Concentric drive recliner and car seat

Abstract

The present invention discloses a concentric transmission angle adjuster and a car seat, comprising an outer tooth plate and an inner tooth plate, which rotate eccentrically relative to each other, and a concentric plate, which is arranged concentrically with one of the outer tooth plate and the inner tooth plate, and the other is provided with a transmission boss, the concentric plate is provided with a transmission hole, the transmission boss is inserted into the transmission hole, and when the transmission boss rotates, it can be tangent to the transmission hole to drive the concentric plate to rotate. By providing a concentric plate with a transmission hole, and the concentric plate is connected to the backrest, the concentric plate converts the eccentric rotation of the inner tooth plate or the outer tooth plate into concentric rotation, that is, a concentric transmission angle adjuster is provided, so that during the angle adjustment process, the eccentric swing can be improved or even eliminated, thereby improving the user experience.

Description

Technical Field

[0001] The invention relates to the technical field of angle adjustment, and in particular to a concentric transmission angle adjuster and a car seat. Background Art

[0002] The recliner is one of the components of a car seat, which allows users to adjust the angle of the backrest relative to the seat according to their needs.

[0003] Chinese patent CN101941389B discloses a tooth difference planetary gear transmission angle adjuster, which mainly includes an inner tooth plate with an inner tooth ring fixedly connected to the backrest, an outer tooth plate with an outer tooth ring fixedly connected to the seat, an eccentric wheel, a wedge block and a wedge-tightening torsion spring, all of which are assembled in a sheath. The eccentric wheel is in an eccentric ring shape as a whole and forms a small tooth difference planetary gear transmission mechanism with the inner tooth plate and the outer tooth plate.

[0004] According to the transmission principle of the recliner of this structure, the center of the outer tooth plate is O, the center of the inner tooth plate is O1, and the center distance between the two is e, that is, the two need to rotate eccentrically, the outer circle of the outer tooth plate is concentrically fixed with the sleeve, and a gap slightly larger than 2e is left between the outer circle of the inner tooth plate and the sleeve. During the adjustment process, the outer tooth plate is fixed, and the inner tooth plate rotates eccentrically relative to the outer tooth plate, with an eccentric distance of e. Therefore, the backrest also moves eccentrically relative to the seat, with a swing amplitude of 2e. This will cause the occupant's backrest to not only rotate around the seat shaft during the backrest adjustment process, but also inevitably swing up, down, left, and right eccentrically relative to the seat rotation center. In severe cases, shaking or noise may occur, affecting the comfort of the occupant. Summary of the invention

[0005] The present invention provides a concentric transmission angle adjuster, comprising an outer tooth plate and an inner tooth plate, which rotate eccentrically relative to each other, and also comprising a concentric plate, which is arranged concentrically with one of the outer tooth plate and the inner tooth plate, and the other is provided with a transmission boss, the concentric plate is provided with a transmission hole, the transmission boss is inserted into the transmission hole, and when the transmission boss rotates, it can be tangent to the transmission hole to drive the concentric plate to rotate to achieve angle adjustment.

[0006] By setting a concentric plate with a transmission hole, the concentric plate is connected to the component whose angle needs to be adjusted. Since the concentric plate and the transmission boss are set to roll tangently and sufficient clearance is left in the radial direction, the radial movement of the transmission boss is filtered out by the transmission hole. Therefore, the concentric plate only transmits pure rotation and does not make eccentric movement. At this time, the concentric plate converts the eccentric rotation of the inner tooth plate or the outer tooth plate into concentric rotation, that is, a concentric transmission angle adjuster is provided. In this way, during the angle adjustment process, the eccentric swing can be improved or even eliminated, thereby improving the user experience.

[0007] Optionally, the entire inner contour of the transmission hole entirely or partially overlaps with the outer contour of the transmission boss after being uniformly expanded outwards.

[0008] Optionally, the transmission boss is a circular boss with a diameter of d, and the transmission hole is a circular hole with a diameter of d+2e.

