JP2005271861A - Seat structure for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a whiplash injury by sufficiently ensuring a front movement amount of a head rest at rear collision by rear-ending. <P>SOLUTION: A rotation shaft 8 is penetrated through both left and right sides of an upper part of an outer seat part 2 and an upper part of an inner seat part 3 and a lower part 9 of the inner seat part 3 can be moved in a longitudinal direction of a vehicle body. When load F1 is applied at the rear collision of the automobile, the lower part 9 of the inner seat part 3 is moved to a rear side of the vehicle body by load F2 of an occupant and the head rest 5 is simultaneously pivoted to a front side of the vehicle body. The head part H of the occupant is supported by the head rest 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an automobile seat structure, and more particularly to an automobile seat structure having a function of protecting an occupant during a rear collision such as a rear-end collision.

  As a conventional automobile seat structure, for example, one disclosed in Patent Document 1 is known.

In this automobile seat gazette, a pressure receiving plate that supports the back of the occupant is provided inside the seat back, the pressure receiving plate and the headrest are connected by a link, and the pressure receiving plate rotates according to the weight of the occupant when a rear collision occurs. Sometimes, a structure in which the headrest is moved forward via a link is disclosed.
JP 2001-287579 A

  However, in the above-described automobile seat, if there is a gap between the occupant and the seat or the vertical displacement of the pressure receiving plate and the back due to the size or posture of the occupant's body, There was a problem that the input to the pressure receiving plate supporting the movement was delayed, and the forward movement of the headrest supporting the head was delayed.

  Therefore, if the pressure plate is expanded in the vertical direction, the pressure plate can be pushed backward by the input from the occupant's waist even if there is a difference in body shape or chest space, but the pressure plate is provided inside the seat. Then, there is a problem in that the amount of backward movement is limited in the space below the pressure receiving plate, and the amount of forward movement of the headrest at the time of collision is smaller than the current amount.

  The present invention has been made paying attention to such a problem, and an object of the present invention is to prevent whiplash by ensuring a sufficient amount of forward movement of the headrest in a rear collision caused by a rear-end collision.

  In order to solve the above-described problem, the seat structure of the first automobile of the present application includes a seat back that supports the back of an occupant, an outer seat portion that forms an outer peripheral edge portion of the seat back, and an inner side of the seat back. An inner seat portion, the inner seat portion is disposed inside the outer seat portion, a headrest is provided on the inner seat portion to support the head of an occupant, and the lower portion of the inner seat portion The upper seat portion and the lower portion of the headrest are supported by the outer seat portion so that the outer seat portion can move in the direction.

  In the seat structure of the second automobile of the present application, in the seat structure of the first automobile, a lock pin that locks both of the outer seat portion and the inner seat portion is provided, and the outer seat portion and the A pin receiving means for the lock pin is provided on the other side of the inner sheet portion, and the lock pin and the pin receiving means are locked to at least one of the lock pin and the pin receiving means at a normal time, and the lock is applied at the time of a rear collision. An unlocking mechanism for unlocking the pin and the pin receiving means is provided.

  The seat structure of the third automobile of the present application is the seat structure of either the first or second automobile, and the unlocking mechanism is stretched inside the inner seat portion so as to support the back of the occupant, It is characterized by comprising at least one or more wires capable of moving the lock pin in a direction away from the pin receiving means.

  The fourth automobile seat structure of the present application is the first or second automobile seat structure, wherein the unlocking mechanism is installed in either the automobile body or the automobile seat to prevent the rear collision. A sensor for detecting, and a separation device for separating the lock pin from the pin receiving means based on a rear collision detection output of the sensor when the sensor detects the rear collision. .

  According to a fifth automobile seat structure of the present application, in the second to fourth automobile seat structures, the lock pin, the pin receiving means, and the lock release mechanism allow the lock to be locked again after the lock pin is unlocked. It has a restoration mechanism.

