JP2810822B2 - Vehicle seat - 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.

[0002]

2. Description of the Related Art Japanese Utility Model Application Publication No.
As disclosed in JP-A-77533 and JP-A-2-33740, one of the left and right sides of a back frame constituting a seat back and the left and right sides of a cushion frame constituting a seat cushion. There is a vehicular seat in which a rod-shaped support member is disposed between itself and one side.
When an excessive forward force is applied to the seatback via the seatbelt at the time of a vehicle collision or the like, or when an excessive force is applied to the vehicle seat where the seatbelt is not fixed, an excessive force from the rear is applied to the vehicle seat. It is proposed to add sufficient strength to the seatback when it acts, and the support member functions as a reinforcing member for the seatback.

[0003] In the vehicle seat, it is advantageous to position the lower end of the support member with respect to the cushion frame as far forward as possible in order to sufficiently exhibit the reinforcing function of the support member. However, if the attachment site at the lower end of the support member is located forward, it will hinder passengers from getting on and off. To cope with this, a support mechanism having a truss structure in which three support rods are connected to each other is employed, and the lower end of the support mechanism is configured to be movable in the front-rear direction by driving means.
The above-mentioned publication proposes a vehicle seat having a reclining mechanism capable of adjusting a tilt angle of a backbag in the front-rear direction and disengaging a support member and a back frame in a support mechanism so that a seatback can be moved forward or backward. ing.

[0004]

In the vehicle seat, separate operations are required to adjust the inclination of the seat back in the front-rear direction and to perform both the forward and backward operations. In addition, since the operation of tilting the seat back forward and backward is performed by the driving means for adjusting the tilt angle of the seat back in the front-rear direction, there is a disadvantage that the forward-backward tilting operation takes too much time. Therefore, an object of the present invention is to solve these problems.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a seat frame comprising a back frame and a seat frame.
In a vehicle seat having a rod-shaped support member disposed between the cushion frame and the left or right side of the cushion frame, the upper end of the support member is supported by the back frame. The lower end of the member is attached to the cushion frame so as to be movable in the longitudinal direction of each of the frames, and each end of the support member is configured to be independently movable by each driving means. It is assumed that.

In the vehicle seat according to the present invention, as the control means for controlling the driving of each of the driving means, the upper and lower positions and the front and rear positions of the upper and lower ends of the support member without changing the inclination angle of the back frame. Or control means for changing the tilt angle of the back frame by changing the front and rear positions of the lower end of the support member and the upper and lower positions of the upper end of the support member, respectively. Or a control means for changing the tilt angle of the back frame by changing the upper and lower positions of the upper end of the support member without changing the front and rear positions of the lower end of the support member. preferable.

[0007]

In the vehicle seat having the above-described structure, the upper and lower ends of the support member are independently moved by the respective driving means. Therefore, by appropriately controlling the respective driving means, the following is achieved. As described above, the seatback is adjusted at an appropriate speed in the front-rear direction at an appropriate speed, the seatback is moved forward or backward at a high speed, and operations such as retreating and returning from the reinforcing position of the support member when the occupant gets on and off are performed. be able to.

(1) When the upper end of the support member is moved upward by driving one of the driving means, the seatback gradually tilts forward, and the upper end of the support member is moved downward by the driving of the driving means. When it is moved, the seatback gradually tilts backward. That is, the inclination of the seat back in the front-rear direction is adjusted at an appropriate speed by such drive control of the drive means.

(2) When the upper end of the support member is moved upward and the lower end of the support member is moved forward by the drive control of both drive means, the seatback tilts forward at a high speed. When the upper end of the support member is moved downward and the lower end of the support member is moved rearward by the drive control of both driving means, the seatback tilts backward at a high speed. That is, by the drive control of the two drive means, the back and forth of the seat back and the return from the seat back are quickly performed.

(3) When the lower end of the support member is moved backward and the upper end of the support member is moved upward by drive control of both drive means, the inclination of the seatback in the front-rear direction is not changed. The lower end of the support member can be retracted rearward. When the lower end of the support member is moved forward and the upper end of the support member is moved downward by the drive control of both driving means, the lower end of the support member is not changed without changing the inclination angle of the seat back in the front-rear direction. The part can be returned to the reinforcing position.