[0009] Optionally, the entire inner contour of the transmission hole coincides entirely or partially with the outer contour of the motion track region of the transmission boss.

[0010] Optionally, the transmission boss is a circular boss or a waist-shaped circular boss, and the transmission hole is a circular hole or a waist-shaped circular hole correspondingly.

[0011] Optionally, the transmission hole is in the shape of a notch with an opening on one side, and the opening faces the center of the concentric plates.

[0012] Optionally, the number of the transmission bosses and the transmission holes is at least two, and at any position of the relative eccentric rotation of the inner tooth plate and the outer tooth plate, at least two of the transmission bosses are tangent to the corresponding transmission holes.

[0013] Optionally, the transmission bosses and the transmission holes are evenly distributed along the circumferential direction.

[0014] The present solution also provides a car seat, comprising a first component and a second component whose angle is adjustable relative to the first component, and a recliner, wherein the recliner is a concentric transmission recliner as described in any one of the above items, wherein the concentric plate is connected to the second component, and the outer tooth plate or the inner tooth plate concentrically arranged with the concentric plate is connected to the first component. Since the recliner is a concentric transmission recliner as described in any one of the above items, the same technical effect as described above is achieved.

[0015] Optionally, the first component is a seat of the car seat, and the second component is a backrest. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the eccentric state of the outer tooth plate and the inner tooth plate of the angle adjuster in Example 1;

[0017] Figure 2 Axonometric view of the angle adjuster in Example 1 as viewed from the inner gear plate side;

[0018] Figure 3 is an axonometric view of Embodiment 1 viewed from the outer gear plate side;

[0019] Figure 4 yes Figure 2 The front view of the inner gear plate side of the center adjuster;

[0020] Figure 5 yes Figure 4 sectional view of .

[0021] Figure 6The motion trajectory envelope diagram of the internal gear plate transmission boss in Example 1;

[0022] Figure 7 It is a schematic diagram of setting the transmission hole of the concentric plate as a blind hole in Example 2;

[0023] Figure 8 for Figure 7 A cross-sectional view of

[0024] Fig. 9 is an envelope diagram of the motion trajectory of the transmission boss of the inner gear plate of the recliner in Example 3;

[0025] Fig.10 A schematic diagram of a transmission boss provided on the outer plate of the angle adjuster in Example 4;

[0026] Fig.11 for Fig.10 sectional view of .

[0027] Figure 1-11 The reference numerals in the drawings are described as follows:

[0028] 1. Sheath; 11. Inner circle of sheath; 12. Inner end face of sheath; 2. Concentric plate; 21. Transmission hole; 22. Outer circle of concentric plate; 23. Outer end face of concentric plate; 24. Inner end face of concentric plate; 3. Inner tooth plate; 31, 43 transmission bosses; 32. Outer end face of inner tooth plate; 33. Center hole of inner tooth plate; 4. Outer tooth plate; 41. Outer circle of outer tooth plate; 42. Center hole of outer tooth plate. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] Please refer to Figure 1-5 , Figure 1 Schematic diagram of the eccentric state of the outer tooth plate 4 and the inner tooth plate 3 of the angle adjuster in Example 1; Figure 2 Axonometric view of the angle adjuster in Example 1 as viewed from the inner gear plate 3 side; Figure 3 is an axonometric view of the embodiment 1 viewed from the side of the outer tooth plate 4; Figure 4 yes Figure 2 The front view of the inner gear plate 3 side of the middle adjuster; Figure 5 yes Figure 4 sectional view of .

