JP3857599B2 - Webbing take-up device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a webbing take-up device provided with a so-called pretensioner mechanism and a force limiter mechanism.
[0002]
[Prior art]
The webbing take-up device includes a take-up shaft as described in, for example, one embodiment of JP-A-10-67300, and the webbing is taken up on the take-up shaft.
[0003]
This webbing take-up device includes a so-called rack and pinion type pretensioner mechanism. The pretensioner mechanism includes a pinion, and the pinion is connected to the take-up shaft and always rotates integrally with the take-up shaft. A cylindrical cylinder is provided in the vicinity of the pinion, and gas is supplied to one side of the cylinder in the event of a vehicle emergency.
[0004]
A piston is movably provided in the cylinder, and a fitting portion is provided at one end of the piston. The fitting portion is substantially fitted to the inner surface of the cylinder, and in the event of an emergency of the vehicle, the piston receives the gas pressure from one side of the fitting portion and moves toward the other side in the cylinder. Further, a rack is provided on the other side of the piston, and when the piston is moved to the other side, the rack meshes with the pinion and rotates the pinion in the webbing take-up direction. As a result, the webbing is wound around the winding shaft, and loosening of the webbing is removed.
[0005]
The webbing take-up device further includes a force limiter mechanism. The force limiter mechanism is provided with, for example, an energy absorbing member, and when the occupant's load on the webbing exceeds a predetermined amount in the event of a vehicle emergency, the energy absorbing member is deformed to move in the webbing pull-out direction. The winding shaft is allowed to rotate. Thereby, the webbing is pulled out from the take-up shaft, and the load on the occupant due to the webbing is limited to a predetermined amount or less.
[0006]
Further, when the force limiter mechanism is operated, the take-up shaft is rotated in the webbing pull-out direction. Accordingly, the pinion is rotated in the webbing pull-out direction, and the piston is moved toward the one side in the cylinder. The
[0007]
Here, in this webbing take-up device, a gas vent hole is formed in the piston, and the gas vent hole communicates one side of the fitting portion with the other side. Thereby, when the force limiter mechanism is activated and the piston is moved toward the one side in the cylinder, the gas is discharged from one side of the fitting portion to the other side through the gas vent hole. Inhibition of movement of the piston to one side by the gas in the cylinder (one side of the fitting portion) is suppressed, and inhibition of withdrawal of the webbing from the winding shaft is suppressed.
[0008]
However, in such a webbing take-up device, if the gas vent hole is large, a large amount of gas is discharged from one side of the fitting portion to the other side through the gas vent hole when the pretensioner mechanism is activated. The problem is that the piston cannot be moved to the other side with high pressure.
[0009]
On the other hand, when the gas vent hole is small, when the force limiter mechanism is activated, the gas discharged from one side of the fitting portion to the other side through the gas vent hole is reduced, and the one side of the fitting portion is There is a problem that inhibition of gas movement to one side of the piston cannot be sufficiently suppressed.
[0010]
Furthermore, a webbing take-up device described in another embodiment of JP-A-10-67300 includes a packing, and the packing has a gas vent hole in a state of being fitted between the cylinder and the rack. Blocked.
[0011]
Here, the packing is in contact with the other side surface of the fitting portion. Therefore, when the piston is moved to the other side by the pretensioner mechanism, the packing is moved together with the piston so that the packing is degassed. The state in which the hole is closed is maintained, and the gas is suppressed from being discharged from one side of the fitting portion to the other side.
[0012]
Furthermore, the sliding resistance between the packing and the cylinder is made larger than the sliding resistance between the packing and the rack. Therefore, when the piston is moved to one side by the force limiter mechanism, The moving speed of the packing is made slower than the moving speed, and the gas vent hole is opened, whereby the gas is discharged from one side of the fitting portion to the other side.
[0013]
However, in such a webbing take-up device, the packing is made of rubber. For this reason, when the pretensioner mechanism is operated, there is a problem that the packing is deformed due to gas pressure or the like and the gas vent hole cannot be reliably closed.
[0014]
Furthermore, it is difficult to set the sliding resistance between the packing and the cylinder to be larger than the sliding resistance between the packing and the rack due to molding errors of the packing and the like. For this reason, when the force limiter mechanism is operated, there is also a problem that the moving speed of the packing cannot be made slower than the moving speed of the piston, and the gas vent hole cannot be opened reliably.
