Self-locking rotating shaft of automobile rear row deformation seat

Abstract

The utility model provides a self-locking rotating shaft of an automobile rear row deformation seat, which is characterized by comprising a locking button, a central rotating shaft, a first rotating shaft sleeve and a second rotating shaft sleeve, and the first rotating shaft sleeve and the second rotating shaft sleeve are respectively and fixedly arranged on a backrest and a base of the seat. The first rotating shaft sleeve and the second rotating shaft sleeve can be locked through the locking button, so that the first rotating shaft sleeve and the second rotating shaft sleeve cannot rotate relatively; the self-locking rotating shaft is arranged on the child safety seat of the automobile rear-row deformation seat, is fixed between the backrest and the base, can be easily loosened and locked through the locking button, is convenient to adjust the inclination angle of the backrest of the child safety seat, can be easily locked after being adjusted, and cannot easily rotate.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile child seats, in particular to a self-locking rotating shaft of a rear-row deformable seat of an automobile. Background Art

[0002] With the development of society and the improvement of people's living standards, cars are becoming an increasingly important means of transportation for people to travel. When traveling, when there are children in the car, in order to improve driving safety, car child seats are often installed on the back seats of the car to improve driving safety.

[0003] In the prior art, child work seats are usually additional equipment. Because of the space they occupy, they often need to be loaded and unloaded as needed, which inconveniences affect the user's use. In addition, as children grow older, child seats also need to be replaced. In order to make the use of child seats more convenient and encourage parents to use them more, a child seat integrated on the driver's rear seat is designed. However, this child safety seat is expected to be able to adapt to the use of children of different ages, so the backrest angle of the child safety seat needs to be adjusted according to the actual situation of the child's body shape, and in order to protect the child, the backrest should also have a self-locking function after the angle is adjusted to ensure that the backrest will not rotate easily. Utility Model Content

[0004] The utility model aims to provide a self-locking rotating shaft for a rear deformable seat of a car to solve the problem that the backrest of a child work seat is inconvenient to adjust the angle according to the age, and the backrest of a child safety seat is not stable enough after the angle is adjusted.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A self-locking shaft of a rear deformable seat of an automobile comprises a locking button 051, a central shaft 052, a first shaft sleeve 053 and a second shaft sleeve 054, wherein the locking button 051 is fixed to one end of the central shaft 052 and is also fixed to the side of a child safety seat 001; two second shaft sleeves 054 are provided, which are respectively located on both sides of the central shaft 052, the first shaft sleeve 053 is located in the middle of the central shaft 052, and the first shaft sleeve 053 and the second shaft sleeve 054 can rotate around the central shaft 052; the central shaft 052 is cooperatively connected with the child safety seat 001 at the connection between the backrest and the base, and a spring 055 is provided on the side away from the locking button 051; the first shaft sleeve 053 and the second shaft sleeve 054 can be locked by the locking button 051 so that they will not rotate relative to each other.

[0007] A connecting plate 056 is fixedly installed on the first rotating shaft sleeve 053 and the second rotating shaft sleeve 054 to assist in fixing the child seat backrest 013 and the child seat base 011 of the child safety seat 001, wherein the connecting plates 056 on the two first rotating shaft sleeves 053 are fixed on the child seat base 011, and the connecting plates 056 on the second rotating shaft sleeve 054 are fixed on the backrest of the child seat backrest 013.

[0008] A first tooth-shaped groove 0531 and a second tooth-shaped groove 0541 are respectively provided on the inner surface of the connection between the first rotating shaft sleeve 053 and the second rotating shaft sleeve 054 near one end of the locking button 051, and a tooth-shaped protrusion 0521 is provided on the corresponding position of the central rotating shaft 052, wherein the length of the first tooth-shaped groove 0531 on the inner surface of the first rotating shaft sleeve 053 can completely fit the tooth-shaped protrusion 0521 on the central rotating shaft 052;

