CN217705563U

CN217705563U - Vehicle seat back and cushion link gear

Info

Publication number: CN217705563U
Application number: CN202221983884.3U
Authority: CN
Inventors: 张会龙; 左家乐; 薛磊
Original assignee: Magna Seating Research and Development Chongqing Co Ltd
Current assignee: Magna Seating Research and Development Chongqing Co Ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2022-11-01
Anticipated expiration: 2032-07-29

Abstract

The utility model discloses a vehicle seat back and cushion link gear, including sitting frame, back, going up slide rail, first connecting piece, second connecting piece, third connecting piece and extension spring, the back can sit the frame relatively and rotate backward around first pin joint, the upper end of first connecting piece links to each other with the back is fixed, the lower extreme of first connecting piece is provided with two spouts round first pin joint circumference interval, the lower extreme at first connecting piece is articulated through second pin joint and the third pin joint point that is located corresponding spout in the rear end of second connecting piece, the rear end of third connecting piece articulates the lower extreme at the second connecting piece, the front end and the seat frame fixed connection of third connecting piece, the rear end of extension spring sets up on last slide rail, the front end slant of extension spring sets up on the third connecting piece. The problem of there is the step poor in cushion and back junction under the seat state of lying is solved, not only eliminate the V type contained angle between back and the cushion, can also realize the angle of back independent control simultaneously.

Description

Vehicle seat back and cushion link gear

Technical Field

The utility model belongs to the technical field of vehicle seat, especially, relate to a vehicle seat back and cushion link gear.

Background

Chinese patent CN114312499A discloses a lifting mechanism for a seat cushion of a vehicle seat, and particularly discloses that when a backrest rotates backwards around a second hinge point relative to a seat frame, a side plate of the backrest drives a first hinge point to move upwards through a first connecting piece, so that the height difference between the backrest and the seat cushion is eliminated when the seat is laid down. However, in the whole structure, when the backrest starts to rotate backwards, the cushion can be driven to move instantly, namely, from an initial state (normal sitting posture), the cushion can be lifted to different heights along with different backward rotation angles of the backrest, and the independent adjustment of the angle of the backrest cannot be realized (within a certain angle, the backrest rotates but the height of the cushion is unchanged); meanwhile, the seat frame cannot move downwards, so that the backrest cannot rotate forwards, and the seat frame cannot give way for the rear emptying room.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving seat and lying down the gesture (the back state of putting flat backward) cushion and back junction have the poor problem of step, make it not only eliminate the V type contained angle between back and the cushion, can also realize the angle individual adjustment of back simultaneously.

Therefore, the utility model discloses the technical scheme who adopts does: a vehicle seat backrest and cushion linkage mechanism comprises a seat frame, a backrest, an upper sliding rail, a first connecting piece, a second connecting piece, a third connecting piece and a tension spring, wherein the backrest can rotate backwards around a first hinge point relative to the seat frame, the upper end of the first connecting piece is fixedly connected with the backrest, the lower end of the first connecting piece is circumferentially provided with two sliding grooves at intervals around the first hinge point, the rear end of the second connecting piece is hinged at the lower end of the first connecting piece through a second hinge point and a third hinge point, the second hinge point and the third hinge point are respectively correspondingly positioned in the two sliding grooves on the first connecting piece, the rear end of the third connecting piece is hinged at the lower end of the second connecting piece through a fourth hinge point, the front end of the third connecting piece is fixedly connected with the seat frame, the rear end of the tension spring is arranged on the upper sliding rail, and the front end of the tension spring is obliquely arranged on the third connecting piece upwards;

the tension spring is in an initial tension state, when in the lying state, the second hinge point and the third hinge point are in contact with the rear inner wall of the corresponding sliding chute, and have a certain tension amount relative to the initial tension state; when the backrest rotates backwards from the initial state to the rear idle stroke critical state, the process is the rear idle stroke stage, when the backrest rotates from the rear idle stroke critical state to the lying state, the process is the lifting stage, and when the backrest rotates from the initial state to the front idle stroke critical state, the process is the front idle stroke stage.

