Automobile seat rotating device with anti-backlash function and automobile seat thereof

Abstract

The utility model discloses an automobile seat rotating device with an anti-backlash function and an automobile seat thereof, and belongs to the technical field of automobile parts. Comprising a chassis; the rotating disc and the supporting disc correspond to each other up and down; the seat mounting disc is fixed with the rotary disc; the central tray is arranged in the turntable cavity; the fluted disc driving mechanism is fixed with the downward side of the central tray; the driving fluted disc is connected with the rotating disc and the supporting disc, and is characterized by further comprising an anti-backlash fluted disc and a group of fluted disc meshing pair attaching pre-tightening force applying mechanism, the anti-backlash fluted disc is stacked below the driving fluted disc, and the fluted disc driving mechanism and the driving fluted disc form a driving fluted disc meshing pair and also form an anti-backlash fluted disc meshing pair at the same time; the fluted disc meshing pair is attached to the pre-tightening force applying mechanism, arranged in the circumferential direction of the driving fluted disc at intervals and connected with the anti-backlash fluted disc. The method has the advantages that flexible anti-backlash capability and excellent dynamic adaptability are embodied, and strict use requirements of high-precision and high-dynamic intelligent automobiles are met; and the accurate and smooth effect is improved.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts technology, specifically relating to a car seat rotation device with gap elimination function, and also to a car seat. Background Technology

[0002] As is well known in the industry, gaps can cause uneven rotation and play in car seats, resulting in rattling noises or slight wobbling even after being locked in place. For example, even after a car seat is rotated into position and locked, a slight, uncomfortable, or even annoying wobbling or "clicking" sound may still occur when gently pushed by hand or moved slightly by the body. Therefore, the obvious advantages of eliminating tiny gaps between rotating parts include at least: improved stability and overall feel, enhanced comfort, reduced or even eliminated wear, and reduced adjustment effort, among others.

[0003] Publicly available Chinese patent documents contain technical information related to automotive seat rotating devices (also referred to as "turntables," hereinafter the same). A typical example is CN113525195A, "A Seat Turntable and an Automobile." This patent achieves gap elimination by using a gap elimination mechanism with two sliders that slide radially relative to an upper rotating disk, switching between an unlocked position and a gap-eliminating position. For example, when the circumferential locking mechanism releases the lock on the upper rotating disk, the two sliders switch to the unlocked position; when the upper rotating disk rotates to the locking position defined by the circumferential locking mechanism, the two sliders switch to the gap-eliminating position. This patent has a relatively simple mechanical structure and low cost (no additional motor) because it does not require complex control and relies on elastic elements to automatically compensate for gaps. However, it suffers from drawbacks such as the inability to dynamically adjust and the impact of elastic decay on performance after long-term use; long-term stress on the sliders or elastic components can lead to material fatigue; and the lack of motor-assisted control results in a slow dynamic response, making it unsuitable for applications requiring high precision or even stringent conditions (i.e., high-end vehicles).

[0004] For example, CN119369992A provides "a turntable stepless locking mechanism and method for eliminating gaps". This patent solution uses rigid locking and is suitable for preventing shaking after fixing the position. However, it has the following shortcomings: insufficient dynamic adjustment capability; weak elastic buffering capability; the gap elimination effect of the mechanical locking mechanism depends on the initial assembly accuracy, and the gap may reappear as the gears wear; low adjustment flexibility, and if the locking force needs to be adjusted, it needs to be adjusted manually or with tools; and the structure is complex.

[0005] Based on the existing technologies mentioned above, it is necessary to make reasonable improvements. The technical solution to be introduced below is generated in this context. Utility Model Content

[0006] The objective of this invention is to provide a car seat rotation device with a backlash elimination function that helps to meet the stringent requirements of high-precision and dynamic intelligent vehicles by demonstrating flexible backlash elimination capabilities and excellent dynamic adaptability, and helps to improve the precision and smoothness by avoiding looseness and swaying caused by play.

[0007] Another objective of this invention is to provide a car seat that fully embodies the technical effects of the car seat rotation device with gap-eliminating function.

[0008] The present invention achieves its objective as follows: a car seat rotating device with backlash elimination function, comprising a chassis having a chassis cavity; a turntable and a support plate that are vertically corresponding to and fixed to each other, the turntable and support plate forming a rotating pair with the cavity wall of the chassis cavity at positions corresponding to the chassis cavity; a seat mounting plate fixed to the turntable at a position above the turntable; a central tray disposed within the turntable cavity and fixed to the chassis by tray fixing seats spaced circumferentially around the central tray; a gear drive mechanism and a drive gear; the gear drive mechanism... The drive gear is fixed to the downward-facing side of the central tray and extends upward above the central tray to form a drive gear meshing pair with the drive gear. The drive gear is fixedly connected to the turntable and the support plate through spaced-apart drive gear feet. The feature is that it also includes a backlash-free gear and a set of gear meshing pair contact preload application mechanisms. The backlash-free gear is stacked below the drive gear and forms a backlash-free gear meshing pair with the backlash-free gear while the gear drive mechanism forms the drive gear meshing pair with the drive gear. The set of gear meshing pair contact preload application mechanisms is spaced around the circumference of the drive gear and connected to the backlash-free gear.

