JP5397883B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat. More particularly, the present invention relates to a vehicle seat that operates so that a headrest can be moved close to a seated person's head when a vehicle rear-end collision is predicted or detected.

  2. Description of the Related Art Conventionally, a vehicle seat having a structure that supports a headrest so that it does not move backward by moving the headrest toward the seated person's head in the event of a vehicle rear-end collision is known. . Here, in Patent Document 1, the headrest is moved close to the seated person's head, triggered by a load that the seated person's back strongly presses against the seat back when a vehicle rear-end collision occurs. A mechanism is disclosed.

In this disclosure, the upper half portion of the seat back is connected to the lower half portion so as to be able to be folded forward and rotated in a folded manner, and when the rear collision of the vehicle occurs, the upper half portion is folded and rotated. As a result, the headrest attached to the upper part of the headrest can be brought closer to the seated person's head.
JP 2004-25939 A

  However, in the conventional technology disclosed above, the headrest moves only forward and can be brought close to the head by turning the seat back in a folded manner, and can be moved close to the height of the head. It has no configuration.

  The present invention has been devised as a solution to the above-described problems, and the problem to be solved by the present invention is to direct the headrest toward the seated person's head when a vehicle rear-end collision is predicted or detected. The object is to make it move closer to a more appropriate position.

In order to solve the above problems, the vehicle seat of the present invention takes the following means.
The first invention, when predicting or detecting a vehicle back-side collision, a vehicle seat operative to be brought close move toward the headrest seat's head. The headrest is attached to the upper part of the seat back. Seat back, and rest the upper back was headrest GaSo wear on top, it is formed to be partitioned and the lower backrest is arranged on the lower side of the upper backrest and vertically. By backside collision is foreseen or detected, backrest upper portion, the driving in broken driving device provided between the lower backrest, brought forward operation on the lower backrest, and headrest The height position relative to the upper back is moved and operated in the height direction close to the head of the seated person by driving the headrest lifting drive. The headrest lifting / lowering drive device is provided in a state where the small gear and the large gear mesh with each other on the base provided on the upper back, and the small gear is sandwiched between the large gear and the small gear by driving rotation of the small gear. The slide pin connected to the arm extending to the side position slides, and the lifting body that supports the headrest connected to the slide pin is operated to move up and down, and the headrest moves in the height direction. Drive control is performed so that the upper backrest of the seat back is completed before the forward tilting movement.

  According to the first aspect of the present invention, the headrest moves toward the front side toward the head of the seated person with the forward tilt movement of the upper back by predicting or detecting the rear collision of the vehicle, Furthermore, it will be in the state which also moved close to the height direction toward the seated person's head by the movement in the height direction of itself. Therefore, the headrest can be moved closer to a more appropriate position toward the seated person's head.

Next, according to a second aspect of the present invention, in the first aspect described above, the headrest lifting / lowering drive device is guided and provided so that the lifting / lowering body moves up and down straight with respect to the base in the height direction of the upper backrest. Tei is a shall.

According to the second aspect of the invention, since the vehicle seat is provided with the folding drive device, the headrest lifting drive device only moves the lifting body up and down straight in the height direction with respect to the upper backrest. Simple configuration. Therefore, the lifting body can be smoothly lifted and lowered by guiding the lifting body so as to be lifted and lowered straight in the height direction with respect to the base provided on the upper back .

  Next, according to a third aspect, in the first or second aspect described above, the headrest lifting / lowering driving device and the middle-folding driving device are configured so that the upper backrest of the headrest is at a normal time before a vehicle rear-end collision is predicted or detected. As a driving device for adjusting the height position relative to the height position of the seated person's head, or by tilting the posture of the upper backrest to the lower backrest, the shape of the backrest surface of the seat back It is the structure used as a drive device for adjusting to a desired half-bent shape.

  According to the third aspect of the invention, the folding drive device and the headrest lifting drive device that perform the function of moving the headrest close to the head at the time of prediction or detection of the rear collision of the vehicle are normally at the height position of the headrest. And a drive device for adjusting the backrest surface shape of the seat back to a desired bent shape. Therefore, these drive devices can be used for general purposes.

