CN212267291U

CN212267291U - Leg support driving device of automobile seat

Info

Publication number: CN212267291U
Application number: CN202021362465.9U
Authority: CN
Inventors: 邹耀忠
Original assignee: Jiangsu Zhongming Xianghe Seiko Co ltd
Current assignee: Jiangsu Zhongming Xianghe Seiko Co ltd
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2021-01-01
Anticipated expiration: 2030-07-13

Abstract

The utility model provides a leg of car seat holds in palm drive arrangement, includes a pair of mounting panel, a pair of establish on the mounting panel and one end with correspond the articulated link assembly of side mounting panel and one establish at the two link assembly other ends and through the leg that link assembly extends/draws in and hold in the palm the subassembly, characteristics: the inner side surface of the mounting plate is provided with a driving device, the driving device comprises a bottom plate fixed on the mounting plate, a rotating seat fixed on the bottom plate, a worm and gear device rotationally arranged on the rotating seat, a motor in transmission connection with the worm and gear device, and a screw rod in threaded connection with the worm and gear device and capable of stretching back and forth, a driving beam is arranged between the two connecting rod assemblies, a driving plate is arranged on the driving beam, and one end of the screw rod is hinged with the driving plate and pulls/pushes the connecting rod assemblies to enable the leg support assembly to complete stretching/folding actions. Not only avoided the condition that screw rod and link assembly obstructed each other, still improved link assembly's extension scope and played the guard action to drive arrangement, guaranteed the holistic joint strength of drive arrangement simultaneously.

Description

Leg support driving device of automobile seat

Technical Field

The utility model belongs to the technical field of auto-parts, concretely relates to leg support drive arrangement of car seat.

Background

With the continuous progress of science and technology, the development of the automobile industry is leapfrog, the requirements of people on the quality and the comfort level of an automobile are continuously improved, wherein a seat is one of indispensable components of the automobile, various seats are diversified in order to meet the requirements of different people, the adjustment of the front and back positions of the seat and the adjustment of the inclination angle of the backrest of the seat are the most basic requirements of the automobile seat, especially on some commercial vehicles, the requirements of people on the comfort level of the seat are more rigorous, and the purchasing intention of people can be influenced even, a leg support is an important factor for improving the comfort level of the seat, a manual mode or an electric mode is generally adopted to drive a connecting rod to extend or retract a leg supporting plate, and the electric leg support is popular among consumers.

In the prior art, for example, a car seat leg support framework related to the Chinese utility model patent publication No. CN202764741U, and for example, a commercial seat electric leg support disclosed in the Chinese utility model patent publication No. CN207860026U, both adopt an angle modulation motor to drive a synchronous rod to rotate, and further drive a connecting rod to drive a structure of an extension or contraction leg support member, and the leg support structure has the defects that firstly, the extension and contraction speed is slow, and abnormal sound is easily generated, and the abnormal sound is caused by directly twisting the synchronous rod by the motor; secondly, when the leg rest is stressed in the extension state, the synchronizing rod can be subjected to torsion and directly acts on the angle adjusting motor, and the service life of the motor can be greatly shortened.

Still for example "an improved generation MPV seat power leg holds in palm" that china utility model patent publication No. CN209141972U disclosed, include: the fixing assembly is provided with a driving device, and the driving device is movably connected with the connecting piece; one end of the connecting piece is movably connected with the fixed assembly piece, and the other end of the connecting piece is movably connected with the connecting rod assembly; the leg support piece is arranged on the connecting rod assembly. The driving device adopts a structure which is arranged on the fixed plate and drives the connecting piece to extend or contract by pushing the screw rod to extend back and forth, the problems that the extension and contraction speed of the leg support is slow and abnormal sound is easily generated are solved, but due to the structural limitation of the driving device, the screw rod can only extend and contract in one direction, the length and the extension angle of the screw rod directly influence the extension range of the connecting rod assembly, the connecting rod assembly can move up and down in a certain range with the hinged position of the screw rod in the extension process and mutually generate obstruction, the extension range of the connecting rod assembly is limited, the driving device can be damaged, the problem can be solved by integrally hinging the driving device on the fixed assembly, but the fixing strength of the driving device can be influenced, and the leg support can be easily damaged.

