JP2009078639A - Occupant crash protection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance crash protection performance of an occupant by maintaining a pivot position of a seat to a predetermined position without causing complication of a structure and getting larger of the device. <P>SOLUTION: When front surface collision of a vehicle is previously detected by an obstacle sensor, a clearance of the occupant 11 and a steering wheel 22 is enlarged by backwardly inclining the seat 1 and energy absorption stroke at collision is increased. A movable base 13 fixed with the seat 1 is rotatably supported by a seesaw hinge 17 at a central part, and both front and rear ends are supported on a front part bracket 21 and a rear part bracket 23 on a vehicle body floor 9 through a front part link mechanism 25 and a rear part link mechanism 27 and are made swingable in a longitudinal direction. A hypo-cycloid mechanism is used as a motive power transmission drive mechanism for pivoting the movable base 13 with the seat 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an occupant protection device that protects an occupant seated in a vehicle seat.

As a conventional occupant protection device, when a frontal collision of a vehicle is detected in advance, the entire seat is rotated backwards and tilted backward to increase the distance between the occupant and the steering wheel before the collision, There is known a technique in which the amount of the seat belt is increased to increase the amount of collision energy absorbed (see, for example, Patent Document 1 below).
JP 2006-175901 A

  By the way, the above-described conventional occupant protection device does not particularly have a function of maintaining the rearward tilted state of the seat, so that the rearward tilted state may be canceled at the time of a frontal collision, and the amount of collision energy absorbed is increased. May not be maintained. Further, when a lock mechanism or the like for maintaining the rearward tilted state of the seat is separately provided, the structure becomes complicated and the apparatus becomes large.

  Note that the above-described Patent Document 1 describes an example in which a motor is used as an actuator for tilting the seat backward, and the driving force of the motor is transmitted from the pinion to the rack. It can also be expected that the tilted state is maintained by the engagement of the pinion and the rack.

  However, the rotation stopping force (braking force) of the motor shaft (pinion) is much smaller than the collision load, and the load input direction through the rack due to the inertial movement of the occupant is the rotation direction of the motor shaft. Therefore, the motor shaft is forcibly rotated by this input load, and the seat may be returned.

  Moreover, although the above-described Patent Document 1 also describes an example in which the seat is tilted backward by inflating the airbag provided between the seat and the floor surface, the seat is tilted backward only with the airbag. Is difficult to maintain, and a separate holding mechanism is required.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve the occupant protection performance by maintaining a predetermined swing position of the seat without complicating the structure and increasing the size of the apparatus.

  According to the present invention, a swing mechanism that swings a vehicle seat in the longitudinal direction of the vehicle body with respect to the vehicle floor as a center with respect to the vehicle body floor, a collision detection unit that detects a frontal collision of the vehicle in advance, and the collision detection unit The occupant protection device includes a power transmission drive mechanism that operates the swing mechanism to swing the seat to a predetermined position when a frontal collision is detected in advance, and the power transmission drive mechanism includes a hypocycloid mechanism. It has the most important feature.

  According to the present invention, since the power transmission drive mechanism that operates the swing mechanism to swing the seat to a predetermined position includes the hypocycloid mechanism, the input direction of the collision load is the drive source that drives the hypocycloid mechanism. Therefore, even if the seat receives a collision load at a predetermined swing position, the drive shaft side of the drive source does not directly receive the rotational power even if the seat receives a collision load at a predetermined swing position. In other words, the power transmission drive mechanism itself constitutes a holding mechanism that holds a predetermined swing position of the seat, and therefore, a predetermined swing position of the seat is maintained and a passenger is protected without providing a separate holding mechanism. Performance can be increased.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a simplified side view of a seat 1 that is a vehicle seat equipped with an occupant protection device according to a first embodiment of the present invention, and (a) shows a state before detecting a frontal collision of the vehicle. (B) shows a state in which the seat 1 is rotated backward and then tilted backward after a frontal collision of the vehicle is detected in advance. In the figure, the direction indicated by the arrow FR is the front of the vehicle, and the direction indicated by the arrow UP is the upper side of the vehicle.

