CN215552678U - Vehicle seat assembly - Google Patents

Abstract

The utility model provides a vehicle seat assembly, which comprises a slide rail arranged on a vehicle body, a cushion part arranged on the slide rail in a sliding way, and a backrest part arranged on the cushion part. Wherein, a locking mechanism is arranged between the seat cushion part and the slide rail. Meanwhile, the backrest part is rotatably arranged on the cushion part, and a limiting mechanism is arranged between the backrest part and the vehicle body and is provided with a connecting part for forming sliding contact between the backrest part and the vehicle body; when the cushion part is locked by the locking mechanism, the connecting part forms the limitation to the rotation of the backrest part; when the locking mechanism is unlocked and the cushion part slides, the connecting part can slide along with the backrest part relative to the vehicle body so as to enable the backrest part to rotate relative to the cushion part. The vehicle seat assembly can realize the posture and position adjustment of the seat, and has simple structure and convenient construction and implementation.

Description

Vehicle seat assembly

Technical Field

The utility model relates to the technical field of vehicle seats, in particular to a vehicle seat assembly.

Background

The automobile seat is a system engineering product integrating ergonomics, mechanical vibration, control engineering and the like, and the production and manufacturing of the automobile seat relate to processes of stamping, welding, injection molding, sewing, assembling, foaming and the like. Comfort, safety, environmental protection and intelligence of the seat are important performance considerations; the safe, intelligent, environment-friendly, comfortable and lightweight design of the seat gradually becomes the development trend of the future automobile seat.

The function of the automobile seat mainly comprises the following four aspects: providing support to the occupant, providing proper seating position and attitude, providing good ride comfort, providing good restraint to the occupant. The seat should be adaptable to passengers of different heights and weights to maintain the passenger in a stable position and comfortable posture for a long time.

Therefore, in some high-grade vehicle seats, an adjustment mechanism is provided to change the position and angular posture of the seat so as to provide a proper position for the head, arms, and legs of the occupant, prevent the occupant from moving forward, backward, left, and right unintentionally, and prevent the head of the occupant from being injured during a collision. In the event of an accident, the seat should be able to cooperate with a safety restraint system to prevent injury to the occupant during movement.

In order to improve the riding comfort of passengers, particularly passengers on the back-row seats, the back-row seats of each vehicle enterprise mostly adopt measures such as multi-color, suede fabric, aviation headrest, memory headrest, double-hardness foaming and the like, and the functions of ventilation, heating, massage and the like are added. In the vehicle types such as pickup and SUV, the improvement of the seat performance is mostly embodied in the aspects of adjusting color, fabric and foaming hardness, and the like, and the vehicle types such as saloon cars and MPV are mostly improved in the aspects of fabric, handrails, functional configuration and the like.

In addition to the improvements described above, the improvement in the comfort of the seat ride is even more important, in that it ensures the desired seating posture for the occupant, accommodating different persons, and at the same time requires proper support and positioning. If the comfortable sitting posture of the passenger is not satisfied, the passenger feels pain and fatigue after sitting for a long time, and customers complain about the pain and fatigue.

Particularly, the conventional rear seat of the vehicle basically has the function of only laying down the backrest, but the sitting posture and the sitting position cannot be changed, and if a plurality of motors and corresponding transmission structures are required to be arranged according to the adjustment mode of the driving seat, the cost is too high, and the rear seat is difficult to be widely adopted. Therefore, it is necessary to develop a seat structure that can achieve posture and position adjustment and is easy to construct and implement.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to a vehicle seat assembly to provide a seat structure that can achieve posture and position adjustment and is easy to construct and implement.