[0009] The spring 055 pushes the central rotating shaft 052 toward the locking button 051. When the locking button 051 is pressed, the entire central rotating shaft 052 moves toward the spring 055. At this time, the tooth-shaped protrusions 0521 on the central rotating shaft 052 all slide into the first tooth-shaped grooves 0531 of the first rotating shaft sleeve 053. At this time, there is no restriction of the tooth-shaped protrusions 0521 between the first tooth-shaped grooves 0531 and the second tooth-shaped grooves 0541, and the first rotating shaft sleeve 053 and the second rotating shaft sleeve 054 can be locked. After relative rotation is adjusted to the desired angle, the locking button 051 is released, and the entire central shaft 052 moves toward the locking button 051 under the action of the spring 055. At this time, the toothed protrusion 0521 on the central shaft 052 is inserted into the first toothed groove 0531 and the second toothed groove 0541 of the first shaft sleeve 053 and the second shaft sleeve 054. At this time, the first shaft sleeve 053 and the second shaft sleeve 054 are stuck by the toothed protrusion 0521 and cannot rotate relative to each other, thereby achieving locking.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] The self-locking rotating shaft provided by the utility model can adjust the backrest angle of the child safety seat through simple operation, and at the same time has a self-locking function after adjustment, thereby ensuring that the backrest of the child safety seat will not deviate in angle after the angle is adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic diagram of the overall structure of a child safety seat in an embodiment;

[0013] Figure 2 Schematic diagram of the internal structure of the base guardrail, back guardrail and pillow of the child seat in the embodiment;

[0014] Figure 3 This is a schematic diagram of the principle of the steering mechanism of the servo driving the angle change between the base guardrail and the base in the embodiment;

[0015] Figure 4 This is a schematic diagram of the principle of the steering mechanism of the servo driving the angle change between the backrest guardrail and the backrest in the embodiment;

[0016] Figure 5 A schematic diagram of the principle of the steering mechanism of the steering gear driving the angle change between the two sides of the headrest and the main body in the embodiment;

[0017] Figure 6 This is a schematic diagram of the lockable shaft structure of the utility model;

[0018] Figure 7 This is a partial cross-sectional view of the lockable rotating shaft of the utility model;

[0019] Figure 8 This is one of the schematic diagrams of the lifting platform structure in the embodiment;

[0020] Fig. 9 This is the second schematic diagram of the lifting platform structure in the embodiment;

[0021] Fig.10 This is the third schematic diagram of the lifting platform structure in the embodiment;

[0022] Fig.11 A schematic diagram of a child seat in an embodiment being folded and lowered into an adult seat base;

[0023] Fig.12 It is a schematic diagram of the structure of the child seat after being folded and the separation layer is buckled in the embodiment;

[0024] Fig.13 It is a schematic diagram of a child seat after the child seat servo drives the base guardrail, back guardrail and headrest of the child seat to be folded in the embodiment;

[0025] Fig.14 This is a cross-sectional view of the self-locking shaft of the utility model when the angle cannot be adjusted after the locking button is pressed;

[0026] Fig.15 This is a cross-sectional view of the self-locking shaft of the utility model when the angle can be adjusted after the locking button is released. DETAILED DESCRIPTION

[0027] In order to clarify the technical problems, technical solutions, implementation processes and performance demonstrations, the utility model is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are for explanation only. The utility model is not intended to limit the utility model. Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same figure numbers in the drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings do not have to be drawn to scale unless otherwise specified.

[0028] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0029] In addition, in order to better illustrate the present disclosure, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present disclosure can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present disclosure.

[0030] Example 1

[0031] like Figure 1As shown, a deformable rear seat of a car includes an adult seat 002 and a deformable child safety seat 001, wherein the adult seat 002 includes an adult seat base 021 and an adult seat backrest 022, and the child safety seat 001 includes a child seat base 011, a base guardrail 012, a child seat backrest 013, a back guardrail 014 and a pillow 015, and the bottom of the child safety seat 001 is fixedly connected to a lifting platform 003, and the lifting platform 003 is installed at the bottom of the adult seat base 021; when the child safety seat 001 is not in use, the base guardrail 012, the back guardrail 014 and the pillow 015 are folded inwardly, so that the base guardrail 012 and the child seat base 011 are on the same horizontal plane, the back guardrail 014 and the child seat backrest 013 are on the same horizontal plane, and the two sides of the pillow 015 are folded inwardly. The side is also close to the same plane with the main body, and then the child seat backrest 013 is buckled into the same plane as the child seat base 011, and finally the lifting platform 003 is driven to descend so that the entire child safety seat 001 is located below the adult seat base 021, which does not affect the normal use of the adult seat 002; when the child safety seat 001 needs to be used, the lifting platform 003 is driven to rise so that the entire child safety seat 001 rises to the same horizontal plane as the adult seat base 021. At this time, the base guardrail 012, the backrest guardrail 014 and the pillow 015 are folded outward to a specified angle, thereby providing protection for the child's legs, torso and both sides of the head. A control unit 006 can be installed below the adult seat base 021 to facilitate the angle adjustment of the child seat, thereby realizing the integration of the adult seat and the child seat.

