JP3415209B2 - Vehicle seat structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat device.

[0002]

2. Description of the Related Art In a vehicle seat, especially in a driver's seat of a passenger car, in order to respond to the physique or taste of the driver,
Many are equipped with various mechanisms that allow adjustment of the seat condition. Japanese Utility Model Laid-Open No. 63-98836 discloses a reclining mechanism that tilts a seat back, a slide mechanism that moves a seat back and forth, a lift-up mechanism that moves a seat cushion up and down, and a rear end portion of the seat back linked to the lift-up. There is disclosed a seat including a hip-up mechanism that lifts up relative to the front end portion. With this hip-up mechanism, for example, when a person with a small physique lifts up to secure the field of view, the lumbar support point of the seat back relatively lowers in conjunction with this, so that the lumbar support regardless of body size is supported. It is possible to ensure the optimization of.

[0003]

[Problems to be Solved by the Invention] As a general tendency,
It is possible to classify the request for the seat state according to the difference in the physique of the person sitting on the seat. That is,
A person with a small physique first requests a high seat position to secure a field of view, and other requirements include the following. (1) The height of the lumbar spine in the sitting posture is low. (2) The required front and rear length of the seat cushion is short. (3) The required tilt angle of the seat back is small in relation to the arm length.

Therefore, an object of the present invention is to provide a vehicle seat device in which a required seat state based on a difference in physique is automatically formed.

[0005]

In order to achieve the above object, the present invention has the following first structure. That is, in a seat structure having a lift-up mechanism for moving a seat up and down, a first link for swingably connecting a rear portion of a seat trail upper and a rear portion of a seat cushion, and the seat tray. A front upper portion of the seat and a front portion of the seat cushion are swingably connected, and the seat upper and the seat cushion cooperate with the first link to form a first four-bar link. A second link, a third link swingably connecting the seat cushion rear part and a seat back lower part, and a third link extending upward from the first link.
It is swingably connected to the lower part of the back bag, and cooperates with the seat cushion, the seat back, and the third link to provide a second 4
An extension link forming a node link, wherein the first link and the second link are inclined so as to be located rearward as they go upward in a state before lift-up, and the first link Is set to be smaller than the inclination angle of the second link while making the link length of the first link and the link length of the second link substantially the same, and in the state after lift-up, the seat The rear portion of the cushion is made higher than the front portion of the seat cushion, and the third link and the extension link have substantially the same link length and extend substantially vertically in the state before lift-up. By being set, the third link and the extension link are
In the state after the lift up, the seat back is inclined so as to be positioned forward as it goes upward, and the position where the seat back is arranged with respect to the seat cushion is positioned relatively forward as compared with the state before the lift up. It has a structure like this.

In order to achieve the above object, the present invention has the following second construction. That is, in a vehicle seat structure including a lift-up mechanism for moving a seat up and down, the seat is provided between a seat cushion and a seat back, and works in conjunction with the lift-up mechanism to move the seat in accordance with the seat up-and-down motion. The structure is such that a seat back height adjustment link mechanism is provided that relatively lowers the height position of the seat back relative to the seat cushion when the seat back is moved upward when compared with when the seat back is moved downward.

[0007]

[0008]

[0009]

[0010]

According to the invention described in claim 1, when the physique of the occupant is small, the tendency to be lifted up is stronger than that when the physique is large. Angle and seatback angle are smaller, lower lumbar support height,
The seat cushion length is shortened, and an optimal seating condition suitable for the physique of the occupant can be obtained. In particular, when a person with a small physique lifts up the seat to secure the field of vision, the seat back will be displaced relatively forward in response to this, so the front and rear lengths of the seat cushion are for people with a small physique It will be automatically adjusted to a convenient length.

According to the second aspect of the present invention, for example, when a person with a small physique lifts up the seat to secure the field of view, the height position of the seat back becomes relatively low accordingly. Therefore, the lumbar support point of the seat back is automatically adjusted to a position convenient for a person with a small body size.

[0012]

[0013]

[0014]

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First Embodiment (FIGS. 1 and 2) In FIGS. 1 and 2, reference numeral 1 is an automobile seat, more specifically, a driver seat. The seat 1 includes a seat cushion 2 and a seat back 3, and the seat cushion 2 is attached to an upper rail via a link mechanism as described later. The upper rail 4 constitutes a part of the seat slide mechanism, and is guided by a lower rail fixed to a floor panel (not shown) so as to be movable back and forth. Since such a seat slide mechanism is conventionally known, detailed description thereof will be omitted.

