Automobile seat backrest assembly

Abstract

The utility model discloses an automobile seat backrest component, which is characterized by comprising a seat back, a backrest, a seat back driving part and a backrest driving part, and the bottom of the seat back is rotatably mounted on a cross beam; the backrest is arranged on the front side of the chair back, and the bottom of the backrest is rotationally connected with the bottom of the chair back or the cross beam; the chair back driving part drives the chair back to rotate around the cross beam, and when the chair back rotates, the backrest is synchronously driven to rotate along with the chair back; and the backrest driving part drives the backrest to rotate around the chair back. The strength and the safety of the backrest are improved, the potential safety hazard is reduced, and the maintenance convenience is also improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to an automobile seat, especially an automobile seat backrest assembly. BACKGROUND

[0002] The automobile seat is the necessary configuration of the interior trim of the automobile, and is the most direct manifestation that the owner perceives whether the vehicle is comfortable or not, and the main factor influencing the comfort of the seat is still the man-machine engineering design of the seat.

[0003] The automobile seat mainly includes a backrest, a cushion and a headrest, and the bottom of the backrest is directly rotatably installed at the rear side of the cushion in the normal automobile seat, and the backrest is synchronously driven to move when the cushion moves.

[0004] 1. When some articles need to be loaded in the trunk of the vehicle, the seat is folded to make the backrest close to the cushion, and the articles can be placed on the folded backrest, in this way, the articles can damage the backrest, resulting in high maintenance rate;

[0005] 2. The backrest and the cushion are connected, and if the vehicle is hit, the buffering capacity of the backrest is insufficient, and there is a great safety hazard;

[0006] 3. The backrest only has a metal internal framework, and the backrest is easy to deform when the rear side is hit by external force, and the safety is not good enough;

[0007] 4. If the backrest needs to be repaired, the entire seat needs to be disassembled for repair, and the repair is not convenient;

[0008] 5. When the position of the cushion is adjusted, the backrest will move with it, affecting the use experience. SUMMARY

[0009] The utility model aims at providing an automobile seat backrest assembly, through using the structure, can improve the strength and use safety of the automobile seat, and reduce the maintenance rate.

[0010] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of an automobile seat backrest assembly, which comprises:

[0011] A backrest is rotatably installed on a cross beam at the bottom of the backrest;

[0012] A backrest is arranged on the front side of the backrest, and the bottom of the backrest is rotatably connected with the bottom of the backrest or the cross beam;

[0013] A backrest driving part drives the backrest to rotate around the cross beam, and when the backrest rotates, the backrest is synchronously driven to rotate with the backrest;

[0014] A backrest driving part drives the backrest to rotate around the chair back or the crossbeam.

[0015] In the technical solution, the backrest driving part comprises a backrest motor and a first gear, the backrest motor is installed on the backrest, a first tooth plate is installed on the crossbeam, the first gear is engaged with the first tooth plate, the backrest motor drives the first gear to rotate and drives the backrest to rotate around the crossbeam.

[0016] In the technical solution, the rotation connection between the backrest and the crossbeam is coaxially arranged with the axis of the first tooth plate.

[0017] In the technical solution, a first connecting gear is further installed on the backrest in a rotating manner, one side of the first connecting gear is engaged with the first gear, and the other side of the first connecting gear is engaged with the first tooth plate.

[0018] In the technical solution, the backrest driving part comprises a backrest motor, a second gear and a second tooth plate, the second gear is engaged with the second tooth plate, and the backrest motor drives the second gear to rotate.

[0019] The second tooth plate is installed on the backrest, the backrest motor is installed on the backrest, and when the backrest motor drives the second gear to rotate, the bottom of the backrest is driven to rotate around the chair back or the crossbeam.

[0020] Alternatively, the second tooth plate is installed on the backrest, the backrest motor is installed on the backrest, and when the backrest motor drives the second gear to rotate, the bottom of the backrest is driven to rotate around the chair back or the crossbeam.

[0021] In the technical solution, a headrest is further included, the headrest is installed on the top of the backrest through at least two headrest rods, and the headrest can move up and down relative to the headrest rods.

[0022] In the technical solution, a headrest up-and-down driving part for driving the headrest to move up and down along the headrest rods is further arranged in the headrest, the headrest up-and-down driving part comprises a first headrest motor and a first headrest gear installed in the headrest, a headrest rod rack is arranged on at least one of the headrest rods, the headrest rod rack is arranged along the length direction of the headrest rod, the first headrest gear is engaged with the headrest rod rack, and the first headrest motor drives the first headrest gear to rotate and drives the headrest to move up and down relative to the headrest rod through the headrest rod rack.

[0023] In the technical scheme, the headrest comprises a rear headrest part and a front headrest part, the rear headrest part is mounted on the headrest rod, the top rear side of the front headrest part is rotationally connected with the top front side of the rear headrest part, and the headrest up-down driving part is mounted in the rear headrest part;

[0024] And / or, the rear headrest part is further provided with a headrest rotation driving part for driving the front headrest part to rotate around the rear headrest part.

[0025] In the technical scheme, the front headrest part comprises a middle headrest and two side headrests, the rear end top of the middle headrest is rotationally connected with the top front side of the rear headrest part, the two side headrests are symmetrically arranged on the two sides of the middle headrest, the inner end of each side headrest is rotationally connected with the side of the middle headrest through a damping part, and the headrest rotation driving part drives the middle headrest to rotate around the rear headrest part.

[0026] In the technical scheme, the side wall of the chair back is provided with a locking limiting part, and the locking limiting part can limit the chair back on the automobile.