[0032] like Figure 2 and Figure 3As shown, the base guardrail 012 on both sides of the child safety seat 001 and the connection between the child seat base 011 are respectively provided with a steering gear steering mechanism, specifically including a first steering gear 41, a gear set 42 and a base guardrail hinge 43, wherein one end of the base guardrail hinge 43 is fixedly connected to the base guardrail 012, and the other end is fixedly connected to the child seat base 011, and the first steering gear 41 is connected to the control unit 006 and controlled by it; when the child seat needs to be used, that is, when the child seat is unfolded, the first steering gear 41 drives the base guardrail hinge 43 through the gear set 42 The first servo 41 drives the base guardrail hinge 43 to rotate via the gear set 42, so that the angle of the base guardrail hinge 43 becomes smaller, and the angle between the base guardrail 012 and the child seat base 011 also becomes smaller; the angle between the base guardrail 012 and the child seat base 011 can be adjusted by controlling the first servo 41 via the control unit 006.

[0033] like Figure 2 and Figure 4 As shown, the inner parts of the connection between the backrest guardrail 014 and the child seat backrest 013 on both sides of the child safety seat 001 are respectively provided with a steering gear steering mechanism, specifically including a second steering gear 412, the gear set 42 and a backrest guardrail hinge 432, the second steering gear 412 is connected to the control unit 006 and is controlled by it, wherein one side of the backrest guardrail hinge 432 is fixedly connected to the backrest guardrail 014, and the other side is fixedly connected to the child seat backrest 013; when the child seat needs to be used, that is, when the child seat is unfolded, the second steering gear 412 drives the backrest guardrail hinge 432 through the gear set 42 The second servo 412 drives the backrest guardrail hinge 432 to rotate via the gear set 42, so that the angle of the backrest guardrail hinge 432 becomes smaller, and the angle between the backrest guardrail 014 and the child seat back 013 also becomes smaller; the angle between the backrest guardrail 014 and the child seat back 013 can be adjusted by controlling the second servo 412 via the control unit 006.

[0034] like Figure 2 and Figure 5As shown, the third servo 413 and the gear set 42 are respectively provided inside the two sides of the child seat backrest 013 near the pillow 015, and are connected to the pillow 015 through an axis, and a pillow hinge 433 is provided in the pillow 015, wherein one side of the pillow hinge 433 is respectively fixedly connected to the two side parts of the pillow 015, and the other side is respectively fixedly connected to the main part of the pillow 015, and the third servo 413 is connected to the control unit 006 and controlled by it; when the child seat is needed to be used, that is, when the child seat is unfolded, the third servo 413 is The gear set 42 drives the pillow hinge 433 to rotate, so that the angle of the pillow hinge 433 becomes larger, and the angle between the two sides of the pillow 015 and the main body also becomes larger; when the child seat is not needed and needs to be folded, the third servo 413 drives the pillow hinge 433 to rotate through the gear set 42, so that the angle of the pillow hinge 433 becomes smaller, and the angle between the two sides of the pillow 015 and the main body also becomes smaller; the angle between the two sides of the pillow 015 and the main body can be adjusted by controlling the third servo 413 by the control unit 006.

[0035] like Figure 6 and Figure 7 As shown, the child seat base 011 and the child seat backrest 013 of the child safety seat 001 adopt a self-locking shaft 005 of a rear-row deformable seat of a car, and the self-locking shaft 005 includes a locking button 051, a central shaft 052, a first shaft sleeve 053 and a second shaft sleeve 054, the locking button 051 is fixed to one end of the central shaft 052, and the locking button 051 is also fixed to the side of the child safety seat 001; the second shaft sleeve 054 is provided with two, which are respectively located at On both sides of the central rotating shaft 052, the first rotating shaft sleeve 053 is located in the middle of the central rotating shaft 052, and the first rotating shaft sleeve 053 and the second rotating shaft sleeve 054 can rotate around the central rotating shaft 052; the central rotating shaft 052 is cooperated and connected with the backrest and the base of the child safety seat 001 inside the connection, and a spring 055 is provided on the side away from the locking button 051; the first rotating shaft sleeve 053 and the second rotating shaft sleeve 054 can be locked by the locking button 051 so that they will not rotate relative to each other.

