Linear actuator

Abstract

The utility model relates to the technical field of mechanical transmission, in particular to a linear actuator which comprises an installation seat, a motor, a lead screw, a main nut and a sleeve, the motor comprises a motor shell and an output shaft, the width direction of the motor shell is perpendicular to the axial direction of the output shaft, the length size of the motor shell is L, the width size of the motor shell is D, and L is larger than D; the axis of the lead screw and the axis of the output shaft are parallel and arranged in a spaced mode, in the radial direction of the lead screw, the motor only needs to occupy the space equivalent to the width dimension D of the motor shell, and the structure is compact. The main nut is in threaded connection with the lead screw, the sleeve is rotationally connected with the mounting base and fixedly arranged on the main nut in a sleeving mode, the output shaft is in transmission connection with the sleeve, and the output shaft is used for driving the sleeve to rotate. Therefore, the motor shell does not occupy extra space in the axial direction of the lead screw, the compactness of the structure is further improved, and the requirement of DSA on space can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical drive technical field especially, relates to a linear actuator. BACKGROUND

[0002] Linear actuator is widely used in automation industry, medical treatment, military industry and other fields. Among them, the axial telescopic size of linear actuator applied to DSA (Digital subtraction angiography) is very short, and the space requirement is very high.

[0003] The current linear module, such as the prior patent with the application number CN202420097646.5, discloses a kind of linear module actuator, motor is arranged perpendicular to screw shaft axial direction, which leads to the need to occupy larger space along the arrangement direction of motor, when applied to DSA, it will lead to bulky structure. UTILITY MODEL CONTENT

[0004] The utility model aims at: provide a kind of linear actuator, to solve the space occupation of linear actuator in motor arrangement direction is reduced.

[0005] The utility model provides a kind of linear actuator, the linear actuator includes:

[0006] Mounting seat;

[0007] Motor, including motor shell and output shaft, the motor shell is installed in the mounting seat, the length direction of the motor shell is parallel to the axial direction of the output shaft, the width direction of the motor shell is perpendicular to the axial direction of the output shaft, the length dimension of the motor shell is L, the width dimension of the motor shell is D, L>D;

[0008] Screw rod, the axis of the screw rod and the axis of the output shaft are parallel and interval arrangement;

[0009] Main nut, with the screw rod thread connection;

[0010] Sleeve, the sleeve is rotationally connected with the mounting seat, the sleeve is fixedly sleeved on the main nut, the output shaft is transmission connection with the sleeve, and the output shaft is used to drive the sleeve rotation, along the axial direction of the screw rod, the one end of the motor shell away from the mounting seat is always located between the two ends of the screw rod.

[0011] As the preferred technical scheme of linear actuator, the linear actuator further includes the worm wheel fixedly sleeved on the first end of the sleeve, the worm gear engaged with the worm wheel, the first gear fixed to the worm gear, and the second gear fixed to the output shaft, the second gear is engaged with the first gear, and the worm gear is rotationally connected with the mounting seat.

[0012] As the preferred technical solution of the linear actuator, the worm is provided with an adapter at one end away from the output shaft, and the adapter is used for plugging with a wrench.

[0013] As the preferred technical solution of the linear actuator, the first gear and the second gear are bevel gears; and / or, one of the first gear and the second gear is made of a metal material, and the other of the first gear and the second gear is made of a plastic material.

[0014] As the preferred technical solution of the linear actuator, the linear actuator further comprises a first angular contact ball bearing and a second angular contact ball bearing oppositely arranged along the axial direction of the screw rod, the inner rings of the first angular contact ball bearing and the second angular contact ball bearing are fixedly sleeved on the sleeve, and the outer rings of the first angular contact ball bearing and the second angular contact ball bearing are fixed on the mounting seat.

[0015] As the preferred technical solution of the linear actuator, the linear actuator further comprises a first bearing and a second bearing arranged at intervals along the axial direction of the worm, the inner rings of the first bearing and the second bearing are fixedly sleeved on the worm, the outer rings of the first bearing and the second bearing are fixed on the mounting seat, and the worm gear is located between the first bearing and the second bearing.

