Linear drive, simulator actuator and simulation simulator

Abstract

The utility model provides linear drive arrangement, simulator actuating mechanism and simulation simulator. Linear drive arrangement includes cylinder body, drive mechanism, transmission mechanism, electric cylinder axle and elastic part. Drive mechanism is located in the cylinder body; Transmission mechanism includes transmission shaft and reverse type planetary roller screw pair, is worn in cylinder body and one end of transmission shaft and projects cylinder body, transmission shaft is equipped with first containing groove, reverse type planetary roller screw pair connects drive mechanism and transmission shaft; Electric cylinder axle part is set in first containing groove and one end is equipped with output shaft head, the other end is equipped with second containing groove, and output shaft head is at least partially exposed to transmission shaft; Elastic part is partially accommodated in second containing groove and one end is connected with the groove bottom of second containing groove, and the other end projects second containing groove and is connected with the groove bottom of first containing groove; Drive mechanism drives transmission shaft to move along the cylinder body axial direction through reverse type planetary roller screw pair; When transmission shaft moves towards the outside of cylinder body, transmission shaft extrudes elastic part until pushes the top electric cylinder axle to move towards the outside of cylinder body.

Description

Technical Field

[0001] This utility model relates to the field of linear drive device technology, and in particular to a linear drive device, a simulator actuator, and a simulation simulator. Background Technology

[0002] In related technologies, the G-force seat platform is a dynamic simulation device capable of simulating G-forces under various motion states such as acceleration and deceleration, and it has important applications in simulation simulators such as flight simulators, racing simulators, and virtual reality. To achieve realistic G-force simulation feedback, the G-force seat platform typically uses an electric cylinder as a linear drive device to propel the seat through multi-degree-of-freedom spatial motion. However, existing electric cylinders suffer from drawbacks such as high peak load and high continuous rated power, leading to mechanical structural damage and reduced performance and lifespan. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides a linear drive device, a simulator actuator, and a simulation simulator. An elastic element is provided between the drive shaft and the electric cylinder shaft of the linear drive device. This elastic element can buffer the load during the operation of the linear drive device through elastic deformation, thereby reducing the peak load on the linear drive device, which helps to reduce the continuous rated power of the linear drive device and improves its performance and service life.

[0004] To achieve the above objectives, in a first aspect, the present invention provides a linear drive device, comprising: Cylinder block; The drive mechanism is located inside the cylinder. The transmission mechanism includes a drive shaft and a reverse planetary roller screw pair. The drive shaft is movably inserted through the cylinder along the axial direction of the cylinder and one end extends out of the cylinder. The drive shaft is provided with a first receiving groove extending along the axial direction. The reverse planetary roller screw pair is drively connected between the drive mechanism and the other end of the drive shaft. An electric cylinder shaft is partially fitted into the first receiving groove. The first end of the electric cylinder shaft has an output shaft head, and the second end of the electric cylinder shaft has a second receiving groove. At least a portion of the output shaft head is exposed at the end of the drive shaft extending out of the cylinder body. An elastic element is partially housed in the second receiving groove, with a first end of the elastic element connected to the bottom of the second receiving groove and a second end of the elastic element extending out of the second receiving groove and connected to the bottom of the first receiving groove. The drive mechanism is used to drive the reverse planetary roller screw pair to move, and then drive the transmission shaft to move along the axial direction of the cylinder body through the reverse planetary roller screw pair; when the transmission shaft moves out of the cylinder body, the transmission shaft squeezes the elastic element until it pushes the electric cylinder shaft to move out of the cylinder body; when the transmission shaft moves into the cylinder body, the transmission shaft drives the electric cylinder shaft to move into the cylinder body, and the elastic element restores its deformation.

[0005] In one embodiment, the drive shaft includes a first bushing and a central shaft body; The first end of the first bushing extends out of the cylinder body and is provided with a stop structure extending circumferentially along the end of the first bushing. The side of the stop structure near the axis of the first bushing forms a through hole communicating with the inner cavity of the first bushing. The second end of the first bushing is an open port. The central shaft includes a first shaft segment and an annular protrusion. The first shaft segment is driven to the reverse planetary roller screw pair. The annular protrusion is connected to the outer peripheral wall of one end of the first shaft segment, and the annular protrusion can be detachably sealed to the second end of the first bushing. The space between the first bushing and the central shaft forms the first receiving groove. At least a portion of the output shaft head is exposed to the transmission shaft through the through hole. The portion of the electric cylinder shaft housed in the first receiving groove has a shoulder at one end adjacent to the through hole, and the shoulder abuts against the stop structure.

