Linear drive mechanism

Abstract

Provided in the present invention is a linear drive mechanism, which comprises a housing, a front cover, a rear cover, a stator and a rotor. The housing comprises a first housing and a second housing. The linear drive mechanism further comprises a rolling lead screw, a first bearing and a second bearing; the rolling lead screw comprises a sleeve which is provided inside the first housing and passes through the front cover, a lead screw nut fixed in the end of the sleeve close to the rear cover, and a central lead screw provided in the lead screw nut and extending in the axial direction of the lead screw nut. The outer circumferential side of the sleeve is in sliding connection with the inner side of the first housing. The lead screw nut is sleeved on the central lead screw and is rotationally connected to the central lead screw. The connection position of the end of the central lead screw close to the rear cover and the rotor is of an integrally-formed structure. The rotor rotates to drive the central lead screw to rotate, so that the lead screw nut rotates to drive the sleeve to perform a linear telescoping motion. Compared with the prior art, the linear drive mechanism of the present invention has a high integration level, achieves a good linear drive effect, saves cost and mounting space, and improves production efficiency.

Description

Linear drive mechanism Technical Field

[0001] The present invention relates to the field of linear drive technology, and in particular to a linear drive mechanism. Background Art

[0002] The rapid development of the artificial intelligence and robotics industries is placing stricter demands on linear actuators due to space and energy efficiency requirements. These actuators are moving towards higher integration, smaller size, higher load capacity, and faster response. A linear drive mechanism is a type of linear actuator that uses a lead screw as the active element and a nut as the linear output. This means the nut does not rotate but telescopes along its axis, while the lead screw rotates. Technical issues

[0003] In the related art, standard linear screw actuators mostly use coaxial transmission mechanisms, where the motor extends the shaft through gears or couplings, rotates the shaft, and pushes the nut to move forward or backward axially. Alternatively, they use parallel transmission mechanisms, where the power source, such as an electric motor or internal combustion engine shaft, outputs torque, which is transmitted to parallel screw shafts through gears or belts. However, in standard planetary roller screws, the screw shaft is always the active element. If the motor is used as the power source, the motor rotor shaft and the planetary roller screw shaft are integrated together. The motor has a large outer diameter, and the planetary roller screw nut also has a certain size. The two are spatially arranged in a series structure along the axial direction. At the same time, for system safety, a housing must be provided to constrain the outer diameter of the motor stator and the outer part of the nut into a single integral housing, which increases the overall size of the planetary roller screw linear actuator.

[0004] Therefore, it is necessary to provide a new linear drive mechanism to solve the above technical problems. Solution

[0005] The object of the present invention is to provide a linear drive mechanism with high integration, good linear drive effect, cost saving, installation space saving and improved production efficiency.

[0006] To achieve the above-mentioned object, the present invention provides a linear drive mechanism, comprising a housing, a front cover and a rear cover respectively fixed to opposite ends of the housing, a stator disposed in the housing, and a rotor disposed in the stator, wherein the stator drives the rotor to rotate; the housing comprises a first housing and a second housing fixedly connected to each other, an end of the first housing away from the second housing being fixed to the front cover, and an end of the second housing away from the first housing being fixed to the rear cover; the linear drive mechanism further comprises a rolling screw fixed to an end of the rotor away from the rear cover, a first bearing sleeved and fixed to one end of the rotor and fixed to the second housing, and a second bearing sleeved and fixed to the other end of the rotor and fixed to the rear cover;

[0007] The rolling screw includes a sleeve arranged in the first housing and passing through the front cover, a screw nut fixed in the end of the sleeve close to the rear cover, and a center screw arranged in the screw nut and extending along the axial direction of the screw nut; the outer peripheral side of the sleeve forms a sliding connection with the inner side of the first housing, and the screw nut is sleeved on the center screw and forms a rotational connection with the center screw; the connection between the end of the center screw close to the rear cover and the rotor is an integrally formed structure, and the rotation of the rotor drives the center screw to rotate, so that the rotation of the screw nut drives the sleeve to realize linear telescopic motion.