  The seat 1 includes a seat cushion 3, a seat back 5, and a headrest 7 and is installed on a vehicle body floor 9, and an occupant 11 is seated on the seat 1. A movable base 13 as a swinging portion is mounted on the lower surface of the seat cushion 3, while a base member 15 is mounted on the vehicle body floor 9, and a hinge pin 19 is mounted on the top of a seesaw hinge 17 installed on the base member 15. The movable table 13 is attached together with the seat 1 so as to be swingable in the vehicle front-rear direction.

  Reference numeral 20 denotes a seat belt, 22 denotes a steering wheel, and 24 denotes a belt anchor installed on the seat back 5. Further, the seat 1 is provided with a retractor (not shown) for winding up the seat belt 20, and this retractor is provided with a seat belt force limiter mechanism which will be described later.

  Further, a front bracket 21 and a rear bracket 23 are respectively provided at the vehicle front end portion and the rear end portion of the base member 15, and a front link mechanism 25 is provided between the front bracket 21 and the front end portion of the movable base 13. A rear link mechanism 2 7 is interposed between the rear bracket 23 and the rear end of the movable base 13.

  The front link mechanism 25 rotatably connects one end of the first link 29 to the front bracket 21 on the vehicle body floor 9 side via the rotation support pin 31, and one end of the second link 33 on the movable base 13 side. The first link 29 and the second link 33 are connected to each other via a link pin 37 so that the other ends of the first link 29 and the second link 33 can be rotated.

  Similarly, the rear link mechanism 27 rotatably connects one end of the first link 39 to the rear bracket 23 on the vehicle body floor 9 side via the rotation support pin 41 and the second link 43 on the movable platform 13 side. One end of the first link 39 and the second link 43 are connected to each other via a link pin 47 so as to be rotatable.

  A swing mechanism is constituted by the movable base 13 supported swingably on the seesaw hinge 17 and the front and rear link mechanisms 25 and 27.

  In the present embodiment, the frontal collision of the vehicle 49 shown in FIG. 2 is detected in advance. At this time, for example, the obstacle sensor 53 as a collision detection means provided in the front part of the vehicle such as the front grill 51 is used. By detecting an obstacle in front of the vehicle, a frontal collision is detected in advance, and the seat 1 is tilted backward so as to change from the state shown in FIG. 1A to the state shown in FIG. As the obstacle sensor 53, for example, a distance between the vehicle 49 and a front obstacle may be measured by a laser beam or the like.

  When the seat 1 is tilted backward, a pair of front and rear motors 55 and 57 shown in FIG. 3 (the seat 1 is omitted) which is a perspective view showing a specific structure of the present embodiment is used as a drive source.

  In FIG. 3, the same reference numerals are given to portions corresponding to the components described in FIG. 1, and the motors 55 and 57 and a speed reduction mechanism to be described later are provided on the left side in the vehicle width direction. These motors 55 and 57 and the speed reduction mechanism are omitted in FIG.

  As shown in FIG. 3, the left and right base members 15 are supported by a seat slide mechanism 59. That is, in the seat slide mechanism 59, the movable rail 63 fixed to the lower portion of the base member 15 is slidable in the vehicle front-rear direction with respect to the fixed rail 61 fixed on the vehicle body floor 9.

  4 and 5 shown by applying the specific structure of FIG. 3 correspond to FIGS. 1A and 1B, respectively. In FIGS. The portion indicated by 45 corresponds to connecting rods 65 and 67 that connect the left and right mechanism portions as shown in FIG. However, in FIG. 4 and FIG. 5, the occupant 11 shown in FIG. 1, the motors 55 and 57, the speed reduction mechanism, etc. shown in FIG. 3 are omitted.