In order to achieve the purpose, the technical scheme of the utility model is realized as follows:

a vehicle seat assembly comprises a slide rail arranged on a vehicle body, a seat cushion part arranged on the slide rail in a sliding way, and a backrest part arranged on the seat cushion part, wherein a locking mechanism is arranged between the seat cushion part and the slide rail; wherein:

the backrest part is rotatably arranged on the cushion part, a limiting mechanism is arranged between the backrest part and the vehicle body, and the limiting mechanism is provided with a connecting part for forming sliding contact between the backrest part and the vehicle body;

when the cushion part is locked by the locking mechanism, the connecting part limits the rotation of the backrest part; when the locking mechanism is unlocked and the cushion part slides, the connecting part can slide along with the backrest part relative to the vehicle body, so that the backrest part rotates relative to the cushion part.

Further, the restraining mechanism is configured to be operable to release the restraint of the backrest portion; the backrest portion can be turned upside down with respect to the cushion portion by releasing the restriction.

Furthermore, the limiting mechanism comprises a backrest lock arranged on the backrest part and a lock rod arranged on the vehicle body, and a slide way is arranged on the vehicle body; the lock rod is locked in a lock opening of the backrest lock and is slidably arranged in the slide way in a penetrating way; the connecting portion is constituted by the lock lever.

Furthermore, a locking frame is arranged on the vehicle body; the slide is arranged on the locking frame.

Further, the slide way is obliquely arranged on the locking frame.

Furthermore, the slide rail comprises a lower rail fixedly arranged on the vehicle body and an upper rail slidably arranged in the lower rail; the locking mechanism comprises a locking part arranged between the lower rail and the upper rail and an operating part arranged on the seat cushion part; the operating part is in transmission connection with the locking part, the locking part can form locking between the lower rail and the upper rail in a natural state, and the operating part is operated to drive the locking part to act so as to release locking of the locking part.

Further, the seat cushion part comprises a base and a seat cushion framework hinged on the base; the base is fixedly connected with the upper rail, and the backrest part is hinged to the base.

Further, the operating part comprises an unlocking plate which is rotatably arranged on the seat cushion framework; the locking part comprises a locking pin arranged in the upper rail in a sliding mode, a locking groove arranged on the lower rail and a first elastic piece located between the locking pin and the upper rail; the unlocking plate is provided with a driving surface, and the driving surface is connected with one end of the locking pin in an abutting mode.

Furthermore, the unlocking plate is connected with a pull wire structure arranged on the seat cushion framework, and a second elastic part is arranged between the unlocking plate and the seat cushion framework; the pull wire structure is used for bearing external force to drive the unlocking plate to rotate; the second elastic piece is used for driving the rotating unlocking plate to return.

Furthermore, the bottom of the seat cushion framework is provided with a soft cushion block.

Compared with the prior art, the utility model has the following advantages:

the vehicle seat assembly adopts the cushion part which can be locked on the slide rail and can also be unlocked to slide back and forth to drive the backrest part to move, the change of the inclination angle of the backrest part under the state that the cushion part is locked is limited by the limiting mechanism between the vehicle body and the backrest part, and meanwhile, the limiting mechanism and the backrest part are connected in a sliding abutting mode, so that the backrest part can be allowed to move along with the sliding of the cushion part and the inclined angle can be changed, and the posture and the position of the seat can be adjusted by the seat structure which is simple and convenient to construct and implement.

Meanwhile, the limiting mechanism is configured to be capable of limiting the backrest part in an operating contact mode, the backrest part can be completely released, and the backrest part is laid on the cushion part, so that the space of the vehicle trunk is enlarged. The backrest lock and the lock rod capable of sliding and shifting are adopted, so that the hinged connection between the vehicle body and the backrest part can be realized, the synchronous change of the position and the inclination angle of the backrest part is allowed, and the locking of the contact backrest lock is convenient to operate, so that the backrest part is completely released.