[0008] Preferably, the rolling screw is a planetary roller screw, and the screw nut includes a first nut body with a threaded structure, a first and a second annular mounting groove formed by depressions at two ends of an inner wall of the first nut body, a first gear ring fixedly disposed in the first mounting groove, a second gear ring fixedly disposed in the second mounting groove, and a plurality of annular screw rod columns disposed around the central screw, with the two ends of each annular screw rod column respectively disposed at the first gear ring and the second gear ring to form a rotational connection; the first nut body is fixed in the sleeve;

[0009] The central screw comprises a first central screw body which is arranged in the first nut body and has a threaded structure; the first central screw body is respectively engaged with each of the annular screw columns, and each of the annular screw columns is engaged with the first nut body.

[0010] Preferably, the rolling screw is a ball screw, and the screw nut includes a second nut body, a first ball groove in a threaded shape recessed on the inner circumference of the second nut body, and a plurality of balls arranged in the first ball groove; the second nut body is fixedly arranged in the sleeve;

[0011] The center screw includes a second center screw body arranged in the second nut body and a second threaded ball groove formed by a peripheral depression of the second center screw body. The first ball groove and the second ball groove are arranged correspondingly, and the balls are clamped between the first ball groove and the second ball groove so that the second center screw body and the second nut body form a rolling connection.

[0012] Preferably, the linear drive mechanism further comprises a locking nut, which is sleeved and fixed on an end of the rotor away from the rear cover, and the locking nut abuts against a side of the first bearing away from the rear cover.

[0013] Preferably, the linear drive mechanism further includes a first end rod bearing and a second end rod bearing; the first end rod bearing is fixed to an end of the sleeve away from the rear cover, and the second end rod bearing is fixed to the rear cover.

[0014] Preferably, the rotor includes a rotor body, a plurality of permanent magnets formed on the outer peripheral side of the rotor body, an annular bearing stop protruding and extending from the outer periphery of the rotor body, and a limiting groove formed by a depression at one end of the outer periphery of the rotor body close to the rear cover; the end of the rotor body away from the rear cover is fixed to the center screw, each of the permanent magnets is spaced apart from the stator, the bearing stop abuts against the side of the first bearing close to the rear cover, and the second bearing is sleeved and fixed in the limiting groove.

[0015] Preferably, the linear drive mechanism further includes a position sensor, which includes a collecting part fixed to the rear cover and a rotating part fixed to the rotor, and the collecting part and the rotating part are arranged relative to each other and spaced apart.

[0016] Preferably, the motor formed by the stator and the rotor together adopts an 8-pole 9-slot structure, a 10-pole 12-slot structure, a 14-pole 12-slot structure, or a 16-pole 12-slot structure.

[0017] Preferably, the position sensor is a Hall position sensor, a magnetic encoding position sensor or an optical encoding position sensor.

[0018] Preferably, the linear drive mechanism further includes a base fixed in the second housing, and the second bearing is fixed in the base.

[0019] Preferably, the base includes a base body fixed in the second housing and a base groove formed by an end of the base body close to the front cover being recessed toward an end close to the rear cover; the second bearing is fixed in the base groove. Beneficial effects

[0020] Compared with the prior art, in the linear drive mechanism of the present invention, the stator drives the rotor to rotate in the housing, the center screw is set at one end of the rotor, the first housing and the second housing are fixed correspondingly, and the other end of the first housing is fixed to the front cover, and the other end of the second housing is fixed to the back cover, thereby realizing the regional separation of the motor area and the rolling screw, and improving the assembly efficiency; the rolling screw includes a sleeve set in the first housing and passing through the front cover, a screw nut fixed in the sleeve near the back cover, and a center screw set in the screw nut and extending along the axial direction of the screw nut; the outer peripheral side of the sleeve forms a sliding connection with the inner side of the first housing, and the screw nut is sleeved on the center screw and forms a rotational connection with the center screw; the connection between the end of the center screw near the back cover and the rotor is an integrally formed structure, and the rotation of the rotor drives the center screw to rotate, so that the screw nut rotates and drives the sleeve to realize linear telescopic motion. By installing the first bearing and the second bearing at both ends of the rotor, the rotor will not move axially when it rotates. As the rotor rotates through the center lead screw, it transmits torque to the lead nut, converting it into thrust. This interaction of forces propels the lead nut axially, thereby achieving linear motion for the sleeve. Furthermore, integrating the center lead screw of the rolling lead screw with the rotor effectively shortens the length of the integrated center lead screw and rotor. The lead nut can be machined independently, simplifying manufacturing and processes, improving production efficiency, and further reducing costs and installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0022] FIG1 is a schematic diagram of the three-dimensional structure of a linear drive mechanism provided in Example 1 of the present invention;