  According to the seat structure of the first automobile, the lower part of the inner seat part provided with the headrest is rotatable in the longitudinal direction of the vehicle body. Since the headrest swings forward of the vehicle body and the occupant's head is supported by the headrest, whipping is prevented.

  According to the seat structure of the second automobile, the lock pin and the pin receiving means are normally locked to lock the inner seat portion and the outer seat portion. By releasing the lock with the outer seat part, the lower part of the inner seat part swings rearward of the vehicle body, and at the same time, the headrest swings forward of the vehicle body to support the occupant's head, thereby preventing whipping. .

  According to the seat structure of the third automobile, the wire stretched on the inner seat portion at the time of rear-end collision is pushed and extended by the back of the occupant trying to move rearward of the vehicle body, and the lock pin is detached from the pin receiving means. In addition, the lower part of the inner seat portion swings rearward of the vehicle body, and at the same time, the headrest swings forward of the vehicle body to support the occupant's head, thereby preventing whipping. Further, since the wire directly detects the rearward movement of the occupant's back, the head is quickly supported.

  According to the seat structure of the fourth automobile, the rear collision is detected by the sensor and the lock between the lock pin and the pin receiving means is released. It can swing to support the occupant's head, can prevent whiplash, and the rear collision detection mechanism becomes compact.

  According to the seat structure of the fifth automobile, the inner seat portion and the outer seat portion can be locked again after the rear impact and can be used again.

  Hereinafter, the best mode for carrying out the present invention will be described based on examples.

  FIG. 1 is a diagram showing a main part of a vehicle seat structure according to an embodiment of the present invention.

  1 to 4, reference numeral 1 is, for example, a seat back of a driver's seat of an automobile. The seat back 1 includes an outer seat portion 2 constituting an outer peripheral edge portion of the seat back 1 and an inner side of the seat back 1. The outer sheet portion 2 has an opening 4 (see FIG. 5) in which the inner sheet portion 3 is disposed. An inner sheet portion 3 is disposed in the opening 4. A headrest 5 that supports an occupant's head H is installed at the upper part of the inner seat part 3, and an opening 7 (see FIG. 5) through which the stay 6 (see FIG. 3) of the headrest 5 passes. ) Is formed. The opening 7 is a long hole extending in the longitudinal direction of the vehicle body, and enables the headrest 5 to swing in the longitudinal direction. The stay 6 of the headrest 5 is passed through the upper part of the frame 11, and the stay 6 is held by a cylindrical portion 6A whose height can be adjusted in the vertical direction.

  A rotating shaft 8 is passed through the left and right sides of the upper portion of the outer seat portion 2 and the upper portion of the inner seat portion 3 so that the lower portion 9 of the inner seat portion 3 can move in the longitudinal direction of the vehicle body. . Both end portions of the rotating shaft 8 protrude on both sides of the frame 10 of the outer sheet portion 2 and are stopped by a flange portion 8A and a nut 8B.

  As shown in FIG. 2, when a load F1 is applied at the time of rear-end collision of the automobile, the lower portion 9 of the inner seat portion 3 is moved rearward by the passenger's load F2, and at the same time, the headrest 5 swings forward of the vehicle body. Since the head H of the occupant is supported by the headrest 5, whipping of the occupant is prevented.

  As shown in the frame configuration of FIG. 3, a frame 10 of the outer sheet portion 2 and a frame 11 of the inner sheet portion 3 are provided inside the outer sheet portion 2 and the inner sheet portion 3. Lower end portions on both the left and right sides of the frame 10 are attached to the frame 14 of the seat cushion 13 via the attachment plate 12 so that the angle can be adjusted.

  The frame 11 of the inner seat portion 3 is installed inside the frame 10 of the outer seat portion 2. A rotating shaft 8 is passed through the upper part of the frame 11 of the inner seat part 3 and the upper part of the frame 10 of the outer seat part 2, and the lower part of the frame 11 can swing in the vehicle longitudinal direction with respect to the frame 10. Has been.

