JPH1128956A - Seat for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently generate damping force even when a tilting angle of an axial line of a shock absorber is reduced by turning a projection piece so that one end of a shock absorber is pressed by means of the projection piece when an upper frame is lowered. SOLUTION: A base end side part of a shock absorber 42 is connected to a base 22 on the lower side by means of a pin 45, while the tip part of a rod 43 is connected to the tip part of a projection piece 41 in an L-shaped lever 37 via a pin 44, and to an oblong hole 40 of the lever 37, a supporting shaft 33 installed on the upper end side of a link 24 is engaged. Therefore, the L- shaped lever 37 is turned around a pin 39 by means of the supporting shaft 33 when an upper end frame 21 is moved upward/downward. As the pin 44 of the projection piece 41 positioned in the place to which the upper frame 21 is lowered is turned so as to press the rod 43 of the shock absorber 42, strong damping force can be generated even when the upper frame 21 is shifted greatly downward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat, and more particularly, to an upper frame on which a seat cushion is mounted so as to be vertically movable, and a spring and a shock absorber interposed between the upper frame and a base. The present invention relates to a vehicle seat adapted to be used.

[0002]

2. Description of the Related Art As a vehicle seat for improving sitting comfort, a vehicle seat in which a shock absorber is interposed together with a spring is used. The internal structure of such a seat is as shown in FIG. 5, and the upper frame 2 is supported on the base 1 via links 3 and 4 crossing in an X-shape so as to be movable up and down. The links 3 and 4 are rotatably connected to each other by a pin 5, one end of the link 3 is connected to the upper frame 2 by a support shaft 6, and the other end of the link 3 is connected to a long hole 8 of the base 1 by a support shaft 7. Is slidably fitted to the main body. Similarly, the other link 4 is rotatably connected to the base 1 by a support shaft 9, and a support shaft 10 at the other end of the link 4 is slidably supported by a long hole 11 of the upper frame 2. I have. And upper frame 2 and base 1
Between them, a spring 12 and a shock absorber 13 are interposed.

According to such an internal structure of the vehicle seat, the impact is buffered by the spring 12 and the up / down operation of the upper frame 2 is buffered by the shock absorber 13.

FIG. 6 shows the internal structure of another conventional vehicle seat. Here, the shock absorber 13 is mounted obliquely, and the rod 17 is rotatably connected via a pin 18 by a bracket 16 provided on the upper frame 2. The other end of the shock absorber 13 is connected to the base 1. According to such a structure, the shock absorber 13
There is no longer any restriction on the length of.

[0005]

The structure of the conventional vehicle seat shown in FIG. 5 has a drawback that the size of the shock absorber 13 is restricted or the lowering stroke of the upper frame 2 is limited.

On the other hand, according to the configuration in which the shock absorbers 13 are arranged obliquely as shown in FIG. 6, there is a problem that the damping force changes with respect to vertical displacement. Due to the vertical movement V of the suspension mechanism, the piston rod inside the shock absorber 13 generates a damping force F, so that the damping force W acts on the upper frame 2.

According to the configuration shown in FIG. 5, the relationship W = F is established because the shock absorber 13 is arranged vertically. On the other hand, according to the configuration shown in FIG. 6, the vertical motion V of the upper frame 2, the damping force W generated in the upper frame 2, the damping force F generated by the shock absorber 13, and the inclination θ of the axis of the shock absorber 13 are shown. The relationship between them is as follows.

W = F sin θ = KV sin ² θ where K represents a damping force coefficient. As is apparent from this equation, when θ changes, the upper frame W with respect to the vertical movement V
The value of the damping force changes. In particular, for the purpose of improving the ride comfort and suppressing the shock sensation with respect to the downward displacement, which is the original purpose of the vehicle seat, there is a problem that the damping force W is not sufficiently generated because θ decreases in the downward displacement.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and a sufficient damping force is generated even when a shock absorber is mounted obliquely and the inclination angle of its axis is reduced. Accordingly, it is an object of the present invention to provide a vehicle seat that improves the ride comfort.

