Planetary gear type automobile seat angle adjuster and automobile seat thereof

Abstract

A planetary gear type automobile seat angle adjuster belongs to the technical field of automobile seat accessories. The angle adjuster comprises a fixed disc and a movable disc, the fixed disc cavity wall is provided with fixed disc satellite wheel meshing teeth, and the movable disc cavity wall is provided with movable disc satellite wheel meshing teeth; a sun wheel and a group of satellite wheels, the sun wheel is arranged at the central position of the cavity formed by the fixed disc cavity and the movable disc cavity, and the group of satellite wheels are equidistantly distributed and arranged in the cavity formed by the fixed disc cavity and the movable disc cavity along with the sun wheel; a drive shaft; the angle adjuster further comprises a wheel system anti-wandering mechanism for preventing the sun wheel and the group of satellite wheels from left and right wandering and abutting the left side of the sun wheel and the group of satellite wheels against the fixed disc cavity bottom wall of the fixed disc cavity, and the wheel system anti-wandering mechanism is arranged in the movable disc cavity in a matched state with the right side of the sun wheel and the group of satellite wheels. The angle adjuster has the advantages of ensuring uniform load distribution, eliminating vibration and noise, reflecting good transmission efficiency, preventing partial load and abnormal wear, and improving transmission reliability.

Description

Technical Field

[0001] This utility model belongs to the technical field of automotive seat accessories, specifically relating to a planetary gear type automotive seat adjuster, and also to the automotive seat thereof. Background Technology

[0002] Existing automotive seat adjusters commonly use a toothed plate type (also known as a "pawl type adjuster"). This type of adjuster is structured like a wrench engaged in a gear, with a rigid pawl engaging the toothed grooves of the toothed plate to fix the angle. In the event of a major impact, such as a rear-end collision, almost all the force is concentrated at the contact point between the pawl and one or a few toothed grooves. This results in a truly "hard-on-hard" structure, making it highly susceptible to stress concentration, which can cause tooth breakage or pawl bending, leading to sudden backrest failure and tilting backward, causing secondary injuries to the occupants.

[0003] Based on professional knowledge, the advantages of planetary gear structures include: simultaneous meshing of multiple teeth, with power transmitted from the input shaft (sun gear), evenly distributed through multiple satellite gears (planet gears), and finally output through the internal gear ring (outer ring); load dispersion, where a huge impact force is simultaneously distributed to the sun gear, multiple planet gears (also called "satellite gears"), and numerous (e.g., dozens) meshing teeth of the internal gear ring, greatly reducing the force borne by each gear tooth; and surface contact, where gear meshing exhibits involute tooth profile contact, resulting in a larger contact area and lower pressure compared to the point / line contact of a toothed plate structure. Therefore, it is not limited to the aforementioned advantages that planetary gear structures inherently possess extremely high impact resistance and fatigue strength, demonstrating exceptional performance in crash tests and effectively avoiding safety hazards caused by adjuster failure. In short, planetary gear-type car seat adjusters are not significantly affected by the drive method; whether manual or electric, they exhibit superior safety, smoothness, and precision compared to toothed plate structure adjusters.

[0004] While existing planetary gear-type automotive seat adjusters are highly regarded in the industry, they still suffer from the following unresolved technical problems: First, during adjustment, the set of satellite gears meshing with the sun gear lacks effective control, resulting in inconsistent rotational stability and even jamming due to a lack of synchronization. This lack of synchronization refers to uneven meshing depth between the satellite gears, which are evenly spaced around the sun gear, and the sun gear. Insufficient meshing depth or failure to achieve full tooth contact leads to uneven load distribution, vibration and noise, reduced transmission efficiency, uneven load distribution, and abnormal wear. Second, due to the lack of necessary anti-runaway restraint on the side (toothless side) of the sun gear, when runaway occurs, it affects the contact between the aforementioned satellite gears and the bottom wall of the fixed plate cavity, causing partial meshing between the satellite gears and the sun gear, resulting in unreliable transmission and uneven wear.