[0027] Due to the technical scheme, the utility model has the following advantages compared with the prior art:

[0028] 1. In the utility model, the backrest assembly is composed of a backrest and a chair back, the chair back is directly rotationally connected with the cross beam and is not connected with the cushion, so that the backrest assembly cannot be adjusted when the cushion is adjusted, the backrest assembly is independently adjusted, and the user's experience can be effectively improved.

[0029] 2. In the utility model, the chair back is arranged on the rear side of the backrest, the impact resistance of the backrest can be effectively improved, the strength of the backrest assembly as a whole is improved, and the strength and safety of the automobile seat are improved.

[0030] 3. In the utility model, the chair back is arranged on the rear side of the backrest, after the backrest assembly is folded, the article can be placed on the chair back, the backrest is not damaged, the maintenance rate is effectively reduced, and when maintenance is performed, the backrest assembly only needs to be disassembled, the entire seat does not need to be disassembled, and the maintenance difficulty is also reduced.

[0031] 4. In the utility model, the backrest can be adjusted when the chair back is adjusted, the backrest can be independently adjusted when the backrest is adjusted, the angle of adjustment is larger, and the comfort of the user is improved.

[0032] 5. In the utility model, the locking limiting part capable of being locked with the automobile is further arranged on the side wall of the chair back, so that the bottom of the chair back is not only limited by the cross beam, but also the top of the chair back can be limited by the automobile, the strength and impact resistance of the backrest assembly are effectively improved, the safety is improved, and the safety hidden danger is reduced.

[0033] 6. The utility model discloses a headrest upper and lower drive part is arranged in the headrest, and the headrest is driven to move up and down relative to the headrest rod through the headrest upper and lower drive part, compared with the structure that the headrest upper and lower drive part is arranged on the backrest in the past, can reduce the occupation of backrest space, and it is convenient for the upgrading of backrest function, simultaneously, when the headrest upper and lower drive part needs maintenance, only needs to disassemble the headrest, improves the convenience of maintenance, reduces the difficulty of maintenance.

[0034] 7. The utility model discloses a headrest includes front side headrest part and rear side headrest part, and the front side headrest part can rotate or move relative to the rear side headrest part, so that the distance and the inclination angle of the front side headrest part relative to the rear side headrest part can be adjusted, and the position and the angle of the headrest of user's convenience can be according to, improve the comfort of user. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is structure schematic diagram (headrest is not shown) in the utility model embodiment one (headrest is not shown, the state of exhibition of coil spring is shown);

[0036] Figure 2 It is structure schematic diagram (headrest is not shown, the state of exhibition of coil spring is shown) in the utility model embodiment one (headrest is not shown, the state of exhibition of coil spring is shown);

[0037] Figure 3 It is Figure 2 structure schematic diagram of chair back drive part (chair back and backrest part are not shown, and the chair back drive part is exposed) in the utility model embodiment one;

[0038] Figure 4 It is structure schematic diagram (headrest is not shown, and the side view of backrest drive part) in the utility model embodiment one;

[0039] Figure 5 It is Figure 4 structure schematic diagram (chair back and backrest part are not shown, and the backrest drive part is exposed) in the utility model embodiment one;

[0040] Figure 6 It is structure schematic diagram (two automobile seats are installed simultaneously) in the utility model embodiment one automobile seat installation state;

[0041] Figure 7 It is structure schematic diagram of headrest in the utility model embodiment one;

[0042] Figure 8 It is structure schematic diagram of headrest in the utility model embodiment one (the internal structure exhibition state of rear side headrest part);

[0043] Figure 9 It is Figure 8 sectional view structure schematic diagram (the sectional view state of first headrest gear and headrest rod rack connection) in the utility model embodiment one.

[0044] Figure 10 is Figure 8 is a sectional structure schematic view (in a sectional view state of a second headrest gear and a longitudinal rack connection part) of

[0045] Figure 11 is a structure schematic view of a headrest in the embodiment one of the utility model (in a rear side headrest part internal structure display state, part mechanism in rear side headrest part internal is not displayed);

[0046] Figure 12 is Figure 11 is a sectional structure schematic view of

[0047] Figure 13 is a structure schematic view of the gear and the front side headrest part connection part in the embodiment one of the utility model (the front side headrest part display part).

[0048] 1, cushion assembly;2, backrest assembly;3, crossbeam;21, chair back;22, backrest;23, headrest;24, headrest rod;25, chair back drive part;26, backrest drive part;31, crossbeam connecting shaft;32, crossbeam connecting plate;33, coil spring;210, locking limiting piece;

[0049] 230, headrest up and down drive part;231, rear side headrest part;232, front side headrest part;233, headrest rotary drive part;234, gear;240, headrest rod rack;250, chair back motor;251, first gear;252, first toothed plate;253, first arc-shaped slot;254, first limiting rod;255, first connecting gear;260, backrest motor;261, second gear;262, second toothed plate;263, second arc-shaped slot;

[0050] 2301, first headrest motor;2302, first headrest gear;2303, first headrest gear connecting rod;2320, middle head support;2321, side head support;2331, second headrest motor;2332, second headrest gear;2333, headrest push part;2334, longitudinal rack;2335, second headrest gear connecting rod;2340, push piece;2341, arc-shaped rack;2342, tension spring;2343, reset piece;2344, push gear;2345, convex gear;2346, disengagement slope. DETAILED DESCRIPTION

[0051] The utility model will be further described in connection with the drawings and embodiments:

[0052] Embodiment one: refer to Figures 1-13 as shown, a kind of automobile seat backrest assembly, comprising:

[0053] A chair back 21, the bottom of which is pivotally mounted on a cross beam 3;

[0054] A backrest 22, which is arranged on the front side of the chair back 21, the bottom of which is pivotally connected with the bottom of the chair back 21 or the cross beam 3;

[0055] A chair back driving part 25, which drives the chair back 21 to rotate around the cross beam 3, and when the chair back 21 rotates, the backrest 22 is driven to rotate synchronously with the chair back 21;

[0056] A backrest driving part 26, which drives the backrest 22 to rotate around the chair back 21 or the cross beam 3.