[0009] In a specific embodiment of this utility model, a bearing cavity is formed on the cavity wall of the chassis cavity and around the circumference of the cavity wall. A support bearing is provided in the bearing cavity. A turntable bearing support mating surface is formed on the outer wall of the turntable and around the circumference of the turntable. A support disk bearing support mating surface is formed on the outer wall of the support disk and around the circumference of the support disk. After the drive gear plate is fixedly connected to the turntable and the support disk, the turntable bearing support mating surface and the support disk bearing support mating surface together form a rotating pair with the support bearing in a state of vertical correspondence.

[0010] In another specific embodiment of this utility model, a turntable fixing edge is formed at the bottom of the turntable bearing support mating surface and around the bottom in the direction of the turntable cavity. A turntable fixing edge fixing hole is formed at intervals around the circumference of the turntable fixing edge. Support plate fixing holes corresponding to the turntable fixing edge fixing holes are formed at intervals around the circumference of the support plate. The end of the spaced-apart drive gear plate free-standing support foot facing the drive gear plate is fixed to the upward side of the drive gear plate by a free-standing support foot drive gear plate fixing screw, while the end facing the turntable fixing edge is fixed to the turntable and the support plate by a free-standing support foot turntable fixing screw at the position corresponding to the turntable fixing edge fixing hole and the support plate fixing hole. The shape of the drive gear plate free-standing support foot is a Z-shaped or zigzag structure forming a step.

[0011] In another specific embodiment of this utility model, a set of turntable fixing ears extends at equal intervals on the outer edge of the turntable, and a set of seat mounting plate fixing ears extends on the seat mounting plate at positions corresponding to the set of turntable fixing ears. Each of the set of seat mounting plate fixing ears has a seat mounting plate fixing ear hole. The seat mounting plate fixing ear and the turntable fixing ear are fixed by a seat mounting plate fixing ear screw passing through the turntable fixing ear hole and the seat mounting plate fixing ear hole in sequence from bottom to top.

[0012] In another specific embodiment of this utility model, a central tray fixing seat screw hole is provided at the edge of the central tray and at one end corresponding to the tray fixing seat in a paired manner. The central tray fixing screw is fixed to the tray fixing seat at the position corresponding to the central tray fixing seat screw hole and the tray fixing seat screw hole at the end of the tray fixing seat facing the central tray. A chassis screw hole is provided on the chassis and at the position corresponding to the end of the tray fixing seat away from the central tray. The chassis screw is fixed to the tray fixing seat at the position corresponding to the chassis screw hole and the tray fixing seat screw hole on the tray fixing seat. A tray fixing seat cavity is formed in the middle of the tray fixing seat. The tray fixing seat cavity is in a non-contact state with the support plate and corresponds to the lower part of the support plate.

[0013] In another specific embodiment of this utility model, a chassis mounting and fixing extension plate extends from the left and right sides of the chassis. Each chassis mounting and fixing extension plate has a chassis mounting and fixing bolt hole. In use, the chassis mounting and fixing extension plate is fixed to the vehicle floor or to a fixing frame set on the vehicle floor by bolts at the positions corresponding to the chassis mounting and fixing bolt holes.

[0014] In a further specific embodiment of this utility model, a left drive gear clearance hole and a right drive gear clearance hole are provided on the central tray. The left and right drive gear clearance holes are symmetrical to each other and maintain a distance between them. The gear drive mechanism includes a left motor, a left reduction gearbox, a left reduction gearbox mounting base, a right motor, a right reduction gearbox, a right reduction gearbox mounting base, a left drive gear, a right drive gear, and a gear shaft head limiting plate. The left motor is driven by the left reduction gearbox and is fixed to the downward-facing side of the left reduction gearbox mounting base along with the left reduction gearbox and the left reduction gearbox mounting base. The left reduction gearbox mounting base is fixed to the downward-facing side of the central tray by a set of left reduction gearbox mounting screws, and the center position of the left reduction gear mounting base corresponds to the left drive gear clearance hole. The right motor is driven by the right reduction gearbox and is fixed to the downward-facing side of the right reduction gear mounting base along with the right reduction gearbox and the right reduction gear mounting base. The right reduction gear mounting base is fixed to the downward-facing side of the central tray by a set of right reduction gearbox mounting screws, and the center position of the right reduction gear mounting base is aligned with the right drive gear clearance hole. Corresponding to the holes, the lower end of the left drive gear's lower shaft is connected to the left reduction gear shaft of the left reduction gearbox. The middle part of the left drive gear extends above the left drive gear clearance hole and simultaneously forms a meshing pair with the drive gear plate and the backlash-free gear plate. The lower end of the right drive gear's lower shaft is connected to the right reduction gear shaft of the right reduction gearbox. The middle part of the right drive gear extends above the right drive gear clearance hole and simultaneously forms a meshing pair with the drive gear plate and the backlash-free gear plate. The left end of the gear shaft head limiting plate is connected to the left shaft sleeve. The upper shaft head of the left drive gear is engaged with the upper shaft head of the right drive gear through the right bushing. The right end of the gear shaft head limiting plate is engaged with the upper shaft head of the right drive gear through the right bushing. A limiting plate fixing foot extends from the front and rear sides of the middle part of the gear shaft head limiting plate. The limiting plate fixing foot is fixed to the center tray by the limiting plate fixing foot fixing screw. A wire passage hole for the power supply line is opened at the center of the length direction of the gear shaft head limiting plate. The wire passage hole corresponds to the center tray wire clearance hole opened at the center of the center tray.