[0005] As can be seen from the above explanation, regardless of whether it is the satellite gear or the sun gear, the aforementioned technical problems cannot be avoided if there is a lack of necessary control over either one. In particular, although technical information related to planetary gear type car seat adjusters can be found in published Chinese patent documents, such as CN2295389Y, which recommends a "two-stage transmission planetary gear type seat adjuster", this patent aims to achieve a large transmission ratio, simple and convenient operation, stable and reliable operation, and improved load-bearing capacity under the premise of stepless adjustment. Therefore, it does not provide any inspiration to help remedy the technical problems mentioned above. Utility Model Content

[0006] The objective of this invention is to provide a planetary gear type car seat adjuster that helps to prevent the sun gear and / or satellite gear from shifting, thereby ensuring consistent meshing between the satellite gear and the sun gear, ensuring uniform load distribution, eliminating vibration and noise, exhibiting good transmission efficiency, preventing off-center loading and abnormal wear, and facilitating good abutment between the satellite gear and the bottom wall of the fixed plate cavity, thus ensuring full and good meshing between the satellite gear and the sun gear and improving transmission reliability.

[0007] The objective of this invention is to provide a car seat that enables the full realization of the technical effects of the planetary gear type car seat adjuster.

[0008] To fulfill the primary objective of this utility model, the technical solution provided is as follows: A planetary gear type car seat adjuster includes a fixed disk and a movable disk that face each other and are fixed together by a fixed sleeve on the circumferential edge. A cavity is formed on the side of the fixed disk facing the movable disk, and fixed disk satellite gear meshing teeth are formed on the cavity wall of the fixed disk cavity and around the circumference of the cavity wall. A movable disk cavity is formed on the side of the movable disk facing the fixed disk, and movable disk satellite gear meshing teeth are formed on the cavity wall of the movable disk cavity and around the circumference of the cavity wall. The meshing teeth of the fixed and movable disk satellite gears correspond to each other. A sun gear and a set of satellite gears are also included. The sun gear is positioned at the center of the cavity formed by the fixed disk cavity and the movable disk cavity. The set of satellite gears are equidistant from each other and simultaneously mesh with the sun gear, the fixed disk satellite gears, and the movable disk satellite gears. The sun gear is housed within a cavity also composed of a fixed plate cavity and a moving plate cavity, with the satellite wheels engaged in the meshing state. A drive shaft is present, the right end of which passes through a fixed plate drive shaft through-hole located at the center of the bottom wall of the fixed plate cavity of the fixed plate and engages with a sun gear spline hole located at the center of the sun gear. The drive shaft head at the right end of the drive shaft passes through the sun gear spline hole and is rotatably supported on a drive shaft head support hole located at the center of the bottom wall of the moving plate cavity of the moving plate. The feature is that it also includes a wheel system anti-movement mechanism for preventing the sun gear and a set of satellite wheels from moving left and right, and for causing the left side of the sun gear and a set of satellite wheels to abut against the bottom wall of the fixed plate cavity of the fixed plate cavity. This wheel system anti-movement mechanism is located within the moving plate cavity when engaged with the right side of the sun gear and a set of satellite wheels.

[0009] In a specific embodiment of this utility model, the wheel train anti-slip mechanism includes a sun gear limiting sleeve and a satellite gear limiting disc. The sun gear limiting sleeve and the satellite gear limiting disc are disposed in the moving disc cavity in a state of cooperating with the right side of the sun gear and a set of satellite gears, respectively. The sun gear limiting sleeve is located in the satellite gear limiting disc cavity of the satellite gear limiting disc. A drive shaft head clearance hole is opened at the center of the sun gear limiting sleeve and at a position corresponding to the spline hole of the sun gear. The drive shaft head of the drive shaft is rotatably supported on the drive shaft head support hole after passing through the drive shaft head clearance hole.

[0010] In another specific embodiment of this utility model, the sun gear limiting sleeve is shaped like a frustum of a cone. The smaller diameter end of the frustum of a cone faces the sun gear and is fitted against the right opening of the spline hole of the sun gear, while the larger diameter end of the frustum of a cone faces the moving disk cavity of the moving disk and is fitted against the moving disk cavity wall.

