JP3299676B2 - Seat height adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat height adjusting device provided in a vehicle seat (seat).

[0002]

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

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 is complicated and the functions of both devices cannot be obtained at the same time.

A seat having a seat height adjusting device and a suspension device is disclosed in Japanese Patent Application Laid-Open No. Hei 7-26694.
In Japanese Patent Application Publication No. 5 (1999) -1995, an upper shaft and a lower shaft constituting a front height adjuster, and an upper shaft and a lower shaft constituting a rear height adjuster are supported by a lower frame on the vehicle floor side via a vibration-proof rubber, thereby providing a seat. A technique has been disclosed in which transmitted high-frequency vibrations are supported by the vibration-isolating rubber to improve suspension properties. This technique includes a vibration-isolating body disposed on a shaft on the front side of the lower frame and a rear side of the lower frame. Is the same as the vibration isolator provided on the shaft. For this reason, the stability of the thighs of the seated person and the seating ability of the buttocks cannot be compatible with each other, and there is a problem that vibrations applied to the seat cannot be effectively absorbed. Therefore, an object of the present invention is to eliminate such a defect of the conventional product.

[0006]

According to the present invention, there is provided a seat height adjusting apparatus for achieving the above object, comprising: a rotating shaft suspended between lower frames arranged side by side on a vehicle floor; A seat-side upper frame connected to a shaft via a link, wherein the rotating shaft is rotated to move the upper frame up and down. Is composed of a front rotation shaft provided on the front side of the seat of the lower frame, and a rear rotation shaft provided on the rear side of the seat of the lower frame. Vibration is generated by torsion on the axis of the front rotation shaft. A front vibration isolator for absorbing vibration is provided, and a rear vibration isolator for absorbing vibration due to torsion and seat up / down movement is provided on the axis of the rear rotating shaft. With the above configuration, by making the absorbency different between the seat front side and the seat rear side, the stability of the thigh of the seated person,
It is possible to balance the seating properties of the buttocks and effectively absorb the vibration applied to the seat.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In the figure, (10) and (11) are lower frames fixed to the vehicle floor side in the front-rear direction, (20).
Reference numeral (21) denotes an upper frame on which a sheet is placed, which is attached to the lower frames (10) and (11) so that the height can be adjusted vertically by a height mechanism described later.

The height mechanism comprises a rear height mechanism for adjusting the rear side of the seat up and down, and a front height mechanism for adjusting the front side of the seat up and down.

Before the illustration, the rear height mechanism is adapted to adjust the height of the seat by rotating the operation handles (5A) and (5B) by the occupant.

The rear height mechanism includes an operation handle (5A) provided on the lower frame (11) and the operation handle (5A).
A) and a pinion gear (4A) integral with the pinion gear (4A), and a sector gear (3A) meshed with the pinion gear (4A). The rear rotating shaft (1A) (2A) (2A) to which the sector gear (3A) is fixed, and the upper frame (20) (21) welded to the rear rotating shaft (1A).
And a link (6A) (6A) having one end pivotally connected to the other end.

The rear rotating shaft (1A) (2A) is a central shaft (1A) for welding the link (6A) (6A).
And the rear vibration isolator (A) on both sides of this central axis (1A)
(A) are divided into end shafts (2A) and (2A) that are connected via the center shaft (1A).
Are concentrically connected via rear vibration isolators (A) and (A), and are rotatably supported by lower frames (10) and (11).

Since the sector gear (3A) is integrally welded to the end shaft (2A) on the lower frame (11) side, the pinion gear (4A) is rotated by the rotational operation force of the operation handle (5A). I do. The rotation of the pinion gear (4A) causes the pinion gear (4A) to rotate.
The sector gear (3A) that meshes with the shaft rotates, and the rear rotating shafts (2A) and (1A) rotate. This rear rotating shaft (2
A) By the rotation of (1A), the links (6A) and (6A) integrated with the central shaft (1A) rotate in the vertical direction to move the rear portions of the upper frames (20) and (21) up and down.

The front height mechanism has substantially the same structure as the rear height mechanism. That is, the operation handle (5B) provided on the lower frame (11) and the operation handle (5B)
A pinion gear (4B) integral with the pinion gear (4B), a sector gear (3B) meshed with the pinion gear (4B), and the sector gear (3B) rotatably mounted on the front portions of the left and right lower frames (10) and (11). ) Is fixed to the front rotating shaft (1B), (2B), (2B), and the front rotating shaft (1B).
Link A (6B) (6B) having a base end welded to B) and a link having one end pivotally connected to the distal end of link A (6B) (6B) and the other end pivotally connected to upper frame (20) (21). B (6B '). Therefore, the front side of the upper frames (20) and (21) is moved up and down by the rotational operation force of the operation handle (5B).

Then, the front rotating shafts (1B), (2B), (2
Similarly to the rear rotating shafts (1A), (2A) and (2A), B) also includes a central shaft (1B) formed by dividing one shaft into three, and end shafts (2B) and (2B). The end shafts (2B) and (2B) are concentrically connected to the shaft (1B) via front vibration isolators (B) and (B).

The front vibration isolators (B) and (B) and the rear vibration isolators (A) and (A) are configured to have different absorption of vibration from the vehicle floor. That is, both have the same vibration absorption by torsion, but the rear vibration isolator (A) has a structure as shown in FIG. 4 and the front vibration isolator (B) has a structure as shown in FIG.