  Further, a lock pin 15 is passed through the lower portion of the frame 11, and a pin hole 16 serving as a pin receiving means on the lower portion of the frame 10 of the outer seat portion 2 is opened at the lower portion of the lock pin 15. . The tip of the lock pin 15 can be inserted into or removed from the pin hole 16. When the lock pin 15 is inserted into the pin hole 16, the frame 11 cannot swing from the frame 10 in the longitudinal direction of the vehicle body. When the lock pin 15 is detached from the pin hole 16, the frame 11 is removed from the frame 10. It can swing in the longitudinal direction of the vehicle body.

  As shown in FIGS. 4 and 6, the lock pin 15 has a rod-like tip at the pin hole 16 side, and has a flange 17 on the opposite side of the pin hole 16. The distal end portion of the lock pin 15 is slidably held by the first cylindrical portion 18 and is prevented from falling off from the first cylindrical portion 18 by the flange portion 17. A guide shaft 19 protrudes from the rear portion of the lock pin 15, and a hook portion 20 is formed at the rear end portion of the guide shaft 19. The guide shaft 19 is passed through the coil spring 21, and the coil spring 21 is stored in the second cylindrical portion 22.

  One end of the coil spring 21 is in contact with the flange portion 17 of the lock pin 15, and the other end of the coil spring 21 is supported by the lid portion 23 of the second cylindrical portion 22. The lock pin 15 is urged by the coil spring 21 to the pin hole 16 side which is the direction of the tip portion. The coil spring 21 constitutes a restoring mechanism that allows the lock pin 15 to be locked again by inserting the lock pin 15 into the pin hole 16 after the lock pin 15 is unlocked.

  The lid portion 23 has a third cylindrical portion 24, and the hook portion 20 is located in the third cylindrical portion 24. A nut portion 26 of a wire cable 25 is screwed to the third cylindrical portion 24. A cylindrical hooking portion 28 is fixed to the hook portion 20 at the terminal portion on the lock pin 15 side of the wire 27 of the wire cable 25, and the hooking portion 28 is held by the hook portion 20. . The hook portion 20 has a shape surrounding the outer periphery of the hook portion 28, and has a recess 29 through which the wire 27 is passed.

  As shown in FIG. 4, the distal end portion of the lock pin 15 is normally inserted into the pin hole 16 of the frame 10 of the outer seat portion 2, and the frame 11 is not movable in the longitudinal direction of the vehicle body with respect to the frame 10. ing. The nut portion 26 of the wire cable 25 is fixed to the mounting hole 30 of the frame 11. The wire cable 25 extends from the attachment hole 30 of the frame 11 to the through hole 31 opened in the middle part of the frame 11. A nut portion 32 at the end of the wire cable 25 is fixed to the through hole 31 of the frame 11.

  The wire 27 of the wire cable 25 constitutes an unlocking mechanism for unlocking the lock pin 15 and the pin hole 16 (pin receiving means) at the time of rear collision. The wire 27 extends from the middle portion of the right side portion 11R of FIG. 3 to the middle portion of the left side portion 11L of FIG. 3, and is stretched in a state where it is pulled to a position capable of supporting the substantially central portion of the passenger's back. Yes.

  A through hole for the wire 27 is opened in the left portion 11L of the frame 11, and a cylindrical guide 33 is attached to the through hole. The wire 27 passes through the guide 33 and extends to the outside of the left side portion 11L, and the end portion of the left side portion 11L of the wire 27 is wound around and fixed to the fixing pin 34 of the left side portion 11L. The coil 27 is in a state where the wire 27 is pulled between the left and right portions 11R and 11L of the frame 11, and when the occupant is seated on the inner seat portion 3, the wire 27 slightly loosens. The tip of the lock pin 15 can be kept inserted in the pin hole 16. Further, at the time of rear collision, the wire 27 is pulled rearward by the acceleration force acting on the rear side of the vehicle body and the load applied from the back of the occupant, and the distal end portion of the lock pin 15 resists the biasing force of the coil spring 21 from the pin hole 16. The length of the wire 27 and the lock pin 15 and the insertion depth of the lock pin 15 into the pin hole 16 are set so as to be detached.

