CN107933381B

CN107933381B - Seat height adjusting device and seat

Info

Publication number: CN107933381B
Application number: CN201711321048.2A
Authority: CN
Inventors: 李娟�; 黄英钢; 陈明
Original assignee: Hubei Aviation Precision Machinery Technology Co Ltd
Current assignee: Hubei Aviation Precision Machinery Technology Co Ltd
Priority date: 2017-12-12
Filing date: 2017-12-12
Publication date: 2023-09-15
Anticipated expiration: 2037-12-12
Also published as: CN107933381A

Abstract

The invention discloses a seat height adjusting device and a seat, wherein the height adjusting device comprises a height adjuster and a four-bar mechanism for adjusting the height of the seat, and the height adjuster is provided with a driving gear; the height adjusting device further comprises a connecting rod part, the connecting rod part comprises a tooth part which can be meshed with the driving gear, and one end of the connecting rod part is hinged to the four-bar mechanism so as to drive the four-bar mechanism to lift. According to the scheme, on one hand, the number of the rotary joints is reduced, only one rotary joint is arranged, the production and assembly process is simpler, the efficiency can be saved, and the running reliability can be improved; in addition, due to the reduction of the number of the rotary joints, when the connecting rod part drives the four-bar mechanism to act, the four-bar mechanism is easier to realize, and excessive Z-direction (vertical direction) spaciousness is not needed.

Description

Seat height adjusting device and seat

Technical Field

The invention relates to the technical field of seats, in particular to a seat height adjusting device and a seat.

Background

The automobile seat can be adjusted in height by the height adjusting device according to the requirements of drivers.

Referring to fig. 1, fig. 1 is an assembly view of a seat height adjusting mechanism; fig. 2 is a partial enlarged view of the I-site in fig. 1.

The main body part of the seat adjusting mechanism is a four-bar mechanism and is a seat cushion framework of the seat, and the seat cushion of the seat is positioned above the four-bar mechanism. The four-bar mechanism comprises a seat frame side plate 04 and a slide rail connecting plate which are arranged up and down, and a rear transmission rod 07 and a front transmission rod which are positioned at the left side and the right side (the left side, the right side, the upper side, the lower side and the right side take the view of fig. 1 as views). The four-bar mechanism is arranged on the left side and the right side of the steering wheel in the driving direction and is linked together.

The outer side of the four-bar mechanism on one side is provided with a high adjuster, the high adjuster is provided with a pinion 01, the pinion 01 is positioned on the inner side of the seat frame side plate 04, the high adjuster is fixed on the seat frame side plate 04 through three bolts 09, and the three bolts 09 are inserted into the seat frame side plate 04 and are screwed on the support plate 10 on the inner side.

The inside of the seat frame side plate 04 is also provided with a toothed plate 02 and a connecting rod 05, the toothed plate 02 is hinged to the seat frame side plate 04 through a first step screw 03, one end of the connecting rod 05 is hinged to the toothed plate 02 through a rivet 06, and the other end of the connecting rod 05 is hinged to a rear transmission rod 07 through a second step screw 08. The toothed plate 02 and the rear transmission rod 07 are respectively riveted with a first self-lubricating bearing sleeve 11 and a second self-lubricating bearing sleeve 12, and are matched with a first step screw 03 and a second step screw 08, so that the rotation friction is reduced. As shown in fig. 1, the toothed plate 02 has a fan shape, and the toothed plate 02 is provided with an arc-shaped hole through which a bolt 09 passes so as not to interfere with the rotation of the toothed plate 02.

The height adjusting process of the height adjusting mechanism is as follows:

when the high adjuster is operated, the pinion 01 rotates, the pinion 01 drives the toothed plate 02 meshed with the pinion to rotate, the toothed plate 02 rotates to drive the connecting rod 05 to swing, the connecting rod 05 drives the rear transmission rod 07 to act, then the height of the whole four-bar mechanism changes along with the movement, and the height of the seat is adjusted.

