Linear motion drive device and linear motion device

Abstract

This application relates particularly to the field of vehicles, and specifically discloses a linear motion drive device (1) comprising: a lead screw and nut mechanism (11) including a lead screw assembly (111) and a nut assembly (112); a driver (12) for driving the lead screw (1111) of the lead screw assembly (111) to rotate, thereby causing the nut (1121) of the nut assembly (112) to move linearly; and a buffer device (13) configured to drively couple the output end (121) of the driver (121) to the driven end (1112) of the lead screw (1111) in a manner that achieves motion buffering and noise reduction. A corresponding linear motion device is also disclosed. According to certain exemplary embodiments, it can significantly reduce operating noise, has a simple structure, and its modular design makes it easy to apply to different application scenarios.

Description

Technical Field

[0001] This application relates particularly to the field of new energy vehicles, and specifically to a linear motion drive device for vehicles and a corresponding linear motion device. Background Technology

[0002] This application addresses parallel moving components for automotive applications, such as refrigerator drawers and mobile armrest boxes. Currently, mainstream solutions include various structures like pulleys and cable rollers. However, these solutions are complex, involving numerous components, making modularization difficult. Often, implementing a solution for different vehicle models requires redesigning the layout and components to suit the specific needs of the enclosure. This results in long design cycles, increased investment each time, and prolonged verification periods. While some have proposed using lead screw and nut mechanisms, their inherent characteristics, including high operating noise, have limited adoption. Furthermore, existing lead screw and nut mechanisms lack modular design and cannot adequately adapt to the diverse needs of different enclosures.

[0003] Therefore, corresponding improvements are needed. Utility Model Content

[0004] Therefore, the purpose of this application is to provide an improved linear motion drive device and a corresponding linear motion device.

[0005] According to one aspect of this application, a linear motion drive device is provided, the linear motion drive device comprising: a lead screw and nut mechanism including a lead screw assembly and a nut assembly; a driver for driving the lead screw of the lead screw assembly to rotate, thereby causing the nut of the nut assembly to move linearly; and a buffer device configured to drively couple the output end to the driven end in a manner that achieves motion buffering and noise reduction between the output end of the driver and the driven end of the lead screw.

[0006] According to an optional embodiment of this application, the buffer device includes at least one first elastic element that is at least radially clamped between the output end and the driven end.

[0007] According to an optional embodiment of this application, the buffer device includes a torque path elastic element located on the torque transmission path from the output end to the driven end.

[0008] According to an optional embodiment of this application, one of the output end and the driven end includes a cylindrical structure for receiving the other of the output end and the driven end, and at least one groove for receiving the at least one first elastic element is provided on the radially inner side of the one of the output end and the driven end and / or the radially outer side of the other of the output end and the driven end.

[0009] According to an optional embodiment of this application, the first elastic element is configured as a sealing ring.

[0010] According to an optional embodiment of this application, the at least one first elastic element comprises two first elastic elements.

[0011] According to an optional embodiment of this application, the output terminal and the driven terminal are connected by a connection structure and rotate together.

[0012] According to an optional embodiment of this application, the two first elastic elements are located on opposite sides of the connecting structure.

[0013] According to an optional embodiment of this application, the connection structure includes a pin.

[0014] According to an optional embodiment of this application, the linear motion drive further includes a support assembly for holding the distal end of the lead screw opposite to the driven end.

[0015] According to an optional embodiment of this application, the support assembly includes a retaining bracket and at least one elastic component mounted on the retaining bracket to provide elastic support for the distal end.

[0016] According to an optional embodiment of this application, the at least one elastic component includes a radial elastic support component for providing radial elastic support to the distal end and / or an axial elastic support component for providing axial elastic support to the distal end toward the driven end.

[0017] According to an optional embodiment of this application, the radial elastic support assembly and / or the axial elastic support assembly are configured to allow adjustment of the sustaining torque of the lead screw in the drive de-energized state.

[0018] According to an optional embodiment of this application, the radially elastic support assembly includes a radially preloaded block acting radially on the outer periphery of the distal end and a radially elastic support element for pressing the radially preloaded block toward the outer periphery of the distal end.

[0019] According to an optional embodiment of this application, the axial elastic support assembly includes an axial preload block acting axially on the distal end face and an axial elastic support element for pressing the axial preload block toward the distal end face.