In view of the above, there is a need for a leg rest driving device for an automobile seat, which has a simple structure and a high fixing strength of a driving device, can improve working efficiency without generating abnormal noise, and can make a screw rotate up and down within a certain angle to compensate displacement generated in the process of extension and retraction of a link assembly. The applicant has therefore made an advantageous design, in the context of which the solution to be described below is made.

Disclosure of Invention

The task of the utility model is to provide a car seat's leg holds in palm drive arrangement, the structure that helps optimizing drive arrangement makes the screw rod can rotate in certain angle and improve link assembly's extension scope and play the guard action to drive arrangement, is favorable to improving drive arrangement's fixed knot structure and improves joint strength.

The task of the utility model is accomplished like this, a leg of car seat holds in palm drive arrangement, including a pair of mounting panel that sets up face to face, a pair of setting respectively on the mounting panel and one end with correspond side-mounting board articulated link assembly and one set up the leg that stretches/draws in at the two link assembly other ends and through link assembly and hold in the palm the subassembly, its characterized in that: the leg support assembly comprises a mounting plate, a motor and a screw rod, wherein the mounting plate is provided with an inner side surface, the inner side surface is provided with a driving device, the driving device comprises a bottom plate fixed on the mounting plate, a rotating seat fixed on the bottom plate, a worm and gear device rotationally arranged on the rotating seat, the motor is in transmission connection with the worm and gear device, the screw rod is in threaded connection with the worm and gear device and can stretch back and forth, a driving beam is formed between the two connecting rod assemblies, a driving plate is fixed on the driving beam, and one end of the screw rod is hinged with the driving plate and pushes/pulls the connecting rod assemblies to enable the leg support assembly to complete stretching/folding actions.

In a specific embodiment of the present invention, a rotating seat cavity, which is through from left to right, is formed in the rotating seat, a circular arc-shaped rotating groove is formed on the front side surface of the rotating seat cavity along the width direction, a front screw abdicating groove is formed in the middle position of the rotating groove of the rotating seat along the height direction, an arc surface is formed on the rear side surface of the rotating seat cavity, and a rear screw abdicating groove is formed in the position of the arc surface corresponding to the front screw abdicating groove; a pair of rotating support legs which are in running fit with the rotating grooves are formed on the worm gear device, and one side face of the worm gear device is abutted against the arc face and slides up and down along the arc face direction of the arc face.

In another specific embodiment of the present invention, the rotating base is formed with a set of limiting posts on a side surface facing the bottom plate, and the rotating base is respectively provided with a rotating base fixing screw hole penetrating through the width direction thereof at a position near the limiting posts; the bottom plate is respectively provided with a limiting hole and a fixing hole at positions corresponding to the limiting column and the rotating seat fixing screw hole, the rotating seat is connected with the bottom plate through a group of rotating seat fixing screws, and the rotating seat fixing screws fix the bottom plate and the rotating seat after sequentially penetrating through the corresponding fixing holes and the rotating seat fixing screw holes.

In another specific embodiment of the present invention, a pair of the mounting plates has a mounting beam fixed therebetween, a welding groove matched with the mounting beam is formed on one side of the bottom plate, and a welding plate is bent toward one side of the adjacent mounting plate on the other side of the bottom plate, the welding groove is fixed to the mounting beam, and the welding plate is fixed to the corresponding mounting plate.

