JP3745181B2 - Crew restraint system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an occupant restraint device provided in a vehicle seat, and more particularly to an occupant restraint device for preventing submarine from preventing a passenger from sliding forward from the lower part of a seat belt when an impact such as a vehicle collision occurs. It is.
[0002]
[Prior art]
There is a so-called submarine phenomenon in which an occupant slips forward from the lower part of the seat belt when an impact such as a vehicle collision occurs, and the waist belt comes off the pelvis. This submarine phenomenon is likely to occur when the occupant sits shallow on the seat or leans over the seat back, and in some cases, the occupant restraint effect of the seat belt may be reduced, or the occupant restraint part may shift. there were.
[0003]
[Problems to be solved by the invention]
Therefore, for example, it is conceivable to prevent the submarine phenomenon by providing a projection at the front end of the seat frame or by increasing the front end by providing a panel, but if the projection or panel is too low, a sufficient effect cannot be obtained, the higher there is a drawback that usually foreign body sensation is ride comfort is deteriorated occurs at the time of use.
[0004]
Therefore, in order to raise the front end of the sheet only when an impact occurs, an airbag is used (see, for example, JP-A-4-33500, JP-A-5-225692, JP-A-2-322497, etc.) There are those that mechanically lift the leading edge of the sheet (see JP-A-1-59436, JP-A-2-31633, JP-A-2-405888, etc.). There is a problem that the layout of the apparatus is difficult.
[0005]
Also, there is a mechanism that lifts the front end of the seat mechanically using a gunpowder actuator (see Japanese Utility Model Laid-Open No. 1-122504). However, depending on the situation, it is necessary to restrain the occupant for a relatively long time. When the thrust of the sheet disappears, the leading edge of the sheet is lowered again, so that it is not always possible to effectively prevent the submarine phenomenon.
[0006]
In addition, in each structure as described above, the structure in which the front end of the seat easily moves up and down even during normal use impairs the feeling of use during normal driving, such as noise generated during vehicle vibration. There is.
[0007]
In order to solve the problems of the prior art as described above, the present invention can surely prevent the submarine phenomenon when a collision occurs, and does not impair the feeling of use during normal use of the sheet, and has a simple structure and free layout. An object of the present invention is to provide an occupant restraint device having a high degree.
[0008]
[Means for Solving the Problems]
According to the present invention, the object described above is based on the casing fixed to the seat frame at the front portion of the seat cushion in order to prevent the occupant from sliding forward from the lower portion of the seat belt when an impact such as a vehicle collision occurs. An anti-skid member that is movably supported so as to protrude upward, a lock mechanism for holding the anti-skid member protruding upward in that state, and supported by the casing to drive the anti-skid member. A power generation device that generates a thrust force that causes the slip prevention member to protrude instantaneously by gas generation means when an impact such as a vehicle collision occurs, and a means for defining an upward protrusion start load of the slip prevention member. This is achieved by providing an occupant restraint device.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0010]
FIG. 1 is a perspective view of a vehicle seat 1 to which the present invention is applied. FIG. 2 is a partially broken side view thereof. A seat frame 3 supported by a seat rail 2 of a vehicle seat 1 fixed to a vehicle body so as to be slidable in the front-rear direction can be fixed at a desired position by a seat adjuster mechanism (not shown). A pair of subassemblies 4 constituting an occupant restraint device are fastened to the seat frame 3 symmetrically.
[0011]
FIG. 3 shows the configuration of the subassembly 4 of the occupant restraint device. Since the left and right subassemblies 4 have the same structure, only one of the left side toward the front of the vehicle will be described, and the other illustration and detailed description will be omitted. The sub-assembly 4 of the occupant restraint device includes a rectangular cylindrical casing 5, an arm 6 as a power transmission means supported by the casing 5 so as to be rotatable in a vertical direction with a support portion 6a, and both arms 6 having both ends thereof. , And a power generation device 8 received in the casing 5 to drive the slide-out prevention member 7 via the arm 6, and in the vicinity of the operating end of the power generation device 8. The one-way lock mechanism 9 supported by the casing 5 and the slip-out prevention member protrusion start load defining means 10 (FIGS. 4 and 5) attached to the one-way lock mechanism 9 are configured. A free end portion of a piston rod 11b of a piston member 11 to be described later of the power generating device 8 is connected to a long hole 6b provided at a position offset from the support portion 6a of the arm 6 through a guide hole 5c with a pin 12. . The power generator 8 and the one-way lock mechanism 9 are fixed and held in the casing 5 by caulking the lid 5b after receiving them in the main body 5a of the casing 5.