[0020] According to an optional embodiment of this application, the radial elastic support assembly further includes a limiting block that opposes the radial preload block and limits the radial elastic support element.

[0021] According to an optional embodiment of this application, the radial elastic support element is a helical spring.

[0022] According to an optional embodiment of this application, the axial elastic support element is a helical spring.

[0023] According to an optional embodiment of this application, the retaining bracket is formed with a blind hole for receiving the axial elastic support assembly and / or a through hole for receiving the radial elastic support assembly.

[0024] According to an optional embodiment of this application, the linear motion drive further includes a base and a fixing bracket for fixing the driver relative to the base, the fixing bracket being connected to the base.

[0025] According to an optional embodiment of this application, the linear motion drive device further includes a reinforcing bracket made of a material with greater strength than the fixed bracket, the reinforcing bracket being integrally formed with the fixed bracket.

[0026] According to an optional embodiment of this application, the housing of the driver is integrally formed with the mounting bracket.

[0027] According to an optional embodiment of this application, the reinforcing bracket is connected to the base.

[0028] According to an optional embodiment of this application, the reinforcing bracket is integrally formed with the base.

[0029] According to an optional embodiment of this application, the retaining bracket is integrally formed with the reinforcing bracket or is fixedly connected to the base as a separate component.

[0030] According to an optional embodiment of this application, the linear motion drive device further includes two slide rails for guiding the linear motion of an object to be driven by the nut assembly, the two slide rails being connected to the base on both sides respectively.

[0031] According to an alternative embodiment of this application, the nut assembly includes a nut that engages with the lead screw and a nut bracket for retaining the nut, the nut bracket being configured to allow for positional deviation compensation relative to the nut in at least a direction perpendicular to the lead screw.

[0032] According to an optional embodiment of this application, the nut assembly further includes an axial buffering device that at least allows axial buffering between the nut and the nut support.

[0033] According to an optional embodiment of this application, the nut bracket is integrally formed.

[0034] According to an optional embodiment of this application, the nut bracket is formed with an axial through hole through which the lead screw passes, and the axial buffer device is at least axially elastically clamped between the nut and the corresponding wall of the nut bracket defining the axial through hole.

[0035] According to an optional embodiment of this application, the axial buffer device is arranged at the outer peripheral edge of the end face of the nut.

[0036] According to an optional embodiment of this application, the axial buffer device is symmetrically arranged on both radial sides of the nut.

[0037] According to an optional embodiment of this application, the axial buffer device includes two elastic rings, which are respectively arranged at the two end faces of the nut.

[0038] According to an optional embodiment of this application, the axial buffer device includes two elastic rings, which are respectively arranged on two radially symmetrical sides of the nut.

[0039] According to an optional embodiment of this application, the driver further includes a controller configured to enable the driver to perform at least one of anti-collision, anti-pinch, emergency shutdown, and soft start-stop.

[0040] According to another aspect of this application, a linear motion device is provided, the linear motion device comprising a linear motion drive device according to any of the above embodiments and an object driven by the linear motion drive device.

[0041] According to certain exemplary embodiments of this application, operating noise can be significantly reduced, the structure is simple, and the modular design makes it easy to apply to different application scenarios.

[0042] This application utilizes a lead screw and nut structure to achieve a simple and effective overall linear motion drive device. Furthermore, through modular design, the driver, fixed bracket, nut assembly, and bracket assembly are transformed into independent modules that can be freely combined in different implementation schemes. By adjusting the lead screw length and nut lead, it can be adapted to different scenarios.

[0043] Meanwhile, this implementation scheme effectively reduces vibration and noise during movement by using flexible connection between the driver and the lead screw, pre-tightening connection at the remote end, nut bracket freedom release hole and buffer device design of the nut assembly, etc., to achieve a super quiet effect and effectively enhance the user experience in various scenarios.

[0044] Further, the actuator integrates a controller directly. With the optional addition of a position sensor, it can accurately calculate the number of turns of the lead screw and the relative position and distance of the linear displacement based on the lead of the nut. This enables anti-collision and anti-pinch functions in various application scenarios, such as when a drawer is opened and hits a foreign object, or when it is closed and gets stuck. Alternatively, it can provide an emergency closing function when the drawer is quickly pushed shut. All of these can be achieved through the software of the controller within the actuator. Attached Figure Description

[0045] The principles, features, and advantages of this application will be better understood below with reference to the accompanying drawings. In the drawings:

[0046] Figure 1 A perspective view of a linear motion drive device according to an exemplary embodiment of this application is shown.

