JP3662800B2 - Crew restraint device and power generation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is used for an occupant restraint device assembled in a vehicle seat device and a high-speed operation mechanism such as the device to prevent the occupant from sliding forward from the lower part of the seat belt when an impact such as a vehicle collision occurs. The present invention relates to a power generation device for instantaneously driving a suitable driven member.
[0002]
[Prior art]
Conventionally, there is a so-called submarine phenomenon in which an occupant slips forward from a lower portion of a seat belt when an impact such as a vehicle collision occurs, and the waist belt comes off from 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]
For example, it may be possible 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, sufficient effects cannot be obtained, and if it is increased There is a drawback that a feeling of foreign matter is generated during normal use and the ride comfort is poor.
[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-5-229378, JP-A-7-81466, JP-A-3-227745, etc.) The one that mechanically lifts the front end of the seat (see Japanese Utility Model Laid-Open No. 2-149328, Japanese Utility Model Laid-Open No. 3-121947, Japanese Utility Model Laid-Open No. 4-93222, etc.), and a high-pressure gas generated by a chemical reaction as a power generator In some cases, the front end of the sheet is mechanically lifted (see Japanese Utility Model Publication No. 3-61440).
[0005]
A conventional power generation apparatus 50 using high-pressure gas is shown in FIG. An inner hole 51a having a reduced diameter portion 51b is formed in the middle portion of the cylinder 51 fixed to the base member of the seat, and a piston 52 is received at one end portion thereof. For example, the free end portion 52a of the piston 52 integrally held by the main body portion by screwing protrudes from one end opening of the cylinder 51 and engages with the seat front end portion via a link member or the like, and the base end portion 52b is The diameter is slightly increased, and the inner peripheral surface of the cylinder 51 is in contact with the O ring 53. A cap 54 having an opening 54 a at the center is fastened to one end opening of the cylinder 51. The opening 54 a functions as a bearing when the piston 52 moves while being in sliding contact with the intermediate portion of the piston 52.
[0006]
A gas generator 55 is received in the other end portion of the inner hole 51 a of the cylinder 51. The rear end opening of the cylinder 51 is caulked through a pressing plate 57 that also serves as a seal, and prevents the gas generator 55 from coming off.
[0007]
[Problems to be solved by the invention]
In the above structure, the piston 52 is assembled in a state where it is most immersed in the inner hole 51a of the cylinder 51. However, if the gap between the base end portion 52b of the piston 52 and the stepped portion of the reduced diameter portion 51b is small, the dimensional error of the apparatus components. (For example, the connecting part of the link member, the base member and the cylinder receiving part of the seat), or when the positional deviation of the link member at the time of assembly is large, it cannot be absorbed, and there is a problem that the assembly becomes difficult. In addition, after assembly, if there is rattling at the connecting portion between the free end portion 52a of the piston 52 and the link member or the connecting portion between the link member or the like and the sheet leading end portion, the so-called ball-throw is caused at the portion where the rattling occurs during operation. A phenomenon occurs, and the impact force causes local plastic deformation in each part, resulting in energy loss of high-pressure gas.
[0008]
On the other hand, in order to prevent the occupant from being thrown forward in the event of a collision accident, the buckle with a seat belt that restrains the movement of the occupant is rapidly moved in the tension direction of the seat belt. There has been proposed a pretensioner device that increases the restraining force of the seat belt (see US Pat. No. 4,705,296, etc.).
[0009]
Such pretensioner devices include those using a power generation device that uses high-pressure gas generated by a chemical reaction to pull the buckle, as described in, for example, Japanese Patent Laid-Open No. 10-181529. However, there is a problem that rattling occurs as described above.
[0010]
Therefore, it is preferable to incorporate a structure that absorbs this in each device. However, depending on the structure, there is a problem that the device becomes large.
[0011]
The present invention has been devised to solve the problems imposed on the prior art, and its purpose is to provide high operating reliability, easy assembly, and a more compact occupant restraint. An object of the present invention is to provide a power generation apparatus suitable for use in the apparatus and these high-speed operation mechanisms.