  The second links 33 and 43 are provided with arc-shaped guide grooves 33a and 43a at the ends opposite to the link pins 37 and 47 with the rotation support pins 35 and 45 as centers, respectively. In 43a, guide pins 69 and 71 provided on the movable base 13 side are respectively inserted so as to be movable. That is, when the sheet 1 is moved and displaced between the state of FIG. 4 and the state of FIG. 5, the guide pins 69 and 71 move in the guide grooves 33a and 43a, respectively.

  FIG. 6 is a perspective view of the vicinity of the motor 57 on the vehicle rear side in FIG. 3 as viewed from below the vehicle rear together with the movable base 13. In the following description, a mechanism related to one motor 57 shown in FIG. 6 will be described, but a mechanism related to the other motor 55 is also equivalent.

  The attachment portion 73 at the vehicle width direction end portion of the motor 57 is attached to the side surface of the coupling mechanism 75. The connecting rod 67 passes through the connecting mechanism 75 and the second link 33, and further passes through a hypocycloid mechanism 77 serving as a power transmission drive mechanism, and is rotatably connected to the movable table 13. The hypocycloid mechanism 77 and the coupling mechanism 75 constitute a speed reduction mechanism.

  The connecting mechanism 75 rotates the connecting rod 67 by transmitting the rotational power of a driving gear (not shown) provided on the motor 57 side to a driven gear (not shown) provided on the connecting rod 67 side.

  As shown in FIG. 7, the hypocycloid mechanism 77 engages the inner teeth of the outer gear 79 with the outer teeth of the inner gear 81, and connects and fixes the connecting rod 67 to the connecting hole 81 a at the center of the inner gear 81 by spline connection. That is, the connecting rod 67 is rotated by the driving of the motor 57 described above, and the inner gear 81 is rotated accordingly, and the rotational power is transmitted to the outer gear 79.

  Here, the outer gear 79 is fixed to the side surface of the second link 43 or integrated inside the second link 43, so that the rotational power of the motor 57 is transmitted to the second link 43 via the inner gear 81 and the outer gear 79. Will be communicated. Therefore, the hypocycloid mechanism 77 is provided on the second link 33.

  With the above configuration, when the pair of front and rear motors 55 and 57 are driven, the movable base 13 supported by the seesaw hinge 17 is connected to the front and rear by the front link mechanism 25 and the rear link mechanism 27 in FIG. Thus, the sheet 1 can be swung and displaced between the normal state in FIG. 1A and the rearward tilted state in FIG. 5 and FIG.

  Here, in the present embodiment, when the obstacle sensor 53 described above detects an obstacle in front of the vehicle, the motors 55 and 57 are driven, for example, from the normal state of FIG. 4 and FIG. 5. Displace to the backward tilted state of FIG.

  Further, the seat 1 includes a reclining mechanism 83, and the motors 55 and 57 are driven to rotate according to the inclination angle of the seat back 5 by the reclining mechanism 83 and the forward / backward slide position of the seat 1 by the seat slide mechanism 59 described above. Change the amount. The inclination angle of the seat back 5 is detected by an encoder, for example.

  That is, in the present embodiment, as shown in the control block diagram of FIG. 8, the control circuit 85 serving as a control unit that receives the detection signal input from the obstacle sensor 53 detects the detection signals from the seat slide position sensor 87 and the reclining angle sensor 89. , The motors (sheet tilting motors) 55 and 57 are driven and controlled.

  In addition, the control circuit 85 is provided in the reclining mechanism 83 so as to receive the detection signal of the reclining angle sensor 89 and to have the prescribed angle when the inclination angle of the seat back 5 deviates from the prescribed inclination angle. The recliner motor, which is a drive unit (not shown), is controlled. That is, the control circuit 85 includes recliner control means.

  Further, the control circuit 85 receives an input of the weight measurement value from the occupant physique sensor 93 as occupant physique detection means for detecting the physique of the occupant 11 seated on the seat 1, and is installed in the vehicle 49 based on this input signal. The seat belt force limiter mechanism 95 is controlled to drive the seat belt force limiter load, which is a tightening load for the occupant 11 of the seat belt 20. That is, the control circuit 85 includes force limiter control means for controlling the force limiter load of the seat belt force limiter.