[0057] In the embodiment, the cross beam is directly mounted on the automobile, wherein the cross beam is mounted on the inside of the automobile, which can be directly mounted on the bottom surface of the car compartment or fixed on the frame inside the car compartment, wherein the automobile seat comprises a backrest assembly 2 and a seat cushion assembly 1, the bottom of the seat cushion assembly is mounted on the automobile through a seat cushion slide rail, and the seat cushion assembly is arranged on the front side of the backrest assembly, when the seat cushion assembly is adjusted in the front-rear direction along the seat cushion slide rail, the backrest assembly does not move simultaneously with the seat cushion assembly. The chair back is mainly made of metal material, such as aluminum profile or steel profile, which has high strength, and the backrest is arranged on the front side of the chair back, in this way, when the automobile is impacted from the back, the chair back can provide certain protection and increase the safety performance. At the same time, when the backrest assembly is folded (the backrest and the chair back are flipped forward and close to or attached to the seat cushion assembly, so that the back side of the chair back is basically parallel to the bottom of the car compartment), when the automobile is used to store things, the things are placed on the chair back, which will not damage the backrest and protect the backrest. Especially when the backrest is a multifunctional backrest, such as having ventilation, heating, massage and waist support adjustment functions (the backrest in the utility model has the functions), if the things are placed on the folded backrest, the various functional components inside the backrest may be damaged, and the arrangement of the chair back can protect the backrest and prevent the damage of the functional components inside the backrest, thereby reducing the maintenance rate. The chair back can be flipped by 180 degrees or even more than 180 degrees, when the chair back is flipped backward to the maximum, the back side of the chair back abuts against the cross beam, thereby supporting and limiting the chair back, and when the chair back is flipped forward, the chair back can be flipped to abut against the seat cushion assembly.

[0058] The setting of the chair back driving part can drive the chair back to rotate around the cross beam, and when the chair back rotates, the backrest and the backrest driving part will rotate simultaneously, and then the large-angle rotation adjustment of the backrest is realized. When the chair back driving part drives the chair back and the backrest to rotate simultaneously, by separately setting the backrest driving part, the backrest driving part is used to drive the small-angle rotation of the backrest relative to the chair back, that is, the backrest is adjusted by a certain angle, so as to improve the comfort of the user.

[0059] Further, referring to FIGS. 21 and 22, Figure 1 、 6 As shown in FIGS. 21 and 22, the side wall of the chair back 21 is provided with a locking limiting part 210, which can limit the chair back 21 on the car. Preferably, the locking limiting part is provided on the B pillar of the car (if the car has a third row, it is provided on the car beside the third row position, generally not installed on the driver's seat, if the car is a two-seater car, it can also be installed on the driver's seat and the front passenger seat, and the locking limiting part is provided on the car beside the corresponding position), and in this embodiment, the car seat is installed on the rear row position as an example. In the unfolded state of the chair back (flipped back away from the cushion assembly), the locking limiting part is connected with the locking limiting part of the car, so that the upper and lower parts of the backrest assembly can be limited (after the locking limiting part is connected with the locking limiting part of the car, the lower part is limited by the cross beam), preventing the backrest assembly from being flipped forward (the backrest assembly is rotated towards the top of the cushion assembly) due to impact, reducing the possibility of the backrest assembly being flipped forward after being stressed, and reducing the safety hazard (in the previous car seat, the backrest is directly connected with the cushion, and the angle adjustment structure is limited by the motor or manual structure itself. When an external impact force is applied, the connection is extremely easy to damage, causing a high safety risk). For example, the locking limiting part is a square buckle, or an arc buckle, or other types of ring buckle (a ring-shaped metal part), and the locking limiting part adopts an electronic lock buckle or a relatively low-cost safety buckle. When the chair back is flipped back, the locking limiting part touches the safety buckle (for example, the safety buckle), presses the rotating part of the safety buckle, and after completely entering the safety buckle, the rotating part of the safety buckle is reset, so that the safety buckle is connected with the locking limiting part and limits the locking limiting part. When the chair back is flipped forward, press the rotating part of the safety buckle with your hand to open the safety buckle. After the chair back is rotated and the locking limiting part is separated from the safety buckle, release the rotating part of the safety buckle to make the chair back normally rotate forward. Of course, the locking limiting part can also adopt a safety buckle, and the locking limiting part can adopt a ring buckle. Of course, the locking limiting part and the locking limiting part can be electric structures, which can realize the functions of locking and unlocking.

[0060] In this embodiment, the cross beam connecting shaft 31 is arranged, the front bottom side of the backrest is rotatably connected with the cross beam connecting shaft, and the rear bottom side of the backrest is also rotatably connected with the cross beam connecting shaft. Preferably, in this embodiment, the cross beam is provided with a pair of cross beam connecting plates 32 extending forward, and two cross beam connecting plates are arranged corresponding to one set of backrest assembly. If two sets of backrest assemblies are arranged on the cross beam, four cross beam connecting plates are arranged on the cross beam, and one cross beam connecting shaft is arranged on each cross beam connecting plate. The two sides of the front end of the bottom of the backrest are rotatably connected with two cross beam connecting shafts respectively, and the two sides of the rear end of the bottom of the backrest are also rotatably connected with two cross beam connecting shafts respectively. In this structure, the backrest driving part is close to one cross beam connecting shaft, and the backrest driving part is close to the other cross beam connecting shaft. If only one cross beam connecting shaft is used (the two ends of the cross beam connecting shaft are connected with two cross beam connecting plates respectively), the backrest driving part and the backrest driving part are arranged at the two ends of the cross beam connecting shaft respectively, which is convenient for the layout of the backrest driving part and the backrest driving part.

