Vehicle seat and vehicle

Abstract

The invention relates to a vehicle seat and a vehicle. The vehicle seat includes: a backrest portion; a headrest part provided on the backrest part so as to be capable of moving up and down; and an actuating portion provided in the backrest portion, in response to an instruction that a vehicle roof deformation amount of the vehicle is equal to or greater than a predetermined threshold value, automatically raising the headrest portion so as to come into contact with and support the vehicle roof, and maintaining the headrest portion in a supported state. The headrest part comprises a pair of supporting rods and a headrest body arranged at the top ends of the pair of supporting rods. A rotation driving part capable of driving the headrest body to rotate relative to the supporting rod is arranged in the headrest body, and the rotation driving part responds to the instruction and drives the headrest body to rotate relative to the supporting rod; the front surface of the headrest body used for contacting with the head of a passenger or the back surface opposite to the front surface becomes a contact surface contacting with the vehicle roof. The safety space of the head of a passenger in the vehicle can be guaranteed when the vehicle is subjected to top impact, and the passenger in the vehicle is protected.

Description

Technical Field

[0001] The present disclosure relates to a vehicle seat and a vehicle using the vehicle seat. Background Art

[0002] Under the existing technology, vehicle safety design mainly focuses on the protection of frontal collision and side collision. By strengthening the body structure, optimizing the airbag layout and adopting advanced collision warning systems, the occupant protection capabilities in these common collision scenarios have been significantly improved. However, the type of accident such as vehicle roof collision or vehicle roof being squeezed is often overlooked in existing vehicle safety considerations. In real life, there are many situations where the vehicle roof is impacted by external forces, such as: a large vehicle that has overturned presses down on a small vehicle parked next to it; when a vehicle rolls over in an accident, it will exert continuous pressure on the roof; and rolling rocks when driving on mountain roads or falling hail in hail weather will cause varying degrees of impact on the vehicle roof, so that the vehicle roof may suffer severe impact, posing a potential threat to the safety of the occupants in the vehicle.

[0003] There is a relative lack of safety protection measures against vehicle roof collisions in the current market, and technological innovation is urgently needed to comprehensively enhance the level of occupant protection in vehicles under various collision situations. Summary of the invention

[0004] In order to solve the above-mentioned technical problems of traditional vehicles, the present disclosure proposes a vehicle seat and a vehicle using the vehicle seat, which can ensure the head safety space of the occupants in the vehicle when the vehicle suffers a top impact, thereby protecting the occupants in the vehicle and improving safety performance.

[0005] Specifically, a first aspect of the present disclosure provides a vehicle seat, comprising:

[0006] Backrest;

[0007] a headrest portion, the headrest portion being provided on the backrest portion in a manner capable of moving up and down; and

[0008] an actuating portion, the actuating portion being disposed in the backrest portion, the actuating portion causing the headrest portion to automatically rise so as to contact with and support the vehicle roof in response to an instruction that a deformation amount of a vehicle roof of the vehicle is greater than a predetermined threshold value, and the actuating portion maintaining the headrest portion in a supported state,

[0009] The headrest portion includes a pair of support rods and a headrest body disposed at the top ends of the pair of support rods. By inserting the support rods into the backrest portion, the headrest portion is mounted to the backrest portion so that the headrest body is located above the backrest portion.

[0010] Among them, a rotation drive unit capable of driving the headrest body to rotate relative to the support rod is provided in the headrest body, and when the rotation drive unit responds to the instruction, it drives the headrest body to rotate relative to the support rod, so that the front side of the headrest body for contacting the occupant's head or the back side opposite to the front side becomes the contact surface with the vehicle ceiling.

[0011] According to the vehicle seat with the above-mentioned structure, the protection capability of the vehicle's top collision can be greatly improved. When the vehicle's top is deformed to a certain extent by collision, the headrest of the vehicle seat can respond quickly and automatically rise, and at the same time, it can rotate to contact the vehicle roof with a large contact area, thereby providing additional support force. Through the support of the headrest, the stability of the roof structure is enhanced to a certain extent, and the roof is prevented from excessive deformation or collapse during a collision, ensuring a safe space for the heads of the occupants in the vehicle, helping to reduce the impact of roof deformation on the occupants in the vehicle, reducing the risk of injury to the occupants, and can also help provide the occupants with more escape time and opportunities, reducing the risk of casualties caused by accidents, greatly improving the timeliness and effectiveness of accident response, and ensuring safety.

[0012] In addition, according to the above-mentioned scheme of the present invention, the structure for coping with the top collision of the vehicle is integrated into the vehicle seat itself, and does not require additional configuration and assembly of complex external components or additional structures, and will not occupy the space inside the vehicle. Moreover, the present invention uses the headrest part with a relatively short distance between the headrest and the vehicle roof as a supporting part, so as to achieve a rapid response to the top collision of the vehicle and support the vehicle roof at the fastest speed. Compared with the support structure set in other parts, the response is faster, which further improves the safety performance of the vehicle and the survival chance of the occupants.

[0013] Preferably, in the vehicle seat described in the first aspect, the actuating portion includes: a pair of cylinder portions, the pair of cylinder portions are arranged on the outer sides in the seat width direction in a one-to-one relationship relative to the pair of support rods, each of the cylinder portions includes a cylinder and a piston arranged inside the cylinder; a biasing portion, the biasing portion is connected to the end of the support rod, is arranged between the pair of cylinder portions below the end of the support rod and is connected to each of the pistons so as to be able to move in conjunction with the pistons; a switch portion, the switch portion is arranged in the cylinder portion and can be switched between a locking position for restricting movement of the piston and a release position for releasing the locking, wherein in the switch portion When the closing portion is in the locked position, the cylinder has an upper space above the upper end of the piston and a lower space below the lower end of the piston, and the biasing portion is in a state of being biased downward, and wherein the switch portion automatically switches from the locked position to the released position in response to the instruction; and a liquid storage portion, which is arranged between the pair of cylinder bodies below the biasing portion and stores hydraulic oil therein, and the liquid storage portion is connected to the corresponding cylinder body portion via one-way valves on both sides, and through the one-way valve, hydraulic oil is allowed to flow from the liquid storage portion into the lower space of the cylinder and hydraulic oil is prohibited from flowing from the lower space into the liquid storage portion.

[0014] According to the vehicle seat with the above structure, since it adopts the structure of the actuator as above, rapid response and high efficiency, stability and safety, compactness and reliability are fully realized. When the vehicle is hit by the top and the deformation is detected to be above the predetermined threshold, the actuator can respond quickly, and the locking state of the piston is released through the automatic switching of the switch part, so that the potential energy of the biasing part is quickly converted into the kinetic energy of the piston and the support rod (and then drives the seat headrest), so that the headrest can bounce up quickly. In addition, the hydraulic oil flowing from the liquid storage part into the lower space of the cylinder through the one-way valve increases the hydraulic assistance of the system, further improving the efficiency and strength of the headrest to bounce up, ensuring that the headrest can quickly and stably support the vehicle ceiling, providing effective head protection for passengers, and after the headrest bounces up and supports the ceiling, due to the incompressibility of the hydraulic oil and the limitation of the one-way valve, the pressure in the cylinder can be maintained, thereby ensuring the stability and fixity of the headrest, preventing shaking or falling back during the collision, and even if the vehicle continues to be impacted or vibrated, the headrest can maintain its position, providing continuous head support and protection for passengers. In addition, the relative layout of the cylinder body and the support rod in the drive unit and the setting position of the liquid storage unit help to make the entire drive structure more compact, optimize the space utilization inside the seat, avoid encroaching on the passenger riding space, and make the entire system more integrated and efficient.