  At this time, the control circuit 85 controls the force limiter load of the above-described seat belt force limiter mechanism 95 according to the inclination angle of the seat back 5 based on the detection signal of the reclining angle sensor 89.

  Further, the control circuit 85 described above receives the detection signal input from the obstacle sensor 53, drives and controls the seat belt winding mechanism 97 to wind the seat belt 20, and restrains the occupant 11 to the seat 1.

  Next, the operation of the occupant protection device will be described based on the flowchart showing the control operation of the control circuit 85 shown in FIG. First, when the obstacle sensor 53 detects an obstacle in front of the vehicle, this detection signal is captured (step 101), and it is determined whether or not the vehicle 49 collides with the front by the captured detection signal (step 102).

  Here, when it is determined that the vehicle 49 collides with the front, that is, when the front collision of the vehicle 49 is detected in advance, the seat belt retracting mechanism 97 is driven to retract the seat belt (step 103), and the occupant 11 is bound to the sheet 1.

  At the same time, the front / rear slide position of the seat 1 by the seat slide mechanism 59 is detected by the seat slide position sensor 87, the inclination angle of the seat back 5 by the reclining mechanism 83 is detected by an encoder, and the occupant physique sensor 93 is detected by the occupant 11 The body weight is measured and these detected values are taken in (step 105), and then analyzed and signal processed (step 106).

  Here, in this embodiment, when the collision of the vehicle 49 is detected in advance, the distance S1 between the occupant 11 and the steering wheel 22 shown in FIG. The interval S2 is wider than the interval S1, and the inclination angle of the seat back 5 is inclined backward by an angle α (for example, 41 °) with respect to the vertical line.

  In consideration of such points, control of the swing position with respect to the seat 1 (inclination angle of the entire seat 1) when a frontal collision of the vehicle 49 is detected in advance is performed as follows.

  That is, as described above, after detecting the front / rear slide position of the seat 1, the inclination angle of the seat back 5 and the weight of the occupant 11 and analyzing / signaling them, the inclination angle (recliner angle) of the seat back 5 is obtained. Is determined whether it is necessary to correct (step 107).

  Whether or not to correct the inclination angle of the seat back 5 is determined based on whether or not the inclination angle is different from the angle α in FIG. Here, when the inclination angle is different from the angle α by a predetermined angle or more, in order to swing the entire seat 1 to the angle α, the link mechanism 25 is moved from the motors 55 and 57 for backward inclination of the seat. , 27, etc., the response when tilting the entire seat 1 is not sufficient, so that the reclining motor (recliner motor) 91 is driven so that the seat back 5 is at an angle close to the angle α to some extent. Correction is performed (step 110).

  For example, when the seat back 5 is in an upright state, there is a possibility that the angle α from this state may not be within the time until the collision, so the seat back 5 is moved backward by a predetermined angle so as to be closer to the angle α. Correct to tilt.

  That is, when the inclination angle of the seat back 5 deviates from a predetermined inclination angle set in advance (an angle different from the angle α by a predetermined angle or more), the reclining mechanism 83 is set to be within the predetermined angle. Drive control of the reclining motor 91 which is the provided drive part is carried out.

  On the other hand, when it is determined in step 107 that it is not necessary to correct the inclination angle (recliner angle) of the seat back 5, that is, when the inclination angle of the seat back 5 is not different from the angle α by a predetermined angle or more (angle) In a state relatively close to α), the inclination angle of the seat back 5 is not corrected and is left as it is.

  Thereafter, the operation of the motors 55 and 57 for tilting the rearward of the seat is controlled, and the entire seat 1 is swung and displaced backward from the state shown in FIG. 1A to the state shown in FIG. Step 108). That is, the operation of the motors 55 and 57 shown in FIG. 3 causes the connecting rods 65 and 67 to rotate via the connecting mechanism 75, and the hypocycloid mechanism 77 and the link mechanisms 25 and 27 shown in FIG. The movable base 13 rotates around the seesaw hinge 17 together with the seat 1 via the.