[0023] FIG2 is an exploded perspective view of the linear drive mechanism according to the first embodiment of the present invention;

[0024] FIG3 is a cross-sectional view taken along line AA of FIG1 ;

[0025] FIG4 is a schematic diagram of the three-dimensional structure of a linear drive mechanism provided in Embodiment 2 of the present invention;

[0026] FIG5 is a cross-sectional view taken along line BB in FIG4 . Modes for Carrying Out the Invention

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] As shown in Figures 1 to 3, an embodiment of the present invention provides a linear drive mechanism 100, comprising a housing 1, a front cover 3 and a rear cover 2 respectively fixed to opposite ends of the housing 1, a stator 4 disposed within the housing 1, and a rotor 5 disposed within the stator 4 and rotatably connected to the stator 4. The housing 1 comprises a first housing 11 and a second housing 12 fixedly connected relative to each other, the other end of the first housing 11 being fixed to the front cover 3, and the other end of the second housing 12 being fixed to the rear cover 2. The linear drive mechanism 100 further comprises a rolling screw 6 fixed to an end of the rotor 5 away from the rear cover 2, a first bearing 7 sleeved around one end of the rotor 5 and fixed within the second housing 12, and a second bearing 8 sleeved around the other end of the rotor 5 and fixed to the rear cover 2. Optionally, the rotor 5 is a hollow rotor shaft to reduce the inertia of the rotor 5.

[0029] In this embodiment, the first bearing 7 is a four-point contact bearing or an angular contact bearing, and the second bearing 8 is a deep groove ball bearing. By installing the first bearing 7 and the second bearing 8 at both ends of the rotor 5, the rotor 5 will not move axially when it rotates.

[0030] The rolling screw 6 can be a planetary roller screw, which includes a sleeve 63 arranged in the first housing 11 and passing through the front cover 3, a screw nut 62 fixed in the sleeve 63 near the end of the rear cover 2, and a center screw 61 arranged in the screw nut 62; the outer peripheral side of the sleeve 63 forms a sliding connection with the first housing 11, and the screw nut 62 is sleeved on the center screw 61 and forms a rotational connection with the center screw 61; the end of the center screw 61 near the rear cover 2 is fixed to the rotor 5 to form an integral structure, and the rotor 5 rotates to drive the center screw 61 to rotate, so that the screw nut 62 rotates to drive the sleeve 63 to achieve linear telescopic motion. Optionally, the sleeve 63 and the screw nut 62 can be threadedly fixed or pinned. After connection, the rotor 5 and the screw nut 62 can rotate coaxially. The screw nut 62 rotates synchronously with the rotor 55 as the active component, and the center screw 61 performs axial telescopic operation.

[0031] Specifically, the stator 4 and the rotor 5 generate magnetic fields with each other. Since the stator 4 is fixed to the second housing 12, the rotor 5 is driven by the stator 4 to rotate. During the rotation of the center screw 61, the rotor 5 transmits torque to the screw nut 62, which is converted into thrust. According to the interaction of forces, the screw nut 62 will be pushed to move axially, thereby realizing the linear drive motion function of the sleeve 63. At the same time, the center screw 61 of the rolling screw 6 is formed into an integral structure with the rotor 5, which will effectively shorten the length of the integration of the center screw 61 and the rotor 5. The screw nut 62 can be processed independently, which simplifies the manufacturing difficulty and process and improves production efficiency. It further saves costs and installation space.

[0032] In this embodiment, the linear drive mechanism 100 further includes a sliding bearing 23 , which is fixed in the front cover 3 . The sleeve 63 is disposed in the sliding bearing 23 , and the sleeve 63 forms a sliding connection with the sliding bearing 23 .

[0033] In this embodiment, the linear drive mechanism 100 further includes a sealing ring 24, which is fixed in the front cover 3 and disposed on a side of the sliding bearing 23 away from the rear cover 2. The sealing ring 24 ensures sealing between the sleeve 63 and the front cover 3.

