Car seat concentric adjuster and its car seat

Abstract

A concentric angle adjuster for a car seat and the car seat thereof, comprising a seat toothed plate, with a seat toothed plate toothed ring cavity formed at the center of the right side, and a camshaft pivot left support hole formed at the center of the seat toothed plate toothed ring cavity; a seat back toothed plate receiving cavity formed on the left side of the seat back toothed plate control plate, with a camshaft pivot right support hole at the center of the seat back toothed plate, and a seat back toothed plate toothed ring cavity formed on the left side; a gear meshing with the seat toothed plate toothed ring and the seat back toothed plate toothed ring; and a gear drive mechanism cooperating with the gear; characterized in that the gear is a double gear composed of a left gear and a right gear integrally integrated with the right side of the left gear, the left gear meshing with the seat toothed plate toothed ring, and the right gear meshing with the seat back toothed plate toothed ring. Advantages: Enables the seat back toothed plate to achieve high-efficiency angle adjustment, ensures smooth meshing of the right gear with the seat back toothed plate toothed ring, avoids jerking and noise during adjustment, and demonstrates a good and compact structural effect.

Description

Technical Field

[0001] This utility model belongs to the technical field of automotive seat accessories, specifically relating to a concentric angle adjuster for automotive seats and the automotive seat thereof. Background Technology

[0002] Seat back adjusters come in two types: concentric and eccentric. The former doesn't rotate concentrically around a single point when adjusting the seat back; instead, it rotates with an eccentric offset, accompanied by a slight non-circular translation. This eccentric rotation causes not only horizontal forward / backward displacement but also vertical displacement, resulting in the unpleasant "nodding" or "wobbling" sensation of the car seat back. The latter, the concentric adjuster, surpasses the former in almost all key performance indicators. The rotation axes (centers) of the two adjusting units are strictly aligned on the same straight line. The seat back rotates around this physically aligned axis, resulting in smoother adjustment and better tactile feedback (when adjusting manually).

[0003] A typical example of a concentric angle adjuster structure in existing technology is as follows: a gear is installed between a seat toothed plate (also called an "inner toothed plate" or "stationary plate") fixed to the seat seat in use and a seat back toothed plate (also called an "outer toothed plate" or "moving plate") fixed to the seat back in use. A cam is disposed in the gear hole of the gear, and a clearance elimination mechanism (also called a "wedge block") is provided between the outer wall of the cam and the inner wall of the gear center hole. In use, the cam is driven by a drive rod of a manual or electric structure system, which in turn drives the gear. Since the outer toothed ring of the gear meshes with both the toothed rings of the seat toothed plate and the toothed rings of the seat back toothed plate, the gear rotates around the toothed ring of the seat toothed plate while simultaneously driving the seat back toothed plate to move, thereby adjusting the seat back angle to the desired degree by the occupant.

[0004] The concentric angle adjuster described above, because the number of teeth on the gear and the gear ring of the backrest gear plate tends to be the same, cannot increase or decrease efficiency, i.e., it cannot change the transmission efficiency. It is common knowledge that increasing the number of teeth on the gear ring of the backrest gear plate slows down the gear plate's rotation speed and correspondingly improves the adjustment accuracy, and vice versa. However, when the number of teeth on the gear ring of the backrest gear plate is particularly small or large, the aforementioned gear cannot mesh stably with it. Therefore, the number of teeth on the gear ring of the backrest gear plate cannot be too few or too many; it must take into account the situation of the gear meshing with it. Otherwise, it is aimless and impractical. Based on the above, once the outer diameter and number of teeth of the gear are determined, the adjustment speed of the backrest is constrained by the gear. Specifically, if the backrest gear plate is to achieve the desired transmission ratio to reflect efficient backrest adjustment, the aforementioned structure cannot meet this requirement unless substantial changes are made.

[0005] The concentric angle adjusters described above all involve welding or fastening the backrest tooth plate to the backrest frame, thus preventing both quick connection and non-destructive disassembly for repair and maintenance.

[0006] Based on the existing technologies mentioned above, it is necessary to make improvements. The technical solution to be introduced below was developed in this context. Utility Model Content

[0007] The purpose of this invention is to provide a car seat concentric angle adjuster that helps the gear meet the requirements of high-efficiency angle adjustment of the seat back gear plate, ensures the smooth meshing of the gear and the seat back gear plate, avoids jerking and noise during the adjustment process, and also reflects a good and compact structure.