  A pair of Sin-curved springs 35 are stretched vertically between the left and right portions 11R, 11L of the frame 11 of the inner seat portion 3. The elastic force of the spring 35 supports the occupant's back comfortably without causing the lock pin 15 to be detached from the pin hole 16 in a normal state where no rear collision occurs, and pulls the wire 27 to lock when the rear collision occurs. The pin 15 is strong enough to be removed from the pin hole 16. Further, the spring 35 is installed so as to be positioned slightly forward of the vehicle body from the wire 27.

  FIG. 7 shows a state in which a plurality of wires 27 are stretched on the frame 11, and the lock pin 15 can be removed from the pin hole 16 at the time of a rear collision regardless of the height of the occupant. Further, the upper and lower three wires 27 are passed through the respective wire cables 25, and the terminal portions of the left side portion 11 </ b> L of the upper and lower three wires 27 are respectively fixed to the fixing pins 34. Each end portion of the right portion 11R of the three wires 27 is gathered into one in front of the nut portion 26 in FIG. 6, and any of the three wires 27 is bent to detect a rear collision. The lock pin 15 can be pulled. The other configurations are the same as those described with reference to FIGS.

  1 to 7, the upper part of the inner seat part 3 having the headrest 5 and the lower part of the headrest 5 are fixed to the outer seat part 2 by the rotating shaft 8, Since the lower part 9 of the seat part 3 is pivotable in the longitudinal direction of the vehicle body, the headrest 5 swings forward of the vehicle body at the same time as the lower part 9 of the inner seat part 3 swings rearward of the vehicle body at the time of a rear collision.

  That is, normally, the lock pin 15 and the pin hole 16 are locked to lock the inner seat portion 3 and the outer seat portion 2, and the wire 27 stretched laterally of the inner seat portion 3 is rearward of the vehicle body at the time of a rear collision. Since the wire 27 is stretched by being pushed by the back of the occupant who wants to move, the lock pin 15 is released from the pin hole 16 and the lock between the inner seat portion 3 and the outer seat portion 2 is released, and the inner seat The lower part 9 of the part 3 moves to the rear of the vehicle body, and the headrest 5 moves to the front of the vehicle body. As a result, the occupant's head H is supported by the headrest 5, so that whiplash is prevented. Further, since the wire 27 directly detects the rearward movement of the occupant's back, the head H is supported quickly.

  The wire 27 may be stretched in the vertical direction or the horizontal and vertical direction of the frame 11.

  Further, in the above-described embodiment, the lock pin 15 is provided in the frame 11 of the inner seat portion 3 and the pin hole 16 is formed in the frame 10 of the outer seat portion 2, but the lock pin 15 is provided on the frame 10 side. The pin hole 16 may be formed on the frame 11 side. The mounting position of the lock pin 15 may be a lower part on the floor side of the frame 10, and the pin hole 16 may be a lower part of the frame 11.

  In this case, in order to pull out the lock pin 15 from the pin hole 16, the end portion of the wire 27 of the frame 11 is connected to the lock pin 15 on the frame 10 side, but in order to pull out the lock pin 15 from the pin hole 16. Is provided with a pendulum that swings in the longitudinal direction of the vehicle body on the outer frame 10 and a link mechanism that transmits the swing of the pendulum to the lock pin 15 to link the forward movement of the pendulum at the time of a rear collision. It may be configured to transmit to the lock pin 15 through a mechanism and to pull out the lock pin 15 from the pin hole 16.

  FIG. 8 shows another configuration example for detaching the lock pin from the pin receiving means. In this example, the lock pin is constituted by the movable iron core 4OA of the electromagnetic solenoid 40 shown in FIG. 10, and the sensor for detecting the rear collision is constituted by the switch 41 shown in FIG. The switch 41 and the electromagnetic solenoid 40 constitute a lock release mechanism for releasing the lock between the movable iron core 40A (lock pin) and the pin hole 16 (pin receiving means) at the time of rear collision.