[0015] Preferably, in the vehicle seat of the first aspect, the cylinder body portion further comprises: a sealing ring arranged at the upper end of the piston in the cylinder barrel; and one or more sealing rings arranged at the lower end of the piston in the cylinder barrel.

[0016] According to the vehicle seat with the above structure, the sealing ring of the upper end of the piston can prevent air, water or other impurities from entering the lower side of the cylinder body through the gap between the upper end of the piston and the cylinder body, and can also play a certain degree of guiding and supporting role, helping the piston to maintain a stable and correct movement trajectory in the cylinder barrel, especially when the upper end of the piston and the slide rod described later are integrally formed by metal, the guiding and supporting role of the elastic sealing ring is more obvious. By using more than one sealing ring located at the lower end of the piston in the cylinder barrel, the hydraulic oil in the cylinder barrel is effectively prevented from leaking upward from the gap between the piston and the cylinder barrel, ensuring that when the piston moves upward, the space below the cylinder barrel can maintain its hydraulic pressure, thereby enhancing the stability and efficiency of the system. Moreover, since the number of sealing rings is more than one, when the performance of a single sealing ring decreases due to wear or aging, the other sealing rings can still provide effective sealing to ensure the normal operation of the cylinder body. In addition, since the lower end adopts a sealing ring, the friction and wear between the lower end of the piston and the cylinder body can be better controlled, and the stability of the hydraulic cylinder during operation can be enhanced. At the same time, like the sealing ring of the upper end, it also plays a guiding and supporting role.

[0017] Preferably, in the vehicle seat described in the first aspect, the biasing portion includes: a sliding rod, which is connected to the end of the support rod of the headrest portion, and the two ends of the sliding rod in the length direction are connected to the corresponding upper end of the piston of the piston; an elastic portion, which is connected to the sliding rod below the sliding rod and can be extended and retracted in the up and down directions; and a support seat, which is fixedly connected below the elastic portion, and the two ends of the support seat in the length direction are fixed to the cylinder barrel of each cylinder body portion, thereby supporting the elastic portion from below.

[0018] According to the vehicle seat with the above-mentioned structure, the biasing part is composed of a sliding rod, an elastic part and a support seat. The sliding rod can be used to directly drive the headrest part to rise and fall while moving synchronously with the piston to start the one-way valve when the elastic part is in motion. One thing can be used for multiple purposes, thereby reducing parts, reducing costs, and occupying low space, and it has excellent synchronization and stability. The elastic part is used to provide the lifting force required to drive the headrest part to rise and fall, and it can also provide a buffering effect when the headrest part is subjected to external force. The support seat is used, and its two ends in the length direction are fixed to the cylinder barrels of each cylinder body part, thereby ensuring the stability and reliability of the biasing part and preventing shaking or deviation during movement. The support seat supports the elastic part from below, provides a stable support point for the expansion and contraction of the elastic part, and helps to maintain the shape and performance of the elastic part.

[0019] Preferably, in the vehicle seat of the first aspect, the biasing portion further comprises: a support seat support rod, one end of the support seat support rod is fixedly connected to the support seat, and the other end is fixedly connected to the frame of the backrest portion to support the support seat to the frame of the backrest portion.

[0020] According to the vehicle seat with the above structure, the support seat is not only supported and fixed by means of the two ends being fixed to the cylinder body, but can also be further fixed to the backrest portion by means of the support seat support rod, thereby further improving the reliability of fixing the support seat and also improving the reliability of the entire system.

[0021] Preferably, in the vehicle seat described in the first aspect, the switch portion is an electromagnetic latch provided on each of the cylinder body portions, and in the locked position, the electromagnetic latch extends into the cylinder barrel of the cylinder body portion so as to lock the upper end of the piston from the upper side of the upper end of the piston; and in response to the instruction, the electromagnetic latch retracts from the extended state to the release position for releasing the lock.

[0022] According to the vehicle seat with the above-mentioned structure, the switch part is constructed by an electromagnetic latch pin, which achieves a fast response with a simple structure and can complete the locking and releasing actions in a very short time, so that the system can respond to instructions more quickly, reduce performance degradation or safety issues caused by delays, and is easy to integrate and accurately control with other devices or systems.

[0023] Preferably, in the vehicle seat described in the first aspect, the one-way valve includes: a valve body shell, a spring and a ball; the diameter of the cylinder body end of the valve body shell located on the cylinder body side is larger than the diameter of the liquid storage end located on the liquid storage side; the diameter of the ball is between the diameter of the cylinder body end and the diameter of the liquid storage end, that is: the diameter of the cylinder body end>the diameter of the ball>the diameter of the liquid storage end; and the spring is arranged at the cylinder body end relative to the ball.

[0024] According to the vehicle seat having the above-mentioned structure, the one-way valve is composed of only three main components, namely, a valve body shell, a spring and a ball, and has a simple structure, a small number of components, a fast response speed, and excellent sealing effect and durability.

[0025] Preferably, in the vehicle seat described in the first aspect, a reflux passage is further provided between the liquid storage portion and the cylinder portion, and a valve is provided in the reflux passage, and by opening the valve, the hydraulic oil entering the cylinder body can flow back into the liquid storage portion.

[0026] According to the vehicle seat having the above-mentioned structure, the hydraulic oil can flow back to the liquid storage part through the reflux passage, thereby realizing the recycling of the hydraulic oil, reducing the demand for new hydraulic oil, lowering operating costs, and also reducing the burden on the environment caused by hydraulic oil discharge, thereby achieving energy conservation and environmental protection.

[0027] Preferably, in the vehicle seat described in the first aspect, the rotation drive unit includes: a motor; and a rotating shaft, which is integral with the frame of the headrest body, extends inward from the frame of the headrest body along the seat width direction, and is integrally connected with the output shaft of the motor, so that the rotating shaft rotates under the drive of the motor to drive the frame of the headrest body to rotate; and a motor fixing rod, which is integral with the frame of the headrest body, extends in a direction perpendicular to the rotating shaft and the motor is fixed to the motor fixing rod.

[0028] According to the vehicle seat with the above-mentioned structure, the rotating shaft and the frame of the headrest body in the rotating drive part for rotating the headrest part are of integrated design, with simple structure and strong stability. The headrest body has high stability during rotation and high space utilization rate. Moreover, the rotating shaft is integrally connected with the output shaft of the motor, ensuring that the rotating shaft can be driven to rotate directly and efficiently when the motor rotates, reducing the loss during energy transfer, improving the rotation efficiency, and then driving the frame of the entire headrest body to rotate. By setting a fixing rod integrated with the frame, the motor can be reliably fixed, further improving the overall stability and reliability of the rotating drive part, ensuring that the headrest can rotate smoothly and accurately, and the motor simplifies the installation process.