[0015]
[Problems to be solved by the invention]
In consideration of the above facts, the present invention provides a webbing take-up device that can satisfactorily remove the slack of the webbing when the pretensioner mechanism is actuated and can well limit the load on the passenger due to the webbing when the force limiter mechanism is actuated The purpose is to obtain.
[0016]
[Means for Solving the Problems]
The webbing take-up device according to claim 1 is provided with a take-up shaft for taking up the webbing, a tubular housing member, and a fitting member that is provided in the housing member and is substantially fitted to the inner surface of the housing member. A moving member provided with a portion, and by supplying gas to one side of the fitting portion in the housing member in the event of an emergency of the vehicle, the moving member is moved to the other side by the pressure of the gas, and A pretensioner mechanism for rotating the take-up shaft in a direction to take up the webbing, and the take-up shaft in a direction in which the webbing is pulled out when an occupant's load on the webbing exceeds a predetermined amount in a vehicle emergency. A force limiter mechanism that permits rotation and moves the moving member to one side, wherein the webbing take-up device is provided on the moving member and communicates one side and the other side of the fitting portion. Vent holes The gas vent hole is provided on the other side of the fitting portion, and when the moving member is moved to the other side by the pretensioner mechanism, the gas is moved together with the moving member to move the gas. The state in which the hole is closed is maintained, and when the moving member is moved to one side by the force limiter mechanism, the moving member side portion is pressed by the moving member. In addition, a frictional force is generated between the inner surface of the housing member. And a closing member that is rotated to open the gas vent hole.
[0017]
The webbing take-up device according to claim 1 is provided with a pretensioner mechanism, and moves by gas pressure by supplying gas into the housing member (one side of the fitting portion of the moving member) in the event of an emergency of the vehicle. The member is moved to the other side to rotate the winding shaft in the direction of winding the webbing. As a result, the webbing is wound around the winding shaft, and loosening of the webbing is removed.
[0018]
Further, the webbing take-up device according to claim 1 includes a force limiter mechanism, and when the load of the occupant on the webbing exceeds a predetermined amount in an emergency of the vehicle, the webbing take-up device is wound in the direction in which the webbing is pulled out. The rotation of the spindle is allowed. Thereby, the webbing is pulled out from the take-up shaft, and the load on the occupant due to the webbing is limited to a predetermined amount or less. At this time, the moving member is moved to one side by rotating the winding shaft in the direction of pulling out the webbing.
[0019]
By the way, the moving member is provided with a gas vent hole, and the gas vent hole communicates one side of the fitting portion with the other side. Further, a closing member is provided on the other side of the fitting portion, and the closing member closes the gas vent hole.
[0020]
Here, when the moving member is moved to the other side by the pretensioner mechanism, the state in which the closing member closes the gas vent hole is maintained by moving the closing member together with the moving member. Thereby, it can suppress that a lot of gas is discharged | emitted from the one side to the other side of a fitting part, a piston can be moved by a high pressure, and the loosening of a webbing can be removed favorably.
[0021]
Further, when the moving member is moved to one side by the force limiter mechanism, the closing member is pressed against the moving member side portion by the moving member to which the load of the occupant on the webbing is transmitted via the winding shaft. Thus, the closing member can be rotated to reliably open the gas vent hole. As a result, the amount of gas discharged from one side of the fitting portion to the other side increases, and inhibition of the movement of the piston by the gas on one side of the fitting portion can be sufficiently suppressed. The load can be limited well.
[0022]
Further, as described above, when the moving member is moved to one side by the force limiter mechanism, the closing member is rotated and the gas vent hole is opened. For example, the frictional force between the closing member and the inner surface of the housing member is increased. Thus, it is not always necessary to open the gas venting hole by making the moving speed of the closing member smaller than the moving speed of the moving member, thereby suppressing damage (such as damage) of the inner surface of the housing member by the closing member. Can be.
[0023]
The webbing take-up device according to claim 2 is the webbing take-up device according to claim 1, wherein Anti-above The moving member side portion is brought into contact with the inner surface of the housing member.
[0024]
In the webbing take-up device according to the second aspect, the portion of the closing member on the side opposite to the moving member is in contact with the inner surface of the housing member. For this reason, when the moving member is moved to the other side by the pretensioner mechanism and the closing member is moved together with the moving member, the closing member can be prevented from being displaced from between the moving member and the inner surface of the housing member. The state in which the closing member closes the vent hole can be maintained well.