With continued reference to fig. 3, fig. 3 is a schematic diagram of the height adjustment structure of fig. 1.

Wherein, AC refers to a slide rail connecting plate, ABE refers to a rear transmission rod, BGD refers to a seat frame side plate 04, cd refers to a front transmission rod, G point is a hinge point (a position of a first step screw 03) of the toothed plate 02 rotating around the seat frame side plate 04, H is a rotation point of the pinion 01, F is a hinge point (a position of a rivet 06) of the connecting rod 05 and the toothed plate 02, and E is a hinge point (a position of a second step screw 08) of the connecting rod 05 and the rear transmission rod 07.

The height adjusting mechanism has the following technical problems:

the number of the rotating joints is large, as shown in fig. 3, the high-speed regulator drives the four-bar mechanism to comprise three rotating joints (G, F, E respectively), so that the process control points are too many, and the difficulty of processing and assembling is also high;

moreover, when the number of the rotating joints is large, a certain gap exists at each rotating joint, so that the more the rotating joints are, the larger the gap which can be released by the whole connecting rod mechanism is, and therefore the Z-direction spaciousness of the cushion framework is larger, and the riding comfort is affected.

Disclosure of Invention

In order to solve the above problems, the present invention provides a seat height adjusting device and a seat, in which the number of rotational joints is small.

The invention provides a seat height adjusting device, which comprises a high adjuster and a four-bar mechanism for adjusting the height of a seat, wherein the high adjuster is provided with a driving gear; the height adjusting device further comprises a connecting rod part, the connecting rod part comprises a tooth part which can be meshed with the driving gear, and one end of the connecting rod part is hinged to the four-bar mechanism so as to drive the four-bar mechanism to lift.

According to the scheme, the high adjuster is operated, the driving gear rotates, the tooth part of the connecting rod part is matched with the tooth part of the driving gear, the distance between the hinge points of the connecting rod part and the four-bar mechanism and the position point of the driving gear can be changed, the four-bar mechanism is driven to act, and the height of the seat can be changed in a lifting way.

Therefore, according to the scheme, on one hand, the number of the rotary joints is reduced, only one rotary joint is arranged, the production and assembly process is simpler, the efficiency can be saved, and the running reliability can be improved; in addition, due to the reduction of the number of the rotary joints, the releasable clearance is reduced, so that the Z-direction (vertical direction) clearance can be reduced, and the riding comfort is improved.

Optionally, the connecting rod portion includes connecting rod and rack that can dismantle the connection, tooth portion is the tooth portion of rack, the one end of connecting rod articulates in four bar linkage.

The rack is fixed in the connecting rod, and the stroke direction of the two is unanimous, like this, when facing the cushion skeleton and there is different stroke demands, as long as change the connecting rod can, the rack need not to change. Therefore, the rack can be used as a general part, so that the development cost of the product is reduced.

Optionally, the link is hinged to the bottom of the four-bar linkage.

Optionally, a sliding rail for driving the seat to move back and forth is arranged below the seat, and the sliding rail is the bottom of the four-bar mechanism; the sliding rail is provided with a sliding rail connecting plate, and the connecting rod is hinged to the sliding rail connecting plate.

Optionally, the connecting rod comprises a connecting section and a rack section which are integrally connected, and the connecting section and the rack section form a preset included angle; the connecting section is hinged to the bottom of the four-bar mechanism, and the rack section is fixed with the rack.

Optionally, the connecting rod is provided with a long groove, the rack is located in the long groove, and the tooth part of the rack extends out of the notch of the long groove to be meshed with the driving gear.

Optionally, the height adjuster is fixed on a seat frame side plate of the four-bar mechanism through a plurality of bolts; the connecting rod is positioned between one of the bolts and the driving gear, and the bolt is a first bolt.