[0008] Another objective of this invention is to provide a car seat concentric angle adjuster that facilitates quick and efficient detachable connection between the seat back plate and the seat back frame, thereby avoiding destructive disassembly during repair and maintenance, and is beneficial for saving resources and reducing maintenance costs during use.

[0009] Another objective of this invention is to provide a car seat that enables the full realization of the technical effects of the car seat concentric adjuster.

[0010] The present invention achieves its objective as follows: a concentric angle adjuster for a car seat includes a seat toothed plate, a seat toothed plate toothed ring cavity formed at the center of the right side of the seat toothed plate, a seat toothed plate toothed ring formed on the cavity wall and around the circumference of the cavity wall, and a camshaft pivoting left support hole formed at the center of the seat toothed plate toothed ring cavity; a seat back toothed plate control plate and a seat back toothed plate, the seat back toothed plate control plate having a central through hole, and the seat back toothed plate control plate being fixed to the right side of the seat toothed plate, a seat back toothed plate receiving cavity formed on the left side of the seat back toothed plate control plate, and a camshaft pivoting right support hole formed at the center of the seat back toothed plate, the four edges of the seat back toothed plate being rotatable. The seat toothed plate and the backrest toothed plate are fitted together, and the central area of ​​the seat toothed plate corresponds to the central through hole of the control plate. A seat toothed plate toothed plate toothed ring cavity is formed on the left side of the seat toothed plate, and a seat toothed plate toothed ring is formed on the cavity wall of the seat toothed plate toothed ring cavity and around the circumference of the cavity wall; a gear meshes with the seat toothed plate toothed ring and the back toothed plate toothed ring; a gear drive mechanism meshes with the gear and also meshes with the left and right pivot support holes of the camshaft; the characteristic is that the gear is a double gear composed of a left gear and a right gear integrally integrated with the right side of the left gear, the left gear meshes with the seat toothed plate toothed ring, and the right gear meshes with the back toothed plate toothed ring.

[0011] In a specific embodiment of this utility model, a gear hole is formed at the center of the gear, penetrating the left and right gears. A bushing is provided in the gear hole, and the gear drive mechanism cooperates with the bushing cavity of the bushing. A control plate welding flange is formed at the edge of the backrest tooth plate control plate and around the circumference of the backrest tooth plate control plate. The left side of the control plate welding flange is welded and fixed to the right side of the seat tooth plate. The seat tooth plate has a flat plate structure, and a seat tooth plate fixing hole is provided on the seat tooth plate for fixing the seat tooth plate to the seat of the car seat.

[0012] In another specific embodiment of this utility model, the outer diameter of the right gear is smaller than that of the left gear, and the number of teeth of the right gear is less than that of the left gear. The tooth pitch between any two adjacent teeth of the right gear is greater than that between any two adjacent teeth of the left gear. A gap-reducing, dustproof, noise-reducing, and flexible sealing ring is provided between the bottom wall of the cavity of the chair back tooth plate receiving cavity and the right side of the chair back tooth plate.

[0013] In another specific embodiment of this utility model, the gear drive mechanism includes a cam, a pair of wedges, and a spring. The cam is located in the bushing cavity. A camshaft pivot left support head extends from the left side of the cam, and a camshaft pivot right support head extends from the right side. The camshaft pivot left support head is rotatably supported in the camshaft pivot left support hole, and the camshaft pivot right support head is rotatably supported in the camshaft pivot right support hole. A camshaft drive hole is formed along the axial direction at the axial center position of the cam, extending from the camshaft pivot left support head to the camshaft pivot right support head. A pair of wedges are disposed in the cam wedge mating cavity formed on the cam, and the outer peripheral surfaces of the pair of wedges are in contact with the cavity wall of the bushing cavity, while the inner peripheral surfaces of the pair of wedges are in contact with the cavity wall of the cam wedge mating cavity. The spring is disposed between the opposing ends of the pair of wedges.

[0014] In another specific embodiment of this utility model, the camshaft drive hole is a spline hole, a square hole, or a regular hexagonal hole.

[0015] Another objective of this invention is achieved by fixing a backrest connecting shaft in a horizontal cantilever state at a position corresponding to the middle area of ​​the right side of the backrest toothed plate, for connecting the backrest toothed plate to the backrest frame.