[0016] As the preferred technical solution of the linear actuator, the linear actuator further comprises a knuckle bearing fixedly connected with the screw rod, and a hinge shaft fixed on the mounting seat.

[0017] As the preferred technical solution of the linear actuator, the linear actuator further comprises a sliding sleeve fixedly sleeved on the screw rod, the sliding sleeve is located in the sleeve, and the sliding sleeve is in sliding fit with the inner wall of the sleeve, and the sliding sleeve and the knuckle bearing are respectively located at two ends of the screw rod.

[0018] As the preferred technical solution of the linear actuator, the linear actuator further comprises a sealing end cover connected to one end of the sleeve, and a sealing ring arranged between the sealing end cover and the sleeve.

[0019] As the preferred technical solution of the linear actuator, the linear actuator further comprises a safety nut fixed on the main nut, and the safety nut is sleeved on the screw rod, and the safety nut is configured to be capable of abutting or separating from the screw rod along the axial direction of the screw rod.

[0020] The linear actuator provided by the utility model has at least the following beneficial effects:

[0021] The linear actuator comprises a mounting base, a motor, a screw rod, a main nut and a sleeve, the motor comprises a motor shell and an output shaft, the motor shell is mounted on the mounting base, the length direction of the motor shell is parallel to the axial direction of the output shaft, the width direction of the motor shell is perpendicular to the axial direction of the output shaft, the length dimension of the motor shell is L, the width dimension of the motor shell is D, and L>D; the axial line of the screw rod and the axial line of the output shaft are parallel and arranged at intervals; the main nut is threadedly connected with the screw rod; the sleeve is rotationally connected with the mounting base, the sleeve is fixedly sleeved on the main nut, the output shaft is in transmission connection with the sleeve, and the output shaft is used for driving the sleeve to rotate, along the axial direction of the screw rod, the end of the motor shell away from the mounting base is always located between the two ends of the screw rod. The linear actuator, in the radial direction of the screw rod, the motor needs to additionally occupy a space corresponding to the width dimension D of the motor shell, in the prior art, the axial line of the screw rod is perpendicular to the output shaft of the motor, which corresponds to the space occupied by the motor in the radial direction of the screw rod, and the length dimension L of the motor shell is L>D, thereby effectively reducing the space occupied by the motor in the radial direction of the screw rod, making the structure of the linear actuator more compact, and the end of the motor shell away from the mounting base is always located between the two ends of the screw rod in the axial direction of the screw rod, so that the linear actuator does not additionally occupy space in the axial direction of the screw rod, and the structure of the linear actuator is further compact, when the linear actuator is applied to DSA, the requirement of space can be met. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure schematic view of the linear actuator in the embodiment of the utility model;

[0023] Figure 2 It is a partial structure schematic view of the linear actuator in the embodiment of the utility model;

[0024] Figure 3 It is a sectional view of the linear actuator in the embodiment of the utility model;

[0025] Figure 4 It is a first partial structure sectional view of the linear actuator in the embodiment of the utility model;

[0026] Figure 5 It is a second partial structure sectional view of the linear actuator in the embodiment of the utility model.

[0027] In the drawing:

[0028] 1, mounting seat; 2, motor; 201, motor shell; 202, output shaft; 3, screw; 4, main nut; 5, sleeve; 6, worm; 7, worm; 8, first gear; 9, second gear; 10, first angular contact ball bearing; 11, second angular contact ball bearing; 12, deep groove ball bearing; 13, first bearing; 14, second bearing; 15, sliding sleeve; 16, plug-in part; 17, safety nut; 18, sealing end cover; 19, sealing ring; 20, knuckle bearing; 21, articulated shaft. DETAILED DESCRIPTION

[0029] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0030] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the first feature is "above", "above" and "above" of the second feature, which includes the first feature above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature is "below", "below" and "below" of the second feature, which includes the first feature below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0031] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] The embodiments of the present application are described below in detail, examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used to explain the present application, and cannot be understood as a limitation of the present application.