[0061] Referring to Figure 3 As shown in the figure, the backrest driving part 25 includes a backrest motor 250 and a first gear 251, the backrest motor 250 is installed on the backrest 21, a first tooth plate 252 is installed on the cross beam 3, the first gear 251 is engaged with the first tooth plate 252, the backrest motor 250 drives the first gear 251 to rotate, and drives the backrest 21 to rotate around the cross beam 3.

[0062] In this embodiment, the two sides of the backrest are respectively rotated on the two beam connecting shafts, the tooth pieces outside the first tooth plate (the first arc-shaped gear rack) are coaxially arranged on the beam and are mounted on the beam, which can be fixedly mounted on the beam connecting shaft or the beam connecting plate, and the backrest motor is mounted on the front side of the backrest between the backrest and the back support, which is hidden by the backrest and the back support and is more beautiful. The output shaft of the backrest motor is connected with the first gear, or the backrest motor is connected with the first gear through a reduction mechanism, which is used to drive the first gear to rotate, and the first gear is rotatably mounted on the backrest. In this way, the position of the first gear can be always kept unchanged, and the engagement degree with the first gear can be ensured (if the first gear is only connected with the output shaft of the backrest motor or the reduction mechanism, the connection position of the first gear with the backrest motor or the reduction mechanism is easy to be deformed and damaged under force). The outer surface of the first tooth plate 252 is provided with a first arc-shaped gear rack, and the first tooth plate is provided with a first arc-shaped groove 253. The first gear is engaged with the first arc-shaped gear rack of the first tooth plate, and the backrest is provided with a first limiting rod 254 which is inserted into the first arc-shaped groove 253. The first limiting rod can move in the first arc-shaped groove. When the first gear is driven to rotate by the backrest motor, the rotating connection position of the backrest and the beam is coaxially arranged with the axis of the first tooth plate, the first arc-shaped gear rack, the first arc-shaped groove and the beam connecting shaft are coaxially arranged, and the first tooth plate is fixed. Therefore, when the first gear rotates, the first gear will rotate around the first tooth plate, and the first limiting rod will also move along the first arc-shaped groove, so as to drive the backrest to rotate around the beam, thereby realizing the adjustment of the angle of the backrest. The first arc-shaped groove and the first limiting rod can limit the rotating angle of the backrest relative to the beam. Preferably, the rotating angle of the backrest is within 180 degrees or about 180 degrees, and according to the actual situation, the first arc-shaped groove with the required length can be opened, and the length of the first arc-shaped gear rack is greater than that of the first arc-shaped groove, so as to prevent the tooth falling phenomenon.

[0063] Further, referring to Figure 3 As shown in the figure, the first connecting gear 255 is rotatably mounted on the backrest 21, one side of the first connecting gear 255 is engaged with the first gear 251, and the other side of the first connecting gear 255 is engaged with the first tooth plate 252 (engaged with the first arc-shaped gear rack).

[0064] If the first gear and the first toothed plate are directly engaged, the size of the first gear is not well designed, the transmission ratio is not well adjusted, or according to the size of the chair back and the backrest, the position of the chair back motor is not well laid out, or other reasons, etc. Therefore, a first connecting gear is also provided for adjusting the transmission ratio, facilitating control of the speed of the chair back, or the position of the chair back motor can be optimally designed, or other. Of course, the first connecting gear can also not be provided. When the first gear rotates, the first connecting gear also rotates with it. Since the first connecting gear and the first toothed plate are engaged, the first connecting gear will rotate around the first toothed plate, thereby driving the chair back to rotate around the first toothed plate (cross beam).

[0065] Referring to Figure 4 、 5 As shown in FIG. 26, the backrest driving part 26 includes a backrest motor 260, a second gear 261, and a second toothed plate 262, the second gear 261 is engaged with the second toothed plate 262, and the backrest motor 260 drives the second gear 261 to rotate.

[0066] In the utility model, the installation position of the backrest driving part has two kinds, the first kind: the second toothed plate is installed on the chair back, the backrest motor is installed on the backrest, and when the backrest motor drives the second gear to rotate, the bottom of the backrest is driven to rotate around the chair back or cross beam.

[0067] The second kind: the second toothed plate 262 is installed on the backrest 22, the backrest motor 260 is installed on the chair back 21, and when the backrest motor 260 drives the second gear 261 to rotate, the bottom of the backrest 22 is driven to rotate around the chair back 21 or cross beam 3. In this embodiment, the second structure is adopted.

[0068] In the utility model, no matter which kind of installation position of the backrest driving part is adopted, the rotation of the second gear can be driven by the backrest motor, and the backrest is driven to rotate around the chair back or cross beam through the engagement of the second gear and the second toothed plate.

[0069] The chair back is connected with the cross beam connection shaft, the backrest is also connected with the cross beam connection shaft, or the backrest and the chair back are connected, and the rotation connection position of the backrest and the chair back is coaxial with the rotation connection position of the chair back and the cross beam. Therefore, the backrest can rotate relative to the cross beam or the chair back. In the embodiment, the backrest is connected with two cross beam connection shafts, the second gear is mounted on the backrest, the backrest motor is mounted on the chair back, and the output shaft of the backrest motor is connected with the second gear or connected with the second gear through a speed reduction mechanism. When the backrest motor drives the second gear to rotate, the second gear pushes the second gear plate to rotate around the cross beam connection shaft, thereby driving the backrest to rotate relative to the cross beam connection shaft. Since the chair back does not rotate at this time, the backrest rotates relative to the chair back, thereby adjusting the angle of the backrest.