[0025]
For this reason, when the moving member is moved to one side by the force limiter mechanism and the closing member is pressed against the moving member by the moving member, the closing member is reliably secured by the frictional force between the closing member and the inner surface of the housing member. The gas vent hole can be opened more reliably.
[0026]
In addition, when the closing member is made of metal or the like and has high rigidity, it is possible to suppress the deformation of the closing member due to gas pressure or the like when the pretensioner mechanism is operated. The hole can be reliably closed.
[0027]
The webbing take-up device according to claim 3 is the webbing take-up device according to claim 1 or 2, Apart from the closing member When the moving member is moved to the other side by the pretensioner mechanism, the gas venting hole is sealed, and the gas venting hole is sealed by being moved together with the moving member and the closing member. The sealing member is maintained, and when the moving member is moved to one side by the force limiter mechanism, the closing member opens the gas vent hole to release the gas vent hole from being sealed. It is characterized by that.
[0028]
In the webbing take-up device according to claim 3, when the moving member is moved to the other side by the pretensioner mechanism, the sealing member is moved together with the moving member and the closing member, so that the sealing member has the gas vent hole. A sealed state is maintained. Thereby, it can prevent that a lot of gas is discharged | emitted from the one side to the other side of a fitting part, and can remove the loosening of webbing still more favorably.
[0029]
Furthermore, when the moving member is moved to one side by the force limiter mechanism, the closing member opens the gas vent hole, thereby releasing the gas vent hole from being sealed by the sealing member. Thereby, the gas discharged | emitted from the one side to the other side can still be increased, and the load to the passenger | crew by webbing can be restrict | limited favorably.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 3 is a side view showing a schematic configuration of the webbing take-up device 10 according to the embodiment of the present invention.
[0031]
The webbing take-up device 10 includes a frame 12, and the frame 12 is fixed to the vehicle. A winding shaft 14 is rotatably supported on the frame 12, and a webbing 16 is wound on the winding shaft 14.
[0032]
The webbing take-up device 10 includes a rack and pinion type pretensioner mechanism 18, and a pinion 20 is connected to one end of the take-up shaft 14. The pinion 20 always rotates integrally with the take-up shaft 14, whereby the webbing 16 is taken up or pulled out.
[0033]
A base cartridge 22 as a housing member is fixed to the frame 12. The base cartridge 22 is formed in a cylindrical shape, and the upper end side (the other side) of the base cartridge 22 opens near the pinion 20 and the lower end side (one side) of the base cartridge 22 is closed.
[0034]
A gas supply hole 24 is formed at the lower end of the base cartridge 22, and the gas supply hole 24 penetrates the base cartridge 22. Further, a gas generating cylinder 26 is integrally formed at the lower end of the base cartridge 22, and the inside of one end of the gas generating cylinder 26 is communicated with the gas supply hole 24.
[0035]
A gas generating agent 28 such as MGG (micro gas generator) is accommodated in the gas generating cylinder 26, and the gas generating agent 28 is integrated with a closing lid 30 disposed outside the gas generating cylinder 26. It is said that. A bottomed cylindrical cap 32 is fixed to the other end of the gas generating cylinder 26, and a closing lid 30 is accommodated in the cap 32. The bottom wall of the cap 32 presses the closing lid 30 toward the gas generating cylinder 26, and the other end of the gas generating cylinder 26 is closed by the closing lid 30. Here, in the event of a vehicle emergency due to a collision or the like, the gas generated in the gas generation cylinder 26 by the gas generating agent 28 (for example, ignition of MGG) is supplied into the base cartridge 22 from the gas supply hole 24.
[0036]
A piston 34 as a moving member is provided in the base cartridge 22, and the piston 34 can move in the vertical direction in the base cartridge 22. A disc-shaped fitting portion 36 is formed near the lower end of the piston 34, and the fitting portion 36 is substantially fitted to the inner surface of the base cartridge 22. The gas supply hole 24 is disposed below the fitting portion 36. When gas is supplied into the base cartridge 22, the pressure of the gas causes the piston 34 to move in the direction indicated by the arrow A in FIG. ) To move up.