[0015] In a further specific embodiment of this utility model, the left motor and the right motor are servo motors or stepper motors with forward and reverse rotation functions, the left gearbox and the right gearbox are worm gear reducers, and the left gearbox shaft and the right gearbox shaft are worm gear shafts.

[0016] In yet another specific embodiment of this utility model, the set of gear meshing pair contact preload application mechanisms are arranged at equal intervals around the circumference of the drive gear. Each of the set of gear meshing pair contact preload application mechanisms includes a drive gear spring post, a backlash-free gear spring post sliding hole, a backlash-free gear spring post, and a preload application spring. The drive gear spring post is fixed to the upward-facing side of the drive gear. The backlash-free gear spring post sliding hole is opened on the drive gear at a position corresponding to the backlash-free gear spring post. The backlash-free gear spring post is fixed to the upward-facing side of the backlash-free gear and extends above the drive gear at a position corresponding to the backlash-free gear spring post sliding hole. One end of the preload application spring is hung on the drive gear spring post, and the other end is hung on the backlash-free gear spring post.

[0017] Another objective of this utility model is achieved by providing a car seat with a gap-eliminating rotating device.

[0018] The technical solution provided by this utility model, by adding a backlash-eliminating gear disc and a set of gear disc meshing pair preload application mechanisms, can reliably eliminate the backlash between the gear disc drive mechanism and the drive gear disc meshing pair. This demonstrates flexible backlash elimination capability and excellent dynamic adaptability, meeting the stringent requirements of high-precision and high-dynamic intelligent vehicles. It also helps to avoid looseness and wobbling caused by play, thus improving the precision and smoothness of the ride. The provided car seat fully embodies the aforementioned technical effects of the car seat rotation device with backlash elimination function. Attached Figure Description

[0019] Figure 1 This is an assembly structure diagram of the present invention;

[0020] Figure 2 for Figure 1 The diagram shows a support bearing installed in the bearing cavity of the chassis cavity.

[0021] Figure 3 for Figure 1 The diagram shows a detailed structure of the gear drive mechanism and a set of gear meshing pairs with preload application mechanism.

[0022] Figure 4 for Figure 1 A schematic diagram after assembly. Detailed Implementation

[0023] In order to better understand the technical essence and beneficial effects of this utility model, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the solution of this utility model. Any formal but not substantive equivalent transformations made based on the concept of this utility model should be considered within the scope of the technical solution of this utility model.

[0024] In the following description, all directional or positional concepts involving up, down, left, right, front, and back are based on the current position. Figure 1 The location and state are taken as a reference, and therefore should not be construed as a special limitation on the technical solution provided by this utility model.

[0025] Please see Figure 1 The diagram shows a circular chassis 1 with a chassis cavity 11 (i.e., a circular chassis cavity); a turntable 2 and a support plate 3 are shown, which are vertically aligned and fixed to each other. The turntable 2 and support plate 3 form a rotating pair with the cavity wall of the chassis cavity 11 at positions corresponding to the aforementioned chassis cavity 11 (to be described in more detail below); a seat mounting plate 4 is shown, which is fixed to the turntable 2 at a position above the aforementioned turntable 2; and a center tray 5 is shown, which is mounted on the turntable. The turntable cavity 21 of 2 is fixed to the aforementioned chassis 1 by tray fixing seats 51 spaced around the center tray 5 in the circumferential direction. The center tray 5 does not contact the cavity wall of the turntable cavity 21. A toothed drive mechanism 6 and a drive toothed disc 7 are shown. The toothed drive mechanism 6 is fixed to the downward-facing side of the center tray 5 and extends upward to the top of the center tray 5 to form a drive toothed disc meshing pair with the drive toothed disc 7. The drive toothed disc 7 is fixedly connected to the aforementioned turntable 2 and support plate 3 by spaced drive toothed disc free-standing feet 71.

