JPH08108782A - Seat for vehicle - Google Patents

Abstract

PURPOSE: To set the center of rotation of a seat for a vehicle in a designated position according to the form of a crew. CONSTITUTION: A right leg 14 and a left leg 16 of a seat 12 are installed on a car body floor 10 through hinges 18, 20. Guides 22 inserted in rail grooves 26 formed on a pedestal 24 are connected to the front leg parts 14A, 16A and the rear leg part, and ball joints 30, 31 formed on the lower parts of the guides 22 are inserted in ball joint receiving parts 28 formed on the front leg parts 14A, 16A and the rear leg part. Screws 32, 36 rotated by a motor 40 are screw- engaged with the ball joints 30, whereby the ball joints 30 of the right front leg part 14A and the left front leg part 16A are moved in the opposite directions for the same distance by the rotation of the motor 40 so that the upper space W2 between the right leg 14 and the left leg 16 can be adjusted to a designated length.

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 a vehicle seat mounted on an automobile.

[0002]

2. Description of the Related Art There are various types of vehicle seats, but an example of a vehicle seat in which the occupant sitting on the seat has an improved hold feeling is disclosed in Japanese Utility Model Laid-Open No. 1-73427.

As shown in FIG. 7, a vehicle seat 70 disclosed in this publication has a pair of left and right leg portions 72, 74.
The lower spacing W1 of the is larger than the upper spacing W2,
As shown in FIG. 8, when acceleration (arrow G in FIG. 8) is applied to the vehicle seat 70 from the vehicle width direction, the pair of left and right leg portions 72 and 74 are in the direction of acceleration around the lower ends 72A and 74A. The seat cushion 70A is inclined in the direction opposite to the acceleration direction. For this reason, the holding feeling of the occupant sitting on the seat cushion 70A is improved.

[0004]

However, in this vehicle seat 70, when the seat cushion 70A is inclined, the rotation center P of the vehicle seat 70 is extended upward by the pair of left and right leg portions 72, 74. Since it is fixed to the intersection P on the lines L1 and L2, the center of rotation P cannot be adjusted to a predetermined position according to the body shape of the occupant 80. For this reason,
When there is no line of sight Q near the rotation center P, the rotation center P
The range of rocking of the line of sight Q with respect to is widened, and the line of sight is greatly disturbed when the seat cushion is tilted. Also, the rotation center P
Even when the upper body of the occupant is near the center of the occupant to reduce the sway of the upper body when the seat cushion is tilted, the deviation between the rotation center P and the center of the upper body of the occupant becomes large depending on the body type of the occupant. The shaking of the upper half of the body increases.

In view of the above facts, an object of the present invention is to obtain a vehicle seat in which the center of rotation of the vehicle seat can be set at a predetermined position according to the body shape of an occupant.

[0006]

A vehicle seat according to a first aspect of the present invention is a vehicle seat in which a pair of left and right legs attached to a lower portion of a seat cushion has a lower spacing larger than an upper spacing. At least one of the interval and the upper interval is variable.

A second aspect of the present invention is the vehicle seat according to the first aspect of the present invention, characterized in that seat cushion height adjusting means is provided below the seat cushion.

[0008]

In the vehicle seat according to the first aspect of the present invention, at least one of the lower interval and the upper interval of the pair of left and right legs attached to the lower part of the seat cushion is adjusted,
By setting the ratio between the lower space and the upper space to a predetermined value, the center of rotation of the vehicle seat when acceleration is applied to the vehicle seat from the vehicle width direction is set to a predetermined position according to the occupant's body shape. be able to. For example, if the center of rotation of the vehicle seat is set to the line of sight according to the occupant's body type, changes in the line of sight when the seat cushion is tilted can be prevented. Further, if the center of rotation of the vehicle seat is set at the center of the upper half of the body according to the occupant's body shape, swinging of the arm when the seat cushion is tilted can be reduced, and steering stability is improved.

In the vehicle seat according to the second aspect of the present invention, after adjusting at least one of a lower interval and an upper interval of the pair of left and right legs attached to the lower portion of the seat cushion, the vehicle seat is attached to the lower portion of the seat cushion. By adjusting the seat cushion height by the seat cushion height adjusting means, the center of rotation of the vehicle seat can be set at a predetermined position according to the occupant's body shape without changing the seat cushion height.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In these figures, an arrow FR, which is shown as appropriate, indicates the front side of the vehicle, and an arrow UP indicates the upper side of the vehicle.

As shown in FIG. 1, on the vehicle body floor 10, the right leg 14 and the left leg 16 of the seat 12 are hinges 18 and 2.
The right leg 14 and the left leg 16 are attached via the hinges 18 and 20, respectively, in the vehicle width direction (see FIG. 1).
Can be swung in the directions of arrow A and arrow B).