[0012]
As shown in FIG. 4, the power generation device 8 includes a cylinder 13 fixed to the seat frame 3 through a casing 5, a piston main body 11 a that is removably received in an inner hole 13 a of the cylinder 13, and a piston And a gas generator 14 received on the base end side of the main body 11a. An elastic seal member 15 and a compression coil spring 16 are interposed between the piston body 11a and the gas generator 14, and always urge the piston body 11a in the operating direction (projecting direction). The seal member 15 may be any member that has elasticity in the axial direction and can reliably prevent leakage when gas is generated.
[0013]
Here, the gas generator 14 has a proximal end large diameter portion 14a and a distal end small diameter portion 14b from which gas is ejected, and a stepped portion 14c therebetween has a cylinder 13 via an annular seal member 15 having elasticity. And abuts and engages with the step portion 13b formed at the same, and enters the compression coil spring 16 through the central hole of the seal member 15 to form a spring seat thereof. In addition, the compression coil spring 16 has the distal-side small-diameter portion 14b of the gas generating device 14 so as to secure a gap between the piston main body 11a and the distal-end-side small-diameter portion 14b of the gas generating device 14 even when it is contracted most. Go. As a result, there is no fear that the piston body 11a hits the distal end of the small diameter portion 14b of the distal end side of the gas generator 14 even if an external force is generated that moves the piston body 11a toward the gas generator 14 during or after assembly. Damage and deformation of the gas generator 14 can be prevented. Further, the leading end side small diameter portion 14b of the gas generator 14 enters the compression coil spring 16, so that the dead space can be filled, and the initial volume at the time of gas generation can be reduced. You can use less medicine.
[0014]
The piston main body 11a is in contact with the wall surface of the inner hole 13a via an O-ring 17. A piston rod 11b whose free end is coupled to the arm 6 abuts on the piston body 11a from the axial direction, and the piston member 11 is constituted by the piston body 11a and the piston rod 11b. Forming Here, the piston body 11a and the piston rod 11b, and the recesses of a curvature formed in the axial end surface of the piston body 11a, the shaft end of the piston rod 11b slightly at a small radius of curvature of the semi-spherical than this Are engaged (abutted) by contacting at the central portion with the projected portion, whereby both are automatically aligned, and the piston rod 11b is not twisted in the cylinder 13, and energy loss and There is no worry of gas leakage due to eccentricity. Actually, it may not be a curved surface but may be tapered. In that case, it is preferable that the taper of the concave portion is gentler than the taper of the convex portion.
[0015]
Further, as described above, the compression coil spring 16 always urges the piston body 11a in the operation direction, so that the piston rod 11b is also urged in the operation direction, such as a connecting portion between the piston rod 11b and the arm 6 or the like. Jata is absorbed. The spring is not limited to a compression coil spring, but may be a disc spring or a rubber elastic body.