[0047] Figure 2 It shows Figure 1 A top view of the linear motion drive device shown.

[0048] Figure 3 It shows along Figure 2 The sectional view is drawn using the section line AA.

[0049] Figure 4 It shows Figure 3 The magnified view of the area enclosed by the dashed circle in the image shows more structural details.

[0050] Figure 5 A perspective view of a nut assembly of a linear motion drive device according to an exemplary embodiment of this application is shown.

[0051] Figure 6 It shows Figure 5 The top view of the nut assembly shown.

[0052] Figure 7 It shows Figure 5The right view of the nut assembly shown.

[0053] Figure 8 A top view of a linear motion device according to an exemplary embodiment of this application is shown, which uses Figure 1 The linear motion drive device shown is used for driving.

[0054] Figure 9 It shows Figure 8 A cross-sectional view of the linear motion device shown. Detailed Implementation

[0055] To make the technical problems, technical solutions, and beneficial technical effects to be solved by this application clearer, the following will provide a more detailed description of this application in conjunction with the accompanying drawings and several exemplary embodiments. It should be understood that the specific embodiments described herein are only for explaining this application and not for limiting the scope of protection of this application. Various embodiments may share the same view for description, but not all features appearing in the same drawing should be interpreted as features that an embodiment must possess. Instead, they can be combined in any suitable manner as long as they are not technically mutually exclusive. Moreover, for the sake of brevity, different embodiments of different aspects may be presented in the same specific design; however, such presentation does not mean that embodiments of these aspects should appear together or exist simultaneously. Furthermore, due to limitations in drawing space, some reference numerals are not presented in all relevant drawings; multiple drawings can be used in conjunction when necessary for understanding. The disassembly and / or combination of all possible embodiments and / or technical features should also consider the description in the specification and the content that a person skilled in the art can directly and unambiguously determine based on the description in the specification.

[0056] Figure 1 A perspective view of a linear motion drive device 1 according to an exemplary embodiment of this application is shown.

[0057] Figure 2 It shows Figure 1 The top view of the linear motion drive device 1 shown.

[0058] Figure 3 It shows along Figure 2 The sectional view is drawn using the section line AA.

[0059] Figure 4 It shows Figure 3 The magnified view of the area enclosed by the dashed circle in the image shows more structural details.

[0060] Figure 5 A perspective view of a nut assembly 112 of a linear motion drive device 1 according to an exemplary embodiment of this application is shown.

[0061] Figure 6 It shows Figure 5 Top view of the nut assembly 112 shown.

[0062] Figure 7 It shows Figure 5 The right view of the nut assembly 112 shown.

[0063] Figure 8 A top view of a linear motion device 3 according to an exemplary embodiment of this application is shown, which uses Figure 1 The linear motion drive device 1 shown is used for driving.

[0064] Figure 9 It shows Figure 8 The cross-sectional view of the linear motion device 3 shown.

[0065] The collective presentation of these figures can give those skilled in the art a general understanding of the content involved in this application, which will be described in detail below.

[0066] Especially Figures 1-3 As shown, one aspect of this application provides a linear motion drive device 1, which includes: a lead screw and nut mechanism 11, which includes a lead screw assembly 111 and a nut assembly 112; a driver 12, such as a motor, for driving the lead screw 1111 of the lead screw assembly 111 to rotate, thereby causing the nut 1121 of the nut assembly 112 to move linearly; and a buffer device 13, which is configured to drively couple the output end 121 of the driver 12 to the driven end 1112 of the lead screw 1111 in a manner that achieves motion buffering and noise reduction.

[0067] The linear motion drive device 1 can be used to drive various objects that require linear motion, such as car refrigerator drawers, mobile armrest boxes, etc. "The buffer device 13 is configured to achieve motion buffering and noise reduction between the output end 121 of the driver 12 and the driven end 1112 of the lead screw 1111 by coupling the output end 121 with the driven end 1112" means that, even when the output end 121 and the driven end 1112 are coupled, there is still a corresponding buffer device 13 between the output end 121 and the driven end 1112 for buffering motion transmission and reducing noise.