  Next, in a fourth aspect based on the third aspect described above, the headrest lifting / lowering driving device is configured such that the speed at which the headrest is moved in the height direction is a speed at which a vehicle rear-end collision is predicted or detected rather than normal. The drive is controlled so that the higher is higher.

  According to the fourth aspect of the invention, it is possible to easily adjust the height of the headrest by normally moving the headrest in the height direction at a relatively slow speed. In addition, when the rear collision of the vehicle is predicted or detected, the headrest is moved at a relatively high speed, so that the headrest can be quickly moved to the collision corresponding position.

  Embodiments of the best mode for carrying out the present invention will be described below with reference to the drawings.

  First, the configuration of the vehicle seat 1 according to the first embodiment will be described with reference to FIGS. As shown in FIG. 1, the vehicle seat 1 includes a seat back 2 that serves as a backrest, a seat cushion 3 that serves as a seating portion, and a headrest 4 that serves as a headrest. The vehicle seat 1 is normally held in a state where the components such as the backrest and the head rest are fixed in position, but a vehicle rear-end collision is predicted or detected by an in-vehicle sensor (not shown). Thus, the headrest 4 is operated so as to move closer to the head of the seated person, and the head is supported so that the head does not move backward.

  Here, the above-described seat back 2 is formed by being vertically divided into an upper backrest 2A with the headrest 4 mounted on the upper portion and a lower backrest 2B disposed on the lower side of the upper backrest 2A. ing. The former upper back 2A is provided with a lower end portion thereof rotatably hinged to an upper end portion of the lower back portion 2B, and is normally a middle-fold drive device provided between the lower back portion 2B and the lower back portion 2B. Since the drive of 20 is stopped, the posture with respect to the lower backrest 2B is fixed. On the other hand, the lower backrest 2B of the latter is connected to the rear end portion of the seat cushion 3 so that the backrest angle can be adjusted via a reclining device (not shown).

  The upper backrest 2A described above is always held in a posture state in which the backrest surface on the front side is flush with the backrest surface of the lower backrest 2B before the vehicle rear-end collision is predicted or detected. Yes. Then, the upper backrest 2A is moved or operated in a direction to be tilted forward with respect to the lower backrest 2B by the driving of the above-described middle folding drive device 20 by predicting or detecting a rear collision of the vehicle. The headrest 4 attached to the head is moved close to the front side toward the head of the seated person.

  Further, in the configuration of the present embodiment, the headrest 4 is driven by the headrest lifting / lowering drive device 10 provided inside the upper backrest 2A in accordance with the above-described middle-folding rotation (forward rotation) of the upper backrest 2A. The mounting position with respect to the upper backrest 2A is raised in the height direction so as to be close to the head of the seated person. As a result, the upper backrest 2A is brought closer to the back of the seated person and the headrest 4 is moved to the back of the head of the seated person with respect to the seated person who is in a posture in which the back part floats forward from the upper backrest 2A. Can be approached.

  Hereinafter, specific configurations of the seat back 2 and the headrest 4 will be described in detail. First, the configuration of the seat back 2 will be described. That is, as shown in FIG. 2, the skeleton of the seat back 2 is configured by assembling the upper frame 2Aa forming the skeleton of the upper backrest 2A and the lower frame 2Ba forming the skeleton of the lower backrest 2B vertically. Has been. Specifically, the upper frame 2Aa is formed by bending a steel pipe into an inverted U-shape, and a horizontally long reinforcing plate 2Ab made of a steel plate is bridged between both side frames to be rigidly coupled. It is assembled in a square frame shape.

  The upper frame 2Aa has two holders 2C, which serve as holding portions for the supports 2D, 2D, which are provided as guide members for inserting both legs of the stay 4A, which will be a column of the headrest 4, which will be described later. 2C is bonded and fixed. These holders 2C and 2C are formed in a rectangular tube shape, and are integrally mounted by inserting the supports 2D and 2D into the tubes from above.

