Automobile safety seat

Abstract

The invention discloses an automobile safety seat which comprises a backrest framework (1) and a seat cushion framework (2), the backrest framework (1) is rotatably connected with the seat cushion framework (2), a backrest angle adjusting device is arranged on the backrest framework (1), a headrest framework (3) is movably installed on the top of the backrest framework (1), a headrest height adjusting device is further arranged on the backrest framework (1), and the headrest height adjusting device is movably installed on the headrest framework (3). The backrest angle adjusting device and the headrest height adjusting device are both electrically connected with a seat controller, and the seat controller is connected with an ECU through a CAN bus. On the basis that the lying posture can be achieved, the safety problem of the lying posture in the driving process is considered at the same time, and the safety of passengers when accidents happen in the driving process is ensured.

Description

Technical Field

[0001] The invention relates to a car safety seat and belongs to the technical field of car seats. Background Art

[0002] In order to improve seat comfort, many models have launched seats with backrests that can be adjusted backwards at a large angle. After the seat is adjusted backwards at a large angle, the occupants can reach a nearly lying position, which can improve riding comfort.

[0003] The seats can be adjusted to a large angle posture, but when a traffic accident occurs with the seats in this posture, since the seat belts of conventional vehicles are installed on the body, the seat belts cannot be used in the lying position or do not fit the human body after being fastened. The seat belts cannot effectively restrain the occupants, resulting in significantly more injuries to the occupants than in a normal sitting position. Therefore, such seats are prohibited from being adjusted to a large angle posture during driving.

[0004] In the prior art, some models have seat belts installed on seats with large inclinations. The seat belts can be used in a reclining position, but there are no other safety measures in the event of an accident. The injuries suffered by passengers in this position are significantly greater than those in a normal sitting position. Therefore, it is not recommended to adjust such seats to a large inclination position during driving. The large inclination position is only recommended for use during parking. Summary of the invention

[0005] The purpose of the present invention is to provide a car safety seat to solve the technical problems in the prior art. On the basis of being able to realize a lying position, the invention also takes into account the safety issues of the lying position during driving, thereby ensuring the safety of passengers in the event of an accident during driving.

[0006] The present invention provides a car safety seat, comprising a backrest frame and a seat cushion frame, wherein the backrest frame is rotatably connected to the seat cushion frame, a backrest angle adjustment device is arranged on the backrest frame, a headrest frame is movably mounted on the top of the backrest frame, a headrest height adjustment device is also arranged on the backrest frame, the backrest angle adjustment device and the headrest height adjustment device are both electrically connected to a seat controller, and the seat controller is connected to an ECU via a CAN bus.

[0007] In the aforementioned car safety seat, preferably, a seat belt retractor is installed on the upper end of one side of the backrest frame, one end of the seat belt is connected to the seat belt retractor, and the other end of the seat belt is fixed to the seat cushion frame, and the fixing point of the seat belt and the seat cushion frame is located on the same side as the seat belt retractor.

[0008] In the aforementioned car safety seat, preferably, the lower end of the backrest frame has backrest side panels on both sides, the cushion frame has seat cushion side panels on both sides, and the two seat cushion side panels are each provided with a backrest connecting plate, and the two backrest side panels are respectively connected to the two backrest connecting plates via angle adjusters.

[0009] In the aforementioned car safety seat, preferably, the backrest angle adjustment device includes a first brushless motor, a second brushless motor and a synchronization rod, the first brushless motor and the second brushless motor are fixed on the left and right sides of the lower end of the backrest frame, the two ends of the synchronization rod are connected to the two angle adjusters, the first brushless motor and the second brushless motor are respectively connected to the synchronization rod through a gear assembly, and the first brushless motor and the second brushless motor are both electrically connected to the seat controller.

[0010] In the aforementioned car safety seat, preferably, a circular mounting hole and an arc-shaped mounting hole are opened at the lower portion of the backrest connecting plate, a step bolt is installed in the circular mounting hole, and the step bolt is threadedly connected to the seat cushion side panel after passing through the circular mounting hole, and a limiting screw is also installed on the seat cushion side panel, and the limiting screw passes through the arc-shaped mounting hole.

[0011] In the aforementioned car safety seat, preferably, an unlocking device is installed on one of the cushion side panels, and a locking pin hole is opened on the cushion side panel, and the pin on the unlocking device passes through the arc-shaped installation hole and is plugged into the locking pin hole.