[0026] The key technical points of the technical solution provided by this utility model are as follows: the aforementioned automotive seat rotation device with backlash elimination function further includes a backlash elimination gear 8 and a set of gear meshing pair contact pre-tightening force application mechanisms 9. The backlash elimination gear 8 is stacked below the drive gear 7 and forms a backlash elimination gear meshing pair with the aforementioned gear drive mechanism 6 and drive gear 7 at the same time as forming the aforementioned drive gear meshing pair. A set of gear meshing pair contact pre-tightening force application mechanisms 9 are arranged at intervals around the circumference of the aforementioned drive gear 7 and are connected to the aforementioned backlash elimination gear 8.

[0027] In this embodiment, as a preferred option, the inner diameters of the aforementioned drive gear disk 7 and backlash-free gear disk 8 are the same, and the number of teeth, tooth pitch, and tooth height of the drive gear disk teeth 72 constituting the inner gear ring of the drive gear disk 7 are the same as the number of teeth, tooth pitch, and tooth height of the backlash-free gear disk teeth 81 constituting the inner gear ring of the backlash-free gear disk 8. However, the outer diameter of the backlash-free gear disk 8 is smaller than the outer diameter of the drive gear disk 7.

[0028] Please see Figure 2 And combined Figure 1 A bearing cavity 111 is formed on the cavity wall of the chassis cavity 11 of the aforementioned chassis 1 in the circumferential direction. A support bearing 1111 is provided in the bearing cavity 111. A turntable bearing support mating surface 22 is formed on the outer wall of the aforementioned turntable 2 in the circumferential direction. A support disk bearing support mating surface 31 is formed on the outer wall of the aforementioned support disk 3 in the circumferential direction. After the aforementioned drive gear plate lifting support foot 71 is fixedly connected to the aforementioned turntable 2 and support disk 3, the aforementioned turntable bearing support mating surface 22 and support disk bearing support mating surface 31 form a rotating pair with the aforementioned support bearing 1111 in a state of corresponding vertical alignment.

[0029] As a non-limiting but relatively preferred approach, the aforementioned support bearing 1111 has a structure consisting of... Figure 2 As detailed, it consists of three bearing units 11111 and three arc-shaped limiting strips 11112. The three bearing units 11111 are arranged circumferentially around the bearing cavity 111 and spaced 120° apart with respect to the center of the chassis cavity 11. Adjacent bearing units 11111 are defined by the aforementioned arc-shaped limiting strips 1112. Figure 2 As shown, each bearing unit 11111 includes a horizontal roller 11113 located in the center and a pair (two) of longitudinal rollers 11114 located on both sides of the horizontal roller 11113. The aforementioned turntable bearing support mating surface 22 and the upper part of the longitudinal and horizontal rollers 11114 and 11113 facing the chassis cavity 11 form a rolling pair (also called a "rotational pair"). The support plate bearing support mating surface 31 and the lower part of the longitudinal and horizontal rollers 11114 and 11113 facing the chassis cavity 11 form a rolling pair (also called a "rotational pair"). As can be seen from the above description, the entire turntable 2 and support plate 3 rotate around the support bearing 1111.

[0030] See you later Figure 1A turntable fixing edge 23 is formed at the bottom of the aforementioned turntable bearing support mating surface 22 and around the bottom in the direction of the aforementioned turntable cavity 21. A turntable fixing edge fixing hole 231 is formed on the turntable fixing edge 23 and at intervals around the circumference of the turntable fixing edge. On the upper surface of the aforementioned support plate 3 and at intervals around the circumference of the support plate 3, support plate fixing holes 32 are formed at positions corresponding to the aforementioned turntable fixing edge fixing holes 231. The aforementioned spaced-apart drive gear plate free-standing support foot 71 is fixed to the drive gear plate 7 at one end facing the aforementioned drive gear plate 7 by a free-standing support foot drive gear plate fixing screw 711, and the other end facing the aforementioned turntable fixing edge 23 is fixed to the turntable 2 and support plate 3 at positions corresponding to the turntable fixing edge fixing hole 231 and support plate fixing hole 32 by a free-standing support foot turntable fixing screw 712. The aforementioned drive gear plate free-standing support foot 71 has a Z-shaped or zigzag structure forming a step, which can also be described as having a Z-shaped or zigzag shape.

[0031] A set of turntable fixing ears 24 (four in this embodiment) are evenly spaced along the outer edge of the aforementioned turntable 2. A set of seat mounting ears 41, equal in number and corresponding in position to the set of turntable fixing ears 24, are extended on the aforementioned seat mounting plate 4. Each of the set of seat mounting ears 41 has a seat mounting ear hole 411. The seat mounting ear 41 is fixed to the turntable fixing ears 241 and the seat mounting ear hole 411 by passing through the turntable fixing ear hole 241 and the seat mounting ear hole 411 in sequence from bottom to top.