[0029] Preferably, in the vehicle seat described in the first aspect, the headrest body of the headrest portion is provided with a cutout portion on at least one of the front and the back and on a portion of the bottom surface, and the cutout portion extends downward from the at least one of the front and the back to the bottom surface and continues to extend from the bottom surface toward the direction of the support rod until it reaches the support rod. The setting range of the cutout portion corresponds to at least the area surrounded by the rotating shaft and the pair of support rods. The headrest body also includes a movable portion, which is embedded in the cutout portion of the headrest body, and the movable portion is rotated via a hinge portion provided between the movable portion and the headrest body, thereby switching between closing the cutout portion and opening the cutout portion.

[0030] According to the vehicle seat having the above-mentioned structure, the rotation of the headrest portion can be assisted only by the cooperation between the cutout portion and the movable portion, without the need to design other accessories or complex designs, and without the need for additional operations and additional responses. It has a simple structure, high operability and low cost.

[0031] Preferably, in the vehicle seat described in the first aspect, the support rod of the headrest portion is provided with a locking portion, so that when the rotation drive portion rotates the headrest body and the front side or the back side is in contact with the vehicle ceiling, the movable portion rotates and opens the cutout portion, so that the lower end of the movable portion is locked in the locking portion.

[0032] According to the vehicle seat with the above structure, the support rod is provided with a locking portion. When the headrest body is rotated to a state in contact with the roof, the locking portion cooperates with the movable portion to provide an additional support point for the headrest, thereby further enabling the headrest to maintain a stable position, further enhancing reliability and safety.

[0033] Preferably, in the vehicle seat of the first aspect, the headrest portion further includes a plurality of reinforcing rods connected between the pair of support rods and disposed separately from each other.

[0034] According to the vehicle seat having the above-mentioned structure, the structural strength can be further enhanced by using the reinforcing rod, and when the headrest pops up and abuts against the roof, the stress can be dispersed and additional support can be provided, thereby improving stability and optimizing the supporting effect.

[0035] A second aspect of the present disclosure provides a vehicle, comprising the vehicle seat according to the first aspect.

[0036] According to the vehicle having the above-mentioned structure, since it includes the vehicle seat of the first aspect, the various technical effects mentioned above can also be achieved.

[0037] The basic structure of the vehicle seat and the vehicle of the present disclosure has been described above. Below, by describing specific embodiments with reference to the accompanying drawings, it will be easier to understand the technical solution of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to better understand the present disclosure and do not constitute an improper limitation on the present disclosure.

[0039] Figure 1 is a schematic front view of a normal state of a vehicle seat according to an embodiment of the present disclosure;

[0040] Figure 2 is a schematic rear view of a vehicle seat in a normal state according to an embodiment of the present disclosure;

[0041] Figure 3 is a schematic side view of a normal state of a vehicle seat according to an embodiment of the present disclosure;

[0042] Figure 4 yes Figure 3 AA cross-sectional diagram of ;

[0043] Figure 5 yes Figure 4 An enlarged view of part A in FIG.

[0044] Figure 6 yes Figure 4 An enlarged view of part B in FIG.

[0045] Figure 7 is a view for schematically illustrating the working principle of the vehicle seat according to the embodiment of the present disclosure, wherein the headrest portion is in a normal initial state;

[0046] Figure 8 yes Figure 7 A side view of the state;

[0047] Fig. 9 is a view for schematically illustrating the working principle of the vehicle seat according to the embodiment of the present disclosure, wherein the headrest portion is in an activated state;

[0048] Fig.10 A view schematically showing the working principle of the vehicle seat according to the embodiment of the present disclosure, wherein the headrest portion is in a final state after being activated;

[0049] Fig.11 yes Fig.10 A side view of the state;

[0050] Fig.12 It is a schematic flow chart of the working principle of the vehicle seat of the embodiment of the present disclosure.

[0051] Reference numerals list

[0052] 100 Vehicle Seats

[0053] 1. Backrest

[0054] 11 Skeleton 5

[0055] 2Headrest

[0056] 3 Actuator

[0057] 31 Cylinder body

[0058] 31A Cylinder

[0059] 31B Piston

[0060] G Lower space

[0061] 32 Bias section

[0062] 33 Elastic part

[0063] 34 Sliders

[0064] 35 Support seat

[0065] 36 Support seat support rod

[0066] 37 Switch

[0067] 38 Liquid storage part

[0068] 380 Pressure Relief Valve

[0069] 4 Headrest body

[0070] 41 Skeleton

[0071] 42 Coating material

[0072] 43 Rotation drive unit

[0073] 44 motor (headrest motor)

[0074] 45 Shaft

[0075] 46 Motor fixing rod

[0076] 47 incision

[0077] 48 movable parts

[0078] 49 hinge

[0079] 5 Support rod

[0080] 51 Reinforcement rod

[0081] 52 Carding Department

[0082] 6 Check valve

[0083] 61 valve body shell

[0084] 61A Cylinder end

[0085] 61B Liquid storage end

[0086] 62 Spring

[0087] 63 Ball

[0088] S seal ring DETAILED DESCRIPTION

[0089] Hereinafter, the technical solutions of the present disclosure will be more clearly illustrated by describing specific embodiments of the present disclosure with reference to the accompanying drawings.

[0090] It should be noted that the drawings in the present disclosure are only schematic diagrams for the purpose of clearly showing the parts related to the scheme of the present disclosure, and some non-essential parts that may exist are not shown. Therefore, these drawings should not be understood as limitations on the present disclosure, and they may be different from the actual structure when used. In addition, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", etc. that may appear in the following description to indicate orientation or position are for the purpose of convenience of description and are not restrictive. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0091] Hereinafter, a vehicle seat 100 according to an embodiment of the present disclosure will be described with reference to the drawings.

[0092] like Figure 1 to Figure 3 As shown, the vehicle seat 100 includes a backrest portion 1 and a headrest portion 2 disposed on the backrest portion 1 in a manner that allows it to move up and down. The headrest portion 2 includes a pair of support rods 5, 5 and a headrest body 4 disposed at the top ends of the pair of support rods 5, 5. By inserting the support rods 5, 5 into the backrest portion 1, the headrest portion 2 is mounted to the backrest portion 1 so that the headrest body 4 is located 1 above the backrest portion 1. Both the backrest portion 1 and the headrest body 4 of the headrest portion 2 have a frame and a covering portion that is wrapped around the outside of the frame and is used to contact the occupant. The covering portion may be a common filling material and a surface material. In the disclosed embodiment, the frame of the backrest portion 1 is illustrated as a frame 11, as shown in FIG. Figure 7 As shown in FIG. 1 , the frame of the headrest body 4 is exemplified as the frame 41 and the covering material is exemplified as the covering material 42. Figure 2 , 4 As shown in Figure 1 , 2 As shown, a plurality of reinforcing rods 51 may be separately disposed between the pair of support rods 5, 5, so as to enhance the structural strength and disperse the stress and provide additional support when the headrest pops up and abuts against the roof.