  When controlling the operation of the motors 55 and 57, the amount of rotation is adjusted according to the inclination angle of the seat back 5 and the front / rear slide position of the seat 1, and the distance between the occupant 11 and the steering wheel 22 is as shown in FIG. ), And the inclination angle of the seat back 5 is set to α.

  Thus, according to the present embodiment, when the frontal collision of the vehicle is detected in advance, the seat 1 is rotated backward as shown in FIG. Is larger than the distance S1 in the state of FIG.

  As a result, the amount of extension of the seat belt 20 at the time of a subsequent vehicle collision can be increased, the extension speed can be made more gradual, and the amount of collision energy absorbed can be increased.

  At this time, in this embodiment, since the hypocycloid mechanism 77 is used as a power transmission drive mechanism that swings the seat 1 backward by driving the motors 55 and 57 to tilt backward, the input direction of the collision load is A direction in which the outer gear 79 shown in FIG. 7 does not coincide with the rotation direction of the motors 55 and 57 that drive the hypocycloid mechanism 77 and the inner gear 81 is simply orthogonal to the connecting rod 67 (a direction parallel to the paper surface in FIG. 7). Therefore, even if the seat 1 receives a collision load in a backward tilted state, the rotation support pins 35 and 45 (connection rods 65 and 67) connected to the motor shaft by the load input directly rotate power. Not receive.

  That is, the hypocycloid mechanism 77 itself constitutes a holding mechanism that holds the rearward tilted state of FIG. 1B, which is a predetermined swinging position of the seat 1, and therefore, the holding mechanism is separately dedicated. Therefore, the protection performance of the occupant 11 can be improved by maintaining the rearward tilted state of the seat 1.

  When the front / rear slide position of the seat 1 is in the rear end or near the rear end and the seat back 5 is in an upright state, the inclination angle of the seat back 5 remains the same and the entire seat 1 remains tilted rearward. Do not operate anything. That is, in this state, a sufficient distance between the occupant 11 and the steering wheel 22 is ensured, so that the rearward tilt control of the seat 1 is unnecessary.

  Even when the front / rear slide position of the seat 1 is in the rear end or near the rear end, when the seat back 5 is inclined at a large angle, for example, more than the angle α (closer to the horizontal). The reclining mechanism 83 raises the seat back 5 to an angle α to ensure the restraint state of the occupant 11 by the seat belt 20.

  During the backward tilting operation of the seat 1 in step 108, the tightening load of the seat belt 20 by the seat belt force limiter mechanism 95 is adjusted and controlled according to the tilt angle of the seat back 5 (step 109).

  In the state where the inclination angle of the seat back 5 is closer to the upright angle than the angle α described above, the tightening load adjustment control is performed slowly or gradually because the restraint force on the occupant 11 by the seat belt 20 at the time of a frontal collision is sufficient. It weakens step by step, and the feeding operation of the seat belt 20 after the collision is made smooth. On the other hand, in a state where the inclination angle of the seat back 5 is closer to the horizontal than the angle α, the restraining force on the occupant 11 by the seat belt 20 at the time of a frontal collision becomes insufficient, and thus the strength is gradually or stepwise increased.

  In addition, the physique of the occupant 11 is also taken into account in the adjustment control of the force limiter load in step 109 described above. That is, when the physique of the occupant 11 detected by the occupant physique sensor 93 is large and heavier than a preset weight, the force limiter load is increased to secure the restraining force for the heavy occupant 11. On the other hand, when the occupant 11 has a small physique and is equal to or less than a preset weight, the inertial force when moving forward of the occupant 11 at the time of a frontal collision is smaller than that of the heavy occupant 11 and thus weakens. As a result, the amount of pulling out of the seat belt 20 at the time of a collision can be made appropriate, and the impact on the occupant can be suppressed.