[0016]
A one-way lock mechanism 9 is provided at the tip of the power generation device 8. The one-way lock mechanism 9 includes a plurality of engagement pieces 19 that surround the outer periphery of the piston rod 11 b inside the casing 18 fixed to the casing 5 so as to cover the outer periphery of the piston member 11, and these engagement pieces 19. It has a structure that receives a spring 20 biased toward the base end side of the piston member 11, that is, the cylinder 13 side. The outer peripheral surface of each engagement piece 19 is gradually reduced in diameter from the free end side to the base end side of the piston member 11. Further, the casing 18 includes a tapered portion 18b that gradually narrows from the large diameter portion 18a. Therefore, in the state of FIG. 4, each engagement piece 19 is urged by the spring 20 and is pressed by the taper portion 18 b to contact the outer peripheral surface of the piston member 11, but moves in a direction in which the piston member 11 protrudes. At this time, each engagement piece 19 also moves in the direction in which the piston member 11 protrudes against the urging force of the spring 20 to reach the large diameter portion 18a and away from the piston member 11, so that the piston member 11 moves freely. . On the other hand, when the piston member 11 is moved in the direction of immersing, the engagement pieces 19 are moved to the taper portion 18b by the urging force of the spring 20 so as to contact the outer peripheral surface of the piston member 11 and fix them. It has become. Here, an annular groove or a thread groove 11c is formed on the outer peripheral surface of the piston rod 11b. An annular groove or a screw groove 11c corresponding to the groove 11c is also formed on the inner peripheral surface of each engagement piece 19. Therefore, when trying to move the piston member 11 in the immersive direction, the inner peripheral surface of each engagement piece 19 and the outer peripheral surface of the piston member 11 are engaged, and both are firmly fixed and the position is maintained. It is supposed to be.
[0017]
The tip of the one-way lock mechanism 9 is provided with a slip-out prevention member protrusion start load defining means 10 that forms a lid of the casing 18. This slip-out prevention member protrusion start load defining means 10 is fixed by being fitted to the tip end portion of the casing 18 and engaging the engaging portion 10a of the slip-out prevention member protrusion start load defining means 10 in the engagement groove 18c. ing. An opening 10b in which an annular groove or a thread groove into which the groove 11c of the piston rod 11b is engaged is formed at the center of the slip-out prevention member protrusion start load defining means 10. A thin portion 10c is formed around the opening 10b. Thereby, even if it tries to move in the direction in which the piston member 11 protrudes in the normal state, the inner peripheral surface of the opening 10b and the annular groove or screw groove 11c on the outer peripheral surface of the piston member 11 are engaged. It comes to hold. However, when a load larger than a predetermined load, that is, a thrust by the gas generator 14, is applied, the thin portion 10c is broken and the piston member 11 protrudes.
[0018]
As described above, the power generation device 8 before the power generation device 8 is sub-assembled is formed by attaching the slip start prevention member protrusion start load defining means to the power generation device 8 or by arranging it close to the power generation device 8 to act on the piston member 11. The piston member 11 can be prevented from falling off.
[0019]
The left and right arms 6 are firmly connected to each other by a slip-out preventing member 7 extending in the left-right direction of the vehicle. The sub-assemblies 4 of the occupant restraint devices are bolted to the seat frame 3 by the fastening portions 3a and the support portions 5d.
[0020]
The occupant restraint device comprises the sub-assemblies 4 of the left and right occupant restraint devices, impact generation detecting means and control means comprising an acceleration sensor (not shown) and the like.
[0021]
The occupant restraint device can be assembled to the existing seat even when the seat is assembled. For example, when the seat is assembled at the same time when the seat is to be welded, the explosive is used after the welding process is completed. The sub-assembly 4 of the occupant restraint device having the power generation device 8 with built-in can be assembled. Further, in this configuration, the seat frame 3 is assembled through a holder that can slide on the seat rail 2, but a seat that can be tilted or lifted is assembled to the assembly bracket.
[0022]
Next, the operation point of this embodiment will be described. First, during normal travel, since the inner peripheral surface of the opening 10b and the thread groove 11c on the outer peripheral surface of the piston member 11 are engaged as described above, the piston member 11 and the arm 6 engaged therewith, The anti-slip member 7 keeps its position without inadvertent movement. When an impact such as a collision is detected by a sensor or the like (not shown), gas is generated in the gas generator 14, and the internal pressure of the cylinder 13 is suddenly increased to generate thrust in the protruding direction of the piston member 11. The load is input to the opening 10c of the anti-slip member protrusion start load defining means 10 engaged with the annular groove or the screw groove 11c on the free end side of the piston member 11, that is, on the free end side of the piston rod 11b. The thin portion 10d is destroyed, and the free end side of the piston member 11 protrudes from the cylinder 13 instantaneously. Then, the arm 6 connected to the free end of the piston rod 11b rotates clockwise as indicated by an imaginary line in FIG. 2, and the anti-slip member 7 moves upward (protrudes). It will be bulged to prevent the occupant's submarine phenomenon. Even if the gas generation by the gas generator 14 ends and the driving force of the power generator 8 disappears, the one-way lock mechanism 9 does not cause the anti-slip member 6 moved upward to return downward, and the effect of preventing the submarine phenomenon continues. To do.