[0032] The angle adjuster includes an outer tooth plate 4, an inner tooth plate 3, an eccentric wheel, a wedge block, etc., wherein the outer tooth plate 4 has an outer tooth ring, the inner tooth plate 3 has an inner tooth ring, the outer tooth ring and the inner tooth ring are meshed, the outer tooth plate 4 is connected to the seat, and the inner tooth plate 3 is connected to the backrest. The center of the inner tooth plate 3 has a shoulder, the middle of the outer tooth plate 4 is provided with an axial hole, the shoulder is inserted into the axial hole, the shoulder and the axial hole are eccentrically arranged, a radial eccentric area is formed between the shoulder and the axial hole, the eccentric wheel is arranged in the radial eccentric area, the eccentric wheel is an eccentric ring structure as a whole, and forms a planetary gear transmission mechanism with a small tooth difference with the inner tooth plate 3 and the outer tooth plate 4. When the backrest angle is adjusted, the inner tooth plate 3 and the outer tooth plate 4 rotate eccentrically relative to each other. The specific working principle is the same as the background technology description, which can be understood by reference. In addition, the angle adjuster also includes a sleeve 1, and the above-mentioned inner tooth plate 3, outer tooth plate 4, eccentric wheel and other components are all assembled in the sleeve 1. The sleeve 1 can protect the above-mentioned components and is conducive to ensuring coaxiality and maintaining the meshing performance of the outer tooth plate 4 and the inner tooth plate 3.

[0033] like Figure 1 As shown, the inner tooth plate 3 has an inner tooth plate center hole 33, marked as O, and the outer tooth plate 4 has an outer tooth plate center hole 42, marked as O1. The two are eccentric, resulting in an eccentricity e.

[0034] In this embodiment, the angle adjuster further comprises a concentric plate 2, which is arranged concentrically with the outer tooth plate 4 and the sleeve 1, and the concentric plate 2 is rotatable relative to the outer tooth plate 4 and the sleeve 1. Figure 5 As shown, the inner circle 11 of the sheath is concentrically matched with the outer circle 22 of the concentric plate and the outer circle 41 of the outer tooth plate. The inner circle 11 of the sheath and the outer circle 41 of the outer tooth plate can be welded or riveted to be fixed. Figure 2 As shown, the concentric plate 2 is arranged between the outer end surface 32 of the inner tooth plate and the inner end surface 12 of the sleeve. At the same time, the concentric plate 2 is provided with a transmission hole 21, and the outer end surface 32 of the inner tooth plate is provided with a transmission boss 31. After assembly, the transmission boss 31 of the inner tooth plate 3 can be inserted into the transmission hole 21. Figure 2 , 3 As shown, the concentric plate 2 has a concentric plate outer end surface 23 facing the inner end surface 11 of the sleeve, and a concentric plate inner end surface 24 facing the inner tooth plate 3. In addition, in this embodiment, the concentric plate 2 is also provided with a concentric plate center hole 25, which is a hole to be opened to avoid interference with other components. In addition, the inner tooth plate 3 is arranged in a step shape, and the concentric plate 2 here is also arranged in a step shape, which can reduce the axial size of the core component and the depth of the sleeve 1.

[0035] When the inner tooth plate 3 rotates eccentrically relative to the outer tooth plate 4, the transmission boss 31 will move in the transmission hole 21 and drive the concentric plate 2 to rotate. Since the concentric plate 2 is concentrically arranged with the sleeve 1 and the outer tooth plate 4, the concentric plate 2 can only rotate around its central axis and will not make eccentric movements. In order to realize that the transmission boss 31 drives the concentric plate 2 to rotate, the transmission hole 21 needs to be arranged to ensure that the transmission boss 31 can be tangent to the transmission hole 21 during the movement, thereby transmitting torque to drive the concentric plate to rotate.

[0036] To achieve this purpose, the arrangement of the transmission boss 31 and the transmission hole 21 can be arranged according to a certain rule. Assuming that the transmission boss 31 is arranged at a distance D from the center of the inner tooth plate 3, when multiple transmission bosses 31 are set, the geometric centers of the multiple transmission bosses 31 are distributed on a circle with the center of the inner tooth plate 3 as the center and a diameter of D. Correspondingly, the transmission hole 21 is arranged on a circle with the center of the concentric plate 2 as the center and a diameter of D. In order to maintain tangency, it is also satisfied that: the inner contour of the transmission hole 21 (i.e. the contour of the hole wall) is equivalent to being formed by uniformly expanding outward by e on the basis of the outer contour of the transmission boss 31, where e is the eccentricity of the outer tooth plate 4 and the inner tooth plate 3.