Preferably, the third connecting part comprises a seat frame supporting frame, a seat basin connecting support and a seat frame suspension spring connecting support, the rear end of the seat frame supporting frame is hinged to the lower end of the second connecting part through a fourth hinge point, the upper end of the seat basin connecting support is hinged to the rear end of the seat basin, the lower end of the seat basin connecting support is hinged to the front end of the seat frame supporting frame, the front end of the seat frame suspension spring connecting support is fixed to the middle and rear position of the seat frame supporting frame, the rear end of the seat frame suspension spring connecting support is fixed to the seat frame suspension spring hanging plate, and the front end of the tension spring is arranged on the seat frame supporting frame.

Preferably, the third connecting piece comprises a seat frame supporting frame, a seat basin connecting support and a seat frame suspension spring connecting support, the upper end of the seat basin connecting support is hinged to the rear end of the seat basin, the lower end of the seat basin connecting support is bent inwards at a right angle to form a shape like '12579', the horizontal section of the third connecting piece is fixedly arranged at the position, close to the front, in the middle of the seat frame supporting frame, the front end of the tension spring is arranged on the seat basin connecting support, the front end of the seat frame suspension spring connecting support is fixedly arranged at the middle rear position of the seat frame supporting frame, the rear end of the seat frame suspension spring connecting support is fixedly arranged on a seat frame suspension spring connecting plate, the rear end of the seat frame supporting frame is hinged to the lower end of the second connecting piece through a fourth hinge joint, a cushion plate is fixedly arranged below the front end of the seat frame, a transverse rod extending left and right is arranged on the rear side of the cushion plate, and the front end of the seat frame supporting frame is arranged on the transverse rod. Make and sit that the frame is whole and can upwards lift along with the lying of back, make and sit the frame under the flat state of lying, whole horizontal state that is in and is lifted not only eliminates the V type contained angle between back and the cushion, still keeps whole cushion to be in the horizontal state, prevents to be in the tilt state at ordinary times of lying to promote passenger's the experience of taking.

Preferably, a seat frame front end angle adjusting mechanism used for adjusting the seat frame front end angle is arranged below the seat frame front end and comprises an adjusting motor, a screw-nut assembly and a front end angle adjusting rod, the adjusting motor is arranged on an adjusting motor support fixedly arranged on a seat frame side plate, the adjusting motor drives a nut of the screw-nut assembly to rotate so as to enable a screw rod of the screw-nut assembly to move back and forth, the front end of the screw rod of the screw-nut assembly is hinged to the lower end of the front end angle adjusting rod, the upper end of the front end angle adjusting rod is bent backwards and integrally to be in an L shape, the corner of the front end angle adjusting rod is hinged to the bottom of the front end through a sliding pair, and the upper end of the front end angle adjusting rod is hinged to the seat frame side plate. The seat frame integrally rotates around the front end to realize angle adjustment through the motor and the screw rod nut mechanism, and the seat frame is compact in structure, small in occupied space and easy to arrange. Sit frame front end angle adjustment mechanism and link gear cooperation and use, make it can make through link gear and sit the frame rear end and lift up at ordinary times at the back, make through sitting frame front end angle adjustment mechanism simultaneously and sit the frame front end and lift up to keep whole seat frame in the horizontality, prevent that the cushion is in the tilt state at ordinary times of lying, thereby promote passenger's the experience of taking.

Preferably, a seat frame sliding block is arranged at the bottom of the front end of the seat frame, a sliding groove extending forwards and backwards is formed in the seat frame sliding block, the front end angle adjusting rods on the left side and the right side are connected through a front rotating shaft, and the front rotating shaft is inserted into the sliding groove to form a sliding pair hinge.

For preventing the second connecting piece from impacting the rear transverse pipe at the rear side of the seat frame during movement, the second connecting piece is fixedly provided with the plastic clamping ring which can be clamped on the rear transverse pipe of the seat frame, the rear transverse pipe of the seat frame can be effectively protected, and abnormal sound and vibration can be reduced.

For simplifying the structure, be convenient for make and install and arrange, sit frame support frame whole and be rectangular form, and both ends around dividing into, the anterior segment flushes with sitting the frame, and the relative anterior segment of back end is bent downwards, sit frame suspension spring linking bridge and set up on the back end, sit basin linking bridge and set up on the anterior segment.

For simplifying the structure, be convenient for make and install and arrange, first connecting piece and second connecting piece are the panel beating stamping workpiece, first connecting piece welding is on the back bottom plate of back.

