CN117183854A - Automobile seat device with follow-up armrests - Google Patents

Abstract

An automobile seat device with a follow-up armrest belongs to the technical field of automobile seat accessories. Comprises a seat back assembly, a seat back assembly and a seat back assembly, wherein the seat back assembly is provided with a pair of side sheet metal brackets; a pair of angle adjuster connecting brackets; an adjuster unit for effecting angular adjustment of the seat back assembly; the armrest body is arranged at one side position of the seat backrest assembly; the output end of the handrail driving motor module is in transmission connection with a power output shaft; the transmission disc is in transmission connection with the power output shaft, a transmission disc matching boss is convexly arranged on the transmission disc, a lateral sheet metal bracket matching hole is formed in the body of the lateral sheet metal bracket, and the transmission disc matching boss is matched and installed in the lateral sheet metal bracket matching hole and can rotate in the lateral sheet metal bracket matching hole; the transmission locking unit is arranged between the transmission disc and the handrail body and is in transmission connection with the transmission disc and the handrail body. The advantages are that: the armrest body rotates along with the seat backrest assembly and is adjusted adaptively, so that the armrest body accords with the characteristics of human engineering, has a compact and simple structure, and improves riding comfort.

Description

Automobile seat device with follow-up armrests

Technical Field

The application belongs to the technical field of automobile seat accessories, and particularly relates to an automobile seat device with a follow-up handrail.

Background

Automobile seats are one of important safety components of automobiles, the riding experience of drivers and passengers is directly influenced by the comfort level of the automobile seats, and besides the comfort level of the automobile seats is influenced by the softness of the automobile seats, the posture of the automobile seats is an important factor for measuring the riding comfort level. With the increasing demands on seat function and comfort, higher demands are also being placed on seat function and comfort. The armrests are also important factors for improving the comfort of the seat, particularly under the condition of long journey, the passengers can place the arms or elbows on the armrests, and the comfort of the hands, the shoulders, the neck and the back is improved while the passengers are convenient to sit. The passenger can adjust the position of handrail according to actual demand, and the passenger also can be through upwards overturn the handrail to increase the space of seat side and make things convenient for the passenger to get in and out. The seat armrests are generally arranged on the seat back frame, one ends of the armrests are connected to the middle of the side face of the back frame, the other ends of the armrests can rotate around the rotating shafts at the connecting positions, and the rotating shafts adopt damping rotating shafts, so that the armrests can be rotated upwards to stop at one side of the seat back or can be rotated to the back to prevent the armrests from rotating, the existing vehicle seat armrests are convenient to adjust, and soft and comfortable supports can be promoted for hands of passengers.

However, with the continuous improvement of the living standard of people and the continuous development of the new energy vehicle industry, the development of the intellectualization and multifunctionalization of vehicles and internal seats has become more important in the development of the current main engine factories, so as to improve the comfort, to meet the requirement of passengers for achieving the most comfortable posture during riding, seats capable of performing large-angle adjustment and zero-gravity seats are more and more favored by manufacturers and passengers, and then the use requirement of the seats capable of performing large-angle adjustment cannot be met by the conventional armrest structure adjustment, and certain limitation is caused on the comfort of use; specifically, when the seat capable of realizing large-angle adjustment is subjected to posture adjustment and change, the human body posture of a driver and a passenger can be correspondingly changed along with the rotation of the seat, the back and arm positions can be naturally changed, then the posture of the existing seat armrest mechanism is limited in change and can not be correspondingly changed along with the rotation of a seat backrest, and the armrest mechanism is still only suitable for the body state of the trunk in the vertical position after the seat is changed, so that the arm part of the human body is out of support, the hand cannot borrow force, and meanwhile, the posture of the driver and the passenger is quite twisted, so that the riding comfort of the driver and the passenger is greatly reduced; numerous attempts have been made by existing host factories and automobile spare and accessory parts manufacturers to solve this problem, so as to achieve the following of the armrests and the seat backs, but the following armrests of the existing vehicle seats generally have the problems of excessively complex structure, more integral parts and troublesome installation and disassembly.

