JPH03248931A - Shock absorber fitting structure - Google Patents

Abstract

PURPOSE:To obtain high damping force even in the vicinity of a full stroke by linking one end of an auxiliary link to either of the upper and lower frames, and also connecting a shock absorber between the other one and the extended end of the auxiliary link. CONSTITUTION:A shock absorber 12 is provided on a seat suspension mechanism 18 having the upper and lower frames 14 and 16. The upper frame 14 is linked to the lower frame 16 via a left and right pair of links 20 and 22. In this case, an auxiliary link 46 is pivotally mounted on a bracket 44 fixed to the lower frame 16 with a pivotally supporting pin 48. Also a roller provided on one end 46a of the auxiliary link 46 is arranged in a roller guide 52 fixed to the upper frame 14. Moreover the outer cylinder 40 of the shock absorber 12 is pivotally mounted on the extended part 46b of the auxiliary link 46 with a pivotally supporting pin 56. Both the inner and outer cylinders 42 and 40 are mutually pushed in by oscillating the auxiliary link 46 with the elevating of the upper frame 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mounting structure for a shock absorber that avoids damping shocks, vibrations, etc. acting on a seat.

[Conventional technology]

For example, a seat suspension mechanism that isolates a seated person from shocks, vibrations, etc. transmitted to the vehicle floor, etc., and attenuates the shocks, vibrations, etc. caused by the seated person, is attached to a vehicle seat, etc.

Such a seat suspension mechanism includes an upper frame on which the seat is placed and a lower frame attached to the vehicle floor, etc., and two telescopic sets arranged in the front and back direction in a substantially X-shape. The upper frame is attached to the lower frame via links. A biasing means for biasing the upper frame to one side is disposed between the upper frame and the lower frame, and the upper frame is elastically supported with respect to the lower frame.

Further, in such a seat suspension mechanism, a shock absorber that damps shocks, vibrations, etc. acting on the upper frame is disposed between the upper frame and the lower frame. A shock absorber, for example, includes concentric inner and outer cylinders that are movable relative to each other, and creates a buffering force by restricting the flow of hydraulic fluid (oil) in the chamber of each cylinder, thereby reducing shocks, vibrations, etc. It is configured to be attenuable.

Here, in order to reduce the size of the entire seat, there is a demand for a thinner seat suspension mechanism. Therefore,
In a thin seat suspension mechanism, the shock absorber is generally arranged inclined in the front-rear direction,
Both ends of the shock absorber are pivotally connected to the upper frame and the lower frame, respectively, so as to be swingable as the upper frame moves up and down. The seat suspension mechanism is configured to be able to attenuate shocks, vibrations, etc. of the upper frame, that is, the seat, by swinging and expanding and contracting the shock absorber as the upper frame moves up and down. .

[Problem to be solved by the invention]

By the way, in a thin seat suspension mechanism, the shock absorber is installed obliquely in the front-rear direction, so it is near the full stroke of the seat suspension mechanism, that is, at sea! - Near the lower limit, the shock absorber is tilted too much and becomes nearly horizontal. In other words, near the full stroke of the seat suspension mechanism, the damping force from the shock absorber acts in the front-rear direction and becomes difficult to act in the up-down direction. As a result, the piston speed of the shock absorber decreases, making it impossible to obtain a high damping force, giving the occupant a feeling of bottoming out, and reducing the cushioning properties and stability of the seat.

Here, it is conceivable to set the damping force of the shock absorber itself to be high in advance. However, in order to make the seat suspension mechanism thinner, there is a limit to the diameter of the inner and outer cylinders of the shock absorber, and there is a risk that the configuration will become complicated.
It is difficult to set the damping force itself high.

Furthermore, even if the damping force of the shock absorber is set to a high value, the piston speed does not increase because the shock absorber is too inclined near the full stroke of the seat suspension mechanism, and a high damping force cannot be obtained.

The object of the present invention is to provide a shock absorber mounting structure that can generate a high damping force even near the full stroke of a seat suspension mechanism.

[Means to solve the problem]

To achieve this objective, according to the present invention, an auxiliary link connected at one end is pivotally connected to either the upper frame or the lower frame so as to be swingable as the upper frame moves up and down. . A shock absorber is attached between the extending end of the auxiliary link extending from the pivot point to the other side and the other of the upper frame and the lower frame.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, in a shock absorber mounting structure 10 according to the present invention, a shock absorber 1
2 is provided in a seat suspension mechanism 18 that includes an upper frame 14 on which a seat is placed and a lower frame 16 that is attached to a vehicle floor or the like. The upper frame 14 and lower frame 16 of the seat suspension mechanism are connected via, for example, two pairs of left and right links 20 and 22, and the upper frame is configured to be movable up and down with respect to the lower frame.

As shown in FIGS. 1 and 2, the two sets of links 20 and 22 of the seat suspension mechanism are, for example, formed to have the same length, and are connected at their center portions with a connecting pin 24, so that they are connected in the vertical direction. It has a roughly X-shape that can be expanded and contracted.