[0093] In the backrest portion 1 of the vehicle seat 100 of the embodiment of the present disclosure, unlike the conventional one, an actuator portion 3 is also provided in the backrest portion 1. The actuator portion 3 can respond to an instruction that the deformation amount of the vehicle roof of the vehicle is above a predetermined threshold value, so that the headrest portion 2 automatically rises so as to contact with and support the vehicle roof, and the actuator portion 3 can maintain the headrest portion 2 in the said supported state.

[0094] The deformation of the vehicle roof mentioned above can be obtained by one or more displacement sensors installed at predetermined positions on the vehicle roof of the vehicle to monitor the status of the vehicle roof in real time. The location of the displacement sensor is not limited and may vary according to the vehicle model and roof structure, but it may be usually located in the center of the roof or in an area susceptible to external force to ensure that the most accurate deformation data can be captured when a collision occurs. The sensor converts the detected deformation of the vehicle roof into an electrical signal and sends it to the on-board ECU (electronic control unit, an example of a control unit). The on-board ECU receives the signal and determines whether the deformation is above a preset threshold value, and performs different subsequent processing based on the judgment result (see below). Fig.12 Flowchart of the .

[0095] In this embodiment, the requirements in the roof pressure test regulations GB 26134-2010 are mainly referred to: when the load is 1.5 times the curb weight of the vehicle (should not exceed 22240N), the deformation of the roof pressure area shall not exceed 127mm, and the preset threshold of the deformation can be set to 100mm. Of course, the setting of the threshold is only an example, and it can also be other values, such as other values ​​between 100 and 127.

[0096] In the vehicle seat 100 of the present embodiment, in addition to the actuating portion 3 that causes the headrest portion 2 to automatically rise and pop up, a rotation driving portion 43 that can automatically rotate the headrest body 4 is also provided. Figure 4 and Figure 5 As shown, the rotation driving unit 43 is disposed in the headrest body 4, and can drive the headrest body 4 to rotate relative to the support rod 5. Similar to the actuating unit 3, the rotation driving unit 43 can also be controlled by the vehicle-mounted ECU, so that when the vehicle-mounted ECU determines whether the deformation amount is above a preset threshold value, it also sends a command to the rotation driving unit 43 at the same time, so that when the rotation driving unit 43 receives the command, it drives the headrest body 4 to rotate relative to the support rod 5, so that the front side of the headrest body 4 for contacting the occupant's head rotates 90 degrees clockwise from the state facing forward to facing upward, and becomes the contact surface contacting the vehicle ceiling.

[0097] The basic structure of the vehicle seat 100 of the present embodiment is described above. With such a structure of the vehicle seat 100, the protection capability of the vehicle top collision can be greatly improved. When the vehicle top is deformed to a certain extent by collision, the headrest portion 2 of the vehicle seat can respond quickly and automatically rise and rotate to achieve contact with the vehicle roof with a large contact area and provide additional support force. With the support of the headrest portion 2, the stability of the roof structure is enhanced to a certain extent, and the roof is prevented from excessive deformation or collapse during a collision, thereby ensuring a safe space for the heads of the occupants in the vehicle, helping to reduce the impact of roof deformation on the occupants in the vehicle, and reducing the risk of injury to the occupants. It can also help to provide the occupants with more escape time and opportunities, reduce the risk of casualties caused by accidents, greatly improve the timeliness and effectiveness of accident response, and ensure safety. The structure for coping with the top collision of the vehicle is integrated into the vehicle seat 100 itself, and does not require additional configuration and assembly of complex external components or additional structures, and will not occupy the space inside the vehicle. By using the headrest portion 2, which is relatively short in distance from the vehicle roof, as a supporting component, a rapid response to the top collision of the vehicle can be achieved, and the vehicle roof can be supported at the fastest speed. Compared with the support structure set in other parts, the response is faster, further improving the safety performance of the vehicle and the survival chance of the occupants.

[0098] The specific configurations of the actuating portion 3 , the rotation driving portion 43 , the switch portion 37 , the liquid reservoir 38 , the check valve 6 , etc. of the vehicle seat 100 of the present embodiment will be described below.

[0099] <Rotation drive unit 43>

[0100] like Figure 4 and Figure 5 As shown, the rotation drive part 43 arranged in the headrest body 4 of the vehicle seat 100 includes: a motor 44; a rotating shaft 45, which is integrated with the frame 41 of the headrest body 4, extends inward from the frame 41 of the headrest body 4 along the seat width direction, and the rotating shaft 45 is integrally connected with the output shaft of the motor 44, so that the rotating shaft 45 rotates under the drive of the motor 44, thereby driving the frame 41 of the headrest body 4 to rotate synchronously; and a motor fixing rod 46, the motor fixing rod 46 is integrated with the frame 41 of the headrest body, extends in a direction perpendicular to the rotating shaft 45 and the motor 44 is fixed to the motor fixing rod 46.

[0101] As for the structure above the rotation drive unit 43, the rotating shaft 45 and the frame 41 of the headrest body are integrated into one design, and the motor fixing rod 46 for fixing the motor 44 is also integrated into the frame 41. The structure is simple and stable. The headrest body 4 has high stability during rotation and high space utilization. Moreover, the rotating shaft is integrally connected to the output shaft of the motor, ensuring that the motor can directly and efficiently drive the rotating shaft to rotate when rotating, reducing the loss during energy transfer, improving the rotation efficiency, and then driving the frame of the entire headrest body to rotate. By setting a fixing rod integral with the frame, the motor can be reliably fixed, further improving the overall stability and reliability of the rotation drive unit, ensuring that the headrest can rotate smoothly and accurately, and the motor simplifies the installation process.

[0102] <Actuation Unit 3>

[0103] like Figure 4 and Figure 6 As shown, the actuating portion 3 of the vehicle seat 100 of the present embodiment is installed in the backrest portion 1, for example, it can be installed in the frame 11 of the backrest portion 1, and the installation method is not limited, as long as it can be installed and fixed to the backrest portion 1. The actuating portion 3 includes: a pair of cylinder portions 31, 31, which are arranged on the outer side of the seat width direction in a one-to-one relationship relative to the pair of support rods 5, 5, and each cylinder portion 31 includes a cylinder 31A and a piston 31B arranged inside the cylinder 31A; a biasing portion 32, which is connected to the respective ends of the pair of support rods 5, 5, and is arranged between the pair of cylinder portions 31, 31 below the ends of the support rods 5, 5 and connected to the upper end of each piston 31B so as to be able to move in conjunction with the piston 31B; a switch portion 37, which is arranged in each cylinder portion 31 and can be switched between a locking position for restricting the movement of the piston 31B and a release position for releasing the locking, wherein at the switch portion 37, the switch portion 37 is When in the locked position, the cylinder 31A has an upper space above the upper end of the piston and a lower space G below the lower end of the piston, and the biasing portion 32 is in a downwardly biased state, and wherein the switch portion 37 can automatically switch from the locked position to the released position in response to the command of the on-board ECU (the deformation of the roof is greater than or equal to a preset threshold value); and a liquid storage portion 38, wherein the liquid storage portion 38 is arranged between a pair of cylinder bodies 31, 31 below the biasing portion 32 and stores hydraulic oil therein, and the liquid storage portion 38 is connected to the corresponding cylinder bodies 31, 31 via the one-way valves 6 on both sides, and through the one-way valve 6, the hydraulic oil is allowed to flow from the liquid storage portion 38 into the lower space G of the cylinder 31A and the hydraulic oil is prohibited from flowing from the lower space G into the liquid storage portion 38.