[0012] In the aforementioned car safety seat, preferably, the unlocking device includes a cylindrical shell, a mounting plate, the latch and a piston, the mounting plate is fixedly provided on the outer wall of one end of the cylindrical shell, the mounting plate is fixed to the cushion side plate by bolts, one end of the latch is plug-connected to the cylindrical shell, the piston is installed in the cylindrical shell, and the piston is fixed to the end of the latch by a locking nut, the cylindrical shell is filled with gunpowder, a gunpowder ignition assembly is provided in the cylindrical shell, and the gunpowder ignition assembly is electrically connected to the ECU.

[0013] In the aforementioned car safety seat, preferably, the headrest height adjustment device includes a headrest adjustment motor, a screw rod and a connecting piece, a motor mounting bracket is fixedly provided on the top of the backrest frame, the headrest adjustment motor is fixed on the motor mounting bracket, the upper end of the screw rod is fixedly connected to the output shaft of the headrest adjustment motor, the screw rod is connected to the headrest frame through the connecting piece, and the headrest adjustment motor is electrically connected to the seat controller.

[0014] In the aforementioned car safety seat, preferably, the motor mounting bracket includes a first guide rod, a second guide rod and a support plate, the lower ends of the first guide rod and the second guide rod are fixedly connected to the top of the backrest frame, the first guide rod is parallel to the second guide rod, the support plate is mounted on the first guide rod and the second guide rod, the headrest adjustment motor is fixedly connected to the upper ends of the first guide rod and the second guide rod, a screw rod avoidance hole is opened on the support plate, and the screw rod passes through the screw rod avoidance hole.

[0015] In the aforementioned car safety seat, preferably, the connecting member includes a headrest frame connecting seat and a screw connecting block, the headrest frame connecting seat is fixed to the back of the headrest frame by a bolt assembly, the screw connecting block is fixed to the frame connecting seat by bolts, and the screw connecting block is threadedly connected to the screw, and two baffles are formed on the headrest frame connecting seat, and the two baffles are respectively in contact with the first guide rod and the second guide rod.

[0016] Compared with the prior art, the present invention includes a backrest frame and a seat cushion frame, the backrest frame is rotatably connected with the seat cushion frame, a backrest angle adjustment device is arranged on the backrest frame, a headrest frame is movably installed on the top of the backrest frame, a headrest height adjustment device is also arranged on the backrest frame, the backrest angle adjustment device and the headrest height adjustment device are both electrically connected to the seat controller, and the seat controller is connected to the ECU through a CAN bus. The present invention sets a backrest angle adjustment device, when the vehicle collides, the ECU sends a command to the seat controller, and the seat controller controls the backrest angle adjustment device to adjust the angle, so that the seat backrest is quickly switched from a lying state to a sitting state, so that the accident injury suffered by the occupant is significantly reduced, which not only meets the needs of the occupant to use the lying state during the vehicle driving, but also ensures the safety of the occupant. In addition, in the lying state of the present invention, the ECU can send a command to the seat controller, and the seat controller controls the headrest height adjustment device to adjust the headrest to a suitable position, so that the occupant's head can be effectively supported. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an axonometric diagram of the overall structure of the present invention;

[0018] Figure 2 It is an enlarged view of the installation position of the first brushless motor;

[0019] Figure 3 It is a connection structure diagram of the backrest side panels, the seat cushion side panels and the backrest connecting plate;

[0020] Figure 4 It is an exploded view of the unlocking device and the connecting plate of the seat cushion side panel and backrest;

[0021] Figure 5It is an exploded view of the unlocking device;

[0022] Figure 6 is a schematic diagram of the structure of a headrest height adjustment device;

[0023] Figure 7 This is an exploded view of the headrest height adjustment device.