In order to facilitate manufacturing and installation arrangement, the seat frame sliding block comprises a sliding block seat and a sliding block cover plate arranged below the sliding block seat, the middle of the sliding block cover plate is sunken downwards, and the sliding groove is formed by a sunken part in the middle of the sliding block cover plate and the lower side surface of the sliding block seat.

The utility model has the advantages that:

(1) The sliding groove is formed in the first connecting piece, so that the backrest has a certain amount of idle stroke when rotating, and the backrest can be independently adjusted within a certain angle.

(2) Because when initial condition, second pin joint and third pin joint are located corresponding spout middle part position department for the back can realize backward independent control, also can realize forward independent control.

(3) The interval is provided with two spouts on first connecting piece, and two pin joints that lie in two spouts through corresponding between first connecting piece and the second connecting piece are articulated simultaneously, and it can further inject the second connecting piece, and the lower extreme that can effectively prevent the second connecting piece from only round the fourth pin joint pivoted condition to guarantee that the third connecting piece can drive the ascending lifting of cushion rear end.

(4) A tension spring is arranged between the upper slide rail and the third connecting piece, and the tension spring enables the second hinge point and the third hinge point to keep an initial state under the condition of no external force during a rear idle stroke stage and a front idle stroke stage; when the lifting stage is carried out, the tension spring is used for keeping the second connecting piece and the first connecting piece to be a whole, so that the first connecting piece can drive the second connecting piece to move together.

Drawings

Fig. 1 is a first schematic structural diagram (when the third connecting member is in the second state) of the present invention.

Fig. 2 is a bottom view of fig. 1.

Fig. 3 is a second schematic structural diagram (when the third connecting member is in the first state) of the present invention.

Fig. 4 is a bottom view of fig. 3.

Initial state, rear idle stroke critical state, lying state and front idle stroke critical state

Fig. 5 is a partial schematic view (in an initial state) of the first connecting member according to the present invention.

Fig. 6 is a partial schematic view of a first connecting member according to the present invention (in a rear idle stroke critical state).

Fig. 7 is a partial schematic view of the first connecting member according to the present invention (in the critical state of forward idle stroke).

Fig. 8 is a partial schematic view of the first connecting member of the present invention (in a lying state).

Fig. 9 is the mechanical movement diagram of fig. 1 (the third link is in the second state and the whole is in the initial state).

Fig. 10 is a second simplified mechanical movement diagram of fig. 1 (the third link is in a second state and is generally in a rear idle stroke threshold state).

Fig. 11 is a third simplified mechanical movement diagram of fig. 1 (the third link is in the second state, and the entire body is in the initial state and in the flat state).

Fig. 12 is a fourth simplified mechanical movement diagram of fig. 1 (the third link is in the second state and is in the forward idle stroke threshold state as a whole).

Fig. 13 is a mechanical movement diagram of fig. 3 (the third link is in the first state and the whole is in the initial state).

Detailed Description

The invention is further illustrated by the following examples in combination with the accompanying drawings:

referring to fig. 1 to 13, a vehicle seat backrest and cushion linkage mechanism mainly comprises a seat frame 1, a backrest 2, an upper slide rail 3, a seat frame side plate 4, a seat frame suspension spring hanging plate 5, a first connecting piece 6, a second connecting piece 7, a third connecting piece 8 and a tension spring 9. Wherein, the seat frame 1, the backrest 2, the upper sliding rail 3 and the seat frame side plate 4 are original parts on the automobile seat.

The seat frame 1 is arranged between two seat frame side plates 4 at left and right intervals, an upper sliding rail 3 capable of driving the whole seat to move back and forth is arranged below the seat frame side plates 4, the seat frame 1 comprises a seat basin 1a and a seat frame suspension spring 1b which are arranged front and back, the front end of the seat frame suspension spring 1b is connected to the rear end of the seat basin 1a in a hanging mode, and the rear end of the seat frame suspension spring 1b is connected to a seat frame suspension spring connecting plate 5 in a hanging mode. The backrest 2 comprises two backrest side plates 2a arranged at left and right intervals and a backrest bottom plate 2b arranged between the backrest side plates 2a, and the backrest side plates 2a are hinged with the seat frame side plate 4 through a first hinge point A. The above is the prior art, and is not described herein again.