[0037]
The lower end of the piston 34 (a portion directly below the fitting portion 36) is cylindrical, and an O-ring 38 is fitted to the outer periphery of the lower end of the piston 34. The O-ring 38 has elasticity and is in close contact with the inner surface of the base cartridge 22, and the gas below the fitting portion 36 is located between the fitting portion 36 and the inner surface of the base cartridge 22 to the upper side of the fitting portion 36. The o-ring 38 prevents slipping out.
[0038]
A portion above the fitting portion 36 of the piston 34 is formed in a substantially quadrangular prism shape, and a rack 40 is formed on the rear side wall of the piston 34 from the upper end portion to the middle portion. The rack 40 corresponds to the pinion 20, and when the piston 34 moves in the direction of arrow A in FIG. 3, the rack 40 meshes with the pinion 20. As a result, the winding shaft 14 is rotated in the direction of arrow B in FIG. 3 (the direction in which the webbing 16 is wound) via the pinion 20, and the webbing 16 is wound around the winding shaft 14.
[0039]
Furthermore, the webbing take-up device 10 includes a force limiter mechanism (not shown), and the force limiter mechanism includes an energy absorbing member (not shown). When the occupant's load on the webbing 16 exceeds a predetermined amount in an emergency of the vehicle, the energy absorbing member is deformed by the occupant's load on the webbing 16, and the direction of the arrow D in FIG. Rotation of the winding shaft 14 in the direction) is permitted. As a result, the webbing 16 is pulled out from the winding shaft 14 and the piston 34 is moved (lowered) in the direction (one side) of the arrow C in FIG. 3 via the pinion 20 and the rack 40.
[0040]
As shown in FIGS. 5A and 5B, a rectangular parallelepiped fitting recess 42 is formed on the right side wall of the lower portion of the piston 34, and the lower surface of the fitting recess 42 is formed by the upper surface of the fitting portion 36. Has been.
[0041]
A gas vent hole 44 is formed in the lower portion of the piston 34. The gas vent hole 44 is L-shaped and has a vertical hole 46 and a horizontal hole 48. One end of the gas vent hole 44 (the right end of the horizontal hole 48) is opened in the fitting recess 42, and the other end of the gas vent hole 44 (the lower end of the vertical hole 46) is opened in the lower surface of the piston 34. The hole 44 communicates the upper side and the lower side of the fitting part 36. Thereby, the gas below the fitting portion 36 can be discharged to the upper side of the fitting portion 36 through the gas vent hole 44. Further, a spherical (or cylindrical) packing 50 (see FIG. 1) as a sealing member is fitted in the gas vent hole 44 in the vicinity of one end, and the packing 50 is made of rubber, for example, to be elastic. By having it, the vent hole 44 is sealed.
[0042]
An L-shaped gas discharge hole 52 is formed in the lower part of the piston 34, and one end of the gas discharge hole 52 is opened on the right side surface of the piston 34 above the fitting recess 42 and the other end of the gas discharge hole 52. Is communicated with the upper end of the vertical hole 46. Thus, the gas discharge hole 52 communicates the upper side and the lower side of the fitting part 36 via the vertical hole 46, and the gas below the fitting part 36 passes through the vertical hole 46 and the gas discharge hole 52. And discharged to the upper side of the fitting portion 36.
[0043]
As shown in FIG. 4, a metal retainer 54 (made of stainless steel in the present embodiment) as a closing member shown in detail in FIG. 6 is provided in the base cartridge 22, and the retainer 54 has a substantially rectangular shape. The plate-like material is bent into a substantially annular shape. The lower surface left portion of the retainer 54 is a horizontal plane, and the retainer 54 is placed on the fitting portion 36 with the lower surface left portion in surface contact with the fitting portion 36 of the piston 34 (see FIG. 1). . At the right end of the retainer 54, a curved projection 56 is formed on both the front and rear sides, and each curved projection 56 is in contact with the inner surface of the base cartridge 22.
[0044]
At the left end of the retainer 54, a rectangular insertion notch 58 is formed on both the front and rear sides of one end of the plate material, and an L-shaped insertion protrusion 60 is formed to protrude upward on both the front and rear sides of the other end of the plate material. In addition, the base end portion of each insertion protrusion 60 is inserted into each insertion notch 58. A rectangular fitting protrusion 62 is formed at the tip of each insertion protrusion 60, and each fitting protrusion 62 protrudes upward from the tip of each insertion protrusion 60.