In view of the above, it is necessary to design a seat device capable of realizing the follow-up of the armrest when the seat is subjected to the posture change. To this end, the inventors have advantageously devised that the technical solutions described below are created in this context.

Disclosure of Invention

The application aims to provide a simple, reliable and durable automobile seat device with a follow-up armrest, which is beneficial to optimizing an internal structure and additionally arranging a transmission disc so as to realize the follow-up of the armrest and a seat back, ensure the linkage of the angle of the seat back and the change of the posture of the armrest and improve the riding comfort.

The object of the application is achieved by a vehicle seat arrangement with a follower arm, comprising a seat back assembly with a pair of side sheet metal brackets connected together; the two regulator connecting brackets are respectively arranged at the bottom positions of the side sheet metal brackets on the left side and the right side; the regulator unit is used for realizing the angle adjustment of the seat back assembly and is arranged between the two regulator connecting brackets; is characterized by further comprising: an armrest body disposed at a side of the seat back assembly; the handrail driving motor module is arranged at the inner side position close to the side sheet metal bracket of the handrail body, and the output end of the handrail driving motor module is also in transmission connection with a power output shaft which outwards penetrates out of the side sheet metal bracket; the driving disc is arranged at the outer side position of the side sheet metal bracket, which corresponds to the handrail driving motor module, the power output shaft penetrates the driving disc and is in driving connection with the driving disc, a driving disc matching boss is convexly arranged on the surface of one side of the driving disc, which faces the side sheet metal bracket, and a side sheet metal bracket matching hole is formed in the body of the side sheet metal bracket, and the driving disc matching boss is matched and installed in the side sheet metal bracket matching hole and can rotate in the side sheet metal bracket matching hole; the transmission locking unit is arranged between the transmission disc and the handrail body and is in transmission connection with the transmission disc and the handrail body, and the transmission locking unit can drive the handrail body to rotate under the drive of the transmission disc and can realize the locking of the driving handrail body.

In a specific embodiment of the application, an external spline is arranged on the shaft body of the power output shaft, an internal spline hole is arranged in the transmission disc, the shape of the internal spline hole is matched with that of the external spline, and the external spline can be matched and installed in the internal spline hole, so that the power output shaft and the transmission disc can be installed in a matched mode.

In another embodiment of the present application, the transmission locking unit includes an inner housing, an outer housing, a connecting locking assembly and a handrail drive shaft; the inner cover shell is close to the transmission disc, the inner cover shell is fixedly connected with the transmission disc body, and the transmission disc can drive the inner cover shell to rotate; the outer cover shell is arranged at a position close to the handrail body, the connecting locking assembly is connected between the inner cover shell and the outer cover shell, the handrail driving shaft penetrates through the connecting locking assembly and the outer cover shell, the handrail driving shaft is in transmission connection with the connecting locking assembly, and the handrail driving shaft also penetrates into the handrail body and can drive the handrail body to rotate.

In a further specific embodiment of the present application, a plurality of driving disc connection blocks are convexly arranged on the surface of one side of the driving disc, which is far away from the side sheet metal bracket, and a plurality of inner cover shell connection holes are formed on the inner cover shell of the driving locking unit and at positions corresponding to the plurality of driving disc connection blocks, and the plurality of driving disc connection blocks can be matched and installed into the corresponding inner cover shell connection holes, so that the matched connection of the driving disc body and the inner cover shell body is realized.

In still another specific embodiment of the present application, a handrail frame is further disposed in the handrail body, the handrail frame is in a strip shape, a handrail frame connecting block is cooperatively installed at an end portion, close to the transmission locking unit, of the handrail frame in the length direction, a transmission member is further sleeved at an end portion, close to the transmission locking unit, of the handrail driving shaft in the length direction, the handrail driving shaft can drive the transmission member to rotate, and the transmission member passes through the handrail frame body and is cooperatively installed with the handrail frame connecting block, so that transmission connection between the handrail driving shaft and the transmission member is achieved, and driving of the handrail driving shaft to the handrail body is achieved.

