JP2008247170A - Seat for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To securely restrain an occupant from moving forward without making a seat uncomfortable to sit on in a state that a load acting on a waist and a chest in sudden deceleration of an automobile is smaller. <P>SOLUTION: Inside a front part of a seat cushion 1, a receiving member 15 extending in the width direction of the seat cushion 1 is arranged on a vehicular rear side behind a spindle pin 7 mounted to a frame part 2 as a reinforcement member of the seat cushion 1. An inertial mass 17 extending to the width direction of the seat cushion 1 is arranged on a vehicular front side from the spindle pin 7 as well as above the spindle pin 7. The receiving member 15 and the inertial mass 17 are connected by a connection member 11 with its middle part rotatably/pivotally supported by the spindle pin 7. A panel 25 is arranged between the receiving member 15 and the inertial mass 17. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an automobile seat, and more particularly to an automobile seat that reliably suppresses forward movement of an occupant during a sudden deceleration of the automobile.

  Conventionally, when an automobile decelerates suddenly, a seat belt is provided as a means for preventing an occupant from moving forward due to inertia. However, there is a problem that the occupant's lower back portion moves forward while sinking into the seat cushion, and may not work effectively. Therefore, a cross member such as a pipe is placed across the seat cushion so that it is positioned at the front of the occupant's waist when seated normally on the seat cushion, and the occupant's waist is received by this cross member and moved forward. It has also been proposed to suppress this. However, if the cross member is disposed in the front part of the seat cushion, there is a problem in that the seating comfort of the occupant is deteriorated and the comfort of the drive is obstructed. Then, there is a problem that the effect of preventing the passenger from moving forward is not obtained.

  Therefore, a seat cushion raising means is provided at the front part in the seat cushion, a member that moves by the movement of the waist of the occupant during sudden deceleration of the vehicle is provided, and the seat cushion raising means is operated in conjunction with the movement of the member. There has been proposed one in which the front end portion of the seat cushion is raised (see Patent Document 1).

  In addition, the cross member is usually arranged at a low position, and when a collision is detected by a sensor or the like, the power generation device incorporating the gas generation means is operated, and the cross member is appropriately lifted upward via an interlocking means such as a link mechanism. The thing which did it is also known (for example, refer patent document 2).

  In addition, the applicant first provided a means for urging the receiving portion upward while arranging the receiving portion extending in the left-right direction in the seat cushion in a state of being supported so as to be movable in the vertical direction, It has been proposed that the downward movement of the receiving portion is prevented by a lock member that is activated by inertia during sudden deceleration, so that the occupant can be moved forward by the receiving portion (see, for example, Patent Document 3). .)

Furthermore, as shown in FIG. 7, the applicant firstly, in the front part of the seat cushion 41, on the vehicle rear side from the support shaft 43 attached to the frame part 42 that is a strength member inside the seat cushion 41. A receiving member 45 extending in the width direction of the seat cushion 41 is disposed, an inertia mass 46 is disposed in front of the support shaft 43 and above the support shaft, and the intermediate portion rotates on the support shaft 43. There has been proposed a connecting member 44 that is pivotally supported by connecting a receiving member 45 and an inertial mass 46 (see, for example, Patent Document 4).
JP-A-5-238297 JP 2000-1136 A International Publication No. 02/066285 Pamphlet International Publication No. 2005/073017 Pamphlet

  However, the configuration disclosed in Patent Document 1 has a problem that the configuration is complicated and the cost is high, and it is necessary to provide a member that moves by moving the waist of the occupant, and thus there is a problem that the sitting comfort is affected. In addition, the configuration disclosed in Patent Document 2 requires a mechanism for forcibly lifting the cross member when necessary and its driving means. But there is a problem of getting heavy.

  Further, in the configuration disclosed in Patent Document 3, the configuration is simple and the seating comfort is not bad at the time of sitting, but when the occupant's waist moves forward at the time of a frontal collision, it is received by the lower component force of the load applied to the receiving member. There is a fear that the stop member may escape downward, and there is concern about the stability of the effect of preventing the passenger from moving forward.