[0034] In this embodiment, the screw nut 62 includes a first nut body 621 having a threaded structure, a first annular mounting groove 622 and a second annular mounting groove 623 formed by depressions at both ends of the inner wall of the first nut body 621, a first gear ring 624 fixedly disposed in the first mounting groove 622, a second gear ring 625 fixedly disposed in the second mounting groove 623, and a plurality of annular screw posts 626 disposed around the center screw 61, each of the annular screw posts 626 being rotatably connected to the first gear ring 624 and the second gear ring 625 at both ends. The first nut body 621 is fixed in the sleeve 63. The center screw 61 includes a first center screw 611 body disposed in the first nut body 621 and having a threaded structure. The first center screw 611 body is engaged with each annular screw post 626, and each annular screw post 626 is engaged with the first nut body 621. A number of annular screw columns 626 are installed through the first gear ring 624 and the second gear ring 625, so that the first center screw 611 body and the number of annular screw columns 626 are engaged with each other, and the number of annular screw columns 626 are engaged with the first nut body 621. The stator 4 drives the rotor 5 to rotate the first center screw 611 body, and the first center screw 611 body drives the number of annular screw columns 626 to rotate, thereby driving the first screw nut 62 body to rotate, and at the same time driving the sleeve 63 on the first center screw 611 body to perform linear telescopic motion.

[0035] In this embodiment, the linear drive mechanism 100 further includes a locking nut 9, which is sleeved and fixed to the end of the rotor 5 away from the rear cover 2. The locking nut 9 abuts the side of the first bearing 7 away from the rear cover 2. The locking nut 9 restricts the axial movement of the first bearing 7, thereby preventing the rotor 5 within the first bearing 7 from axial movement.

[0036] In this embodiment, the linear drive mechanism 100 further includes a first end rod bearing 21 and a second end rod bearing 22; the first end rod bearing 21 is fixed to the end of the sleeve 63 away from the rear cover 2, and the second end rod bearing 22 is fixed to the rear cover 2. The rotor 5 drives the central screw 61 to rotate, causing the screw nut 62 to rotate and achieve linear telescopic motion, thereby driving the sleeve 63 connected thereto to perform linear telescopic motion, causing the first end rod bearing 21 to perform linear motion of extension or retraction.

[0037] In this embodiment, the rotor 5 includes a rotor body 51, a plurality of permanent magnets 54 formed on the outer circumference of the rotor body 51, an annular bearing stop 52 extending from the outer circumference of the rotor body 51, and a limiting groove 53 formed by a recessed end of the outer circumference of the rotor body 51 near the rear cover 2. The end of the rotor body 51 away from the rear cover 2 is fixed to the center screw 61, and each permanent magnet 54 is spaced apart from the stator 4. The bearing stop 52 abuts the side of the first bearing 7 near the rear cover 2, and the second bearing 8 is sleeved and fixed in the limiting groove 53. The bearing stop 52 abuts one end of the first bearing 7, while the other end is abutted by a locking nut 9, thereby ensuring that the axial position of the rotor 5 is restricted.

[0038] In this embodiment, the linear drive mechanism 100 further includes a position sensor 10, which comprises a collecting portion 101 fixed to the rear cover 2 and a rotating portion 102 fixed to the rotor 5. The collecting portion 101 and the rotating portion 102 are spaced relative to each other. As the rotating portion 102 rotates with the rotor 5, the collecting portion 101 collects the angle and number of revolutions of the rotating portion 102, thereby obtaining the corresponding rotation angle and number of revolutions of the center screw 61. Based on the rotation of the center screw 61, the corresponding linear extension and retraction distance of the screw nut 62 is obtained.

[0039] In this embodiment, the motor formed by the stator 4 and the rotor 5 adopts an 8-pole 9-slot structure, a 10-pole 12-slot structure, a 14-pole 12-slot structure, or a 16-pole 12-slot structure. For example, an 8-pole 9-slot structure represents 8 permanent magnet poles and 9 stator slots.

[0040] In this embodiment, the position sensor 10 is a Hall position sensor, a magnetic encoding position sensor or an optical encoding position sensor.

[0041] In this embodiment, the linear drive mechanism 100 further includes a base 20 fixed in the second housing 12, and the second bearing 8 is fixed in the base 20. This facilitates the fixing of the second bearing 8 and provides a good supporting effect.