[0070] In the embodiment, the chair back driving part is arranged on one cross beam connection shaft side, the backrest driving part is arranged on the other cross beam connection shaft side, and the backrest driving part is arranged between the chair back and the backrest, so as not to be exposed and more beautiful. The chair back driving part and the backrest driving part are arranged on the two sides of the backrest, so as to be convenient to arrange and prevent the chair back driving part and the backrest driving part from interfering with each other. The second arc-shaped groove 263 is arranged on the second gear plate 262, the rotation connection position of the backrest 22 and the chair back 21 is coaxial with the second arc-shaped groove 263, or the rotation connection position of the backrest and the cross beam is coaxial with the second arc-shaped groove. In the embodiment, the second arc-shaped groove is coaxial with the cross beam connection shaft, and the second arc-shaped groove is provided with a second arc-shaped gear rack on the top surface or the bottom surface. The second gear is arranged in the second arc-shaped groove and meshes with the second arc-shaped gear rack. In this way, the rotation angle of the backrest is limited due to the length of the second arc-shaped groove and the second arc-shaped gear rack. When the chair back rotates and drives the backrest to rotate, the angle of the backrest can be adjusted independently, and the rotation angle of the backrest relative to the chair back is limited by the second arc-shaped groove, so that the backrest can be adjusted by a certain angle relative to the chair back, thereby improving the comfort of the user.

[0071] Wherein, when the backrest is angle-adjusted, the backrest driving part will not work, i.e. the second gear will not rotate, and the relative position of the second gear and the second toothed plate will not change due to the engagement of the second gear and the second toothed plate, at this time, the backrest and the backrest are equivalent to a whole structure, therefore, when the backrest motor drives the first gear to rotate, it will drive the backrest and the backrest to rotate around the crossbeam at the same time, and drive the whole backrest assembly to be angle-adjusted, and when the backrest motor does not work, the backrest motor works alone, which will drive the backrest to rotate relative to the backrest, and adjust the angle of the backrest alone (when the passenger sits on the cushion assembly, the passenger's back will lean against the backrest, and the backrest will support the passenger's back, and the passenger's back and waist will not contact the backrest).

[0072] Meanwhile, in the embodiment, the backrest is locked with the vehicle alone, and the backrest is not locked with the vehicle, in this way, when the backrest is angle-adjusted alone, the backrest does not need to be unlocked with the vehicle, and the safety is higher. Moreover, the backrest assembly adopts the structure of the backrest and the backrest, which is not only safer, but also more beautiful, and the whole seat is more atmospheric.

[0073] Furthermore, two coil springs 33 (or torsion springs) are sleeved on one of the crossbeam connecting shafts, the inner ends of the two coil springs are connected with the crossbeam connecting shaft, the outer end of one of the coil springs is connected with the backrest, and the outer end of the other coil spring is connected with the backrest, in this way, a pre-tightening force can be applied to the backrest and the backrest by the corresponding coil springs, so that the backrest and the backrest are more stable and more labor-saving during angle adjustment, and the stability is higher (there is a little gap between the gear and the toothed plate, so there may be a problem of shaking, and the pre-tightening force is applied to the backrest and the backrest by the coil spring to prevent the shaking and make it more stable).

[0074] Referring to Figures 6-13 As shown in the figure, it also includes a headrest 23, the headrest 23 is installed on the top of the backrest 22 through at least two headrest rods 24, the bottom of the headrest rod 24 is connected with the top of the backrest 22, and the headrest 23 can move up and down relative to the headrest rod 24. When the backrest is rotated, the headrest will also be rotated at the same time to adjust the angle.

[0075] The headrest 23 is internally provided with a headrest up-down driving part 230 for driving the headrest 23 to move up and down along the headrest rod 24, the headrest up-down driving part 230 comprises a first headrest motor 2301 and a first headrest gear 2302 which are installed in the headrest 23, at least one headrest rod rack 240 is arranged on the headrest rod 24, the headrest rod rack 240 is arranged along the length direction of the headrest rod 24, the first headrest gear 2302 is engaged with the headrest rod rack 240, the first headrest motor 2301 drives the first headrest gear 2302 to rotate and drives the headrest 23 to move up and down relative to the headrest rod 24 through the headrest rod rack 240.

[0076] In this structure, the headrest up-down driving part is arranged inside the headrest, which can reduce the occupation of the internal space of the backrest, and the internal space of the backrest can be more convenient for the layout of other components, such as the arrangement of the waist support adjusting mechanism, the waist massage mechanism, etc., so that the backrest can have more functions. When the height of the headrest relative to the backrest needs to be adjusted, the first headrest motor works to drive the first headrest gear to rotate, and since the first headrest gear is engaged with the headrest rod rack on the headrest rod, the headrest can be driven to move up and down relative to the backrest, thereby realizing the adjustment of the height of the headrest. Moreover, at least two headrest rods are arranged, in this way, the headrest can be limited to prevent the headrest from rotating relative to the backrest, and the headrest can be stably moved up and down relative to the backrest when the height of the headrest needs to be adjusted.

[0077] Preferably, in the embodiment, the headrest rod is made of metal, the bottom of the headrest rod is fixed to the backrest, and the headrest rod rack is a separate part which is detachably mounted on the headrest rod. The headrest rod rack can be made of plastic or metal. The headrest rod and the headrest rod rack are separately processed and assembled, which is convenient for production. Moreover, since the first headrest gear is engaged with the headrest rod rack when the first headrest gear rotates during the up-down adjustment of the headrest, the headrest rod rack can be damaged, which is convenient for maintenance and replacement and reduces the cost of maintenance and replacement. Moreover, in the embodiment, a headrest sliding groove matched with the headrest rod is arranged in the headrest, the headrest is slidingly connected with the headrest rod through the headrest sliding groove, which can ensure the stability and smoothness of the up-down movement of the headrest and prevent the occurrence of jamming problems.