[0033] The axial telescopic size of the linear actuator applied to the DSA is short, and the space requirement is high, while the motor of the existing linear actuator is arranged vertically to the screw shaft, which leads to a large space occupied along the arrangement direction of the motor, and when applied to the DSA, it leads to a bulky structure.

[0034] To this end, the present embodiment provides a linear actuator to solve the above technical problems.

[0035] Please refer to Figures 1 to 5 The linear actuator comprises a mounting seat 1, a motor 2, a screw 3, a main nut 4 and a sleeve 5. The motor 2 comprises a motor shell 201 and an output shaft 202, the motor shell 201 is mounted on the mounting seat 1, the length direction of the motor shell 201 is parallel to the axial direction of the output shaft 202, the width direction of the motor shell 201 is perpendicular to the axial direction of the output shaft 202, the length dimension of the motor shell 201 is L, the width dimension of the motor shell 201 is D, L>D; the axis of the screw 3 and the axis of the output shaft 202 are parallel and spaced apart; the main nut 4 is threadedly connected with the screw 3; the sleeve 5 is rotatably connected with the mounting seat 1, the sleeve 5 is fixedly sleeved on the main nut 4, the output shaft 202 is drivingly connected with the sleeve 5, and the output shaft 202 is used to drive the sleeve 5 to rotate, and along the axial direction of the screw 3, the end of the motor shell 201 away from the mounting seat 1 is always located between the two ends of the screw 3.

[0036] The linear actuator provided by the present embodiment, when the motor 2 works, the output shaft 202 drives the main nut 4 to rotate, and the main nut 4 drives the screw 3 to extend or retract, since the axis of the screw 3 and the axis of the output shaft 202 of the motor 2 are arranged in parallel, in the radial direction of the screw 3, the motor 2 only needs to additionally occupy a space corresponding to the width dimension D of the motor shell 201, while in the prior art, the axis of the screw and the output shaft of the motor are perpendicular, which means that in the radial direction of the screw, the motor needs to additionally occupy a space corresponding to the length dimension L of the motor shell, and L>D, so that the linear actuator in the present embodiment can effectively reduce the space occupied by the motor 2 in the radial direction of the screw 3, so that the structure of the linear actuator is more compact; and in the axial direction of the screw 3, the end of the motor shell 201 away from the mounting seat 1 is always located between the two ends of the screw 3, so that the linear actuator does not additionally occupy space in the axial direction of the screw 3, which can make the structure of the linear actuator further compact, when the linear actuator is applied to the DSA, it can effectively reduce the space occupation, and further simplify the overall volume.

[0037] It can be understood that when the main nut 4 drives the lead screw 3 to extend or retract, the external part connected with the lead screw 3 can limit the lead screw 3 from rotating synchronously with the main nut 4, and make the lead screw 3 extend or retract.

[0038] In addition, the main nut 4 can drive the lead screw 3 to extend or retract so that the lead screw 3 has an extended position and a retracted position. In the axial direction of the lead screw 3, the end of the motor housing 201 away from the mounting base 1 is always located between the two ends of the lead screw 3, which makes the end of the motor housing 201 away from the mounting base 1 always not beyond the lead screw 3, and the end of the motor housing 201 connected with the mounting base 1 does not beyond the mounting base 1, so that the space length occupied by the motor 2 in the axial direction of the lead screw 3 is always less than the space length occupied by the mounting base 1 and the lead screw 3 as a whole. Therefore, the axis of the output shaft 202 of the motor 2 is arranged parallel to the axis of the lead screw 3, which does not make the motor 2 occupy additional space in the axial direction of the lead screw 3.

[0039] Specifically, please refer to Figure 2 and Figure 5 In the embodiment, the value of L / D is specifically 2.3. The linear actuator can reduce the space occupation in the radial direction of the lead screw 3 by 56% of the length dimension of the motor housing 201. In other embodiments, the ratio of L and D can also be set according to actual needs, such as 2.1, 2.2, 2.4 or 2.5, etc.