The rear vibration isolator (A) has a center shaft (1A) connected to the end shafts (2A) and (2A) and has an HS (Shore hardness) of 45.
The elastic body (30) is connected to a center shaft (1A) by a pin (33) and is integrally fixed with a pin (33).
1) and an attachment tube (32) integrally fixed to the end shaft (2A) with a pin (33).

Accordingly, the rear vibration isolator (A) has a structure in which the end shaft (2A) is connected and supported only by the elastic body (30) with respect to the central shaft (1A). In addition to absorbing vibration by torsion, shock vibration can be absorbed by vertical movement.

On the other hand, as shown in FIG. 5, the front vibration isolator (B) connects the center shaft (1B) and the end shaft (2B) so as to be freely rotatable with each other, and also includes a front shaft between the divided front shafts. The vibration isolator is composed of a connecting pipe (43) serving as a connecting body for connecting the sheet relative movement in the vertical direction of the seat and a tubular rubber isolator (40) made of the same material as the rubber isolator (30). The rubber (40) is integrally fixed on both sides to the mounting pipes (41) and (41), and each mounting pipe (41) and (41) has a pin (42) and (42) on the center axis (1B) and the end axis (2B). Are fixed together.

Therefore, this front vibration isolator (B) cannot be expected to absorb vibration in the vertical direction due to the connecting pipe (43) connecting the central shaft (1A) and the end (2A). Vibration can be absorbed by the torsion of (40).

Each of the rear vibration isolators (A) and (A) and the front vibration isolators (B) and (B) is a link (6A) () connecting the upper frames (20) and (21) as shown. 6
Lower frame (10) (11) that is outward with respect to B)
It is arranged on the side.

The rear vibration isolator (A) and the front vibration isolator (B) provided on the illustrated lower frame (10) side are connected to the lower frame (10) via end shafts (2A) and (2B). , But may be directly attached to the lower frame (10). In FIGS. 2 and 3, (7A) indicates a brake for preventing the operation handle (5A) from rotating in the reverse direction.

As described above, the front rotating shafts (1B) and (2B) of the front height mechanism, the front vibration isolators (B) and (B), and the rear rotating shafts (1A) and (2A) of the rear height mechanism. By providing the rear vibration isolators (A) and (A), the vibration input from the vehicle floor to the lower frames (10) and (11) is absorbed by the torsion of each of the vibration isolators (A) and (B). The wearing comfort of the seat is improved.

In addition, by making the vibration absorption of the front vibration isolators (B) and (B) different from that of the rear vibration isolators (A) and (A), seat seating and stability are improved. improves.
That is, the front part of the seat, which supports the thighs of the occupant, absorbs the vibration by the torsion of the front vibration isolators (B), (B), and therefore does not move in the vertical direction, so that the size of the occupant is large. Stably supports the thigh. As described above, the rear portion of the seat, which supports the buttocks of the seated occupant, has good stability at the front portion of the seat, so that vibration absorption due to torsion of the rear vibration isolators (A) and (A) can be reduced. Seatability is improved by absorbing shock vibration due to motion. Therefore, vibration applied to the sheet can be effectively absorbed.

[0024]

According to the present invention, it is not necessary to separately provide a seat height adjusting device and a suspension device, and a space which can be effectively used below the seat can be obtained. By absorbing only, the seated person's thigh can be stably supported, and the rear part of the seat absorbs vibration by torsion and shock vibration by vertical movement, improving the seating of the seated person's hips. Can be done.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a sectional view of FIG. 2;

FIG. 4 is a sectional view of a rear vibration isolator.

FIG. 5 is a sectional view of a front vibration isolator.

[Explanation of symbols]

 A Vibration Isolator B Vibration Isolator 1A Rotating Axis 2A Rotating Axis 1B Rotating Axis 2B Rotating Axis 10 Lower Frame 11 Lower Frame 20 Upper Frame 21 Upper Frame

Continuation of the front page (56) References JP-A-7-266945 (JP, A) JP-A 62-100236 (JP, U) JP-A 3-80127 (JP, U) JP-A 61-32615 (JP , U) Shokai Sho 56-113231 (JP, U) Shokai Sho 63-53018 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60N 2/18 B60N 2/50

Claims (4)

(57) [Claims] A rotating shaft extending between lower frames arranged side by side on a vehicle floor; and a seat-side upper frame connected to the rotating shaft via a link. In the seat height adjusting device, the upper frame is moved in the vertical direction by moving the upper frame, the rotation axis is a front rotation axis provided on the seat front side of the lower frame, and the rotation axis of the lower frame. A rear rotation shaft provided on the rear side of the seat, a front vibration isolator that absorbs vibration by torsion is provided on an axis of the front rotation shaft, and a torsion and a seat are vertically moved on the axis of the rear rotation shaft. A seat height adjusting device comprising a rear vibration isolator for absorbing vibration. 2. The front vibration isolator and the rear vibration isolator,
The seat height adjusting device according to claim 1, wherein the seat height adjusting device is provided outside the link in the seat width direction. 3. The front rotation shaft is divided into a plurality of parts, and the front vibration isolator allows the divided front rotation shafts to freely rotate with each other, and also allows the divided front rotation shafts to rotate between the divided front rotation shafts. The seat according to claim 1, further comprising a connecting body that connects the relative movement in the vertical direction of the seat so as to be impossible, and an anti-vibration rubber interposed between the divided front rotation shafts. 4. Height adjustment device. 4. The rear rotation shaft is divided into a plurality of parts, and the rear vibration isolator is formed only of a vibration isolating rubber interposed between the divided rear rotation shafts. 3. The seat height adjusting device according to any one of the above items 3.