JPS6280135A - Suspension device for seat - Google Patents

Abstract

PURPOSE:To always produce comfortable riding sensation, by a method wherein the damping force of the shock absorber of a suspension on the set side is decreased when a suspension on the car body side is brought into a hard state, and reversely, when brought into a soft state, the damping force is increased. CONSTITUTION:In a title device, a link mechanism is placed between an upper frame secured on the seat side and a lower frame secured on the car body side, and the link mechanism has a spring for shock absorption and a shock absorber 30. In this case, a shock absorber 30 is so constituted such that a piston 35, the interior of which is partitioned into two chambers 36 and 37, is engagedly mounted internally of a cylinder 31, and a rotary valve 34, serving as a damping force varying means, is engaged internally of a piston rod 32. The valve 34 is controlled through a control rod 33 by means of an actuator 40 such that, when the damping force of the shock absorber on the car body side is high or low, the damping force of the shock absorber 30 on the seat side is decreased or increased, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a suspension device for a vehicle seat.

[Conventional technology]

2. Description of the Related Art Some vehicles have so-called hard body suspensions, and have a suspension mechanism installed on the passenger seat in order to improve riding comfort.

Furthermore, some vehicles have a variable damping force of a shock absorber in a suspension on the vehicle body side.

In this vehicle, when the damping force of the shock absorber is increased, the suspension becomes hard, and when the damping force is decreased, the suspension becomes soft. Even in this vehicle, if the suspension is hard, the ride becomes uncomfortable, so it is desirable to add a suspension mechanism to the seat.

[Problem that the invention seeks to solve]

However, when a suspension mechanism is attached to the seat to improve ride comfort, a comfortable ride can be obtained when the suspension on the vehicle body side is set to hard, but when the suspension on the vehicle body side is switched to soft, the suspension mechanism on the vehicle body and seat side Both become soft, resulting in an unstable ride.

Therefore, the purpose of the present invention is to provide a comfortable ride in a vehicle in which the damping force of the shock absorber in the vehicle body suspension is variable, regardless of changes in the damping force.

[Means for solving problems]

Therefore, the present invention is characterized in that the damping force of the shock absorber in the seat side suspension is reduced when the vehicle body side suspension is set to be hard, and is increased when the vehicle body side suspension is set to be soft.

Specifically, the seat suspension device of the present invention includes:
It is used in the seat of a vehicle in which the damping force of the shock absorber in the vehicle body side suspension is variable, and includes a link mechanism that supports the seat against the vehicle body, and a link mechanism that is installed within the link mechanism to provide a force that counteracts the weight applied to the seat. The spring that is always applied is also provided in the link mechanism,
a shock absorber that damps the force of the seat vibrating in the weight direction; an actuator that is provided on the shock absorber and changes the damping force of the shock absorber;
The actuator is configured to reduce the damping force of the seat-side shock absorber when the damping force of the vehicle-side shock absorber is increased, and to increase the damping force of the seat-side shock absorber when the damping force of the vehicle-side shock absorber is decreased. and a control circuit that controls the operation of the controller.

[Effect]

As a result, the damping force of the shock absorber of the seat side suspension is changed in conjunction with the change in the damping force of the shock absorber of the vehicle body side suspension, and when the body side suspension is set to hard, the seat side suspension is set to be soft. Conversely, when the vehicle body side suspension is set to be soft, the seat side suspension is set to be hard.

Therefore, when the suspension on the vehicle body is hard and cannot absorb vibrations from the road surface, the suspension on the seat side absorbs it, and when the suspension on the vehicle body side is soft and absorbs vibrations from the road surface well, the suspension on the seat side absorbs it. As a hard material, it improves the stability of the seat.

〔Example〕

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

FIGS. 1 to 9 show an embodiment of the present invention. In FIG. 2, IO indicates a suspension device for a seat, and 50 indicates a seat. The details of the seat suspension device will be explained below with reference to FIG.

A link mechanism 13 is provided between the upper frame 11 fixed to the seat side and the lower frame 12 fixed to the vehicle body side.
is provided, and the distance between the upper frame 11 and the lower frame 12 is made variable by the link mechanism 13. There are two springs 21 and 22 in the link mechanism 13.
The tensile force of these springs 21 and 22 is applied in a direction that increases the distance between the upper frame 11 and the lower frame 12. Further, a shock absorber 3o is also disposed in the link mechanism 13, and the shock absorber 3o acts to damp vibrations caused when the distance between the upper frame 11 and the lower frame 12 increases or decreases. do. In addition, various levers, handles, etc. are arranged in the suspension device 10, as is well known.

As shown in FIGS. 4 and 5, the above-mentioned shock absorber 30 has a piston 35 inserted into a cylinder 31 to form two chambers 36.37, and low pressure gas is introduced into these chambers 36.37. The piston 35 forms an orifice communicating the two chambers 36 and 37, and a piston rod 32 is connected to the piston 35. Furthermore, the piston rod 32 is made of a hollow body, and a rotary valve 34 is fitted into the hollow body, so that the rotary valve 34 is rotated by the control rod 33. The rotary valve 34 is also made of a hollow body like the piston rod 32, and as is clear from FIGS. 6 to 8, a through hole 38 is formed in a part of the side wall. These through holes 38 form orifices 39 drilled at corresponding positions in the side wall of the piston rod 32 when the rotary valve 34 is rotated 60'' counterclockwise from the position shown in FIGS. 6 to 8. For ease of understanding, Figure 5 shows each through hole 3.
8 and the orifice 39 are shown communicating with each other.