[0032] A central tray mounting screw hole 52 is provided at the edge of the aforementioned central tray 5 and at one end corresponding to the aforementioned tray mounting base 51 in a paired manner. The central tray mounting screw 521 is fixed at the position corresponding to the central tray mounting screw hole 52 and the tray mounting screw hole 511 provided at the end of the tray mounting base 51 facing the central tray 5. On the aforementioned chassis 1, a chassis screw hole 12 is provided at the position corresponding to the end of the aforementioned tray mounting base 51 away from (i.e. away from) the central tray 5. The chassis screw 121 is fixed to the tray mounting base 51 at the position corresponding to the chassis screw hole 12 and the tray mounting screw hole 512 provided on the tray mounting base 51, and is further secured with a nut. The middle part of the tray mounting base 51 forms a tray mounting cavity 513. The tray mounting cavity 513 is located below the aforementioned support plate 3 in a non-contact state with the aforementioned support plate 3.

[0033] Depend on Figure 1As shown, a chassis mounting extension plate 13 extends from the left and right sides of the aforementioned chassis 1 at corresponding positions. Each chassis mounting extension plate 13 has a chassis mounting extension plate bolt hole 131. In use, the chassis mounting extension plate 13 is fixed to the vehicle floor or to a mounting bracket installed on the vehicle floor by bolts at the positions corresponding to the chassis mounting extension plate bolt holes 131.

[0034] Please see Figure 3 And combined Figure 1 and Figure 4A left drive gear clearance hole 53 and a right drive gear clearance hole 54 are provided on the aforementioned central tray 5. The left and right drive gear clearance holes 53 and 54 are symmetrical to each other and maintain a distance between them. The aforementioned gear drive mechanism 6 includes a left motor 61, a left reduction gearbox 62, a left reduction gearbox mounting base 63, a right motor 64, a right reduction gearbox 65, a right reduction gearbox mounting base 66, a left drive gear 67, a right drive gear 68, and a gear shaft head limiting plate 69. The left motor 61 is driven by the left reduction gearbox 62 and is fixed to the downward-facing side of the left reduction gearbox mounting base 63 along with the left motor 61. The left reduction gearbox mounting base 64... 3. The left gearbox mounting base 63 is fixed to the downward-facing side of the center tray 5 by a set of three left gearbox mounting screws 631, and the center position of the left gearbox mounting base 63 corresponds to the aforementioned left drive gear clearance hole 53. The right motor 64 is in transmission cooperation with the right gearbox 65, and the right gearbox 65 together with the right motor 64 is fixed to the downward-facing side of the right gearbox mounting base 66. The right gearbox mounting base 66 is fixed to the downward-facing side of the center tray 5 by a set of three right gearbox mounting screws 661, and the center position of the right gearbox mounting base 66 corresponds to the aforementioned right drive gear clearance hole 54. The lower end of the left drive gear 67 is the lower shaft of the left drive gear. The head is connected to the left gearbox shaft of the left gearbox 62. The middle part of the left drive gear 67 extends above the left drive gear clearance hole 53 and simultaneously forms a meshing pair with the aforementioned drive gear teeth 72 of the aforementioned drive gear disk 7 and the aforementioned backlash-free gear teeth 81 of the aforementioned backlash-free gear disk 8. The lower end of the right drive gear 68 is connected to the right gearbox shaft of the right gearbox 65. The middle part of the right drive gear 68 extends above the right drive gear clearance hole 54 and simultaneously forms a meshing pair with the aforementioned drive gear teeth 72 of the aforementioned drive gear disk 7 and the aforementioned backlash-free gear teeth 81 of the aforementioned backlash-free gear disk 8. The left end of the gear shaft head limiting plate 69 is connected to the left shaft sleeve 692. The gear shaft head 69 is engaged with the upper shaft head 671 of the left drive gear 67, and the right end of the gear shaft head limiting plate 69 is engaged with the upper shaft head 681 of the right drive gear 68 through the right shaft sleeve 693. A limiting plate fixing foot 691 extends from the front and rear sides of the middle part of the gear shaft head limiting plate 69. The limiting plate fixing foot 691 is fixed to the center tray 5 by the limiting plate fixing foot fixing screw 6911. A wire passage hole 694 for the passage of the power supply line is opened at the center position of the gear shaft head limiting plate 69 in the length direction. The wire passage hole 694 corresponds to the center tray line clearance hole 55 opened at the center position of the center tray 5.

[0035] In this embodiment, the aforementioned left motor 61 and right motor 64 are servo motors with forward and reverse rotation functions, but stepper motors can also be used. The aforementioned left gearbox 62 and right gearbox 65 are worm gear reducers, and the aforementioned left gearbox shaft and right gearbox shaft are worm gear shafts.

[0036] See you later Figure 1 and Figure 3 And combined Figure 4 The aforementioned set of gear meshing pair contact preload application mechanisms 9 (three in this embodiment) are arranged at equal intervals around the circumference of the aforementioned drive gear 7. Each of the gear meshing pair contact preload application mechanisms 9 includes a drive gear spring post 91, a backlash-free gear spring post sliding hole 92, a backlash-free gear spring post 93, and a preload application spring 94. The drive gear spring post 91 is fixed on the upward-facing side of the aforementioned drive gear 7. The backlash-free gear spring post sliding hole 92 is opened on the drive gear 7 at the position corresponding to the backlash-free gear spring post 93. The backlash-free gear spring post 93 is fixed on the upward-facing side of the aforementioned backlash-free gear 7 and extends above the drive gear 7 at the position corresponding to the backlash-free gear spring post sliding hole 92. One end of the preload application spring 94 is hung on the drive gear spring post 91, and the other end is hung on the backlash-free gear spring post 93.