[0016] In another specific embodiment of this utility model, a backrest connecting shaft hole positioning reference insert is formed in the middle region of the right side of the backrest toothed plate and at the position corresponding to the left end of the backrest connecting shaft. The backrest connecting shaft is composed of a circular shaft segment with a circular cross-sectional shape at the left end and a quadrilateral shaft segment with a square or rectangular cross-sectional shape at the right end. The left end of the circular shaft segment cooperates with the backrest connecting shaft hole positioning reference insert and is also welded and fixed to the right side of the backrest toothed plate. A backrest connecting shaft limiting member insertion hole is provided on the quadrilateral shaft segment and at the right end of the quadrilateral shaft segment for limiting the backrest connecting shaft to the backrest frame.

[0017] In a further specific embodiment of this utility model, a circular shaft segment welding flange edge is formed at the left end of the circular shaft segment and around the circumference of the circular shaft segment. The left side of the circular shaft segment welding flange edge is welded and fixed to the middle area of ​​the right side of the chair back tooth plate. A notch for limiting the foot is provided on the circular shaft segment welding flange edge at the position corresponding to the positioning reference foot of the chair back connecting shaft hole. The positioning reference foot of the chair back connecting shaft hole cooperates with the notch for limiting the foot.

[0018] In a further specific embodiment of this utility model, the number of the positioning reference feet for the chair back connecting shaft hole is two or three, and the number of notches defined by the feet is equal to the number of positioning reference feet for the chair back connecting shaft hole. Specifically, when there are two positioning reference feet for the chair back connecting shaft hole, the two positioning reference feet for the chair back connecting shaft hole are 180° apart from each other on the right side of the chair back toothed plate in the circumferential direction around the chair back toothed plate; when there are three positioning reference feet for the chair back connecting shaft hole, the three positioning reference feet for the chair back connecting shaft hole are 120° apart from each other on the right side of the chair back toothed plate in the circumferential direction around the chair back toothed plate.

[0019] Another objective of this invention is to provide a car seat having the car seat concentric adjuster.

[0020] One of the technical effects of the present invention is that, by constructing the gears as a double gear consisting of a left gear and a right gear, and by having the left gear mesh with the seat toothed plate toothed plate and the right gear mesh with the back toothed plate toothed plate, the double gears satisfy the requirement for high-efficiency angle adjustment of the back toothed plate. This also ensures the smooth meshing of the right gear with the back toothed plate toothed plate, avoiding jerking and noise during adjustment, and demonstrating a compact and efficient structure. Secondly, the innovative use of a backrest connecting shaft fixed to the back toothed plate allows for quick and efficient detachable connection between the back toothed plate and the backrest frame, avoiding destructive disassembly of the car seat concentric angle adjuster during maintenance and repair, thus saving resources and reducing maintenance costs. Thirdly, the provided car seat fully embodies the aforementioned technical effects of the car seat concentric angle adjuster. Attached Figure Description

[0021] Figure 1 This is a structural diagram of an embodiment of the present utility model; Figure 2 for Figure 1 A schematic diagram after assembly.

[0022] In the diagram: 1. Seat gear plate, 11. Seat gear plate gear ring cavity, 111. Seat gear plate gear ring, 112. Camshaft pivot left support hole, 12. Seat gear plate fixing hole; 2. Backrest gear plate control plate, 21. Control plate central through hole, 22. Backrest gear plate receiving cavity, 221. Backlash-free, dustproof, noise-reducing, and compliant sealing ring, 23. Control plate welding flange edge; 3. Backrest gear plate, 31. Camshaft pivot right support hole, 32. Backrest gear plate gear ring cavity, 321. Backrest gear plate gear ring, 33. Backrest connecting shaft hole positioning reference foot; 4. Gear, 41. Left gear, 42. Right gear, 43. Gear hole, 431. Bushing, 4311. Bushing cavity; 5. Gear drive mechanism, 51. Cam, 511. 512. Camshaft pivot left support shaft head; 513. Camshaft pivot right support shaft head; 514. Camshaft drive hole; 515. Cam wedge block mating cavity; 52. Wedge block; 53. Spring; 6. Chair back connecting shaft; 61. Round shaft section; 611. Round shaft section welded flange edge; 6111. Embedded foot limiting notch; 62. Quadrilateral shaft section; 621. Chair back connecting shaft limiting insert hole. Detailed Implementation