Optionally, a noise reduction sleeve is sleeved outside the first bolt, and the noise reduction sleeve is in contact with the connecting rod.

Optionally, a shaft sleeve is fixed on the inner side of the seat frame side plate, the first bolt penetrates through the shaft sleeve, and the noise reduction sleeve is sleeved outside the shaft sleeve.

Optionally, the connecting rod is provided with a front protrusion and a rear protrusion along the length direction, and can be abutted against the first bolt.

Optionally, the seat frame comprises a seat frame side plate, a seat frame body and a seat frame body, wherein the seat frame side plate is provided with a seat frame body, the seat frame body is provided with a seat frame side plate, and the seat frame side plate is provided with a seat frame body; the connecting rod is positioned between the seat frame side plate and the supporting plate.

Optionally, the support plate is provided with a protrusion to contact a surface of the connecting rod facing the support plate.

The invention also provides a seat, which comprises a height adjusting device and a seat cushion arranged on the height adjusting device, wherein the height adjusting device is the seat height adjusting device. Since the seat height adjusting device has the above technical effects, the seat also has the same technical effects.

Drawings

FIG. 1 is an assembly view of a seat height adjustment mechanism;

FIG. 2 is an enlarged view of part of the region I in FIG. 1;

FIG. 3 is a schematic view of the height adjustment structure of FIG. 1;

FIG. 4 is a schematic view of a seat height adjusting device according to an embodiment of the present invention;

FIG. 5 is an enlarged schematic view of a portion I of FIG. 4;

FIG. 6 is an exploded view of FIG. 4;

FIG. 7 is a schematic view of the assembled connecting rod and rack of FIG. 4;

FIG. 8 is a cross-sectional view taken along line A-A of FIG. 7;

FIG. 9 is a schematic view of the assembly of the connecting rod and rack of FIG. 7;

FIG. 10 is a schematic view of the height adjustment device of FIG. 4;

fig. 11 is a schematic view of the support plate of fig. 6.

The reference numerals in fig. 1-3 are as follows:

the gear comprises a pinion, a toothed plate 02, a first step screw 03, a seat frame side plate 04, a connecting rod 05, a rivet 06, a rear transmission rod 07, a second step screw 08, a bolt 09, a supporting plate 10, a first self-lubricating bearing sleeve 11 and a second self-lubricating bearing sleeve 12;

the reference numerals in fig. 4-11 are as follows:

the device comprises a 101 seat frame side plate, a 101a first bolt hole, a 101b second bolt hole, a 102 rear transmission rod, a 103 sliding rail, a 103a sliding rail connecting plate, a 104 front transmission rod, a 20 connecting rod, a 201 long groove, a 202 surface, a 20a front bulge, a 20b rear bulge, a 1a first fastener, a 1b second fastener, a 30 supporting plate, a 301 half punching boss, a 302 first bolt hole, a 303 second bolt hole, a 304 third bolt hole, a 40 linkage rod, a 50 shaft sleeve, a 60 high adjuster, a 601 driving gear, a 602 mounting plate, a 60a first bolt, a 60b second bolt, a 60c third bolt, a 70 noise reduction sleeve and an 80 rack.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 4, fig. 4 is a schematic structural view of an embodiment of a seat height adjusting device according to the present invention; FIG. 5 is an enlarged schematic view of a portion I of FIG. 4; fig. 6 is an exploded view of fig. 4.

As shown in fig. 4 to 6, the height adjusting device of the seat comprises a height adjuster 60 and a four-bar mechanism for adjusting the height of the seat, wherein the four-bar mechanism is used as a framework of a seat cushion to realize the up-down height adjustment of the seat. The four-bar linkage specifically includes a front transmission rod 104, a rear transmission rod 102, and a seat frame side plate 101 and a slide rail connecting plate 103a which are distributed up and down in the present embodiment, where the slide rail connecting plate 103a is disposed on the slide rail 103, so as to facilitate connection between the front transmission rod 104 and the rear transmission rod 102. In terms of driving direction, four-bar mechanisms are arranged on the left side and the right side of the seat, the four-bar mechanisms on the two sides can be connected through a linkage rod 40 to realize linkage, and thus synchronous lifting of the four-bar mechanisms on the two sides can be realized by arranging a height adjuster on one side.