[0037] This utility model also provides a car seat with the aforementioned gap-eliminating car seat rotation device.

[0038] Please see Figure 4 And combined Figures 1 to 3 The applicant describes the working principle of this utility model, as mentioned above: In use, the chassis 1 is fixed to the vehicle's floor or a bracket (also called a "frame") mounted on the floor of the vehicle through chassis mounting expansion plate bolt holes 131 opened on the chassis mounting expansion plate 13; the car seat is fixed to the seat mounting plate 4. Furthermore, based on the above description, it can be definitively determined that the chassis 1 and the center tray 5 are static, i.e., do not rotate, while the turntable 2, support plate 3, seat mounting plate 4, drive gear 7, and backlash-free gear 8 rotate. The left and right motors 61 and 64 of the aforementioned gear drive mechanism 6 are supported by the vehicle's power supply (electrically connected via wiring). The controller for controlling the gear drive mechanism 6 is located in a suitable position on the car seat. This "suitable position" is used because different vehicles have different installation locations; for example, some are located on the left side or side of the seat, while others are located on the front side, etc.

[0039] The car seat rotation device described in this utility model is a car seat turntable structure. Its core positive significance lies in breaking the limitation of the fixed orientation of traditional car seats, giving the interior space flexibility, convenience, and multi-functionality. It optimizes the experience of passengers getting in and out of the car, riding comfort, social interaction, etc., and expands the vehicle's usage potential in different scenarios. It is an important configuration factor for modern cars (such as MPVs and high-end SUVs) to enhance the user experience.

[0040] When the passenger needs to adjust the seat angle, they simply operate the corresponding button on the aforementioned controller, such as a touch button or similar operating element such as a knob or push switch, to make the left motor 61 and right motor 64 of the gear drive mechanism 6 work simultaneously in the same direction of rotation. Since the aforementioned left drive gear 67 and right drive gear 68 together form a meshing pair with the drive gear 72 of the aforementioned drive gear 7 and the backlash-free gear 81 of the aforementioned backlash-free gear 8, the left and right drive gears 67 and 68 drive the drive gear 7 and the backlash-free gear 8 to rotate. Since the drive gear 2 is fixedly connected to the turntable 2 and the support plate 3 through a set of drive gear 2 free-standing support feet 71, and since the seat mounting plate 4 is fixedly connected to the turntable 2, when the drive gear 7 rotates, the turntable 2, the support plate 3, and the seat mounting plate 4, along with the car seat fixed to them, rotate accordingly. When the angle is reached to the passenger's desired angle, the operation of the controller is released, thereby allowing the car seat to rotate to the required angle position along with the seat mounting plate 4. Based on professional knowledge, and as mentioned above, the left and right motors 61 and 64 are servo motors or stepper motors with forward and reverse rotation functions, and the aforementioned left and right gearboxes 62 and 65 are worm gear and screw gearboxes. The transmission relationship between the left and right motors 61 and 64, the gearboxes 62 and 65, and the left and right drive gears 67 and 68 is prior art, for example, see Chinese patent CN111942237A. Based on this, the applicant will not elaborate further.

[0041] During the aforementioned operation, there is an unavoidable gap between the left and right drive gears 67 and 68 and the drive gear 72 of the drive gear disk 7. Therefore, this utility model adds a gear disk, namely a backlash-eliminating gear disk 8, and correspondingly adds a set of gear disk meshing pair contact preload application mechanism 9 (this utility model has three, but is not limited to three). Since the preload application spring 94 of the structure system of the gear disk meshing pair contact preload application mechanism 9 is for preload, it applies a constant force to the rotating pair, namely the aforementioned gear ring meshing pair, so that its meshing surface or contact surface is always tightly fitted, eliminating the gap during reverse movement.

[0042] More specifically, the adjustment process of a car seat turntable should be as smooth and vibration-free as possible, while also withstanding the torsional load of the human body (structural rigidity) and ensuring reliable service life. Therefore, the backlash of ordinary gear pairs directly causes seat wobbling. This invention employs a double-toothed disc, which is essentially a mechanical preload. By stacking the drive toothed disc 7 and the backlash-eliminating toothed disc 8, and under the action of a set of toothed disc meshing pairs and the preload application mechanism 9, gear transmission backlash can be essentially eliminated. This backlash, also known as backlash, refers to the tiny gap between the gear meshing surfaces (approximately 0.1 to 1° in the circumferential direction). Furthermore, the structure of this invention is highly beneficial for improving the system's rigidity, accuracy, and response speed.