In still another specific embodiment of the present application, the driving member includes a driving member sleeve and a driving member mounting plate, the driving member sleeve is mounted on an end of the handrail driving shaft body in a matching manner, and the driving member mounting plate is formed on a side of the driving member sleeve away from the handrail driving shaft body, and a handrail frame connecting plate fitting hole is formed on the handrail frame connecting block at a position corresponding to the driving member mounting plate, the shape of the handrail frame connecting plate fitting hole is adapted to the shape of the driving member mounting plate, and the driving member mounting plate is mounted in the handrail frame connecting plate fitting hole in a matching manner, thereby realizing connection between the driving member and the handrail frame.

In a further particular embodiment of the application, a pair of handrail drive shaft mating wedge surfaces are formed on an end of the handrail drive shaft body adjacent to the transmission member, and a transmission member sleeve wedge block is formed within the transmission member sleeve and at a position corresponding to both handrail drive shaft mating wedge surfaces, both handrail drive shaft mating wedge surfaces being respectively mated against the respective corresponding transmission member sleeve wedge blocks, thereby effecting a transmission connection between the handrail drive shaft and the transmission member.

In a further specific embodiment of the present application, the recliner unit includes a back drive motor module, a pair of recliner bodies, a synchronizing bar and a stop-limiting bracket; the backrest driving motor module is arranged on the inner side of the side sheet metal bracket opposite to the handrail driving motor module, one ends of the two angle adjuster bodies are respectively arranged at the top end parts of the two angle adjuster connecting brackets, the other ends of the two angle adjuster bodies are respectively fixedly arranged at the bottom end parts of the two side sheet metal brackets, the two end parts of the synchronizing rod in the length direction respectively penetrate through the two angle adjuster bodies, the synchronizing rod also penetrates through the output end of the backrest driving motor module, and the backrest driving motor module realizes driving operation on the two angle adjuster bodies through the synchronizing rod; the limit stop point support is fixedly arranged at the outer side part of the end part of the near bottom end of the side sheet metal support, which is opposite to the handrail driving motor module, and is arranged at the lower position corresponding to the backrest driving motor module, and can be abutted to the angle adjuster connecting support and limit the rotation angle of the backrest assembly.

In still another specific embodiment of the present application, an annular stop limit groove is formed at the top end of the recliner connecting bracket, and a stop limit bracket stop portion is formed by bending the lower portion of the stop limit bracket, and the stop limit bracket stop portion is cooperatively disposed in the stop limit groove and can be respectively abutted to the end positions of the front end and the rear end of the stop limit groove, thereby realizing the limitation of the rotation angle of the side sheet metal bracket, i.e., the seat back assembly.

In yet another specific embodiment of the present application, the seat back assembly further includes a back bottom bracket, a back middle bracket, and a back top bracket connected between the two side sheet metal brackets, and the back bottom bracket, the back middle bracket, and the back top bracket are secured between the two side sheet metal brackets by laser welding.

The technical scheme provided by the application has the technical effects that: through optimizing the structure and add the driving disc to be provided with driving disc cooperation boss on this driving disc, and set up the lateral part panel beating support cooperation hole that corresponds the cooperation with it on the lateral part panel beating support, this driving disc cooperation boss cooperation is installed in this lateral part panel beating support cooperation hole, the in-process of seat back assembly back and forth rotation, lateral part panel beating support rotates together and drives the driving disc through the driving disc cooperation boss with it and rotate around, the driving disc drives transmission locking unit and handrail body together and moves, realize the follow-up of handrail body and seat back assembly, thereby realize the linkage of seat back angle and handrail gesture change, guarantee that the handrail body follows seat back assembly and follow-up and adaptability adjusts, more accord with ergonomic characteristics, the action uniformity is good, compact structure is simple and can promote the security of taking, simultaneously provide comfortable reliable use experience.

Drawings

FIG. 1 is a schematic diagram of an overall structure of an embodiment of the present application;

FIG. 2 is an exploded view of the embodiment of FIG. 1;

fig. 3 is an exploded view of the embodiment of fig. 1 in another perspective.