[0023]
In this configuration, the same one-way lock mechanism is provided on both the left and right sides, and both sides are supported with respect to the load from the occupant, but only one is sufficient as long as the strength can be secured. Different types of mechanisms may be used on the left and right. For example, the one-way lock device may be provided on one side, and the ball one-way lock device or the like that can be locked in a stepless position may be provided on the other side. Further, if the power generating devices are provided on both the left and right sides, one power generating device can be reduced in size, and the devices are distributed on both sides of the seat, so that the size is not locally increased.
[0024]
Further, as described above, by providing the structure for acting on the piston member 11 by attaching or closely arranging the slip start preventing member protrusion start load defining means to the power generation device 8, the power generation before the power generation device 8 is subassembled is generated. The piston member 11 can be prevented from falling off from the device 8.
[0025]
FIG. 6A is a partial cross-sectional view showing another configuration example of the slip-out prevention member protrusion start load defining means 10. In this configuration, the slip-out prevention member protrusion start load defining means 10 is engaged with the opening 13c of the cylinder 13 of the power generation device 8 in a lid shape. An annular groove or screw groove that engages with an annular groove or screw groove 11c on the outer peripheral surface of the piston member 11 similar to the above is formed in the central opening 10d. Further, as shown in FIG. 6 (b), a thin portion 13d may be formed in the opening 13c of the cylinder 13, and this may be used as the anti- slip member protrusion start load defining means. Note that the groove of the anti-slip member protrusion start load defining means that engages with the annular groove or the screw groove 11c does not have to be provided on the entire circumference, and is partially formed at one place or a plurality of places. Also good.
[0026]
FIG. 7A to FIG. 7D are side views showing another configuration example of the anti-slip member protrusion start load defining means 10. In this configuration, the protrusion 5e is provided in the guide hole 5c for guiding the pin 12 to serve as a slip start prevention member protrusion start load defining means. 7 (a) and 7 (c) are provided with projections 5d on one side, and FIGS. 7 (b) and 7 (d) are provided with projections 5d on both sides. FIGS. 7 (c) and 7 (d) are projections. A recess 5e is further formed so that 5d is easily deformed.
[0027]
FIG. 8A is a side view showing another configuration example of the slip-out prevention member protrusion start load defining means. In this configuration, a pin 21, which is different from the pin 12, is attached to the arm 6 so as to come into contact with the end of the guide hole 5 c when the arm 6 starts to rotate, and serves as a slip start prevention member protrusion start load defining means. Yes. As shown in FIG. 8 (b), a hole may be separately provided in the casing 5, and another pin 21 may be passed through the hole to serve as a slip start prevention member protrusion start load defining means. In either case, the pin 21 may be a rivet or spring pin. Moreover, even if the pin 21 is made to penetrate the arm 6 having a substantially U-shaped cross section, the pin 21 may be engaged only at one wall portion.
[0028]
FIG. 9A and FIG. 9B are side views showing another configuration example of the anti-slip member protrusion start load defining means. In this configuration, projecting pieces 22a and 22b that engage with each other are formed on the casing 5 and the arm 6, and the projecting pieces 22a and 22b are deformed as the arm 6 rotates, so that the slip-out prevention member protrusion start load defining means is provided. It is said.
[0029]
10 (a) to 10 (e) are perspective views showing another configuration example of the slip-out prevention member protrusion start load defining means, and FIGS. 10 (f) to 10 (j) are sectional views thereof. In this configuration, a projection or a projecting piece 23 that interferes with the other is formed on either the casing 5 or the arm 6 to serve as a slip start prevention member protrusion start load defining means. 10 (a) to 10 (c) show protrusions or protrusions 23 formed on the arm 6 and engage with the guide holes 5c. FIGS. 10 (d) and 10 (e) show protrusions or protrusions on the casing 5. A projecting piece 23 is formed and engaged with the edge of the arm 6. In addition to this, any structure that interferes when the arm 6 starts to rotate can be used as the slip start prevention member protrusion start load defining means.