  Then, the leg portions of the stay 4A are inserted into the cylinders of the supports 2D and 2D mounted in the holders 2C and 2C, respectively, so that both the leg portions are respectively arranged at the lower side positions. The headrest lifting / lowering drive device 10 described later is mounted and supported. On the other hand, the lower frame 2Ba is formed by bending a steel pipe into a substantially U shape, and a horizontally long reinforcing plate 2Bb made of a steel plate is bridged between both side frames to be rigidly coupled. It is assembled in a frame shape.

  The lower ends of both side frames of the upper frame 2Aa are hingedly connected to the upper ends of both side frames of the lower frame 2Ba through brackets. By this hinge connection, the upper backrest 2A is in a state in which the upper backrest 2A can be rotated around the center folding center R with respect to the lower backrest 2B. The backrest angle of the upper backrest 2A with respect to the lower backrest 2B is determined by the drive position of the middle-fold drive device 20 provided between them.

  Here, the folding drive device 20 includes a drive unit 21 that generates a rotational driving force by driving an electric motor, a ball screw 22 that is connected to the drive unit 21 and is directly operated in the vertical direction in the figure, and the ball screw 22. And a slide pin 23 connected to the upper end of the. Specifically, the drive unit 21 is fixed to a fixed plate 2Bc formed to extend rearward from the reinforcing plate 2Bb spanned over the lower frame 2Ba described above.

  The drive unit 21 receives a drive signal from a control device (not shown) so that a nut (not shown) that is screwed and connected to the ball screw 22 is driven to rotate in both forward and reverse directions. Yes. As shown in FIGS. 5 to 6, the ball screw 22 has an upper end portion extending from the reinforcing plate 2 </ b> Ab spanned over the upper frame 2 </ b> Aa to the rear side to the operation plate 2 </ b> Ad formed. They are connected by a slide pin 23.

  Specifically, the slide pin 23 is provided by being fitted in a long hole dh that is formed through the operation plate 2Ad, and is in a state in which it can slide within the shape of the long hole dh. As a result, the ball screw 22 described above is configured to push the slide pin 23 up and down in the vertical direction when a rotational force is input by the rotational drive of the nut in the drive unit 21, and to move up and down straight in the axial direction without rotation. It is designed to be moved.

  As the ball screw 22 is driven, as shown in FIG. 6, the upper frame 2Aa is rotated about the center of the center frame R with respect to the lower frame 2Ba. . The upper frame 2 </ b> Aa is held in the angular position state in which the upper frame 2 </ b> Aa is rotated by the braking action of the device when the driving of the folding drive device 20 is stopped. Further, the upper frame 2Aa is returned from this state toward the rotational position before the middle turn as shown in FIG. 5 when the ball screw 22 is rotated in the direction opposite to the above. It has come to go.

  Next, returning to FIG. 2, the configuration of the headrest lifting drive device 10 will be described. The headrest lifting / lowering driving device 10 is provided by being attached to a mounting plate 2Ac fixed to the back surface portion of the upper frame of the upper frame 2Aa. The headrest lifting drive device 10 includes a main body 11 serving as a base, a lifting body 12 that moves up and down relative to the main body 11, a large gear 13 and a small gear 15 that transmit a lifting driving force to the lifting body 12, And a drive unit 14 that rotationally drives the small gear 15 by driving an electric motor (not shown).

  Specifically, the main body 11 is integrally attached and fixed to a mounting plate 2Ac fixedly installed on the back surface of the upper frame of the upper frame 2Aa. As shown in FIGS. 3 to 4, the elevating body 12 is assembled to the main body 11, so that the elevating movement is guided by the guide rails 11 </ b> B and 11 </ b> B formed on both sides of the main body 11. It is assembled in a state to be. Here, mounting holes 12A and 12A through which both legs of the stay 4A serving as the support of the headrest 4 described above can be inserted and mounted are formed through both sides of the lifting body 12.