In another specific embodiment of the present invention, the worm and gear device comprises a worm and gear seat, a worm wheel, a worm engaged with the worm wheel, and a cover sliding against the inner side surface of the rotary seat, wherein the worm and gear seat is matched with the rotary seat cavity, a worm cavity extending inwards from the seat body is arranged in the middle of the left side surface of the worm and gear seat, a worm wheel cavity penetrating through the worm and gear seat is arranged backwards on the wall body below the worm cavity, the worm wheel is arranged in the worm wheel cavity, the front end and the rear end of the worm wheel are narrowed and contracted to form a worm wheel supporting shaft, worm wheel bearings are respectively arranged on the worm wheel supporting shafts at the front end and the rear end, a step is formed on the wall body at the front side of the worm cavity, wherein the worm wheel bearing at the front end abuts against the step, a bearing cavity is formed on one side surface of the cover, wherein the worm wheel bearing at the rear end is embedded in the bearing cavity, the middle part of the worm wheel is provided with a worm wheel screw hole which runs through the worm wheel screw hole in the length direction, the step is provided with a screw rod abdicating hole at the position corresponding to the worm wheel screw hole, the sealing cover is provided with a sealing cover screw rod abdicating hole at the position corresponding to the worm wheel screw hole, the screw rod is arranged in the screw rod abdicating hole, is connected with the worm wheel screw hole in the middle of the worm wheel in a penetrating way, the motor is fixed on the outer side of the left side surface of the worm wheel and worm rod seat, the motor extends into the worm cavity to form a motor shaft, the motor shaft is fixed with a worm, the worm is positioned above the worm wheel and is meshed with the worm wheel screw hole and the worm wheel screw hole, a bearing seat is arranged at the end part of the motor shaft, which is far away from the motor.

The utility model discloses a still have a concrete embodiment, the one end of worm wheel and worm seat extends the roating seat chamber of roating seat and is formed with a motor support respectively on the front and back both sides face of extending the end, has seted up a motor fixed screw on this motor support respectively, the motor constitute respectively in the position department that lies in two motor supports and have a motor fixed plate, the motor fixed plate is fixed with the motor fixed screw that corresponds through a motor set screw respectively, the roating seat constitute on a side end face that the roating seat extends to the roating seat chamber and have one to keep off the foot, should keep off the foot and lean on the bottom surface at worm wheel and worm seat.

In a further embodiment of the invention, the screw is formed with a joint at the end facing backwards, which joint is hinged to the drive plate by means of a bolt, and the screw is formed with a stop ring at a position close to the body of the rod having the joint end and outside the swivel.

In a more specific embodiment of the present invention, the connecting rod assembly includes a power arm hinged to the mounting plate, a power arm connecting rod hinged to the power arm, a fixed connecting rod hinged to the power arm connecting rod and the mounting plate, a leg support connecting rod hinged to the power arm connecting rod, and a support connecting rod hinged to the power arm connecting rod and having two ends respectively hinged to the end of the power arm and the middle of the leg support connecting rod, the driving beam is disposed between the two power arms and close to the end hinged to the mounting plate, and the leg support assembly is disposed on the leg support connecting rod.

In yet another specific embodiment of the present invention, the leg support assembly includes a pair of leg support plates and a pair of leg support brackets, the two leg support plates are respectively disposed between the two leg support connecting rods at intervals, the two leg support brackets are respectively fixed on the leg support connecting rods of the corresponding sides and are U-shaped to be opened outwards, and the leg support plates and the leg support brackets are respectively fixed with the leg support connecting rods.

In a still more specific embodiment of the present invention, a stiffening beam is fixed between the two support links.

The utility model adopts the above structure after, beneficial effect who has: the rotary seat is fixedly arranged on the bottom plate, and the worm gear device, the motor and the screw rod are rotatably arranged on the rotary seat, so that the screw rod can move back and forth to complete the stretching/drawing action of the leg support assembly, and when the connecting rod assembly moves up and down in the stretching process, the worm gear device rotates around the rotating groove through the rotating support legs, so that the screw rod rotates up and down along with the worm gear seat to compensate the displacement generated by the connecting rod assembly, the condition that the screw rod and the connecting rod assembly are mutually blocked is avoided, the stretching range of the connecting rod assembly is further improved, and the driving device is protected; meanwhile, the fixed installation of the rotary seat can ensure the integral connection strength of the driving device.

Drawings

Fig. 1 is a schematic perspective view of an embodiment of the present invention.

Fig. 2 is a schematic structural view of the embodiment in fig. 1 in a furled state.

Fig. 3 is a schematic structural diagram of the embodiment of fig. 1 in an extended state.