The problem of step difference at the joint of the cushion and the backrest when the backrest is turned over and laid flat is solved; and simultaneously the backrest can be independently adjusted when rotating. Also adds: a first connecting piece 6, a second connecting piece 7, a third connecting piece 8 and a tension spring 9.

The upper end of the first connecting piece 6 is fixedly connected with the backrest bottom plate 2b on the backrest 2, and the lower end of the first connecting piece 6 is provided with two arc-shaped sliding grooves 6a at intervals around the first hinge point A in the circumferential direction. The rear end of the second connecting piece 7 is hinged at the lower end of the first connecting piece 6 through a second hinge point B and a third hinge point C, and the second hinge point B and the third hinge point C are respectively and correspondingly positioned in the two sliding grooves 6a on the first connecting piece 6. The rear end of the third connecting piece 8 is hinged at the lower end of the second connecting piece 7 through a fourth hinge point D, and the front end of the third connecting piece 8 is fixedly connected with the seat frame 1. The rear end of the tension spring 9 is arranged on the upper slide rail 3, and the front end of the tension spring 9 is obliquely and upwards arranged on the third connecting piece 8. In order to keep the stable movement of the whole seat, the first connecting piece 6, the second connecting piece 7, the third connecting piece 8 and the tension spring 9 are arranged at the left side and the right side at intervals.

In the initial state, the second hinge point B and the third hinge point C are located at the middle position of the corresponding slide groove 6a, and the tension spring 9 is in the initial tension state. When the backrest 2 rotates backwards around the first hinge point a relative to the seat frame 1, the backrest 2 drives the first connecting piece 6 to rotate, when the backrest 2 starts to rotate backwards, the sliding groove 6a rotates forwards relative to the second hinge point B and the third hinge point C, the second connecting piece 7 does not move, and the process is a back idle stroke stage. When the second hinge point B and the third hinge point C are just in contact with the rear inner wall of the corresponding chute 6a, respectively, and the tension spring 9 is in an initial tension state, which is a rear idle stroke critical state at this time. When the backrest 2 continues to rotate backwards, the rear side wall of the sliding groove 6a correspondingly presses the second hinge point B and the third hinge point C to drive the second connecting piece 7 to move upwards, so that the rear end of the seat frame 1 is lifted upwards, and the process is a lifting stage. When the backrest 2 continues to rotate backwards by a certain angle, the whole seat can achieve a lying posture, the backrest 2 and the rear end of the cushion have no step difference, and the backrest and the cushion are in a horizontal state, the whole seat is in the lying state at the moment, and the tension spring 9 has a certain tension amount relative to the initial tension state.

When the backrest 2 rotates forwards and returns to the original position from the lying state, the backrest 2 drives the first connecting piece 6 to rotate, the second hinge point B and the third hinge point C are in contact with the rear side wall of the sliding groove 6a when the second connecting piece 7 is under the action of the tension spring 9, the second connecting piece 7 is driven to move downwards until the whole seat returns to the rear idle stroke critical state, when the backrest 2 continues to rotate forwards, the second connecting piece 7 returns to the initial position under the action of the tension spring and then keeps still, and at the moment, the backrest is adjusted forwards independently.

When the backrest 2 moves forward around the first hinge point a relative to the seat frame 1, the backrest 2 drives the first connecting piece 6 to rotate, the sliding groove rotates backward relative to the second hinge point B and the third hinge point C within a certain angle of forward rotation of the backrest 2, the second connecting piece 7 does not move, and the process is a forward idle stroke stage. When the second hinge point B and the third hinge point C are just in contact with the front inner wall of the corresponding chute 6a, respectively, and the tension spring 9 is in an initial tension state, which is a critical state of the front idle stroke.