  On the other hand, in the configuration disclosed in Patent Document 4, when an occupant sits on the seat cushion 41, a pressing force is applied to the receiving member 45 from above, so that the receiving member 45 easily moves downward to detect foreign objects. When the vehicle is suddenly decelerated due to a frontal collision, the receiving member 45 is reliably moved upward by the inertial force acting on the inertial mass 46, and the occupant's waist moves forward. Even if an attempt is made, the waist is received by the receiving member 45, and the forward movement of the occupant is reliably suppressed. Further, since a push-up mechanism and driving means are not provided separately, the configuration is simple, and the effect that it can be configured at a light weight and low cost is exhibited.

  However, when verification / analysis was performed using a dummy on the behavior when the occupant's waist is received by the receiving member during sudden deceleration, the receiving member 45 is moved to an arrow as shown in FIG. The dummy pelvis 31 is surely moved upward as shown in FIG. 3A, and the front protrusion 31a of the dummy pelvis 31 is received by the receiving member 45 at an early stage of sudden deceleration. After the forward movement is once suppressed, the dummy pelvis 31 is subsequently moved forward. 8B, the front protrusion 31a of the dummy pelvis 31 gets over the receiving member 45 and fits into the space between the receiving member 45 and the front end panel portion 42a of the frame portion 42. In addition, the recessed portion 31b at the rear of the front protrusion 31a of the dummy pelvis 31 is fitted into the receiving member 45, and then the dummy pelvis 31 is further moved forward, as shown in FIG. 31 front protrusion 31 May run on the front end panel portion 42a of the frame portion 42, and the rear projecting portion 31c of the dummy pelvis 31 may be received by the receiving member 45, and thereafter the deceleration may decrease smoothly. found.

  The time change of the dummy chest deceleration (G) during this period is shown by a solid line in FIG. That is, immediately after the sudden deceleration, the dummy pelvis 31 is received by the receiving member 45 in the state of FIG. 8A, and the chest deceleration once increases due to the increase in the deceleration of the waist, and then FIG. 8B. In this state, the deceleration of the waist is extremely reduced and the chest deceleration is also lowered. Thereafter, in the state of FIG. 8C, the deceleration of the waist is increased again and the dummy pelvis 31 is attached to the front end panel portion 42a of the frame portion 42. As a result, the chest deceleration is increased again. Therefore, compared with the ideal characteristic shown by the one-dot chain line in FIG. 6, there is a problem that the effect of reducing the peak value of the chest deceleration is not sufficiently exhibited. . For comparison, FIG. 6 shows a change in chest deceleration with a broken line when only the seat belt is used. The maximum peak of the broken line is caused by interference inside the dummy at the end of the rapid deceleration and is very large.

  In view of the above-mentioned conventional problems, the present invention can reliably suppress the forward movement of the occupant in a state where the load acting on the waist and the chest is smaller when the automobile decelerates rapidly without deteriorating the sitting comfort. Another object of the present invention is to provide an automobile seat that is simple in configuration and can be configured at a low weight and at a low cost.

  In the vehicle seat of the present invention, a receiving member extending in the width direction of the seat cushion is disposed on the vehicle rear side from the support shaft attached to the strength member of the seat cushion inside the front portion of the seat cushion. An inertial mass extending in the width direction of the seat cushion is arranged in front of the vehicle and above the support shaft, and the receiving member and the inertial mass are connected by a connecting member pivotally supported by the support shaft at the intermediate portion. In addition, a panel is disposed between the receiving member and the inertia mass.

  According to the above configuration, when a passenger sits on the seat cushion and a force acts on the receiving member from above, the connecting member swings around the support shaft and the receiving member easily moves downward. If the feeling of foreign matter is alleviated and the seating comfort is not deteriorated, and if the vehicle suddenly decelerates due to a frontal collision, the connecting member swings in the reverse direction around the spindle due to the inertial force acting on the inertial mass, and the receiving member The pelvis of the occupant is received by the receiving member, and the pelvis of the lumbar part is supported on the panel and does not fall downward even if the pelvis of the lumbar part gets over the receiving member after that. There is no extreme reduction and re-rise in deceleration when riding over, and therefore it is possible to reliably suppress forward movement with a smaller load acting on the occupant's lower back and chest, and the push-up mechanism and drive means can be Easy not provided separately It can be configured lightweight and inexpensive.