[0045]
The left surface of the retainer 54 (one end of the plate-like material, the left surface of each insertion protrusion 60 and each fitting protrusion 62) is a vertical surface, and the retainer 54 is in surface contact with the fitting recess 42 of the piston 34 on the left surface. Yes. Further, the upper edge of each insertion protrusion 60 is brought into contact with the upper surface of the fitting recess 42 (see FIG. 1), and the portion directly above the fitting recess 42 of the piston 34 is disposed between each fitting protrusion 62. Yes. Accordingly, the retainer 54 closes one end opening of the gas vent hole 44 on the left surface.
[0046]
Here, as shown in FIG. 1, when the piston 34 is moved in the direction of arrow A by the pretensioner mechanism 18, the lower left portion of the retainer 54 is pressed by the fitting portion 36 of the piston 34, and the retainer 54 is moved. By moving together with the piston 34, the state in which the left surface of the retainer 54 closes one end opening of the gas vent hole 44 and the state in which the packing 50 seals the gas vent hole 44 are maintained.
[0047]
On the other hand, as shown in FIG. 2, when the piston 34 is moved in the direction of arrow C by the force limiter mechanism, the occupant's load on the webbing 16 is transmitted via the winding shaft 14 and the pinion 20. The upper edge (the piston 34 side portion) of each insertion projection 60 of the retainer 54 is pressed against the upper surface of the fitting recess 42, and the curved projections 56 (the portion opposite to the piston 34) of the retainer 54 and the inner surface of the base cartridge 22. When the frictional force is generated between them, the retainer 54 is rotated to open one end opening of the gas vent hole 44, and the packing 50 is fitted from the gas vent hole 44 by the gas pressure below the fitting portion 36. The gas is discharged toward the concavity 42 and the sealing of the gas vent hole 44 by the packing 50 is released.
[0048]
Next, the operation of the present embodiment will be described.
[0049]
The webbing take-up device 10 having the above-described configuration includes the pretensioner mechanism 18, and gas generated in the gas generating cylinder 26 by the gas generating agent 28 in an emergency of the vehicle from the gas supply hole 24 into the base cartridge 22 ( By supplying to the lower side of the fitting portion 36 of the piston 34, the piston 34 is moved upward (in the direction of arrow A in FIGS. 1 and 3) by the gas pressure, and the winding shaft 14 is moved via the pinion 20. Is rotated in the direction of winding the webbing 16 (the direction of arrow B in FIG. 3). As a result, the webbing 16 is wound around the winding shaft 14, and the looseness of the webbing 16 is removed.
[0050]
Further, the webbing take-up device 10 includes a force limiter mechanism, and when an occupant's load on the webbing 16 exceeds a predetermined amount in an emergency of the vehicle, an energy absorbing member is generated by the occupant's load on the webbing 16. Is deformed, the rotation of the winding shaft 14 in the direction in which the webbing 16 is pulled out (the direction of the arrow D in FIG. 3) is permitted. Thereby, the webbing 16 is pulled out from the winding shaft 14, and the load on the occupant by the webbing 16 is limited to a predetermined amount or less. At this time, the winding shaft 14 is rotated in the direction in which the webbing 16 is pulled out, so that the piston 34 is moved downward (in the direction of arrow C in FIGS. 1 and 3) via the pinion 20.
[0051]
Incidentally, the piston 34 is provided with a gas vent hole 44, and the gas vent hole 44 communicates the lower side and the upper side of the fitting portion 36. Further, a retainer 54 is provided above the fitting portion 36, and the retainer 54 closes the gas vent hole 44.
[0052]
Here, when the piston 34 is moved upward by the pretensioner mechanism 18, the retainer 54 is moved together with the piston 34, so that the state where the retainer 54 closes the gas vent hole 44 is maintained. Thereby, it is possible to prevent a large amount of gas from being discharged from the lower side to the upper side of the fitting portion 36, and it is possible to raise the piston 34 with a high pressure and to remove the looseness of the webbing 16 well. At this time, the gas on the lower side of the fitting portion 36 is discharged to the upper side of the fitting portion 36 through the vertical hole 46 and the gas discharge hole 52, thereby adjusting the pressure on the piston 34 and the lifting force of the piston 34. Has been.
[0053]
Further, when the piston 34 is moved upward by the pretensioner mechanism 18, the packing 50 is moved together with the piston 34 and the retainer 54, so that the state where the packing 50 seals the gas vent hole 44 is maintained. Thereby, it is possible to prevent a large amount of gas from being discharged from the lower side to the upper side of the fitting portion 36, and it is possible to remove the looseness of the webbing 16 more satisfactorily.