  In the present embodiment, the swing mechanism includes a movable base 13 to which the seat 1 is attached, extends in the longitudinal direction of the vehicle with respect to the seesaw hinge 17 and can swing, and the forward and backward direction of the vehicle body from the seesaw hinge 17 of the movable base 13. Since the front and rear link mechanisms 25 and 27 for connecting the end portion far away from the vehicle body floor 9 are respectively provided, the mechanism can be simplified as a mechanism for rotating the seat 1 to tilt backward.

  Further, the front and rear link mechanisms 25 and 27 rotatably connect one end of the first links 29 and 39 to the vehicle body floor 9 side and rotate one end of the second links 33 and 43 to the movable base 13 side. The other ends of the first links 29 and 39 and the second links 33 and 43 are rotatably connected to each other, and the other ends of the second links 33 and 43 and the movable table 13 are connected. Since the hypocycloid mechanism 77 is provided, the overall size of the apparatus can be suppressed.

  Further, when the seat 1 swings backward and tilts backward, as shown in FIG. 1B, the angle θ formed by the second links 33 and 43 and the first links 19 and 39 is substantially perpendicular. By doing so, the load F at the time of a frontal collision acting on the movable base 13 is changed from the second link 33, 43 to the first link 29, compared with the case where the angle is acute as shown in FIG. It is possible to escape directly and efficiently to the vehicle body floor 9 via 39, and it is possible to suppress deformation of each gear portion in the hypocycloid mechanism 77 and the coupling mechanism 75 due to the load bias.

  As described above, by efficiently releasing the load F to the vehicle body floor 9 side at the time of a frontal collision, the return phenomenon from the rearward tilted state of the seat 1 can be suppressed, and the passenger protection performance is further improved.

  Further, according to the present embodiment, the movable base 13 is extended toward both sides in the vehicle front-rear direction with respect to the seesaw hinge 17, and the front and rear link mechanisms 25, 27 are provided at both extended ends, respectively. Since the motors 55 and 57, which are drive sources, are provided corresponding to the mechanisms 25 and 27, respectively, the torque of the motors 55 and 57 can be reduced as compared with the case where the drive source is provided only on one side, and the power transmission The rigidity of the drive mechanism can be reduced accordingly.

  Further, when the occupant 11 is seated on the seat 1, the vehicle longitudinal direction position of the seesaw hinge 17 with respect to the seat 1 is set so that a load is applied in a direction in which the seat 1 is tilted backward by its own weight (weight). As a result, the position of the center of gravity of the occupant 11 is positioned behind the seesaw hinge 17, and the torque of the motors 55 and 57 when the seat 1 is rotated backward can be further suppressed.

  In addition, the seat 1 includes a seat slide mechanism 59 that slides in the vehicle front-rear direction together with the movable base 13, and the seat back 5 includes a reclining mechanism 83 in which the inclination angle in the vehicle front-rear direction is variable. Since the swing position of the seat 1 is controlled in accordance with the forward / backward slide position of the seat 1 and the inclination angle of the seat back 5 by the reclining mechanism 83, the posture of the occupant 11 when the seat 1 is tilted backward is further increased. It can be stabilized and the protection performance of the passenger | crew 11 can be improved.

  Further, the seat 1 includes a reclining mechanism 83 that allows the seat back 5 to change the inclination angle in the vehicle front-rear direction with respect to the seat cushion 3, and the inclination angle of the seat back 5 by the reclining mechanism 83 deviates from a specified inclination angle. The tilt angle of the seat back 5 is corrected so as to be within the range of the specified angle by controlling the reclining motor 91 which is a drive unit provided in the reclining mechanism 83 so that the specified angle is set. Thereafter, the change to the angle α of the seat 1 by the driving of the backward tilting motors 55 and 57 can be carried out promptly.

  In the present embodiment, the seat 1 includes a reclining mechanism 83 that allows the seat back 5 to vary the inclination angle in the vehicle front-rear direction with respect to the seat cushion 3, and a seat belt force limiter mechanism 95 that is provided in the vehicle 49. Since the control circuit 85 including the force limiter control means for controlling is provided and the force limiter load is controlled by the control circuit 85 according to the inclination angle of the seat back 5, the occupant 11 by the seat belt 20 at the time of a frontal collision. It is possible to secure the restraining force against the desired amount regardless of the inclination angle of the seat back 5.