[0036] A connecting plate 056 is fixedly installed on the first rotating shaft sleeve 053 and the second rotating shaft sleeve 054 to assist in fixing the child seat backrest 013 and the child seat base 011, wherein the connecting plates 056 on the two first rotating shaft sleeves 053 are fixed on the child seat base 011, and the connecting plates 056 on the second rotating shaft sleeve 054 are fixed on the backrest of the child seat backrest 013.

[0037] A first tooth-shaped groove 0531 and a second tooth-shaped groove 0541 are respectively provided on the inner surface of the connection between the first rotating shaft sleeve 053 and the second rotating shaft sleeve 054 near one end of the locking button 051, and a tooth-shaped protrusion 0521 is provided on the corresponding position of the central rotating shaft 052, wherein the length of the first tooth-shaped groove 0531 on the inner surface of the first rotating shaft sleeve 053 can completely fit the tooth-shaped protrusion 0521 on the central rotating shaft 052;

[0038] like Fig.15 As shown, the spring 055 pushes the central rotating shaft 052 in the direction of the locking button 051. When the locking button 051 is pressed, the entire central rotating shaft 052 moves in the direction of the spring 055. At this time, the toothed protrusions 0521 on the central rotating shaft 052 all slide into the first toothed grooves 0531 of the first rotating shaft sleeve 053. At this time, there is no restriction of the toothed protrusions 0521 between the first toothed grooves 0531 and the second toothed grooves 0541. The first rotating shaft sleeve 053 and the second rotating shaft sleeve 054 can rotate relative to each other. After adjusting to the desired angle, the locking button 051 is released. The entire central rotating shaft 052 moves in the direction of the locking button 051 under the action of the spring 055. Fig.14 As shown, at this time, the tooth-shaped protrusion 0521 on the central rotating shaft 052 is stuck between the first tooth-shaped groove 0531 and the second tooth-shaped groove 0541 of the first rotating shaft sleeve 053 and the second rotating shaft sleeve 054. At this time, the first rotating shaft sleeve 053 and the second rotating shaft sleeve 054 are stuck by the tooth-shaped protrusion 0521 and cannot rotate relative to each other, thereby achieving locking.

[0039] like Figure 8-Figure 10As shown, the lifting platform 003 includes a bottom frame 031, a top frame 032, a seat fixing plate 033, a first oblique bracket 034, a second oblique bracket 035, a lifting hydraulic rod 036 and a translation hydraulic rod 037. The bottom frame 031 and the top frame 032 are aligned with each other in the vertical direction. A bottom frame slide groove 311 and a bottom slide groove connecting rod 312 are provided inside one half of the bottom frame 031, and a top frame slide groove 321 and a top slide groove connecting rod 322 are provided inside the same half of the corresponding top frame 032; the first oblique bracket 034 and the second oblique bracket 035 are respectively provided with two, and the first oblique bracket 034 and the second oblique bracket 035 are respectively provided with two. One end of the second inclined bracket 035 is hingedly connected to one end of the top frame 032 away from the top frame slide 321, and the other end is hingedly connected to the bottom slide connecting rod 312. At the same time, the first inclined bracket 034 and the second inclined bracket 035 are hingedly connected in the middle. A fixed rod 038 is provided on the upper side of the two first inclined brackets 034. The lifting hydraulic rod 036 is fixed between the fixed rod 038 and the bottom slide connecting rod 312. The hydraulic rod 036 is connected to the control unit 006 and is controlled by it. The height difference between the bottom frame 031 and the top frame 032 can be adjusted by controlling the extension and retraction of the lifting hydraulic rod 036. The seat fixing plate 033 is located on the top frame 032 and is connected by a sliding fit. The translation hydraulic rod 037 is fixedly installed on the top frame 032 at one end away from the top frame slide groove 321 and is fixedly connected to the seat fixing plate 033. The position of the seat fixing plate 033 can be adjusted by controlling the extension and retraction of the translation hydraulic rod 037. When the child safety seat 001 needs to be used, the translation hydraulic rod 037 The seat fixing plate 033 is driven to be pushed toward the front of the seat, and at the same time, the lifting hydraulic rod 036 is driven to extend, so that the top frame 032 is raised, thereby driving the child safety seat 001 to be raised to a specified position, and then the child safety seat 001 is fully unfolded for use; when the child safety seat 001 is not in use, the lifting hydraulic rod 036 is driven to be shortened, so that the top frame 032 is lowered, thereby driving the child safety seat 001 to be lowered into the adult seat base 021, and the translation hydraulic rod 037 drives the seat fixing plate 033 to be pushed toward the rear of the seat, thereby making full use of the space of the adult seat base 021.