[0011] In another specific embodiment of this utility model, a satellite wheel pivot support flange protruding from the surface of the right side of each of the set of satellite wheels is formed at the center position of the right side of the satellite wheel. The satellite wheel limiting plate has a number of satellite wheel pivot support flange holes equal to the number of the set of satellite wheels at the position corresponding to the satellite wheel pivot support flange. The satellite wheel pivot support flange pivotally engages with the satellite wheel pivot support flange holes.

[0012] In another specific embodiment of this utility model, the number of satellite wheels in a set is three, which are equally spaced, and the number of satellite wheel pivot support flange holes is three.

[0013] In another specific embodiment of this utility model, an external spline is formed at the right end of the drive shaft and at a position to the left of the drive shaft head, around the right end of the drive shaft in the circumferential direction. The external spline at the drive shaft end is in drive engagement with the spline hole of the sun gear.

[0014] In a further specific embodiment of this utility model, the left end of the drive shaft is configured as a square shaft connector, which is used to provide a manual operating tool for use or to provide a power drive device for transmission connection; the manual operating tool is an operating handle, and the electric drive device is a DC motor with a worm gear reducer or a permanent magnet brushed DC motor.

[0015] In a further specific embodiment of this utility model, the outer diameters of the fixed plate and the moving plate are equal, the fixed sleeve forms a fixed sleeve cavity, the width of the cavity wall forming the fixed sleeve cavity is the sum of the thicknesses of the edge portions of the fixed plate and the moving plate, and the right edge portion of the fixed sleeve cavity is folded inward to form a fixed sleeve cavity bottom wall flange edge, the left side of the fixed sleeve cavity bottom wall flange edge is in contact with the right side of the moving plate.

[0016] In yet another specific embodiment of this utility model, a post-formed extended limiting step is formed on the right end face of the drive shaft head.

[0017] To fulfill another objective of this utility model, an automobile seat is provided, which includes the aforementioned planetary gear type automobile seat adjuster.

[0018] The technical effect of the present invention is as follows: By adding a wheel anti-roll mechanism to the structure of the planetary gear type car seat adjuster to prevent the sun gear and a set of satellite gears from moving left and right, and to ensure that the left side of the sun gear and a set of satellite gears abuts against the bottom wall of the fixed plate cavity, the system helps to prevent the sun gear and / or a set of satellite gears from moving left and right. This ensures consistent meshing between the set of satellite gears and the sun gear, ensures uniform load distribution, eliminates vibration and noise, exhibits good transmission efficiency, prevents uneven loading and abnormal wear, and facilitates good abutment between the set of satellite gears and the bottom wall of the fixed plate cavity, thus improving transmission reliability. Equipping a planetary gear type car seat adjuster with the aforementioned wheel anti-roll mechanism on a car seat can provide the aforementioned technical effects. Attached Figure Description

[0019] Figure 1 This is an assembly structure diagram of the present invention; Figure 2 for Figure 1 The diagram shows the sun wheel 4, a set of satellite wheels 5, and the wheel system anti-slip mechanism 7 installed in the fixed and moving disk cavities 11 and 21 of the fixed and moving disks 1 and 2, with the fixed and moving disks 1 and 2 in a fixed state by the fixed sleeve 3.

[0020] In the diagram: 1. Fixed plate, 11. Fixed plate cavity, 111. Fixed plate satellite wheel meshing teeth, 12. Fixed plate drive shaft through hole; 2. Moving plate, 21. Moving plate cavity, 211. Moving plate satellite wheel meshing teeth, 212. Sun gear limiting sleeve stepped cavity, 213. Satellite wheel limiting plate stepped cavity, 22. Drive shaft head support hole; 3. Fixed sleeve, 31. Fixed sleeve cavity, 311. Fixed sleeve cavity bottom wall flange edge; 4. Sun gear, 41. Sun gear spline hole, 5. Satellite wheel, 51. Satellite wheel pivot support flange; 6. Drive shaft, 61. Drive shaft end external spline, 62. Drive shaft head, 621. Post-formed extended limiting step, 63. Square shaft connector, 7. Gear train anti-slip mechanism, 71. Sun gear limiting sleeve, 711. 72. Drive shaft head clearance hole; 72. Satellite wheel limiting plate; 721. Satellite wheel limiting plate cavity; 722. Satellite wheel pivot bearing flange hole. Detailed Implementation

[0021] 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.