One end (front end) of each set of links 20.22 is, for example,
Front connecting rod 26 installed between left and right
．． 28, they are linked together in an interlocking manner.

For example, rollers 30 are provided at both ends of the front connecting rods 26 and 28, and the front connecting rods 28 and 28 are housed in the front end of the upper frame 14 and the front end of the lower frame 16, respectively. In such a configuration, frame 1
4. The lower frame 16 serves as a guide for the roller 3o,
The rollers are rolled back and forth within the upper and lower frames.

The other end (rear end) of each set of links 20.22 is connected to a connecting rod 3, for example, which is installed between the left and right
2.34, and the rear connecting rod 32 is rotatably attached to the rear end of the lower frame 16, and the rear connecting rod 34 is rotatably attached to the rear end of the upper frame 14 with bolts 36. There is. In such a configuration, the connecting rod 26, 28 caused by the rotation (expansion and contraction) of the links 2° and 22
, the change in the spacing of the rear connecting rods 32, 34 is compensated for by movement of the front end of the link. Therefore, the upper frame 14 can move up and down with respect to the lower frame 16.

In the embodiment, the links 20 and 22 are configured to have a substantially X-shape in the front-rear direction, but the link 20.22 is not limited to this, as it is sufficient to support the upper frame 14 in a vertically movable manner, and various other configurations may be used. For example, a configuration using a substantially X-shape in the left-right direction, a four-bar link, or the like may be used.

In addition, as shown in FIGS. 1 and 2, the seat number suspension mechanism part frame 14 is -1 part frame, and the lower part frame 16
It is elastically supported under the biasing force of a biasing means 38 disposed therebetween. As the biasing means 38, for example, the end 3
A substantially U-shaped 1-version bar can be used in which the 8a is bent in one direction and the other end 38b is bent downward, and a biasing force acts in the direction of separating the one end and the other end. And 1.
A biasing bar (biasing means) 38 is disposed between the two-part frame and the lower frame, with one end 38a pressed against the one-part frame 14 and the other end 38b pressed against the lower frame 16. In such a configuration, the biasing force of the tone bar 38 acts on the upper frame 14 as an upward biasing force, causing the upper frame to move toward the F section frame 1.
6, it is elastically supported.

It should be noted that the biasing means 38 is not limited to a one-way bar, as long as it can elastically support the upper frame 14, and may be composed of, for example, a compression coil spring. In such a configuration, a compression coil spring is disposed, for example, between the movable front ends of the links 20, 22 and the upper frame or the lower frame, and the front ends of the links are pressed rearward. In such a configuration, by pressing the front ends of the links 20, 22 rearward, the links expand and tend to push up the upper frame 14, so that the upper frame is elastically supported via the links.

As shown in FIGS. 1 and 3, a shock absorber is provided between the frame 14 and the lower frame 16 of the seat suspension mechanism, which can attenuate shocks, vibrations, etc. that act on the frame 1. An absorber 12 is provided.

The shock absorber 12 includes, for example, relatively movable concentric outer cylinders 40, 42 that create a damping force by restricting the flow of hydraulic fluid (oil) within the chambers of each cylinder. , shock, vibration, etc. can be damped. The structure of the shock absorber 12 is known and is not the gist of the present invention, so it will not be described in detail.

Here, according to the present invention, for example, the bracket 44
is fixed to the lower frame 16, and the auxiliary link 46 is connected to the pivot pin 4.
8, it is pivotally attached to the bracket.

One end 46a of the auxiliary link 46 is provided with a roller 5°, for example, and the roller is disposed so as to be movable within a roller guide 52 which is fixed to the frame 14 in four parts. In such a configuration, when the upper frame 14 goes up and down, "part of the frame and the lower frame 1
6, one end 46a of the auxiliary link is moved along the roller guide 52.

Therefore, the auxiliary link 46 swings about the pivot pin 48 as the upper frame 14 moves up and down.

Further, the auxiliary link 46 is integrally formed with an extending end 46b extending from the pivot pin 48 to the other side. And the outer cylinder 40 of the shock absorber
is attached to the extending end 46b of the auxiliary link, and the inner cylinder 42 is attached to the bracket 54 of the upper frame, for example, the pivot pin 56.5.
A shock absorber 12 is attached to the seat suspension mechanism 18 by pivots 8 and 8, respectively.

For example, assuming that the seat suspension mechanism 18 is in a steady state as shown in FIG. is contracted while moving its front end, and the upper frame is lowered against the biasing force of the torsion bar 38. At this time, the auxiliary link 46
4, while moving the roller 50 backward within the roller guide 48, centering on the pivot pin 48,
Swings clockwise. Then, as shown in Figure 4, as the auxiliary link 46 swings, the extending end 46b of the auxiliary link swings clockwise, and the shock absorber
The outer cylinder 40 of is pushed up, and the outer cylinder and inner cylinder 42 are pushed into each other.