  Locking rings 12B and 12B are provided on both sides of the lifting body 12 in which the mounting holes 12A and 12A are formed. The locking rings 12B and 12B are hooked so as to partially protrude into the holes of the mounting holes 12A and 12A. It has been. The locking rings 12B and 12B are elastically formed in notch grooves (not shown) formed in the legs of the stay 4A by inserting the legs of the stay 4A into the holes of the mounting holes 12A and 12A. The stay 4 </ b> A is held in a state where it is attached to the lifting body 12 by engaging and engaging with each other to lock the movement of each leg in the insertion direction.

  Next, the large gear 13 is rotatably connected to the main body 11 by a connecting shaft 13A. The large gear 13 has tooth portions 13 </ b> C that mesh with the small gear 15 on the outer peripheral surface of the fan-shaped surface portion. A long hole 13 </ b> B extending in an arc shape drawn around the connecting shaft 13 </ b> A is formed in the fan-shaped surface portion of the large gear 13. And in this long hole 13B, it is in the state by which the fixing pin 11C fixedly installed in the main body 11 was engage | inserted.

  As a result, the large gear 13 is rotated as the small gear 15 is driven to rotate, and the fixed pin 11C rotates while contacting the upper end (see FIG. 5) or the lower end (see FIG. 6) of the long hole 13B. Within the angular region, the rotational movement can be performed in both forward and reverse directions. The large gear 13 is formed with an arm that extends greatly in a curved shape, and a slide pin 13D is formed in a long hole 11A extending in an arc shape formed in the main body 11 at the tip of the arm. It is provided in a fitted state.

  Here, the long hole 11 </ b> A formed in the main body 11 is formed to extend in an arc shape drawn around the connecting shaft 13 </ b> A of the large gear 13 described above. As a result, the slide pin 13D can slide up and down inside the hole shape of the long hole 11A as the large gear 13 rotates. And this slide pin 13D is connected with respect to the slide piece 12C provided so that it can slide only with respect to the raising / lowering body 12 to the left-right direction of illustration, and an axial rotation is possible.

  As a result, the lifting body 12 is moved up and down by the slide pin 13D as the slide pin 13D slides up and down in the long hole 11A by the rotational movement of the large gear 13. ing. When the lifting body 12 is moved up and down, the mounting position of the headrest 4 attached to the lifting body 12 is moved in the height direction. Next, the small gear 15 is provided in a state in which the small gear 15 is engaged with the tooth portion 13C of the large gear 13 described above as a state in which the small gear 15 is rotatably connected to the main body 11 by the connecting shaft 15A.

  The small gear 15 is formed integrally with the connecting shaft 15A. The connecting shaft 15A is connected to the drive unit 14 and is rotationally driven by the drive unit 14. The drive unit 14 is configured to rotationally drive the connecting shaft 15A by driving an electric motor (not shown), and when the drive is stopped, the small gear 15 is held in the rotationally operated position state by the braking action. It is supposed to be.

  Here, the drive unit 14 is driven and operated by appropriately operating an operation switch (not shown) provided on the vehicle seat 1 at a normal time before the vehicle rear-end collision is predicted or detected. The small gear 15 is rotationally driven in the forward direction or the reverse direction so that the adjustment operation of the mounting height position of the headrest 4 can be performed. Further, when the rear-end collision of the vehicle is predicted or detected by the above-described on-vehicle sensor, the driving unit 14 causes the headrest 4 to be attached to the seated person by driving control of a control device (not shown) based on an input signal from the on-vehicle sensor. It is designed to move in the height direction so as to be close to the head.

  At this time, the drive speed of the electric motor is such that the speed at which the drive unit 14 moves the headrest 4 in the height direction is higher than the speed at which the headrest 4 is moved by operating the operation switch at normal times. To be controlled. Specifically, the control for changing the drive speed of the electric motor is, for example, known PWM (Pulse Width Modulation) control (controlling the voltage applied to the electric motor to increase or decrease the rotation speed of the electric motor. Control).

  Therefore, the drive control of the drive unit 14 described above makes it possible to adjust the height of the headrest 4 so that the height position of the headrest 4 can be adjusted at a relatively moderate speed during normal times. Further, at the time of prediction or detection of a rear collision of the vehicle, the headrest 4 can be quickly moved to a collision-corresponding position close to the head by causing the headrest 4 to move in the height direction at a relatively high speed.