In the figure: 1. mounting plates, 11. mounting beams; 2. the leg support device comprises a connecting rod assembly, 21, a driving beam, 211, a driving plate, 22, a power arm, 23, a power arm connecting rod, 24, a fixed connecting rod, 25, a leg support connecting rod, 26, a support connecting rod and 261, a reinforcing beam; 3. leg support component, 31, leg supporting plate, 32, leg support bracket; 4. the motor comprises a driving device, a 41 bottom plate, a 411 limit hole, a 412 fixing hole, a 413 welding groove, a 414 welding plate, a 42 rotating seat, a 421 rotating seat cavity, a 422 rotating groove, a 423 front screw rod abdicating groove, a 424 arc surface, a 425 rear screw rod abdicating groove, a 426 limiting column, a 427 rotating seat fixing screw hole, a 428 baffle foot, a 429 rotating seat fixing screw, a 43 worm and gear device, a 431 worm and gear seat, a 4311 worm and gear cavity, a 4312 worm and gear cavity, a 4313 step, a 4314 screw rod abdicating hole, a 4315 rotating foot, a 4316 motor bracket, an 43161 motor fixing screw hole, a 432 worm gear, a 4321 worm and gear bearing, a 4323 worm and gear screw hole, a 433 worm, a 434 gland, a 4341 bearing cavity, a 4342 gland screw rod abdicating hole, a 44 motor, a 441 motor shaft, a 444 bearing seat, a 444 motor shaft, a motor fixing plate, a 443 motor shaft, a motor shaft sealing ring, a 4323 worm and a screw rod abdicating hole, a 4344, 445. The motor fixes the screw, 45. the screw rod, 451. the hinged joint, 452. the bolt, 453. the retaining ring.

Detailed Description

The following is a detailed description by way of example, but the description of the example is not intended to limit the scope of the present invention, and any equivalent changes made according to the present invention, which are merely formal and insubstantial, should be considered as technical solutions of the present invention.

In the following description, all the concepts related to the directions or orientations of up, down, left, right, front and rear are based on the position shown in fig. 1, and thus should not be construed as particularly limiting the technical solutions provided by the present invention.

Referring to fig. 1, 2 and 3, the present invention relates to a leg rest driving device for a car seat, comprising a pair of mounting plates 1 disposed face to face, a pair of connecting rods 2 disposed on the mounting plates 1 respectively and having one end hinged to the corresponding mounting plate 1, and a leg rest assembly 3 disposed at the other end of the connecting rods 2 and extending/retracting through the connecting rods 2, wherein a driving device 4 is disposed on the inner side of one of the mounting plates 1, the driving device 4 is disposed on the inner side of the right mounting plate 1 in the embodiment, the driving device 4 comprises a bottom plate 41 fixed on the mounting plate 1, a rotary base 42 fixed on the bottom plate 41, a worm gear 43 rotatably disposed in the rotary base 42, a motor 44 drivingly connected to the worm gear 43, and a screw 45 threadedly connected to the worm gear 43 and extending/retracting back and forth, a driving beam 21 is formed between the two connecting rod assemblies 2, a driving plate 211 is fixed on the driving beam 21, and one end of the screw 45 is hinged with the driving plate 211 and pushes/pulls the connecting rod assemblies 2 to enable the leg rest assembly 3 to complete the stretching/folding action.

Furthermore, a rotating seat cavity 421 penetrating left and right is formed in the rotating seat 42, a circular arc-shaped rotating groove 422 is formed in the front side surface of the rotating seat cavity 421 along the width direction, a front screw abdicating groove 423 is formed in the middle position of the rotating seat 42 along the height direction in the rotating groove 422, a circular arc surface 424 is formed on the rear side surface of the rotating seat cavity 421, and a rear screw abdicating groove 425 is formed in the position of the circular arc surface 424 corresponding to the front screw abdicating groove 423; the worm gear 43 is formed with a pair of rotation legs 4315 rotatably engaged with the rotation grooves 422, and one side surface of the worm gear 43 abuts against the arc surface 424 and slides up and down along the arc surface direction of the arc surface.