As shown in fig. 5, the high-speed regulator 60 has a driving gear 601, and when the high-speed regulator 60 is operated, the driving gear 601 can be driven to rotate, and the main body of the high-speed regulator 60 is arranged on the outer side of the seat frame side plate 101, and comprises a mounting plate 602 for mounting the driving gear 601, and the mounted driving gear 601 extends into the inner side of the seat frame side plate 101.

The height adjusting device further includes a tooth driving member meshed with the driving gear 601, and a link 20, where the tooth driving member and the link 20 are both disposed on the inner side of the seat frame side plate 101, and one end of the link 20 is hinged to a four-bar mechanism, and of course, in order to achieve linkage, the link 20 is hinged to a portion of the four-bar mechanism other than the seat frame side plate 101. When the high adjuster 60 (e.g., manually rotated by a driver) is operated to rotate the driving gear 601, the driving gear 601 engages with the tooth driving member, and the tooth driving member drives the link 20 to move, thereby driving the four-bar mechanism to move, and achieving height adjustment.

In particular, in the present embodiment, the tooth transmission member includes a rack 80 capable of meshing with the drive gear 601, and the rack 80 is fixed to the link 20.

Referring to fig. 7-9, fig. 7 is a schematic diagram illustrating the assembled structure of the connecting rod 20 and the rack 80 in fig. 4; FIG. 8 is a cross-sectional view taken along line A-A of FIG. 7; fig. 9 is a schematic view illustrating the assembly of the connecting rod 20 and the rack 80 of fig. 7.

As shown in fig. 9, a rack 80 is fixed to one end of the link 20. Specifically, a long groove 201 may be provided at one end of the connecting rod 20, the rack 80 is located in the long groove 201, and the tooth portion of the rack 80 extends out of the notch of the long groove 201. The connecting rod 20 is provided with a connecting hole, and after the rack 80 is inserted into the long groove 201, the first fastener 1a and the second fastener 1b are inserted into the connecting hole of the connecting rod 20, the rack 80, and the rack 80 and the connecting rod 20 are detachably fixed. As shown in fig. 5, the rack 80 is exposed just below the tooth portion of the link 20, and is a drive gear 601 extending from the outside to the inside of the seat frame side plate 101, and the tooth portion of the rack 80 is engaged with the drive gear 601.

The lower part of the seat can be provided with the sliding rail 103 for driving the seat to move back and forth, and as described above, the bottom of the four-bar mechanism is the sliding rail, and the sliding rail connecting plate 103a is arranged on the sliding rail 103. At the bottom of the cabin, a rail may be provided, as shown in fig. 4 (in which the slide rail 103 is inserted), along which the slide rail 103 can slide, enabling the seat to move back and forth. The aforementioned connecting rod 20 can be hinged to the slide connecting plate 103a with the rear transmission rod 102 and the front transmission rod 104, so as to facilitate connection and avoid interference with sliding of the slide 103.

The principle of the height adjustment device in this embodiment can be understood in connection with fig. 10, and fig. 10 is a schematic view of the height adjustment device in fig. 4. Where AEC denotes a slide connection plate 103a, e denotes a hinge point of the link 20 and the slide connection plate 103a, F denotes a driving gear 601, bfd denotes a seat frame side plate 101, ab, CD denotes a rear transmission lever 102, a front transmission lever 104.