[0022] In the following description, all directional or orientational concepts involving up, down, left, right, front, and back are based on the current direction. Figure 1 The location and state of the object are taken as examples, and therefore should not be construed as a special limitation on the technical solution provided by this utility model.

[0023] Please see Figure 1 and Figure 2 The diagram shows a fixed disk 1 and a movable disk 2 facing each other and fixed together at the circumferential edge by a fixed sleeve 3. A fixed disk cavity 11 is formed on the side of the fixed disk 1 facing the movable disk 2. Fixed disk satellite gear meshing teeth 111 are formed on the cavity wall (side wall) of the fixed disk cavity 11 and around the circumference of the cavity wall. A movable disk cavity 21 is formed on the side wall of the movable disk cavity 21 facing the fixed disk 1. Movable disk satellite gear meshing teeth 211 are formed on the cavity wall (side wall) of the movable disk cavity 21 and around the circumference of the cavity wall. The number of fixed and movable disk satellite gear meshing teeth 111 and 211 are equal and correspond to each other. A sun gear 4 and a set of satellite gears 5 are shown. The sun gear 4 is the central gear, and the set of satellite gears 5 is a set of planetary gears (hereinafter the same). The sun gear 4 is located in the fixed disk cavity... At the center of the cavity formed by the fixed plate cavity 11 and the moving plate cavity 21, a group of satellite wheels 5 are distributed at equal distances from each other and are simultaneously engaged with the aforementioned sun wheel 4, the fixed plate satellite wheel meshing teeth 111 and the moving plate satellite wheel meshing teeth 211. They are arranged in the same cavity formed by the fixed plate cavity 11 and the moving plate cavity 21. A drive shaft 6 is shown. The right end of the drive shaft 6 passes through the fixed plate drive shaft through hole 12 at the center of the fixed plate cavity bottom wall of the fixed plate cavity 11 of the fixed plate 1 and is engaged with the sun wheel spline hole 41 at the center of the sun wheel 4. The drive shaft head 62 at the right end of the drive shaft 6 passes through the sun wheel spline hole 41 and is rotatably supported on the drive shaft head support hole 22 at the center of the moving plate cavity bottom wall of the moving plate cavity 21 of the moving plate 2.

[0024] The key technical point of the technical solution provided by this utility model is that the structure system of the planetary gear type car seat adjuster also includes a wheel system anti-movement mechanism 7 for preventing the aforementioned sun gear 4 and a set of satellite gears 5 from moving left and right and for making the left side of the sun gear 4 and a set of satellite gears 5 abut (or rotate contact) against the bottom wall of the fixed plate cavity 11. The wheel system anti-movement mechanism 7 is set in the aforementioned moving plate cavity 21 in a state of cooperating with the right side of the aforementioned sun gear 4 and a set of satellite gears 5.

[0025] The applicant should clarify that the aforementioned anti-slip mechanism 7 can also be called a sun gear-planet gear set axial positioning mechanism, a sun gear-planet gear set axial constraint mechanism, a sun gear and planet gear axial slippage co-constraint mechanism, or a star gear set anti-slip mechanism, etc., and therefore cannot be limited by changes in the form of technical feature names.

[0026] Please stay tuned. Figure 1 and Figure 2 The preferred, but not absolutely limited, structure of the aforementioned anti-slip mechanism 7 for the wheel system is as follows: it includes a sun gear limiting sleeve 71 and a satellite gear limiting disc 72. The sun gear limiting sleeve 71 and the satellite gear limiting disc 72 are disposed in the aforementioned moving disc cavity 21 (or located in the moving disc cavity 21) in a state of cooperating with the right side of the aforementioned sun gear 4 and a set of satellite gears 5, respectively. The sun gear limiting sleeve 71 is located in the satellite gear limiting disc cavity 721 of the satellite gear limiting disc 72. A drive shaft head clearance hole 711 is opened at the center of the sun gear limiting sleeve 71 and at the position corresponding to the aforementioned sun gear spline hole 41. The aforementioned drive shaft head 62 of the aforementioned drive shaft 6 is rotatably supported on the drive shaft head support hole 22 after passing through the drive shaft head clearance hole 711.