In addition, the seat is provided with the base, so that the seat can be conveniently installed and assembled on the slide rail; the seat cushion frameworks of the backrest part and the seat cushion part are hinged and arranged on the base, so that not only can the function of laying down the backrest part be realized, but also the seat cushion frameworks can be folded up and closed with the backrest part, and the seat cushion of the seat can be upwards overturned and folded up to increase the space between the front row of seats and the rear row of seats.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model, illustrate embodiments of the utility model and together with the description serve to explain the utility model, and the description is given by way of example only and without limitation to the terms of relative positions. In the drawings:

FIG. 1 is a schematic view of the overall structure of a vehicle seat assembly according to an embodiment of the present invention;

FIG. 2 is an exploded view of a vehicle seat assembly according to an embodiment of the present invention;

FIG. 3 is a schematic perspective view of a backrest and a limiting mechanism according to an embodiment of the present invention;

FIG. 4 is an exploded view of a spacing mechanism according to an embodiment of the present invention;

FIG. 5 is a schematic view of an assembly structure of the base, the slide rail and the vehicle body mounting base according to the embodiment of the utility model;

FIG. 6 is a schematic perspective view of a seat cushion and a locking mechanism according to an embodiment of the utility model;

FIG. 7 is a schematic structural diagram of an operating portion of the locking mechanism according to the embodiment of the present invention;

fig. 8 is a schematic view of an installation structure of the operation part according to the embodiment of the present invention;

FIG. 9 is a schematic illustration of the assembled relationship of the latch bolt, headrail and unlatching plate in accordance with an embodiment of the present invention;

description of reference numerals:

1. a slide rail; 10. a lower rail; 11. rail mounting;

2. a pivot post; 200. a fastener;

3. a seat cushion portion; 30. a base; 300. a first pivot hole; 301. a second pivot hole; 31. a seat cushion framework; 310. a seat cushion connecting frame; 311. a seat cushion steel wire;

40. a pull wire; 400. a stay wire fixing frame; 401. pulling the belt; 402. an unlocking seat; 403. an unlocking plate; 404. a drive face; 405. a rotation pin; 406. a soft cushion block; 407. a spacing pin; 408. a second elastic member; 409. a locking pin;

5. a backrest part; 50. a backrest frame; 500. a backrest connecting frame; 501. a backrest wire; 502. a backrest standpipe;

60. a backrest lock; 600. locking the opening; 601. a rubber pad; 602. unlocking the pull belt; 603. a lock frame; 61. a lock lever; 610. a locking frame; 611. a slideway;

7. a vehicle body floor; 8. and (4) rear side metal plates.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc. appear, they are based on the orientation or positional relationship shown in the drawings and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the appearances of the terms first, second, etc. in the figures are also for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in conjunction with specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The embodiment relates to a vehicle seat assembly, which is arranged on a vehicle body in a vehicle, can realize the posture and position adjustment of a seat, and has a simple structure and is convenient to construct and implement.

The vehicle seat assembly comprises a slide rail arranged on a vehicle body, a cushion part arranged on the slide rail in a sliding way, and a backrest part positioned on the cushion part. Wherein, a locking mechanism is arranged between the seat cushion part and the slide rail. The backrest part is rotatably arranged on the cushion part, and a limit mechanism is arranged between the backrest part and the vehicle body. The limiting mechanism is provided with a connecting part which forms sliding and abutting between the backrest part and the vehicle body; when the cushion part is locked by the locking mechanism, the connecting part forms the limitation to the rotation of the backrest part; when the locking mechanism is unlocked and the cushion part slides, the connecting part can slide along with the backrest part relative to the vehicle body, so that the backrest part rotates relative to the cushion part.

Based on the above design concept, an exemplary structure of the vehicle seat assembly of the present embodiment is shown in fig. 1.

The vehicle seat assembly of the present invention is of course suitable for use with individual seats on a vehicle, and is particularly suitable for use with rear seats of a vehicle. The present embodiment will be described by taking a rear seat of a vehicle as an example.

As shown in fig. 1 and 2, the vehicle seat assembly is mounted on a vehicle body, where the vehicle body provides a mounting base including a vehicle body floor 7 and a rear-side sheet metal 8. Wherein, the slide rail 1 is arranged on the vehicle body floor 7 along the length direction of the vehicle, and preferably two sets of slide rails 1 are arranged in bilateral symmetry to improve the support stability of the seat.