[0104] The piston 31B of the cylinder body 31 may be provided with a pair of sealing rings S at the lower end of the piston. Figure 4 and Figure 6 As shown. The number of sealing rings S is not limited to a pair in the embodiment, and may be more or one. By using more than one sealing ring S located at the lower end of the piston in the cylinder barrel, the hydraulic oil in the cylinder barrel 31A is effectively prevented from leaking upward from the gap between the lower end of the piston 31B and the cylinder barrel 31A, ensuring that when the piston 31B moves upward, the space G below the cylinder barrel 31A can maintain its hydraulic pressure, thereby enhancing the stability and efficiency of the system. Moreover, when the number of sealing rings S is more than one, when the performance of a single sealing ring is reduced due to wear or aging, other sealing rings can still provide effective sealing to ensure the normal operation of the cylinder body. In addition, since a sealing ring is used at the lower end of the piston, the friction and wear between the lower end of the piston and the cylinder body can be better controlled, and the stability of the hydraulic cylinder during operation can be enhanced, and it can also play a guiding and supporting role. In addition, although not shown, a sealing ring can also be provided on the upper end of the piston 31B. The sealing ring on the upper end of the piston can prevent air, water or other impurities from entering the lower side of the cylinder body through the gap between the upper end of the piston and the cylinder body. Moreover, it can also play a guiding and supporting role to a certain extent, helping the piston to maintain a stable and correct motion trajectory in the cylinder body. In particular, when the piston including the upper end of the piston is integrally formed of metal with the slide rod 34 described later, the guiding and supporting role of the elastic sealing ring is more obvious.

[0105] For the biasing portion 32, if Figure 4 As shown, it may include: a sliding rod 34, which is connected to the ends of a pair of support rods 5, 5 of the headrest portion 2, and the two ends of the sliding rod 34 in the length direction are connected to the upper ends of the corresponding pistons 31B; an elastic portion 33, which is connected to the sliding rod 34 below the sliding rod 34 and can be extended and retracted in the up and down directions; and a support seat 35, which is fixedly connected below the elastic portion 33, and the two ends of the support seat 35 in the length direction are fixed to the cylinder barrels 31A, 31A of each cylinder body portion 31, 31, thereby supporting the elastic portion 33 from below.

[0106] By using the biasing part 32 constructed as above, the support seat 35 is a fixed support member, the elastic part 33 is a force-applying member, and the slide rod 34 is a force-bearing moving member. By using the slide rod 34, it is respectively connected to a pair of support rods 5, 5 of the headrest part 2, the piston upper ends of the pistons 31B, 31B of each cylinder part 31, 31, and the elastic part 33, and can move synchronously with these three. Among them, the slide rod 34 and the piston upper ends of the pistons 31B, 31B and the ends of the support rods 5, 5 can be integrally formed, or can be connected together by welding, bonding, screwing, etc. The connection between the slide rod 34 and the elastic part 33 can also be connected together by various methods such as welding, bonding, etc.; when the elastic part 33 moves, the slide rod 34 can directly drive the headrest part 2 to rise and fall while moving synchronously with the pistons 31B, 31B to start the one-way valve 6, so that one thing can be used for multiple purposes, thereby reducing parts, reducing costs, and taking up less space, and having excellent synchronization and stability. The elastic part 33 is used to provide the lifting force required to drive the headrest part to rise and fall, and can also provide a buffering effect when the headrest part is subjected to external force. The elastic part 33 in this embodiment is, for example, a coil spring as shown in the figure, but this is not restrictive, and can also be an elastic material, an elastic bracket, etc. The support seat 35 is used to ensure the overall stability and reliability of the biasing part 32, and prevent shaking or deviation during movement. The support seat 35 supports the elastic part 33 from below, providing a stable support point for the expansion and contraction of the elastic part 33, which helps to maintain the shape and performance of the elastic part 33. In addition, a slide groove is formed on the cylinder barrel 31A of the cylinder body 31, so that the connection between the upper end of the piston and the slide rod can move along the slide groove.

[0107] In addition, see Figure 4 In addition to the support seat 35 as a support point, the biasing portion 32 may also be provided with a support seat support rod 36, one end of the support seat support rod 36, namely the upper end in the figure, is fixedly connected to the support seat 35, and the other end, namely the lower end in the figure, is fixedly connected to the frame of the backrest 1, so as to support the support seat 35 to the frame 11 of the backrest 1. Thus, the support seat 35 can be further fixed to the backrest by means of the support seat support rod 36, further improving the reliability of fixing the support seat 35, and also improving the reliability of the entire system. The support seat support rod 36 is not limited to the upright form shown in the figure, and the number is not limited to the number shown in the figure. For example, the support seat support rod 36 can also be a number of support seat support rods arranged horizontally.

[0108] <Switch section 37>

[0109] In this embodiment, the switch portion 37 is an electromagnetic latch provided on each cylinder portion 31. In the locking position, each electromagnetic latch is as follows. Figure 4 , 7As shown, it extends into the cylinder barrel 31A of the cylinder body portion 31, thereby locking the upper end of the piston 31B from the upper side of the upper end of the piston. When the on-board ECU determines that the deformation of the vehicle roof is above a preset threshold, the on-board ECU controls the electromagnetic latch to retract from the extended state shown in the figure to a released position for releasing the lock, that is, the position of the upper end of the piston is not locked from above.

[0110] Although the switch parts 37, 37 in this embodiment are exemplified by metal electromagnetic latches, this is not restrictive. For example, other forms such as pneumatic latches, spring lock tongues, etc. can also be used, as long as they can be locked in the initial state and can be released when receiving instructions. In addition, the setting position of the switch parts 37, 37 is not limited to the position radially opposite to the slide bar 34 shown in the figure, as long as it is set at any position on the upper end of the locking piston. In addition, although not shown, a slot that can accommodate the electromagnetic latch can be provided on the radial outer side of the electromagnetic latch of the backrest 1. When the electromagnetic latch is energized, it will generate electromagnetic force and attract the metal electromagnetic latch to be received in the slot, so as to achieve switching to the release position.

[0111] <Check valve 6>

[0112] Figure 6 The one-way valve 6 of this embodiment is shown. The one-way valve 6 is connected between the lower space G of the cylinder tube 31A of each of the left and right cylinder parts 31 and the liquid storage part 38, and includes: a valve body shell 61, a spring 62 and a ball 63; the diameter of the cylinder end 61A of the valve body shell 61 located on the cylinder part 31 side is larger than the diameter of the liquid storage part end 61B located on the liquid storage part 38 side; the diameter of the ball 63 is between the diameter of the cylinder end 61A and the diameter of the liquid storage part end 61B, that is: the diameter of the cylinder end 61A> the diameter of the ball 63> the diameter of the liquid storage part end 61B; and the spring 62 is arranged at the cylinder end 61A relative to the ball 63.

