JPH10129323A - Suspension device for seat for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a height mechanism, in a seat for a vehicle having a seat suspension device. SOLUTION: In a seat for a vehicle with a suspension device formed such that an upper frame consisting of right and left upper frames 2B and 2A is vertically rockably supported at a lower arm 1 through parallel link mechanisms 30, 31, 32, and 33, a pinion gear 50, a rack 51, elevation links 52 and 53 of which a height mechanism consists are arranged at the upper frame. Mounting bracket 43 and 44 on the seat cushion side are coupled to the elevation links 52 and 53.

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 allows the occupant to use the seat height adjustment device and the suspension device properly, so that a comfortable sitting feeling can be obtained.

[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 vehicle seat suspension device comprising a pair of left and right upper frames that are swingably supported in a vertical direction through a link, wherein a link before and after the parallel link mechanism is formed is axially attached to the upper frame. Front and rear rotating shafts are each rotatably mounted with an elevating link, and one end of each of the front and rear elevating links is connected to a mounting bracket of a seat cushion.
A rack is connected between the other ends of the later elevating links, and a pinion gear that meshes with the rack and is rotated by a rotation operation force of an operation handle is provided on the upper frame side to adjust the height of the seat. Things.

[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 and upward.
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 pivotally attached to the upper and lower sides by rotating shafts (54) and (56). The lower ends of the links (30), (31), (32) and (33) are pins (14) (15) (16) (17) as shown in FIGS.
Thereby, it is pivotally attached to the lower frames (10) and (11) so as to be vertically rotatable.

The parallel link mechanism includes a substantially V-shaped link A (30) and a link B (31) for rotatably pivoting an intermediate portion before and after the left lower frame (10), and a right lower frame. A substantially C-shaped link C (32) that pivotally connects the middle part to the front of (11) and an I-shaped link D (33) that pivotally connects the lower end to the rear part of the right lower frame (11). Have been.

In the figure, (30B) (31B) (32B) (3
3B) Left and right upper frames (2A) (2B)
Mounting holes for pivotally connecting the rotary shafts (54) and (56) with the rotary 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.

(4) shows a mounting bracket integrated with the seat frame of the seat cushion (SC) shown in FIGS. 3 and 4. The mounting bracket (4) is connected to a height mechanism.

The height mechanism includes a rotating shaft (54) (5) before and after the link C (32) and the link D (33) constituting the parallel link mechanism are attached to the upper frame (2).
6), the lifting links (52) and (53) are rotatably mounted on the respective shafts, and one end of each of the front and rear lifting links (52) and (53) is connected to a mounting bracket of a seat cushion (SC). A rack (51) is connected between the other ends of the later lifting links (52) and (53), and a pinion gear (50) that meshes with the rack (51) and rotates by a rotational operation force of an operation handle is connected to the upper frame ( 2A), the height of the seat can be adjusted.

Then, before and after the rack (51),
A connecting piece (51A) (51B) having one end rotatably connected to the rack (51) is connected, and the other end of each of the connecting pieces (51A) (51B) is connected to the lifting link (5).
2) It is connected to the other end of (53).

The mounting bracket (4) of the illustrated seat cushion (SC) is a pair of right and left hanging vertically below the bottom of the seat cushion (SC), and the front and rear mounting legs (41) and (42), respectively. (43) and (44) are provided integrally, and the connecting pieces (51) are attached to the mounting legs (43) and (44).
A) and (51B) are connected, and the mounting legs (41) and (42) are connected to the rotating shaft (5) by the links (55) and (57) as shown in FIG.
4) It is connected to (56).

In FIG. 1, (51C) (51C)
Is a pin for rotatably mounting the rack (51) and the connecting pieces (51A) (51B), and (52A) (53A) are lifting links (52) (53) for mounting brackets (4) of the seat cushion (SC). Through holes for mounting by means of pivot pins (58B) and (59B), and (52B) and (53B) are supported by rotary shafts (52) and (56) so as to be rotatable up and down links (52) and (53) vertically. Shaft insertion hole for
2C) and (53C) connect the lifting links (52) and (53) to the connecting pieces (51A) and (51B) by connecting pins (58A) and (59).
The through holes of the connection pins (58A) and (59A) for connection in A) are shown, respectively.

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 5 show a vehicle seat having a suspension device with a height mechanism according to the present invention.
Link A (30), Link B (31), Link C (32), Link D (33) constituting the suspension device
The upper frame (2) rises by rotating upright about a pivot portion on the lower frame (2) as a center of rotation, and the upper frame (2) falls by falling down forward. The vertical shock applied to the upper frame (2) is absorbed by the shock absorber (35) and the compression coil spring (70).

By rotating the operation handle of the height mechanism, the rack (51) moves forward through the pinion gear (50) as shown in FIG. 3, and the rack (51) moves forward. Connecting piece (51C)
(51B) moves forward in conjunction with the lifting link (5
2) Rotate (53). As a result, the mounting bracket (4) connected to the lifting link (52) (53) moves up and down, so that the seat cushion (S
The height of C) is adjusted higher.

When the operation handle is turned in the opposite direction,
The rack (51) moves rearward and the seat cushion (S
The height of C) is adjusted low.

[0024] Even when the height of the seat cushion (SC) is adjusted up and down, the suspension device works effectively and the seat cushion (SC) is adjusted.
Absorb the shock applied to

FIG. 6 shows another embodiment of the height mechanism. In this embodiment, the lifting links (152) and (153) corresponding to the lifting links (52) and (53) are connected to the lifting link (5).
2) Attach it in the same way as (53), and insert a long hole (152A)
(153A) is opened, and guide pins (151A) (151A) provided at both front and rear ends of the rack (151) having a longer overall length than the rack (51) are formed in the elongated holes (152A).
(153A), and by adopting such a structure, the connecting pieces (51A) and (51B) become unnecessary, and the same operation and effect as in the above embodiment can be expected.

[0026]

According to the present invention, since a height mechanism such as a pinion gear and a rack can be provided on the upper frame side of the suspension device, the height of the occupant sitting on the seat can be increased by the height mechanism. Never be.

In the seat having the suspension device, the height mechanism is provided, so that the sitting comfort is improved, and the suspension device and the height mechanism operate independently of each other. 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 seat height 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;

FIG. 5 is an explanatory view showing a main part of the present invention.

FIG. 6 is an explanatory view showing a main part of another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower frame 2 Upper frame 30 Link A which constitutes a parallel link mechanism 31 Link B which constitutes a parallel link mechanism C 32 Link which constitutes a parallel link mechanism 33 Link D which constitutes a parallel link mechanism 41 Mounting bracket 42 Mounting bracket 43 Mounting Bracket 44 Mounting bracket 50 Pinion gear 51 Rack 151 Rack 52 Elevating link 152 Elevating link 53 Elevating link 153 Elevating link

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 before and after the parallel link mechanism is formed, before and after a link is axially mounted on an upper frame, a lifting link is rotatably mounted on a rotating shaft after the rotatable shaft. An attachment bracket for the seat cushion is connected to one end of the lifting link, and a rack is connected between the other ends of the front and rear lifting links. A suspension apparatus for a vehicle seat, wherein the height of the seat is adjusted. 2. A connecting piece having one end rotatably connected to the rack before and after the rack, and the other end of each connecting piece connected to each of the lifting links. The suspension device for a vehicle seat according to claim 1. 3. The suspension device for a vehicle seat according to claim 1, wherein a long hole is formed in the lifting link, and guide pins provided at both front and rear ends of the rack are inserted into the long hole.