Operating the recliner 60, the driving gear 601 rotates, for example, the driving gear 601 rotates counterclockwise in fig. 5, the distance between the hinge point E of the rack 80 and the position point F of the driving gear 601 increases, the seat frame side plate 101 is driven to move rightward, and the entire four-bar mechanism swings rightward, so that the seat height increases; the driving gear 601 rotates clockwise, and conversely, the seat height is lowered.

Therefore, compared with the scheme of the background technology, on one hand, the embodiment reduces the number of the rotary joints, and as shown in fig. 10, only the E point is a hinge point, so that the production and assembly process is simpler, and the efficiency and the operation reliability are saved; in addition, due to the reduction of the number of the rotating joints, the release gap of the whole height adjusting mechanism is reduced, so that the Z-direction (vertical direction) is reduced, and the riding comfort is improved.

It should be noted that, in this solution, the driving of the four-bar mechanism is achieved through the length variation of the connecting rod 20, the rack 80 is fixed on the connecting rod 20, and the travel directions of the two are consistent, so that when different travel requirements exist for the cushion frame, only the connecting rod 20 needs to be replaced, and the rack 80 does not need to be replaced. It should be appreciated that the rack 80 is typically a fine blanking member, requiring a heat treatment, and the processing costs are relatively high, while the connecting rod 20 may be a plain blanking member, with relatively low die costs, and without requiring a heat treatment.

It can be seen that when the background art faces different travel demands, the toothed plate needs to be replaced, and the rack 80 in the scheme can be used as a general component, so that the development cost of the product is reduced. Thus, the rack 80 is detachably connected to the link 80. Of course, the detachable connection is not limited to the above-described manner of connecting the elongated slot 201 and the fastener, but the elongated slot 201 is convenient for installation, and may also hold the rack.

It will be appreciated that the link 20 and rack 80 may be integrally formed as a unitary link portion, or may be welded or otherwise secured, without regard to cost. In fact, the presence or absence of a separate rack does not affect the achievement of the object of the invention, as long as the link portion has a tooth portion that cooperates with the drive gear 601.

In contrast to fig. 3 and 10, in fig. 3, as three rotational joints are provided, the toothed plate needs to rotate to drive the connecting rod and then drive the four-bar mechanism, so that the toothed plate and the connecting rod can be unfolded to be linked and occupy a certain height space, and as can be seen from a simplified diagram, the hinge point E needs to be at a higher position, and is reflected to a solid structure, and the height of the whole height adjusting device can be higher; in fig. 10, the rack 80 is fixed at one end of the connecting rod 20, the other end is directly hinged to the slide connecting plate 103a, the height adjustment can be realized by changing the length (the distance of EF in fig. 10) between the hinge point E and the driving gear 601 through meshing, and the height adjustment is not needed to be realized through swinging, so that the requirement on the height space can be greatly reduced, and the height of the whole height adjusting device can be correspondingly reduced.

In principle, one end of the link 20 is not limited to be hinged to the slide connection plate 103a, but may be the rear transmission rod 102 or the front transmission rod 104, which also has the above effects and can be adjusted according to the actual seat structure. It will be appreciated that the end of the link 20 is hinged to the slide connection plate 103a only as a specific example of the case where the slide 103 is provided, and may be actually hinged to the bottom of the four-bar mechanism, for example, other positions of the slide 103 may be used.

In addition, as shown in fig. 9, a section where the long groove 201 is provided is defined as a rack section, other sections are defined as connection sections, and the connection sections of the link 20 and the rack section are specifically disposed at obtuse angles in this embodiment, but this is not limited in practice, and whether the connection sections and the rack sections have angles or are disposed in a straight line may be designed according to the space requirement of the seat. Of course, the link 20 of this structure facilitates the engagement with the driving gear 601 and the hinging to the four-bar linkage in a proper position in a limited space, enhancing the comfort of passengers.