[0037] Taking the transmission boss 31 in this embodiment as a circular boss as an example, the inner contour of the hole wall of the transmission hole 21 is formed by uniformly expanding the outer contour of the circular boss outward e. The outer contour of the circular boss is uniformly expanded outward and remains circular. The obtained transmission hole 21 is correspondingly a circular hole. The diameter of the circular boss is e, and the diameter after uniform expansion is d+2e. The diameter of the transmission hole 21 is d+2e. Of course, tolerance is allowed during actual assembly, which can be slightly larger than d+2e.

[0038] In addition, the shape and arrangement position of the transmission hole 21 can also be obtained by the envelope method to ensure that the transmission boss 31 can remain tangent to the hole wall of the transmission hole 21 during the movement process. Figure 6 It is the motion trajectory envelope diagram of the transmission boss 31 of the internal gear plate 3 in Example 1.

[0039] When the inner tooth plate 3 makes an eccentric motion, a motion track of the transmission boss 31 can be drawn. For example, the transmission boss 31 is at position 1 when it rotates 1 degree, at position 2 when it rotates 2 degrees, and at position n when it rotates n degrees. The positions of n transmission bosses 31 are superimposed to form Figure 6The motion trajectory shown, the motion trajectory of the transmission boss 31 defines the motion area of ​​the transmission boss 31 during the angle adjustment process of the angle adjuster, and the outer contour of the motion area defines a circular area. When the circular area corresponds to the concentric plate 2, it is used as the setting basis of the transmission hole 21. The transmission hole 21 and the circular area coincide with each other, and the diameter of the circular area is the diameter of the transmission hole 21. The center distance between the transmission boss 31 and the inner tooth plate 3 is equal to the center distance between the transmission hole 21 and the concentric plate 2, that is, they are distributed on a circle with a diameter of D. In this embodiment, d is 10.4mm, e is 1.3mm, and the circular area defined by the motion trajectory obtained by the envelope method has a diameter of 13mm, which is consistent with the conclusion obtained by the above d+2e method.

[0040] In this embodiment, a total of six transmission bosses 31 are provided, and six transmission holes 21 are provided accordingly. The transmission bosses 31 and the transmission holes 21 are evenly arranged along the inner tooth plate 3 and the concentric plate 2, respectively. During the angle adjustment process, each transmission boss 31 and the corresponding transmission hole 21 always remain tangent. It can be understood that the number of transmission holes 21 and transmission bosses 31 is not limited to six, but in theory, two or more transmission bosses 31 should be provided to ensure that one or more transmission bosses 31 can be tangent to the transmission hole 21 in the clockwise direction, and one or more transmission bosses 31 can be tangent to the counterclockwise direction. In the case of a small number, it is necessary to maintain tangency to stably realize the transmission function and drive the concentric plate 2 to rotate stably. For example, when two transmission holes 21 and transmission bosses 31 are provided, they can be symmetrically arranged relative to the center of the concentric plate 2 and the inner tooth plate 3. When three transmission holes 21 and transmission bosses 31 are provided, they can be evenly distributed along the circumference. In actual design, the number and distribution positions of the transmission holes 21 and the transmission bosses 31 can be reasonably determined based on transmission requirements, strength requirements, etc., and this solution does not impose any restrictions.

[0041] Example 2

[0042] like Figure 7 , 8 As shown, Figure 7 It is a schematic diagram of the transmission hole 21 of the concentric plate 2 being a blind hole in Embodiment 2; Figure 8 for Figure 7 sectional view of .