The stopper mechanism has a connecting portion which makes the backrest portion 5 and the rear-side metal plate 8 slidably abut against each other, and the connecting portion can restrict the rotation of the backrest portion 5 and can slide with the backrest portion 5 relative to the vehicle body. Therefore, when the cushion part 3 slides back and forth, the position of the backrest part 5 can be changed, and due to the limitation of the limiting mechanism on the backrest part 5, the backrest part 5 can synchronously change the inclination angle while changing the position. Just by the design, the linkage of the cushion part 3 and the backrest part 5 is realized by a simple and efficient structure, and the inclination angle of the seat is adjusted while the front and rear positions of the seat are changed.

As shown in fig. 3 and 4, it is preferable that the restricting mechanism be configured in an operable form to release the restriction of the backrest portion 5 by operating the restricting mechanism, so that the backrest portion 5 can be turned upside down with respect to the cushion portion 3 by the release of the restriction. Specifically, the limit mechanism includes a backrest lock 60 provided on the backrest portion 5, and a lock lever 61 provided on the vehicle body; the vehicle body is provided with a slide rail 611, and the lock lever 61 is locked in the lock opening 600 of the seatback lock 60 and is also slidably inserted in the slide rail 611. The above-mentioned connecting portion is constituted by the lock lever 61. In order to prevent noise caused by collision between the lock lever 61 and the lock notch 600, a rubber pad 601 made of rubber or the like may be lined in the lock notch 600.

The limiting mechanism is configured to be in a mode of limiting the backrest part 5 in an operating contact mode, the backrest part 5 can be completely released, and the backrest part 5 is laid on the cushion part 3, so that the space of the vehicle trunk is enlarged; with the backrest lock 60 and the slidably displaceable lock lever 61, not only is it possible to achieve a hinged connection between the vehicle body and the backrest part 5, allowing a synchronous change in the position and inclination of the backrest part 5, but it is also easy to operate the locking of the contact backrest lock 60, so that the backrest part 5 is released completely.

Wherein, the vehicle body is provided with a locking frame 610; the slide rail 611 is arranged on the locking frame 610; preferably, the slide 611 is arranged in an obliquely downward direction. By fixing the lock bracket 610 to the vehicle body, the arrangement of the slide rail 611 and the mounting arrangement of the lock lever 61 are facilitated. The slide rail 611 is arranged in a downward inclined direction, for example, the slide rail 611 is arranged in a direction inclined from the rear upper side of the vehicle to the front lower side of the vehicle, so that the requirement that the cushion part 3 drives the backrest part 5 to synchronously change the position and the inclination angle of the backrest is met, and the linkage effect of the cushion part 3 and the backrest part 5 can be improved.

As shown in fig. 3, a lock bracket 603 is fixed to the back frame 50 of the backrest 5, and the back lock 60 is attached to the lock bracket 603 by a fastener 200. The fastener 200 here may be an M6 bolt. During use, the backrest lock 60 may be unlocked by pulling the unlocking pull tab 602 of the backrest lock 60 to unlock the lock lever 61. When the lock lever 61 is restricted in the locking notch 600, the lock lever 61 can synchronously slide in the slide rail 611 with the sliding of the cushion part 3, so that the inclination angle of the backrest part 5 is changed. Thus, the inclination angle of the backrest is increased when the seat moves forwards; conversely, the seat moves backward, and the backrest inclination angle becomes smaller.

In addition, in order to facilitate the construction of the backrest part 5, the backrest part 5 of the present embodiment includes a frame-like backrest frame 50, a backrest connecting frame 500 for hingedly connecting with the cushion part 3, and a backrest vertical tube 502 and a backrest wire 501.