Furthermore, a set of limiting posts 426 is formed on a side surface of the rotating base 42 facing the bottom plate 41, and a rotating base fixing screw hole 427 penetrating through the rotating base 42 in the width direction is respectively formed at a position near the limiting posts 426; the bottom plate 41 is provided with a position-limiting hole 411 and a fixing hole 412 at positions corresponding to the position-limiting post 426 and the rotating base fixing screw hole 427, the rotating base 42 is connected to the bottom plate 41 by a set of rotating base fixing screws 429, wherein the rotating base fixing screws 429 sequentially pass through the corresponding fixing holes 412 and the rotating base fixing screw holes 427 and then fix the bottom plate 41 and the rotating base 42.

Further, an installation beam 11 is fixed between a pair of the installation plates 1, a welding groove 413 matched with the installation beam 11 is formed on one side of the bottom plate 41, a welding plate 414 is bent towards one side of the adjacent installation plate 1 on the other side of the bottom plate 41, the welding groove 413 is fixed with the installation beam 11, the welding plate 414 is fixed with the corresponding installation plate 1, and the fixing is preferably welding fixing in the embodiment.

Further, the worm and gear device 43 includes a worm and gear seat 431 engaged with the rotary seat chamber 421, a worm wheel 432, a worm 433 engaged with the worm wheel 432, and a cover 434 sliding against the inner side of the rotary seat 42, a worm chamber 4311 extending inward into the seat body is provided in the middle of the left side of the worm and gear seat 431, a worm wheel chamber 4312 penetrating through the worm and gear seat 431 is provided rearward on the wall body below the worm chamber 4311, the worm wheel 432 is provided in the worm wheel chamber 4312, the worm wheel 432 is respectively formed by narrowing the front and rear ends of the worm wheel 432 into a worm wheel supporting shaft 4321, worm wheel bearings 4322 are respectively provided on the worm wheel supporting shafts 4321 at the front and rear ends, a step 4313 is provided on the wall body at the front side of the worm chamber 4311, wherein the worm bearing 4322 at the front end abuts against the step 4313, a bearing chamber 4341 is provided on one side of the cover 434, wherein the worm bearing 4322 at the rear end is embedded in the bearing chamber 4341, a worm screw 4323 penetrating the middle of the worm wheel 432 in the length direction thereof, a screw hole 4314 at a position corresponding to the worm screw 4323 of the step 4313, a cap screw hole 4342 at a position corresponding to the worm screw 4323 of the cap 434, a screw 45 penetrating the screw hole 4314 and the cap screw hole 4342 and threadedly engaged with the worm screw 4323 in the middle of the worm wheel 432, the motor 44 fixed to the outside of the left side of the worm wheel base 431, the motor 44 extends a motor shaft 441 into the worm cavity 4311, the motor shaft 441 is fixed with the worm 433, the worm 433 is positioned above the worm wheel 432 and meshed with the worm wheel 432, a bearing 442 is arranged at one end of the motor shaft 441 far away from the motor 44, the bearing 442 is fixed to the worm seat 431 and is fitted with a sealing ring 443.

Furthermore, one end of the worm seat 431 extends out of the rotary seat cavity 421 of the rotary seat 42, and a motor support 4316 is formed on each of the front and rear side surfaces of the extending end, a motor fixing screw hole 43161 is formed on each of the motor supports 4316, a motor fixing plate 444 is formed on each of the motors 44 at the positions of the two motor supports 4316, each of the motor fixing plates 444 is fixed to the corresponding motor fixing screw hole 43161 by a motor fixing screw 445, and a blocking foot 428 is formed on the end surface of the rotary seat 42 at the side where the worm seat 431 extends out of the rotary seat cavity 421, and the blocking foot 428 abuts against the bottom surface of the worm seat 431.

Further, the aforementioned screw 45 is formed with a hinge head 451 at one end portion facing rearward, the hinge head 451 is hinged to the driving plate 211 by a bolt 452, and the screw 45 is formed with a stopper 453 at a position adjacent to the rod body having one end of the hinge head 451 and outside the swivel base 42.