[0078] Referring to Figures 6-9 As shown in the figure, the headrest rod 24 is two, the two headrest rods 24 are arranged at intervals, and the headrest rod rack 240 is arranged on each headrest rod 24; the headrest rod rack is arranged above the backrest and is not inserted into the backrest.

[0079] The first headrest gear 2302 is two, and each first headrest gear 2302 is engaged with a headrest rod rack 240;

[0080] A first headrest gear connecting rod 2303 is also provided, two ends of the first headrest gear connecting rod 2303 are connected with the two first headrest gears 2302 respectively, and the first headrest gear connecting rod 2303 is rotationally connected with the headrest 23, the first headrest motor 2301 drives the first headrest gear connecting rod 2303 to rotate, and simultaneously drives the two first headrest gears 2302 to rotate.

[0081] In the embodiment, the two headrest rods are provided with headrest rod racks, and two first headrest gears are adopted, when the first headrest motor drives the first headrest gear connecting rod to rotate, the two first headrest gears are simultaneously driven to rotate, so as to drive the headrest to move relative to the two headrest rods at the same time, and adjust the height of the headrest relative to the backrest. Moreover, the adoption of the two first headrest gears and the two headrest rod racks makes the two sides of the headrest be driven by the height adjustment during the height adjustment of the headrest, so that the headrest moves more stably up and down, prevents the headrest from sliding unstably and jamming due to the force on one side (if only one first headrest gear and one headrest rod rack are adopted), guarantees the smoothness and stability of the movement of the headrest, and reduces the problem of high maintenance rate caused by the easy wear on one side due to the force on one side.

[0082] Referring to Figures 6-10 As shown in the figure, the headrest 23 comprises a rear headrest part 231 and a front headrest part 232, the rear headrest part 231 is mounted on the headrest rod 24, the top rear side of the front headrest part 232 is rotationally connected with the top front side of the rear headrest part 231, and the headrest up-down driving part 230 is mounted in the rear headrest part 231.

[0083] The rear headrest part 231 is also provided with a headrest rotation driving part 233 for driving the front headrest part 232 to rotate around the rear headrest part 231.

[0084] In the embodiment, the headrest comprises a rear headrest part and a front headrest part, the front headrest part is used for supporting and abutting against the head and neck of the passenger, and is rotationally connected with the rear headrest part. When the headrest up-down driving part works, it drives the rear headrest part to move up and down relative to the headrest rod. Since the front headrest part is rotationally connected with the rear headrest part, when the rear headrest part moves up and down, the front headrest part moves up and down at the same time. When it is necessary to adjust the position and angle of the headrest, the headrest rotation driving part is used to drive the front headrest part to rotate around the rear headrest part, so as to adjust the distance between the front end bottom of the front headrest part and the rear headrest part, and further adjust the inclination angle and position of the front end face of the front headrest part, so as to support the head of the passenger at the most comfortable angle.

[0085] Referring to Figures 8-13As shown, the headrest rotating driving part comprises a second headrest motor 2331, a second headrest gear 2332 and a headrest pushing part 2333, the second headrest motor 2331 is installed in the rear side headrest part 231, the headrest pushing part 2333 is installed in the rear side headrest part 231 and moves longitudinally, and the headrest pushing part 2333 is provided with a longitudinal rack 2334 which engages with the second headrest gear 2332; the second headrest motor 2331 drives the second headrest gear 2332 to rotate and drives the headrest pushing part 2333 to move forward and backward.

[0086] The headrest 23 is provided with a gear 234, when the headrest pushing part 2333 moves forward and backward, the gear 234 drives the front side headrest part 232 to rotate around the rear side headrest part 231. (Of course, the gear can not be provided in the headrest, and another structure can be adopted, the headrest pushing part comprises a headrest pushing plate and two headrest connecting rods, the longitudinal rack is provided on the headrest pushing plate, the two headrest connecting rods are arranged left and right, the front end of the headrest connecting rod is rotationally connected with the front side headrest part, and the rear end of the headrest connecting rod is rotationally connected with the headrest pushing plate, so that when the headrest pushing plate moves forward and backward, the headrest connecting rod can push the bottom of the front side headrest part to move forward and backward, and the front side headrest part rotates relative to the rear side headrest part, wherein the headrest connecting rod is below the rotationally connected position of the front side headrest part and the rear side headrest part, so as not to affect the rotation of the front side headrest part relative to the rear side headrest part. In this structure, the headrest pushing part can be stopped at any position, and the front side headrest part can be rotated to any position to support the head of the passenger. In this embodiment, the gear is taken as an example).

[0087] In this structure, the headrest pushing part is arranged in front of the second headrest motor, the second headrest gear and the headrest up and down driving part, the longitudinal rack is two, the two longitudinal racks are arranged in interval, preferably left and right interval, the second headrest gear is two, each second headrest gear engages with one longitudinal rack, a second headrest gear connecting rod 2335 is further arranged, the two second headrest gears are connected with the two ends of the second headrest gear connecting rod respectively, the second headrest gear connecting rod is rotationally connected with the rear side headrest part, and the second headrest motor drives the second headrest gear connecting rod to rotate, thereby driving the two second headrest gears to rotate at the same time, and the headrest pushing part is driven to move forward and backward through the engagement of the second headrest gear and the longitudinal rack.