[0012]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention is capable of projecting upward to a casing fixed to the seat frame when an impact occurs 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. In an occupant restraint device in which a movable supported anti-skid member protrudes upward with a power generator and is held with a lock mechanism at that position, the slidable anti-skid member is received in the cylinder and one end is directly or indirectly attached to the anti-skid member. Using a power generator with a structure in which the engaging piston member protrudes with gas generating means for rapidly increasing the internal pressure of the cylinder, and the piston member is biased with a spring in the protruding direction. Furthermore, let the tip of the gas generating means enter the center through hole of the spring. The structure is as follows.
[0013]
Also, a piston member that engages the driven member directly or indirectly in a cylinder fixed to drive the driven member instantaneously is received, and the internal pressure of the cylinder is also received by the gas generating means received in the cylinder. This piston member and gas are supported by a step portion provided in the cylinder in the power generating device that moves the piston member in the protruding direction by rapidly increasing the piston member and biases the piston member in the protruding direction. A spring arranged between the generating means and the tip of the gas generating means was inserted into the central through hole of the spring.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0015]
FIG. 1 is a perspective view of a vehicle seat 1 according to a first embodiment 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.
[0016]
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 right 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 supported on the casing 5 by a collar 6a in a support portion 5d so as to be rotatable in the vertical direction, and both arms 6 having both ends thereof. A slip-out preventing member 7 that is engaged and forms a bar shape, a power generation device 8 that is received in the casing 5 to drive the slip-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 6) attached to the one-way lock mechanism 9 are configured. By engaging a pin 12 attached to the free end portion of the piston rod 11b of the piston member 11 to be described later of the power generating device 8 with a long hole 6b provided at a position offset from the support portion 5d of the arm 6, The free end portion of the rod 11 b is connected to a position offset from the support portion 5 d of the arm 6. Further, the pin 12 is guided in the guide hole 5c in the direction in which the piston rod 11b formed in the casing 5 protrudes and retracts. 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. The collar 6a and the pin 12 are prevented from coming off by caulking and widening the tips.
[0017]
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 It has a gas generator 14 as a gas generating means 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.
[0018]
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. In contact with and engaging with the step portion 13 b formed in the step, the central portion of the compression coil spring 16 enters the central passage hole of the compression coil spring 16. Further, the step portion 14 c forms a spring seat of the compression coil spring 16 through the seal member 15. The distal-side small-diameter portion 14b of the gas generator 14 has a gap in the central through hole of the compression coil spring 16 between the piston body 11a and the distal-end-side small-diameter portion 14b of the gas generator 14 even when it is contracted most. It is in the extent to secure. 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 tip side small diameter portion 14b of the gas generating device 14 also fills the inner hole of the stepped portion 13b of the cylinder 13 and further enters the compression coil spring 16, thereby filling the dead space, and at the time of gas generation The initial volume can be reduced, that is, the propellant used for the gas generator 14 can also be reduced.
[0019]
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. Here, the piston body 11a and the piston rod 11b are, for example, a spherical concave portion having a curved surface with a curvature toward the center of the axis, and a spherical convex portion having a curved surface with a slightly smaller curvature. Engagement (contact) is made by contact at the center portion, so that both are automatically aligned, and the piston rod 11b is not twisted in the cylinder 13, and there is a risk of gas leakage due to energy loss or eccentricity. There is no.
[0020]
In practice, as shown in FIG. 5, the piston body 11a and the piston rod 11b have a tapered recess that gradually decreases in diameter toward the center of the axis, and a taper that slightly decreases in diameter from this taper. You may engage by the contact in the center part with the convex part made. The concave portion may be tapered and the convex portion may be curved.
[0021]
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. The operating end opening 13c of the cylinder 13 is reduced in diameter so that the outer peripheral surface of the intermediate portion of the piston rod 11b is in sliding contact.
