JPH0330182Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a seat suspension device for a vehicle, and particularly to its kink prevention structure.

[Prior Art] When the cushioning properties of a vehicle seat are increased, depending on the weight of the occupant, the vehicle seat may sink into the seat excessively, resulting in worse riding comfort, and may also impair visibility and operability during driving. Therefore, instead of increasing the cushioning properties of the vehicle seat, a system has been proposed in which the entire seat is elastically supported on the vehicle floor by a suspension device, and the elastic support force of the suspension device is variable according to the weight of the occupant. ing. An example of this is shown in FIGS. 3 and 4.

In the figure, the seat suspension device has a lower frame 1 provided on the vehicle floor and an upper frame 2 arranged above this in parallel, and each of these frames 1 and 2 is provided at the front end and the rear end. They are connected by parallel links 3 and 4. Each parallel link 3, 4 is formed by integrally connecting and molding left and right legs provided at symmetrical positions, and each upper end and lower end are connected to the lower frame 1.
and rotatably connected to rotating shafts 11 and 21 provided on the upper frame 2, respectively.

On the upper surface of the rear end of the lower frame 1 and the lower surface of the front end of the upper frame 2, torsion bars 5 and 6 are provided near the parallel links 3 and 4, and both ends of the torsion bars 5 are twisted to one side. is locked to the lower frame 1 or upper frame 2, and the other end is connected to the parallel link 3,
Auxiliary links 33, 4 provided on the side of one leg of 4
It is locked at 3. The spring force of the torsion bar 6 is adjusted by changing the twist angle of the end of the torsion bar 6 using an adjustment handle 7 and an adjustment mechanism connected thereto.

With the above structure, the upper frame 2 is elastically supported on the lower frame 1 in parallel thereto, and a seat cushion is placed on the upper frame 2.

[Problems to be solved by the invention] In the conventional seat suspension device described above, the spring force of the torsion bars 5 and 6 is applied to the parallel links 3 and 4.
Since it acts only on one side of the parallel links 3 and 4, the parallel links 3 and 4 may be strained, impairing smooth operation. It was necessary to take measures to strengthen the

In view of these problems, the present invention provides a seat suspension device in which no twisting force is applied to the parallel links, thereby guaranteeing smooth operation of the parallel links, and eliminating the need for measures to strengthen the rotating shaft. With the goal.

[Means for Solving the Problems] The configuration of the present invention will be explained with reference to FIG. 1. At least one pair of torsion bars 5 and 6 are provided, and one end of each of the torsion bars 5 and 6, whose both ends are twisted, is connected to the lower part. Frame 1 or Atsupa Frame 2
At the same time, each other end is locked at a symmetrical position of each of the left and right parallel links 31 and 32, respectively.

[Operations and Effects] According to the seat suspension device having the above structure, since the equal spring force of each torsion bar 5, 6 acts on the left and right parallel links 31, 32, the twisting force generated in each of the parallel links 31, 32 is as follows. They cancel each other out and dissolve.

This ensures smooth operation of the parallel links 31 and 32, and eliminates the need for reinforcement against twisting forces.

[Embodiment] In FIG. 1, a lower frame 1 provided on a vehicle floor has a front end portion as a rectangular box portion 12 extending in the left-right direction. A rotary shaft 11 is disposed at the center of the box portion 12, and the lower ends of plate-shaped parallel links 31 and 32 are connected to the left and right ends of the rotary shaft 11. The above parallel link 3 is attached to the lower frame 1.
Torsion bar 5 is placed in the front and rear positions across 1 and 32,
6 are arranged. The torsion bar 5 is the box part 12
The two ends bent and formed into a U-shape are twisted at an angle to each other, and one end abuts the bottom surface of the box part 12, and the other end touches the parallel link 3.
It is locked at the tip of an auxiliary link 33 connected to the intermediate portion of the two.

The torsion bar 6 is fixed to the lower surface of the lower frame 1 outside the box part 12, and one end thereof is attached to the box part 1.
The other end is in contact with the spring force adjustment piece 71 provided in the parallel link 31, and the other end is connected to the auxiliary link 3 in the middle of the parallel link 31.
It is locked to the tip of an auxiliary link 34 provided at a position symmetrical to 3. The spring force adjustment piece 71 has an inclined upper surface, is screwed to the rear end of the adjustment handle 7 that projects forward of the box part 12, and moves back and forth in accordance with the rotation of the handle 7. The torsion angle of the end of the torsion bar 6 is changed by the inclined surface of the adjustment piece 71 that moves back and forth, and the spring force changes.

An upper frame 2 is disposed above the lower frame 1, and the upper ends of the parallel links 31 and 32 are connected to a rotating shaft 21 provided at the front end of the upper frame 2. Further, the upper and lower ends of the plate-shaped parallel link 4 are connected to rotating shafts 11 and 21 provided at the rear ends of the lower frame 1 and the upper frame 2, respectively.

According to the seat suspension device having such a structure, when the parallel links 31 and 32 tilt due to the vertical movement of the upper frame 2, the left and right parallel links 3
The torsion bars 5 and 6 installed at symmetrical positions 1 and 32 deform by the same amount and generate the same spring force. As a result, the twisting forces generated in each of the parallel links 31 and 32 cancel each other out and are eliminated.

FIG. 2 shows another embodiment of the invention. In the figure, the torsion bars 5 and 6 are both provided in the box part 12 in front of the left and right parallel links 31 and 32, and one end of each torsion bar 5 and 6 is located at a symmetrical position of the parallel links 31 and 32, respectively. It is locked at the tips of certain auxiliary links 33 and 34.

This structure also provides the same effects as the above embodiment.

In each of the above embodiments, the torsion bars 5 and 6 may be provided on the upper frame 2, and the torsion bars 5 and 6 may be provided on the parallel link 4.
It may also be attached to and locked on both sides thereof.
Furthermore, parallel links 31 and 32 and parallel link 4
A structure in which a pair of torsion bars is provided for each can also be adopted.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of an apparatus showing one embodiment of the present invention, FIG. 2 is an overall perspective view of an apparatus showing another embodiment of the invention, and FIGS. 3 and 4 are conventional examples. FIG. 3 is an overall perspective view of the device, and FIG. 4 is an overall side view of the device. 1...Lower frame, 2...Atsupa frame,
31, 32...Parallel link, 5,6...Torsion bar.

Claims (1)

[Scope of utility model registration request] A lower frame arranged on the vehicle floor, an Atsupa frame arranged in parallel above it and on which the seat cushion is placed, and the left and right positions of the front and rear ends of the lower frame and Atsupa frame. In a vehicle seat suspension device comprising parallel links arranged respectively, and torsion bars provided on the lower frame or upper frame to impart spring support force to these parallel links, at least one pair of the torsion bars are provided, One end of each torsion bar whose both ends are twisted is locked to the lower frame or upper frame, and the other end is locked to a symmetrical position of each of the left and right parallel links. A featured vehicle seat suspension device.