[0006] In one embodiment, the linear drive device further includes a buffer pad, which is disposed on the side of the annular protrusion facing away from the first shaft segment, and a first gap is left between the buffer pad and the second end of the electric cylinder shaft. When the drive shaft presses the elastic member until the second end of the electric cylinder shaft abuts the buffer pad, the drive shaft pushes the electric cylinder shaft to move out of the cylinder body.

[0007] In one embodiment, an annular receiving groove is formed on the inner peripheral wall of the second end of the first bushing, the edge of the buffer pad is received in the receiving groove, and the side of the buffer pad facing away from the annular protrusion abuts against the bottom of the receiving groove.

[0008] In one embodiment, the central shaft further includes a second shaft segment connected to the first shaft segment and located on the side of the annular protrusion opposite to the first shaft segment; The second shaft segment extends into the second receiving groove, and the elastic element is sleeved on the outside of the second shaft segment.

[0009] In one embodiment, the electric cylinder shaft includes a second bushing and an output shaft head connected to a first end of the second bushing, and the second accommodating groove is formed on the inner peripheral wall of the second end of the second bushing. The second shaft segment is movably inserted into the second bushing, and the axial length of the portion of the second shaft segment inserted into the second bushing is greater than the axial dimension of the second receiving groove along the second shaft segment. A second gap is left between the end of the second shaft segment away from the first shaft segment and the output shaft head. The axial dimension of the second gap along the second shaft segment is greater than a preset threshold. The preset threshold is the deformation of the elastic element when the transmission shaft starts to squeeze the elastic element until it pushes the electric cylinder shaft to move.

[0010] In one embodiment, the reverse planetary roller screw pair includes a nut, a screw, a pair of cages, and a plurality of rollers. The screw is fixedly sleeved on the other end of the drive shaft. The pair of cages are rotatably sleeved on both ends of the screw along its circumference. The plurality of rollers are spaced apart around the screw. The opposite ends of each roller are rotatably connected to the pair of cages. The nut is sleeved on the other end of the drive shaft and around the plurality of rollers. The nut is fixedly connected to the drive mechanism and is axially fixed relative to the cylinder. In this configuration, the middle portion of each roller is simultaneously engaged with both the nut and the lead screw. The drive mechanism is used to drive the nut to rotate, which in turn drives the plurality of rollers to rotate around the lead screw, and each roller rotates around its own axis. This, in turn, drives the lead screw and the plurality of rollers to move axially along the cylinder body, causing the lead screw to drive the transmission shaft to move axially along the cylinder body.

[0011] In one embodiment, each roller is provided with a first engagement portion on the outer peripheral wall at opposite ends in the axial direction, and the lead screw is provided with a second engagement portion at opposite ends in the axial direction. The first engagement portion and the corresponding second engagement portion adopt a helical tooth engagement structure. Wherein, the gears of the two first meshing parts located at both ends of the roller axis rotate in opposite directions; the second meshing part is a plurality of helical teeth disposed on the outer peripheral wall of the lead screw, or, the reverse planetary roller lead screw pair further includes a pair of helical gears fixedly sleeved at both ends of the lead screw axis, and the plurality of helical teeth of the helical gears constitute the second meshing part.

[0012] Secondly, this utility model provides a simulator actuator, including a seat and a linear drive device as described in any of the above embodiments, wherein the linear drive device is used to drive the seat to move.

[0013] Thirdly, this utility model provides a simulation simulator, including the simulator execution mechanism described above.

[0014] The linear drive device, simulator actuator, and simulation simulator provided in the embodiments of this utility model, by setting an elastic element between the transmission shaft and the electric cylinder shaft of the linear drive device, the elastic element can play a buffering role through elastic deformation during the operation of the linear drive device, thereby reducing the peak load of the linear drive device under the working load, which is beneficial to reducing the continuous rated power of the linear drive device and improving the performance and service life of the linear drive device.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is an axial sectional view of a linear drive device provided in one embodiment of the present invention.

[0018] Figure 2 yes Figure 1 The diagram shows a three-dimensional exploded view of a reverse planetary roller screw pair without the nut.