The lower space W between the right leg 14 and the left leg 16
1 is constant. As shown in FIG. 2, the right leg 14 and the left leg 16 have front legs 14A and 16A and a rear leg 14 respectively.
B, 16B, the upper ends of the front legs 14A, 16A and the rear legs 1
Connecting portions 14C and 16C for connecting the upper ends of 4B and 16B
And are trapezoidal in side view. Front leg 14A,
A T-shaped guide 22 in a side view is provided at the upper end of 16A and the upper ends of the rear legs 14B and 16B. These guides 22 are inserted into a T-shaped rail groove 26 formed in the pedestal 24 in a side view, and when the legs 14 and 16 swing in the arrow A direction and the arrow B direction in FIG. Moves in the vehicle width direction (direction of arrow C and direction of arrow D in FIG. 1) along the rail groove 26.

As shown in FIG. 3, the front legs 14A, 16
A ball joint receiving portion 28 having an opening 28A at the upper side is formed at the upper end of A and the upper ends of the rear leg portions 14B and 16B, and these ball joint receiving portions 28 are guided from the opening 28A. Ball joints 30 and 31 formed in the lower part of 22 are inserted.

As shown in FIG. 1, a screw 32 arranged along the vehicle width direction is screwed into the ball joint 30 of the right front leg 14A, and an inner end portion of the screw 32 has a screw. The helical gear 34 is fixed. On the other hand, a screw 36 arranged along the vehicle width direction is screwed into the ball joint 30 of the left front leg 16A, and the helical gear 3 is attached to the inner end of the screw 36.
8 is fixed. These helical gears 34, 38 are provided with a motor support portion 24A provided in the central portion of the pedestal 24.
A helical gear 42 mounted on the rotating shaft of a motor 40 fixed to the gear meshes with the gear.

Therefore, the helical gear 4 is driven by the motor 40.
When the ball joint 30 of the right front leg 14A moves in the direction of arrow C in FIG. 1 by rotating the screw 2 and the screws 32 and 36, the ball joint 30 of the left front leg 16A is the same in the direction of arrow D in FIG. Move a distance. When the ball joint 30 of the right front leg 14A moves in the direction of arrow D in FIG. 1, the ball joint 30 of the left front leg 16A moves in the direction of arrow C in FIG. 1 by the same distance.

As shown in FIG. 2, a shaft 33 extends through the ball joints 31 of the right rear leg portion 14B and the left rear leg portion 16B, and the ball joint 31 has a ball joint receiving portion 28 and a connecting portion 14C. Ball joint portion 2 of right front leg portion 14A and left front leg portion 16A via 16C.
Works with 8.

Therefore, the upper distance W2 between the right leg 14 and the left leg 16 can be adjusted to a predetermined length. As shown in FIG. 3, when the inclination angles of the right leg 14 and the left leg 16 are within a predetermined range, that is, the inclination angle of the guide 22 with respect to the ball joint receiving portion 28 is within a predetermined range θ, the lower portion 22A of the guide 22 is.
And the opening 28A of the ball joint receiving portion 28 do not interfere with each other, and the ball joint receiving portion 28 has the screw 32,
It is movable in the vehicle width direction along the shaft 36 and the shaft 33.

On the other hand, as shown in FIG. 4, when the inclination angles of the right leg 14 and the left leg 16 exceed the predetermined range and the inclination angle of the guide 22 with respect to the ball joint receiving portion 28 exceeds the predetermined range, the guide 22 moves. The lower portion 22A and the opening 28A of the ball joint receiving portion 28 interfere with each other, and the ball joint receiving portion 28 is no longer inclined, and movement of the ball joint receiving portion 28 in the vehicle width direction is restricted.

As shown in FIG. 1, a seat cushion 12A is disposed above the pedestal 24, and a seat cushion frame 44 constituting the bottom of the seat cushion 12A and a seat are provided between the pedestal 24 and the seat cushion frame 44. An actuator 46 as a cushion height adjusting means is interposed. The actuator 46 is for moving the seat cushion 12A with respect to the pedestal 24 in the vertical direction (arrow E direction and arrow F direction in FIG. 1) by a predetermined amount, and has, for example, a well-known configuration having a linear motor or the like. There is.

The actuator 46 is connected to the control circuit 50, and the control circuit 50 is also connected to the motor 40. The control circuit 50 reads the rotation angle of the motor 40,
The seat cushion 1 that occurs when the upper distance W2 between the right leg 14 and the left leg 16 is changed from the rotation angle of the motor 40.
A height change ΔH of 2A, for example, as shown in FIG. 5, when the upper space W2 is narrowed to the upper space W2 shown by the imaginary line, the tilt angle α of the right leg 14 and the left leg 16 becomes large.
The height of the seat cushion 12A decreases and the height change ΔH
Occurs. The control circuit 50 estimates this height change ΔH, and operates the actuator 46 to adjust the height of the seat cushion 12A so as to supplement this height change ΔH.

The operation of this embodiment will be described below. Figure 5
As shown in FIG. 5, in the vehicle seat 12 of this embodiment, data indicating the body type of the occupant 66 seated on the seat cushion 12A, such as seat height data, is input to the control circuit 50 from a keyboard or the like. Based on this data, the control circuit 50 causes the motor 40 to rotate a predetermined number of times in a predetermined direction. As a result, the helical gear 42 rotates, and the screw 3
1, the ball joint 30 of the right front leg 14A moves in the direction of arrow C in FIG. 1, and the ball joint 30 of the left front leg 16A moves in the direction of arrow D in FIG. 1 by the same distance. Then, the upper distance W2 between the right leg 14 and the left leg 16 is set to a predetermined value.