  In the switch 41, an iron movable contact 43 is provided in a cylindrical portion 42 made of a non-magnetic metal or resin or the like so as to be movable left and right. A permanent magnet 44 is attached to one end of the cylindrical portion 42. Fixed contacts 45 </ b> A and 45 </ b> B are arranged on the opposite side of the cylindrical portion 42 to the permanent magnet 44. The fixed contacts 45A and 45B are brought into conduction when the movable contact 44 comes into contact therewith. The fixed contact 45A is connected to a power source, the fixed contact 45B is connected to a control circuit (for example, a relay circuit) of a control box (not shown), and when the fixed contacts 45A and 45B are connected to each other, The occurrence of a collision is output as a signal, and the control circuit applies a current to the electromagnetic solenoid 40 to pull back the movable iron core 40A.

  The cylindrical portion 42 is installed on the right portion 11R of the frame 11 of the inner seat portion 3 so that the axial direction of the cylinder is directed in the longitudinal direction of the vehicle body, but may be attached to the vehicle body. In normal times, the movable contact 43 is attracted to the permanent magnet 44.

  FIG. 10 shows the electromagnetic solenoid 40. The electromagnetic solenoid 40 constitutes a detaching device for detaching the movable iron core 40A (lock pin) from the pin hole 16 based on the rear collision detection output of the switch 41 when the switch 41 as a sensor detects the rear collision. .

  The electromagnetic solenoid 40 normally has a movable iron core 40A protruding, and is a pull type that pulls in the movable iron core 40A when a drive current is applied to an internal coil. An opening 46 is formed at a portion corresponding to the pin hole 16 of the frame 11, and the electromagnetic solenoid 40 is fixed inside the opening 46 by screws. In a normal state, the movable iron core 40A of the electromagnetic solenoid 40 is passed through the pin hole 16, and the frame 10 and the frame 11 are locked.

  FIG. 11 shows an operation process of the switch 41 and the electromagnetic solenoid 40 at the time of rear collision. When a rear collision occurs in which the succeeding vehicle collides with the rear portion of the vehicle body, the movable contact 43 is separated from the permanent magnet 44 by the impact load F1 (see FIG. 2) and contacts the fixed contacts 45A and 45B. Due to the contact of the movable contact 43, the fixed contacts 45A and 45B become conductive, the switch 41 is turned on, and a rear collision is detected. The current flowing through the fixed contacts 45A and 45B conducted by the contact of the movable contact 43 of the switch 41 is input to the control circuit, and the control circuit drives the electromagnetic solenoid 40 to pull out the movable iron core 40A from the pin hole 16. Supply. When the control circuit supplies a drive current to the electromagnetic solenoid 40, the coil in the electromagnetic solenoid 40 is excited and the movable iron core 40 </ b> A is pulled out from the pin hole 16.

  As a result, the lock between the frame 11 and the frame 10 is released, the lower part of the inner seat portion 3 moves to the front side of the vehicle body around the rotation shaft 8, and the headrest 5 moves to the front side of the vehicle body to move the head H of the occupant. support.

  According to the vehicle seat structure shown in FIGS. 8 to 11, the rear collision is detected by the switch 41 as a sensor and the movable iron core 40A of the electromagnetic solenoid 40 and the pin hole 16 are unlocked. The headrest 5 swings forward of the vehicle body to support the occupant's head H, and whiplash can be prevented, and the rear collision detection mechanism becomes compact.

  The fixed contact 45B of the switch 41 may be connected in series to a terminal on the side where the movable iron core 40A of the electromagnetic solenoid 40 is drawn. In this case, the electric power that can drive the electromagnetic solenoid 40 is supplied by the fixed contacts 45A and 45B. Added. The electromagnetic solenoid 40 constitutes a restoring mechanism that allows the movable iron core 40A as a lock pin to be unlocked after the unlocking of the movable iron core 40A. The outer sheet portion 2 can be locked again and used again.