  Further, an occupant physique sensor 93 for detecting the physique of the occupant 11 seated on the seat 1 and a control circuit 85 including a force limiter control means for controlling the seat belt force limiter mechanism 95 provided on the vehicle 49 are provided, respectively. Since the force limiter load is controlled by the control circuit 85 according to the physique of the occupant 11 detected by the sensor 93, the protection performance according to the physique of the occupant 11 can be ensured.

  FIG. 10 is a perspective view corresponding to FIG. 3, showing a second embodiment of the present invention. In this embodiment, as a drive source for rotating the connecting rod 67 at the rear of the vehicle, a motor 57A is provided in the mechanism portion on the right side in the vehicle width direction in addition to the motor 57, and the connecting rod 67 is rotationally driven by the two motors 57 and 57A. I try to let them. A drive source for rotating the connecting rod 65 in front of the vehicle is not provided. Other configurations are the same as those of the first embodiment.

  Also in the second embodiment, since the hypocycloid mechanism 77 is used as a power transmission drive mechanism that swings the seat 1 backward by driving the motors 57 and 57A and tilts backward, the input direction of the collision load is Even if the seat 1 receives a collision load in a backward tilted state, the rotation support pin 45 connected to the motor shaft by the load input directly does not coincide with the rotation direction of the motors 57 and 57A that drive the hypocycloid mechanism 77. Rotational power is not received.

  For this reason, the hypocycloid mechanism 77 itself constitutes a holding mechanism that holds the rearward tilted state of FIG. 1B, which is a predetermined swing position of the seat 1, and therefore, a separate dedicated holding mechanism is used. Without providing a thing, the back-inclined state of the seat 1 can be maintained and the protection performance of the occupant 11 can be enhanced.

  As described above, in the above-described second embodiment, the hypocycloid mechanism 77 moves the seat 1 to the rear of the vehicle by the operation of the swing mechanism including the movable base 13 when the obstacle sensor 53 detects a frontal collision in advance. The motor 57A as a drive source is provided corresponding to the rear link mechanism 27 out of the front link 25 mechanism and the rear link mechanism 27, and a drive source is provided on the front link mechanism 25 side. By providing a structure that does not provide the weight, the weight of the rear side of the vehicle body is heavier than that of the seesaw hinge 17, and the torque of the motors 57, 57A when the seat 1 is rotated rearward can be reduced. .

BRIEF DESCRIPTION OF THE DRAWINGS It is the simplified side view of the vehicle seat provided with the passenger | crew protection device which shows the 1st Embodiment of this invention, (a) shows the state before detecting the frontal collision of a vehicle, (b) is vehicle This shows a state where the seat is tilted backward after detecting a frontal collision in advance. It is a perspective view of the vehicle provided with the passenger | crew protection device of FIG. It is a perspective view which shows the specific structure of the passenger | crew protection device of FIG. FIG. 2 is a side view of a vehicle seat having a more specific structure corresponding to FIG. FIG. 2 is a side view of a vehicle seat having a more specific structure corresponding to FIG. FIG. 4 is a perspective view of the vicinity of a motor on the vehicle rear side in FIG. 3 as viewed from behind and below. It is sectional drawing of the hypocycloid mechanism used for the passenger | crew protection apparatus of FIG. FIG. 2 is a control block diagram of the occupant protection device of FIG. 1. It is a flowchart which shows the control action of the control circuit in the passenger | crew protection apparatus of FIG. It is a perspective view corresponding to FIG. 3 which shows the 2nd Embodiment of this invention.