[0068] This buffer device 13 can significantly reduce the operating noise of the linear motion drive device 1. Because the actual assembly of the output end 121 of the driver 12 and the driven end 1112 cannot guarantee absolute coaxiality, the buffer device 13 can effectively release the over-positioning of the rigid connection and the noise caused therefrom, while also mitigating the noise caused by the direct transmission of vibration from the driver 12 to the lead screw 1111. According to an exemplary embodiment of this application, particularly referring to… Figure 3 The buffer device 13 includes at least one first elastic element 131 that is at least radially clamped between the output end 121 and the driven end 1112.

[0069] According to an exemplary embodiment of this application, the buffer device 13 includes a torque path elastic element located on the torque transmission path from the output end 121 to the driven end 1112.

[0070] As can be seen, the buffer device 13 of this application differs from existing couplings. It does not use bearings, bushings, flanges, hubs, gear sleeves, or other complex structures. Its structure is relatively simple, its cost is low, and its installation is convenient. This is also an important point that distinguishes this application from existing couplings.

[0071] Those skilled in the art will understand that "at least radially clamped" does not exclude the axial clamping of a corresponding first elastic element and / or the same first elastic element being axially elastically clamped between the output end 121 and the driven end 1112, thus also having a buffering effect in the axial direction.

[0072] Continue reading Figure 3 According to an exemplary embodiment of this application, one of the output end 121 and the driven end 1112 includes a cylindrical structure 1211 for receiving the other of the output end 121 and the driven end 1112. At least one groove 1114 for receiving the at least one first elastic element 131 is provided on the radially inner side of said one of the output end 121 and the radially outer side of said one of the driven end 1112. Figure 3 Only one of the grooves is marked with a reference numeral in the attached drawing.

[0073] Specifically Figure 3 In the exemplary embodiment shown, the output end 121 includes a cylindrical structure 1211 for receiving the driven end 1112. The radially outer side (i.e., outer periphery) of the driven end 1112 is provided with two spaced-apart grooves 1114. Thus, according to an exemplary embodiment of this application, the at least one first elastic element 131 correspondingly includes two first elastic elements 131, which are respectively arranged in the respective grooves 1114.

[0074] According to an exemplary embodiment of this application, the first elastic element 131 may be configured as a sealing ring. This configuration is simple in structure and low in cost. In particular, the cushioning device 13 includes only such a sealing ring.

[0075] According to an exemplary embodiment of this application, the output terminal 121 and the driven terminal 1112 are connected by a connection structure 14 and rotate together.

[0076] According to an exemplary embodiment of this application, two first elastic elements 131 are respectively located on both axial sides of the connecting structure 14. Those skilled in the art will understand that the connecting structure 14 is for power transmission between the output end 121 and the driven end 1112, which differs from the buffer device 13; they are in a mating relationship, and the connecting structure 14 should not be interpreted as part of the buffer device 13.

[0077] According to an exemplary embodiment of this application, the connection structure 14 includes a pin. Of course, those skilled in the art will understand that the pin is merely an exemplary connection method, and any other suitable connection method can be used; this application does not impose any limitations on this.

[0078] Next, we will begin to describe the noise reduction and retention at the other end of the leadscrew 1111.

[0079] Especially Figure 3 and Figure 4 As shown, according to an exemplary embodiment of this application, the linear motion drive device 1 further includes a support assembly 15 for holding the distal end 1113 of the lead screw 1111 opposite to the driven end 1112. In particular, the support assembly 15 does not have an axially through hole, is not a bushing, and is not a bearing, as will become clearer in the following description.

[0080] According to an exemplary embodiment of this application, the support assembly 15 includes a retaining bracket 151 and at least one elastic component 152 mounted on the retaining bracket 151 to provide elastic support for the distal end 1113.

[0081] Continue reading Figure 4 According to an exemplary embodiment of this application, the at least one elastic component 152 includes a radial elastic support component 1521 for providing radial elastic support to the distal end 1113 and / or an axial elastic support component 1522 for providing axial elastic support to the distal end 1113 toward the driven end 1112.

[0082] Those skilled in the art will understand that the radial elastic support component 1521 and the axial elastic support component 1522 can exist separately or simultaneously.