The upper rail 4 and the seat cushion 2 are connected to each other via front and rear links 5 and 6 which are provided at a front and rear with a space therebetween, and the links 5 and 6 are connected to each other.
Thus, a lift-up mechanism that adjusts the height position of the seat cushion 2 is configured. That is, the front link 5
Has a lower end attached to the front end of the upper rail 5 via a shaft 7 and an upper end attached to the front end of the seat cushion 2 via a shaft 8. On the other hand, the lower end of the rear link 6 is attached to the rear end of the upper rail 5 via the shaft 9,
The upper end is attached to the rear end of the seat cushion 2 via the shaft 10. In these links 5 and 6, the distance between the shafts 7 and 8 of the front link 5 and the distance between the shafts 9 and 10 of the rear link 6 are substantially the same. When the seat cushion 2 is at the height position shown in FIG. 1, that is, at the lowest position, the links 5 and 6 are attached in an inclined posture that is inclined rearward from the lower end to the upper end.
The inclination angle θ1 and the inclination angle θ2 of the rear link 6 are
It is set so that 1> θ2.

That is, the rear link 6 is mounted in a posture that it is inclined rearward much more than the front link 5. As a result, when the seat cushion 2 is lifted up to the highest position shown in FIG. 2, a hip-up mechanism that lifts the rear portion of the seat cushion 2 larger than the front portion is configured.

The seat 1 is provided with a reclining mechanism for adjusting the tilt angle of the seat back 3. That is, the seat back 3 can be tilted about the shaft 12, and the lock mechanism thereof has a latch lever 13 rotatably attached to the side surface of the seat back 3 via the shaft 12 and the fan gear 1.
It is composed of 4 and. The seatback 3 is fixed by the pawls of the latch lever 13 meshing with the teeth of the fan gear 14, and the seatback 3 can be reclined by releasing the pawls of the latch lever 13 from the teeth of the fan gear 14.

The central shaft 12 of the seat back is the fan gear 1
It is attached to the upper end of the link 15 via 4. The link 15 is an extension link that is integrated with the above-mentioned rear side link 6 and extends upward from the rear side link 6.
The fan gear 14 is also connected to the seat cushion 2 via a third link 16 located in front of the extension link 15.

That is, the upper end of the third link 16 is the shaft 1.
7 is attached to the front end of the fan gear 14 via the shaft 7, and the lower end is the shaft 1
It is attached to the rear end portion of the seat cushion 2 via 8. Here, the third link 16 and the extension link 15 extend substantially parallel to each other and have the same link length. Further, the links 15 and 16 are attached so as to extend substantially vertically when the seat cushion 2 is at the height position, that is, the lowest position shown in FIG. As a result, when the seat cushion 2 is lifted up to the highest position shown in FIG. 2, the seat back 3 is displaced forward and downward relative to the seat cushion 2 and the tilt angle of the seat back 3 is reduced.

An actuator AC, which constitutes a driving means for lifting up, is interposed between the seat trail upper 4 and the seat cushion 2. This actuator
In the embodiment, the actuator AC is in the form of a telescopic cylinder device, one end of which is rotatably mounted on the seat trail upper 4, and the other end of which is rotatably mounted on the seat cushion 2. Has been. This actuator AC
Shows, for example, the state before the lift-up is shown in FIG. 1 and the state after the lift-up is shown in FIG. 1 by the expansion-contraction motion by the electric motor using the ball screw mechanism and the expansion-contraction motion using the fluid pressure. As shown in FIG.

With the above construction, when a driver with a small build lifts up the seat cushion 2, the rear end portion of the seat cushion 2 is lifted up more than the front end and the cushion angle θc becomes smaller according to the lifted-up amount. Hip point for seat cushion 2 P
Height H becomes relatively low. Also, seat back 3
Is relatively low in height, and the distance between the seat cushion 2 and the lumbar support point P is relatively small. Further, since the seat back 3 is displaced forward, the seat portion length L of the seat cushion 2 is reduced. Further, the inclination angle θb of the seat back 3 becomes relatively small. Therefore, the driver can adjust the seat cushion 2 according to his / her physique.
It is possible to form the state of the seat 1 according to the physique simply by lifting up.

Second Embodiment (FIG. 3) This embodiment is a modification of the first embodiment. Therefore, a part of the sheets shown in FIGS. 1 and 2 is shown in FIG. 3, and in this figure, the same elements as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. To the second
The characteristic part of the embodiment will be described.

In this embodiment, the guide rail 20 is provided in the middle portion of the upper rail 4 in the front-rear direction, and the fourth link 22 is attached to the shaft 21 inserted through the guide rail 20.
The rear end is attached and the front end of the fourth link 22 is attached to the shaft 8.