Therefore, in the vehicle seat, the adjustment of the inclination of the seatback in the front-rear direction and the operation of tilting the seatback are performed by drive control of the driving means, and the adjustment of the inclination of the seatback in the front-rear direction is performed. Can be moved forward and backward at an appropriate speed, and can be returned at a high speed, and the support member can be accurately advanced and retracted when the occupant gets on and off the vehicle.

In the present invention, a rod-shaped screw is employed as a movable member of the support member, which is incorporated in the back frame and the cushion frame, and the support member is screwed on each screw so as to be able to advance and retreat. When the assembling means is employed, since the movable member of the support member is accommodated in each frame, it does not cause any obstacle and the seat has a clean appearance. Further, since each screw functions as a core material of each frame, the strength of each frame is improved, which is particularly advantageous against a load from behind the seatback.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 6 show a cushion frame and a back frame constituting a vehicle seat according to the present invention. 7 shows the vehicle seat. The vehicle seat has a substantially triangular side protector 13 between one side of a seat cushion 11 and a seat back 12.
And a seat belt 14 fixed above one side of the seat back 12.

The cushion frame 21 constituting the seat cushion 11 and the back frame 22 constituting the seat back 12 are frame-shaped, and the back frame 22 is provided at the rear end of the cushion frame 21 in the front-rear direction. The cushion frame 21 is attached to the left and right sheet tracks 23 so as to be slidable in the front-rear direction. The left and right frame portions constituting the cushion frame 21 also function as movable rails of the seat track, and the right frame portion 21a is open at the top, and a first screw 24a is rotatably supported therein. The right frame portion 22 of the back frame 22
a is open at the front and has a second screw 2 inside it.
4b is rotatably supported.

The arm 25 as a support member constitutes the side protector 13, and slide pieces 25b and 25c are rotatably mounted on both ends of a rod portion 25a. The first slide piece 25b is threadably engaged with the first screw 24a as shown in FIG. 3B, and the second slide piece 25c is connected to the second screw 24a as shown in FIG. 24b is screwed forward and backward. The front end of the first screw 24a is connected to a first drive motor 27a via a gear box 26a so as to be able to transmit power, and the upper end of the second screw 24b is connected to the second drive motor 27 via a gear box 26b.
b is connected so that power transmission is possible.

The first drive motor 27a rotates in both forward and reverse directions, and rotates the first screw 24a forward and backward to slide the first slide piece 25b forward and backward.
The drive motor 27b also rotates in both forward and reverse directions, and rotates the second screw 24b in the forward and reverse directions to rotate the second slide piece 25c.
Is slid up and down, and each slide piece 25b,
25c by changing the position of 25c
2, and thus the seatback 12 can be changed to the state shown in FIGS.

The driving of each of the drive motors 27a and 27b is controlled by a control device 30 shown in FIG. The control device 30 includes a first switch 31, a second switch 32, and a third switch 3.
3. A door opening / closing sensor 34, a vehicle speed sensor 35, a key sensor 36 for detecting insertion of an engine key, and a support member 25 including a first position sensor 37a of a first slide piece 25b and a second position sensor 37b of a second slide piece. And a control unit 38. The control unit 38 includes the switches 31 to 33 and the sensors 34 to
In addition to reading each signal from 36, 37a, and 37b, it controls the driving of each of the drive motors 27a, 27b based on these detection signals in accordance with a preset program. The processing is executed as shown in the flowcharts shown in FIGS.

Each of the switches 31 to 33 is disposed on the left side of the sheet cushion 11 as shown in FIG. 7, and the first switch 31 is a two-stage seesaw switch (return type), and the second switch 31 is a second switch. The switch 32 is a changeover switch, and the third switch 33 is a seesaw switch (return type). The first switch 31 is operated to adjust the tilt angle of the seat back 12 in the front-rear direction, to quickly retract the seat back 12, and to quickly return from it. In the first switch 31, when the front portion or the rear portion is lightly pressed to be pressed small, the second drive motor 27b rotates forward and backward by a predetermined number of rotations, and strongly presses the front portion or the rear portion to increase the size. When pushed, the first and second drive motors 27a and 27b rotate forward and backward by a predetermined number of rotations.