  According to the vehicle seat of the present invention, the seating member does not deteriorate easily because the seating member easily moves downward, and the seating member moves upward by inertia force when suddenly decelerating due to a frontal collision. As a result, even if the occupant's waist is received, and even if the occupant is moved over the receiving member, the deceleration will not drop drastically and will not rise again, so the forward movement can be ensured with a smaller load acting on the occupant's waist and chest. It can be suppressed, and can be configured simply, lightly and inexpensively.

  Hereinafter, an embodiment of an automobile seat of the present invention will be described with reference to FIGS.

  First, the configuration of the automobile seat according to the present embodiment, that is, the configuration that is a premise of the main configuration of the present embodiment will be described. 1 and 2, reference numeral 1 denotes a seat cushion of an automobile seat, 2 denotes a steel frame portion as a strength member of the seat cushion 1, and both sides thereof are attached to upper rails of left and right seat rails (not shown). It has been. A cushion pad 3 made of urethane foam or the like is attached to the upper portion of the frame portion 2, and its outer surface is covered with an exterior material (not shown). S springs 4 as a plurality of support spring members that support the lower surface of the cushion pad 3 with an appropriate interval in the front-rear direction are stretched in the opening between both side plates in the vehicle front-rear direction middle part or rear part of the frame part 2. Has been. Between the two side plates at the lower part of the cushion pad 3 in the front part of the frame part 2, there is provided a movement restraining device 5 that suppresses the forward movement of the occupant's waist during sudden deceleration. A front end panel portion 2c of the frame portion 2 is provided.

  Next, the configuration of the movement suppressing device 5 will be described in detail mainly with reference to FIG. The tip end portions of the mounting protrusions 6 a formed by bending at the four peripheral edges of the mounting plate 6 for mounting the movement suppressing device 5 are integrally fixed to the welded portions 2 b of the side plates 2 a of the frame portion 2 by welding. Inside the mounting plate 6, a holding plate 10 is disposed opposite to each other with three pins, a support pin 7, a support pin 8, and a stopper pin 9, and is integrated by caulking of these pins. Fixed. The connecting member 11 and the pendulum member 18 are disposed in the gap between the mounting plate 6 and the holding plate 10.

  The connecting member 11 has a substantially U-shaped or V-shaped concave shape in a side view of the vehicle, and an intermediate portion thereof is pivotally supported by a pivot pin 7 so as to be swingable in the vertical direction. The connecting member 11 includes a receiving member mounting arm portion 12 that extends obliquely rearward and upward and an inertia mass mounting arm portion 13 that extends diagonally forward and upward. A mounting piece 14 is formed in an L-shape by bending toward the inner side of the seat cushion 1 at the distal end portion of the receiving member mounting arm portion 12. A receiving member 15 made of a pipe material is horizontally placed between the mounting pieces 14 and 14 of the receiving member mounting arm portion 12 of the left and right connecting members 11, and both end portions thereof are integrally fixed to the mounting piece 14 by welding. ing. The receiving member mounting arm portion 12 and the receiving member 15 constitute a receiving portion, and the receiving member 15 is supported by the front portion inside the seat cushion 1 so as to be movable in the vertical direction.

  Further, an attachment piece 16 is bent in an L shape toward the inner side of the seat cushion 1 at the distal end portion of the inertia mass attachment arm portion 13. And the inertia mass 17 which consists of the steel plate extended in the width direction of the seat cushion 1 across the attachment pieces 16 and 16 of the inertia mass attachment arm part 13 of the right and left connecting members 11 is horizontally mounted, and both ends thereof are welded to the attachment pieces 16. It is fixed integrally with. Thus, the receiving member 15, the support pin 7, and the inertia mass 17 are arranged so that a line connecting them in a vehicle side view is a substantially U-shaped or V-shaped concave shape. The member 11 has a shape along the line.