[0083] According to an exemplary embodiment of this application, the radial elastic support assembly 1521 and / or the axial elastic support assembly 1522 are configured to allow the adjustment screw 1111 to maintain its torque when the drive 12 is de-energized. Of course, those skilled in the art will understand that the maintaining torque is also affected by friction at other locations, but these effects are either limited or relatively stable; therefore, in principle, it can be adjusted entirely by the radial elastic support assembly 1521 and / or the axial elastic support assembly 1522.

[0084] like Figure 4 As shown, according to an exemplary embodiment of this application, the radially elastic support assembly 1521 includes a radially preloaded block 1523 acting radially on the outer periphery of the distal end 1113 and a radially elastic support element 1524 for pressing the radially preloaded block 1523 toward the outer periphery of the distal end 1113. The preloaded block 1523 may have a shape that matches the outer periphery of the distal end 1113.

[0085] Similarly, according to an exemplary embodiment of this application, the axial elastic support assembly 1522 includes an axial preload block 1525 acting axially on the end face of the distal end 1113 and an axial elastic support element 1526 for pressing the axial preload block 1525 toward the end face of the distal end 1113.

[0086] Those skilled in the art will understand that, in addition to the adjustable holding torque (i.e., self-locking force) described above, the radial elastic support assembly 1521 can reduce radial wobble noise at the distal end 1113 of the lead screw 1111 or compensate for axial dimensional changes or deviations.

[0087] like Figure 4 As shown, according to an exemplary embodiment of this application, the radial elastic support assembly 1521 further includes a limiting block 1527 that opposes the radial preload block 1523 (i.e., at the other end of the radial elastic support element 1524) and limits the radial elastic support element 1524. In the installed state, the limiting block 1527 can hold the radial elastic support element 1524 and the radial preload block 1523 in place.

[0088] According to an exemplary embodiment of this application, the radial elastic support element 1524 may be a helical spring. Similarly, the axial elastic support element 1526 may also be a helical spring.

[0089] In the case of a helical spring, the radial preload block 1523 may have a protruding structure extending into the cavity of the helical spring, and the helical spring may be tightly fitted onto the corresponding structure of the limiting block 1527. Similarly, the axial preload block 1525 may also have a corresponding structure extending into the cavity of the helical spring.

[0090] like Figure 4 As shown, according to an exemplary embodiment of this application, the radial preload block 1523 presses against the outer periphery of the distal end 1113 from bottom to top, that is, the radial elastic support assembly 1521 is arranged vertically throughout in the working state. Of course, this is merely exemplary and not limiting, and it is not typically configured below. Moreover, those skilled in the art will understand that there can be multiple sets of radial elastic support assemblies 1521, which are distributed circumferentially, especially uniformly.

[0091] You can also from Figure 4As can be seen from this embodiment, according to an exemplary embodiment of the present application, the retaining bracket 151 is formed with a blind hole 1511 for receiving an axial elastic support assembly 1522 and / or a through hole 1512 for receiving a radial elastic support assembly 1521. The blind hole 1511 and the through hole 1512 are arranged perpendicularly to each other and are spatially connected.

[0092] Furthermore, according to an exemplary embodiment of this application, the limiting block 1527 may be provided with external threads and screwed into the through hole 1512. This facilitates assembly and allows for adjustment of the compression state of the radial elastic support element 1524 as needed.

[0093] The following section will describe other structural details of the linear motion drive device 1.

[0094] Especially Figure 1 and Figure 2 As shown, according to an exemplary embodiment of this application, the linear motion drive device 1 further includes a base 16, such as a base plate, and a fixing bracket 17 for fixing the driver 12 relative to the base 16, the fixing bracket 17 being connected to the base 16. This means that the driver 12 is fixed to the base 16 by the fixing bracket 17. The base 16 may, for example, be injection molded from plastic.

[0095] The base 16 is generally elongated in the same direction as the lead screw 1111. Depending on the stroke required for the application, different lengths of the lead screw 1111 and base 16 can be selected or cut. This is part of the modular design concept of this application. The aforementioned nut assembly 112 (which will be described in more detail below), bracket assembly 15, and driver 12 can all be modularly designed, making it easy to assemble corresponding linear motion drive devices 1 according to different application scenarios.