The backrest connecting frames 500 are two symmetrically arranged, and are formed by a stamping process, and are hinged to the two bases 30 of the cushion part 3 through two pivot posts 2, and the pivot posts 2 can use M10 bolts. The lower transverse tube and the vertical backrest tube 502 in the backrest framework 50 can be realized by a punching process, and preferably, the lower transverse tube and the vertical backrest tube are made of Q345 material, have the diameter phi of 19 and the wall thickness of 2 mm. The main body of the backrest frame 50, i.e. the upper bent pipe, can be realized by a bending process, and preferably adopts a pipe material made of Q345 material, with the diameter phi of 25 mm and the wall thickness of 2 mm. The above parts can be fixedly connected into a whole by adopting a welding mode. Meanwhile, a plurality of backrest steel wires 501 can be erected on the backrest framework 50, the backrest steel wires 501 can be made of Q195 materials and have the diameter phi 5, the backrest steel wires 501 are formed by bending, and each backrest steel wire 501 is welded on the backrest framework 50 and forms a support for the backrest together with the backrest framework 50.

As shown in fig. 5 and 6, in order to facilitate the construction of the cushion part 3, in the present embodiment, the cushion part 3 includes a base 30, and a cushion frame 31 hinged on the base 30, and specifically, the cushion frame 31 is hinged in the second pivot hole 301 of the base 30. Wherein the base 30 is fixedly connected with the upper rail 11, and the backrest portion 5 is hinged in the first pivot hole 300 of the base 30. A base 30 is arranged for the seat, so that the seat can be conveniently installed and assembled on the slide rail 1; the seat cushion frames 31 of the backrest part 5 and the cushion part 3 are hinged on the base 30, so that not only the function of laying down the backrest part 5 can be realized, but also the seat cushion frames 31 can be folded to be close to the backrest part 5, and the seat cushion of the seat can be upwards overturned and folded to increase the space between the front row seat and the rear row seat.

Referring to the construction process and the used section bars of the components in the backrest part 5, in the cushion part 3, the cushion frame 31 is a tube plate combination and is formed by welding to ensure the strength of the cushion, bear the load of passengers and support, the cushion frame 31 is firstly welded to the cushion connecting frame 310, the cushion connecting frame 310 is hinged on the base 30 through the pivot column 2, here, the pivot column 2 can also adopt M10 bolt to realize the turnover of the seat cushion.

The seat cushion connecting frame 310 is formed by stamping, the unlocking seat 402 for fixedly mounting the operation part can also adopt a stamping process, and the edge of the unlocking seat is turned over to limit the spring.

In addition, a soft cushion block 406 is disposed at the bottom of the seat cushion frame 31, and the soft cushion block 406 can be fastened to the seat cushion frame 31 by a fastener 200. When the seat cushion frame 31 is put down and reaches a sitting angle, the bottom of the seat cushion frame 31 needs to be supported by the vehicle body floor 7 or the slide rail 1, and the soft cushion block 406 is additionally arranged at the bottom of the seat cushion frame 31, so that a buffering effect can be realized in the process of putting down the seat cushion frame 31. Meanwhile, a clamping structure can be additionally arranged between the seat cushion framework 31 and the base 30 or between the seat cushion framework 31 and the sliding rail 1, so that the seat cushion of the seat can be automatically kept at the sitting angle position. The soft cushion block 406 is preferably made of rubber, and plays a role of supporting the seat cushion, and has an abnormal sound prevention effect.

The main body of the seat cushion framework 31 is realized by a bending process, and preferably adopts a Q345 material, a pipe with the diameter phi of 25 and the wall thickness of 2 mm. The rear cross tube in the seat cushion frame 31 is preferably a tube of Q345 diameter phi 19 and wall thickness 2 mm. Meanwhile, a seat cushion steel wire 311 is laid on the seat cushion frame 31, the seat cushion steel wire 311 is made of Q195 material and has a diameter phi 5, and the forming is realized through bending. The components are fixedly connected into a whole by welding, are used for supporting a human body and realize the safety and submergence prevention function.

As for the assembling portion of the seat cushion portion 3 and the slide rail 1, as shown in fig. 5 and fig. 6 in combination with fig. 2, the slide rail 1 includes a lower rail 10 fixedly mounted on the vehicle body floor 7 of the vehicle body, and an upper rail 11 slidably disposed in the lower rail 10, and the seat cushion portion 3 is fixedly mounted on the upper rail 11.