In the figure: 1. the seat backrest comprises a seat backrest assembly, 11, a side sheet metal bracket, 111, a side sheet metal bracket matching hole, 12, a backrest bottom bracket, 13, a backrest middle bracket and 14, and a backrest top bracket; 2. the angle adjuster is connected with the bracket and 21. The stop limit groove; 3. the device comprises an adjuster unit, a backrest driving motor module, a recliner body, a synchronous rod, a limit stop point bracket and a 341 limit stop point bracket stop part, wherein the adjuster unit is provided with a backrest driving motor module, a recliner body and a synchronous rod; 4. the handrail body, 41, a handrail framework, 411, a handrail framework connecting block, 4111, a handrail framework connecting plate matching hole; 5. a handrail drive motor module, 51. A power take-off shaft, 511. External splines; 6. the transmission disc is provided with a transmission disc matching boss and a transmission disc matching boss, an internal spline hole and a transmission disc connecting block, wherein the transmission disc is provided with a transmission disc matching boss and a transmission disc connecting block; 7. the transmission includes a transmission locking unit, 71, an inner housing, 711, an inner housing attachment hole, 72, an outer housing, 73, an attachment locking assembly, 74, a handrail drive shaft, 741, a handrail drive shaft mating wedge surface, 75, a transmission, 751, a transmission sleeve wedge block, 752, a transmission mounting plate.

Detailed Description

The following detailed description of the embodiments is, therefore, not to be taken in a limiting sense, and any equivalents, which are merely in form and not in nature, are contemplated as falling within the scope of the present application.

In the following description, any reference to the directional or azimuthal aspects of up, down, left, right, front and rear is not to be construed as a specific limitation on the solution provided by the present application, since the positional states in which the illustrations are being described are shown.

Referring to fig. 1-3, an automotive seating arrangement with a follower arm is shown, comprising a seat back assembly 1, the seat back assembly 1 having a pair of side sheet metal brackets 11 connected together; the pair of angle regulator connecting brackets 2 are respectively arranged at the bottom positions of the side sheet metal brackets 11 on the left side and the right side, and the pair of angle regulator connecting brackets 2 are fixedly connected with the seat bottom pelvis frame; an adjuster unit 3, the adjuster unit 3 is used for adjusting the angle of the seat back assembly 1 and is installed between the two aforementioned recliner connecting brackets 2.

The technical key points of the technical scheme provided by the application are as follows: the car seat device with the follow-up armrests further comprises an armrests body 4, wherein the armrests body 4 is arranged at one side position of the seat back assembly 1, as shown in fig. 1, the number of the armrests body 4 is one, the armrests body 4 is arranged at the outer position of one side sheet metal bracket 11 positioned at the right side, and of course, the number and the installation position of the armrests body 4 can be changed correspondingly according to actual requirements, for example, the number of the armrests body 4 can be two, and the armrests body 4 can be respectively arranged at the left side position and the right side position of the seat back assembly 1; the handrail driving motor module 5 is arranged at the inner side position of one side sheet metal bracket 11 close to the handrail body 4, the output end of the handrail driving motor module 5 is also in transmission connection with a power output shaft 51, and the power output shaft 51 penetrates out of the side sheet metal bracket 11; a driving disc 6 disposed at an outer side position of the side sheet metal bracket 11 on the right side, corresponding to the handrail driving motor module 5, the power output shaft 51 penetrating the driving disc 6 and being in driving connection therewith, a driving disc engaging boss 61 being formed on a surface of the driving disc 6 facing the side sheet metal bracket 11, and a side sheet metal bracket engaging hole 111 being formed in the body of the side sheet metal bracket 11, the driving disc engaging boss 61 being engaged in the side sheet metal bracket engaging hole 111 and being rotatable therein; the transmission locking unit 7 is arranged between the transmission disc 6 and the handrail body 4 and is in transmission connection with the transmission disc and the handrail body 4, and the transmission locking unit 7 can drive the handrail body 4 to rotate under the drive of the transmission disc 6 and can realize locking hovering of the driving handrail body 4.

Referring to fig. 2, an external spline 511 is disposed on the shaft body of the power output shaft 51, and an internal spline hole 62 is disposed in the driving disk 6, the shape of the internal spline hole 62 is adapted to the shape of the external spline 51, and the external spline 511 can be fitted into the internal spline hole 62, so as to achieve the fit installation of the power output shaft 51 and the driving disk 6.