[0030]
In each of the above-described configurations, one sub-assembly 4 is provided with one anti-slip member protrusion start load defining means. However, a plurality of anti-skid member protrusion start load defining means having different structures may be provided. Thus, the set load of each load defining means can be reduced.
[0031]
FIG. 11 is a view similar to FIG. 1 showing another configuration of the present invention. In this configuration, the casing 5 constitutes a part of the seat frame, and the number of parts is reduced and the weight is reduced. Other configurations are the same as described above. Conversely, the casing 5 may be formed by a seat frame.
[0032]
FIG. 12 is a view similar to FIG. 2 showing another configuration of the present invention. In this configuration, the power generating device 8 of one of the subassemblies 4 in the configuration of FIG. 2 is used in the pretensioner device 31 for automatically increasing the tension of the seat belt in the event of a vehicle collision or the like. It also serves as a power generation device for moving the buckle 32 to the side where the seat belt is tensioned. The one-way lock mechanism 9 also serves as a lock mechanism for maintaining the seat belt buckle 32 in the pretensioner device 31 in a state where the seat belt is moved to the tension side. Further, in order to prevent the seat belt buckle 32 from inadvertently moving during normal use, the means for defining the movement start load of the buckle 32 is replaced with the anti-slip member protrusion start load defining means 10 or another example thereof (FIGS. 6 to 6). Fig. 10) also serves. As a result, the power generating device, the lock mechanism, and the means for defining the starting load of the operation can be shared, and the number of parts can be reduced.
[0033]
Specifically, the base end portion of the buckle 32 is connected to the free end portion of the piston member 11 of the power generation device 8 via the link member 33 and the rotating arm 34. As a result, when an impact such as a collision is detected by a sensor (not shown) during traveling, gas is generated by the gas generator 14 and the internal pressure of the cylinder 13 is rapidly increased to thereby increase the free end side of the piston member 11. As described above, the slip-out prevention member 7 moves upward (projects) and at the same time the buckle 32 is pulled downward (imaginary line), and tension is applied to the seat belt to restrain the occupant's restraining force. To strengthen.
[0034]
【The invention's effect】
As is apparent from the above description, according to the vehicle occupant restraint device according to the present invention, the front portion of the seat cushion is used to prevent the occupant from sliding forward from the lower portion of the seat belt when an impact such as a vehicle collision occurs. The anti-skid member movably supported by the casing fixed to the seat frame so as to be able to protrude upward, the lock mechanism for holding the anti-slip member protruding upward, and the anti-slip member driven. Therefore, it is constituted by a power generation device that is supported by the casing and generates a thrust force that causes the slip prevention member to protrude instantaneously by the gas generation means when an impact such as a vehicle collision occurs, and a means that defines the upward protrusion start load of the slip prevention member. Therefore, submarine phenomenon can be reliably prevented when a shock such as a vehicle collision occurs, and the seat feels normal during use. That there is no compromising.
[Brief description of the drawings]
FIG. 1 is a partially exploded perspective view of a vehicle seat device to which the present invention is applied.
2 is a partially cutaway side view of the vehicle seat device of FIG. 1; FIG.
FIG. 3 is an exploded perspective view showing a configuration of a subassembly of an occupant restraint device to which the present invention is applied.
FIG. 4 is a cross-sectional view showing a structure of a power generation device of an occupant restraint device to which the present invention is applied.
5 is a perspective view of the main part of FIG. 4;
FIGS. 6A and 6B are cross-sectional views of main parts showing another configuration example of an occupant restraint device to which the present invention is applied.
FIGS. 7A to 7D are side views of main parts showing another configuration example of an occupant restraint device to which the present invention is applied.
FIGS. 8A and 8B are main part side views showing another configuration example of an occupant restraint device to which the present invention is applied.