[0040] Optionally, please refer to Figure 3 and Figure 4 The linear actuator further comprises a sliding sleeve 15 fixedly sleeved on the lead screw 3, the sliding sleeve 15 is located in the sleeve 5, and the sliding sleeve 15 and the inner wall of the sleeve 5 are in sliding fit, and the sliding sleeve 15 and the joint bearing 20 are respectively located at the two ends of the lead screw 3. The sleeve 5 supports the lead screw 3 through the sliding sleeve 15, which can ensure that the lead screw 3 remains stable when extending or retracting relative to the sleeve 5, avoid the lead screw 3 and the main nut 4 bearing radial force, and reduce the noise when the lead screw 3 operates. The sliding sleeve 15 is preferably made of self-lubricating material, such as nylon.

[0041] Optionally, please continue to refer to Figure 3 and Figure 4, the linear actuator further comprises a first angular contact ball bearing 10 and a second angular contact ball bearing 11 oppositely arranged along the axial direction of the screw rod 3, the inner ring of the first angular contact ball bearing 10 and the inner ring of the second angular contact ball bearing 11 are fixedly sleeved on the sleeve 5, and the outer ring of the first angular contact ball bearing 10 and the outer ring of the second angular contact ball bearing 11 are fixed on the mounting base 1. The sleeve 5 is rotationally connected with the mounting base 1 through the two oppositely arranged angular contact ball bearings, which can not only enable the sleeve 5 to bear a larger axial load, but also enable the sleeve 5 to bear a larger radial load, so that the sleeve 5 can be stably supported by the mounting base 1, the external force borne by the sleeve 5 is prevented from being concentrated on the worm wheel 6, the deformation of the worm wheel 6 is prevented, the noise caused by the deformation of the worm wheel 6 when the worm wheel 6 and the worm 7 are matched is prevented, the worm wheel 6 only plays a role in transmitting torque, and the transmission accuracy is ensured. In the embodiment, the first angular contact ball bearing 10 and the second angular contact ball bearing 11 are angular contact ball bearings with a support angle of 60 degrees.

[0042] Optionally, please continue to refer to Figure 3 and Figure 4 , the first angular contact ball bearing 10 and the second angular contact ball bearing 11 are arranged in sequence and oppositely along the axial direction of the screw rod 3, the linear actuator further comprises a deep groove ball bearing 12, the first angular contact ball bearing 10, the second angular contact ball bearing 11 and the deep groove ball bearing 12 are arranged in sequence along the axial direction of the screw rod 3, and the second angular contact ball bearing 11 and the deep groove ball bearing 12 are arranged on the two sides of the worm wheel 6, the inner ring of the deep groove ball bearing 12 is fixed on the sleeve 5, and the outer ring of the deep groove ball bearing 12 is fixed on the mounting base 1. The deep groove ball bearing 12 is arranged to further enhance the radial load bearing capacity of the sleeve 5.

[0043] Optionally, please refer to Figure 2 , the linear actuator further comprises the worm wheel 6 fixedly sleeved on the first end of the sleeve 5, the worm 7 engaged with the worm wheel 6, the first gear 8 fixed on the worm 7, and the second gear 9 fixed on the output shaft 202, the second gear 9 is engaged with the first gear 8, and the worm 7 is rotationally connected with the mounting base 1. Through the cooperation of the worm wheel 6 and the worm 7, the stable transmission of torque between the motor 2 and the sleeve 5 can be ensured. In other embodiments, the linear actuator can further comprise a first pulley fixedly sleeved on the output shaft 202, a second pulley fixedly sleeved on the sleeve 5, and a synchronous belt connected between the first pulley and the second pulley.

[0044] In the embodiment, the first gear 8 and the second gear 9 are bevel gears, which can ensure the stable transmission of torque between the motor 2 and the worm 7. In other embodiments, the first gear 8 and the second gear 9 can also be replaced by helical gears and the like.

[0045] Optionally, one of the first gear 8 and the second gear 9 is made of a metal material, and the other of the first gear 8 and the second gear 9 is made of a plastic material. In this way, the noise generated when the first gear 8 and the second gear 9 cooperate with each other can be reduced, thereby achieving silent operation. Preferably, the metal material is steel. In other embodiments, both the first gear 8 and the second gear 9 can also be made of metal materials at the same time.