Further, the transmission locking unit 7 includes an inner casing 71, an outer casing 72, a connecting locking assembly 73 and a handrail driving shaft 74; the inner cover 71 is close to the driving disc 6, the inner cover 71 is fixedly connected with the driving disc 6 body, and the driving disc 6 can drive the inner cover 71 to rotate; the outer cover 72 is disposed close to the handrail body 4, the connection locking assembly 73 is connected between the inner cover 71 and the outer cover 72, the handrail driving shaft 74 passes through the connection locking assembly 73 and the outer cover 72, the handrail driving shaft 74 is in transmission connection with the connection locking assembly 73, and the handrail driving shaft 74 also extends into the handrail body 4 and can drive the handrail body 4 to rotate; the connection locking assembly 73 can stably provide a damping force to the armrest driving shaft 74, so as to achieve a reliable hovering operation of the armrest body 4, and the internal structure and the working principle of the connection locking assembly 73 can be referred to in patent document CN218750445U (an armrest locking hovering mechanism of an automobile seat) filed by the inventor, and will not be described herein.

Referring to fig. 2 in combination with fig. 3, a plurality of driving disc connection blocks 63 are protruded on a surface of the driving disc 6 on a side far from the side sheet metal support 11, and a plurality of inner casing connection holes 711 are formed on the inner casing 71 of the driving locking unit 7 at positions corresponding to the plurality of driving disc connection blocks 63, and the plurality of driving disc connection blocks 63 can be fitted into the corresponding inner casing connection holes 711, thereby realizing the fitting connection of the driving disc 6 body and the inner casing 71 body.

In this embodiment, a handrail frame 41 is further disposed in the handrail body 4, the handrail frame 41 is in a strip shape, an end portion of the handrail frame 41 in a length direction, which is close to the transmission locking unit 7, is cooperatively provided with a handrail frame connecting block 411, a transmission member 75 is further sleeved at an end portion of the handrail driving shaft 74 in a length direction of the transmission locking unit 7, the transmission member 75 can be driven to rotate by the handrail driving shaft 74, and the transmission member 75 passes through the handrail frame 41 body and is cooperatively installed with the handrail frame connecting block 411, thereby realizing transmission connection between the handrail driving shaft 74 and the transmission member 75 and driving of the handrail driving shaft 74 to the handrail body 4.

When the posture of the armrest body 4 needs to be changed, that is, the armrest body rotates to achieve the optimal riding angle of a human body, the armrest driving motor module 5 is electrified and controls the driving motor therein to work, the armrest driving motor module 5 drives the power output shaft 51 to rotate, the power output shaft 51 further drives the transmission disc 6 to axially rotate, the transmission disc matching boss 61 axially rotates in the lateral sheet metal bracket matching hole 111, the transmission disc 6 further drives the inner cover shell 71, the inner cover shell 71 drives the connecting locking assembly 73 and the armrest driving shaft 74 to rotate, and the armrest driving shaft 74 finally drives the transmission piece 75 and the armrest framework 41 to rotate, so that the angle adjustment of the armrest body 4 is achieved; and in the process of front and back rotation of the seat back assembly 1, the lateral sheet metal bracket 11 rotates together and drives the transmission disc 6 to rotate back and forth together through the transmission disc matching boss 61 matched with the lateral sheet metal bracket, and the transmission disc 6 drives the transmission locking unit 7 and the armrest body 4 to move together, so that the armrest body 4 and the seat back assembly 1 are driven, the linkage of the seat back angle and the armrest posture change is realized, and the comfort level of use is effectively improved.

Further, the driving member 75 includes a driving member sleeve 751 and a driving member mounting plate 752, the driving member sleeve 751 is mounted on an end portion of the shaft body of the handrail driving shaft 74, the driving member mounting plate 752 is formed on a side of the driving member sleeve 751 away from the shaft body of the handrail driving shaft 74, and a handrail frame connection plate mounting hole 4111 is formed in the handrail frame connection block 411 and at a position corresponding to the driving member mounting plate 752, the shape of the handrail frame connection plate mounting hole 4111 is adapted to the shape of the driving member mounting plate 752, and the driving member mounting plate 752 is mounted in the handrail frame connection plate mounting hole 4111 in a fitting manner, thereby connecting the driving member 75 with the handrail frame 41.