With continued reference to fig. 4 and 5, the height adjuster 60 is fixed to the seat frame side plate 101 of the four-bar mechanism by a plurality of bolts, such as the first bolt 60a, the second bolt 60b, and the third bolt 60c shown in fig. 6. The rack segment of the connecting rod 20 may be located between one of the bolts and the drive gear 601, as shown in fig. 5, between the first bolt 60a and the drive gear 601. In this way, the drive gear 601 and the bolt can act similarly to "clamping" the rack 80 segment, preventing the rack 80 segment from disengaging from the drive gear 601, ensuring the meshing effect of the rack 80 and the drive gear 601.

The sleeve 50 may be provided inside the frame side plate 101, the sleeve 50 may be stepped as shown in the drawing, and the first bolt 60a is inserted into the sleeve 50, and at this time, the rack section is located between the sleeve 50 and the driving gear 601 and is attached to the outer surface of the sleeve 50 (attached to the outer surface of the noise reduction sleeve 70 when the noise reduction sleeve 70 is provided), so as to reduce friction. Here, the long groove 201 of the rack section may be a through groove, that is, may be provided with notches from the top to bottom in view of fig. 7, so long as the tooth portion of the rack 80 can be exposed. When the first bolt 60a is limited, since the rack 80 is a fine blanking member, when the long groove 201 formed in the rack section is a through groove, the back of the rack 80 is preferably a notch which is not exposed out of the upper portion of the long groove 201, so as to avoid contact with the first bolt 60a (or the self-lubricating shaft sleeve 50 or the noise reduction sleeve 70 described below), and prolong the service life.

Further, the noise reduction sleeve 70 may be sleeved outside the first bolt 60a contacting with the rack section, as shown in fig. 5, three bolts for fastening the high adjuster 60 are provided in total, the rack section is located between the upper first bolt 60a and the driving gear 601, the noise reduction sleeve 70 is sleeved on the upper first bolt 60a, and the two bolts below do not need to be sleeved. When the self-lubricating bearing 50 is specifically provided, the noise reduction sleeve 70 may be directly sleeved on the outer side of the shaft sleeve 50. Since the first bolt 60a contacts the rack segment, the rack segment may rub against the bolt when the seat height is adjusted, possibly generating noise, and the noise reduction sleeve 70 is provided, and the rack segment contacts the noise reduction sleeve 70, noise can be reduced.

Since the height adjuster 60 needs to be fixed to the seat frame side plate 101, the present embodiment stabilizes the position of the link 20 by using a bolt for fixing the height adjuster 60, and improves the reliability thereof. It will be appreciated that when the height adjuster 60 is fixed by other means, or the bolt position is not suitable for achieving the above-mentioned clamping action, a separate limiting portion may be provided, and the rack 80 may be provided between the limiting portion and the driving gear 601, that is, the limiting portion is not limited to the bolt for fastening the height adjuster 60.

As shown in fig. 5 and 7, the rack section is provided with a front protrusion 20a and a rear protrusion 20b along the length direction, so that when the driving gear 601 engages the rack 80, a limit portion, such as the first bolt 60a, of the rack section can resist the front protrusion 20a or the rear protrusion 20b, preventing the operation stroke from being too large (the height adjustment has the requirement of adjusting the range, the front and rear protrusions are mainly opened to limit effect), and causing the rack 80 to disengage from the driving gear 601 along the engagement direction. In fig. 7, a section of the rack bar is milled in a length direction, that is, an upper surface contacting the first bolt 60a is formed, and front protrusions 20a and rear protrusions 20b are formed at both ends.

The seat height adjusting device further includes a support plate 30 and a height adjuster 60 provided on the inner side and the outer side of the seat frame side plate 101, respectively, and a first bolt 60a, a second bolt 60b, and a third bolt 60c connect the seat frame side plate 101 and the support plate 30, and the support plate 30 is provided with a first bolt hole 302, a second bolt hole 303, and a third bolt hole 304 that are engaged with the three bolts in fig. 11. The provision of the support plate 30 makes the fixation of the height adjuster 60 more reliable.