[0043] Employing a dual-motor design, in terms of operating modes, during forward rotation, one motor outputs the main torque while the other maintains the preload; during reverse rotation, the aforementioned other motor outputs the main torque while the aforementioned first motor maintains the preload; in static locking, the two motors continuously output opposing torques, forming a rigid self-locking mechanism. Therefore, it is clear that the technical solution provided by this invention is undoubtedly the best available.

[0044] In summary, the technical solution provided by this utility model makes up for the shortcomings of the prior art, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. A car seat rotating device with backlash elimination function, comprising a chassis (1) having a chassis cavity (11); a turntable (2) and a support plate (3) that are vertically corresponding to each other and fixed to each other, the turntable (2) and the support plate (3) forming a rotating pair with the cavity wall of the chassis cavity (11) at a position corresponding to the chassis cavity (11); a seat mounting plate (4) fixed to the turntable (2) at a position above the turntable (2); and a center tray (5) disposed on the turntable. The turntable cavity (21) of the disc (2) is fixed to the chassis (1) by tray fixing seats (51) spaced around the central tray (5) in a circumferential direction; a toothed disc drive mechanism (6) and a drive toothed disc (7), the toothed disc drive mechanism (6) is fixed to the downward side of the central tray (5) and extends upward to the top of the central tray (5) to form a drive toothed disc meshing pair with the drive toothed disc (7), and the drive toothed disc (7) is fixedly connected to the turntable (2) and the support disc (3) by spaced drive toothed disc free-standing feet (71), characterized in that: It also includes a backlash-free toothed disc (8) and a set of toothed disc meshing pair contact preload application mechanisms (9). The backlash-free toothed disc (8) is stacked below the drive toothed disc (7) and forms a backlash-free toothed disc meshing pair with the backlash-free toothed disc (8) while the toothed disc drive mechanism (6) forms the drive toothed disc meshing pair with the drive toothed disc (7). A set of toothed disc meshing pair contact preload application mechanisms (9) are spaced apart around the circumference of the drive toothed disc (7) and connected to the backlash-free toothed disc (8).

2. The automotive seat rotation device with backlash elimination function according to claim 1, characterized in that: A bearing cavity (111) is formed on the wall of the chassis cavity (11) of the chassis (1) and around the circumference of the cavity wall. A support bearing (1111) is provided in the bearing cavity (111). A turntable bearing support mating surface (22) is formed on the outer wall of the turntable (2) and around the circumference of the turntable (2). A support disk bearing support mating surface (31) is formed on the outer wall of the support disk (3) and around the circumference of the support disk (3). After the drive gear plate free-standing support foot (71) is fixedly connected to the turntable (2) and the support disk (3), the turntable bearing support mating surface (22) and the support disk bearing support mating surface (31) together form a rotating pair with the support bearing (1111) in a state of vertical correspondence.

3. The automotive seat rotation device with backlash elimination function according to claim 2, characterized in that: A turntable fixing edge (23) is formed at the bottom of the turntable bearing support mating surface (22) and around the bottom in the direction towards the turntable cavity (21). A turntable fixing edge fixing hole (231) is formed on the turntable fixing edge (23) and at intervals around the circumference of the turntable fixing edge. Support plate fixing holes (32) are formed on the upper surface of the support plate (3) and at intervals around the circumference of the support plate (3), with positions corresponding to the turntable fixing edge fixing holes (231). The spaced-apart drive gear plate free-standing support feet (71) are driven by drive gear plate fixing screws (711) at one end facing the drive gear plate (7). The drive gear plate (7) is fixed to the upward side, while the end facing the fixed edge (23) of the turntable is fixed to the turntable (2) and the support plate (3) by the free-standing support foot turntable fixing screw (712) at the position corresponding to the fixed hole (231) of the fixed edge of the turntable and the fixed hole (32) of the support plate. The shape of the free-standing support foot (71) of the drive gear plate is a Z-shaped or zigzag structure that forms a step.

4. The automotive seat rotation device with backlash elimination function according to claim 1, characterized in that: A set of turntable fixing ears (24) extends at equal intervals on the outer edge of the turntable (2). A set of seat mounting plate fixing ears (41) extends on the seat mounting plate (4) at a position corresponding to the set of turntable fixing ears (24). Each of the set of seat mounting plate fixing ears (41) has a seat mounting plate fixing ear hole (411). The seat mounting plate fixing ear (4111) is fixed to the turntable fixing ear (24) by passing through the turntable fixing ear hole (241) and the seat mounting plate fixing ear hole (411) in sequence from bottom to top.