Further, a pair of handrail drive shaft engagement wedge surfaces 741 are formed on one end portion of the shaft body of the handrail drive shaft 74 near the transmission member 75, and a transmission member sleeve wedge 751 is formed in the transmission member sleeve 751 at positions corresponding to the two handrail drive shaft engagement wedge surfaces 741, and the two handrail drive shaft engagement wedge surfaces 741 are respectively engaged against the respective corresponding transmission member sleeve wedge 751, thereby achieving transmission connection between the handrail drive shaft 74 and the transmission member 75.

Referring to fig. 1, the recliner unit 3 includes a backrest driving motor module 31, a pair of recliner bodies 32, a synchronizing rod 33 and a stop bracket 34; the backrest driving motor module 31 is disposed inside one side sheet metal bracket 11 opposite to the armrest driving motor module 5, one ends of the two recliner bodies 32 are respectively mounted at top end portions of the two recliner connecting brackets 2, the other ends of the two recliner bodies 32 are respectively fixedly mounted at bottom end portions of the two side sheet metal brackets 11, both end portions in the length direction of the synchronizing rod 33 respectively pass through the two recliner bodies 32, the synchronizing rod 33 also passes through an output end of the backrest driving motor module 31, and the backrest driving motor module 31 realizes driving operation on the two recliner bodies 32 through the synchronizing rod 33; the limit stop point bracket 34 is fixedly installed at an outer portion of a proximal end portion of the side sheet metal bracket 11 opposite to the armrest driving motor module 5, and the limit stop point bracket 34 is disposed at a lower position corresponding to the backrest driving motor module 31, and the limit stop point bracket 34 can abut against the recliner connecting bracket 2 and limit a rotation angle of the backrest assembly 1.

In this embodiment, an annular stop limit groove 21 is formed at the top end of the recliner connecting bracket 2, and a stop point bracket stop portion 341 is formed by bending the lower portion of the stop point bracket 34, and the stop point bracket stop portion 341 is cooperatively disposed in the stop limit groove 21 and can be respectively abutted to the end positions of the front and rear ends of the stop limit groove 21, thereby limiting the rotation angle of the side sheet metal bracket 11, i.e., the seat back assembly 1.

When the seat back assembly 1 is required to rotate in use, the seat back assembly 1 is powered on and controls a driving motor in the seat back assembly 1 to work when the seat back assembly 1 rotates forwards, the seat back driving motor module 31 drives the synchronous rod 33 to rotate forwards, the synchronous rod 33 rotates forwards to drive the two side angle adjuster bodies 32 to rotate forwards simultaneously, the angle adjuster bodies 32 further drive the two side sheet metal brackets 11 to rotate forwards, so that the seat back assembly 1 rotates forwards together, and when a limit stop point bracket stop part 341 of the limit stop point bracket 34 is abutted to the front end part of the limit stop groove 21, the seat back assembly 1 rotates to the forefront end position; similarly, when the backrest assembly 1 integrally rotates backwards, the backrest driving motor module 31 is electrified and controls the driving motor therein to work, the backrest driving motor module 31 drives the synchronizing rod 33 to rotate reversely, the synchronizing rod 33 rotates positively to drive the angle adjuster bodies 32 on two sides to rotate reversely simultaneously, the angle adjuster bodies 32 further drive the sheet metal brackets 11 on two sides to rotate backwards, so that the backrest assembly 1 rotates backwards together, and when the limit stop bracket stop part 341 of the limit stop bracket 34 abuts against the rear end part of the limit stop limit groove 21, the backrest driving motor module 31 is blocked, and at the moment, the backrest assembly 1 rotates to the rearmost position.

In this embodiment, the seat back assembly 1 further includes a back bottom bracket 12, a back middle bracket 13 and a back top bracket 14 connected between the two side sheet metal brackets 11; preferably, the backrest bottom bracket 12, the backrest middle bracket 13 and the backrest top bracket 14 are fixed between the two side sheet metal brackets 11 by means of laser welding.