  Returning to FIG. 1, when the headrest 4 is moved close to the seated person's head as described above, a capacitive sensor (not shown) provided with the head position of the seated person inside the headrest 4. The headrest 4 is controlled to operate in such a manner that the moving direction and the moving amount of the headrest 4 are determined based on the detection signal.

  The above-described folding driving device 20 is also driven by appropriately operating an operation switch (not shown) provided on the vehicle seat 1 by a seated person at a normal time before the vehicle rear-end collision is predicted or detected. It is designed to be operated. Since the upper backrest 2A of the seat back 2 is configured to be rotationally driven within a relatively wide rotation angle region, the middle folding drive device 20 is configured so that the upper backrest can be driven at a relatively high driving speed even during normal times. 2A is bent and rotated. Therefore, the upper backrest 2A can be quickly moved to the collision corresponding position in the vicinity of the back of the seated person at the time of prediction or detection of the rear collision of the vehicle.

  Therefore, when the rear collision of the vehicle is predicted or detected, the seat back 2 and the headrest 4 described above are operated and operated in the following manner, for example. For example, as shown in the figure, normally, the upper backrest 2A of the seat back 2 is in a state where the seatback 2 is not bent and rotated, and the height position of the headrest 4 is lowered to the lower limit position. Usually, a seated occupant using the headrest 4 at the lower height position is seated and used on the vehicle seat 1 in a posture in which the body is lifted forward from the upper backrest 2A. And

  Then, from this state, when the rear collision of the vehicle is predicted or detected, the headrest lifting drive device 10 and the folding drive device 20 are respectively driven to move the headrest 4 close to the seated person's head. Accordingly, the mounting height position of the headrest 4 is raised upward, and the upper backrest 2A is bent and rotated with respect to the lower backrest 2B, so that the headrest 4 is moved forward.

  At this time, the movement in which the mounting height position of the headrest 4 is raised is performed at a higher speed than the movement in which the upper backrest 2A is bent and rotated, and the movement in which the height position of the headrest 4 is raised is completed earlier. Thus, operation control is performed by a control device (not shown). Thereby, after making the height position of the headrest 4 match the height of the head position, the headrest 4 can be moved closer to the front side toward the head.

  Here, when the rear collision of the vehicle occurs, the seated person is pressed against the seat back 2 in the rearward tilted posture by the spring, and the back portion is shifted upward along the inclined shape of the seat back 2. May be in a raised posture. Therefore, the state in which the height position of the headrest 4 is adjusted to the height of the head position that has been raised by the operation being controlled so as to complete the movement of the headrest 4 in the height direction first. Then, the headrest 4 can be moved closer to the front side toward the head, and the headrest 4 can be moved closer to a more appropriate position toward the head of the seated person.

  Thus, according to the vehicle seat 1 of the present embodiment, the headrest 4 is seated in accordance with the forward tilting movement (center-turning rotation) of the upper backrest 2A by predicting or detecting the rearward collision of the vehicle. It moves toward the front side toward the person's head, and further moves toward the head direction of the seated person by moving in the height direction of the person. Therefore, the headrest 4 can be moved closer to a more appropriate position toward the seated person's head.

  In addition, the folding drive device 20 and the headrest lifting drive device 10 that perform the function of moving the headrest 4 close to the head at the time of prediction or detection of a rear collision of the vehicle adjust the height position of the headrest 4 in normal times. Or the backrest surface of the seat back 2 is used as a driving device for adjusting the shape of the seat back 2 to a desired bent shape. Therefore, these drive devices can be used for general purposes.

  As mentioned above, although the embodiment of the present invention has been described using one example, the present invention can be implemented in various forms in addition to the above example. For example, at the time of prediction or detection of a rear collision of the vehicle, each driving timing of the driving in the height direction of the seat back 2 by the headrest raising / lowering driving device 10 and the middle folding drive of the upper backrest 2A of the seat back 2 by the middle folding driving device 20 Is not particularly limited. In other words, the driving of the other may be started after one of the driving is completed, or both of them are driven at the same time, and the amount of movement is not limited to the end of the completion timing. The driving may be completed appropriately according to the movement time according to the above.