[0096] To increase strength, such as Figure 2 As shown, according to an exemplary embodiment of this application, the linear motion drive device 1 further includes a reinforcing bracket 18 made of a material stronger than the fixed bracket 17, such as a metal material, which is integrally formed with the fixed bracket 17. In this case, the reinforcing bracket 18 is also connected to the base 16. Alternatively, the metal reinforcing bracket 18 can be directly integrated as part of the base 16, i.e., integrally formed, for example, by injection molding, to enhance the strength and rigidity of the base 16, thereby preventing deformation under stress during movement.

[0097] To reduce the number of parts, according to an exemplary embodiment of this application, the housing of the driver 12 is integrally formed with the mounting bracket 17.

[0098] like Figure 2As shown, according to an exemplary embodiment of this application, the reinforcing bracket 18 is centrally arranged on the base 16, that is, located at the longitudinal center of symmetry of the base 16. Of course, this is merely an example.

[0099] According to an exemplary embodiment of this application, the retainer 151 and the reinforcing retainer 18 are integrally formed.

[0100] However, as a simplified approach, the support 151 can be fixedly connected to the base 16 as a separate component. If there is no need to reinforce the support 18, different layout requirements can be accommodated by adjusting the length of the lead screw 1111 and replacing the base 16.

[0101] like Figure 3 As shown, according to an exemplary embodiment of this application, the reinforcing bracket 18 is at least partially exposed from the bottom side of the base 16. Of course, this is merely an example.

[0102] According to an exemplary embodiment of this application, the linear motion drive device 1 further includes an object 2 to be driven by the nut assembly 112 (see also...). Figure 8 and Figure 9 For example, two linearly moving slide rails 19 (see reference) such as car refrigerator drawers or mobile armrest boxes. Figure 1 and Figure 2 The two slide rails 19 are respectively connected to the base 16 on both sides.

[0103] Next, we will describe the nut assembly 112.

[0104] See Figure 5 , Figure 6 and Figure 7 And possibly in conjunction with other accompanying drawings, according to an exemplary embodiment of this application, the nut assembly 112 includes a nut 1121 engaging with a lead screw 1111 and a nut bracket 1122 for retaining the nut 1121, the nut bracket 1122 being configured to allow for positional deviation compensation relative to the nut 1121 in a direction perpendicular to the lead screw 1111. This means that there is a certain amount of space for movement between the nut bracket 1122 and the nut 1121 in a direction perpendicular to the lead screw 1111, or that there is non-rigid contact between them.

[0105] According to an exemplary embodiment of this application, the nut bracket 1122 is integrally formed. In particular, as shown in... Figure 5 , Figure 6 and Figure 7As shown, the nut bracket 1122 has a body 1125 in the middle position and two wings 1126 extending outward from the body 1125. The wings 1126 are provided with holes for connecting to the object 2. The lead screw 1111 passes through the body 1125. The body 1125 is generally rectangular and open at the top and bottom.

[0106] In the installed state, the nut bracket 1122 is fixedly connected to the object 2 (especially the bottom of the object 2), instead of the nut 1121 being directly fixedly connected to the object 2.

[0107] This means that if there is a positional deviation in the direction perpendicular to the lead screw 1111 when the object 2 moves along the slide rail 19, a certain amount of movement can be released to avoid interference, jamming, or noise.

[0108] According to an exemplary embodiment of this application, the nut assembly 112 further includes an axial buffer device 1123 that at least allows axial buffering between the nut 1121 and the nut support 1122.

[0109] According to an exemplary embodiment of this application, the nut bracket 1122 (more specifically its body 1125) is formed with an axial through hole 1124 through which the lead screw 1111 passes, and the axial buffer device 1123 is elastically clamped at least axially between the nut 1121 and the corresponding wall of the nut bracket 1122 that defines the axial through hole 1124.

[0110] Especially refer to Figure 3 According to an exemplary embodiment of this application, the axial buffer device 1123 is arranged at the outer peripheral edge of the end face of the nut 1121. See also... Figure 3 According to an exemplary embodiment of this application, the axial buffer device 1123 includes two elastic rings, which are respectively arranged at the two end faces of the nut 1121. For those skilled in the art, the two elastic rings can also be arranged on both sides of the nut 1121 parallel to the lead screw 111, achieving a similar function and effect.