[0046] Optionally, referring to Figure 5 , the linear actuator further comprises a first bearing 13 and a second bearing 14 which are arranged axially spaced apart along the worm 7, the inner ring of the first bearing 13 and the inner ring of the second bearing 14 are fixedly sleeved on the worm 7, the outer ring of the first bearing 13 and the outer ring of the second bearing 14 are fixed to the mounting seat 1, and the worm gear 6 is located between the first bearing 13 and the second bearing 14. In this way, the mounting seat 1 can stably support the worm 7 in the radial direction of the worm 7 through the first bearing 13 and the second bearing 14. Specifically, in the present embodiment, the first bearing 13 is located between the first gear 8 and the worm gear 6, and the worm gear 6 is located between the first bearing 13 and the second bearing 14. The first bearing 13 and the second bearing 14 are preferably deep groove ball bearings.

[0047] Optionally, referring to Figure 1 , the end of the worm 7 away from the output shaft 202 is provided with a plug-in part 16 for plugging with a wrench. The plug-in part 16 is exposed to the mounting seat 1 so as to facilitate the cooperation of the plug-in part 16 with the wrench. In this way, the wrench can be plugged with the plug-in part 16, and the worm 7 can be driven to rotate by the wrench. In the event of sudden power failure or malfunction, the worm 7 can be manually operated by the wrench, thereby ensuring safety in use. Specifically, one of the plug-in part 16 and the wrench is provided with a polygonal socket, and the other of the plug-in part 16 and the wrench is provided with a polygonal plug. The socket can be hexagonal or quadrangular, etc. In the present embodiment, the plug-in part 16 is provided with a hexagonal socket, and the wrench is provided with a hexagonal plug.

[0048] Optionally, referring to Figure 1 , the linear actuator further comprises a knuckle bearing 20 fixedly connected with the lead screw 3, and a hinge shaft 21 fixed to the mounting seat 1. The knuckle bearing 20 is used for ball hinge with a movable external part, and the hinge shaft 21 is used for pivot connection with a fixed external part. Preferably, the linear actuator comprises two hinge shafts 21 which are arranged spaced apart and coaxially on both sides of the mounting seat 1.

[0049] Optionally, referring to Figure 3 and Figure 4The linear actuator further comprises a safety nut 17 fixed to the main nut 4 and sleeved on the screw rod 3, and the safety nut 17 is configured to abut or separate from the screw rod 3 along the axial direction of the screw rod 3. Specifically, the thread type of the safety nut 17 is slightly larger than the thread type of the main nut 4, the pitch of the safety nut 17 is equal to the pitch of the main nut 4, the thread type of the main nut 4 is matched with the thread type of the screw rod 3, and the pitch of the main nut 4 is matched with the pitch of the screw rod 3. When the main nut 4 is in a normal state without failure, the main nut 4 and the screw rod 3 are normally screwed, the safety nut 17 is in clearance fit with the screw rod 3, and the main nut 4 can drive the screw rod 3 to reciprocate along the axial direction thereof; when the main nut 4 is in a failure state, the thread of the main nut 4 is damaged, the main nut 4 can no longer drive the screw rod 3 to reciprocate along the axial direction thereof, and the screw rod 3 will be axially displaced relative to the main nut 4. At this time, the safety nut 17 abuts against the screw rod 3 along the axial direction of the screw rod 3 to prevent the screw rod 3 from falling off, thereby ensuring the safety of the linear actuator.

[0050] Optionally, please continue to refer to Figure 3 and Figure 4 The linear actuator further comprises a sealing end cover 18 connected to one end of the sleeve 5 and a sealing ring 19 arranged between the sealing end cover 18 and the sleeve 5. Specifically, the sealing end cover 18 is located at the bottom end of the sleeve 5, and the bottom end of the sleeve 5 is closed by the sealing end cover 18 and the sealing ring 19, so as to prevent the lubricating oil in the sleeve 5 from flowing out. It can be understood that the screw rod 3 reciprocates to extend or retract, the sliding sleeve 15 is always located in the sleeve 5 and does not contact the sealing end cover 18. Preferably, the holes for the sleeve 5 and the worm 7 to pass through are provided with plugs at both ends of the mounting seat 1, so as to prevent the lubricating oil in the mounting seat 1 from leaking.