[0019] Figure 3 yes Figure 1 The image shows an axial sectional view of a reverse planetary roller screw pair without the nut.

[0020] Explanation of key figure labels: 1000 - Linear drive unit; 20 - Cylinder block; 21 - Cylinder barrel; 22 - First end cover; 23 - Second end cover; 24 - First mounting base; 25 - Second mounting base; 30 - Drive mechanism; 31 - Motor stator; 32 - Motor rotor; 40 - Transmission mechanism; 42 - Transmission shaft; 421 - First bushing; 4211 - First receiving groove; 4212 - Stop structure; 423 - Central shaft; 4231 - First shaft section; 4232 - Second shaft section; 4233 - Annular protrusion; 44 - Reverse planetary type Roller screw assembly; 441-Nut; 442-Screw; 443-Cage; 444-Roller; 4441-First meshing part; 445-Helical gear; 4452-Second meshing part; 50-Electric cylinder shaft; 51-Output shaft head; 511-Shoulder; 52-Second bushing; 522-Second receiving groove; 60-Elastic element; 70-Buffer pad; 81-First bearing; 82-Second bearing; 83-Third bearing; 84-Axial retaining ring; 85-First nut; 86-Second nut; 87-Third bushing. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0022] Please refer to the following: Figures 1 to 3 This utility model provides a linear drive device 1000, including a cylinder body 20, a drive mechanism 30, a transmission mechanism 40, an electric cylinder shaft 50, and an elastic element 60. Specifically, the drive mechanism 30 is disposed within the cylinder body 20; the transmission mechanism 40 includes a drive shaft 42 and a reverse planetary roller screw pair 44. The drive shaft 42 is movably disposed within the cylinder body 20 along the axial direction and one end extends out of the cylinder body 20. The drive shaft 42 has a first accommodating groove 4211 extending axially. The reverse planetary roller screw pair 44 is tractively connected between the drive mechanism 30 and the other end of the drive shaft 42; the electric cylinder shaft 50 is partially sleeved in the first accommodating groove 4211. The first end of the electric cylinder shaft 50 has an output shaft head 51, and the second end of the electric cylinder shaft 50 has a second accommodating groove 522. At least a portion of the output shaft head 51 is exposed at the end of the drive shaft 42 extending out of the cylinder body 20. Figure 1(shown at the left end); the elastic member 60 is partially housed in the second receiving groove 522, the first end of the elastic member 60 is connected to the bottom of the second receiving groove 522, and the second end of the elastic member 60 extends out of the second receiving groove 522 and is connected to the bottom of the first receiving groove 4211. It should be noted that, in the embodiments of this utility model, the drive mechanism 30 is used to drive the reverse planetary roller screw pair 44 to move, and then the reverse planetary roller screw pair 44 drives the transmission shaft 42 to move axially along the cylinder body 20. During the process of the reverse planetary roller screw pair 44 driving the transmission shaft 42 to move axially along the cylinder body 20, when the transmission shaft 42 moves outward from the cylinder body 20, the transmission shaft 42 compresses the elastic member 60 until it pushes the electric cylinder shaft 50 to move outward from the cylinder body 20; correspondingly, when the transmission shaft 42 moves inward from the cylinder body 20, the transmission shaft 42 drives the electric cylinder shaft 50 to move inward from the cylinder body 20, and the elastic member 60 recovers its deformation. The electric cylinder shaft 50 moves axially along the cylinder body 20 under the drive of the transmission shaft 42, thus realizing the corresponding linear drive function.

[0023] It is understood that in the linear drive device 1000 provided in the embodiments of this utility model, by providing the elastic element 60 between the transmission shaft 42 and the electric cylinder shaft 50, the elastic element 60 can play a buffering role through elastic deformation during the operation of the linear drive device 1000 (i.e., during the process of the electric cylinder shaft 50 realizing the linear drive function), thereby reducing the peak load of the working load borne by the linear drive device 1000, which is beneficial to reducing the continuous rated power of the linear drive device 1000 and improving the performance and service life of the linear drive device 1000.

[0024] The following will be combined with the appendix Figure 1 To be continued Figure 3 The following is a further detailed description of the specific structure of the linear drive device 1000 provided in one embodiment of the present invention.