[0024] Explanation of the accompanying drawings: backrest frame 1, seat cushion frame 2, headrest frame 3, safety belt retractor 4, safety belt 5, backrest side panel 6, seat cushion side panel 7, backrest connecting plate 8, adjuster 9, first brushless motor 10, second brushless motor 11, synchronization rod 12, circular mounting hole 13, arc-shaped mounting hole 14, limit screw 15, step bolt 16, unlocking device 17, lock pin hole 18, latch 19, columnar shell 20, mounting plate 21, piston 22, locking nut 23, locking tongue 24, seat belt buckle 25, elastic washer 26, sealing ring 27, headrest adjustment motor 29, screw 30, first guide rod 31, second guide rod 32, support plate 33, screw avoidance hole 34, headrest frame connecting seat 35, screw connecting block 36, baffle 37. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0026] Embodiment 1 of the present invention: Figure 1-Figure 7 As shown, a car safety seat includes a backrest frame 1 and a seat cushion frame 2, the backrest frame 1 is rotatably connected to the seat cushion frame 2, a backrest angle adjustment device is provided on the backrest frame 1, a headrest frame 3 is movably installed on the top of the backrest frame 1, and a headrest height adjustment device is also provided on the backrest frame 1, the backrest angle adjustment device and the headrest height adjustment device are both electrically connected to the seat controller, and the seat controller is connected to the ECU through a CAN bus.

[0027] When the vehicle collides, the ECU receives the collision signal and sends a command to the seat controller, which controls the backrest angle adjustment device to work. If the backrest angle adjustment device detects that the backrest frame 1 is in a lying position, the backrest frame 1 will quickly return to its original position by 20° within 0.7 seconds, so that the occupant can be adjusted from a lying position to a sitting position. In the sitting position, the injury value of the occupant's neck, abdomen and lumbar spine can be significantly reduced.

[0028] In addition, by providing a headrest height adjustment device, the seat controller will automatically adjust the position of the headrest frame 3 according to the angle of the backrest frame 1, so that the headrest can always support the occupant's head, which not only improves riding comfort but also improves safety.

[0029] It should be noted that the ECU and the seat controller are both existing technologies, which are not shown in the figure, and their specific structures and working principles are not repeated in this embodiment.

[0030] In a specific embodiment, a seat belt retractor 4 is installed on the upper end of one side of the backrest frame 1, one end of the seat belt 5 is connected to the seat belt retractor 4, and the other end of the seat belt 5 is fixed on the seat cushion frame 2, and the fixing point of the seat belt 5 and the seat cushion frame 2 is located on the same side as the seat belt retractor 4.

[0031] by Figure 1 For example, Figure 1 The seat is arranged on the right side of the vehicle, the seat belt retractor 4 is arranged on the right side of the backrest frame 1, the seat belt fixing point is located on the right side of the seat cushion frame 2, the seat belt buckle 25 is fixed on the left side of the seat cushion frame 2, and the lock tongue 24 is movably installed on the seat belt 5. Figure 1 The structure is symmetrical, and the seat belt retractor 4 and the seat belt fixing point are both located on the left side.

[0032] Through the above structural design, the occupant can be protected by the safety belt 5 whether in a sitting state or a lying state, thereby improving the safety in the lying state.

[0033] Furthermore, the backrest frame 1 has backrest side panels 6 on both sides of the lower end, the seat cushion frame 2 has seat cushion side panels 7 on both sides, and the two seat cushion side panels 7 are each provided with a backrest connecting plate 8, and the two backrest side panels 6 are respectively connected to the two backrest connecting plates 8 through angle adjusters 9.

[0034] One side of the recliner 9 is welded and fixed to the backrest side panel 6, and the other side of the recliner 9 is welded and fixed to the backrest connecting plate 8. The recliner 9 is a prior art and can be purchased directly. The angle between the seat cushion side panel 7 and the backrest connecting plate 8 can be changed by the recliner 9 to adjust the backrest angle.

[0035] The backrest angle adjustment device includes a first brushless motor 10, a second brushless motor 11 and a synchronization rod 12. The first brushless motor 10 and the second brushless motor 11 are fixed on the left and right sides of the lower end of the backrest frame 1. The two ends of the synchronization rod 12 are connected to two angle adjusters 9. The first brushless motor 10 and the second brushless motor 11 are connected to the synchronization rod 12 through gear assemblies respectively. The first brushless motor 10 and the second brushless motor 11 are both electrically connected to the seat controller.

[0036] The first brushless motor 10 and the second brushless motor 11 are both high-power high-speed brushless motors, which can be purchased, and their power and speed can be selected according to needs. The gear assembly can be a commonly used reversing gear assembly. When the first brushless motor 10 and the second brushless motor 11 are working, the gear assembly drives the synchronization rod 12 to rotate, and the rotation of the synchronization rod 12 drives the two angle adjusters 9 to work, and the two angle adjusters 9 adjust the inclination angle of the backrest frame 1. Because when the vehicle collides, it is necessary to quickly return to 20° within 0.7 seconds, so it is necessary to use two brushless motors to simultaneously drive the synchronization rod 12 to rotate.