  The pendulum member 18 is disposed behind the connecting member 11, and a lower end portion of the pendulum member 18 is pivotally supported by the support pin 8 so as to be swingable back and forth. Further, a spring 19 that swings and urges the pendulum member 18 backward is interposed between an upper rear end of the pendulum member 18 and a spring hooking hole 10 a formed at the rear end of the holding plate 10. Further, a stopper piece 20 that restricts the rear swing end of the pendulum member 18 is extended from both side plates 2 a of the frame portion 2.

  A lower portion of the receiving member mounting arm portion 12 extends rearward, a rear end edge thereof is formed in an arc shape centering on the axis of the support pin 7, and an engagement tooth row 21 is formed. Further, meshing teeth 22 that mesh with the engagement tooth row 21 when swinging forward are formed on the upper front edge of the pendulum member 18, and the receiving member mounting arm portion is engaged with the engagement tooth row 21 and the meshing tooth 22. The ratchet mechanism is configured to allow the upper 12 to swing upward but prevent downward swing. Thus, at the time of sudden deceleration, the pendulum member 18 swings forward by the inertial force, and the meshing teeth 22 engage with the engaging tooth row 21 of the receiving member mounting arm portion 12 of the swinging arm 11, and the receiving member 15. Is prevented from moving downward.

  Further, a torsion spring 23 is disposed around the projecting shaft portion 7 a protruding from the inner end of the support pin 7, and one end 23 a thereof is engaged with the lower edge of the mounting piece 14 of the receiving member mounting arm portion 12. The other end 23 b is engaged with the upper edge of the mounting plate 6, and the receiving member 15 is urged to swing upward by the torsion spring 23. Further, the rocking end on the upper front side of the receiving member 15 is regulated by the front end edge of the receiving member mounting arm portion 12 coming into contact with the stopper pin 9.

  In FIG. 1, 30 is a dummy assumed for an occupant seated on the seat cushion 1, and 31 is a dummy pelvis at the waist.

  In the movement suppressing device 5 having the above basic configuration, in the present embodiment, as shown in detail in FIGS. 3 and 4, the upper ends of the receiving member 15 and the inertia mass 17 are connected with a smooth curved surface. A panel 25 is arranged. The panel 25 is made of a steel plate or a synthetic resin plate having a width corresponding to substantially the entire length of the receiving member 15 and the inertia mass 17 in the vehicle width direction, and a front end portion 25 a thereof is overlapped on the upper surface of the inertia mass 17. An appropriate place is fastened and fixed by a screw 26 a and a nut 26 b, a rear end portion 25 b is bent in an arc shape along the outer periphery of the upper portion of the receiving member 15, and an appropriate place is fastened and fixed by a screw 27. The panel 25 may be disposed only in the center portion in the axle direction where the pelvis of the waist of the passenger hits.

  According to the above configuration, when the occupant sits on the seat cushion 1 of the automobile seat or when the occupant operates the pedal, the cushion pad 3 is displaced downward while being compressed. Accordingly, the receiving member 15 is pressed downward as shown by the solid line from the state shown by the phantom line in FIG. 1, and the connecting member 11 easily swings against the biasing force of the torsion spring 23. Therefore, the receiving member 15 smoothly moves downward, so that the passenger does not feel uncomfortable or does not deteriorate the sitting comfort. Further, when the occupant is seated, the area for receiving the thigh is increased by the panel 25, so that the uncomfortable feeling can be further reduced. Further, since the pendulum member 18 is urged to move backward by the urging force of the tension spring 19 and does not swing forward, the lowering operation of the receiving member 15 is unexpectedly prevented during normal use, and the sitting comfort is improved. There will be no deterioration.

  Further, the receiving member 15 oscillated and biased upward by the torsion spring 23 performs the same function as the S spring 4, and the receiving member 15 and the S spring 4 pass through a relatively thin cushion pad 3. Since the occupant's waist is supported, the entire occupant's waist can be supported with a comfortable cushion.