[0027] In this embodiment, the aforementioned sun gear limiting sleeve 71 is shaped like a frustum of a cone. The smaller diameter end of the frustum of a cone faces the aforementioned sun gear 4 and is in contact with the right opening of the aforementioned sun gear spline hole 41, or more precisely, the right side of the sun gear 4. Figure 2 (as shown), and the large-diameter end of the frustum-shaped cone faces the moving disk cavity 21 of the aforementioned moving disk 2 and is in contact with the cavity wall of the moving disk cavity 21, more specifically, it is in contact with the sun gear limiting sleeve stepped cavity 212 of the moving disk cavity 21 ( Figure 2 (See illustration). The sun gear limiting sleeve 71 with this structure can effectively limit or constrain the sun gear 4, so that the left side of the sun gear 4 is in contact with the bottom wall of the fixed plate cavity 11, and there will be no axial or left and right movement. It can truly realize the corresponding technical effects recorded by the applicant in the above technical effect column.

[0028] At the center of the right side of each of the aforementioned set of satellite wheels 5 (i.e., planetary gears), a satellite wheel pivot support flange 51 is formed, protruding from the surface of the right side of the aforementioned satellite wheel. On the aforementioned satellite wheel limiting plate 72, at the position corresponding to the satellite wheel pivot support flange 51, there are a number of satellite wheel pivot support flange holes 722 equal to the aforementioned set of satellite wheels 5. The satellite wheel pivot support flange 51 and the satellite wheel pivot support flange holes 722 are pivotally engaged.

[0029] The aforementioned set of satellite wheels 5 consists of three equally spaced satellite wheels, and the aforementioned satellite wheel pivot bearing flange holes 722 consist of three satellite wheels.

[0030] When the aforementioned satellite wheel pivot bearing flange 51 and the aforementioned satellite wheel pivot bearing flange hole 722 are pivotally engaged, since the satellite wheel limiting disk 72 is located between the right side of a set of satellite wheels 5 and the bottom wall of the moving disk cavity 21, that is, the satellite wheel limiting disk 72 is located in the satellite wheel limiting disk stepped cavity 213 of the moving disk cavity 21, the sun wheel limiting sleeve 71 can ensure that the left side of a set of satellite wheels 5 is in good contact with the cavity wall of the fixed disk cavity 11, and there will be no axial movement, i.e., left and right movement. It can objectively realize the corresponding technical effects recorded by the applicant in the above technical effect column.

[0031] Depend on Figure 1 As shown, an external spline 61 is formed around the right end of the aforementioned drive shaft 6, located to the left (or "right side") of the aforementioned drive shaft head 62, in a circumferential direction. This external spline 61 engages with the aforementioned sun gear spline hole 41, allowing the sun gear to be driven by the external spline 61 of the drive shaft 6. Based on common sense, in actual use, the aforementioned drive shaft 6 can rotate both clockwise and counterclockwise, depending on the adjustment direction of the car seat backrest, such as tilting forward or backward.

[0032] The left end of the aforementioned drive shaft 6 is configured as a square shaft connector 63. In use, this square shaft connector 63 allows for the use of a manual operating tool or a power drive device for transmission. The aforementioned manual operating tool is an operating handle, and the aforementioned power drive device is a DC motor with a worm gear reducer or a permanent magnet brushed DC motor. Therefore, this utility model does not necessarily limit the driving method of the drive shaft 6 to manual or electric.

[0033] The outer diameters of the aforementioned fixed plate 1 and the aforementioned moving plate 2 are equal. The aforementioned fixed sleeve 3 forms a fixed sleeve cavity 31. The width of the cavity wall forming the fixed sleeve cavity 31 is the sum of the thicknesses of the circumferential edge portions of the fixed plate 1 and the moving plate 2. The right edge portion of the fixed sleeve cavity 31 of the fixed sleeve 3 is folded inward to form a fixed sleeve cavity bottom wall flange edge 311 (also called a "stop edge"). The left side of the fixed sleeve cavity bottom wall flange edge 311 is in contact with the right side of the aforementioned moving plate 2. Figure 2 Show).