In order to ensure that the inclination angle of the seat cushion reaches the level when the automobile seat is in a lying state, a seat frame front end angle adjusting mechanism used for adjusting the front end angle of the seat frame 1 is arranged below the front end of the seat frame 1. The concrete structure of the seat frame front end angle adjusting mechanism comprises an adjusting motor 10, a screw-nut component 11 and a front end angle adjusting rod 12, wherein the adjusting motor 10 is arranged on an adjusting motor support 13 fixedly arranged on a seat frame side plate 4, the output end of the adjusting motor 10 is rotatably connected with a nut of the screw-nut component, namely, the adjusting motor 10 drives the nut of the screw-nut component 11 to rotate so as to enable a screw rod of the screw-nut component 11 to move back and forth, the front end of the screw rod of the screw-nut component 11 is hinged to the lower end of the front end angle adjusting rod 12, the upper end of the front end angle adjusting rod 12 is bent backwards to be integrally in an L shape, the corner of the front end angle adjusting rod 12 is hinged to the bottom of the front end through a sliding pair E, and the upper end of the front end angle adjusting rod 12 is hinged to the seat frame side plate 4. In order to ensure that the front end of the seat frame can be lifted integrally, the two front-end angle adjusting rods 12 are arranged at the left and right sides at intervals, in order to simplify the structure and facilitate arrangement, the adjusting motor 10 and the screw nut assembly 11 are only provided with one group, the lower end of one front-end angle adjusting rod 12 is hinged with a screw rod of the screw nut assembly 11, the other front-end angle adjusting rod 12 only comprises a horizontal section, the front end of the horizontal section is hinged with a sliding pair E, and the rear end of the horizontal section is hinged with a seat frame side plate 4.

Preferably, a seat frame sliding block 14 is arranged at the bottom of the front end of the seat frame 1, a sliding groove 14a extending forwards and backwards is formed in the seat frame sliding block 14, the front end angle adjusting rods 12 on the left side and the right side are connected through a front rotating shaft 15, the front rotating shaft 15 is made of a circular tube, and the front rotating shaft 15 penetrates through the sliding groove 14a to form a sliding pair E hinge.

When the backrest 2 rotates backwards around the first hinge point A relative to the seat frame 1 and is placed normally, the upward lifting height of the rear end of the seat frame 1 can be adjusted by adjusting the hinged positions of the first connecting piece and the second connecting piece, the hinged positions of the second connecting piece and the third connecting piece, the lengths of the first connecting piece and the second connecting piece and the like, the height adjusting range of the rear end of the seat frame is 50-150 mm (can be adjusted according to different requirements), and the requirement of the seat for lying and leveling can be met. The angle range of the backrest which is independently adjusted can be changed by adjusting the angle of the arc of the sliding chute. According to actual requirements, the angle of the backrest which is independently adjusted is between-30 degrees and 30 degrees, namely the backrest can be adjusted forwards by 30 degrees and can also be adjusted backwards by 30 degrees.

In order to prevent the backrest and the cushion from being linked, the second connecting piece 7 directly impacts the rear transverse tube 16 of the seat frame, and a plastic snap ring 17 which can be clamped on the rear transverse tube 16 of the seat frame is fixedly arranged on the second connecting piece 7.

The first connecting piece 6 and the second connecting piece 7 are both sheet metal stamping parts, and the first connecting piece 6 is welded on the backrest bottom plate 2b of the backrest 2, so that the processing and the manufacturing are convenient. The front end angle adjusting rod 12 is also a sheet metal part, is wide at the top and narrow at the bottom, is provided with an arc notch at the top end, and is welded on the front rotating shaft 15 through the arc notch.

In this embodiment, the third connecting member has two states, one of which is that the third connecting member is hinged to the rear end of the seat frame, and only drives the rear end of the cushion to lift up at the same time during the lifting-up stage. The other state is that the third connecting piece is hinged with the middle part of the seat frame, and when the lifting stage is carried out, the whole cushion can be driven to be lifted upwards, so that the inclination angle of the cushion is kept horizontal.

During the first kind of state, as shown in fig. 3 and fig. 4, third connecting piece 8 includes frame support frame 8a, sit basin linking bridge 8b and frame suspension spring linking bridge 8c, the rear end of frame support frame 8a articulates the lower extreme at second connecting piece 7 through fourth pin joint D, the upper end of seat basin linking bridge 8b articulates the rear end at seat 1a, the lower extreme of seat basin linking bridge 8b articulates the front end at frame support frame 8a, the front end of frame suspension spring linking bridge 8c is fixed in the well rear position department of frame support frame 8a, the rear end of frame suspension spring linking bridge 8c is fixed on frame suspension spring fishplate bar 5, the front end of extension spring 9 sets up on frame support frame 8 a. At the moment, the linkage mechanism is matched with the seat frame front end angle adjusting mechanism for use, so that the front end and the rear end of the seat frame are both lifted, and the cushion can be kept in a horizontal state.