[0010]

According to the present invention, an upper frame on which a seat cushion is mounted is supported so as to be able to move up and down, and a spring and a shock absorber are interposed between the upper frame and a base. In the vehicle seat, the shock absorber is arranged obliquely with respect to a vertical direction of the upper frame, one end of the shock absorber is connected to the base or the upper frame, and the other end of the shock absorber is connected to the other end. An L-shaped lever rotatably attached to the upper frame or the base is connected to a protruding piece protruding toward the base or the upper frame, and the L-shaped lever is moved up and down by the upper frame. When the upper frame is lowered, the protruding piece moves the other end of the shock absorber. It has to be rotated to press it relates a vehicle seat according to claim.

[0011]

1 to 4 show the internal structure of a vehicle seat according to an embodiment of the present invention. The vehicle seat is provided with a pair of left and right upper frames 21, and these frames 21 are supported on a pair of left and right bases 22 by a pair of left and right links 23 and 24 so as to be able to move up and down. The links 23 and 24 intersect in an X-shape and are connected to each other by a pin 25 at the intersection.

One end of the link 23 is rotatably connected to the upper frame 21 by a support shaft 29. The other end of the link 23 is connected to the elongated hole 31 of the base 22 via the support shaft 30.
Slidably supported by One end of the link 24 is rotatably connected to the base 22 via a support shaft 32. The other end of the link 24 is slidably supported by the support shaft 33 in the elongated hole 34 of the upper frame 21.

An L-shaped lever 37 is attached to a right end portion of the upper frame 21. The L-shaped lever 37 is rotatably supported via a pin 31 by a bracket 38 attached to the upper frame 21, and the elongated hole 40 provided in the L-shaped lever 37 is connected to the support shaft 33. To be engaged.

A projecting piece 41 is connected to the L-shaped lever 37 so as to project downward, and a rod 43 of a shock absorber 42 is rotatably connected to the projecting piece 41 by a pin 44. It has become. The opposite end of the shock absorber 42 is rotatably supported on the base 22 by a pin 45. Further, a spring 50 is arranged between the upper frame 21 and the base 22.

Therefore, according to such a configuration, the upper frame 21 moves up and down with respect to the base 22 by the pair of right and left links 23 and 24 arranged in an X shape. The elevating operation is relaxed by the spring 50 interposed between the upper frame 21 and the base 22. In addition, as shown in FIGS. 3 and 4,
The shock is attenuated by the damping force of the shock absorber 42.

Shock absorber 42 for generating damping force
Is connected to the lower base 22 by a pin 45, while the distal end of the rod 43 is connected to the distal end of the protruding piece 41 of the L-shaped lever 37 via a pin 44. In addition, the link 2 is inserted into the long hole 40 of the lever 37.
The support shaft 33 attached to the upper end side of 4 is engaged. Therefore, when the upper frame 21 moves up and down, the L-shaped lever 37 rotates about the pin 39 by the support shaft 33. That is, when the upper frame 21 is moved upward, as shown in FIG. 3, the L-shaped lever 37 is rotated counterclockwise about the pin 39, and the piston rod 43 of the shock absorber 42 is pulled out. On the other hand, when the upper frame 21 is lowered, the L-shaped lever 37 rotates clockwise about the pin 39 as shown in FIG.
Dimensions are reduced.

In particular, the projecting piece 41 provided on the L-shaped lever 37 causes the pin 44 of the projecting piece 41 to rotate so as to push the rod 43 of the shock absorber 42 when the upper frame 21 is lowered. In addition, even when the upper frame 21 largely moves downward, a large damping force can be generated.

The shock absorber 42 which particularly affects the ride comfort in the suspension of the vehicle seat is shown. The damping force changes depending on the method of mounting the shock absorber 42. The shock absorber 42 according to the present embodiment has the inclination angle of the shock absorber 42 when the upper frame 21 is at the lower position because the rod 43 is connected to the upper frame 21 via the L-shaped lever 37. θ is set so that the angle of its axis with respect to the horizontal is larger than in the past. Also, the shock absorber 43 when the upper frame 21 is lowered
Is increased by the clockwise rotation of the L-shaped lever 37.