Therefore, when the rotor valve 34 is rotated 60° counterclockwise from the positions shown in FIGS. 6 to 8 and is in the position shown in FIG. 5, with each through hole 38 and each orifice 39 communicating with each other, When the shock absorber 30 receives a vibrating force, as shown in FIGS. 9A and 9B, the low pressure gas sealed in the two chambers 36 and 37
．． 37 by a relatively large amount, and the damping force of the shock absorber 30 is brought into a small state. On the other hand, when the low-pressure valve 34 is in the position shown in FIGS. 6 to 8 and each through hole 38 and each orifice 39 are not in communication with each other,
When the shock absorber 30 is subjected to a vibrating force, as shown in FIGS. The damping force of is assumed to be large.

Furthermore, an actuator 40 is provided at the end of the control rod 33 and is configured to rotate the rotary valve 34 via the control rod 33. That is, a key part of a fan-shaped sector gear 43 is fixed to the tip of the control loft 33, and the sector gear 43 is rotated by the motor 41 via the pinion 42. A stopper 44 is fixed on the rotation locus of the sector gear 43.
The rotation range is regulated.

Therefore, the sector gear 43 is rotated within a predetermined range by the operation of the motor 41, thereby rotating the rotary valve 34.

FIG. 1 shows the electrical configuration, where 64 is an on-vehicle battery, and 62 is a control circuit for varying the damping force of a shock absorber (not shown) of a suspension on the vehicle body side. As is well known, this control circuit 62 controls the motor 63 according to a command signal from a selection switch 61 for selecting whether the suspension is hard or soft.
It operates to switch the damping force of the shock absorber on the vehicle body.

Actuator 40 of seat side shock absorber 30
In the case of FIG. 1, the suspension device 10 is provided on the two left and right seats, so there is a dedicated motor 41L and a Furukawa motor 41R, and the motor 63
are connected in parallel. However, motors 41L and 41R
is connected to the motor 63 so that its operating direction is opposite to that of the motor 63.

Therefore, when a signal to increase the damping force of the vehicle body side shock absorber is supplied from the control circuit 62) to the motor 63, the motors 41L and 41R are operated in the direction of decreasing the damping force of the seat side shock absorber 30. vice versa,
When a signal for reducing the damping force of the vehicle body side shock absorber is supplied from the control circuit 62 to the motor 63, the motor 4
1L and 41R are operated in a direction to increase the damping force of the seat-side shock absorber 30.

Therefore, when the suspension on the body side is set to be hard, the suspension on the seat side is set to be soft so that vibrations from the road surface are well absorbed by the suspension on the seat side.Conversely, when the suspension on the body side is set to be soft, the suspension on the seat side is set to be The suspension is hard and ensures a stable ride.

Although specific embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and includes various embodiments within the scope of the claims. For example, the damping force of each shock absorber may be changed in three or more steps or steplessly.

〔Effect of the invention〕

As described above, according to the present invention, in a vehicle in which the damping force of the shock absorber in the vehicle body side suspension is variable, the damping force of the shock absorber in the seat side suspension is reduced when the body side suspension is set to be hard. However, when the suspension on the vehicle body side is set to be soft, the damping force is increased, so that a comfortable ride can always be obtained regardless of changes in the damping force of the suspension on the vehicle body side.

[Brief explanation of drawings]

1 to 9 show an embodiment of the present invention, FIG. 1 is an electric circuit diagram showing the electrical configuration, FIG. 2 is a perspective view showing the mechanical configuration, and FIG. 3 is only the suspension device. FIG. 4 is a perspective view of the actuator, FIG. 5 is a vertical sectional view of the shock absorber, and FIGS. 6 to 8 are V in FIG.
1--Vl line, ■--■ line, ■--■ line sectional views, and FIG. 9 are diagrams for explaining the damping action of the shock absorber. 10--Suspension device 13--Link mechanism 21.22--Spring 30--Shock absorber 40--
--Actuator 41.41L, 41R--Motor 50--Seat 62--Control circuit

Claims (1)

[Scope of Claims] 1. In a vehicle seat in which the damping force of a shock absorber in the vehicle body side suspension is variable, there is provided a link mechanism that supports the seat relative to the vehicle body, and a weight that is provided within the link mechanism and is applied to the seat. a spring that constantly applies a force that opposes the movement of the seat; a shock absorber that is installed in the link mechanism and damps the force that causes the seat to vibrate in the weight direction; and an actuator that is installed on the shock absorber and changes the damping force of the shock absorber. , when the damping force of the vehicle body side shock absorber is increased, the damping force of the seat side shock absorber is decreased, and when the damping force of the vehicle body side shock absorber is decreased, the damping force of the seat side shock absorber is increased; A suspension device for a seat, comprising: a control circuit that controls the operation of an actuator;