The second switch 32 stores the protector 13 (arm 25) which obstructs the occupant when getting on and off the vehicle, and functions to set the protector 13 at a predetermined position in order to ensure safety when sitting on the vehicle. An automatic mode for storing or setting the protector 13 by judging the situation of the vehicle and the driver, and a manual for judging the situation of the vehicle and operating or storing the protector 13 by operating the third switch 33 with the driver's consciousness. This is a mode switch. When the second switch 32 is set to the auto mode, when the condition of the vehicle is 0, the door is open and there is no key, and the protector 13 is at the set position,
Automatically, the first and second drive motors 27a and 27b rotate forward and backward by a predetermined rotation to move the arm 25 rearward and retract the protector 13 rearward. When the vehicle speed is 0 and the door is closed and there is a key, the arm 25 is advanced to move the protector 13 to the set position. In these cases, the third switch 33 does not sense.

When the second switch 32 is set to the manual mode, only when the vehicle speed is 0, the door is open and there is no key, and the protector 13 is at the set position,
The arm 25 is moved rearward by the pressing operation of the third switch 33, and the protector 13 is retracted (when the vehicle gets off). Only when the vehicle speed is 0, the door is closed and there is a key, and the protector 13 is stored,
Moves forward and the protector 13 moves to the set position (when seated).

In the vehicle seat, electric power is constantly supplied from a battery mounted on the vehicle to the control device 30. When the vehicle is stopped and the vehicle is not in the vehicle, the lower end of the arm 25 is retracted when the vehicle gets off. Position (F = 0, storage position of the protector 13), and the inclination angle of the seat back 12 in the front-rear direction is maintained at the time of getting off.

The control device 30 executes the preset programs in the order shown in the flowchart of FIG.
The states of the second and third switches 33 are detected in this order. That is, the operation state of the first switch 31 is read in step 41a, and if the switch 31 is not in the operation state, the operation state of the second switch 32 is read in step 41b, and the operation state of the switch 32 is changed to the operation state in the auto mode. If not, the operation state of the third switch 33 is read in step 41c, and this operation is repeated.

When the first switch 31 is in the operating state, the program proceeds to a flowchart 42 shown in FIG. 10 and executes the flowchart. That is, in step 42a of the flowchart, the first switch 3
It is read whether or not the first operation state is a light normal state, and if it is a normal operation state, the second drive motor 27b is rotated forward and backward at a rotation speed corresponding to the operation time. This allows
The upper end of the arm 25 moves vertically by a predetermined amount,
The front-back tilt angle of the backbag 12 is adjusted to a desired value.
On the other hand, if the operation state of the first switch 31 is a pressing state due to a large pressing force, the process proceeds to step 42c, and it is determined in step 42c whether the vehicle is in a stopped state,
If it is in the stopped state, the two drive motors 27a, 27a are determined based on the operation direction of the first switch 31 in step 42d.
By rotating b forward and backward by a predetermined amount, the seatback is quickly moved backward to a relaxed state, or the seatback in the backward state is quickly returned to the normal state (see FIG. 6).

When the first switch 31 is in the non-operation state and the second switch 32 is in the auto mode operation state, the program shifts to a flowchart 43 shown in FIG. 11, and the flowchart is executed. That is, it is determined in step 43a of the flowchart that the vehicle is stopped.
The open / closed state of the door is determined at b, and if the door is open, the inserted state of the engine key is determined at step 43c. If the key is not inserted, it is determined whether or not the lower end of the arm 25 is at the set position in step 43d, and if it is in the set position, the first and second drive motors 27a, The lower end of the arm 25 is moved rearward and the upper end is moved upward by driving the arm 27b by a predetermined number of revolutions, and the position is shifted to the retracted position at the lower end of the arm 25 without changing the inclination angle of the seat back 12. (See FIG. 5). Thus, the execution of the program ends. In the seat in this state, the protector 13 is moved to the storage position, so that the occupant of the seat can easily get off the seat, and the seat can be easily boarded because the seat is held in this state. It is.

If it is determined in step 43d that the lower end of the arm 25 is at the retreat position, the execution of the program is terminated. By ending the execution of these programs, the occupant sitting on the seat cushion 11 can easily get off the vehicle by storing the protector 13 behind. If it is determined in step 43c that the key has been inserted, the execution of the program ends without moving the arm 25 to the retreat position.