[0025] like Figure 1 As shown, in one embodiment of this utility model, the cylinder body 20 includes a cylinder barrel 21, a first end cap 22, and a second end cap 23. The cylinder barrel 21 is a cylindrical body open at both ends, and the first end cap 22 is sealed to one end of the cylinder barrel 21 by means of threaded connection or welding, etc. Figure 1 (As shown on the left end), the second end cap 23 is sealed to the other end of the cylinder 21 by means of threaded connection or welding. Figure 1As shown on the right end), the cylinder 21, the first end cover 22, and the second end cover 23 form a receiving space, which is used to accommodate and install components such as the drive mechanism 30 and the transmission mechanism 40. The first end cover 22 has a through hole extending axially along the cylinder 20, which is used for the movable passage of the first bushing 421 of the transmission shaft 42. Optionally, in Figure 1 In the example, the cylinder body 20 further includes a first mounting seat 24 and a second mounting seat 25, which cooperate to rotatably mount the nut 441 of the reverse planetary roller screw pair 44 inside the cylinder body 20, as will be described in detail later.

[0026] like Figure 1 As shown, in one embodiment of this utility model, the drive mechanism 30 includes a motor stator 31 and a motor rotor 32. The motor stator 31 is press-fitted onto the inner circumferential wall of the cylinder 21. The cylinder 21 and the motor stator 31 are not limited to a key connection that restricts the rotational freedom of the motor stator 31, thereby achieving a fixed installation of the motor stator 31. The motor rotor 32 is disposed between the motor stator 31 and the nut 441 of the reverse planetary roller screw pair 44, and the motor rotor 32 is fixedly sleeved on the outer circumferential wall of the nut 441. The motor stator 31 can be a frameless torque motor stator winding, and the motor rotor 32 can be a permanent magnet. It is understood that, similar to the working principle of existing motors, the motor stator 31, when energized, drives the motor rotor 32 to rotate, thereby causing the nut 441 to rotate.

[0027] exist Figure 1In the illustrated embodiment, the reverse planetary roller screw assembly 44 includes a nut 441, a screw 442, a pair of cages 443, and a plurality of rollers 444. The screw 442 is fixedly sleeved on the other end of the drive shaft 42. The pair of cages 443 are rotatably sleeved on both axial ends of the screw 442. The plurality of rollers 444 are spaced apart around the screw 442 along its circumference. The opposite ends of each roller 444 are rotatably connected to the pair of cages 443. The nut 441 is sleeved on the other end of the drive shaft 42 and around the plurality of rollers 444. The nut 441 is fixedly connected to the drive mechanism 30 (specifically, to the aforementioned motor rotor 32), and the nut 441 is axially fixed relative to the cylinder 20. In this configuration, the middle portion of each roller 444 is simultaneously engaged with both the nut 441 and the lead screw 442. The drive mechanism 30 drives the nut 441 to rotate, i.e., the motor rotor 32 drives the nut 441 to rotate. The nut 441 drives the plurality of rollers 444 to rotate around the lead screw 442, and each roller 444 rotates around its own axis. This, in turn, drives the lead screw 442 and the plurality of rollers 444 to move axially along the cylinder body 20, causing the lead screw 442 to drive the transmission shaft 42 to move axially along the cylinder body 20. It should be noted that the other end of the transmission shaft 42 is the end of the transmission shaft 42 located inside the cylinder body 20, i.e., the end away from the output shaft head 51 of the electric cylinder shaft 50. Specifically, the lead screw 442 is fixedly sleeved on the first shaft segment 4231 of the central shaft body 423 of the transmission shaft 42, as will be described later. It is understood that the structure and working principle of the reverse planetary roller screw pair 44 in this embodiment of the present invention are largely the same as those of existing reverse planetary roller screws, and will not be described in detail here. Figure 1 As shown, in this embodiment, the various components of the drive mechanism 30, the reverse planetary roller screw pair 44, and the transmission shaft 42 are interlocked and highly integrated, which helps to reduce the size and weight of the linear drive device 1000.

[0028] Among them, Figure 1 In the example, the first end of the nut 441 ( Figure 1 The left end shown is fitted with a first bearing 81, which is press-fitted into the cylinder 21. The opposite sides of the first bearing 81 are axially positioned by a second nut 86 and a stop step within the cylinder 21. The second end of the nut 441 (… Figure 1The nut 441 (shown on the right end) is detachably connected to the second mounting base 25 via a threaded connection or other means. The side of the second mounting base 25 facing away from the nut 441 is rotatably connected to the first mounting base 24 via a second bearing 82. The first mounting base 24 is clamped and fixed between the cylinder 21 and the second end cap 23. Thus, the opposite ends of the nut 441 are rotatably mounted in the cylinder 20 via a bearing. Of course, in other embodiments of this utility model, the nut 441 can also be rotatably disposed in the cylinder 20 in other ways, such as, but not limited to, the second end of the nut 441 being rotatably disposed in the cylinder 21 directly via the second bearing 82 pressed into the cylinder 20. This is not limited or elaborated upon.

