JPH10129322A - Suspension system for vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a feeling of sitting by arranging a sector gear, which is geared to a pinion gear and journalled rotationally in the vertical direction, and connecting a mounting bracket suspended from the bottom part of a seat to the sector gear. SOLUTION: Mounting brackets 43, 44, which are suspended on the left and right sides of the front and rear parts of a seat frame 4, are connected to a height mechanism respectively. A vertical impact applied to an upper frame 2 is absorbed by means of a shock absorber 35 and a compression coil spring. When an operation handle in the height mechanism is operated so as to be turned, sector gears 51, 61 are turned in the vertical direction via pinion gears 50, 60, so that a seat frame 4 connected to the sector gears 51, 61 is moved vertically, and as a result, the height of a seat cushion (SC) is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension device provided in a vehicle seat such as an automobile seat (seat) for absorbing vibration during traveling on a rough road or the like.

[0002]

2. Description of the Related Art Some conventional automobile seats include a suspension device for elastically supporting the seat in order to improve the seating performance of the seat. On the other hand, some seats such as a driver's seat for an automobile are provided with a seat height adjusting device that can adjust the height of a seat surface according to the sitting height or preference of a seated person.

There is also disclosed a vehicle having both a seat height adjusting device and a suspension device (for example, Japanese Patent Application Laid-Open No. 61-200040). This has the advantage that the seated person can use the seat height adjustment device and the suspension device properly, and thus can obtain a comfortable seating feeling.

[0004]

Conventional products provided with the above-described seat height adjusting device and suspension device, respectively,
Since the two devices are switched by a clutch, the structure becomes complicated and the hip point of the occupant becomes high.

Accordingly, an object of the present invention is to provide a seat suspension device which has a simple structure and does not increase the hip point of a seated person.

[0006]

According to the present invention, there is provided a suspension system for a vehicle seat according to the present invention, comprising a pair of left and right lower frames fixed to a vehicle floor, and a parallel link mechanism connected to the lower frames. A suspension device for a vehicle seat comprising a pair of left and right upper frames supported swingably in a vertical direction through the upper frame, wherein the upper frame includes a pinion gear that is rotated by a rotation operation force of an operation handle; A sector gear meshed with a pinion gear and pivotally mounted in a vertically rotatable manner is provided, and a mounting bracket hanging down from the bottom of the seat is connected to the sector gear.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 is an exploded view of a suspension device according to the present invention, in which (1) is a lower frame composed of a left lower frame (10) and a right lower frame (11). )
The left and right lower frames (10) and (11) are connected integrally by connecting rods (12) and (13) at the front and rear.
Are fixed on a slide rail for adjusting the front and rear of a vehicle floor or a seat provided on the vehicle floor.

In the drawing, reference numeral (2) denotes an upper frame which is attached to the lower frame (1) by a parallel link mechanism so as to be vertically swingable. The upper frame (2) is composed of a left upper frame (2A) and a right side. The left and right upper frames (2A) and (2B) are integrally connected on the front side by a connecting rod (2C).

The left and right upper frames (2A) (2
B) has attachment parts (20) and (2) bent vertically downward.
1), (22) and (23) are integrally formed before and after, and the upper ends of the links (30), (31), (32) and (33) constituting the parallel link mechanism are formed in the respective mounting portions (20). FIG.
As shown in FIG. 4, it is rotatably mounted on the rotating shafts (52) and (62) so as to be vertically rotatable. The lower end of each link (30) (31) (32) (33) is a pin (1).
4) By (15), (16) and (17), they are pivotally attached to the lower frames (10) and (11) so as to be vertically rotatable.

The parallel link mechanism comprises a substantially V-shaped link A (30) and a link B (31) for pivotally connecting an intermediate portion to the front and rear of the left lower frame (10), and a right lower frame (11). ), A substantially C-shaped link C (32) for pivotally connecting the intermediate portion, and an I-shaped link D (33) for pivotally connecting the lower end to the rear of the right lower frame (11). I have.

In the figure, (30B) (31b) (32B) (3
3B) Left and right upper frames (2A) (2B)
Mounting holes for pivotally connecting the rotation shafts (52) and (62) with the rotation shafts (30A), (31A), (32A), and (33).
A) shows mounting holes for pivotally inserting the pivot pins (14) (15) (16) (17) into the left and right lower frames (10) (11), respectively. This pivot pin (14) ...
In each link (30) ... left, right lower frame (10)
The portion pivotally connected to (11) is referred to as a pivoted portion.

The rear end (30C) of the link A (30) and the rear end (31C) of the link B (31) are linked to the link A (30),
The link B (31) is attached to the upper frame (2A) and the lower frame (10) so as to be higher than the pivot portion of the lower frame (10).
0) and both rear ends (30C) and (31C) of link B (31).
A connecting rod (34) is connected between C).

The link C (32) has an upper end pivotally connected to the left upper frame (2B) as described above, and has a lower end linked to the link C (32).
The link D is disposed at a lower position with respect to the pivot portion of the (32) with respect to the right lower frame (11).
(33) has an upper end pivotally connected to the left upper frame (2B) and a lower end pivotally connected to the left lower frame (11) as described above. Then, the lower end of the link C (32) (3
2C) and a middle part (33C) of the link C (33) are provided with a shock absorber (35).