[0023] In order to better understand the technical essence and beneficial effects of this utility model, the following detailed description is provided 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 seat toothed plate 1, with a circular seat toothed plate tooth ring cavity 11 formed at the center of the right side of the seat toothed plate 1. A seat toothed plate tooth ring 111 is formed on the cavity wall of the seat toothed plate tooth ring cavity 11 and around the circumference of the cavity wall. A camshaft pivot left support hole 112 is formed at the center of the seat toothed plate tooth ring cavity 11. The diagram also shows a backrest toothed plate control plate 2 and a backrest toothed plate 3. The backrest toothed plate control plate 2 has a central through hole 21 and is fixed to the right side of the aforementioned seat toothed plate 1. A circular backrest toothed plate receiving cavity 22 is formed on the left side of the backrest toothed plate control plate 2. A protrusion is formed at the center of the backrest toothed plate 3. The right support hole 31 of the wheel axle pivots, and the four edges of the backrest toothed plate 3 rotatably engage with the backrest toothed plate receiving cavity 22. The central area of ​​the backrest toothed plate 3 corresponds to the central through hole 21 of the control plate. A backrest toothed plate toothed ring cavity 32 is formed on the left side of the backrest toothed plate 3. A backrest toothed plate toothed ring 321 is formed on the cavity wall of the backrest toothed plate toothed ring cavity 32 and around the circumference of the cavity wall. A gear 4 is shown, which meshes with the aforementioned seat toothed plate toothed ring 111 and the backrest toothed plate toothed ring 321. A gear drive mechanism 5 is shown, which engages with the aforementioned gear 4 and also pivotally engages with the aforementioned left and right support holes 112 and 31 of the camshaft.

[0026] The key technical points of the technical solution provided by this utility model are as follows: the aforementioned gear 4 is a double gear composed of a left gear 41 and a right gear 42 integrally connected to the right side of the left gear 41. The left gear 41 meshes with the aforementioned seat tooth plate gear ring 111, while the right gear 42 meshes with the aforementioned back tooth plate gear ring 321.

[0027] As can be seen from the above description, compared with the prior art, this utility model, due to the use of a double gear with a changeable transmission ratio, achieves excellent transmission effect and improves the adjustment efficiency of the chair back with a simple and efficient structure, that is, without increasing the number of parts. It faithfully realizes one of the technical effects recorded in the above technical effect section. Specifically, since the double gear 4 uses a two-stage external meshing disc gear transmission, the efficiency of each stage can reach a satisfactory level, resulting in high overall system efficiency and reduced motor load (under the premise of electric drive gear drive mechanism 5). A smaller, lighter, and cheaper drive motor can be selected; energy consumption is lower, which helps reduce low-voltage system power consumption and extend battery life for the increasing number of electric vehicles in society. As for manual operation, i.e., the gear drive mechanism 5 driven by the handle, the operation feels light and smooth. In addition, since gear 4 is an integrated double gear, it can eliminate the gaps and micro-movements that exist when multiple gears are assembled separately. Furthermore, the design of gear 4 as a double gear in this invention has excellent rigidity, and its torsional stiffness, bending stiffness, and strength are significantly improved, so there is almost no deformation problem in the transmission chain.

[0028] A gear hole 43 is formed at the center of the aforementioned gear 4, passing through the aforementioned left gear 41 and right gear 42. A bushing 431 is provided in the gear hole 43, and the aforementioned gear drive mechanism 5 cooperates with the bushing cavity 4311 of the bushing 431. A control plate welding flange edge 23 is formed at the edge of the aforementioned backrest tooth plate control plate 2 and around the circumference of the backrest tooth plate control plate 2. The left side of the control plate welding flange edge 23 is welded and fixed to the right side of the aforementioned seat tooth plate 1. The aforementioned seat tooth plate 1 has a flat plate structure that tends to be elliptical. A seat tooth plate fixing hole 12 is provided on the seat tooth plate 1 for fixing the seat tooth plate 1 to the seat of the car seat.