[0029] Preferably, please refer to the following: Figure 2 and Figure 3 In one embodiment of the present invention, each roller 444 is provided with a first meshing portion 4441 on the outer peripheral wall at opposite ends in the axial direction, and the lead screw 442 is provided with a second meshing portion 4452 at opposite ends in the axial direction. The first meshing portion 4441 and the corresponding second meshing portion 4452 adopt a helical tooth meshing structure, wherein the gears of the two first meshing portions 4441 located at opposite ends in the axial direction of the roller 444 are rotated in opposite directions. In this embodiment, each roller 444 and the lead screw 442 achieve multi-point meshing at the middle and both ends, which not only improves the load-bearing capacity and helps extend the service life, but also ensures that the axial ends of each roller 444 rotate at the same speed around the lead screw 442 through the smooth characteristics of the gear meshing transmission at both ends, ensuring that the roller 444 will not deviate and avoid jamming during rotation. Furthermore, the gears of the helical gear meshing structure at both ends of the roller 444 and the lead screw 442 rotate in opposite directions, which can counteract the axial force generated by the helical gear meshing, thereby not generating additional load on other structures.

[0030] exist Figure 2 and Figure 3 In the example, the reverse planetary roller screw pair 44 further includes a pair of helical gears 445 fixedly sleeved at both axial ends of the screw 442, the plurality of helical teeth of the helical gears 445 constituting the second meshing part 4452. By fixing the helical gears 445 to the outer peripheral wall of the screw 442, the helical gears 445 and the rollers 444 can achieve helical tooth meshing at both axial ends, which can reduce the manufacturing difficulty of the screw 442. Of course, in other embodiments of this utility model, the second meshing part 4452 may also be a plurality of helical teeth directly disposed on the outer peripheral wall of the screw 442, and there is no limitation thereto.

[0031] It should be noted that, in Figure 2and Figure 3 In the example, the helical gear 445 is not limited to being fixedly sleeved on the outer peripheral wall of the lead screw 442 by an interference fit, and the lead screw 442 is provided with a corresponding stop step to facilitate quickly sleeved the helical gear 445 on the appropriate position of the lead screw 442; the pair of retainers 443 are respectively rotatably sleeved on the outer peripheral wall of the lead screw 442 by a third bearing 83, and each third bearing 83 can be axially positioned by the cooperation of the retainer 443 and the axial retaining ring 84. The retainer 443 is rotatably sleeved on the lead screw 442 by the third bearing 83. This can be implemented using existing technology, which will not be elaborated here.

[0032] Furthermore, in Figure 1 In the example, the drive shaft 42 specifically includes a first bushing 421 and a central shaft 423. The first end of the first bushing 421 ( Figure 1 The left end shown extends out of the cylinder body 20 and has a stop structure 4212 extending circumferentially along the first bushing 421 at its end. The side of the stop structure 4212 near the axis of the first bushing 421 forms a through hole communicating with the inner cavity of the first bushing 421. The second end of the first bushing 421 (shown as left end) Figure 1 The right end shown is an open port. The central shaft 423 includes a first shaft segment 4231 and an annular protrusion 4233. The first shaft segment 4231 is drivenly connected to the reverse planetary roller screw pair 44 (specifically, connected to the aforementioned screw 442). The annular protrusion 4233 is connected to the outer peripheral wall of one end of the first shaft segment 4231, and the annular protrusion 4233 can be detachably sealed to the second end of the first bushing 421. Thus, the space between the first bushing 421 and the central shaft 423 forms the first receiving groove 4211. At least a portion of the output shaft head 51 is exposed through the through hole to the drive shaft 42 (specifically, to the first end of the first bushing 421). The portion of the electric cylinder shaft 50 housed in the first receiving groove 4211 has a shoulder 511 at one end adjacent to the through hole. The shoulder 511 abuts against the stop structure 4212, so that when the drive shaft 42 moves into the cylinder body 20, it can drive the electric cylinder shaft 50 to move into the cylinder body 20 together. In this embodiment, the drive shaft 42 adopts a split structure, which is detachably connected by the first bushing 421 and the central shaft 423, making the processing structure of the drive shaft 42 simple and reducing the manufacturing difficulty.