[0034] To limit the right end of the drive shaft head 62, a post-formed extended limiting step 621 is formed on the right end face of the drive shaft head 62. This post-formed extended limiting step 621 is formed by extending the material of the right end face of the drive shaft head 62 through a pressing process after the drive shaft head 62 passes through the drive shaft head support hole 22. Alternatively, a retaining ring groove can be formed on the drive shaft head 62, and a retaining ring can be embedded in the retaining ring to limit the right end of the drive shaft head 62. Furthermore, a cotter pin can be used for limitation; for example, a cotter pin hole can be opened at the end of the drive shaft head 62 extending to the right side of the moving plate 2, and a cotter pin can be inserted into the cotter pin hole. Also, a limiting ring can be welded to the right end of the drive shaft head 62, and so on.

[0035] By equipping the car seat with the aforementioned planetary gear type car seat adjuster, the car seat can fully possess the advantages listed in the applicant's technical effects section above.

[0036] By manually or electrically driving the square shaft connector 63 of the drive shaft 6, the drive shaft 6 rotates. Because the external spline 61 at the end of the drive shaft engages with the spline hole 41 of the sun gear 4 (transmission connection), the drive shaft 6 drives the sun gear 4, which in turn drives a set of satellite gears 5 meshing with it to rotate synchronously along the meshing teeth 111 of the fixed plate satellite gears and the meshing teeth 211 of the moving plate satellite gears. Due to the anti-slip mechanism 7, the sun gear 4 and the set of satellite gears 5 fully possess the technical effects described by the applicant in the above-mentioned technical effects section.

[0037] As is known from professional knowledge, in the application of this utility model, the fixed plate 1 is installed on the seat of the car seat, while the movable plate 2 is installed on the back of the car seat. In short, although the structures are different, the installation and use methods on car seats can be referenced from similar CN216833326U (a vehicle seat adjuster), CN205468635U (a stepless adjustable adjuster), and CN218400301U (an electric adjustment mechanism for a car seat), etc., so the applicant will not elaborate further.

[0038] 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 planetary gear type car seat adjuster, comprising a fixed plate (1) and a movable plate (2) that face each other and are fixed together at the edge of the circumference by a fixed sleeve (3). A fixed plate cavity (11) is formed on the side of the fixed plate (1) facing the movable plate (2). Fixed plate satellite gear meshing teeth (111) are formed on the wall of the fixed plate cavity (11) and around the wall of the fixed plate cavity in the circumferential direction. A movable plate cavity (21) is formed on the side of the movable plate (2) facing the fixed plate (1). Movable plate satellite gear meshing teeth (211) are formed on the wall of the movable plate cavity (21) and around the wall of the movable plate cavity in the circumferential direction. The fixed and movable plate satellite gear meshing teeth (111, 211) correspond to each other. A sun gear (4) and a set of satellite gears (5) are provided. The sun gear (4) is disposed in the cavity formed by the fixed plate cavity (11) and the movable plate cavity (21). At the central position, a group of satellite wheels (5) are distributed at equal distances from each other and are simultaneously engaged with the sun wheel (4), the fixed plate satellite wheel meshing teeth (111), and the moving plate satellite wheel meshing teeth (211). They are arranged in the cavity also formed by the fixed plate cavity (11) and the moving plate cavity (21) along with the sun wheel (4); a drive shaft (6) is provided, the right end of which passes through the fixed plate drive shaft through hole (12) at the center of the fixed plate cavity bottom wall of the fixed plate cavity (11) of the fixed plate (1) and is engaged with the sun wheel spline hole (41) at the center of the sun wheel (4). The drive shaft head (62) at the right end of the drive shaft (6) passes through the sun wheel spline hole (41) and is rotatably supported on the drive shaft head support hole (22) at the center of the moving plate cavity bottom wall of the moving plate cavity (21) of the moving plate (2); characterized in that: It also includes a wheel system anti-movement mechanism (7) for preventing the sun gear (4) and a set of satellite gears (5) from moving left and right and for making the left side of the sun gear (4) and a set of satellite gears (5) abut against the bottom wall of the fixed plate cavity (11). The wheel system anti-movement mechanism (7) is set in the moving plate cavity (21) in a state of cooperating with the right side of the sun gear (4) and a set of satellite gears (5).