[0029] The outer diameter of the aforementioned right gear 42 is smaller than the outer diameter of the aforementioned left gear 41, and the number of teeth of the right gear 42 is less than the number of teeth of the left gear 41. The tooth pitch between any two adjacent teeth of the right gear 42 is greater than the tooth pitch between any two adjacent teeth of the left gear 41. A gap-reducing, dust-proof, noise-reducing, and flexible sealing ring 221 is provided between the bottom wall of the aforementioned backrest tooth plate receiving cavity 22 and the right side surface of the aforementioned backrest tooth plate 3. The aforementioned gap-reducing, dust-proof, noise-reducing, and flexible sealing ring 221 is preferably, but not limited to, a rubber ring, such as a fluororubber ring, an EPDM rubber ring, a nitrile rubber ring, or a silicone rubber ring, etc.

[0030] See you later Figure 1The aforementioned gear drive mechanism 5 includes a cam 51, a pair of wedge blocks 52, and a spring 53. The cam 51 is located within the aforementioned bushing cavity 4311. A camshaft pivot left support head 511 extends from the left side of the cam 51, while a camshaft pivot right support head 512 extends from the right side. The camshaft pivot left support head 511 is rotatably supported within the aforementioned camshaft pivot left support hole 112, while the camshaft pivot right support head 512 is rotatably supported within the aforementioned camshaft pivot right support hole 31. A camshaft drive hole 513 is formed along the axial direction at the central position, extending from the aforementioned left pivot support shaft head 511 to the right pivot support shaft head 512 of the camshaft. A pair of wedge blocks 52 are disposed in the cam wedge block mating cavity 514 formed on the cam 51, and the outer peripheral surface of the pair of wedge blocks 52 is in contact with the cavity wall of the aforementioned bushing cavity 4311, while the inner peripheral surface of the pair of wedge blocks 52 is in contact with the cavity wall of the aforementioned cam wedge block mating cavity 514. A spring 53 is disposed between the opposing ends of the pair of wedge blocks 52.

[0031] Each of the pair of wedge blocks 52 has a spring support cavity at its opposite end, i.e., the end facing the spring 53. The spring 53 is supported in the aforementioned spring support cavity at the opposite end of the pair of wedge blocks 52. The spring 53 serves to spread the pair of wedge blocks 52 apart, so that the outer peripheral surfaces of the pair of wedge blocks 52 can fully contact (i.e., fully contact or fit) the cavity wall of the bushing cavity 4311. In this way, when the cam 51 is rotated by an external force, it drives (or "push") the pair of wedge blocks 52 to rotate, compressing the spring 53. This, in turn, causes the gear drive mechanism 5 of the eccentric cam assembly to rotate as a whole, driving the gear 4. Thus, the engagement of the right gear 42 with the gear ring 321 of the chair back gear plate drives the chair back gear plate 3 to move. The aforementioned arrangement of a pair of wedge blocks 52 is, for example, installed in the cam wedge block mating cavity 514, with the inner peripheral surfaces of the pair of wedge blocks 52 in contact with the cavity wall of the cam wedge block mating cavity 514, and the outer peripheral surfaces in contact with the cavity wall of the bushing cavity 4311, thereby reducing driving resistance.

[0032] In this embodiment, the aforementioned camshaft drive hole 513 is a spline hole. However, if it is changed to a regular square hole or a regular hexagonal hole, the shaft that cooperates with the camshaft drive hole 513 to drive the cam 51 will also be adapted accordingly. In this case, it should be considered a formal rather than a substantive change, and it still does not deviate from the scope of the technical connotation disclosed in this utility model.

[0033] A backrest connecting shaft 6, used to connect the backrest toothed plate 3 to the backrest frame, is fixed in a horizontal cantilevered manner at the middle region of the right side of the aforementioned backrest toothed plate 3. A backrest connecting shaft hole positioning reference insert 33, protruding from the right side of the backrest toothed plate 3, is formed at the middle region of the right side of the aforementioned backrest toothed plate 3 and at the left end of the aforementioned backrest connecting shaft 6. The aforementioned backrest connecting shaft 6 is composed of a circular shaft segment 61 with a circular cross-sectional shape at the left end and a quadrilateral shaft segment 62 with a square (or rectangular) cross-sectional shape at the right end. The left end of the aforementioned circular shaft segment 61 mates with the aforementioned backrest connecting shaft hole positioning reference insert 33 and is simultaneously welded and fixed to the right side of the aforementioned backrest toothed plate 3. A backrest connecting shaft limiting insert hole 621, used to limit the backrest connecting shaft 6 to the backrest frame, is provided on the quadrilateral shaft segment 62 at its right end.