According to the vehicle seat of this embodiment, the mounting angle θ of the shock absorber 42, the vertical moving speed V, the damping force F of the shock absorber 42, and the damping force W acting on the upper frame 21 are determined. The relationship is: W = Fsin θ = KVsin ² θ. Here, K represents a damping force coefficient. The vehicle seat according to the present embodiment is,
It is evident from the above equation that a larger damping force is generated due to the large θ when the angle falls. Further, when the upper frame 21 is moved up and down by the same stroke, the vehicle seat according to the present embodiment has the mounting both ends dimension l.
(See Fig. 2), the shock absorber 4
2, the speed of the movement of the rod 43 within 2 is increased,
This produces a greater damping force. That is, the vehicle seat according to the present embodiment can generate a larger damping force than the conventional vehicle seat,
This effectively suppresses the shock sensation particularly when the upper frame 21 is displaced downward, which greatly contributes to the improvement of the riding comfort.

In the above embodiment, the base end of the shock absorber 42 is rotatably connected to the base 22, and the piston rod 43 of the shock absorber 42 is rotatably attached to the upper frame 21. Although it is connected to the L-shaped lever 37, it is not necessarily limited to such a mounting structure. For example, the base end of the shock absorber 42 is
1 and an L-shaped lever 37 on the base 22.
May be rotatably mounted, and the piston rod 43 of the shock absorber 42 may be connected to the L-shaped lever 37.

[0021]

As described above, according to the present invention, the shock absorber is arranged obliquely to the vertical direction of the upper frame, one end of the shock absorber is connected to the base or the upper frame, and the other end of the shock absorber is connected. Is connected to a protruding piece protruding from the base side or the upper frame side of the L-shaped lever rotatably attached to the upper frame or the base, and furthermore, the L-shaped lever is linked with the lifting mechanism of the upper frame, When the upper frame is lowered, the projecting piece rotates so as to press the other end of the shock absorber.

Therefore, according to the present invention, particularly when the upper frame is lowered, the protruding piece of the L-shaped lever is rotated so as to press the other end of the shock absorber, so that when the upper frame is displaced downward. In this case, a large damping force is generated to suppress a shock feeling and improve riding comfort.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an internal structure of a vehicle seat.

FIG. 2 is a side view of the same.

FIG. 3 is a side view when the upper frame is raised.

FIG. 4 is a side view when the upper frame is lowered.

FIG. 5 is a side view showing the internal structure of a conventional vehicle seat.

FIG. 6 is a side view showing the internal structure of another conventional vehicle seat.

[Description of Signs] 1 Base 2 Upper frame 3, 4 Link 5 Pin 6, 7 Support shaft 8 Long hole 9, 10 Support shaft 11 Long hole 12 Spring 13 Shock absorber 16 Bracket 17 Rod 18 Pin 21 Upper frame 22 Base 23, 24 link 25 pin 29, 30 support shaft 31 long hole 32, 33 support shaft 34 long hole 37 L-shaped lever 38 bracket 39 pin 40 long hole 41 protruding piece 42 shock absorber 43 rod 44, 45 pin 50 spring

Claims (1)

[Claims] 1. A vehicle seat in which an upper frame on which a seat cushion is mounted is supported so as to be able to move up and down, and a spring and a shock absorber are interposed between the upper frame and a base. Are arranged at an angle to the vertical direction of the upper frame, and one end of the shock absorber is connected to the base or the upper frame, and the other end of the shock absorber is rotated to the upper frame or the base. The L-shaped lever, which is freely mounted, is connected to a protruding piece protruding from the base side or the upper frame side, and furthermore, the L-shaped lever is interlocked with a lifting mechanism of the upper frame, so that the upper frame is When descending, the protruding piece rotates so as to press the other end of the shock absorber. Vehicle seat, characterized in that the.