In a second state, as shown in fig. 1 and 2, the third connecting member includes a seat frame support frame 8a, a seat basin connecting support frame 8b and a seat frame suspension spring connecting support frame 8c, the upper end of the seat basin connecting support frame 8b is hinged to the rear end of the seat basin 1a, the lower end of the seat basin connecting support frame 8b is bent inwards at a right angle to form a shape of '12579', the horizontal section is fixedly arranged at a position near the front of the middle part of the seat frame support frame 8a, and the front end of the tension spring 9 is arranged at the lower end of the seat basin connecting support frame 8 b. The front end of the seat frame suspension spring connecting support 8c is fixed at the middle and rear position of the seat frame supporting frame 8a, and the rear end of the seat frame suspension spring connecting support 8c is fixed on the seat frame suspension spring hanging plate 5. A base plate 18 is fixedly arranged below the front end of the seat frame 1, a cross rod 19 extending left and right is arranged on the rear side of the base plate 18, the front ends of the seat frame support frames 8a on the two sides are arranged at the left end and the right end of the cross rod 19, and the rear end of the seat frame support frame 8a is hinged to the lower end of the second connecting piece 7 through a fourth hinge point D. During the lifting stage, the whole seat frame can be lifted, so that the seat cushion is kept in a horizontal state. The linkage mechanism and the seat frame front end angle adjusting mechanism in the state can be independently adjusted and can also be adjusted in a matched mode.

When the second state, for reducing occupation space, seat frame support frame 8a wholly is rectangular form, and divide into both ends around, and the anterior segment flushes with the seat frame, and the relative anterior segment of back end is bent downwards, and seat frame suspension spring linking bridge 8c sets up on the back end, and seat basin linking bridge 8b sets up on the anterior segment.

Claims

1. The utility model provides a vehicle seat back and cushion link gear, includes sits frame (1), back (2) and goes up slide rail (3), back (2) can sit frame (1) relatively and rotate its characterized in that around first pin joint (A) backward: the backrest seat is characterized by further comprising a first connecting piece (6), a second connecting piece (7), a third connecting piece (8) and a tension spring (9), wherein the upper end of the first connecting piece (6) is fixedly connected with the backrest (2), the lower end of the first connecting piece (6) is provided with two sliding grooves (6 a) at intervals in the circumferential direction around a first hinge point (A), the rear end of the second connecting piece (7) is hinged to the lower end of the first connecting piece (6) through a second hinge point (B) and a third hinge point (C), the second hinge point (B) and the third hinge point (C) correspond to the two sliding grooves (6 a) on the first connecting piece (6) respectively, the rear end of the third connecting piece (8) is hinged to the lower end of the second connecting piece (7) through a fourth hinge point (D), the front end of the third connecting piece (8) is fixedly connected with the seat frame (1), the rear end of the tension spring (9) is arranged on the upper sliding rail (3), and the front end of the tension spring (9) is arranged on the third connecting piece (8) in an upward direction;

the rear idle stroke critical state is characterized by further comprising an initial state, a rear idle stroke critical state, a lying state and a front idle stroke critical state, wherein in the initial state, the second hinge point (B) and the third hinge point (C) are located at the middle position of the corresponding sliding chute (6 a), the tension spring (9) is in an initial stretching state, in the rear idle stroke critical state, the second hinge point (B) and the third hinge point (C) are in contact with the rear inner wall of the corresponding sliding chute (6 a), the tension spring (9) is in an initial stretching state, in the lying state, the second hinge point (B) and the third hinge point (C) are in contact with the rear inner wall of the corresponding sliding chute (6 a), the tension spring (9) has stretching amount relative to the initial stretching state, in the front idle stroke critical state, the second hinge point (B) and the third hinge point (C) are in contact with the front inner wall of the corresponding sliding chute (6 a), and the tension spring (9) is in the initial stretching state.

2. A vehicle seat back and cushion linkage according to claim 1, wherein: the third connecting piece (8) comprises a seat frame supporting frame (8 a), a seat basin connecting support (8 b) and a seat frame suspension spring connecting support (8 c), the rear end of the seat frame supporting frame (8 a) is hinged to the lower end of the second connecting piece (7) through a fourth hinge point (D), the upper end of the seat basin connecting support (8 b) is hinged to the rear end of the seat basin (1 a), the lower end of the seat basin connecting support (8 b) is hinged to the front end of the seat frame supporting frame (8 a), the front end of the seat frame suspension spring connecting support (8 c) is fixed to the middle and rear positions of the seat frame supporting frame (8 a), the rear end of the seat frame suspension spring connecting support (8 c) is fixed to a seat frame suspension spring connecting plate (5), and the front end of a tension spring (9) is arranged on the seat frame supporting frame (8 a).