[0034] Preferably, a circular shaft segment welding flange edge 611 is formed at the left end of the aforementioned circular shaft segment 61 and around the circumference of the circular shaft segment 61. The left side of the circular shaft segment welding flange edge 611 is welded and fixed to the middle area of ​​the right side of the aforementioned chair back tooth plate 3. A notch 6111 is provided on the circular shaft segment welding flange edge 611 at a position corresponding to the aforementioned chair back connecting shaft hole positioning reference notch 33. The chair back connecting shaft hole positioning reference notch 33 cooperates with the notch 6111.

[0035] In this embodiment, the number of the aforementioned chair back connecting shaft hole positioning reference feet 33 is two, but it can also be three. The number of the aforementioned foot limiting notches 6111 is equal to the number of chair back connecting shaft hole positioning reference feet 33. When the number of chair back connecting shaft hole positioning reference feet 33 is two, the two chair back connecting shaft hole positioning reference feet 33 are 180° apart from each other on the right side of the aforementioned chair back toothed plate 3 in the circumferential direction around the chair back toothed plate 3. When the number of chair back connecting shaft hole positioning reference feet 33 is three, the three chair back connecting shaft hole positioning reference feet 33 are 120° apart from each other on the right side of the aforementioned chair back toothed plate 3 in the circumferential direction around the chair back toothed plate 3.

[0036] The positive significance of the aforementioned chair back connecting shaft hole positioning reference foot 33 is that: since the position of the chair back connecting shaft limiting member insertion hole 621 (i.e. chair back connecting shaft limiting member insertion hole) on the quadrilateral shaft segment 62 (also called "square shaft segment") of the chair back connecting shaft 6 needs to correspond with the position on the chair back frame where the chair back connecting shaft limiting member can be conveniently inserted, or in other words, it needs to correspond with the chair back connecting shaft limiting member such as locking pin or similar pin or bolt pre-set on the chair back frame, the positioning of the chair back connecting shaft 6 needs to be achieved by the cooperation of the chair back connecting shaft hole positioning reference foot 33 and the foot limiting notch 6111 to achieve accurate pre-positioning.

[0037] This utility model employs a chair back connecting shaft 6, faithfully realizing the second technical effect described by the applicant in the above-mentioned technical effect section. Specifically, it enables this utility model to embody a modular effect because the rigid welding of the chair back tooth plate 3 to the chair back frame in the prior art is replaced by using one end of the chair back connecting shaft 6 (e.g., Figure 1 The left end shown is welded to the backrest toothed plate 3, while the other end of the backrest connecting shaft 6 is as shown. Figure 1 The right end shown is inserted into the chair back frame, and after insertion, the aforementioned pin is inserted into the chair back connecting shaft limiting hole 621, forming a reliable torque transmission path while maintaining detachability. This avoids the need for welding to connect to the chair back frame, greatly simplifying repair and maintenance.

[0038] Please see Figure 2 And combined Figure 1 , Figure 2 for Figure 1 The chair is ready for use after assembly. In use, the seat tooth plate 1 is fixed to the chair frame, such as the seat basin, with bolts at the positions corresponding to a set of seat tooth plate fixing holes 12. The backrest connecting shaft 6 is inserted into the insertion hole of the corresponding component on the chair frame for receiving the backrest connecting shaft 6. Then, the aforementioned pin or other similar component is inserted into the backrest connecting shaft 6 at the position corresponding to the backrest connecting shaft limiting insertion hole 621, thereby reliably securing the seat connecting shaft to the backrest.