Further, the aforementioned link assembly 2 includes a power arm 22 having one end hinged to the mounting plate 1, a power arm link 23 stacked in a crossed manner with the power arm 22 and having middle portions hinged to each other, a fixed link 24 hinged to one end of the power arm link 23 and having the other end hinged to the mounting plate 1, a leg rest link 25 hinged to the other end of the power arm link 23, and a support link 26 having both ends hinged to the end of the power arm 22 and the middle portion of the leg rest link 25, respectively, the aforementioned driving beam 21 is disposed between the two power arms 22 and close to the end hinged to the mounting plate 1, and the aforementioned leg rest assembly 3 is disposed on the leg rest link 25.

Further, the leg rest assembly 3 includes a pair of leg rest plates 31 and a pair of leg rest brackets 32, the two leg rest plates 31 are respectively disposed between the two leg rest links 25 at intervals, the two leg rest brackets 32 are respectively fixed on the leg rest links 25 on the corresponding sides and are opened outward in a U shape, the leg rest plates 31 and the leg rest brackets 32 are respectively fixed to the leg rest links 25, and in this embodiment, the fixing is preferably performed by welding. A reinforcing beam 261 is fixed between the two support links 26.

Referring to fig. 1 in combination with fig. 2 and 3, when the driving device 4 needs to be installed, the bottom plate 41 is welded to the installation beam 11 and the installation plate 1 through the welding groove 413 and the welding plate 414, the rotary base 42 is fixed to the bottom plate 41 through the rotary base fixing screw 429, the worm gear 43 is inserted into the rotary base cavity 421 of the rotary base 42, the rotary support leg 4315 is rotatably supported in the rotary groove 422, the cover 434 abuts against the arc surface 424 of the rotary base cavity 421 and can slide up and down, the blocking leg 428 abuts against one side surface of the worm gear 43, specifically against the bottom surface of the worm gear seat 431, at this time, the motor 44 is installed on the motor support 4316 of the worm gear seat 431 and drives the worm 433 and the worm wheel 432 to rotate through the motor shaft 441, and then the screw 45 sequentially passes through the rear screw abdicating groove 425, the mounting plate 414, and the mounting plate 414, The screw relief hole 4342 is covered and screwed with the worm gear screw hole 4323, and then penetrates out of the screw relief hole 4314 and the front screw relief groove 423, and finally the hinge head 451 of the screw 45 is hinged to the driving plate 211 through the bolt 452. As shown in fig. 2, when the leg rest assembly 3 needs to be folded, the motor 44 is driven to operate, the worm 433 drives the worm wheel 432 to rotate, so that the worm wheel screw hole 4323 drives the screw rod 45 to move forward and pull the driving plate 211 and the driving beam 21 of the connecting rod assembly 2 to rotate around the hinged position of the power arm 22 and the mounting plate 1, and the leg rest connecting rod 25 and the leg rest assembly 3 contract under the combined action of the power arm connecting rod 23, the fixed connecting rod 24 and the supporting connecting rod 26, thereby realizing the folding action of the leg rest assembly 3. As shown in fig. 3, when the leg rest assembly 3 needs to be extended, the motor 44 is driven to work in the opposite direction, the worm 433 drives the worm wheel 432 to rotate, so that the worm wheel screw hole 4323 drives the screw 45 to push the driving plate 211 and the driving beam 21 of the connecting rod assembly 2 backward to rotate around the hinge joint of the power arm 22 and the mounting plate 1 in the opposite direction, and the leg rest connecting rod 25 and the leg rest assembly 3 are extended under the combined action of the power arm connecting rod 23, the fixed connecting rod 24 and the supporting connecting rod 26, thereby completing the extending action of the leg rest assembly 3. In the process of folding and unfolding the leg rest assembly 3, the hinge joint between the driving plate 211 and the screw 45 in the connecting rod assembly 2 generates a certain vertical displacement, at this time, the worm gear device 43 rotates around the rotating groove 422 through the rotating support 4315, and the screw 45 rotates along with the rotation of the worm gear device 43 to compensate the displacement generated by the driving plate 211, so that the problem of mutual obstruction between the screw 45 and the connecting rod assembly 2 is avoided, the driving device 4 is protected, and the extension range of the connecting rod assembly 2 is further extended.