The locking mechanism includes a locking portion provided between the lower rail 10 and the upper rail 11, and an operating portion provided on the cushion portion 3. The operating part is in transmission connection with the locking part, the locking part can form locking between the lower rail 10 and the upper rail 11 in a natural state, and the operating part can be operated to drive the locking part to act so as to release the locking of the locking part. The lower rail 10 and the upper rail 11 which are sleeved inside and outside are adopted, so that the sliding effect of the sliding rail 1 can be improved; and set up locking part between lower rail 10 and upper rail 11, have the advantage that technical process is mature, be convenient for purchase the current slide rail product that is suitable for.

Specifically, as shown in fig. 7, 8 and 9, the operation portion includes an unlocking plate 403 rotatably provided on the seat cushion frame 31; the locking part comprises a locking pin 409 which is arranged in the upper rail 11 in a sliding way, a locking groove which is arranged on the lower rail 10, and a first elastic piece which is arranged between the locking pin 409 and the upper rail 11; the unlocking plate 403 has a driving surface 404, and the driving surface 404 is in abutting connection with one end of the locking pin 409.

The locking part adopts a form of a locking pin 409, is matched with an unlocking plate 403 arranged on the seat cushion part 3, and realizes the action of the locking pin 409 through the pressing of the unlocking plate 403 on the locking pin 409, so that the upper rail 11 on the lower rail 10 can be unlocked; this arrangement is not only simple and efficient, but also suitable for the case where the cushion part 3 needs to be turned over. For example, a plurality of clamping grooves arranged at intervals may be formed in the lower rail 10, the locking pin 409 is pressed in the clamping grooves by a spring, and the locking pin 409 is inserted into a through hole in the upper rail 11, so as to lock the lower rail 10 and the upper rail 11; when the driving surface 404 inclined on the unlocking plate 403 presses the locking pin 409 along with the rotation of the unlocking plate 403, the locking pin 409 can be driven to disengage from the slot on the lower rail 10, so as to unlock the lock.

The operating portion described above preferably takes a form similar to a brake cable. Specifically, the unlocking plate 403 is connected to a wire structure provided on the seat cushion frame 31, and a second elastic member 408 is provided between the unlocking plate 403 and the seat cushion frame 31, and a torsion spring is preferably used as the second elastic member 408. The unlocking plate 403 rotates on the rotating pin 405 fixed on the unlocking seat 402, the torsion spring is sleeved on the rotating pin 405, one end of the torsion spring presses against the flange of the unlocking seat 402, and the other end presses against the limiting pin 407 fixed on the unlocking plate 403 to drive the unlocking plate 403 to return. The pulling wire 40 is connected between the unlocking plate 403 and the pulling belt 401, and a pulling wire fixing frame 400 is fixedly installed on the seat cushion frame 31 to fix the pulling wire 40. Thus, the locking mechanism receives external force to drive the unlocking plate 403 to rotate, and can drive the cushion part 3 to move forwards while unlocking the cushion part 3; when the pull tape 401 is released, the second elastic member 408 drives the rotating unlocking plate 403 to return.

Adopt the structure of acting as go-between, the cooperation is located the stretching strap 401 of 40 one ends of acting as go-between, can conveniently pull the operation to order about unlocking plate 403 swing, when the setting of second elastic component 408 was then convenient for release stretching strap 401, unlocking plate 403 can return to the throne by oneself, thereby makes locking round pin 409 rely on first elastic component to upwards stretch out, in order to get into the locking state.

The unlocking seat 402 and the unlocking plate 403 are formed by stamping, the limiting pin 407 is a turned part and fixed on the unlocking plate 403 by welding, and the rotating pin 405 can be installed by riveting.