[0033] Preferably, in Figure 1In the example, an elastic third bushing 87 is provided between the first bushing 421 and the first end cap 22. The third bushing 87 can support and guide the reciprocating movement of the first bushing 421, which is beneficial to improving the smoothness of the movement of the transmission shaft 42. The third bushing 87 is preferably made of wear-resistant material.

[0034] Among them, Figure 1 In the example, the lead screw 442 is sleeved on the outer peripheral wall of the first shaft segment 4231, and one axial side of the lead screw 442 abuts against the annular protrusion 4233. The end of the first shaft segment 4231 extends out of the lead screw 442 and is screwed with a first nut 85. The first nut 85 abuts against the other axial side of the lead screw 442, thereby achieving axial fixation of the lead screw 442. Of course, in other embodiments of this utility model, the lead screw 442 can also be fixedly sleeved on the first shaft segment 4231 in other ways, such as, but not limited to, the other axial side of the lead screw 442 can be directly fixed axially by a snap ring or an axial retaining ring. This is not limited or elaborated.

[0035] Preferably, in Figure 1 In the example, the linear drive device 1000 further includes a buffer pad 70, which is disposed on the side of the annular protrusion 4233 facing away from the first shaft segment 4231. The buffer pad 70 is connected to the second end of the electric cylinder shaft 50. Figure 1 A first gap is left between the right end shown. When the drive shaft 42 compresses the elastic member 60 until the second end of the electric cylinder shaft 50 abuts against the buffer pad 70, the drive shaft 42 can push the electric cylinder shaft 50 outward from the cylinder body 20. In this embodiment, by adding the buffer pad 70, direct hard contact between the electric cylinder shaft 50 and the drive shaft 42 can be avoided, which helps protect the electric cylinder shaft 50 and the drive shaft 42 and extends their service life. The buffer pad 70 can be, but is not limited to, a rubber ring. It can be understood that in this embodiment, the first gap is the axial dimension of the drive shaft 42, that is, the elastic deformation of the elastic member 60 throughout the entire process from when the drive shaft 42 begins to compress the elastic member 60 until it pushes the electric cylinder shaft 50.

[0036] Preferably, in Figure 1In the example, an annular receiving groove is formed on the inner peripheral wall of the second end of the first bushing 421. The edge of the buffer pad 70 is received in the receiving groove, and the side of the buffer pad 70 facing away from the annular protrusion 4233 abuts against the bottom of the receiving groove. In this way, the two sides of the buffer pad 70 are respectively limited by the annular protrusion 4233 and the bottom of the receiving groove, so that the buffer pad 70 is sandwiched between the annular protrusion 4233 and the bottom of the receiving groove, which can prevent the buffer pad 70 from moving and ensure that the electric cylinder shaft 50 and the transmission shaft 42 will not make hard contact.

[0037] Furthermore, in Figure 1 In the example, the central shaft 423 further includes a second shaft segment 4232, which is connected to the first shaft segment 4231 and located on the side of the annular protrusion 4233 opposite to the first shaft segment 4231. The second shaft segment 4232 partially extends into the second receiving groove 522, allowing the elastic member 60 to be fitted onto the outside of the second shaft segment 4232. In this embodiment, by setting the elastic member 60 to be fitted onto the outside of the second shaft segment 4232, the second shaft segment 4232 can limit the elastic member 60, preventing it from shifting during deformation and ensuring a stable buffering effect.