3. A vehicle seat back and cushion linkage according to claim 1, wherein: the third connecting piece comprises a seat frame supporting frame (8 a), a seat basin connecting support (8 b) and a seat frame suspension spring connecting support (8 c), the upper end of the seat basin connecting support (8 b) is hinged to the rear end of the seat basin (1 a), the lower end of the seat basin connecting support (8 b) is bent inwards at a right angle to form a shape of '1257979', a horizontal section of the lower end of the seat basin connecting support is fixedly arranged at a position, close to the front, in the middle of the seat frame supporting frame (8 a), the front end of a tension spring (9) is arranged on the seat basin connecting support (8 b), the front end of the seat frame suspension spring connecting support (8 c) is fixedly arranged at the middle rear position of the seat frame supporting frame (8 a), the rear end of the seat frame suspension spring connecting support (8 c) is fixedly arranged on the seat frame suspension spring connecting plate (5), the rear end of the seat frame supporting frame (8 a) is hinged to the lower end of the second connecting piece (7) through a fourth hinge point (D), a cushion plate (18) is fixedly arranged below the front end of the seat frame (1), and a transverse rod (19) extending from the left side to the right side is arranged on the seat frame suspension spring supporting frame (8 a) and is arranged on the seat frame supporting frame (19).

4. A vehicle seat back and cushion linkage according to claim 1, wherein: the angle adjusting mechanism is characterized in that a seat frame front end angle adjusting mechanism used for adjusting the front end angle of the seat frame (1) is arranged below the front end of the seat frame (1), the seat frame front end angle adjusting mechanism comprises an adjusting motor (10), a screw nut assembly (11) and a front end angle adjusting rod (12), the adjusting motor (10) is arranged on an adjusting motor support (13) fixedly arranged on a seat frame side plate (4), the adjusting motor (10) enables a screw rod of the screw nut assembly (11) to move back and forth by driving a nut of the screw nut assembly (11) to rotate, the front end of the screw rod of the screw nut assembly (11) is hinged to the lower end of the front end angle adjusting rod (12), the upper end of the front end angle adjusting rod (12) is bent backwards to be L-shaped as a whole, the corner of the front end angle adjusting rod (12) is hinged to the bottom of the front end through a sliding pair (E), and the upper end of the front end angle adjusting rod (12) is hinged to the seat frame side plate (4).

5. A vehicle seat back and cushion linkage according to claim 4, wherein: the front end bottom of sitting frame (1) is provided with sits frame slider (14), sit sliding tray (14 a) that the front and back extends of having seted up in frame slider (14), the front end angle adjusting lever (12) of the left and right sides links to each other through preceding pivot (15), preceding pivot (15) alternate constitute sliding pair (E) in sliding tray (14 a) and articulate.

6. A vehicle seat back and cushion linkage according to claim 1, wherein: and the second connecting piece (7) is fixedly provided with a plastic snap ring (17) which can be clamped on the rear transverse pipe (16) of the seat frame.

7. A vehicle seat back and cushion linkage according to claim 3, wherein: sit frame support frame (8 a) whole and be rectangular form, and divide into both ends around, the anterior segment flushes with sitting the frame, and the relative anterior segment of back end is bent downwards, sit frame suspension spring linking bridge (8 c) and set up on the back end, sit basin linking bridge (8 b) and set up on the anterior segment.

8. A vehicle seat back and cushion linkage according to claim 1, wherein: first connecting piece (6) and second connecting piece (7) are the sheet metal stamping spare, first connecting piece (6) welding is on back bottom plate (2 b) of back (2).

9. A vehicle seat back and cushion linkage according to claim 5, wherein: the seat frame sliding block (14) comprises a sliding block seat (14 b) and a sliding block cover plate (14 c) arranged below the sliding block seat (14 b), the middle of the sliding block cover plate (14 c) is sunken downwards, and the sliding groove (14 a) is formed by the middle of the sliding block cover plate (14 c) and the lower side surface of the sliding block seat (14 b).