  Further, the electromagnetic solenoid 40 and the switch 41 may be provided in the frame 10 of the outer sheet portion 2, and the pin hole 16 may be formed in the frame 11 of the inner sheet portion 3. Further, the installation positions of the electromagnetic solenoid 40 and the pin hole 16 may be provided in the lower part on the floor side of the frames 10 and 11.

  The vehicle seat structure according to the present invention can prevent the occurrence of whipping of the occupant at the time of occurrence of a collision after a subsequent vehicle collides with the rear portion of the vehicle.

FIG. 1 is a diagram showing a main part of a vehicle seat structure according to an embodiment of the present invention. FIG. 2 is a view showing a state in which the lower part of the inner seat part is moved rearward of the vehicle body at the time of rear collision in the seat structure of the automobile of FIG. FIG. 3 is an explanatory view showing a frame configuration inside the seat structure of the automobile shown in FIGS. FIG. 4 is a cross-sectional view showing a connection state of the wire, the lock pin, and the pin hole. FIG. 5 is a perspective view showing the internal state of the frame of the inner sheet portion provided in the outer sheet portion. FIG. 6 is a cross-sectional view showing the configuration of the lock pin and the pin hole. FIG. 7 is a view showing a state in which a plurality of wires are provided on the inner frame. FIG. 8 is a diagram showing a configuration of a vehicle seat structure provided with a sensor as a lock release mechanism and an actuator as a lock mechanism. FIG. 9 is a cross-sectional view showing the configuration of the switch of FIG. FIG. 10 is a cross-sectional view showing a state where the movable iron core of the electromagnetic solenoid of FIG. 8 is inserted into the pin hole. FIG. 11 is a flowchart showing the operation steps of the locking mechanism and the unlocking mechanism of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat back 2 Outer seat part 3 Inner seat part 4 Opening part of outer seat part 5 Headrest 6 Stay 7 Slot for stay 9 Lower part of inner seat part 10 Frame of outer seat part 11 Frame of inner seat part 15 Lock pin 16 Pin hole 25 Wire cable 27 Wire 40 Electromagnetic solenoid 40A Movable iron core 41 Switch F1 Load applied at the time of rear impact F2 Load applied to the wire from the passenger at the time of rear impact

Claims (5)

  A seat back that supports the back of an occupant is composed of an outer seat portion that constitutes an outer peripheral edge portion of the seat back, and an inner seat portion that constitutes the inner side of the seat back, and the inner seat is located inside the outer seat portion. And a headrest that supports the head of the occupant is provided on the inner seat portion, and the upper portion of the inner seat portion is disposed above the inner seat portion so that the lower portion of the inner seat portion can move in the longitudinal direction of the vehicle body. An automobile seat structure characterized in that a lower portion of the vehicle is supported by the outer seat portion.   2. The vehicle seat structure according to claim 1, wherein a lock pin for locking both of the outer seat portion and the inner seat portion is provided on either one of the outer seat portion and the inner seat portion. A pin receiving means for the lock pin is provided, and at least one of the lock pin and the pin receiving means locks the lock pin and the pin receiving means at a normal time, and releases the lock between the lock pin and the pin receiving means at a rear collision. An automobile seat structure, characterized in that an unlocking mechanism is provided.   3. The vehicle seat structure according to claim 1, wherein the lock release mechanism is stretched inside the inner seat portion so as to be able to support an occupant's back and is detached from the pin receiving means. An automobile seat structure comprising at least one wire capable of moving the lock pin.   The vehicle seat structure according to any one of claims 1 and 2, wherein the unlocking mechanism is installed on either a vehicle body or a vehicle seat to detect the rear collision, and the sensor An automobile seat structure, comprising: a detaching device for detaching the lock pin from the pin receiving means based on a rear collision detection output of the sensor when a rear collision is detected.   5. The vehicle seat structure according to claim 2, wherein the lock pin, the pin receiving means, and the lock release mechanism have a restoring mechanism that enables the lock to be locked again after the lock pin is unlocked. Car seat structure.

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