[0022]
In order to assemble the power generation device 8, first, the piston body 11a and the compression coil spring 16 are inserted from the side opposite to the operating end opening 13c of the cylinder 13, that is, the base end side opening, and further the seal member 15 and the gas generation The device 14 is inserted and the proximal end side opening portion of the cylinder 13 is caulked through the pressing plate. Since the assembly direction can be unified in this way, and the caulking is only required at one base end side opening of the cylinder 13, the ease of assembly is improved. At this time, the elastic sealing member 15 is interposed between the step portion 13b of the cylinder 13 and the step portion 14c of the gas generator 14, so that the dimension A of the gas generator 14, the caulking dimension B of the cylinder 13 and the like are increased. Even if it is scattered, it can be absorbed by the elastic deformation of the seal member 15. Therefore, even if it is assembled by caulking, there is no problem such as damage or deformation of the gas generator 14.
[0023]
At this time, if the piston rod 11b is not assembled to the power generation device 8 and is handled as a separate part, the piston main body 11a moves in the cylinder 13 even if the gas generation device 14 is activated for some reason. Therefore, the handling is easy. Further, since the piston main body 11a is light, it is not necessary to provide a strong cap on the operating end opening 13c of the cylinder 13, and it is only necessary to reduce the diameter of the opening. . As a result, the occupant restraint device can be further reduced in size and thickness, and the degree of freedom in arrangement of the device and ease of assembly are improved. Furthermore, since the cutting for providing the cap is not necessary, the ease of manufacturing the cylinder is improved.
[0024]
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 at that position. It has become.
[0025]
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. Also, when the subassembly 4 is transported before assembling, the piston member 11 does not fall off, and the handling ease is improved.
[0026]
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 support portions 5d and the fastening portions 5e.
[0027]
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.
[0028]
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. It is preferable to assemble the sub-assembly 4 of the occupant restraint device having the power generation device 8 in which is installed. 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.
[0029]
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 7 moved upward to return downward, and the effect of preventing the submarine phenomenon continues. To do.
[0030]
In this configuration, the same one-way lock mechanism is provided on both the left and right sides, and both sides are supported against the load from the occupant. However, only one is required as long as the strength can be secured. May be used. 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. Similarly, if the power generation devices are provided on both the left and right sides, one power generation device can be reduced in size, and there is an advantage that the device is distributed on both sides of the seat and does not increase in size locally. If it is obtained, only one of them may be used.
[0031]
FIG. 7 is a perspective view of a vehicle seat in which a seat belt pretensioner device according to a second embodiment to which the present invention is applied is incorporated. In FIG. 7, the seat belt 23 drawn upward from the ELR device 22 fixed to the lower portion of the center pillar 21 in the vehicle interior extends downward after passing through the through ring 24 attached to the upper portion of the center pillar 21. The end portion 26 is fixed to the rear side surface of the seat 25. A tongue plate 27 is provided in a portion of the seat belt 23 between the through ring 24 and the end portion 26 so as to be movable along the seat belt 23. Further, a buckle 28 is attached to the side surface of the seat opposite to the fixing point of the seat belt end portion 26 via a pretensioner device P.
[0032]
The occupant seated on the seat 25 pulls out the seat belt 23 from the ELR device 22 and connects the tongue plate 27 to the buckle 28, so that the seat belt 23 is stretched from the occupant's shoulder to the chest and waist.
[0033]
The pretensioner device P is for automatically increasing the tension of the seat belt 23 in the event of a vehicle collision or the like, and for fixing the entire device to the side surface of the seat 25 as shown in FIGS. A base plate 31, an arm 32 having one end pivotally attached to the base plate 31 and the other end connected to the anchor portion 28 a of the buckle 28, and the power generator 8 according to the present invention substantially fixed to the base plate 31, A link member 34 having one end connected to the operating end of the power generating device 8 and the other end connected to a position at an appropriate radial distance from the pivot center on the pivot end side of the arm 32, and the arm 32 And a one-way lock mechanism 35 composed of a known ball one-way lock mechanism or the like for prescribing the rotation direction to only one side.
[0034]
A center shaft 36 that supports the arm 32 is attached to the base plate 31. One end of the arm 32 is rotatably supported with respect to the center shaft 36, and an anchor pin 37 is fixed to the other end by projection welding or the like. And the anchor part 28a of the buckle 28 is supported by the protrusion part from the side surface of the arm 32 of the anchor pin 37 so that rotation is possible.