[0054]
Further, since each curved protrusion 56 of the retainer 54 is in contact with the inner surface of the base cartridge 22, when the piston 34 is moved upward by the pretensioner mechanism 18 and the retainer 54 is moved together with the piston 34, the retainer 54 is moved. It is possible to suppress deviation from between the fitting recess 42 of the piston 34 and the inner surface of the base cartridge 22. Thereby, the state which the retainer 54 obstruct | occluded the gas vent hole 44 can be maintained favorable.
[0055]
Furthermore, since the retainer 54 is made of metal and has high rigidity, it is possible to prevent the retainer 54 from being deformed by the gas pressure or the like when the pretensioner mechanism 18 is operated. The punch hole 44 can be reliably closed.
[0056]
On the other hand, when the piston 34 is moved downward by the force limiter mechanism, the retainer 54 is inserted into the fitting recess 42 of the piston 34 to which the passenger's load on the webbing 16 is transmitted via the take-up shaft 14 and the pinion 20. When the upper edge of each insertion protrusion 60 is pressed, the retainer 54 is rotated and the one end opening of the gas vent hole 44 can be reliably opened, and the packing 50 is degassed by the gas pressure below the fitting portion 36. The gas is discharged from the hole 44 and the sealing of the gas vent hole 44 by the packing 50 is released. As a result, the amount of gas discharged from the lower side to the upper side of the fitting portion 36 increases, so that the lowering of the piston 34 due to the lower gas of the fitting portion 36 can be sufficiently suppressed. The load on the passenger can be well limited.
[0057]
Moreover, since the gas below the fitting portion 36 is discharged to the upper side of the fitting portion 36 through the vertical hole 46 and the gas discharge hole 52, the gas discharged from the lower side to the upper side of the fitting portion 36 is reduced. It is possible to further increase the load on the occupant by the webbing 16 and to better limit the load.
[0058]
Further, since each curved projection 56 of the retainer 54 is in contact with the inner surface of the base cartridge 22, the piston 34 is moved downward by the force limiter mechanism, and the retainer 54 is pressed against the upper edge of each insertion projection 60 by the piston 34. At this time, the retainer 54 can be reliably rotated by the frictional force between the retainer 54 and the inner surface of the base cartridge 22, whereby the gas vent hole 44 can be more reliably opened.
[0059]
Further, as described above, when the piston 34 is moved downward by the force limiter mechanism, the retainer 54 opens the gas vent hole 44 so that the seal of the gas vent hole 44 by the packing 50 is released. As a result, even when the gas vent hole 44 is sealed by the packing 50 as in the present embodiment, it is possible to increase the amount of gas that is still discharged from the lower side to the upper side when the force limiter mechanism is operated. The load on the occupant due to 16 can be well limited.
[0060]
Further, as described above, when the piston 34 is moved downward by the force limiter mechanism, the retainer 54 is rotated and the gas vent hole 44 is opened. For example, the frictional force between the retainer 54 and the inner surface of the base cartridge 22 is increased. It is not always necessary to open the gas vent hole 44 by increasing the moving speed of the retainer 54 to be lower than the moving speed of the piston 34. As a result, the retainer 54 damages the inner surface of the base cartridge 22 (such as scratches). Can be suppressed.
[0061]
Moreover, since the retainer 54 is in contact with the inner surface of the base cartridge 22 at each curved projection 56, damage (such as damage) on the inner surface of the base cartridge 22 can be further suppressed.
[0062]
In this embodiment, the packing 50 (sealing member) is fitted in the gas vent hole 44. However, a sheet-like seal is formed between one end opening of the gas vent hole and the retainer (blocking member). It is good also as a structure which has arrange | positioned the member.
[0063]
【The invention's effect】
In the webbing take-up device according to claim 1, when the moving member is moved to the other side by the pretensioner mechanism, the closing member is moved together with the moving member so that the closing member closes the gas vent hole. Therefore, the looseness of the webbing can be favorably removed by moving the piston with a high pressure.
[0064]
Further, when the moving member is moved to one side by the force limiter mechanism, the obstruction member can be rotated to reliably open the gas vent hole, so that inhibition of the movement of the piston by the gas can be sufficiently suppressed. The load on the passenger due to the webbing can be well limited. For this reason, for example, it is not always necessary to increase the frictional force between the closing member and the inner surface of the housing member, and damage to the inner surface of the housing member due to the closing member can be suppressed.