[0113] When the piston 31B moves upward and creates a pressure difference between the cylinder 31A and the liquid storage part 38, the ball 63 in the one-way valve 6 will be pushed toward the cylinder 31A side together with the hydraulic oil by the pressure difference. Since the diameter of the cylinder body end 61A of the valve body shell 61 is larger than the diameter of the ball 63, the hydraulic oil can pass smoothly and enter the space G below the cylinder 31A. When the piston 31B moves upward to the top of the cylinder 31A, it cannot move further. After the lower space G below the piston 31B is filled with hydraulic oil, vacuum and pressure difference are no longer formed. At this time, the ball 63 in the one-way valve 6 will be pushed to the side of the liquid storage part 38 under the thrust of the spring 62 and the return hydraulic oil. Since the diameter of the liquid storage part end 61B of the valve body shell 61 is smaller than the diameter of the ball 63, the ball 63 cannot pass through and blocks the inner cavity of the narrow end with a small diameter of the one-way valve 6, that is, the liquid storage part end 61B. Therefore, the hydraulic oil cannot flow back to the liquid storage part 38.

[0114] In addition, although not shown, a reflux passage may be provided between the liquid storage portion 38 and the cylinder portion 31, and a valve may be provided in the reflux passage. By opening the valve, the hydraulic oil entering the cylinder body can flow back to the liquid storage portion. Accordingly, the hydraulic oil can flow back to the liquid storage portion via the reflux passage, realizing the recycling of the hydraulic oil, reducing the demand for new hydraulic oil, reducing operating costs, and also reducing the burden on the environment caused by the discharge of hydraulic oil, achieving energy conservation and environmental protection.

[0115] <Liquid storage part 38>

[0116] The liquid storage part 38 can be a closed container fixed to the backrest part 1 for storing hydraulic oil, and a pressure relief valve 380 can be set on the top of the liquid storage part 38, so that when the internal pressure of the liquid storage part 38 is too high, a certain pressure can be released through this pressure relief valve 380 to ensure the safety of the device.

[0117] <Headrest section 1>

[0118] As described above, the headrest portion 1 includes a headrest body 4 and a pair of support rods 5, 5. In this embodiment, the headrest body 4 of the headrest portion 1 is provided with a cutout portion 47 on a portion of the back surface and the bottom surface (see Figure 2 , Fig.11 ), the cutout portion 47 extends downward from the back to the bottom surface and continues to extend from the bottom surface toward the direction of the support rods 5, 5 until reaching the support rods 5. The setting range of the cutout portion 47 corresponds to at least the area surrounded by the rotating shaft 45 and the pair of support rods 5, 5. The headrest body 4 also includes a movable portion 48, which is embedded in the cutout portion 47 of the headrest body 4, and the movable portion 48 is rotated via a hinge portion 49 provided between the movable portion 48 and the headrest body 4, thereby switching between closing the cutout portion 47 and opening the cutout portion 47. In other words, the covering material of the headrest body 4 is cut into two parts, one part is the main body part, and the other part is an L-shaped movable module part as the movable portion 48, the movable module part is connected to the main body part by the hinge portion 49 so as to be relatively rotatable, and is embedded in the cutout portion 37 of the main body part, for example, by interference fit. Accordingly, the headrest portion 2 can be rotated only by the cooperation between the cutout portion and the movable portion, without the need to design other accessories or complex designs, and without the need for additional operations and additional responses. The structure is simple, the operability is high, and the cost is low. Any hinge portion can be used for the hinge portion 49.

[0119] In addition, if Figure 5As shown, the support rods 5, 5 of the headrest portion 2 may also be provided with locking portions 52, 52, so that when the rotation drive portion 43 rotates the headrest body 4 and the front side contacts the vehicle ceiling, the movable portion 48 rotates and opens the cutout portion 41, so that the lower end of the movable portion 48 is locked in the locking portions 52, 52 ( Fig.11 As each support rod 5 is provided with a locking portion 51, when the headrest body is rotated to a state in contact with the roof, the locking portion 51 cooperates with the movable portion 48 to provide an additional support point for the headrest portion, further enabling the headrest portion to maintain a stable position, further enhancing reliability and safety. The material of the movable portion 48 may be different from the covering material of the headrest body 4, and the movable portion 48 may include a rigid material, so that when the movable portion 48 is engaged with the locking portions 51, 51, it has a strong support strength.

[0120] The configuration of the main components of the vehicle seat 100 of the present embodiment has been described above with reference to the accompanying drawings. Figure 7-Figure 11 The state diagram and Fig.12 The flowchart of FIG. 1 describes the working principle of how the vehicle seat 100 is protected against a top impact.

[0121] Figure 7 is a view for schematically illustrating the working principle of the vehicle seat according to the embodiment of the present disclosure, wherein the headrest portion is in a normal initial state; Figure 8 yes Figure 7 As shown in the figure, in the initial state, the switch portion 37 is in the locked position, the piston 31B of the cylinder body portion 31 is limited and locked, the elastic portion 33 is compressed, the ball 63 of the one-way valve 6 is at the liquid storage end 61B, and no hydraulic oil flows into the lower space G of the cylinder barrel 31A of the cylinder body portion 31.

[0122] Fig. 9 1 is a view for schematically illustrating the operating principle of the vehicle seat according to the embodiment of the present disclosure, wherein the headrest portion is in an activated state.

[0123] When the vehicle roof is deformed due to an event such as a rollover or heavy pressure, the displacement sensor installed on the vehicle roof can detect the deformation in real time and send the deformation to the vehicle-mounted ECU (an example of a controller). When the deformation is determined to be less than a preset threshold (100 mm in this embodiment), no processing is performed on the vehicle seat 100; and when the deformation is determined to be above the preset threshold, the vehicle-mounted ECU issues a command to perform a control operation. Specifically, the vehicle-mounted ECU controls the switch portion 37 composed of the electromagnetic latch to be energized. When the electromagnetic latch is energized, it will generate an electromagnetic force and attract the electromagnetic latch into the slot. At this time, the electromagnetic latch is pulled out of the vehicle seat 100. Figure 7The locked state of the piston 31B and the slide bar 34 is changed to a released state, the limit locking of the piston 31B and the slide bar 34 is released, the elastic part 33 releases its accumulated elastic potential energy and pushes the slide bar 34 upward to move. Since the slide bar 34 and the upper ends of the pistons 31B on the left and right sides are integrally connected, the slide bar 34 will drive the piston 31B to move upward together, and the upward moving piston will cause a space G below the cylinder below the lower end of the piston to generate a A certain vacuum is created, thereby forming a certain pressure difference between the inside of the cylinder and the inside of the liquid storage part 38, so that the ball 63 in the one-way valve 6 respectively arranged between the liquid storage part 38 and the left and right cylinder parts 31, 31 is pushed toward the cylinder body end 61A together with the hydraulic oil by the pressure difference formed. Since the diameter of the cylinder body end 61A of the valve body shell 61 is larger than the diameter of the ball 63, the hydraulic oil in the liquid storage part 38 will be smoothly sucked from the liquid storage tank 38 into the lower space G of the cylinder 31A. When the piston moves further upward until the upper end of the piston reaches the top of the cylinder barrel of the cylinder body, the piston cannot move further, and the lower space G of the lower end of the piston reaches its maximum and is filled with the incoming hydraulic oil, and no vacuum and pressure difference are formed. At this time, the ball 63 in the one-way valve 6 will be pushed to the side of the liquid storage part, that is, the liquid storage part end 61B, under the thrust of the spring 62 and the return hydraulic oil. Since the diameter of the liquid storage part end 61B is designed to be smaller than the diameter of the ball 63, the ball cannot pass through and blocks the narrow inner cavity of the liquid storage part end 61B of the one-way valve 6, so the hydraulic oil cannot flow back to the liquid storage part 38.