[0040] like Fig.11 and Fig.12As shown, a separation layer 211 is provided on the adult seat base 021 of the adult seat 002, which can cooperate with the seat base 021 to form the upper surface of the adult seat base 021. At the same time, the separation layer 211 is hinged to the adult seat base 021 near the adult seat back 022, so that the separation layer 211 can be opened. When the child safety seat 001 needs to be used, the separation layer 211 is opened and placed against the adult seat back 022 of the adult seat 002 to leave space for the child safety seat 001. When the child safety seat 001 is not needed, the separation layer 211 is snapped onto the adult seat base 021 to restore it to the adult seat 002. The bottom material of the separation layer 211 is hard, and the top is a cushion, which can meet the strength requirements of the seat and the comfort level of adults.

[0041] A small boss may be provided at the intersection of the separation layer 211 and the seat base 021 to assist in stabilizing the separation layer 211 after being buckled.

[0042] The control unit 006 can use a single-chip microcomputer to control the rotation angle and direction of the first servo 41, the second servo 412 and the third servo 413, and can also control the extension or shortening of the lifting hydraulic rod 036 and the translation hydraulic rod 037. The angles of the first servo 41, the second servo 412 and the third servo 413 are divided into a folding angle and an unfolding angle, wherein the folding angle is a fixed value and the unfolding angle can be adjusted. The lifting hydraulic rod 036 and the translation hydraulic rod 037 are divided into an unfolded length and a stowed length, and both are fixed values.

[0043] The seat is usually kept Fig.12 The state shown can be used normally by adults at this time;

[0044] When the child seat is needed, the separation layer 211 is first opened, and the control unit 006 presses the unfolding button, and the seat will be unfolded from the Fig.11 In the state shown, the entire child seat is lifted and pushed outward a short distance by the lifting platform 003, and at the same time, the first servo 41, the second servo 412 and the third servo 413 drive the base guardrail 012, the back guardrail 014 and the two sides of the pillow 15 to unfold. At this time, the locking button 051 of the self-locking shaft 005 is pressed to adjust the angle between the child seat base 011 and the child seat back 013 of the child safety seat 001. When an angle suitable for children is found, the locking button 051 can be released, and finally the state shown in FIG. Figure 1 The position shown in the figure can now transform the original adult seat into a child seat for children to use.

[0045] When the child seat is used and needs to be stored, the control unit 006 presses the storage button, and the first steering engine 41, the second steering engine 412 and the third steering engine 413 drive the base guardrail 012, the back guardrail 014 and the two sides of the pillow 15 to buckle as shown in the figure. Fig.13 In the state shown, the locking button 051 of the self-locking shaft 005 is pressed at the same time to buckle the child seat base 011 and the child seat backrest 013 of the child safety seat 001 into a state as shown. Fig.11 Finally, the lifting platform 003 lowers the entire child seat to below the adult seat base 021 and pushes it a short distance toward the backrest to prevent the child safety seat from leaking out, and finally the separation layer 211 is buckled into a Fig.12 As indicated, continue to be used by adults.

[0046] As a possible implementation, a plurality of buttons may be provided on the control unit 006 to respectively control the deployment angles of the first servo 41, the second servo 412 and the third servo 413, so that the base guardrail 012, the back guardrail 014 and the pillow 15 are deployed at different angles so as to be suitable for children of different body shapes.

[0047] As a possible implementation, the transmission ratio of the gear set connected to the first servo 41, the second servo 412 and the third servo 413 can be adjusted according to the servo torque and the locking force at the guardrail required in actual use, mainly to prevent the base guardrail 012, the backrest guardrail 014 and the two sides of the pillow 15 from rotating easily.