The link A (30) and the link B (3
1), the link C (32), and the link D (33) are pivotally attached to the upper frame (2) and the lower frame (1) so as to be able to undulate forward.

In the drawing, (4) shows a seat frame integrated with the seat cushion (SC) shown in FIGS. 3 and 4, and mounting brackets (4) are provided on the front, rear, left and right sides of the seat frame (4).
1) (42) (43) (44) are suspended, and each of the mounting brackets (41)... Is connected to a height mechanism.

The height mechanism comprises a front height mechanism for raising and lowering the front side of the seat cushion (SC) and a rear height mechanism for raising and lowering the rear side of the seat cushion (SC). The part and the rear part can be adjusted independently of each other.

The front height mechanism includes an upper frame (2
B) a pinion gear (5) that is rotated by a rotational operation force of an operation handle (not shown) disposed outside in a front part of the pinion gear (5).
0), a sector gear (51) with which the pinion gear (50) meshes, a rotating shaft (52) for pivotally attaching the sector gear (51) to the upper frame (2B) so as to be rotatable up and down. And a link (53) integrally welded to the rotating shaft (52).

The rear height mechanism has the same structure as the front height mechanism, and includes a pinion gear (60) and a sector gear (6).
1), a rotating shaft (62) and a link (63). The rotation shafts (52) and (62) are rotatably supported between the left and right upper frames (2A) and (2B), and the rotation shafts (52) and (62) are links (30) constituting the suspension device. (31) (32) (3
3) is rotatably mounted.

The mounting brackets (43) and (44) of the seat frame (4) are mounted on the sector gears (51) and (61) of the height mechanism, and the mounting brackets (41) and (42) are mounted on the links (53) and (63). ) Is the pin (41A) (4
2A), (43A) and (44A) are rotatably connected as shown in FIGS.

In FIG. 1, reference numeral (70) denotes a compression coil spring for urging the front portion of the upper frame (2) upward,
Reference numeral (71) denotes an adjustment cam that is integrated with the operation handle (71A) to adjust the elasticity of the compression coil spring (70), and (72) denotes a fixed cylinder that rotatably supports the adjustment cam (71).

2 to 4 show a vehicle seat having a suspension device according to the present invention. Link A (30), Link B (31), which constitute the suspension device,
The link C (32) and the link D (33) are rotated upright about a pivot portion with respect to the lower frame (2) as a center of rotation, and the upper frame (2) rises and falls forward, respectively. (2) falls. And
The vertical shock applied to the upper frame (2) is applied to the shock absorber (35) and the compression coil spring (7).
0).

When the operation handle of the height mechanism is rotated, the sector gears (51) and (61) are vertically rotated via the pinion gears (50) and (60), and the sector gear (51) is rotated. The seat frame (4) connected to (61) moves up and down to adjust the height of the seat cushion (SC).

[0023]

According to the present invention, since a height mechanism such as a pinion gear and a sector gear can be provided on the upper frame side of the suspension device, the hip point of the occupant sitting on the seat can be reduced by mounting the height mechanism. Never get higher.

In the seat having the suspension device, the height mechanism is provided, so that the seating comfort is improved, and the suspension device and the height mechanism operate independently. Therefore, since the movement in the front-rear direction by the suspension device including the link mechanism is not large, the sitting comfort is further improved.

In addition, since the height mechanism can be provided on the upper frame constituting the suspension device, the structure is simple and the height of the seat can be easily adjusted.

[Brief description of the drawings]

 ,

FIG. 1 is an exploded perspective view of the present invention.

FIG. 2 is a perspective view of a vehicle seat provided with the device of the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower frame 2 Upper frame 30 Link which comprises parallel link mechanism A 31 〃 B 32 〃 C 33 Ｄ D 41 Mounting bracket 42 ６０ 43 ４４ 44 ５０ 50 Pinion gear 60 ５１ 51 Sector gear 61 〃

Claims (3)

[Claims] 1. A vehicle seat comprising: a pair of left and right lower frames fixed to a vehicle floor side; and a pair of left and right upper frames supported on the lower frame via a parallel link mechanism so as to be vertically swingable. A suspension device, wherein the upper frame includes a pinion gear that is rotated by a rotation operation force of an operation handle, and a sector gear that meshes with the pinion gear and is axially rotatably mounted on the upper frame. A suspension device for a vehicle seat, wherein a mounting bracket hanging down from the bottom of the seat is connected to the vehicle. 2. The parallel link mechanism includes a substantially V-shaped link A and a link B having a middle portion pivotally attached to the front and rear of one lower frame, and a middle portion at a front portion of the other lower frame. It comprises a substantially C-shaped link C which is pivotally connected, and an I-shaped link D whose lower end is pivotally connected to the rear part of the other lower frame. Links A and B have one end linked to the upper frame and the other link linked. A and B are connected to each other by a connecting rod at a position higher than a pivot portion of the lower frame relative to the lower frame. The link D is pivoted at the upper end to the upper frame, and the link C
The vehicle seat suspension device according to claim 1, wherein a shock absorber is connected to a lower end of the vehicle and a middle portion of the link D. 3. The vehicle seat suspension device according to claim 1, wherein the links A, B, C, and D are respectively attached to a lower frame and an upper frame so as to be able to undulate forward.