Explanation of symbols

1 seat
5 Seat back 9 Body floor 13 Movable stand (swinging part, swinging mechanism)
17 Seesaw hinge (supporting part)
25 Front link mechanism (link mechanism, swing mechanism)
27 Rear link mechanism (link mechanism, swing mechanism)
29, 39 First link 33, 43 Second link 49 Vehicle 53 Obstacle sensor (collision detection means)
55, 57, 57A Motor (drive source)
59 Seat slide mechanism 77 Hypocycloid mechanism (power transmission drive mechanism)
83 Reclining mechanism 85 Control circuit (recliner control means, force limiter control means, control means)
93 Weight measuring device (occupant physique detection means)

Claims (11)

  A swing mechanism for swinging a vehicle seat in the longitudinal direction of the vehicle body with respect to the vehicle body floor with respect to the vehicle body floor, a collision detection means for detecting a frontal collision of the vehicle in advance, and a frontal collision in advance by the collision detection means And a power transmission drive mechanism that activates the swing mechanism to swing the seat to a predetermined position when detected, and the power transmission drive mechanism includes a hypocycloid mechanism. An occupant protection device.   The swing mechanism includes a swing portion to which the seat is attached, extends in the vehicle front-rear direction with respect to the support portion and is swingable, and an end portion of the swing portion that is separated from the support portion in the vehicle front-rear direction. The occupant protection device according to claim 1, further comprising a link mechanism that connects the vehicle body floor and the vehicle body floor.   The link mechanism rotatably connects one end of the first link to the vehicle body floor side, and rotatably connects one end of the second link to the swinging portion side. 3. The occupant protection according to claim 2, wherein the other end of the second link is rotatably connected and the hypocycloid mechanism is provided between the other end of the second link and the swinging portion. apparatus.   The occupant protection device according to claim 3, wherein the first link and the second link are substantially perpendicular when the seat is swung to a predetermined position.   A drive source that swings the swinging portion is provided in each link mechanism that connects the end of the swinging portion that is separated from the support portion in the vehicle longitudinal direction and the vehicle body floor. Item 5. The occupant protection device according to any one of Items 2 to 4.   When the frontal collision is detected in advance by the collision detection means, the power transmission drive mechanism swings the seat toward the rear of the vehicle by the operation of the swinging mechanism, and tilts the seat backward. A drive source for swinging the swinging portion is provided in a link mechanism on the vehicle rearward side among the link mechanisms that connect the end portion separated from the support portion in the longitudinal direction of the vehicle body and the vehicle body floor. The occupant protection device according to any one of claims 2 to 4.   The vehicle longitudinal direction position of the support portion with respect to the seat is set so that a load is applied in a direction in which the seat is tilted rearward by the weight of the occupant when the occupant sits on the seat. The occupant protection device described in 1.   The seat includes a seat slide mechanism that slides in the vehicle front-rear direction together with the swinging portion, and a reclining mechanism in which a seat back changes a tilt angle in the vehicle front-rear direction, and the seat slide of the seat by the seat slide mechanism The occupant protection device according to any one of claims 1 to 7, further comprising control means for controlling a swing position of the seat according to a position and an inclination angle of a seat back by the reclining mechanism. .   The seat includes a reclining mechanism in which the seat back has a variable tilt angle in the vehicle front-rear direction with respect to the seat cushion, and when the tilt angle of the seat back by the reclining mechanism deviates from the specified tilt angle, The occupant protection device according to any one of claims 1 to 8, wherein recliner control means for controlling a drive unit provided in the reclining mechanism is provided so as to have an angle.   The seat includes a reclining mechanism that allows a seat back to change a tilt angle in a vehicle front-rear direction with respect to a seat cushion, and includes a force limiter control unit that controls a seat belt force limiter installed in the vehicle. The occupant protection device according to any one of claims 1 to 9, wherein a force limiter load of a seat belt force limiter by the force limiter control means is controlled in accordance with an inclination angle.   An occupant physique detecting means for detecting the physique of the occupant seated on the seat and a force limiter control means for controlling a seat belt force limiter equipped on the vehicle are provided, respectively, and the occupant physique detected by the occupant physique detecting means is provided. The occupant protection device according to any one of claims 1 to 10, wherein a force limiter load of a seat belt force limiter by the force limiter control unit is controlled accordingly.

Images