[0051] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled persons in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A linear actuator, characterized by The linear actuator comprises: a mounting base (1); a motor (2) comprising a motor shell (201) and an output shaft (202), the motor shell (201) is mounted on the mounting base (1), the length direction of the motor shell (201) is parallel to the axial direction of the output shaft (202), the width direction of the motor shell (201) is perpendicular to the axial direction of the output shaft (202), the length dimension of the motor shell (201) is L, the width dimension of the motor shell (201) is D, and L>D; a screw rod (3), the axis of the screw rod (3) is parallel to the axis of the output shaft (202) and is arranged in a spaced manner; a main nut (4) in threaded connection with the screw rod (3); a sleeve (5) in rotational connection with the mounting base (1), the sleeve (5) is fixedly sleeved on the main nut (4), the output shaft (202) is in transmission connection with the sleeve (5), and the output shaft (202) is used to drive the sleeve (5) to rotate, and along the axial direction of the screw rod (3), the end of the motor shell (201) away from the mounting base (1) is always located between the two ends of the screw rod (3).

2. The linear actuator of claim 1, wherein, The linear actuator further comprises a worm wheel (6) fixedly sleeved on the first end of the sleeve (5), a worm gear (7) in meshing connection with the worm wheel (6), a first gear (8) fixed to the worm gear (7), and a second gear (9) fixed to the output shaft (202), the second gear (9) is in meshing connection with the first gear (8), and the worm gear (7) is in rotational connection with the mounting base (1).

3. The linear actuator of claim 2, wherein, An insertion part (16) is arranged at the end of the worm gear (7) away from the output shaft (202), and the insertion part (16) is used for insertion with a wrench.

4. The linear actuator of claim 2, wherein, The first gear (8) and the second gear (9) are bevel gears; and / or, One of the first gear (8) and the second gear (9) is made of a metal material, and the other of the first gear (8) and the second gear (9) is made of a plastic material.

5. The linear actuator of claim 2, wherein, The linear actuator further comprises a first angular contact ball bearing (10) and a second angular contact ball bearing (11) arranged in a spaced manner along the axial direction of the screw rod (3), the inner ring of the first angular contact ball bearing (10) and the inner ring of the second angular contact ball bearing (11) are fixedly sleeved on the sleeve (5), and the outer ring of the first angular contact ball bearing (10) and the outer ring of the second angular contact ball bearing (11) are fixed to the mounting base (1).

6. The linear actuator of claim 2, wherein, The linear actuator further comprises a first bearing (13) and a second bearing (14) arranged in a spaced manner along the axial direction of the worm gear (7), the inner ring of the first bearing (13) and the inner ring of the second bearing (14) are fixedly sleeved on the worm gear (7), the outer ring of the first bearing (13) and the outer ring of the second bearing (14) are fixed to the mounting base (1), and the worm wheel (6) is located between the first bearing (13) and the second bearing (14).

7. The linear actuator of claim 1, wherein, The linear actuator further comprises a knuckle bearing (20) fixedly connected with the screw rod (3), and a hinge shaft (21) fixed to the mounting base (1).

8. The linear actuator of claim 7, wherein, The linear actuator further comprises a sliding sleeve (15) fixedly sleeved on the screw rod (3), wherein the sliding sleeve (15) is located in the sleeve (5), and the sliding sleeve (15) is in sliding fit with the inner wall of the sleeve (5), and the sliding sleeve (15) and the knuckle bearing (20) are respectively located at two ends of the screw rod (3).

9. The linear actuator of claim 8, wherein, The linear actuator further comprises a sealing end cover (18) connected to one end of the sleeve (5), and a sealing ring (19) arranged between the sealing end cover (18) and the sleeve (5).

10. Linear actuator according to any of claims 1-9, characterized in that The linear actuator further comprises a safety nut (17), wherein the safety nut (17) is fixed to the main nut (4), and the safety nut (17) is sleeved on the screw rod (3), and the safety nut (17) is configured to be capable of abutting or separating from the screw rod (3) along the axial direction of the screw rod (3).

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