  Moreover, in the said Example, although the operation control was carried out so that the headrest 4 might be raised from a lower limit position at the time of the prediction or detection of a vehicle rear collision, normally, the headrest 4 is an upper limit. When the headrest 4 is used at a position where the height position of the headrest 4 is set higher than the head position, the head position detection signal is used when the vehicle rear-end collision is predicted or detected. It goes without saying that the operation control is performed so as to lower the height position of the headrest 4 based on the above.

  Similarly to the headrest lifting / lowering drive device 10, the folding drive device 20 can also control the upper backrest 2A at a higher speed than usual when predicting or detecting a vehicle rear-end collision by controlling the drive speed such as PWM control. The drive may be controlled so that it can be bent and rotated.

1 is a side view illustrating a schematic configuration of a vehicle seat according to a first embodiment. It is a disassembled perspective view showing the internal structure of a seat back. It is a top view showing the structure of the headrest raising / lowering drive device. It is a top view showing the state which the raising / lowering body moved to the upper side. It is a schematic diagram showing the normal state of a seat back and a headrest. It is the model showing the state which the seat back and the headrest moved to the collision corresponding position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat back 2A Upper back 2Aa Upper frame 2Ab Reinforcement plate 2Ac Mounting plate 2Ad Operation plate dh Long hole 2B Lower back 2Ba Lower frame 2Bb Reinforcement plate 2Bc Fixing plate 2C Holder 2D Support 3 Seat cushion 4 Headrest 4A Stay DESCRIPTION OF SYMBOLS 10 Headrest raising / lowering drive apparatus 11 Main body 11A Long hole 11B Guide rail 11C Fixed pin 12 Lifting body 12A Mounting hole 12B Locking ring 12C Slide piece 13 Large gear 13A Connecting shaft 13B Long hole 13C Tooth part 13D Slide pin 14 Drive part 15 Small gear 15A Connecting shaft 20 Middle-folding drive device 21 Drive unit 22 Ball screw 23 Slide pin R Center-folding center

Claims (4)

A vehicle seat that operates so that a headrest can be moved close to a seated person's head when a rear-end collision is predicted or detected,
Forming the headrest is mounted on the upper portion of the seat back, the seat back is divided into upper and lower O to rest the lower back which is arranged in the lower part of the headrest GaSo wear by upper backrest and the upper backrest on top It is, brought forward operation on the lower backrest by a drive of the drive unit broken in that provided between the front SL upper portion backrest said lower backrest by the vehicle back-side collision is foreseen or detected and is adapted to be operated to move the height direction to be closer to the head of the seated person by the drive of the height to the upper backrest headrest elevation drive system of the headrest,
The headrest raising / lowering drive device is provided in a state where a small gear and a large gear mesh with each other on a base provided on the upper backrest, and the small gear shifts from the large gear to the small gear by driving rotation of the small gear. The slide pin connected to the arm extending to the opposite side across the slide slides, and the lifting body supporting the headrest connected to the slide pin is configured to be moved up and down. A vehicle seat characterized in that drive control is performed so that the movement in the height direction is completed before the forward tilt movement of the upper back of the seat back . The vehicle seat according to claim 1,
The headrest elevation drive device for a vehicle seat, wherein Rukoto said lifting body has been guide provided so as to operate straight up and down in the height direction of the upper backrest relative to the base. The vehicle seat according to claim 1 or 2,
The headrest lifting / lowering driving device and the middle-folding driving device adjust the height position of the headrest with respect to the upper back of the headrest to the height position of the seated person's head at a normal time before a vehicle rear-end collision is predicted or detected. Or a drive device for adjusting the shape of the backrest surface of the seat back to a desired bent shape by tilting the posture of the upper back against the lower back. A vehicle seat characterized by that. The vehicle seat according to claim 3,
The headrest raising / lowering driving device is drive-controlled so that the speed at which the headrest is moved in the height direction is higher when the vehicle rear-end collision is predicted or detected than during normal time. Sheet.

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