[0035]
One end of the link member 34 is connected to the operating end of the power generation device 8 similar to that of the first embodiment, that is, the free end portion of the piston rod 11b so as to be relatively rotatable, and the vicinity of the other end is relatively rotatable to the arm 32. It is connected to. The C-shaped portion 34a at the other end of the link member 34 engages with the pin 38 to form a fuse for preventing the arm 32 from being inadvertently rotated.
[0036]
Here, in this embodiment, since the one-way lock mechanism 35 and the fuse (C-shaped portion 34a, pin 38) are separately provided, as shown in FIG. (Member) Although the protrusion start load defining means 10 is not provided, conversely, the one-way lock mechanism 9 and the protrusion start load defining means 10 are provided in the power generating device 8, and the one-way lock mechanism 35 and the fuse (C-shaped portion 34a, pin It goes without saying that 38) may be omitted. Since the structure of the other part of the motive power generator 8 is the same as that of 1st Embodiment, the description is abbreviate | omitted. As shown in FIG. 10, the operating end opening 13c and the stepped portion 13b of the cylinder 13 may be reduced in diameter by swaging so that the outer peripheral surface of the intermediate portion of the piston rod 11b is in sliding contact.
[0037]
When the power generation device 8 is assembled to the pretensioner device P, the cylinder 13 is fixed to the base plate 31, the piston rod 11 b is inserted from the operating end opening 13 c of the cylinder 13, and the free end portion is attached to the link member 34 with a pin 39. Link.
[0038]
Below, the operation | movement point of this embodiment is demonstrated. First, when a vehicle collision is detected by a deceleration sensor (not shown), the propellant of the gas generator 14 is ignited, and the thrust of the piston member 11 pushed out by the combustion gas pressure generated at this time causes the link member 34 to move. To the arm 32 and converted into the rotational force of the arm 32. Then, the buckle 28 is pulled in with the rotation of the arm 32 (see FIG. 11), and tension is applied to the seat belt 23 to increase the occupant's restraining force. At this time, even if the combustion gas pressure disappears, the one-way lock mechanism 35 prevents the arm 32 from reversing, so that the seat belt 23 is prevented from loosening after the combustion gas pressure disappears.
[0039]
FIG. 12 is a view similar to FIG. 10 showing a modification of the power generating device having the above-described configuration. The outer diameter of the cylinder 13 is made substantially constant over its entire length, and the thickness of the inner hole 13a is changed. Part 13b is formed. This facilitates the assembly of the power generator 8. The other structure is the same as that of FIG.
[0040]
FIG. 13 is a view similar to FIG. 9 showing a modification of the above-described configuration. A flange 13d is formed in the vicinity of the operating end opening 13c of the cylinder 13, and the reaction force at the time of gas generation is not limited to the rear end of the cylinder 13. The force can be dispersed by receiving the flange 13d. The other structure is the same as that of FIG.
[0041]
FIG. 14 is a view similar to FIG. 2 showing a third embodiment to which the present invention is applied. In this configuration, in addition to the configuration of the occupant restraint device of FIGS. 2 to 6, a pretensioner device 41 for automatically increasing the tension of the seat belt in the event of a vehicle collision or the like is provided. Since the configuration of the subassembly 4 (the structure of the power generation device 8, the one-way lock mechanism 9, and the protrusion start load defining means 10) is the same as that in the first embodiment, its illustration and description are omitted. In this configuration, the power generation device 8 of one of the subassemblies 4 in the configuration of the passenger restraint device in FIG. 2 moves the buckle 42 of the seat belt to the side where the seat belt is tensioned in the pretensioner device 41. Also serves as a power generation device. The one-way lock mechanism 9 also serves as a lock mechanism that holds the buckle 42 of the seat belt in the pretensioner device 41 in a state where the buckle 42 is moved to the side where the seat belt is tensioned. Further, in order to prevent the buckle 42 of the seat belt from inadvertently moving during normal use, the slip-out prevention member protrusion start load defining means 10 also serves as a means for defining the movement start load of the buckle 42. As a result, the power generation 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.