[0038] Please refer to it again. Figure 1 In one embodiment of this utility model, the electric cylinder shaft 50 specifically includes a second bushing 52 and the aforementioned output shaft head 51, wherein the output shaft head 51 is connected to the first end of the second bushing 52. Figure 1 (shown at the left end), the second end of the second bushing 52 ( Figure 1The inner peripheral wall of the right end (shown) is provided with the second receiving groove 522. The second shaft segment 4232 of the central shaft body 423 is movably extended into the second bushing 52, and the axial length of the part of the second shaft segment 4232 extending into the second bushing 52 is greater than the axial dimension of the second receiving groove 522 along the second shaft segment 4232. A second gap is left between the end of the second shaft segment 4232 away from the first shaft segment 4231 and the output shaft head 51. The axial dimension of the second gap along the second shaft segment 4232 is greater than a preset threshold. The preset threshold is the aforementioned first gap, which is the deformation of the elastic element 60 when the transmission shaft 42 starts to squeeze the elastic element 60 until it pushes the electric cylinder shaft 50 to move. In this embodiment, similar to the drive shaft 42, the electric cylinder shaft 50 also adopts a split structure, consisting of a second bushing 52 and an output shaft head 51 that are detachably connected. This design is simple to manufacture. Furthermore, the second shaft segment 4232 extends into the second bushing 52, providing support and guidance for the electric cylinder shaft 50, which helps improve its motion stability. The output shaft head 51 and the second bushing 52 can be detachably connected, but are not limited to, via threaded connections.

[0039] It is understood that, in the embodiments of this utility model, similar to existing electric cylinders, the linear drive device 1000 also includes other components, such as, but not limited to, wires for connecting an external power source to energize the motor stator 31, magnetic encoder plates for detecting the rotation angle and speed of the motor rotor 32, etc., which will not be elaborated upon.

[0040] In summary, the linear drive device 1000 provided in the embodiments of this utility model, by providing the elastic element 60 between the transmission shaft 42 and the electric cylinder shaft 50, can play a buffering role during the operation of the linear drive device 1000, thereby reducing the peak load of the linear drive device 1000 under working load, which is beneficial to reducing the continuous rated power of the linear drive device 1000 and improving its performance and service life. Furthermore, the various components of the linear drive device 1000 are interlocked and highly integrated, which helps to reduce the size and weight of the linear drive device 1000. In addition, the transmission shaft 42 and the electric cylinder shaft 50 and other components adopt a split structure, which is convenient for manufacturing, disassembly and maintenance.

[0041] Furthermore, embodiments of this utility model also provide a simulator actuator, including a seat and a linear drive device 1000, wherein the linear drive device 1000 is used to drive the seat to move, so as to achieve at least one degree of freedom of movement. The linear drive device 1000 can be the linear drive device 1000 in any of the above embodiments, thus possessing all the beneficial effects of the above embodiments, which will not be elaborated further.

[0042] It should be noted that the simulator actuator provided in the embodiments of this utility model also includes components such as a seat platform frame, a display system, and a control system, which will not be described in detail.

[0043] Furthermore, embodiments of this utility model also provide a simulation simulator, including the simulator actuator described above, thus possessing all the beneficial effects of the above embodiments, which will not be repeated here. The simulation simulator may be, but is not limited to, a car driving simulator, a flight driving simulator, or a virtual reality simulator; no limitation is made thereto.

[0044] In the description of this utility model, the terms "embodiment," "specific embodiment," "example," 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.

[0045] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A linear drive device, characterized in that, include: Cylinder block; The drive mechanism is located inside the cylinder. The transmission mechanism includes a drive shaft and a reverse planetary roller screw pair. The drive shaft is movably inserted through the cylinder along the axial direction of the cylinder and one end extends out of the cylinder. The drive shaft is provided with a first receiving groove extending along the axial direction. The reverse planetary roller screw pair is drively connected between the drive mechanism and the other end of the drive shaft. An electric cylinder shaft is partially fitted into the first receiving groove. The first end of the electric cylinder shaft has an output shaft head, and the second end of the electric cylinder shaft has a second receiving groove. At least a portion of the output shaft head is exposed at the end of the drive shaft extending out of the cylinder body. An elastic element is partially housed in the second receiving groove, with a first end of the elastic element connected to the bottom of the second receiving groove and a second end of the elastic element extending out of the second receiving groove and connected to the bottom of the first receiving groove. The drive mechanism is used to drive the reverse planetary roller screw pair to move, and then drive the transmission shaft to move along the axial direction of the cylinder body through the reverse planetary roller screw pair; when the transmission shaft moves out of the cylinder body, the transmission shaft squeezes the elastic element until it pushes the electric cylinder shaft to move out of the cylinder body; when the transmission shaft moves into the cylinder body, the transmission shaft drives the electric cylinder shaft to move into the cylinder body, and the elastic element restores its deformation.