FIG. 9A is a side view of an essential part showing another configuration example of an occupant restraint device to which the present invention is applied, and FIG. 9B is an exploded perspective view of FIG.
FIGS. 10A to 10E are perspective views of main parts showing another configuration example of an occupant restraint device to which the present invention is applied, and FIGS. 10F to 10J are views of FIGS. FIG.
FIG. 11 is a perspective view similar to FIG. 1, showing another configuration example of an occupant restraint device to which the present invention is applied.
FIG. 12 is a side view similar to FIG. 2 showing another configuration example of an occupant restraint device to which the present invention is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat rail 3 Seat frame 3a Fastening part 4 Subassembly 5 of occupant restraint device Casing 5a Main body part 5b Cover part 5c Guide hole 5d Support part 5e Protrusion 5f Recess 6 Arm 6a Support part 6b Long hole 7 Sliding prevention member 8 Power generator 9 One-way lock mechanism 10 Sliding out prevention member protrusion start load defining means 10a Engaging portion 10b Opening 10c Thin wall portion 10d Center opening 11 Piston member 11a Piston body 11b Piston rod 11c Screw groove 12 Pin 13 Cylinder 13a Inner hole 13b Step Part 13c Working end opening 13d Thin part 14 Gas generator 14a Base end measuring large diameter part 14b Tip side small diameter part 14c Step part 15 Sealing member 16 Compression coil spring 17 O-ring 18 Casing 18a Large diameter part 18b Taper part 18c Engaging groove 19 Engagement piece 20 Spring 21 Pins 22a, 22b Projection piece 23 Projection piece 31 Pretensioner device 32 Buckle 33 Link member 34 Rotating arm

Claims (3)

To the occupant when an impact occurs, such as a vehicle collision is prevented from slipping forwardly from a lower portion of the seat belt, it is movable supported by a fixed member forming the seat frame and integrally so as to be protrude above side Te to the front of the seat cushion It was a Suberidashi preventing member, and a locking mechanism for maintaining the Suberidashi prevention member that issued collision to that state, is supported by a fixed member integral with said seat frame so as to drive the Suberidashi preventing member, such as a vehicle collision an occupant restraint device having a power generator for generating a thrust to project the instant at the Suberidashi preventing member when an impact occurs,
The power generating device receives the piston member in a cylinder, and rapidly increases the internal pressure of the cylinder by gas generating means to generate a thrust that causes the piston member to protrude from the cylinder instantaneously. Either one of the cylinders engages with a movable member integral with the anti-slip member, and the other engages with a fixed member integral with the seat frame;
In order to hold the slip-out prevention member in a normal position at a normal time, a coupling portion with the cylinder and a coupling portion with the piston member are formed as a common member, and the coupling portion with the cylinder and the piston member An occupant restraint device comprising: a slip-out prevention member protrusion start load defining means configured to divide the connection portion with a predetermined load . In order to prevent the occupant from sliding forward from the lower part of the seat belt when an impact such as a vehicle collision occurs, it is movably supported by a fixed member integrated with the seat frame so that it can protrude upward at the front part of the seat cushion. It is supported by a slip-preventing member, a lock mechanism for maintaining the protruding anti-slip member in that state, and a fixing member that is integrated with the seat frame to drive the anti-slip member, and generates an impact such as a vehicle collision. An occupant restraint device having a power generation device for generating a thrust force to project the slip-out prevention member instantaneously at times,
The movable member supported by a fixed member integrated with the seat frame integrally with the anti-slip member and the fixed member integrated with the seat frame are engaged with each other to prevent the anti-slip operation under normal conditions. An occupant restraint device comprising a slip-out prevention member protrusion start load defining means configured to hold a member in a normal position and to be deformed by a predetermined load to release the engagement. In the pretensioner device for automatically increasing the tension of the seat belt in the event of a vehicle collision or the like, the power generation device moves the buckle of the seat belt to the side where the seat belt is tensioned. Doubles as
The occupant restraint device according to claim 1 or 2, wherein the slip-out prevention member protrusion start load defining means also serves as a means for defining a movement start load of the buckle of the pretensioner device.

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