulation of the lubricating medium, ensuring good lubrication of the connecting parts, reducing component wear, and extending service life.

[0058] In practical applications, linear actuators may be subjected to various external forces and vibrations, causing components to deform or shift to some extent. The shorter extension 3213 provides the connecting bearing 322 with more tolerance in such situations, enabling it to self-adjust and adapt within a certain range. This reduces the risk of jamming or damage caused by minor deformation or displacement of components, thereby enhancing the overall reliability and stability of the linear actuator.

[0059] In some embodiments, the sidewall of the through hole is provided with a concave arc groove 12, the extending direction of which is consistent with the extending direction of the fixing seat. It is understood that the concave arc groove 12 provides precise guidance for the linear movement of the connector 32 (such as the connecting base 321). Guided by the concave arc groove 12, the connector 32 is more stable during movement. When subjected to external force interference or vibration, the concave arc groove 12 can act as a constraint, preventing the connector 32 from wobbling or deviating from its trajectory.

[0060] Furthermore, the concave groove 12 can serve as a storage and flow channel for the lubricating medium to some extent. During operation, lubricating grease can accumulate in the concave groove 12, and with the movement of the connecting member 32, the lubricating grease can be better distributed to various friction surfaces, reducing friction and improving transmission efficiency. The concave groove 12 also increases the contact area with air, which helps dissipate heat. Linear actuators generate heat during operation, and if heat dissipation is not timely, it may affect their performance and reliability. The concave groove 12 plays a certain role in heat dissipation, helping to maintain the linear actuator at a suitable temperature.

[0061] Preferably, there are multiple concave arc grooves 12, and the multiple concave arc grooves 12 are arranged circumferentially at intervals along the axis of the through hole.

[0062] In some embodiments, the drive unit 21 includes a drive motor 211 and a reducer 212 connected in sequence, with the output shaft of the reducer 212 forming an output section 210. It is understood that the drive motor 211, as the power source of the entire drive assembly 2, converts electrical energy into rotational mechanical energy. The reducer 212 is connected after the drive motor 211, and its main function is to reduce the high speed output by the drive motor 211 and increase the torque. The output shaft of the reducer 212 is the aforementioned output section 210, which is connected to the connecting base 321 in the connector 32 (e.g., the connecting hole 3211 of the connecting base 321 is assembled with the output shaft), thereby transmitting the reduced and amplified power to the connector 32, which in turn drives the stroke push rod 31 to perform linear motion.

[0063] Different working scenarios and loads place different requirements on the speed and torque of linear actuators. The drive motor 211 typically has a high speed, but its torque may be relatively low. Through the speed reduction and torque amplification effect of the reducer 212, the output speed and torque of the linear actuator can be better matched to the specific working load. For example, in some industrial equipment that requires slow movement but large thrust, the reducer 212 can reduce the high speed of the drive motor 211 to a suitable range and increase the output torque, ensuring that the linear actuator can stably drive the load.

[0064] In some embodiments, the drive unit 21 further includes an encoder 213, which is connected to the drive motor 211. It is understood that the control system can accurately calculate the position of the stroke push rod 31 in the linear actuator by using the rotation angle information of the drive motor 211 fed back by the encoder 213. In applications requiring high-precision positioning, such as the tool feed system of CNC machine tools and the arm movement of industrial robots, the encoder 213 can assist the control system in timely adjusting the drive motor 211, ensuring that the stroke push rod 31 accurately reaches the set position, greatly improving the positioning accuracy of the linear actuator. For example, when machining precision parts on a CNC machine tool, the encoder 213 can ensure that the positional error of the tool feed is controlled within a very small range, guaranteeing product quality.

[0065] Furthermore, the encoder 213 can monitor the rotational speed of the drive motor 211 in real time and feed this information back to the control system. The control system compares the set speed requirement with the actual rotational speed fed back by the encoder 213, and adjusts parameters such as the input voltage and frequency of the drive motor 211 to achieve precise control of the motor speed. This enables the linear actuator to operate stably at the preset speed, reduces motion errors caused by speed fluctuations, and improves the stability and consistency of the linear actuator's motion.

[0066] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0067] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0068] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0069] In this utility model, unless otherwise explicitly 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.

[0070] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. 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.

[0071] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A linear actuator, characterized in that, include: A fixed base having a fixed track, the fixed track extending in the same direction as the fixed base, and the fixed track passing through the fixed base along the extending direction of the fixed base; A drive assembly, the drive assembly including a drive member having an output portion rotatable about a first axis parallel to the extension direction of the fixed base; A push rod assembly includes a stroke push rod and a connector. The connector connects the stroke push rod and the output part, and a portion of the connector is engaged with the fixed track. The output part rotates, causing a portion of the connector to rotate and move along the extension direction of the fixed track, so that the stroke push rod and the drive assembly move along the extension direction of the fixed base.

2. The linear actuator according to claim 1, characterized in that, The fixed base has a through hole in its extending direction, and the wall of the through hole has an internal thread, which forms the fixed track. The connecting member includes a connecting base and a connecting bearing. The outer peripheral wall of the connecting base has an external thread that matches the fixed track. The connecting base is fixedly connected to the output part. The connecting bearing connects the stroke push rod and the connecting base and is located on the side of the connecting base away from the drive assembly. The axial direction of the connecting bearing is collinear with the first axial direction.

3. The linear actuator according to claim 2, characterized in that, The connecting base includes a connecting hole, at least a portion of the output portion is placed within the connecting hole, and the radial dimension of the connecting base is greater than the radial dimension of the drive assembly.

4. The linear actuator according to claim 3, characterized in that, The connecting base has a groove on the side adjacent to the stroke push rod, at least a portion of the connecting bearing is placed in the groove, and the outer ring of the connecting bearing is fixedly connected to the side wall of the groove, and the inner ring of the connecting bearing is fixedly connected to one end of the stroke push rod.

5. The linear actuator according to claim 4, characterized in that, The connecting base also has an extension located at the bottom of the groove and extending toward the travel push rod. A portion of the extension is placed in the inner ring of the connecting bearing, and the extension is rotatable relative to the inner ring of the connecting bearing. The connecting hole passes through the extension.

6. The linear actuator according to claim 5, characterized in that, In the extending direction of the fixed base, the length of the extension is less than the size of the connecting bearing.

7. The linear actuator according to any one of claims 2-6, characterized in that, The sidewall of the through hole is provided with a concave arc groove, and the extending direction of the concave arc groove is consistent with the extending direction of the fixing seat.

8. The linear actuator according to claim 7, characterized in that, There are multiple concave arc grooves, which are arranged circumferentially at intervals along the axis of the through hole.

9. The linear actuator according to claim 8, characterized in that, The driving component includes a drive motor and a reducer connected in sequence, with the output shaft of the reducer forming an output section.

10. The linear actuator according to claim 9, characterized in that, The drive unit also includes an encoder, which is connected to the drive motor.

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