[0043] In Example 1, the transmission hole 21 is a through hole that penetrates the inner tooth plate 3. It should be known that the transmission hole 21 is set to utilize the tangential interference between its hole wall and the transmission boss 31 to drive the concentric plate 2 to rotate. Therefore, the transmission hole 21 is not limited to a through hole structure, and can also be a blind hole. As shown in Example 2, it is the same as Example 1, except that the transmission hole 21 is a blind hole structure, the hole end of the blind hole faces the transmission boss 31, and the transmission boss 31 is inserted in the blind hole to drive the concentric plate 2 to rotate. The other structures and principles are consistent with Example 1 and will not be repeated. Obviously, the transmission hole 21 is a blind hole and is also applicable to other embodiments.

[0044] In Examples 1 and 2, the concentric plate 2 is confined between the inner end face 11 of the sleeve and the outer end face 32 of the inner tooth plate, and is mounted on the transmission boss 31 of the inner tooth plate 3. A certain axial clearance is required between the concentric plate 2 and the inner tooth plate 3 and the sleeve 1 to ensure that the concentric plate 2 can rotate freely. Of course, the axial clearance should not be too large so as not to affect the meshing effect of the outer tooth plate 4 and the inner tooth plate 3. The axial clearance can be set to be less than 0.5 mm.

[0045] It should be noted that the above embodiment takes the transmission boss 31 as a circular boss as an example. In fact, the transmission boss 31 is not limited to a circular boss, and can be a boss of a regular geometric shape or an arbitrary special-shaped boss. Regardless of the shape of the transmission boss 31, the shape of the transmission hole 21 follows the above arrangement rule. That is, the geometric centers of the transmission hole 21 and the transmission boss 31 are distributed on a circle with a diameter of D, and the inner contour of the transmission hole 21 is formed by uniformly expanding the outer contour of the transmission boss 31 outward, or the inner contour of the transmission hole 21 is made according to the envelope method. The following embodiment also provides a scheme in which the transmission boss 31 and the transmission hole 21 are oval.

[0046] Example 3

[0047] Please refer to Fig. 9 , Fig. 9 It is an envelope diagram of the motion trajectory of the transmission boss 31 of the inner gear plate 3 of the angle adjuster in Example 3.

[0048] This embodiment is the same as the embodiment 1, except that the transmission boss 31 and the transmission hole 21 are both non-circular, the transmission boss 31 is an oblong boss, and the transmission hole 21 is a oblong hole accordingly. The shape of the transmission hole 21 is determined according to the motion trajectory of the transmission boss 31, the oblong transmission boss 31 is distributed on a circle with a diameter of D, the center of the circle is the center of the inner tooth plate 3, and the transmission hole 21 is also distributed on a circle with a diameter of D, the center of the circle is the center of the concentric plate 2. Of course, as mentioned above, in addition to determining the shape of the transmission hole 21 by the envelope method, the inner contour of the transmission hole 21 can also be determined as an oblong shape formed by uniformly expanding the outer contour of the transmission boss 31 outward.

[0049] Example 4

[0050] like Fig.10 , 11 As shown, Fig.10 It is a schematic diagram of setting a transmission boss 31 on the outer side plate of the angle adjuster in Example 4; Fig.11 for Fig.10 sectional view of .