2. The planetary gear type car seat adjuster according to claim 1, characterized in that: The wheel system anti-slip mechanism (7) includes a sun gear limiting sleeve (71) and a satellite gear limiting disc (72). The sun gear limiting sleeve (71) and the satellite gear limiting disc (72) are arranged in the moving disc cavity (21) in a state that they are respectively engaged with the right side of the sun gear (4) and a set of satellite gears (5). The sun gear limiting sleeve (71) is located in the satellite gear limiting disc cavity (721) of the satellite gear limiting disc (72). A drive shaft head clearance hole (711) is opened at the center of the sun gear limiting sleeve (71) and at the position corresponding to the sun gear spline hole (41). The drive shaft head (62) of the drive shaft (6) is rotatably supported on the drive shaft head support hole (22) after passing through the drive shaft head clearance hole (711).

3. The planetary gear type car seat adjuster according to claim 2, characterized in that: The sun gear limiting sleeve (71) is shaped like a frustum of a cone. The smaller diameter end of the frustum of a cone faces the sun gear (4) and is in close contact with the right opening of the spline hole (41) of the sun gear. The larger diameter end of the frustum of a cone faces the moving disk cavity (21) of the moving disk (2) and is in close contact with the wall of the moving disk cavity (21).

4. The planetary gear type car seat adjuster according to claim 2, characterized in that: At the center of the right side of each of the set of satellite wheels (5), there is a satellite wheel pivot support flange (51) protruding from the surface of the right side of the satellite wheel. On the satellite wheel limiting plate (72), at the position corresponding to the satellite wheel pivot support flange (51), there are satellite wheel pivot support flange holes (722) in the same number as the set of satellite wheels (5). The satellite wheel pivot support flange (51) and the satellite wheel pivot support flange holes (722) are pivotally engaged.

5. The planetary gear type car seat adjuster according to claim 4, characterized in that: The number of satellite wheels (5) is three, which are evenly spaced, and the number of satellite wheel pivot bearing flange holes (722) is three.

6. The planetary gear type car seat adjuster according to claim 1, characterized in that: At the right end of the drive shaft (6) and on the left side of the drive shaft head (62), a drive shaft end external spline (61) is formed around the right end of the drive shaft (6) in the circumferential direction. The drive shaft end external spline (61) is in drive engagement with the sun gear spline hole (41).

7. The planetary gear type automotive seat adjuster according to claim 1 or 6, characterized in that: The left end of the drive shaft (6) is configured as a square shaft connector (63), which is used to provide a manual operating tool for use or to provide a power drive device for transmission connection. The manual operating tool is an operating handle, and the electric drive device is a DC motor with a worm gear reducer or a permanent magnet brushed DC motor.

8. The planetary gear type car seat adjuster according to claim 1, characterized in that: The outer diameters of the fixed plate (1) and the moving plate (2) are equal. The fixed sleeve (3) forms a fixed sleeve cavity (31). The width of the cavity wall of the fixed sleeve cavity (31) is the sum of the thicknesses of the edge portions of the fixed plate (1) and the moving plate (2). The right edge portion of the fixed sleeve cavity (31) of the fixed sleeve (3) is folded inward to form a fixed sleeve cavity bottom wall flange edge (311). The left side of the fixed sleeve cavity bottom wall flange edge (311) is in contact with the right side of the moving plate (2).

9. The planetary gear type car seat adjuster according to claim 2, characterized in that: A post-formed extended limiting step (621) is formed on the right end face of the drive shaft head (62).

10. A car seat, characterized in that: It has a planetary gear type car seat adjuster as described in claim 1.

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