Unlike known configurations in which the inner and outer cylinders 40, 42 of the shock absorber are pressed into each other to reduce the damping force only with respect to the stroke of the upper frame 14, in this configuration, in addition to the stroke of the upper frame, The rocking of the auxiliary link 46 pushes the inner and outer cylinders further. and,
Even if the upper frame 14 is lowered for 1 minute and the shock absorbers 12 are tilted significantly, the shock absorbers are pushed into each other via the auxiliary link 46, so the shock absorbers can be moved without reducing the piston speed. - damping force acts on the upper frame 14 via the auxiliary link 46. Therefore, even near the full stroke of the seat suspension machine $lHs, where the shock absorber 12 is greatly tilted,
A high damping force of the shock absorber 12 can be obtained. Therefore, even near the full stroke of the seat suspension mechanism 18, the feeling of the seat bottoming out can be prevented, and the cushioning properties and stability of the seat are improved.

Furthermore, since the shock absorber 12 can be installed between the extending end 46b of the auxiliary link, which swings as the upper frame 14 moves up and down, and the bracket 54 of the upper frame, the seat suspension mechanism 18 is It does not become structurally complex.

Then, a roller 50 is provided at one end 46a of the auxiliary link,
By arranging and connecting rollers within a roller guide 48 provided in the upper frame 14, the movement of one end of the auxiliary link with respect to the upper frame, that is, the rocking of the auxiliary link 16, is performed smoothly. Therefore, the damping force of the shock absorber 12 acts reliably on the upper frame 14, and in this respect as well, the cushioning properties and stability of the seat are improved.

Here, in the embodiment, the auxiliary link 46 is
6, one end 46a of the auxiliary link is connected to the upper frame 14, and one end of the shock absorber 12 is attached to the upper frame. However, on the contrary, the auxiliary link 46 whose one end 46a is connected to the lower frame 16
may be pivoted to the upper frame 14, and the shock absorber 12 may be disposed between the extending end 46b of the auxiliary link and the lower frame.

In the example, the shock absorber mounting structure is embodied in a seat suspension mechanism of an automobile sort, but the structure is not limited to this, and can also be applied to a suspension mechanism of a seat in a train, an airplane, a ship, etc. , this configuration can be applied.

Further, the present invention is not limited to the suspension mechanism of a seat, but may be applied to a structure for attaching a shock absorber to other members.

The above-mentioned embodiments are for illustrating the present invention, and are not intended to limit the scope of the present invention, and all modifications and modifications within the technical scope of the present invention are also included in the present invention. Needless to say.

〔Effect of the invention〕

As described above, according to the shock absorber mounting structure according to the present invention, as the upper frame moves up and down, the auxiliary link swings, and the inner and outer cylinders of the shock absorber are pushed into each other. Therefore, even near the full stroke of the seat suspension mechanism where the shock absorber is largely tilted, the piston speed of the shock absorber does not decrease and a high damping force can be obtained. Therefore, even near the full stroke of the seat suspension mechanism, the seat can be prevented from feeling bottomed out, and the cushioning properties and stability of the seat can be improved.

Since it is only necessary to install a shock absorber between the extending end of the auxiliary link, which swings as the upper frame moves up and down, and the other of the upper frame and the lower frame, the seat 1
- The suspension mechanism does not become structurally complicated.

Furthermore, if a roller is provided at one end of the auxiliary link, and a roller is arranged in the other roller guide of the upper frame and the lower frame to connect one end of the auxiliary link, one end of the auxiliary link with respect to the upper frame may be connected. The movement, that is, the rocking of the auxiliary link is performed smoothly. Therefore, the damping force of the shock absorber acts reliably on the upper frame, and in this respect as well, the cushioning properties and stability of the seat are improved.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view of a shock absorber mounting structure according to the present invention mounted on a seat suspension mechanism, Fig. 2 is a sectional view taken along line -H in Fig. 1, and Fig. 3 ,
FIG. 4 is a front view of the shock absorber mounting structure when the seat suspension mechanism is in steady state and near full stroke. 10: Shock absorber mounting structure, 12: Shock absorber, 14: Upper frame, 16: Lower frame, 18:
5 seat suspension mechanism, 38: biasing means, 46: auxiliary link, 46a: one end of auxiliary link, 46b: extending end of auxiliary link, 50: roller, 52: roller guide. 6

Claims (2)

[Claims] (1) In the mounting structure of a shock absorber installed in the seat suspension mechanism to damp shocks, vibrations, etc. acting on the seat, an auxiliary link connected at one end is swingable as the upper frame moves up and down. A shock absorber is installed between the extending end of the auxiliary link that is pivotally connected to either the upper frame or the lower frame and extends from the pivot point to the other side, and the other of the upper frame or the lower frame. A shock absorber mounting structure characterized by: (2) One end of the auxiliary link is formed with a roller, and the roller of the auxiliary link is disposed on a roller guide provided on the other of the upper frame and the lower frame, so that one end of the auxiliary link is formed with a roller. The shock absorber mounting structure according to claim 1, wherein the shock absorber mounting structure is connected to be swingable as the frame moves up and down.