Therefore, the ratio of the lower distance W1 and the upper distance W2 between the right leg 14 and the left leg 16 changes, and the intersection of the upward extension line L1 of the right leg 14 and the upward extension line L2 of the left leg 16 is changed. That is, the rotation center P of the vehicle seat 12 when acceleration (arrow G in FIG. 5) acts on the vehicle seat 12 from the vehicle width direction of the line of sight depending on the physique of the occupant 66 seated on the seat cushion 12A. Can be set to a position. Therefore, even if the seat 12 is tilted as shown by the broken line in FIG. 5, the change in the line of sight can be prevented.

Further, as shown in FIG. 6, the ratio of the lower distance W1 and the upper distance W2 between the right leg 14 and the left leg 16 is changed,
The center of rotation P of the vehicle seat 12 when acceleration (arrow G in FIG. 6) acts on the vehicle seat 12 from the vehicle width direction.
Can be set at the center of the upper body according to the physique of the occupant 66 seated on the seat cushion 12A. Therefore, even when the seat 12 is tilted as shown by the broken line in FIG. 6, the swing of the arm of the occupant 66 can be reduced and the seat 1
When 2 is a driver's seat, steering stability is improved.

Although not shown, the vehicle seat 1
If the center of rotation P of the vehicle seat 12 when acceleration is applied to the vehicle width direction 2 is set to the head corresponding to the physique of the occupant 66 seated on the seat cushion 12A, the seat 1
When 2 is tilted, the swing of the head of the occupant can be reduced, the gap between the visual information and the sense of the semicircular canal is reduced, and vehicle sickness can be reduced.

Further, in the vehicle seat 12 of this embodiment,
The control circuit 50 reads the rotation angle of the motor 40, and estimates from the rotation angle of the motor 40 the height change ΔH of the seat cushion 12A that occurs when the upper distance W2 between the right leg 14 and the left leg 16 is changed. To do. For example, as shown in FIG. 5, when the upper space W2 is narrowed, the tilt angle α of the right leg 14 and the left leg 16 is increased, so that the height of the seat cushion 12A is decreased and the height change ΔH of the seat cushion 12A is decreased. Occurs, the control circuit 50 estimates this height change ΔH, the actuator 46 operates, and pushes up the seat cushion 12A by the height change ΔH.

Therefore, the center of rotation of the vehicle seat 12 can be set at a predetermined position according to the body shape of the occupant without changing the height of the seat cushion 12A.

In this embodiment, the right leg 14 and the left leg 16
Although the upper distance W2 between the right leg 14 and the left leg 16 is changed, the lower distance W1 between the right leg 14 and the left leg 16 may be changed. Further, both the upper distance W2 and the lower distance W1 between the right leg 14 and the left leg 16 may be changed. Further, the configuration in which the upper space W2 and the lower space W1 between the right leg 14 and the left leg 16 are changed is not limited to the above embodiment.

[0029]

The vehicle seat according to the first aspect of the present invention is a vehicle seat in which a pair of left and right legs attached to a lower portion of a seat cushion has a lower interval larger than an upper interval. Since at least one of them is made variable, there is an excellent effect that the center of rotation of the vehicle seat can be set at a predetermined position in accordance with the body shape of the occupant.

In the vehicle seat according to the second aspect of the present invention, since the seat cushion height adjusting means is provided under the seat cushion, the seat cushion height is not changed,
It has an excellent effect that the center of rotation of the vehicle seat can be set at a predetermined position in accordance with the body shape of the occupant.

[Brief description of drawings]

1 is a sectional view taken along line 1-1 of FIG.

FIG. 2 is a side view showing a vehicle seat according to an embodiment of the present invention.

FIG. 3 is a partially enlarged sectional view of FIG. 1;

FIG. 4 is a partially enlarged sectional view of FIG.

FIG. 5 is an operation explanatory view of the vehicle seat according to the embodiment of the present invention.

FIG. 6 is an operation explanatory view of the vehicle seat according to the embodiment of the present invention.

FIG. 7 is a front view showing a vehicle seat according to a conventional example.

FIG. 8 is an operation explanatory view of a vehicle seat according to a conventional example.

[Explanation of symbols]

12 seat 14 right leg 16 left leg 18 hinge 20 hinge 22 guide 26 rail groove 28 ball joint receiving portion 30 ball joint 31 ball joint 32 screw 36 screw 40 motor 46 actuator (seat cushion height adjusting means) 50 control circuit

Claims (2)

[Claims] 1. A vehicle seat in which a pair of left and right legs attached to a lower portion of a seat cushion have a lower interval larger than an upper interval, and at least one of the lower interval and the upper interval is variable. Vehicle seat. 2. The seat cushion height adjusting means is provided below the seat cushion.
The vehicle seat described.