[0065]
In the webbing take-up device according to claim 2, since the portion of the closing member on the side opposite to the moving member is in contact with the inner surface of the housing member, the moving member is moved to the other side by the pretensioner mechanism, and the closing member is moved to the moving member. When moving together, the blocking member can be prevented from shifting between the moving member and the inner surface of the housing member, and the state in which the blocking member blocks the gas vent hole can be maintained well.
[0066]
For this reason, when the moving member is moved to one side by the force limiter mechanism and the closing member is pressed against the moving member by the moving member, the closing member is reliably secured by the frictional force between the closing member and the inner surface of the housing member. It can be rotated and the vent hole can be opened more reliably.
[0067]
Further, when the rigidity of the closing member is increased, the deformation of the closing member when the pretensioner mechanism is actuated can be suppressed, and the gas vent hole can be reliably closed.
[0068]
In the webbing take-up device according to claim 3, when the moving member is moved to the other side by the pretensioner mechanism, the state in which the sealing member seals the gas vent hole is maintained, so that the webbing is further loosened. Can be removed.
[0069]
Further, when the moving member is moved to one side by the force limiter mechanism, the sealing of the gas vent hole by the sealing member is released, so that the load on the occupant by the webbing can still be satisfactorily limited.
[Brief description of the drawings]
FIG. 1 is a side view seen from the rear side showing the inside of a base cartridge when a piston is raised by a pretensioner mechanism in a webbing take-up device according to an embodiment of the present invention.
FIG. 2 is a rear side view showing the inside of the base cartridge when the piston is lowered by the force limiter mechanism in the webbing take-up device according to the embodiment of the present invention.
FIG. 3 is a side view seen from the left side showing a schematic configuration of the webbing take-up device according to the embodiment of the present invention.
FIG. 4 is a plan view showing the inside of the base cartridge in the webbing take-up device according to the embodiment of the present invention.
5A and 5B are views showing a piston in the webbing retractor according to the embodiment of the present invention, wherein FIG. 5A is a side view seen from the rear side, and FIG. 5B is a side view seen from the right side. .
FIG. 6 is a perspective view showing a retainer in the webbing take-up device according to the embodiment of the present invention.
[Explanation of symbols]
10 Webbing take-up device
14 Winding shaft
16 Webbing
18 Pretensioner mechanism
22 Base cartridge (housing member)
34 Piston (moving member)
36 Fitting part
44 Gas vent hole
50 Packing (sealing member)
54 Retainer (blocking member)

Claims (3)

A winding shaft for winding the webbing;
A housing member formed in a cylindrical shape and a moving member provided in the housing member and provided with a fitting portion that is substantially fitted to an inner surface of the housing member; A pretensioner mechanism that rotates the take-up shaft in a direction to take up the webbing by moving the moving member to the other side by the pressure of the gas by supplying it to the one side of the fitting portion,
A force limiter mechanism for permitting rotation of the take-up shaft in a direction to pull out the webbing and moving the moving member to one side when an occupant's load on the webbing exceeds a predetermined amount in an emergency of a vehicle; ,
A webbing take-up device comprising:
A degassing hole provided in the moving member and communicating between one side and the other side of the fitting portion;
The degassing hole is provided on the other side of the fitting portion in a closed state, and when the moving member is moved to the other side by the pretensioner mechanism, the degassing is performed by moving with the moving member. When the state in which the hole is closed is maintained and the moving member is moved to one side by the force limiter mechanism, the moving member is pressed against the moving member side portion and between the inner surface of the containing member. A closing member that is rotated by the generation of frictional force to open the vent hole;
A webbing take-up device comprising: The webbing take-up device according to claim 1, wherein the moving member side portion of the closing member is in contact with the inner surface of the housing member. The gas vent hole is sealed and provided separately from the closing member, and when the moving member is moved to the other side by the pretensioner mechanism, the gas releasing hole is moved together with the moving member and the closing member. The state in which the hole is sealed is maintained, and when the moving member is moved to one side by the force limiter mechanism, the sealing member releases the gas vent hole to release the seal of the gas vent hole. The webbing take-up device according to claim 1 or 2, further comprising a sealing member.

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