[0124] like Fig.11 As shown in the flowchart, when it is determined that the deformation of the vehicle ceiling is above the preset threshold, the vehicle-mounted ECU not only controls the electromagnetic latch as the switch part 37, but also sends a control signal to the motor (also called the headrest motor) 44 provided in the headrest body 4, so that the headrest motor 44 is turned on and rotates, and the output shaft of the headrest motor 44 is connected to the rotating shaft 45. Therefore, the rotating shaft 45 rotates synchronously under the drive of the output shaft of the headrest motor 44, thereby driving the skeleton 41 of the headrest body, that is, the entire headrest body 4 to rotate. In this embodiment, the rotation of the headrest body is 90 degrees clockwise, so that the headrest body 4 becomes a state with a larger area facing the front of the vehicle ceiling. The rotation speed and angle of the headrest body can be controlled as needed. In addition, along with the rotation of the headrest body 4, the movable part 48 is separated from the state of being embedded in the cutout part 47 due to the interference with the support rod 5, rotates around the hinge part 49, and the lower end is locked in the locking parts 52, 52 on the support rods 5, 5, providing additional support.

[0125] Fig.10 A view schematically showing the working principle of the vehicle seat according to the embodiment of the present disclosure, wherein the headrest portion is in a final state after being activated; Fig.11 yes Fig.10 side view of the state.

[0126] like Fig.10 and Fig.11 As shown, in the final state after the headrest is activated, the headrest body is rotated 90 degrees clockwise and rests against the vehicle ceiling, and the one-way valve 6 is closed to prevent the hydraulic oil in the lower space G of the cylinder from flowing back into the liquid storage part 38. The headrest is supported by the elastic part, the hydraulic part and the movable part. At this time, even if the roof of the vehicle is subjected to downward squeezing force, the squeezing force will be transmitted to the headrest through the roof, and the headrest will transmit this force to the pistons 31B, 31B symmetrically arranged inside the backrest 1 through the support rods 5, 5. After the piston is subjected to force, it will compress the hydraulic oil below. Due to the incompressibility of the hydraulic oil and the one-way valve 6 not allowing the hydraulic oil to flow back, the hydraulic oil will form a supporting force on the bottom surface of the lower end of the piston, and the pressure in the cylinder can be maintained, ensuring that the headrest 2 can withstand the external force transmitted by the roof, ensuring the stability and fixity of the headrest, and preventing shaking or falling back during the collision. Even if the vehicle continues to be impacted or vibrated, the headrest can maintain its position, thereby preventing the roof from further deformation and providing continuous head support and protection for passengers. The hydraulic system is more stable than the spring, and can withstand greater downward pressure, ensuring reliable support. The sealing rings are respectively arranged on the upper end and the lower end of the piston, and the lower end of the piston is a double-channel sealing ring design, which can better ensure that the hydraulic oil will not leak when a strong pressure is applied, thereby improving the stability of the system.

[0127] In addition, the cylinder body, the one-way valve, and the switch part of this embodiment are all symmetrically arranged in a pair, so the description of the corresponding parts is applicable to each of the parts arranged in pairs. In addition, an opening is provided at the top of the backrest for the support rod and the reinforcement rod to move upward. In addition, the vehicle seat can also be provided with an airbag, which can be triggered by the upward pop-up of the headrest part to pop out together, so as to provide multiple protections. In addition, although the present embodiment illustrates the rotation mode of the headrest body rotating 90 degrees clockwise, this is not restrictive; the headrest body can also be rotated 90 degrees counterclockwise by adjusting the direction of the motor so that the back side becomes the contact surface with the vehicle ceiling. In this case, another cutout portion and another movable portion formed symmetrically with the aforementioned cutout portion 47 and movable portion 48 can be provided on the front side of the headrest body, and the rotation principle of the headrest body is the same as that of the clockwise rotation, and can be regarded as being symmetrical with the clockwise rotation; the headrest body can also be rotated 90 degrees counterclockwise and 90 degrees clockwise. In this case, the rotating shaft 45 can be provided at a position closer to the upper end or the lower end than the center of the headrest body, so that the headrest body can be rotated in different rotation directions after rotating. Different positions of the headrest body contact the roof. Therefore, it can be automatically determined whether the headrest body rotates clockwise or counterclockwise according to the position and size of the detected roof deformation. For example, when it is detected that the roof deformation is relatively large behind the backrest, the rotation direction of the headrest body can be controlled so that the headrest body is more located at the rear of the larger deformation after rotation, thereby supporting the roof with a larger area at the rear of the larger deformation. Similarly, when it is detected that the roof deformation is relatively large in front of the backrest, the rotation direction of the headrest body can be controlled so that the headrest body is more located at the front of the larger deformation after rotation, thereby supporting the roof with a larger area at the front of the larger deformation. In this way, it is possible to provide strong support according to the roof deformation in a more targeted manner and resist the roof deformation in a targeted manner. Moreover, the rotation angle of the headrest body is not limited to 90°. Considering the roof curvature of different models, the rotation angle is set to an angle that can make the front or back of the headrest body fit the ceiling as much as possible.

[0128] In summary, the vehicle seat of the embodiment of the present disclosure and the vehicle having the vehicle seat have been described in detail. When the roof of the vehicle tends to deform due to rolling, heavy pressure, etc., the headrest of the vehicle seat can be quickly triggered and popped up and flipped, thereby supporting the vehicle roof, which enhances the stability of the roof structure to a certain extent, prevents the roof from excessively deforming or collapsing during a collision, ensures the head safety space of the occupants in the vehicle, helps to reduce the impact of the roof deformation on the occupants in the vehicle, reduces the risk of injury to the occupants, and can also help to provide the occupants with more escape time and opportunities, reduce the risk of casualties caused by accidents, greatly improve the timeliness and effectiveness of accident response, and ensure safety. Moreover, the development and maintenance costs of the various components for top collision response in the vehicle seat of the embodiment of the present invention are low, and can be used repeatedly; in contrast, the passive safety system of the airbag type cannot be used repeatedly after being triggered and detonated, and the use cost is relatively high; in addition, the present embodiment can also improve and enhance the scoring results of the vehicle in relevant collision tests.