[0111] Therefore, according to an exemplary embodiment of this application, the axial buffer device 1123 is symmetrically arranged on both radial sides of the nut 1121. More specifically, the two elastic rings are respectively arranged on two radially symmetrical sides of the nut 1121.

[0112] To enable the linear motion drive 1 to have more functions, according to an exemplary embodiment of this application, the drive 12 further includes a controller (not specifically shown), which is configured to enable the drive 12 to perform at least one of anti-collision, anti-pinch, emergency shutdown, and soft start-stop. For this purpose, the linear motion drive 1 includes a position sensor (not shown) for connecting to the lead screw 1111, and the controller can accurately calculate the number of rotations of the lead screw 1111 and accordingly calculate the displacement of the nut 1121 based on the lead screw 1111's lead.

[0113] According to another aspect of this application, a linear motion device 3 is provided, such as a vehicle refrigerator drawer system or a mobile armrest box system, the linear motion device 3 including a linear motion drive device 1 according to any of the above exemplary embodiments and an object 2 driven by the linear motion drive device 1.

[0114] The aforementioned silent structural design results in extremely low noise during product operation, meeting the current requirements for quiet comfort in new energy vehicles. This is especially important for items such as the refrigerator armrest box, which are located very close to the driver and passenger area. The low noise significantly enhances the overall quality of the vehicle.

[0115] The product can be modularly designed to form Lego-like assembly modules. The same few modules can be adapted to different sports programs, reducing investment and shortening the verification and development cycle.

[0116] The driver 12 also integrates a controller, which can effectively integrate control strategies, such as anti-collision, anti-pinch, emergency shutdown, soft start-stop and other customized protection strategies.

[0117] Although this application has been described and illustrated with reference to specific embodiments herein, it is not limited to the details shown. Rather, various modifications to these details may be made within the scope of this application.

Claims

1. A linear motion drive device, characterized in that, The linear motion drive device (1) includes: A lead screw and nut mechanism (11) includes a lead screw assembly (111) and a nut assembly (112); A driver (12) for driving the lead screw (1111) of the lead screw assembly (111) to rotate, thereby causing the nut (1121) of the nut assembly (112) to move linearly; and A buffer device (13) is configured to drively couple the output end (121) and the driven end (1112) of the lead screw (1111) in such a way as to achieve motion buffering and noise reduction between the output end (121) of the driver (12) and the driven end (1112) of the lead screw (1111).

2. The linear motion drive device according to claim 1, characterized in that, The buffer device (13) includes at least one first elastic element (131) that is at least radially clamped between the output end (121) and the driven end (1112); and / or The buffer device (13) includes a torque path elastic element located on the torque transmission path from the output end (121) to the driven end (1112).

3. The linear motion drive device according to claim 2, characterized in that, One of the output end (121) and the driven end (1112) includes a cylindrical structure (1211) for receiving the other of the output end (121) and the driven end (1112), and at least one groove (1114) for receiving the at least one first elastic element (131) is provided on the radially inner side of the one of the output end (121) and the driven end (1112) and / or on the radially outer side of the other of the output end (121) and the driven end (1112); and / or The first elastic element (131) is configured as a sealing ring; and / or The at least one first elastic element (131) includes two first elastic elements (131).

4. The linear motion drive device according to claim 3, characterized in that, The output end (121) and the driven end (1112) are connected by a connecting structure (14) and rotate together.

5. The linear motion drive device according to claim 4, characterized in that, The two first elastic elements (131) are located on opposite sides of the axial direction of the connecting structure (14); and / or The connection structure (14) includes a pin.

6. The linear motion drive device according to any one of claims 1-5, characterized in that, The linear motion drive device (1) further includes a support assembly (15) for holding the distal end (1113) of the lead screw (1111) opposite to the driven end (1112).

7. The linear motion drive device according to claim 6, characterized in that, The support assembly (15) includes a retaining bracket (151) and at least one elastic component (152) mounted on the retaining bracket (151) to provide elastic support for the distal end (1113).

8. The linear motion drive device according to claim 7, characterized in that, The at least one elastic component (152) includes a radial elastic support component (1521) for providing radial elastic support to the distal end (1113) and / or an axial elastic support component (1522) for providing axial elastic support to the distal end (1113) toward the driven end (1112).