With the above structure, when the seat 1 is slid forward, that is, when the upper rail 4 is moved forward, the guide rail 2 is accompanied by this.
The rear end wall of 0 pushes the shaft 21 forward, and moves the shaft 21 forward. Then, as the shaft 21 moves forward, the front link 5 is erected via the fourth link 22. That is, as the seat 1 is slid forward, the seat 1 is lifted up according to the sliding amount, and with this lift-up,
As in the first embodiment, hip-up, downward movement of the seat back 3 and forward movement are automatically performed.

4 and subsequent drawings show other embodiments of the present invention. In the description of these embodiments, the same elements are designated by the same reference numerals, and the description thereof will be omitted as appropriate. To do Third Embodiment (FIGS. 4 and 5) The seat 1 has, in addition to the seat cushion 2 and the seat back 3, a side support 30 extending vertically along the side surface of the seat back 3, and the side support 30 includes the seat cushion 2 The rear end portion is rotatably attached to the shaft 31. A gear 32 is provided around the shaft 31, and the gear 32 is integrated with the seat cushion 2.

The rear end of a damper 33 extending in the front-rear direction is attached to the lower end of the side support 30.
Is attached to the seat cushion 2 frame 34, and the damper 33 urges the side support 30 in a standing direction (counterclockwise direction in FIG. 4).

The side support 30 includes a hip point H.264. A base rail 35 extending in an arc shape around P is fixedly provided, and a stopper 35a is provided at the lower end of the base rail 35. On the other hand, the slide rail 36 is fixed to the side surface of the seat back 3, and
Is guided by the base rail 35 and the hip point H.
It is possible to move up and down on an arc centered on P.
A tension spring 37 is stretched between the slide rail 36 and the upper end of the side support 30, and the slide rail 36 is biased upward by the spring 37.

The slide rail 36 is formed with a plurality of engaging recesses 36a on its side surface. On the other hand, the side support 30 is provided with a latch lever 38 rotatably around a shaft 39, and the latch lever 38 is provided at the upper end thereof.
A first pawl 38a that engages with the meshing recess 38 is provided, and a second pawl 38b that engages with the teeth of the gear 32 is provided at the lower end.

With the above structure, when the latch lever 38 is rotated clockwise about the shaft 39 in FIG. 4, the first claw 38a is disengaged from the slide rail 36 and
The second pawl 38b is released from the gear 32. In this state, the lower end of the latch lever 38 has the protrusion 3 of the gear 32.
2a is engaged with the damper 33, and the biasing force of the damper 33 is set to be larger than the biasing force of the spring 37. Therefore, the side support 30 is restricted from rotating counterclockwise about the shaft 31.

On the other hand, with the release of the slide rail 36,
The slide rail 36 is guided by the base rail 35 to be movable up and down, and the seat back 3 fits the driver's back while the hip point H.H. Inclination around P, that is, reclining is possible. When the slide rail 36 moves to the lower end of the base rail 35 with this reclining operation, it is received by the stopper 35a, and thereafter, the side support 30 begins to tilt toward the center of the shaft 31 against the urging force of the damper 33, and the side support 30 Finally, the seat back 3 is tilted until it becomes substantially horizontal.

Of course, in order to lock the tilting movement of the side support 30, the latch lever 38 is rotated counterclockwise so that the second side support 30 can be locked.
This can be done by engaging the claws of the above with the teeth of the gear 32.

Fourth Embodiment (FIGS. 6 to 11) This embodiment is a modification of the third embodiment, and the description will focus on the differences from the third embodiment.

In this embodiment, as shown in FIGS. 7 and 8, a pair of upper and lower guide rails 40 extending in the front-rear direction are provided on the side surface of the seat back 3, and the guide rail 4 is provided.
The slide rail 36 described above is attached to the No. 0 via the base plate 41, and the slide rail 36 is movable back and forth with respect to the seat back 3. Then, one end of a first rod 42 that moves back and forth is attached to the slide rail 36, and the first rod 42 is connected to a second rod 44 via a cable wire 43 (see FIG. 6).

Further, the gear 32 is vertically displaceable with respect to the seat cushion 2. That is, as shown in FIGS. 9 and 10, a pair of front and rear guide rails 45 extending vertically are fixedly provided at the rear end portion of the seat cushion 2, and the sliders guided by the guide rails 45 move up and down. The gear 32 is fixed to 46. One end of a third rod 47 that moves up and down is attached to the slider 46, and the third rod 47 is connected to a fourth rod 49 via a second cable wire 48.

The above-mentioned second rod 44 and fourth rod 4
9 has its front end integrated with the fifth lot 50.
One end 43a of the outer tube of the wire 43 is fixed to the seat back 3, and the other end 43b is fixed to a seat rail lower (not shown). Further, one end 48a of the outer tube of the wire 48 is fixed to the seat cushion 2, and the other end 48b is fixed to the seat rail lower. The fifth rod 50 is the seat cushion 2
Fixed to the bottom of the.