[0051] In embodiments 1, 2, and 3, the outer tooth plate 4 is connected to the seat, the inner tooth plate 3 is connected to the backrest, and the inner tooth plate 3 moves eccentrically relative to the outer tooth plate 4. It can be understood that the angle adjustment is the relative rotation adjustment of the seat and the backrest. Accordingly, the inner tooth plate 3 and the outer tooth plate 4 are in a relative motion relationship, and the outer tooth plate 4 can also be connected to the backrest, while the inner tooth plate 3 is connected to the seat. Taking the seat as the reference system, the outer tooth plate 4 moves eccentrically relative to the inner tooth plate 3. At this time, it can be as follows Fig.10 , 11 As shown, the transmission boss 43 is arranged on the outer tooth plate 4, and the transmission hole 21 of the concentric plate 2 cooperates with the transmission boss 43 of the outer tooth plate 4. The working principle and the determination method of the transmission hole 21 are consistent with the above embodiment, except that the setting position of the transmission boss 43 is changed from the inner tooth plate 3 to the outer tooth plate 4, and the concentric plate 2 is between the outer tooth plate 4 and the sleeve 1. Fig.11 As shown, from left to right, there are inner tooth plate 3, outer tooth plate 4, concentric plate 2, and inner end face 12 of the sleeve. The inner tooth plate 3 is concentric with the sleeve 1 and the concentric plate 2. Specifically, the outer circle of the inner tooth plate and the inner circle 11 of the sleeve can be welded or riveted.

[0052] In addition, if Fig.10 As shown, similar to the embodiment 3, the transmission boss 43 provided on the outer tooth plate 4 is also in an oval shape, but the transmission hole 21 provided on the concentric plate 2 is not a complete oval shape, but a notch structure provided at the wall of the central hole of the concentric plate 2, that is, one side of the transmission hole 21 is open toward the center. Such a configuration can reduce the weight of the concentric plate, and the opening toward the center side is equivalent to removing the radially inward part, which does not affect the transmission of the circumferential transmission.

[0053] In combination with the above embodiments, it can be understood that the transmission hole 21 can be a complete hole shape (such as embodiments 1-3) or a hole shape with a notch (such as embodiment 4). If the transmission hole 21 has a complete hole shape, the entire outer contour of the transmission hole 21 is uniformly expanded outwards by e, and the entire inner contour of the transmission hole 21 is uniformly overlapped with the outer contour of the motion track area of ​​the transmission bosses 31 and 43. If the transmission hole 21 is a hole shape with a notch, the entire outer contour of the transmission hole 21 is partially overlapped with the outer contour of the transmission bosses 31 and 43 after being uniformly expanded outwards by e, or the entire inner contour of the transmission hole 21 is partially overlapped with the outer contour of the motion track area of ​​the transmission bosses 31 and 43, which is equivalent to removing a part of the contour determined by the above two methods as the entire inner contour of the transmission hole 21. The removed area should be necessary to ensure that the circumferential transmission is not affected, and to ensure that there are always at least two sets of tangent transmission bosses 31, 43 and the transmission hole 21 during the rotation process.

[0054] In the above-mentioned embodiments, a concentric plate 2 with a transmission hole 21 is provided, and the concentric plate 2 is connected to the backrest. Since the concentric plate 2 and the transmission bosses 21 and 43 are tangentially rolled and there is sufficient clearance in the radial direction, the radial movement of the transmission bosses 31 and 43 is filtered out by the transmission hole. Therefore, the concentric plate 2 only transmits pure rotation without eccentric movement. At this time, the concentric plate 2 converts the eccentric rotation of the inner tooth plate 3 or the outer tooth plate 4 into concentric rotation, that is, a concentric transmission angle adjuster is provided. In this way, during the angle adjustment process, the eccentric swing can be improved or even eliminated, thereby improving the user experience.

[0055] It is worth noting that in the above embodiments, the concentric plate 21 is concentric with the outer tooth plate 4 or concentric with the inner tooth plate 3. The setting principle is that when the outer tooth plate 4 moves relative to the inner tooth plate 3, the concentric plate 21 is concentric with the inner tooth plate 3, and the transmission boss 43 is set on the outer tooth plate; when the inner tooth plate 3 moves relative to the outer tooth plate 4, the concentric plate 21 is concentric with the outer tooth plate 3, and the transmission boss 31 is set on the inner tooth plate 3. That is, the concentric plate 21 is concentric with the relatively stationary one, and the transmission bosses 31 and 43 are set on the relatively moving one. In the above embodiments, the outer tooth plate 4 and the inner tooth plate 3, the relatively moving one is connected to the backrest, and the relatively stationary one is connected to the seat.