[0129] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A vehicle seat (100), comprising: Backrest (1); A headrest portion (2), the headrest portion (2) being arranged on the backrest portion (1) in a manner capable of moving up and down; as well as an actuating portion (3), the actuating portion (3) being arranged in the backrest portion (1), the actuating portion (3) automatically raising the headrest portion (2) so as to contact with and support the vehicle roof in response to an instruction that the amount of deformation of the vehicle roof is greater than a predetermined threshold, and the actuating portion (3) maintaining the headrest portion (2) in a supported state, The headrest portion (2) comprises a pair of support rods (5, 5) and a headrest body (4) arranged at the top ends of the pair of support rods, and the headrest portion (2) is mounted to the backrest portion (1) by inserting the support rods (5, 5) into the backrest portion (1) so that the headrest body (4) is located above the backrest portion (1), and The headrest body (4) is provided with a rotation drive unit (43) capable of driving the headrest body (4) to rotate relative to the support rods (5, 5); the rotation drive unit (43) drives the headrest body (4) to rotate relative to the support rods (5, 5) in response to the instruction, so that the front side of the headrest body (4) for contacting the occupant's head or the back side opposite to the front side becomes the contact surface with the vehicle ceiling.

2. The vehicle seat (100) according to claim 1, wherein: The actuating portion (3) comprises: A pair of cylinder parts (31), the pair of cylinder parts (31) are arranged on the outer sides in the seat width direction in a one-to-one relationship with respect to the pair of support rods (5, 5), and each of the cylinder parts (31) includes a cylinder barrel (31A) and a piston (31B) arranged inside the cylinder barrel; A biasing portion (32), the biasing portion (32) being connected to the ends of the support rods (5, 5), being disposed between the pair of cylinder portions (31, 31) below the ends of the support rods (5, 5) and being connected to each of the pistons (31A, 31A), so as to be able to move in conjunction with the pistons (31A, 31A); a switch portion (37, 37), the switch portion (37, 37) being arranged on each of the cylinder portions (31, 31) and being capable of switching between a locking position for restricting movement of the piston (31A, 31A) and a release position for releasing the locking, wherein when the switch portion (37, 37) is at the locking position, the cylinder has an upper space above the upper end of the piston and a lower space (G) below the lower end of the piston, and the biasing portion (32) is in a downwardly biased state, and wherein the switch portion (37, 37) automatically switches from the locking position to the release position in response to the instruction; and A liquid storage section (38), wherein the liquid storage section (38) is arranged between the pair of cylinder sections (31, 31) below the biasing section (32) and stores hydraulic oil therein, and the liquid storage section (38) is connected to the corresponding cylinder sections (31, 31) via one-way valves (6, 6) on both sides, and the one-way valve (6) allows the hydraulic oil to flow from the liquid storage section (38) into the lower space (G) of the cylinder and prohibits the hydraulic oil from flowing from the lower space (G) into the liquid storage section (38).

3. The vehicle seat (100) according to claim 2, wherein: The cylinder body (31, 31) further comprises: a sealing ring arranged at the upper end of the piston in the cylinder barrel (31A, 31A); and one or more sealing rings (S) arranged at the lower end of the piston in the cylinder barrel.

4. The vehicle seat (100) according to claim 2 or 3, wherein: The biasing portion (32) comprises: A slide rod (34), the slide rod (34) being connected to the ends of the support rods (5, 5) of the headrest portion (2), and the two ends of the slide rod (34) in the length direction being connected to the upper ends of the corresponding pistons (31B, 31B); an elastic portion (33), the elastic portion (33) being connected to the slide bar (34) below the slide bar (34) and being capable of extending and retracting in an up-and-down direction; and A support seat (35) is fixedly connected below the elastic part (33), and both ends of the support seat (35) in the length direction are fixed to the cylinder barrels (31A, 31A) of each cylinder body part (31, 32), so as to support the elastic part (33) from below.

5. The vehicle seat (100) according to claim 4, wherein: The biasing portion (32) further comprises: A support seat support rod (36), one end of which is fixedly connected to the support seat (35) and the other end of which is fixedly connected to the frame of the backrest (1), so as to support the support seat (35) on the frame of the backrest (1).

6. The vehicle seat (100) according to any one of claims 2 to 5, wherein: The switch part (37, 37) is an electromagnetic latch provided on each of the cylinder parts (31, 31). In the locking position, the electromagnetic latch extends into the cylinder barrel (31A, 31A) of the cylinder part (31, 31) to lock the upper end of the piston (31B, 31B) from the upper side of the upper end of the piston; and in response to the command, the electromagnetic latch retracts from the extended state to the release position to release the locking.

7. The vehicle seat (100) according to any one of claims 2 to 6, wherein: Each of the one-way valves (6) comprises: a valve body shell (61), a spring (62) and a ball (63); the diameter of the cylinder end (61A) of the valve body shell (61) located on the cylinder body (31) side is larger than the diameter of the liquid storage end (61B) located on the liquid storage (38) side; the diameter of the ball (63) is between the diameter of the cylinder end (61A) and the diameter of the liquid storage end (61B), that is: the diameter of the cylinder end (61A)> the diameter of the ball (63)> the diameter of the liquid storage end (61B); and the spring (62) is arranged at the cylinder end (61A) relative to the ball (63).

8. The vehicle seat (100) according to claim 7, wherein: A reflux passage is also provided between the liquid storage portion (38) and the cylinder portion (31, 31), and a valve is provided in the reflux passage. By opening the valve, the hydraulic oil entering the cylinder can flow back into the liquid storage portion.

9. The vehicle seat (100) according to any one of claims 1 to 8, wherein: The rotating drive unit (43) comprises: a motor (44); a rotating shaft (45), wherein the rotating shaft (45) is integrated with the frame (41) of the headrest body (4), extends inward from the frame of the headrest body along the seat width direction, and the rotating shaft (45) is integrally connected with the output shaft of the motor (44), so that the rotating shaft (45) rotates under the drive of the motor (44) to drive the frame (41) of the headrest body (4) to rotate; and a motor fixing rod (46), wherein the motor fixing rod (46) is integrated with the frame (41) of the headrest body, extends in a direction perpendicular to the rotating shaft (45), and the motor (44) is fixed to the motor fixing rod (46).

10. The vehicle seat (100) according to claim 9, in, The headrest body (4) of the headrest portion (2) is provided with a cutout portion (47) on at least one of the front and back sides and a portion of the bottom side, wherein the cutout portion (47) extends downward from the at least one of the front and back sides to the bottom side and continues to extend from the bottom side toward the support rod (5, 5) until reaching the support rod. The arrangement range of the cutout portion (47) at least corresponds to the area surrounded by the rotating shaft (45) and the pair of support rods (5, 5), and The headrest body (4) further includes a movable portion (48), wherein the movable portion (48) is embedded in the cutout portion (47) of the headrest body, and the movable portion (48) is rotated via a hinge portion provided between the movable portion (48) and the headrest body (4), thereby switching between closing the cutout portion (47) and opening the cutout portion (47).

11. The vehicle seat (100) according to claim 10, wherein: The support rods (5, 5) of the headrest portion (2) are respectively provided with locking portions (52, 52), so that when the rotation drive portion (43) rotates the headrest body (4) and the front face or the back face is in contact with the vehicle ceiling, the movable portion (48) rotates and opens the cutout portion (47), so that the lower end of the movable portion (48) is locked in the locking portions (52, 52).

12. A vehicle, comprising a vehicle seat (100) according to any one of claims 1-11.

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