5. The automotive seat rotation device with backlash elimination function according to claim 1, characterized in that: A central tray mounting screw hole (52) is provided at the edge of the central tray (5) and at one end corresponding to the tray mounting base (51) in a paired state. The central tray mounting screw (521) is fixed at the position corresponding to the central tray mounting screw hole (52) and the tray mounting screw hole (511) provided at the end of the tray mounting base (51) facing the central tray (5). A chassis screw hole (12) is provided on the chassis (1) and at the position corresponding to the end of the tray mounting base (51) away from the central tray (5). The chassis screw (121) is fixed to the tray mounting base (51) at the position corresponding to the chassis screw hole (12) and the tray mounting screw hole (512) provided on the tray mounting base (51). A tray mounting cavity (513) is formed in the middle of the tray mounting base (51). The tray mounting cavity (513) is located below the support plate (3) in a non-contact state with the support plate (3).

6. The automobile seat rotation device with backlash elimination function according to any one of claims 1 to 5, characterized in that: A chassis mounting extension plate (13) extends from the left and right sides of the chassis (1). Each chassis mounting extension plate (13) has a chassis mounting extension plate bolt hole (131). In use, the chassis mounting extension plate (13) is fixed to the vehicle floor or to a mounting bracket set on the vehicle floor by bolts at the positions corresponding to the chassis mounting extension plate bolt holes (131).

7. The automotive seat rotation device with backlash elimination function according to claim 1, characterized in that: A left drive gear clearance hole (53) and a right drive gear clearance hole (54) are provided on the central tray (5). The left and right drive gear clearance holes (53, 54) are symmetrical to each other and maintain a distance between them. The gear drive mechanism (6) includes a left motor (61), a left gearbox (62), a left gearbox mounting base (63), a right motor (64), a right gearbox (65), a right gearbox mounting base (66), a left drive gear (67), a right drive gear (68), and a gear shaft head limiting plate (69). The left motor (61) is driven by the left gearbox (62), and the left gearbox (62) is connected to the left gearbox mounting base (63). The left gearbox mounting base (63) is fixed to the downward-facing side of the center tray (5) by a set of left gearbox mounting screws (631), and the center position of the left gearbox mounting base (63) corresponds to the left drive gear clearance hole (53). The right motor (64) is driven by the right gearbox (65) and is fixed to the downward-facing side of the right gearbox mounting base (66) together with the right motor (64). The right gearbox mounting base (66) is fixed to the downward-facing side of the center tray (5) by a set of right gearbox mounting screws (661), and the center position of the right gearbox mounting base (66) corresponds to the right drive gear clearance hole (54). The lower end of the left drive gear (67) is connected to the left gearbox shaft of the left gearbox (62). The middle part of the left drive gear (67) extends above the left drive gear clearance hole (53) and simultaneously forms a meshing pair with the drive gear disk (7) and the backlash-free gear disk (8). The lower end of the right drive gear (68) is connected to the right gearbox shaft of the right gearbox (65). The middle part of the right drive gear (68) extends above the right drive gear clearance hole (54) and simultaneously forms a meshing pair with the drive gear disk (7) and the backlash-free gear disk (8). The left end of the gear shaft limiting plate (69) is connected to the left end of the left drive gear (67) through the left bushing (692). The upper shaft head (671) of the drive gear is engaged, and the right end of the gear shaft head limiting plate (69) is engaged with the upper shaft head (681) of the right drive gear (68) through the right bushing (693). A limiting plate fixing foot (691) extends from the front and rear sides of the middle part of the gear shaft head limiting plate (69). The limiting plate fixing foot (691) is fixed to the center tray (5) by the limiting plate fixing foot fixing screw (6911). A wire passage hole (694) for the passage of the power supply line is opened at the center position of the gear shaft head limiting plate (69) in the length direction. The wire passage hole (694) corresponds to the center tray line clearance hole (55) opened at the center position of the center tray (5).

8. The automotive seat rotation device with backlash elimination function according to claim 7, characterized in that: The left motor (61) and right motor (64) are servo motors or stepper motors with forward and reverse rotation functions. The left gearbox (62) and right gearbox (65) are worm gear reducers. The left gearbox shaft and right gearbox shaft are worm gear shafts.

9. The automotive seat rotation device with backlash elimination function according to claim 1, characterized in that: The set of gear disc meshing pair contact preload application mechanisms (9) are arranged at equal intervals around the circumference of the drive gear disc (7). Each of the gear disc meshing pair contact preload application mechanisms (9) includes a drive gear disc tension spring post (91), a backlash-free gear disc tension spring post sliding hole (92), a backlash-free gear disc tension spring post (93), and a preload application tension spring (94). The drive gear disc tension spring post (91) is fixed to the upward-facing side of the drive gear disc (7), and the backlash-free gear disc tension spring... The spring post sliding hole (92) is opened on the drive gear plate (7) at the position corresponding to the backlash-free gear plate tension spring post (93). The backlash-free gear plate tension spring post (93) is fixed on the upward side of the backlash-free gear plate (8) and extends above the drive gear plate (7) at the position corresponding to the backlash-free gear plate tension spring post sliding hole (92). One end of the preload tension spring (94) is hung on the drive gear plate tension spring post (91), and the other end is hung on the backlash-free gear plate tension spring post (93).

10. A car seat, characterized in that: A car seat rotation device with gap elimination function as described in claim 1.

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