[0056] It should be noted that the above-mentioned concentric transmission angle adjuster can be used for adjusting the angle of other components in addition to the backrest. For example, it can also be used for the working condition that the seat basin four-bar linkage needs to be folded or the angle is adjusted. This article does not limit the application conditions of the concentric transmission angle adjuster. It can be summarized as follows: the car seat is provided with a first component and a second component whose angle is adjustable relative to the first component. The concentric plate 2 of the concentric transmission angle adjuster is connected to the second component, that is, the concentric plate 2 is connected to the component that needs to adjust the angle, and the outer tooth plate 4 or the inner tooth plate 3 that is concentrically arranged with the concentric plate 2 is connected to the first component. Then, for the above-mentioned embodiment, the first component is the seat, and the second component is the backrest; for another example, when used for the seat basin and the four-bar linkage, the four-bar linkage and the seat basin are the first component and the second component respectively.

[0057] The present solution also provides an embodiment of a car seat, wherein the car seat is provided with a recliner, and the recliner is the concentric transmission recliner described in any of the above embodiments, which will not be described in detail here.

[0058] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A concentric transmission angle adjuster, comprising an outer tooth plate and an inner tooth plate, which rotate eccentrically relative to each other, characterized in that: It also includes a concentric plate, which is arranged concentrically with the outer tooth plate, and the concentric plate is provided with a transmission hole, and the transmission boss is inserted into the transmission hole. When the transmission boss rotates, it can be tangent to the transmission hole to drive the concentric plate to rotate; the center of the inner tooth plate has a shoulder, and the middle of the outer tooth plate is provided with an axial hole, the shoulder is inserted into the axial hole, and the shoulder and the axial hole are eccentrically arranged; the inner tooth plate is arranged in a step shape; the angle adjuster also includes a sleeve, the outer edge of the outer tooth plate is fixedly connected to the inner circle of the sleeve, the concentric plate is arranged between the outer end face of the inner tooth plate and the inner end face of the sleeve, and the concentric plate is arranged in a step shape, and the step of the inner tooth plate is located in the step hole of the concentric plate; the concentric plate is also provided with a concentric plate center hole, and the concentric plate center hole is a let-off hole; The inner tooth plate is provided with the transmission boss, and the outer circle size of the concentric plate is larger than the outer circle size of the inner tooth plate; The transmission hole is in the shape of a notch with one side open, and the opening faces the center of the concentric plate.

2. The concentric transmission angle adjuster according to claim 1, characterized in that: The entire inner contour of the transmission hole is entirely or partially overlapped with the outer contour of the transmission boss after being uniformly expanded outwards.

3. The concentric transmission angle adjuster according to claim 2, characterized in that: The transmission boss is a circular boss with a diameter of d, and the transmission hole is a circular hole with a diameter of d+2e.

4. The concentric transmission angle adjuster according to claim 1, characterized in that: The entire inner contour of the transmission hole coincides entirely or partially with the outer contour of the motion track area of ​​the transmission boss.

5. The concentric transmission angle adjuster according to any one of claims 1 to 4, characterized in that: The number of the transmission bosses and the transmission holes is at least two, and at any position of the relative eccentric rotation of the inner tooth plate and the outer tooth plate, at least two of the transmission bosses are tangent to the corresponding transmission holes.

6. The concentric transmission angle adjuster according to claim 5, characterized in that: The transmission bosses and the transmission holes are evenly distributed along the circumferential direction.

7. A car seat, comprising a first component and a second component with an adjustable angle relative to the first component, and a recliner, wherein: The angle adjuster is the concentric transmission angle adjuster according to any one of claims 1 to 6, the concentric plate is connected to the second component, and the outer tooth plate or the inner tooth plate concentrically arranged with the concentric plate is connected to the first component.

8. The vehicle seat according to claim 7, characterized in that: The first component is the seat of the automobile seat, and the second component is the backrest.

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