  On the other hand, when sudden deceleration occurs due to a frontal collision of the automobile, first, in the initial stage, the pendulum member 18 resists the urging force of the tension spring 19 from the state shown by the solid line in FIG. The meshing tooth 22 meshes with the engagement tooth row 21 of the receiving member mounting arm portion 12, and the locking for the downward swinging of the receiving member mounting arm portion 12 is started. The downward movement of the member 15 is prevented. In this state, a force for pushing the receiving member 15 upward and upward is exerted by the inertial force acting on the receiving member 15, and the inertial mass 17 is moved forward by the inertial force acting on the inertial mass 17. In conjunction with this, a force is applied to push up the receiving member 15 forward and upward, and the receiving member 15 is pushed further upward and upward. Further, the panel 25 functions in the same manner as the inertia mass 17, and the inertia force acts as a force that pushes up the receiving member 15 forward and upward.

  Thus, in the example of the dummy 30 corresponding to an occupant, the dummy pelvis 31 is reliably received by the receiving member 15 even if the waist of the dummy 30 is moved forward by sudden deceleration, and the receiving member 15 The forward movement of 30 is reliably prevented. In addition, when force is applied to the receiving member 15 from the rear in a forward direction when the occupant's waist is moving forward during sudden deceleration, a component force that swings the receiving member 15 upward acts. 15, the forward movement of the waist of the dummy 30 can be more reliably suppressed.

  Further, even if the front protrusion 31a of the dummy pelvis 31 climbs over the receiving member 45 in the middle and late stages of sudden deceleration, the front protrusion 31a of the dummy pelvis 31 that has been climbed over the panel 25 as shown in FIG. Supported. Further, even if the front protrusion 31a of the dummy pelvis 31 moves further forward, it smoothly transfers from the panel 25 to the front end panel portion 2c of the frame portion 2. Therefore, as shown in FIG. 8 (b), the recess 31b of the dummy pelvis 31 is fitted into the receiving member 45, and as shown by the solid line in FIG. Chest deceleration does not decrease, and then does not increase significantly again. As indicated by the dashed line in FIG. 6, deceleration is maintained with the deceleration maintained substantially, and a large peak of deceleration is generated. Collision energy is absorbed efficiently. Further, by selecting the thickness and shape of the panel 25, it is possible to control the deceleration of the waist part to some extent. Thus, forward movement can be reliably suppressed in a state where the load acting on the waist and chest of the occupant is smaller.

  Further, according to the above configuration, since a push-up mechanism and driving means as in the conventional example are not provided separately, the configuration is simple, and the configuration can be reduced in weight and cost.

  The present invention accepts the forward movement of the occupant's lower back by the receiving member when the vehicle suddenly decelerates due to a frontal collision without deteriorating the sitting comfort. And the occupant can be reliably prevented from moving forward in a state where the load acting on the waist and chest is smaller, which is useful for a safety mechanism for a vehicle seat.

It is a vertical side view which shows schematic structure of one Embodiment of the motor vehicle seat of this invention. It is a decomposition | disassembly partial perspective view of the basic composition of the movement suppression apparatus applied to the embodiment. It is a vertical side view which shows the structure of the principal part of the movement suppression apparatus. It is a fragmentary perspective view which shows the structure of the principal part of the movement suppression apparatus. It is a vertical side view which shows the principal part structure of the state of the middle and the latter period at the time of rapid deceleration by the movement suppression apparatus. In the same embodiment and a prior art example, it is the graph which showed the time change of the deceleration which a dummy chest receives at the time of a collision. It is a vertical side view which shows the principal part structure of the movement suppression apparatus of a prior art example. It is a vertical side view which shows the behavior at the time of rapid deceleration in the movement suppression apparatus of a prior art example.

Explanation of symbols

1 Seat cushion 2 Frame (strength member)
5 Movement restraint device 7 Support pin (support shaft)
11 Connecting member 15 Receiving member 17 Inertial mass 25 Panel

Claims (1)

  In the front part of the seat cushion, a receiving member extending in the width direction of the seat cushion is disposed on the rear side of the vehicle from the support shaft attached to the strength member of the seat cushion, and the vehicle is forward of the support shaft and above the support shaft. An inertial mass extending in the width direction of the seat cushion is disposed on the support member, and the receiving member and the inertial mass are connected to each other by a connecting member pivotally supported at the intermediate portion by a support shaft. A vehicle seat characterized in that a panel is disposed between the two.

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