[0042]
Specifically, the base end portion of the buckle 42 is connected to the free end portion of the piston member 11 of the power generation device 8 via the link member 43 and the rotating arm 44. 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 shown above, the slip-out prevention member 7 moves upward (projects) (imaginary line) and at the same time the buckle 42 is pulled downward (imaginary line), and tension is applied to the seat belt. To increase the restraint of passengers.
[0043]
In each of the above configurations, the power generation device according to the present invention is applied to an occupant restraint device or a seat belt pretensioner device that prevents a submarine phenomenon. Needless to say, the present invention can be easily applied to an application that generates an instantaneous driving force, such as a device that moves the handle forward in order to prevent the above.
[0044]
【The invention's effect】
As described above, according to the present invention, in order to prevent an occupant from sliding forward from the lower part of the seat belt when an impact such as a vehicle collision occurs, the movable support is supported so as to be able to project upward to the casing fixed to the seat frame when the impact occurs. The occupant restraint device that projects the anti-skid member with the power generator and holds it with a lock mechanism at that position, and is received in the cylinder and one end is directly or indirectly engaged with the anti-skid member The size of the occupant restraint system is increased by using a power generator with a structure that causes the piston member to protrude with gas generating means that rapidly increases the internal pressure of the cylinder and biasing the piston member with a spring in the protruding direction. It ’s gone without it.
[0045]
A piston member that is directly or indirectly engaged with the driven member is received in a cylinder fixed to instantaneously drive the driven member, and the internal pressure of the cylinder is rapidly increased by the gas generating means also received in the cylinder. The piston member and the gas generating means are supported by a step portion provided in the cylinder and urged in the protruding direction in the cylinder of the power generation device for moving the piston member in the protruding direction. And the tip of the gas generating means is inserted into the central through hole of the spring, so that extra space can be used effectively, the power generator can be downsized and gas can be generated. The initial volume at the time can be reduced, that is, the propellant used for the gas generating means can also be reduced.
[0046]
Further, the distal end portion of the gas generating means protrudes into the central through hole of the spring means so as to ensure a gap between the piston member and the distal end portion from which the gas of the gas generating means is ejected even when the spring means is contracted most. Thus, the gas generating means and the spring means partially overlap to shorten the overall length of the cylinder, or to increase the piston stroke with the same length, or to increase the gas generating means and to install the piston and gas without providing a separate spacer. Interference with the generating means can be prevented. Further, the gas generating means is composed of a base end side large diameter portion and a distal end side small diameter portion, and the step portion therebetween is a spring seat, so that the number of parts can be reduced and the step portion of the gas generating means has elasticity. By engaging the step formed on the cylinder via the seal member, it is possible to absorb dimensional errors and assembly errors between the cylinder and the gas generating means.
[Brief description of the drawings]
FIG. 1 is a partially exploded perspective view of a vehicle seat device according to a first embodiment 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.
FIG. 5 is a cross-sectional view showing another structure of the power generation device of the occupant restraint device to which the present invention is applied.
6 is a perspective view of the main part of FIG. 4;
FIG. 7 is a seat belt pretensioner device equipped with a power generation device according to a second embodiment to which the present invention is applied, and a perspective view around the seat.
FIG. 8 is a side view of a seat belt pretensioner device to which the present invention is applied.
FIG. 9 is a bottom view of a seat belt pretensioner device to which the present invention is applied.
FIG. 10 is a cross-sectional view showing the structure of a power generation device according to the present invention.
FIG. 11 is a diagram for explaining the operating point of a seat belt pretensioner device to which the present invention is applied;
FIG. 12 is a view similar to FIG. 10 showing a modification of the power generation device according to the present invention.
13 is a view similar to FIG. 10 showing a modification of the power generating device according to the present invention.
14 is a side view similar to FIG. 2, showing the configuration of an occupant restraint device in a third embodiment to which the present invention is applied. FIG.
15 is a view similar to FIG. 4 or FIG. 10 showing the structure of a power generation device of a conventional seat belt pretensioner device.