[0088] In this way, since the headrest pushing part is not directly connected with the front headrest part, the headrest pushing part and the front headrest part are connected by the gear to drive the rotation of the front headrest part, and the gear is arranged to enable the front headrest part to be stably held in the corresponding position after being pushed to the corresponding position, thereby ensuring the safety and comfort of use. In this embodiment, the gear 234 comprises a pushing piece 2340, two arc-shaped racks 2341, a tension spring 2342 and a reset piece 2343 (a tension spring can not be used), the reset piece is a reset spring or other structure with elastic reset force, the two arc-shaped racks are arranged at intervals on the left and right, the front ends of the arc-shaped racks are connected with the bottom rear side of the front headrest part, the rear end of the tension spring is hung with the rear headrest part, the front end is hung with the lower side of the front headrest part, and the tension spring always gives the rear pulling force to the bottom of the front headrest part. The rear end of the arc-shaped rack is movably arranged in the rear headrest part, the middle part of the pushing piece is rotatably connected with the front side below the headrest pushing part, the bottom of the pushing piece has two pushing teeth 2344 which can engage with the two arc-shaped racks respectively, the reset piece and the top of the pushing piece are located in front of the headrest pushing part, one end of the reset piece is connected with the top of the pushing piece, and the other end is connected with the front end of the headrest pushing part, the reset piece gives the pushing piece a forward pushing force, drives the pushing piece to rotate around the headrest pushing part, the top of the pushing piece is away from the front side of the headrest pushing part, and the pushing teeth are abutted on the lower front side wall of the headrest pushing part.

[0089] The bottom of the pushing tooth is an arc surface, and the top surface of the arc-shaped rack has a plurality of convex teeth 2345 arranged from front to back. The pushing tooth is between adjacent convex teeth of the arc-shaped rack. In the initial state, the pushing tooth is in front of the frontmost convex tooth. When the bottom of the front headrest part needs to be pushed away from the rear headrest part, the second headrest motor drives the headrest pushing part and the pushing piece to move backward through the second headrest gear and the longitudinal rack. In this process, the arc surface of the bottom of the pushing tooth is in contact with the convex tooth, and the convex tooth presses the pushing tooth. Due to the presence of the reset piece, the pushing piece rotates around the headrest pushing part (the bottom of the pushing piece rotates forward, and the top rotates backward), and the reset piece is compressed, and the pushing tooth can move backward to between the two adjacent convex teeth at the rear side. When the pushing tooth moves to between the two adjacent convex teeth at the rear side, the bottom of the pushing piece rotates backward and the top rotates forward due to the presence of the reset piece, and the pushing tooth enters between the two convex teeth and abuts against the rear side wall of the convex tooth at the front side. Then the pushing part moves forward, which drives the pushing piece to move forward, pushes the arc-shaped rack to move forward through the pushing tooth, and then drives the bottom of the front headrest part to rotate forward, so that the top of the front headrest part rotates around the rear headrest part by one tooth pitch (it can also be the length between 2 or 3 convex teeth or the length between more convex teeth: one tooth pitch is the length between two adjacent convex teeth). If more distance needs to be moved, after the arc-shaped rack moves forward by a distance driven by the headrest pushing part, the headrest pushing part continues to move backward by a predetermined distance. When the pushing piece moves backward, it has a certain downward pressure on the arc-shaped rack, and the downward pressure is greater than the tension of the tension spring, so that the arc-shaped rack does not move. Then, when the pushing tooth of the pushing piece enters behind the convex tooth at the rear side, the pushing tooth limits the movement of the arc-shaped rack backward. Then the headrest pushing part drives the pushing piece to move forward, drives the bottom of the front headrest part to move forward, and so on, until the best position or the required adjustment position is reached. The maximum rotation angle of the front headrest part is that the pushing tooth is clamped into the rear side of the last convex tooth. Of course, the headrest pushing part can directly drive the pushing tooth to move to the rear side of the last convex tooth when it moves backward, and then move forward by a predetermined distance according to the required adjustment position. The arc-shaped pushing tooth is coaxial with the rotating connection between the pushing piece and the headrest pushing part, so that the distance between the pushing tooth and the convex tooth to be contacted is equal when the pushing tooth is in contact with each convex tooth.

[0090] In this embodiment, a disengagement slope 2346 is arranged below and at the rear side of the pushing piece, which is arranged downwardly and rearwardly inclined, and when the front side headrest part needs to be reset, that is, the pushing teeth disengage from the gear pitch, the bottom of the front side headrest part is pulled rearward by the tension of the tension spring to move close to the rear side headrest part. The second headrest motor drives the headrest pushing part and the pushing piece to move rearward, so that the disengagement slope and the rear side headrest part are in contact, and continue to move a certain distance, and the rear side headrest part continues to press the disengagement slope (the rear side headrest part has a disengagement piece opposite to the disengagement slope, which presses the disengagement slope), and the pushing teeth at the bottom of the pushing piece are completely disengaged from the convex teeth of the arc-shaped gear rack upwardly. At this time, the pushing teeth will not give downward pressure to the arc-shaped gear rack, nor will it limit its rearward movement. Due to the existence of the tension spring, the recovery force of the tension spring will pull the front side headrest part to move rearward and reset. Of course, the tension spring can also not be arranged, and the passenger can push the front side headrest part to move rearward by the headrest force when the head is rested on the front side headrest part. In this structure, the existence of the gear positioner can stably stay at the position after the position of the front side headrest part is adjusted, which ensures the comfort and stability of use. In the utility model, the gear positioner can also adopt other existing and conventional gear positioners (for example, the gear positioner structure in the application numbers "202322213116.0, 202421950357.1" or similar structures), and the above-mentioned gear positioner structure can be not used, which can ensure that the front side headrest part is stably limited. The first structure can also be used without using the gear positioner.