In summary, the technical scheme provided by the application overcomes the defects in the prior art, successfully completes the task of the application, and faithfully honors the technical effects carried by the applicant in the technical effect column above.

Claims (10)

1. An automotive seating arrangement with a follower arm includes a seat back assembly (1), the seat back assembly (1) having a pair of side sheet metal brackets (11) connected together; the angle adjuster connecting brackets (2) are respectively arranged at the bottom positions of the side sheet metal brackets (11) at the left side and the right side; an adjuster unit (3), wherein the adjuster unit (3) is used for realizing the angle adjustment of the seat back assembly (1) and is arranged between two adjuster connecting brackets (2); characterized by further comprising: a armrest body (4), the armrest body (4) being disposed at a side position of the seat back assembly (1); the handrail driving motor module (5) is arranged at the inner side position close to one side sheet metal bracket (11) of the handrail body (4), the output end of the handrail driving motor module (5) is also in transmission connection with a power output shaft (51), and the power output shaft (51) outwards penetrates out of the side sheet metal bracket (11); the driving disc (6) is arranged at the outer side position of the side sheet metal bracket (11) corresponding to the handrail driving motor module (5), the power output shaft (51) penetrates the driving disc (6) and is in driving connection with the driving disc, a driving disc matching boss (61) is convexly arranged on the surface of one side of the driving disc (6) facing the side sheet metal bracket (11), a side sheet metal bracket matching hole (111) is formed in the body of the side sheet metal bracket (11), and the driving disc matching boss (61) is matched and installed in the side sheet metal bracket matching hole (111) and can rotate in the side sheet metal bracket matching hole; the transmission locking unit (7) is arranged between the transmission disc (6) and the handrail body (4) and is in transmission connection with the transmission disc and the handrail body (4), and the transmission locking unit (7) can drive the handrail body (4) to rotate under the drive of the transmission disc (6) and can realize the locking of the driving handrail body (4).

2. A car seat assembly having a follower arm rest as defined in claim 1, wherein: the power output shaft (51) is characterized in that an external spline (511) is arranged on the shaft body of the power output shaft (51), an internal spline hole (62) is formed in the transmission disc (6), the shape of the internal spline hole (62) is matched with that of the external spline (51), and the external spline (511) can be matched and installed in the internal spline hole (62), so that the power output shaft (51) and the transmission disc (6) can be installed in a matched mode.

3. A car seat assembly having a follower arm rest as defined in claim 1, wherein: the transmission locking unit (7) comprises an inner housing (71), an outer housing (72) and a connecting locking assembly (73) and a handrail driving shaft (74); the inner cover shell (71) is close to the transmission disc (6), the inner cover shell (71) is fixedly connected with the transmission disc (6) body, and the transmission disc (6) can drive the inner cover shell (71) to rotate; the outer cover shell (72) is arranged at a position close to the handrail body (4), the connecting locking assembly (73) is connected between the inner cover shell (71) and the outer cover shell (72), the handrail driving shaft (74) penetrates through the connecting locking assembly (73) and the outer cover shell (72), the handrail driving shaft (74) is in transmission connection with the connecting locking assembly (73), and the handrail driving shaft (74) also penetrates into the handrail body (4) and can drive the handrail body (4) to rotate.

4. A car seat assembly having a follower arm rest as defined in claim 3, wherein: a plurality of transmission disc connecting blocks (63) are convexly arranged on the surface of one side, far away from the lateral sheet metal support (11), of the transmission disc (6), a plurality of inner cover shell connecting holes (711) are formed in the inner cover shell (71) of the transmission locking unit (7) at positions corresponding to the plurality of transmission disc connecting blocks (63), and the plurality of transmission disc connecting blocks (63) can be matched and installed into the corresponding inner cover shell connecting holes (711), so that the matched connection of the transmission disc (6) body and the inner cover shell (71) body is realized.