With the above structure, when the seat 1 is slid forward, the seat 1 is slid to the fifth position.
The rod 50 moves forward, the first rod 42 is pulled rearward, the base plate 41, that is, the slide rail 36 moves rearward, and the seat back 3 is relatively displaced forward. Further, with the forward movement of the fifth rod 50, the third rod 47 is pulled downward, the gear 32 is displaced downward, and the seat back 3 is displaced downward with the displacement of the gear 32. This state is shown in FIG. Therefore, when the driver slides the seat 1 back and forth according to his / her physique, the seat back 3 is displaced up and down and forward / backward according to this, and the up and down adjustment of the lumbar support point P and the seat length are adjusted. It will be.

Fifth Embodiment (FIG. 12) This embodiment has a cushion side support 50 provided on the seat cushion 2. In contrast to the cushion side support 50, the seat back side support 51 provided on the seat back 3 has the shaft 5
2 is reclinably mounted via the shaft 2, and the shaft 52 is attached to the hip point H.H. It is located at P. A tension spring 54 is stretched between the seat back side support 51 and the cushion side support 50, and the spring 54 urges the seat back 3 in the upright direction.

With the above structure, the fan gear 14 and the latch lever 13 fixed to the cushion side support 51 are fixed.
When the engagement with the seat back 3 is released, the seat back 3 fits on the back of the seated person while the hip point H.H. Reclining around P.

[Brief description of drawings]

FIG. 1 is a side view of a seat apparatus according to a first embodiment, showing a state in which a height of a seat is lowered.

FIG. 2 is a view showing a state in which a seat is lifted up, corresponding to FIG.

FIG. 3 is a partial side view partially showing a main part of a seat device according to a second embodiment.

FIG. 4 is a side view of a seat device according to a third embodiment.

5 is a sectional view taken along line X5-X5 shown in FIG.

FIG. 6 is a side view of a seat device according to a fourth embodiment.

FIG. 7 is a side view partially showing the lower portion of the seat back in the seat device of the fourth embodiment.

8 is a sectional view taken along line X8-X8 shown in FIG.

FIG. 9 is a side view partially showing the rear portion of the seat cushion in the seat device of the fourth embodiment.

10 is a cross-sectional view taken along line X10-X10 shown in FIG.

FIG. 11 is an operation explanatory view of the seat device according to the fourth embodiment.

FIG. 12 is a side view of the seat device according to the fifth embodiment.

[Explanation of symbols]

1: Automotive seat 2: Seat cushion 3: Seat back 4: Upper rail 5: Front link for lift-up 6: Rear link for lift-up 15: Extension link integrated with front link 16: Third link

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60N 2/16 A47C 1/023 A47C 7/46 B60N 2/22

Claims (2)

(57) [Claims] 1. A seat structure provided with a lift-up mechanism for moving a seat up and down, a first link for swingably connecting a rear portion of a seat trail upper and a rear portion of a seat cushion, and A front portion of the seat trail upper portion and a front portion of the seat cushion are swingably connected to each other, and the seat trail upper portion, the seat cushion, and the first link cooperate with each other to form a first four-section section. A second link that constitutes a link; a third link that swingably connects the seat cushion rear portion and a seatback lower portion; and a third link that extends upward from the first link and swings to the seatback lower portion. A seat cushion, a seat back, and an extension link that cooperates with the third link to form a second four-bar link, wherein the first link and the second link are freely connected. , In the state before the lift-up The second link is inclined so as to be positioned rearward as it goes upward, and the inclination angle of the first link is substantially equal to the link length of the first link and the link length of the second link. Is set smaller than the inclination angle of the seat cushion so that the rear portion of the seat cushion is higher than the front portion of the seat cushion in a state after lift-up, and the third link and the extension link are the same. By setting the link length so that it extends substantially vertically in the state before lift-up, the third
In the state after the lift-up, the link and the extension link are inclined so as to be positioned forward as they go upward, and the position where the seat back is arranged with respect to the seat cushion is relatively greater than that before the lift-up. The vehicle seat structure is characterized in that it is positioned on the front side. 2. A seat structure of a vehicle having a lift-up mechanism for moving a seat up and down, the seat structure being provided between a seat cushion and a seat back, and interlocking with the lift-up mechanism to respond to a seat up-and-down motion. A seat back height adjusting link mechanism that lowers the height position of the seat back relative to the seat cushion when the seat is moved upward compared to when the seat is moved downward. Vehicle seat structure.