At this time, the link 20 is located between the seat frame side plate 101 and the support plate 30, and a contact portion may be provided on the support plate 30 so as to be in contact with the surface 202 of the link 20 (the side surface facing the support plate 30) and located between the seat frame side plate 101 and the support plate 30, so that the link 20 is prevented from moving sideways (being offset in the left-right direction of the seat) and separating from the drive gear 601, and the meshing effect is ensured.

As shown in fig. 11, fig. 11 is a schematic view of the support plate 30 of fig. 6. The abutment may be a half-punched boss 301 as shown in fig. 11, i.e. no through hole is punched, but only a protrusion is formed. The half punch boss 301 abuts against the surface of the rack 80 section of the connecting rod 20. Obviously, the abutment may be other structures, such as a boss structure welded or screwed to the support plate 30.

The invention also provides a seat, which comprises the seat height adjusting device, and has the same beneficial effects and is not repeated.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims

1. A seat height adjustment device comprising a recliner (60) having a drive gear (601) and a four bar mechanism for adjusting the height of the seat; the height adjusting device is characterized by further comprising a connecting rod part, wherein the connecting rod part comprises a tooth part capable of being meshed with the driving gear (601), one end of the connecting rod part is hinged to the four-bar mechanism so as to drive the four-bar mechanism to lift, the connecting rod part comprises a connecting rod (20) and a rack (80) which are detachably connected, the tooth part is the tooth part of the rack (80), one end of the connecting rod (20) is hinged to the four-bar mechanism, the connecting rod (20) is hinged to the bottom of the four-bar mechanism, and the connecting rod (20) comprises a connecting section and a rack section which are integrally connected to form a preset included angle; the connecting section is hinged to the bottom of the four-bar mechanism, the rack section is fixedly provided with the rack (80), the connecting rod (20) is provided with a long groove (201), the rack (80) is positioned in the long groove (201), and the tooth part of the rack (80) extends out of the notch of the long groove (201) to be meshed with the driving gear (601).

2. The seat height adjusting device according to claim 1, wherein a slide rail (103) for driving the seat to move back and forth is arranged below the seat, and the slide rail (103) is the bottom of the four-bar linkage (20); the sliding rail (103) is provided with a sliding rail connecting plate (103 a), and the connecting rod (20) is hinged to the sliding rail connecting plate (103 a).

3. The seat height adjustment device according to claim 1 or 2, wherein the height adjuster is fixed to a seat frame side plate (101) of the four bar mechanism by a plurality of bolts; the connecting rod (20) is positioned between one of the bolts and the driving gear (601), and the bolt is a first bolt (60 a).

4. A seat height adjustment device according to claim 3, wherein a noise reduction sleeve (70) is provided externally of the first bolt (60 a), the noise reduction sleeve (70) being in contact with the link (20).

5. The seat height adjusting device according to claim 4, wherein a boss (50) is fixed to an inner side of the seat frame side plate (101), the first bolt (60 a) passes through the boss (50), and the noise reduction sleeve (70) is externally fitted to the boss (50).

6. A seat height adjusting device according to claim 3, wherein the link (20) is provided with a front projection (20 a) and a rear projection (20 b) in the length direction, capable of abutting against the first bolt (60 a).

7. A seat height adjusting apparatus according to claim 3, further comprising a support plate (30) provided on the inner side and the outer side of the seat frame side plate (101) separately from the height adjuster (60), the bolt connecting the seat frame side plate (101) and the support plate (30); the connecting rod (20) is positioned between the seat frame side plate (101) and the supporting plate (30).

8. Seat height adjustment device according to claim 7, characterized in that the support plate is provided with a protrusion to contact the surface of the connecting rod (20) facing the support plate (30).

9. A seat comprising a height adjustment device and a seat cushion provided thereon, wherein the height adjustment device is a seat height adjustment device as claimed in any one of claims 1 to 8.