9. The linear motion drive device according to claim 8, characterized in that, The radial elastic support assembly (1521) and / or the axial elastic support assembly (1522) are configured to allow adjustment of the maintaining torque of the lead screw (1111) in the de-energized state of the drive (12).

10. The linear motion drive device according to claim 8, characterized in that, The radial elastic support assembly (1521) includes a radial preload block (1523) acting radially on the outer periphery of the distal end (1113) and a radial elastic support element (1524) for pressing the radial preload block (1523) toward the outer periphery of the distal end (1113); and / or The axial elastic support assembly (1522) includes an axial preload block (1525) acting axially on the end face of the distal end (1113) and an axial elastic support element (1526) for pressing the axial preload block (1525) toward the end face of the distal end (1113).

11. The linear motion drive device according to claim 10, characterized in that, The radial elastic support assembly (1521) further includes a limiting block (1527) that opposes the radial preload block (1523) and limits the radial elastic support element (1524); and / or The radial elastic support element (1524) is a helical spring; and / or The axial elastic support element (1526) is a helical spring.

12. The linear motion drive device according to any one of claims 8-11, characterized in that, The retaining bracket (151) is formed with a blind hole (1511) for receiving the axial elastic support assembly (1522) and / or a through hole (1512) for receiving the radial elastic support assembly (1521).

13. The linear motion drive device according to any one of claims 8-11, characterized in that, The linear motion drive device (1) further includes a base (16) and a fixing bracket (17) for fixing the driver (12) relative to the base (16), the fixing bracket (17) being connected to the base (16).

14. The linear motion drive device according to claim 13, characterized in that, The linear motion drive device (1) further includes a reinforcing bracket (18) made of a material stronger than the fixed bracket (17), the reinforcing bracket (18) being integrally formed with the fixed bracket (17); and / or The housing of the driver (12) is integrally formed with the fixed bracket (17).

15. The linear motion drive device according to claim 14, characterized in that, The reinforcing bracket (18) is connected to the base (16); and / or The reinforcing bracket (18) is integrally formed with the base (16); and / or The retaining bracket (151) is integrally formed with the reinforcing bracket (18) or is fixedly connected to the base (16) as a separate component.

16. The linear motion drive device according to claim 13, characterized in that, The linear motion drive device (1) further includes two slide rails (19) for guiding the linear motion of the object (2) to be driven by the nut assembly (112), the two slide rails (19) being connected to the base (16) on both sides respectively.

17. The linear motion drive device according to any one of claims 1-5, 8-11, and 14-16, characterized in that, The nut assembly (112) includes a nut (1121) that engages with the lead screw (1111) and a nut bracket (1122) for retaining the nut (1121), the nut bracket (1122) being configured to allow for positional deviation compensation relative to the nut (1121) in at least a direction perpendicular to the lead screw (1111).

18. The linear motion drive device according to claim 17, characterized in that, The nut assembly (112) further includes an axial buffer device (1123) that at least allows axial buffering between the nut (1121) and the nut bracket (1122); and / or The nut bracket (1122) is integrally formed.

19. The linear motion drive device according to claim 18, characterized in that, The nut bracket (1122) has an axial through hole (1124) through which the lead screw (1111) passes, and the axial buffer device (1123) is elastically clamped at least axially between the nut (1121) and the corresponding wall of the nut bracket (1122) defining the axial through hole (1124); and / or The axial buffer device (1123) is arranged at the outer peripheral edge of the end face of the nut (1121); and / or The axial buffer device (1123) is symmetrically arranged on both radial sides of the nut (1121); and / or The axial buffer device (1123) includes two elastic rings, which are respectively arranged at the two end faces of the nut (1121); and / or The axial buffer device (1123) includes two elastic rings, which are respectively arranged on two radially symmetrical sides of the nut (1121).

20. The linear motion drive device according to any one of claims 1-5, 8-11, 14-16, and 18-19, characterized in that, The driver (12) also includes a controller configured to enable the driver (12) to perform at least one of anti-collision, anti-pinch, emergency shutdown, and soft start-stop.

21. A linear motion device, characterized in that, The linear motion device (3) includes a linear motion drive device according to any one of claims 1-20 and an object (2) driven by the linear motion drive device (1).

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