5. A car seat assembly having a follower arm rest as defined in claim 3, wherein: the handrail body (4) is internally provided with a handrail framework (41), the handrail framework (41) is strip-shaped, one end part, close to the transmission locking unit (7), of the handrail framework (41) in the length direction is matched with a handrail framework connecting block (411), one end part of the handrail driving shaft (74) of the transmission locking unit (7) in the length direction is also sleeved with a transmission piece (75), the handrail driving shaft (74) can drive the transmission piece (75) to rotate, and the transmission piece (75) penetrates through the handrail framework (41) body and is matched with the handrail framework connecting block (411) to be installed together, so that transmission connection between the handrail driving shaft (74) and the transmission piece (75) is realized, and driving of the handrail driving shaft (74) to the handrail body (4) is realized.

6. A car seat assembly having a follower arm rest as defined in claim 5, wherein: the transmission member (75) comprises a transmission member sleeve (751) and a transmission member mounting plate (752), the transmission member sleeve (751) is mounted on one end of the shaft body of the handrail driving shaft (74) in a matched manner, the transmission member mounting plate (752) is formed on one side, far away from the shaft body of the handrail driving shaft (74), of the transmission member sleeve (751), and a handrail framework connecting plate fitting hole (4111) is formed in the handrail framework connecting block (411) and at a position corresponding to the transmission member mounting plate (752), the shape of the handrail framework connecting plate fitting hole (4111) is matched with that of the transmission member mounting plate (752), and the transmission member mounting plate (752) is mounted in the handrail framework connecting plate fitting hole (4111) in a matched manner, so that the connection of the transmission member (75) and the handrail framework (41) is achieved.

7. A car seat assembly having a follower arm rest as defined in claim 6, wherein: a pair of handrail drive shaft mating wedge surfaces (741) are formed on one end portion of the handrail drive shaft (74) shaft body close to the transmission member (75), a transmission member sleeve wedge block (751) is formed in the transmission member sleeve (751) at positions corresponding to the two handrail drive shaft mating wedge surfaces (741), and the two handrail drive shaft mating wedge surfaces (741) are respectively matched and abutted to the corresponding transmission member sleeve wedge blocks (7511), so that transmission connection between the handrail drive shaft (74) and the transmission member (75) is realized.

8. A car seat assembly having a follower arm rest as defined in claim 1, wherein: the angle adjuster unit (3) comprises a backrest driving motor module (31), a pair of angle adjuster bodies (32), a synchronous rod (33) and a limiting stop point bracket (34); the backrest driving motor module (31) is arranged on the inner side of one side sheet metal bracket (11) opposite to the handrail driving motor module (5), one ends of the two angle adjuster bodies (32) are respectively arranged at the top end parts of the two angle adjuster connecting brackets (2), the other ends of the two angle adjuster bodies (32) are respectively fixedly arranged at the bottom end parts of the two side sheet metal brackets (11), the two end parts of the synchronizing rod (33) in the length direction respectively penetrate through the two angle adjuster bodies (32), the synchronizing rod (33) also penetrates through the output end of the backrest driving motor module (31), and the backrest driving motor module (31) realizes driving operation on the two angle adjuster bodies (32) through the synchronizing rod (33); the limit stop point support (34) is fixedly arranged at the outer side part of the end part of the near bottom end of the side sheet metal support (11) opposite to the handrail driving motor module (5), the limit stop point support (34) is arranged at the lower position corresponding to the backrest driving motor module (31), and the limit stop point support (34) can be abutted to the angle adjuster connecting support (2) and limit the rotation angle of the backrest assembly (1).

9. A car seat assembly having a follower arm rest as defined in claim 8, wherein: an annular stop limit groove (21) is formed in the top end part of the angle adjuster connecting support (2), a stop limit support stop part (341) is formed by bending the lower part of the stop limit support (34), and the stop limit support stop part (341) is matched with the stop limit groove (21) and can be respectively abutted to the end parts of the front end and the rear end of the stop limit groove (21), so that the limit of the rotation angle of the side sheet metal support (11), namely the seat backrest assembly (1), is realized.

10. A car seat assembly having a follower arm rest as defined in claim 1, wherein: the seat backrest assembly (1) further comprises a backrest bottom bracket (12), a backrest middle bracket (13) and a backrest top bracket (14) which are connected between the two side metal plate brackets (11), and the backrest bottom bracket (12), the backrest middle bracket (13) and the backrest top bracket (14) are fixed between the two side metal plate brackets (11) through laser welding.