To sum up, the utility model discloses a roating seat 42 fixed mounting is on bottom plate 41, and worm gear device 43 together with motor 44 and screw rod 45 install the structure in roating seat 42 rotatoryly, under the condition that does not influence drive arrangement 4 joint strength, has compensatied the shortcoming among the prior art, has accomplished the utility model discloses a task, has realized the technical effect that the applicant carried the description in the above technical effect fence really.

Claims

1. The utility model provides a leg of car seat holds in palm drive arrangement, includes a pair of mounting panel (1) that sets up face to face, a pair of setting respectively on mounting panel (1) and one end with correspond side mounting panel (1) articulated link assembly (2) and one set up at two link assembly (2) other ends and through link assembly (2) leg support subassembly (3) that extend/draw in, its characterized in that: the leg support assembly comprises a mounting plate (1), a driving device (4) and a connecting rod assembly (2), wherein the inner side face of one mounting plate (1) is provided with the driving device (4), the driving device (4) comprises a base plate (41) fixed on the mounting plate (1), a rotating base (42) fixed on the base plate (41), a worm and gear device (43) rotationally arranged on the rotating base (42), a motor (44) in transmission connection with the worm and gear device (43) and a screw rod (45) in threaded connection with the worm and gear device (43) and capable of stretching back and forth, a driving beam (21) is formed between the two connecting rod assemblies (2), a driving plate (211) is fixed on the driving beam (21), and one end of the screw rod (45) is hinged to the driving plate (211) and pushes/pulls the connecting rod assembly (2) to enable the leg support assembly (3) to complete stretching/.

2. The leg rest driving device of the automobile seat according to claim 1, wherein a rotating seat cavity (421) is formed in the rotating seat (42) and penetrates left and right, a circular arc-shaped rotating groove (422) is formed in the front side surface of the rotating seat cavity (421) along the width direction, a front screw abdicating groove (423) is formed in the middle position of the rotating seat (42) along the height direction at the middle position of the rotating groove (422), a circular arc surface (424) is formed on the rear side surface of the rotating seat cavity (421), and a rear screw abdicating groove (425) is formed in the position of the circular arc surface (424) corresponding to the front screw abdicating groove (423); a pair of rotating support legs (4315) which are in running fit with the rotating grooves (422) are formed on the worm gear device (43), and one side surface of the worm gear device (43) is abutted against the arc surface (424) and slides up and down along the arc surface direction of the arc surface.

3. The leg rest driving device of an automobile seat according to claim 1, wherein the rotary seat (42) is formed with a set of limiting posts (426) on a side surface facing the bottom plate (41), and the rotary seat (42) is respectively provided with a rotary seat fixing screw hole (427) penetrating through the width direction thereof at a position near the limiting posts (426); the bottom plate (41) is provided with a limiting hole (411) and a fixing hole (412) at positions corresponding to the limiting column (426) and the rotating seat fixing screw hole (427), the rotating seat (42) is connected with the bottom plate (41) through a group of rotating seat fixing screws (429), and the rotating seat fixing screws (429) fix the bottom plate (41) and the rotating seat (42) after sequentially passing through the corresponding fixing hole (412) and the rotating seat fixing screw hole (427).

4. The leg rest driving device of the car seat as claimed in claim 1, wherein a mounting beam (11) is fixed between a pair of said mounting plates (1), a welding groove (413) matched with the mounting beam (11) is formed on one side of the base plate (41), a welding plate (414) is bent toward one side of the adjacent mounting plate (1) on the other side of the base plate (41), said welding groove (413) is fixed with the mounting beam (11), and said welding plate (414) is fixed with the corresponding mounting plate (1).