[0048] As a possible implementation, the child seat backrest 013 of the child safety seat 001 may be provided with a plurality of safety belt holes, and the fixed positions may be freely selected according to the size of the child using the child.

[0049] This embodiment integrates the child work seat into the rear seat of the car. The adult seat in the rear seat of the car can be transformed into a safety seat for children through simple operations, saving space and eliminating the need for cumbersome disassembly, so that users can use it conveniently. In addition, as the child grows older, the seat can adapt to children of different sizes by adjusting the angles of the headrest, base guardrail, and backrest guardrail, thereby increasing its applicability.

[0050] The self-locking rotating shaft proposed in this embodiment can adjust the backrest angle of the child safety seat through simple operation, and has a self-locking function after adjustment, ensuring that the backrest of the child safety seat will not deviate in angle after the angle is adjusted.

[0051] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A self-locking shaft for a rear-row deformable seat of a car, characterized in that: The child safety seat (001) comprises a locking button (051), a central rotating shaft (052), a first rotating shaft sleeve (053) and a second rotating shaft sleeve (054); the locking button (051) is fixed to one end of the central rotating shaft (052), and the locking button (051) is also fixed to the side of the child safety seat (001); two second rotating shaft sleeves (054) are provided, which are respectively located on both sides of the central rotating shaft (052); the first rotating shaft sleeve (053) is located in the middle of the central rotating shaft (052); The first rotating shaft sleeve (053) and the second rotating shaft sleeve (054) can rotate around the central rotating shaft (052); the central rotating shaft (052) is matched and connected with the backrest and the base of the child safety seat (001) inside the connection part, and a spring (055) is provided on the side away from the locking button (051); the first rotating shaft sleeve (053) and the second rotating shaft sleeve (054) can be locked by the locking button (051) so that they will not rotate relative to each other.

2. The self-locking shaft of a rear-row deformable seat of a car according to claim 1, characterized in that: A connecting plate (056) is fixedly mounted on both the first rotating shaft sleeve (053) and the second rotating shaft sleeve (054) to assist in fixing the child seat backrest (013) and the child seat base (011) of the child safety seat (001), wherein the connecting plates (056) on the two first rotating shaft sleeves (053) are fixed on the child seat base (011), and the connecting plates (056) on the second rotating shaft sleeve (054) are fixed on the backrest of the child seat backrest (013).

3. The self-locking shaft of the rear deformable seat of a car according to claim 1, characterized in that: A first tooth-shaped groove (0531) and a second tooth-shaped groove (0541) are respectively provided on the inner surface of the connection between the first rotating shaft sleeve (053) and the second rotating shaft sleeve (054) near one end of the locking button (051), and a tooth-shaped protrusion (0521) is provided on the corresponding position of the central rotating shaft (052), wherein the length of the first tooth-shaped groove (0531) on the inner surface of the first rotating shaft sleeve (053) can completely fit the tooth-shaped protrusion (0521) on the central rotating shaft (052).

4. The self-locking shaft of the rear deformable seat of a car according to claim 3, characterized in that: The spring (055) pushes the central rotating shaft (052) in the direction of the locking button (051). When the locking button (051) is pressed, the entire central rotating shaft (052) moves in the direction of the spring (055). At this time, the tooth-shaped protrusion (0521) on the central rotating shaft (052) slides completely into the first tooth-shaped groove (0531) of the first rotating shaft sleeve (053). At this time, there is no restriction of the tooth-shaped protrusion (0521) between the first tooth-shaped groove (0531) and the second tooth-shaped groove (0541). The first rotating shaft sleeve (053) and the second rotating shaft sleeve (0541) can be moved. After relative rotation occurs and the desired angle is adjusted, the locking button (051) is released, and the entire central shaft (052) moves toward the locking button (051) under the action of the spring (055). At this time, the toothed protrusion (0521) on the central shaft (052) is inserted into the first toothed groove (0531) and the second toothed groove (0541) of the first shaft sleeve (053) and the second shaft sleeve (054). At this time, the first shaft sleeve (053) and the second shaft sleeve (054) are stuck by the toothed protrusion (0521) and cannot rotate relative to each other, thereby achieving locking.

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