[Explanation of symbols]
1 Vehicle seat
2 Seat rail
3 Seat frame
4 Sub-assembly of passenger restraint system
5 Casing
5a Body
5b Lid
5c Guide hole
5d support
5e Fastening part
6 Arm
6a color
6b long hole
7 Anti-slip member
8 Power generator
9 One-way lock mechanism
10 Sliding prevention member protrusion start load defining means
10a Engagement part
10b opening
10c Thin part
10d center opening
11 Piston member
11a Piston body
11b Piston rod
11c thread groove
12 pins
13 cylinders
13a Inner hole
13b Step
13c Working end opening
13d Thin part
14 Gas generator
14a Basic diameter measuring section
14b Tip side small diameter part
14c Step
15 Seal member
16 Compression coil spring
17 O-ring
18 Casing
18a Large diameter part
18b Taper part
18c engagement groove
19 Engagement piece
20 Spring
21 Center pillar
22 ELR equipment
23 Seat belt
24 Through ring
25 seats
26 end
27 tongue plate
28 buckle
28a Anchor part
P Pretensioner device
31 Base plate
32 arms
33 Actuator
34 Link members
34a C-shaped part
35 Checking device
36 Center shaft
37 Ankapin
38, 39 pins
41 Pretensioner device
42 buckle
43 Link member
44 Rotating arm
50 Power generator
51 cylinders
51a Inner hole
51b Reduced diameter part
52 piston
52a free end
52b Base end
53 O-ring
54 cap
54a opening
55 Gas generator
57 Presser plate

Claims (8)

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, the anti-slip member that is movably supported by the casing fixed to the seat frame so as to protrude upward, and the above-described protruding upward An occupant restraint device comprising: a lock mechanism for holding the anti-skid member in the protruding position; and a power generation device for driving the anti-skid member,
The power generation device includes a cylinder, a piston member that is received in the cylinder and protrudes from an opening at one end thereof and directly or indirectly engages with the anti-slip member, and the internal pressure of the cylinder is rapidly increased. possess a gas generating means which is received in the cylinder, and a spring for urging the piston member in the protruding direction in the said cylinder,
The occupant restraint device , wherein a tip end portion of the gas generating means enters a central through hole of the spring . A power generator for instantaneously driving a driven member,
A cylinder,
A piston member received in the cylinder and projecting from one end opening thereof to directly or indirectly engage the driven member;
Gas generating means received in the cylinder to rapidly increase the internal pressure of the cylinder;
A spring disposed between the piston member and the gas generating means to urge the piston member in a protruding direction within the cylinder;
The power generating device according to claim 1, wherein a distal end portion of the gas generating means enters a central through hole of the spring.   The distal end portion of the gas generating means enters the central through hole of the spring to such an extent that a gap is secured between the piston member and the distal end portion from which the gas of the gas generating means is ejected even when the spring is most contracted. The power generation device according to claim 2, wherein:   The said gas generation means has a base end side large diameter part and the front end side small diameter part from which gas ejects, The step part in between has comprised the spring seat of the said spring. Item 4. The power generation device according to Item 3.   5. The power generation device according to claim 4, wherein a step portion formed on the cylinder is engaged with a step portion of the gas generating means via an elastic seal member. A piston body having a size that the piston member does not protrude from the cylinder even when power is generated;
The base end includes a piston rod that is detachably engaged with the piston main body from the one end opening side of the cylinder, and the free end includes a piston rod that is directly or indirectly engaged with the driven member. The power generation device according to any one of claims 2 to 5.   The piston main body and the piston rod are engaged by contact at a central portion between a concave portion having a curved surface with a curvature toward the center of the axis and a convex portion having a curved surface with a slightly smaller curvature. The power generation device according to claim 6.   The piston main body and the piston rod have a tapered concave portion that gradually decreases in diameter toward the center of the axis, a convex portion that forms a curved surface, or a convex portion that forms a tapered shape that slightly reduces the diameter slightly than the taper. The power generation device according to claim 6, wherein the power generation device is engaged by contact at a center portion of the power generation device.

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