On the other hand, in the program, step 4
If it is determined in step 3b that the door is in the closed state, the key insertion state is determined in step 43f, and if it is determined that the key is inserted, step 43 is performed.
g, the position of the lower end of the arm 25 is determined, and if it is determined that the arm 25 is at the set position, the program is terminated.
If it is determined that the vehicle is in the retreat position, the process proceeds to step 4
3h, the first and second drive motors 27a and 27b are driven at a predetermined number of rotations, and the lower end of the arm 25 is moved forward and the upper end is moved downward to change the inclination angle of the seat back 12 in the front-rear direction. The arm 25 is moved to the set position without executing the program, and the execution of the program ends. As a result, the protector 13 has moved to the set position.

When the first switch 31 is not operated and the second switch 32 is not operated in the auto mode, the third switch
When the switch 33 is in the operating state, the program shifts to a flowchart 434 shown in FIG. 11, and the same flowchart is executed as described above. This allows
An occupant sitting on the seat cushion 11 can easily get off the vehicle by retracting the protector 13 behind. If it is determined in step 43a that the vehicle is not in a stopped state, the arm 25 is moved forward to move the protector 13 to the set position, and the program ends.

In this embodiment, the arm 25 is provided on each of the frame portions 21a and 22a.
4a and 24b, the members for driving the arm 25 are provided in each frame 2
The seats are accommodated in the first and second housings 22a, 22b, and do not cause any obstacles, and the appearance of the seat is clear. In addition, each screw 24
Since a and 24b function as the core material of each frame 21 and 22, the strength of each frame 21 and 22 is improved, and it is particularly advantageous against a load from behind the seat back 12.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an assembly structure of a cushion frame and a back frame constituting a vehicle seat according to one embodiment of the present invention.

FIG. 2 is a perspective view showing the same structure.

FIG. 3 is a cross-sectional view (a) of the same structure in a direction of an arrow aa in FIG. 2 and a cross-sectional view of the same structure in a direction of an arrow bb.

FIG. 4 is a side view showing a state in which the tilt angle is adjusted rearward from the state shown in FIG. 2 in the same structure.

FIG. 5 is a side view showing a retracted position of the arm in the same structure.

FIG. 6 is a side view showing a rearwardly inclined state in the structure.

FIG. 7 is a perspective view of a vehicle seat having the same structure.

FIG. 8 is a schematic block diagram of a control device for the seat.

FIG. 9 is a first flowchart of a program executed by the control device.

FIG. 10 is a second flowchart.

FIG. 11 is a third flowchart.

[Explanation of symbols]

11 ... sheet cushion, 12 ... sheet back, 13 ...
Protector, 14: seat belt, 21: cushion frame, 22: back frame, 24a, 24b: screw, 25: arm (support member), 27a, 27b ...
Drive motor, 30 ... Control device.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kunio Nishiyama 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (56) References JP-A-60-198107 (JP, A) (JP, U) JP-A-2-41834 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B60N 2/00-2/54

Claims (4)

(57) [Claims] A rod-shaped support member is disposed between one of the left and right sides of a back frame constituting a seat back and one of the left and right sides of a cushion frame constituting a seat cushion. In the vehicle seat, the upper end of the support member is attached to the back frame, and the lower end of the support member is attached to the cushion frame so as to be movable in the longitudinal direction of each of the frames. A vehicle seat, wherein each end of the member is configured to be movable independently by each driving means. 2. A control means for controlling the driving of each of the driving means, the control means changing the vertical position and the front and rear positions of the upper and lower ends of the support member without changing the tilt angle of the back frame. The vehicle seat according to claim 1, wherein: 3. A control means for controlling the driving of each of the driving means, wherein the front and rear positions of the lower end of the support member and the upper and lower positions of the upper end of the support member are respectively changed to change the inclination angle of the back frame. The vehicle seat according to claim 1, further comprising control means for changing the vehicle. 4. The back frame as control means for controlling the driving of each of the driving means, by changing the upper and lower positions of the upper end of the support member without changing the front and rear positions of the lower end of the support member. The vehicle seat according to claim 1, further comprising control means for changing a tilt angle of the vehicle.