[0037] Furthermore, the headrest height adjustment device includes a headrest adjustment motor 29, a screw rod 30 and a connecting piece. A motor mounting bracket is fixedly provided on the top of the backrest frame 1, the headrest adjustment motor 29 is fixed on the motor mounting bracket, the upper end of the screw rod 30 is fixedly connected to the output shaft of the headrest adjustment motor 29, the screw rod 30 is connected to the headrest frame 3 through the connecting piece, and the headrest adjustment motor 29 is electrically connected to the seat controller.

[0038] The seat controller controls the forward and reverse rotation of the headrest adjustment motor 29. When the headrest adjustment motor 29 is working, it drives the connecting piece to move up and down through the screw rod 30, and then drives the headrest frame 3 to move through the connecting piece to achieve the adjustment of the headrest height.

[0039] The motor mounting bracket includes a first guide rod 31, a second guide rod 32 and a support plate 33. The lower ends of the first guide rod 31 and the second guide rod 32 are fixedly connected to the top of the backrest frame 1. The first guide rod 31 is parallel to the second guide rod 32. The support plate 33 is installed on the first guide rod 31 and the second guide rod 32. The headrest adjustment motor 29 is fixedly connected to the upper ends of the first guide rod 31 and the second guide rod 32. A screw avoidance hole 34 is opened on the support plate 33, and the screw rod 30 passes through the screw avoidance hole 34.

[0040] Specifically, the first guide rod 31 and the second guide rod 32 are arranged perpendicular to the top surface of the backrest frame 1, and a limiting boss is formed near the top of the first guide rod 31 and the second guide rod 32, and the limiting boss is used to limit the position of the mounting plate 33. Two guide rod mounting holes are provided on the mounting plate 33, and the mounting plate 33 is connected to the first guide rod 31 and the second guide rod 32 through the two guide rod mounting holes. The function of the mounting plate 33 is to support the headrest adjustment motor 29. The upper ends of the first guide rod 31 and the second guide rod 32 are processed with threads, and the first guide rod 31 and the second guide rod 32 are fixed with bolts after passing through the mounting holes on the headrest adjustment motor 29.

[0041] Furthermore, the connecting part includes a headrest frame connecting seat 35 and a screw connecting block 36. The headrest frame connecting seat 35 is fixed to the back of the headrest frame 3 by a bolt assembly. The screw connecting block 36 is fixed to the frame connecting seat 35 by bolts, and the screw connecting block 36 is threadedly connected to the screw 30. Two baffles 37 are formed on the headrest frame connecting seat 35, and the two baffles 37 are in contact with the first guide rod 31 and the second guide rod 32 respectively.

[0042] When the angle of the backrest frame 1 changes, the seat controller will calculate the required adjustment amount of the headrest frame 3 according to its built-in control algorithm, and then the seat controller will control the headrest adjustment motor 29 to work. When the headrest adjustment motor 29 works, it drives the screw rod connection block 36 to move up or down through the screw rod 30. Through the setting of two baffles 37, when the screw rod 30 cooperates with the screw rod connection block 36, since the two baffles 37 are in contact with the first guide rod 31 and the second guide rod 32, the frame connection seat 35 and the screw rod connection block 36 will only move along the axis direction of the first guide rod 31 and the second guide rod 32 without circumferential rotation, thereby ensuring the stability of the movement of the headrest frame 3. When the backrest frame 1 changes from the sitting mode to the lying mode, as the inclination angle of the backrest frame 1 increases, the headrest frame 3 gradually moves towards the direction close to the seat cushion, so that the occupant's head can always be supported by the headrest. On the contrary, when the backrest frame 1 changes from the lying mode to the sitting mode, the headrest frame 3 gradually moves away from the seat cushion.

[0043] Embodiment 2 of the present invention: Figure 1-Figure 7 As shown, on the basis of Example 1, a circular mounting hole 13 and an arc-shaped mounting hole 14 are opened at the lower portion of the backrest connecting plate 8, a step bolt 16 is installed in the circular mounting hole 13, and the step bolt 16 passes through the circular mounting hole 13 and is threadedly connected to the seat cushion side panel 7, and a limiting screw 15 is also installed on the seat cushion side panel 7, and the limiting screw 15 passes through the arc-shaped mounting hole 14.