[0091] Referring to Figure 7 As shown in the figure, the front side headrest part 232 includes a middle headrest 2320 and two side headrests 2321, the rear end top of the middle headrest 2320 is rotationally connected with the top front side of the rear side headrest part 231, the two side headrests 2321 are symmetrically arranged on both sides of the middle headrest 2320, and the inner ends of the two side headrests 2321 are rotationally connected with both sides of the middle headrest 2320 through damping parts; the headrest rotation driving part 233 drives the middle headrest 2320 to rotate around the rear side headrest part 231.

[0092] In the embodiment, the damping component preferably adopts a damping hinge, and the damping force is 30N-65N, preferably, the damping force of the outer end of the side headrest rotating forward is about 30N-35N, and the damping force of the side headrest rotating towards the rear headrest part is about 60N-65N, in this way, the damping force of the damping component rotating in two directions is different, when the outer end of the side headrest rotates towards the middle headrest part (when the outer end of the side headrest rotates away from the rear headrest part), the included angle between the two side headrests is reduced, which plays a wrapping role, so that the headrest can wrap the head, or wrap and support the neck of the passenger, and limit the position, so that the passenger is not easy to separate from the headrest when using, especially when sleeping, and the comfort is improved, therefore, when the side headrest rotates towards the middle headrest, the damping force is smaller, which is convenient for the user to rotate the side headrest and saves labor, and is more convenient. When the head or neck of the passenger is against the side headrest after being rotated, the supporting force is transmitted to the side headrest, the reverse damping force is larger, which can prevent the side headrest from suddenly rotating towards the rear headrest part, prevent the side headrest from being unfolded during use, and improve the comfort and safety of use.

[0093] The headrest also has a sound box, which can play music or other sounds, and has stronger functions.

[0094] In the embodiment, the front end of the arc-shaped rack and the front end of the tension spring are connected with the middle headrest, when the middle headrest is driven to rotate around the rear headrest part, the side headrest will rotate together with the rotation of the middle headrest (if the headrest connecting rod structure is adopted, the headrest connecting rod is connected with the middle headrest).

[0095] In the description of the utility model, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0096] In the utility model, unless another definite provision and limitation, the term " install", " link", " connect", " fixed" and so on term should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, for example, two through abutment, contact and so on form mechanical abutment or contact connection mode, two also can be directly hung or through the intermediate medium and hang up connection etc., also can be two element internal communication or two element's interaction relationship. For ordinary skilled person in the art, the specific meaning of the above-mentioned term in the application can be understood according to the specific circumstances.

Claims

1. An automotive seat back assembly, characterized by: The application relates to a chair back driving device. The chair back is rotatably installed at the bottom of a crossbeam; A backrest is arranged at the front side of the chair back, and the bottom of the backrest is rotatably connected with the bottom of the chair back or the crossbeam; A backrest driving part drives the backrest to rotate around the chair back or the crossbeam; The chair back driving part comprises a chair back motor and a first gear, the chair back motor is installed on the chair back, a first tooth plate is installed on the crossbeam, the first gear is engaged with the first tooth plate, the chair back motor drives the first gear to rotate and drives the chair back to rotate around the crossbeam.

2. The automotive seat back assembly of claim 1, wherein: The rotation connection part between the chair back and the crossbeam is coaxially arranged with the axis of the first tooth plate.

3. The automotive seat back assembly of claim 2, wherein: A first connecting gear is rotatably installed on the chair back, one side of the first connecting gear is engaged with the first gear, and the other side of the first connecting gear is engaged with the first tooth plate.

4. The automotive seat back assembly of claim 2, wherein: The backrest driving part comprises a backrest motor, a second gear and a second tooth plate, the second gear is engaged with the second tooth plate, and the backrest motor drives the second gear to rotate; 5. The automotive seat back assembly of claim 1, wherein: The second tooth plate is installed on the chair back, the backrest motor is installed on the backrest, and when the backrest motor drives the second gear to rotate, the bottom of the backrest is driven to rotate around the chair back or the crossbeam; Or, the second tooth plate is installed on the backrest, the backrest motor is installed on the chair back, and when the backrest motor drives the second gear to rotate, the bottom of the backrest is driven to rotate around the chair back or the crossbeam. A headrest is installed on the top of the backrest through at least two headrest rods, and the headrest can move up and down relative to the headrest rods.

6. The automotive seat back assembly of claim 1, wherein: A headrest up-and-down driving part is arranged in the headrest and drives the headrest to move up and down along the headrest rods, the headrest up-and-down driving part comprises a first headrest motor and a first headrest gear which are installed in the headrest, at least one headrest rod is provided with a headrest rod rack which is arranged along the length direction of the headrest rod, the first headrest gear is engaged with the headrest rod rack, and the first headrest motor drives the first headrest gear to rotate and drives the headrest to move up and down relative to the headrest rod through the headrest rod rack.

7. The automotive seat back assembly of claim 6, wherein: The headrest comprises a rear headrest part and a front headrest part, the rear headrest part is installed on the headrest rod, the top rear side of the front headrest part is rotatably connected with the top front side of the rear headrest part, and the headrest up-and-down driving part is installed in the rear headrest; 8. The automotive seat back assembly of claim 7, wherein: And / or, a headrest rotation driving part is arranged in the rear headrest part and drives the front headrest part to rotate around the rear headrest part. ​ 9. The automotive seat back assembly of claim 8, wherein: The front headrest part comprises a middle headrest and two side headrests, the rear end top of the middle headrest is rotationally connected with the top front side of the rear headrest part, the two side headrests are symmetrically arranged on the two sides of the middle headrest, and the inner end of each side headrest is rotationally connected with the side of the middle headrest through a damping part; the headrest rotation driving part drives the middle headrest to rotate around the rear headrest part.

10. The automotive seat back assembly of claim 1, wherein: The side wall of the chair back is provided with a locking limiting part, and the locking limiting part can limit the chair back on the automobile.

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