[0039] Taking the electric drive mode as an example, the drive shaft of the electric drive mechanism, which matches the hole shape of the camshaft drive hole 513, rotates the cam 51, which in turn rotates the gear 4 as described above. The left gear 41 rotates around the seat gear ring 111, while the right gear 42 drives the backrest gear plate 3 to rotate via the meshing backrest gear ring 321. Since the left end of the round shaft section 61 of the backrest connecting shaft 6 is welded to the right side of the backrest gear plate 3 via its round shaft welding flange edge 611, the backrest gear plate 3 drives the backrest connecting shaft 6, and ultimately the backrest connecting shaft 6 drives the backrest, causing the backrest to tilt forward or backward. This forward or backward adjustment depends on the forward and reverse rotation of the motor of the aforementioned electric drive mechanism. Furthermore, electric operation typically involves control buttons, such as touch buttons or corresponding switches, located in appropriate positions on the car seat armrest. Manual operation is achieved by manipulating a handle or rotating disc. Since the transmission relationship during adjustment is similar to the electric or automatic mode of the electric drive mechanism, the applicant will not elaborate further. Furthermore, based on common knowledge, for a single car seat, this utility model's car seat concentric adjuster has one on each side of the car seat, meaning there is one pair per car seat. However, the aforementioned electric drive mechanism only requires one set, and the manual adjustment handle is similar. Furthermore, based on professional knowledge, in a pair of car seat concentric adjusters, the camshaft drive hole 513 of the cam 51 of the aforementioned cam drive mechanism 5 accompanying the electric or manual drive mechanism extends from the left pivot support shaft head 511 of the camshaft to the right pivot support shaft head 512 of the camshaft. In contrast, the camshaft drive hole 513 of the cam 51 of the cam drive mechanism 5 of the other car seat concentric adjuster can be a blind hole, i.e., it does not penetrate the left pivot support shaft head 511 of the camshaft.

[0040] This utility model also relates to an automobile seat, which has the aforementioned automobile seat concentric angle adjuster, thereby realizing the third technical effect recorded by the applicant in the above technical effect column.

[0041] In summary, the technical solution provided by this utility model makes up for the shortcomings of the prior art, successfully completes the utility model task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. A concentric angle adjuster for a car seat, comprising a seat tooth plate (1), a seat tooth plate tooth ring cavity (11) formed at the center of the right side of the seat tooth plate (1), a seat tooth plate tooth ring (111) formed on the cavity wall of the seat tooth plate tooth ring cavity (11) and around the cavity wall in a circumferential direction, and a camshaft pivot left support hole (112) formed at the center of the seat tooth plate tooth ring cavity (11); a backrest tooth plate control plate (2) and a backrest tooth plate (3), the backrest tooth plate control plate (2) having a control plate central through hole (21), and the backrest tooth plate control plate (2) being fixed to the right side of the seat tooth plate (1), a backrest tooth plate receiving cavity (22) formed on the left side of the backrest tooth plate control plate (2), and a backrest tooth plate having a central through hole (21) at the center of the backrest tooth plate (3). A camshaft pivot right support hole (31) is provided, and the periphery of the backrest toothed plate (3) rotatably engages with the backrest toothed plate receiving cavity (22). The central area of ​​the backrest toothed plate (3) corresponds to the central through hole (21) of the control plate. A backrest toothed plate toothed ring cavity (32) is formed on the left side of the backrest toothed plate (3), and a backrest toothed plate toothed ring (321) is formed on the cavity wall of the backrest toothed plate toothed ring cavity (32) and around the circumference of the cavity wall; a gear (4) meshes with the seat toothed plate toothed ring (111) and the backrest toothed plate toothed ring (321); a gear drive mechanism (5) engages with the gear (4) and also pivotally engages with the camshaft pivot left and right support holes (112, 31); characterized in that: The gear (4) is a double gear consisting of a left gear (41) and a right gear (42) integrally connected to the right side of the left gear (41). The left gear (41) meshes with the toothed ring (111) of the seat toothed plate, while the right gear (42) meshes with the toothed ring (321) of the back toothed plate.

2. The car seat concentric angle adjuster according to claim 1, characterized in that: A gear hole (43) is formed at the center of the gear (4) through the left gear (41) and the right gear (42). A bushing (431) is provided in the gear hole (43). The gear drive mechanism (5) cooperates with the bushing cavity (4311) of the bushing (431). A control plate welding flange edge (23) is formed at the edge of the backrest tooth plate control plate (2) and around the circumference of the backrest tooth plate control plate (2). The left side of the control plate welding flange edge (23) is welded and fixed to the right side of the seat tooth plate (1). The seat tooth plate (1) has a flat plate structure. A seat tooth plate fixing hole (12) is provided on the seat tooth plate (1) for fixing the seat tooth plate (1) to the seat of the car seat.