[0042] In this embodiment, the base 20 includes a base body 201 fixed within the second housing 12 and a base groove 202 formed by recessing the end of the base body 201 near the front cover 3 toward the end near the rear cover 2. The second bearing 8 is fixed within the base groove 202. This facilitates installation of the second bearing 8 and saves installation space.

[0043] In this embodiment, the linear drive mechanism 100 is applied to the limb joints of the robot to electrically drive the linear actuator, which has a high degree of integration and a simplified process.

[0044] Example 2

[0045] As shown in Figures 1 to 5, the structure of the second embodiment is the same as that of part of the embodiment, and its distinguishing feature is that the rolling screw 6 can be a ball screw, and the screw nut 62 includes a second nut body 627, a first ball groove 628 in the form of a thread formed on the inner peripheral side of the second nut body 627, and a plurality of balls arranged in the first ball groove 628; the second nut body 627 is fixedly arranged in the sleeve 63; the center screw 61 includes a second center screw 612 body arranged in the second nut body 627 and a second ball groove 613 in the form of a thread formed by a recessed outer periphery of the second center screw 612 body, the first ball groove 628 and the second ball groove 613 are arranged correspondingly, and the balls are all clamped between the first ball groove 628 and the second ball groove 613 so that the second center screw 612 body and the second nut body 627 form a rolling connection. The rotor 5 rotates, driving the body of the second center screw 612 of the center screw 61 to rotate. Balls are arranged in the first ball groove 628 and the second ball groove 613. When the second center screw 612 body rotates, it drives the second nut body 627 to rotate, achieving linear telescopic motion. Because the second center screw 612 body is fixedly connected to the rotor 5, the second center screw 612 body does not move axially. During rotation, the rotor 5 transmits torque to the center screw 61 via ball transmission, converting it into thrust. Because the center screw 61 is restricted from axial motion, the interaction of forces pushes the second nut body 627 to move axially. Because the sleeve 63 is fixed to the outer periphery of the second nut body 627, when the second nut body 627 performs linear telescopic motion, the sleeve 63 also pushes the first end rod bearing 21 to achieve linear telescopic motion.

[0046] Compared with the prior art, in the linear drive mechanism of the present invention, the stator drives the rotor to rotate in the housing, the center screw is set at one end of the rotor, the first housing and the second housing are fixed correspondingly, and the other end of the first housing is fixed to the front cover, and the other end of the second housing is fixed to the back cover, thereby realizing the regional separation of the motor area and the rolling screw, and improving the assembly efficiency; the rolling screw includes a sleeve set in the first housing and passing through the front cover, a screw nut fixed in the sleeve near the back cover, and a center screw set in the screw nut and extending along the axial direction of the screw nut; the outer peripheral side of the sleeve forms a sliding connection with the inner side of the first housing, and the screw nut is sleeved on the center screw and forms a rotational connection with the center screw; the connection between the end of the center screw near the back cover and the rotor is an integrally formed structure, and the rotation of the rotor drives the center screw to rotate, so that the screw nut rotates and drives the sleeve to realize linear telescopic motion. By installing the first bearing and the second bearing at both ends of the rotor, the rotor will not move axially when it rotates. As the rotor rotates through the center lead screw, it transmits torque to the lead nut, converting it into thrust. This interaction of forces propels the lead nut axially, thereby achieving linear motion for the sleeve. Furthermore, integrating the center lead screw of the rolling lead screw with the rotor effectively shortens the length of the integrated center lead screw and rotor. The lead nut can be machined independently, simplifying manufacturing and processes, improving production efficiency, and further reducing costs and installation space.

[0047] The above description is only an embodiment of the present invention. It should be pointed out that those skilled in the art can make improvements without departing from the creative concept of the present invention, but these improvements all fall within the scope of protection of the present invention.