[0044] An unlocking device 17 is installed on one of the cushion side panels 7 , and a lock pin hole 18 is opened on the cushion side panel 7 . A latch pin 19 on the unlocking device 17 passes through the arc-shaped mounting hole 14 and is plugged into the lock pin hole 18 .

[0045] Specifically, one end of the lower part of the backrest connecting plate 8 cooperates with the step bolt 16 through the circular mounting hole 13, so that the backrest connecting plate 8 can rotate on the step bolt 16, but will not move along the axial direction of the step bolt 16. Under normal circumstances, the limit screw 15 abuts against the upper end of the arc-shaped mounting hole 14, and the pin 19 on the unlocking device 17 abuts against the lower end of the arc-shaped mounting hole 14. At this time, the backrest connecting plate 8 is in a locked state, and the backrest connecting plate 8 cannot rotate around the step bolt 16. If the seat controller fails to control the operation of the backrest angle adjustment device when a collision occurs, the ECU controls the unlocking device 17 to operate, the pin 19 of the unlocking device 17 is retracted, and the pin 19 withdraws from the lock pin hole 18 and the arc-shaped mounting hole 14. When the vehicle collides, the human body leans forward due to inertia, and under the action of the seat belt 5, the human body drives the seat back to rotate toward the front of the vehicle. At this time, since the lower end of the arc-shaped mounting hole 14 loses its restriction, the backrest connecting plate 8 can rotate around the step bolt 16 until the limit screw 15 abuts against the lower end of the arc-shaped mounting hole 14.

[0046] This structural design can provide doubly secure protection that the seat back can be flipped from a lying position to a sitting position when a collision occurs.

[0047] In order to ensure that the seat back does not fall backward when flipped to a sitting position, an elastic washer 26 is sleeved on the limit screw 15. The elastic washer 26 is located between the seat cushion side plate 7 and the backrest connecting plate 8. Under the action of the elastic washer 26, the backrest frame 1 can stay at the current angle.

[0048] Furthermore, the unlocking device 17 includes a cylindrical shell 20, a mounting plate 21, a latch 19 and a piston 22. The mounting plate 21 is fixedly provided on the outer wall of one end of the cylindrical shell 20, and the mounting plate 21 is fixed to the seat cushion side plate 7 by bolts. One end of the latch 19 is plug-connected to the cylindrical shell 20, and the piston 22 is installed in the cylindrical shell 20, and the piston 22 is fixed to the end of the latch 19 by a locking nut 23. The cylindrical shell 20 is filled with gunpowder, and a gunpowder ignition assembly is arranged in the cylindrical shell 20, and the gunpowder ignition assembly is electrically connected to the ECU.

[0049] In this embodiment, three connecting tubes are arranged on the mounting plate 21, three threaded holes are provided on the cushion side plate 7, and a bolt is respectively installed on the three connecting tubes on the mounting plate 21, and the bolt is threadedly connected with the three threaded holes on the cushion side plate 7. After the mounting plate 21 is fixed, the columnar housing 20 is coaxial with the lock pin hole 18. An annular groove is provided on the circumferential wall of the piston 22, and a sealing ring 27 is installed in the annular groove. The gunpowder ignition assembly adopts the existing technology, and the gunpowder ignition assembly of the airbag can be used. After the ECU sends a signal to the gunpowder ignition assembly, the gunpowder ignition assembly ignites the gunpowder in the columnar housing 20, and the gas generated by the gunpowder explosion pushes the piston 22, and the piston 22 moves in a direction away from the backrest connecting plate 8. At the same time, the piston 22 drives the bolt 19 to move, and the end of the bolt 19 is separated from the lock pin hole 18 and the arc-shaped mounting hole 14, so as to unlock the backrest connecting plate 8.

[0050] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made according to the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.

Claims

1. A car safety seat, comprising a backrest frame (1) and a seat cushion frame (2), characterized in that: The backrest frame (1) is rotatably connected to the seat cushion frame (2); a backrest angle adjustment device is provided on the backrest frame (1); a headrest frame (3) is movably mounted on the top of the backrest frame (1); a headrest height adjustment device is also provided on the backrest frame (1); the backrest angle adjustment device and the headrest height adjustment device are both electrically connected to a seat controller; and the seat controller is connected to the ECU via a CAN bus.