3. The car seat concentric angle adjuster according to claim 1, characterized in that: The outer diameter of the right gear (42) is smaller than that of the left gear (41), and the number of teeth of the right gear (42) is less than that of the left gear (41). The tooth pitch between any two adjacent teeth of the right gear (42) is greater than that between any two adjacent teeth of the left gear (41). A gap-reducing, dustproof, noise-resistant, and flexible sealing ring (221) is provided between the bottom wall of the backrest tooth plate receiving cavity (22) and the right side surface of the backrest tooth plate (3).

4. The car seat concentric angle adjuster according to claim 2, characterized in that: The gear drive mechanism (5) includes a cam (51), a pair of wedge blocks (52), and a spring (53). The cam (51) is located within the bushing cavity (4311). A camshaft pivot left support head (511) extends from the left side of the cam (51), while a camshaft pivot right support head (512) extends from the right side. The camshaft pivot left support head (511) is rotatably supported within the camshaft pivot left support hole (112), while the camshaft pivot right support head (512) is rotatably supported within the camshaft pivot right support hole (31). A camshaft drive hole (513) is formed along the axial center position, extending from the left pivot support shaft head (511) of the camshaft to the right pivot support shaft head (512) of the camshaft. A pair of wedge blocks (52) are disposed in the cam wedge block mating cavity (514) formed on the cam (51), and the outer peripheral surface of the pair of wedge blocks (52) is in contact with the cavity wall of the bushing cavity (4311), while the inner peripheral surface of the pair of wedge blocks (52) is in contact with the cavity wall of the cam wedge block mating cavity (514). A spring (53) is disposed between the opposing ends of the pair of wedge blocks (52).

5. The car seat concentric angle adjuster according to claim 4, characterized in that: The camshaft drive hole (513) is a spline hole, a square hole, or a regular hexagonal hole.

6. The car seat concentric angle adjuster according to claim 1, characterized in that: A backrest connecting shaft (6) for connecting the backrest tooth plate (3) to the backrest frame is fixed in a horizontal cantilever state at the position corresponding to the middle area of ​​the right side of the backrest tooth plate (3).

7. The concentric angle adjuster for automobile seats according to claim 6, characterized in that: In the middle region of the right side of the backrest toothed plate (3) and at the position corresponding to the left end of the backrest connecting shaft (6), a backrest connecting shaft hole positioning reference insert (33) protruding from the right side of the backrest toothed plate (3) is formed. The backrest connecting shaft (6) is composed of a circular shaft segment (61) with a circular cross-sectional shape at the left end and a quadrilateral shaft segment (62) with a square or rectangular cross-sectional shape at the right end. The left end of the circular shaft segment (61) cooperates with the backrest connecting shaft hole positioning reference insert (33) and is also welded and fixed to the right side of the backrest toothed plate (3). On the quadrilateral shaft segment (62) and at the right end of the quadrilateral shaft segment (62), a backrest connecting shaft limiting insert (621) for limiting the backrest connecting shaft (6) to the backrest frame is provided.

8. The concentric angle adjuster for automobile seats according to claim 7, characterized in that: A circular shaft welding flange edge (611) is formed at the left end of the circular shaft segment (61) and around the circumference of the circular shaft segment (61). The left side of the circular shaft welding flange edge (611) is welded and fixed to the middle area of ​​the right side of the chair back tooth plate (3). A notch limiting the foot (6111) is provided on the circular shaft welding flange edge (611) at the position corresponding to the positioning reference foot (33) of the chair back connecting shaft hole. The positioning reference foot (33) of the chair back connecting shaft hole cooperates with the notch limiting the foot (6111).

9. The concentric angle adjuster for automobile seats according to claim 8, characterized in that: The number of the positioning reference feet (33) for the backrest connecting shaft hole is two or three, and the number of the foot limiting notches (6111) is equal to the number of the positioning reference feet (33) for the backrest connecting shaft hole. When there are two positioning reference feet (33) for the backrest connecting shaft hole, the two positioning reference feet (33) for the backrest connecting shaft hole are 180° apart from each other on the right side of the backrest tooth plate (3) in the circumferential direction around the backrest tooth plate (3). When there are three positioning reference feet (33) for the backrest connecting shaft hole, the three positioning reference feet (33) for the backrest connecting shaft hole are 120° apart from each other on the right side of the backrest tooth plate (3) in the circumferential direction around the backrest tooth plate (3).

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

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