2. The linear drive device as described in claim 1, characterized in that, The drive shaft includes a first bushing and a central shaft body; The first end of the first bushing extends out of the cylinder body and is provided with a stop structure extending circumferentially along the end of the first bushing. The side of the stop structure near the axis of the first bushing forms a through hole communicating with the inner cavity of the first bushing. The second end of the first bushing is an open port. The central shaft includes a first shaft segment and an annular protrusion. The first shaft segment is driven to the reverse planetary roller screw pair. The annular protrusion is connected to the outer peripheral wall of one end of the first shaft segment, and the annular protrusion can be detachably sealed to the second end of the first bushing. The space between the first bushing and the central shaft forms the first receiving groove. At least a portion of the output shaft head is exposed to the transmission shaft through the through hole. The portion of the electric cylinder shaft housed in the first receiving groove has a shoulder at one end adjacent to the through hole, and the shoulder abuts against the stop structure.

3. The linear drive device as described in claim 2, characterized in that, It also includes a buffer pad, which is disposed on the side of the annular protrusion facing away from the first shaft segment, and a first gap is left between the buffer pad and the second end of the electric cylinder shaft; When the drive shaft presses the elastic member until the second end of the electric cylinder shaft abuts the buffer pad, the drive shaft pushes the electric cylinder shaft to move out of the cylinder body.

4. The linear drive device as described in claim 3, characterized in that, The inner peripheral wall of the second end of the first bushing is provided with an annular receiving groove, the edge of the buffer pad is received in the receiving groove, and the side of the buffer pad facing away from the annular protrusion abuts against the bottom of the receiving groove.

5. The linear drive device according to any one of claims 2-4, characterized in that, The central shaft also includes a second shaft segment, which is connected to the first shaft segment and located on the side of the annular protrusion opposite to the first shaft segment; The second shaft segment extends into the second receiving groove, and the elastic element is sleeved on the outside of the second shaft segment.

6. The linear drive device as described in claim 5, characterized in that, The electric cylinder shaft includes a second bushing and an output shaft head connected to a first end of the second bushing. The second accommodating groove is provided on the inner peripheral wall of the second end of the second bushing. The second shaft segment is movably inserted into the second bushing, and the axial length of the portion of the second shaft segment inserted into the second bushing is greater than the axial dimension of the second receiving groove along the second shaft segment. A second gap is left between the end of the second shaft segment away from the first shaft segment and the output shaft head. The axial dimension of the second gap along the second shaft segment is greater than a preset threshold. The preset threshold is the deformation of the elastic element when the transmission shaft starts to squeeze the elastic element until it pushes the electric cylinder shaft to move.

7. The linear drive device as described in claim 1, characterized in that, The reverse planetary roller screw assembly includes a nut, a screw, a pair of cages, and multiple rollers. The screw is fixedly sleeved on the other end of the drive shaft. The pair of cages are rotatably sleeved on both ends of the screw along its axial direction. The multiple rollers are spaced apart around the screw along its circumference. The opposite ends of each roller are rotatably connected to the pair of cages. The nut is sleeved on the other end of the drive shaft and around the multiple rollers. The nut is fixedly connected to the drive mechanism and is axially fixed relative to the cylinder body. In this configuration, the middle portion of each roller is simultaneously engaged with both the nut and the lead screw. The drive mechanism is used to drive the nut to rotate, which in turn drives the plurality of rollers to rotate around the lead screw, and each roller rotates around its own axis. This, in turn, drives the lead screw and the plurality of rollers to move axially along the cylinder body, causing the lead screw to drive the transmission shaft to move axially along the cylinder body.

8. The linear drive device as described in claim 7, characterized in that, Each roller has a first meshing part on the outer peripheral wall at opposite ends in the axial direction, and the lead screw has a second meshing part at opposite ends in the axial direction. The first meshing part and the corresponding second meshing part adopt a helical tooth meshing structure. Wherein, the gears of the two first meshing parts located at both ends of the roller axis rotate in opposite directions; the second meshing part is a plurality of helical teeth disposed on the outer peripheral wall of the lead screw, or, the reverse planetary roller lead screw pair further includes a pair of helical gears fixedly sleeved at both ends of the lead screw axis, and the plurality of helical teeth of the helical gears constitute the second meshing part.

9. A simulator actuator, characterized in that, Includes a seat and a linear drive device as described in any one of claims 1-8, the linear drive device being used to drive the seat to move.

10. A simulation simulator, characterized in that, Includes the simulator actuator as described in claim 9.

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