Claims

1. A linear drive mechanism, comprising a housing, a front cover and a rear cover respectively fixed to opposite ends of the housing, a stator disposed within the housing, and a rotor disposed within the stator, the stator driving the rotor to rotate; characterized in that, The housing includes a first housing and a second housing that are fixedly connected to each other. One end of the first housing away from the second housing is fixed to the front cover, and one end of the second housing away from the first housing is fixed to the rear cover. The linear drive mechanism further includes a rolling screw fixed to one end of the rotor away from the rear cover, a first bearing sleeved and fixed to one end of the rotor and fixed inside the second housing, and a second bearing sleeved and fixed to the other end of the rotor and fixed to the rear cover. The rolling screw includes a sleeve disposed inside the first housing and passing through the front cover, a screw nut fixed inside the sleeve near the rear cover end, and a central screw disposed inside the screw nut and extending along the axial direction of the screw nut. The outer peripheral side of the sleeve forms a sliding connection with the inner side of the first housing. The screw nut is sleeved on the central screw and forms a rotational connection with the central screw. The connection between the end of the central screw near the rear cover and the rotor is an integrally formed structure. The rotor rotates to drive the central screw to rotate, so that the screw nut rotates to drive the sleeve to achieve linear telescopic movement.

2. The linear drive mechanism according to claim 1, wherein, The rolling screw is a planetary roller screw. The screw nut includes a first nut body having a thread structure, a first annular installation groove and a second annular installation groove respectively recessed from both ends of the inner wall of the first nut body, a first gear ring fixedly disposed in the first installation groove, a second gear ring fixedly disposed in the second installation groove, and a plurality of annular screw columns disposed around the central screw. Both ends of each annular screw column are respectively disposed in the first gear ring and the second gear ring and form a rotational connection. The first nut body is fixed inside the sleeve. The central screw includes a first central screw body disposed inside the first nut body and having a thread structure. The first central screw body meshes with each of the annular screw columns, and each annular screw column meshes with the first nut body.

3. The linear drive mechanism according to claim 1, characterized in that, The rolling screw is a ball screw. The screw nut includes a second nut body, a first ball groove recessed in the inner peripheral side of the second nut body in a thread shape, and a plurality of balls disposed in the first ball groove. The second nut body is fixedly disposed inside the sleeve. The central screw includes a second central screw body disposed inside the second nut body and a second ball groove recessed in the outer periphery of the second central screw body in a thread shape. The first ball groove and the second ball groove are correspondingly disposed, and the balls are all clamped between the first ball groove and the second ball groove so that the second central screw body forms a rolling connection with the second nut body.

4. The linear drive mechanism according to claim 1, wherein The linear drive mechanism further includes a locking nut. The locking nut is sleeved and fixed to one end of the rotor away from the rear cover, and the locking nut abuts against one side of the first bearing away from the rear cover.

5. The linear drive mechanism according to claim 1, characterized in that, The linear drive mechanism further includes a first end rod bearing and a second end rod bearing; the first end rod bearing is fixed to one end of the sleeve away from the rear cover, and the second end rod bearing is fixed to the rear cover.

6. The linear drive mechanism according to claim 1, wherein The rotor includes a rotor body, a plurality of permanent magnets formed on the outer peripheral side of the rotor body, an annular bearing block protruding and extending from the outer periphery of the rotor body, and a limiting groove formed by recessing one end of the outer periphery of the rotor body close to the rear cover; one end of the rotor body away from the rear cover is fixed to the central lead screw, each permanent magnet is arranged at an interval from the stator, the bearing block abuts against one side of the first bearing close to the rear cover, and the second bearing is sleeved and fixed in the limiting groove.

7. The linear drive mechanism according to claim 1, wherein The linear drive mechanism further includes a position sensor, the position sensor includes a collecting part fixed to the rear cover and a rotating part fixed to the rotor, and the collecting part and the rotating part are arranged at a relative interval.

8. The linear drive mechanism according to claim 1, characterized in that, The motor formed by the stator and the rotor together adopts an 8-pole 9-slot, 10-pole 12-slot structure, or 14-pole 12-slot structure, or 16-pole 12-slot structure.

9. The linear drive mechanism according to claim 7, wherein, The position sensor is a Hall position sensor, a magnetic encoding position sensor, or an optical encoding position sensor.

10. The linear drive mechanism according to claim 1, characterized in that, The linear drive mechanism further includes a base fixed in the second housing, and the second bearing is fixed in the base.

11. The linear drive mechanism according to claim 10, characterized in that, The base includes a base body fixed in the second housing and a base groove formed by recessing one end of the base body close to the front cover towards the end close to the rear cover; the second bearing is fixed in the base groove.

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