2. The car safety seat according to claim 1, characterized in that: A seat belt retractor (4) is installed at an upper end of one side of the backrest frame (1); one end of a seat belt (5) is connected to the seat belt retractor (4); the other end of the seat belt (5) is fixed to the seat cushion frame (2); and the fixing point of the seat belt (5) and the seat cushion frame (2) is located on the same side as the seat belt retractor (4).

3. The car safety seat according to claim 1, characterized in that: The backrest frame (1) has backrest side panels (6) on both sides of the lower end, the seat cushion frame (2) has seat cushion side panels (7) on both sides, and the two seat cushion side panels (7) are each provided with a backrest connecting plate (8), and the two backrest side panels (6) are respectively connected to the two backrest connecting plates (8) via angle adjusters (9).

4. The car safety seat according to claim 3, characterized in that: The backrest angle adjustment device comprises a first brushless motor (10), a second brushless motor (11) and a synchronization rod (12); the first brushless motor (10) and the second brushless motor (11) are fixedly arranged on the left and right sides of the lower end of the backrest frame (1); the two ends of the synchronization rod (12) are connected to the two angle adjusters (9); the first brushless motor (10) and the second brushless motor (11) are respectively connected to the synchronization rod (12) via a gear assembly; and the first brushless motor (10) and the second brushless motor (11) are both electrically connected to the seat controller.

5. The car safety seat according to claim 4, characterized in that: A circular mounting hole (13) and an arc-shaped mounting hole (14) are provided at the lower portion of the backrest connecting plate (8); a step bolt (16) is installed in the circular mounting hole (13); the step bolt (16) passes through the circular mounting hole (13) and is threadedly connected to the seat cushion side plate (7); a limit screw (15) is also installed on the seat cushion side plate (7); the limit screw (15) passes through the arc-shaped mounting hole (14).

6. The car safety seat according to claim 5, characterized in that: An unlocking device (17) is installed on one of the cushion side panels (7), and a lock pin hole (18) is provided on the cushion side panel (7). The latch pin (19) on the unlocking device (17) passes through the arc-shaped mounting hole (14) and is plugged into the lock pin hole (18).

7. The car safety seat according to claim 6, characterized in that: The unlocking device (17) comprises a columnar housing (20), a mounting plate (21), the latch (19) and a piston (22); the mounting plate (21) is fixedly provided on the outer wall of one end of the columnar housing (20); the mounting plate (21) is fixed to the seat cushion side plate (7) by bolts; one end of the latch (19) is plug-connected to the columnar housing (20); the piston (22) is installed in the columnar housing (20), and the piston (22) is fixed to the end of the latch (19) by a locking nut (23); the columnar housing (20) is filled with gunpowder; a gunpowder ignition assembly is provided in the columnar housing (20); the gunpowder ignition assembly is electrically connected to the ECU.

8. The car safety seat according to claim 1, characterized in that: The headrest height adjustment device comprises a headrest adjustment motor (29), a screw rod (30) and a connecting piece; a motor mounting bracket is fixedly provided on the top of the backrest frame (1); the headrest adjustment motor (29) is fixed on the motor mounting bracket; the upper end of the screw rod (30) is fixedly connected to the output shaft of the headrest adjustment motor (29); the screw rod (30) is connected to the headrest frame (3) via the connecting piece; and the headrest adjustment motor (29) is electrically connected to the seat controller.

9. The car safety seat according to claim 8, characterized in that: The motor mounting bracket comprises a first guide rod (31), a second guide rod (32) and a support plate (33); the lower ends of the first guide rod (31) and the second guide rod (32) are fixedly connected to the top of the backrest frame (1); the first guide rod (31) is parallel to the second guide rod (32); the support plate (33) is mounted on the first guide rod (31) and the second guide rod (32); the headrest adjustment motor (29) is fixedly connected to the upper ends of the first guide rod (31) and the second guide rod (32); a screw rod avoidance hole (34) is provided on the support plate (33); the screw rod (30) passes through the screw rod avoidance hole (34).

10. The car safety seat according to claim 9, characterized in that: The connecting member comprises a headrest frame connecting seat (35) and a screw rod connecting block (36); the headrest frame connecting seat (35) is fixed to the back of the headrest frame (3) by a bolt assembly; the screw rod connecting block (36) is fixed to the frame connecting seat (35) by bolts, and the screw rod connecting block (36) is threadedly connected to the screw rod (30); two baffles (37) are formed on the headrest frame connecting seat (35); the two baffles (37) are in contact with the first guide rod (31) and the second guide rod (32) respectively.

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