5. The leg rest driving device of an automobile seat according to claim 1, wherein the worm gear and worm device (43) comprises a worm gear seat (431) engaged with the rotary seat cavity (421), a worm gear (432), a worm (433) engaged with the worm gear (432), and a cover (434) sliding against the inner side of the rotary seat (42), a worm cavity (4311) extending inwards from the seat body is formed in the middle of the left side of the worm gear seat (431), a worm gear cavity (4312) penetrating through the worm gear seat (431) is formed backwards on the wall body below the worm cavity (4311), the worm gear (432) is arranged in the worm gear cavity (4312), a worm gear supporting shaft (4321) is respectively formed by narrowing the front and rear ends of the worm gear (432), worm gears (4321) at the front and rear ends are respectively provided with a worm gear bearing (4322), a step (4313) is formed on the wall body at the front side of the worm cavity (4311), wherein the worm gear bearing (4322) at the front end abuts against the step (4313), a bearing cavity (4341) is formed on one side surface of the sealing cover (434), the worm gear bearing (4322) at the rear end is embedded in the bearing cavity (4341), a worm gear screw hole (4323) penetrating through the worm gear (432) in the length direction is formed in the middle of the worm gear (432), a screw abdicating hole (4314) is formed in the position of the step (4313) corresponding to the worm gear screw hole (4323), a sealing cover screw abdicating hole (4342) is formed in the position corresponding to the worm gear (4323), the screw (45) is arranged in the screw abdicating hole (4314) and the sealing cover screw abdicating hole (4342) and is screwed with the worm gear screw hole (4323) in the middle of the worm gear (432), and the motor (44) is fixed on the left side surface 431 of the worm gear seat (431) penetrating through which is arranged, the motor (44) extends into the worm cavity (4311) to form a motor shaft (441), the motor shaft (441) is fixed with a worm (433), the worm (433) is positioned above the worm wheel (432) and meshed with the worm wheel and the worm wheel, a supporting seat (442) is arranged at one end part of the motor shaft (441) far away from the motor (44), and the supporting seat (442) is fixed on the worm wheel and worm rod seat (431) and sleeved with a sealing ring (443).

6. The leg rest driving apparatus of an automobile seat according to claim 5, wherein one end of the worm gear seat (431) extends out of the rotary seat chamber (421) of the rotary seat (42) and a motor bracket (4316) is formed on both front and rear sides of the extended end, the motor brackets (4316) are respectively provided with a motor fixing screw hole (43161), the motor (44) is respectively provided with a motor fixing plate (444) at the position of the two motor brackets (4316), the motor fixing plates (444) are respectively fixed with the corresponding motor fixing screw holes (43161) through a motor fixing screw (445), the rotary seat (42) is provided with a blocking foot (428) on the end surface of one side of the worm gear seat (431) extending out of the rotary seat cavity (421), and the blocking foot (428) is abutted against the bottom surface of the worm gear seat (431).

7. A leg rest driving device of a car seat as claimed in claim 1, wherein said screw rod (45) is formed with a joint (451) at one end portion toward the rear, the joint (451) is hinged with the driving plate (211) by a bolt (452), and the screw rod (45) is formed with a retaining ring (453) at a position located outside the rotary seat (42) near the rod body having one end of the joint (451).

8. The leg rest driving device of an automobile seat according to claim 1, wherein the link assembly (2) includes a power arm (22) having one end portion hinged to the mounting plate (1), a power arm link (23) stacked to intersect with the power arm (22) and having a middle portion hinged to each other, a fixed link (24) hinged to one end of the power arm link (23) and having the other end hinged to the mounting plate (1), a leg rest link (25) hinged to the other end of the power arm link (23), and a support link (26) having both ends hinged to the end portion of the power arm (22) and the middle portion of the leg rest link (25), respectively, the driving beam (21) is arranged between the two power arms (22) and close to one end hinged with the mounting plate (1), and the leg support assembly (3) is arranged on the leg support connecting rod (25).

9. The leg rest driving device of the car seat according to claim 1, wherein the leg rest assembly (3) comprises a pair of leg rest plates (31) and a pair of leg rest brackets (32), the two leg rest plates (31) are respectively arranged between the two leg rest connecting rods (25) at intervals, the two leg rest brackets (32) are respectively fixed on the leg rest connecting rods (25) at the corresponding sides and are opened outwards in a U-shaped manner, and the leg rest plates (31) and the leg rest brackets (32) are respectively fixed with the leg rest connecting rods (25).

10. A leg rest drive of a car seat according to claim 8, characterised in that a stiffening beam (261) is fixed between the two support links (26).