The vehicle seat assembly described in this embodiment, adopt can lock on the slide rail 1, also can unblock and the back and forth gliding cushion portion 3 drives the action of back portion 5 simultaneously, limit mechanism between automobile body and back portion 5 limits the change of inclination of cushion portion 3 under the locked state, simultaneously, the slip butt between limit mechanism and the back portion 5 links to each other the setting, can allow back portion 5 to remove and change the angle of slope along with the slip of cushion portion 3 thereupon, thereby realized the gesture and the position adjustment of seat with a seat structure that is comparatively succinct, convenient to construct the implementation.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A vehicle seat assembly comprises a slide rail (1) arranged on a vehicle body, a seat cushion part (3) arranged on the slide rail (1) in a sliding way, and a backrest part (5) positioned on the seat cushion part (3), wherein a locking mechanism is arranged between the seat cushion part (3) and the slide rail (1); the method is characterized in that:

the backrest part (5) is rotatably arranged on the cushion part (3), a limiting mechanism is arranged between the backrest part (5) and the vehicle body, and the limiting mechanism is provided with a connecting part which forms sliding contact between the backrest part (5) and the vehicle body;

when the cushion part (3) is locked by the locking mechanism, the connecting part is used for limiting the rotation of the backrest part (5);

when the locking mechanism is unlocked and the cushion part (3) slides, the connecting part can slide along with the backrest part (5) relative to the vehicle body, so that the backrest part (5) rotates relative to the cushion part (3).

2. The vehicle seat assembly of claim 1, wherein:

the restraining mechanism is configured to be operable to release the restraint of the backrest part (5);

the backrest part (5) can be turned over and laid down relative to the cushion part (3) by releasing the restriction.

3. The vehicle seat assembly of claim 2, wherein:

the limiting mechanism comprises a backrest lock (60) arranged on the backrest part (5) and a lock rod (61) arranged on the vehicle body, and a slide way (611) is arranged on the vehicle body;

the lock rod (61) is locked in a lock opening (600) of the backrest lock (60) and is slidably arranged in the slide way (611);

the connecting part is formed by the lock rod (61).

4. The vehicle seat assembly of claim 3, wherein:

a locking frame (610) is arranged on the vehicle body;

the slide way (611) is arranged on the locking frame (610).

5. The vehicle seat assembly of claim 4, wherein:

the slide rail (611) is obliquely arranged on the locking frame (610).

6. The vehicle seat assembly of any of claims 1-5, wherein:

the sliding rail (1) comprises a lower rail (10) fixedly arranged on the vehicle body and an upper rail (11) slidably arranged in the lower rail (10);

the locking mechanism comprises a locking part arranged between the lower rail (10) and the upper rail (11) and an operating part arranged on the seat cushion part (3);

the operating part is in transmission connection with the locking part, the locking part can form locking between the lower rail (10) and the upper rail (11) in a natural state, and the operating part can be operated to drive the locking part to act so as to release the locking of the locking part.

7. The vehicle seat assembly of claim 6, wherein:

the seat cushion part (3) comprises a base (30) and a seat cushion framework (31) hinged to the base (30);

the base (30) is fixedly connected with the upper rail (11), and the backrest part (5) is hinged to the base (30).

8. The vehicle seat assembly of claim 7, wherein:

the operating part comprises an unlocking plate (403) which is rotatably arranged on the seat cushion framework (31);

the locking part comprises a locking pin (409) which is arranged in the upper rail (11) in a sliding mode, a locking groove which is arranged on the lower rail (10), and a first elastic piece which is positioned between the locking pin (409) and the upper rail (11);

the unlocking plate (403) is provided with a driving surface (404), and the driving surface (404) is connected with one end of the locking pin (409) in an abutting mode.

9. The vehicle seat assembly of claim 8, wherein:

the unlocking plate (403) is connected with a stay wire structure arranged on the seat cushion framework (31), and a second elastic piece (408) is arranged between the unlocking plate (403) and the seat cushion framework (31);

the pull line structure is used for bearing external force to drive the unlocking plate (403) to rotate;

the second elastic piece (408) is used for driving the rotating unlocking plate (403) to return.

10. The vehicle seat assembly of claim 6, wherein:

the bottom of the seat cushion framework (31) is provided with a soft cushion block (406).

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