JP4248106B2 - Seat belt device - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a seat belt device for a vehicle or the like, and more particularly to a retractor that automatically winds up an extra webbing (seat belt), and forcibly rotates a webbing take-up shaft when the vehicle suddenly decelerates. The present invention relates to an improvement in a seat belt device that takes up slack of webbing and temporarily restrains an occupant to a seat to further enhance safety.
[0002]
[Prior art]
Conventionally, various types of retractor pretensioners are known from the viewpoint of the principle of the emergency winding structure for webbing. For example, as a method of extruding a spherical rolling element by gas pressure or the like, JP-A-56-23972, German Patent Publication “DE 195 12 660 A1”, German Patent Publication “DE 196 02 549 A1”, U.S. Pat. No. 5,690,295 and JP-A-56-23972 are known.
[0003]
In the pretensioner equipped with these rolling elements, a plurality of rolling elements are pumped through a pipe with high-pressure gas at the time of a vehicle collision, and the rolling elements are sequentially engaged with a drive gear attached around a retractor shaft. It has a structure in which the retractor shaft is rotated in the winding direction and the seat belt is rapidly wound.
[0004]
Usually, an effort is made to secure a stroke for moving a sufficiently long rolling element by twisting a pipe serving as a moving path of the rolling element or bending it in a spiral shape.
[0005]
[Problems to be solved by the invention]
However, by providing the rolling element passage and the like, the volume of the entire pretensioner is increased and complicated, and the size of the retractor is inevitable.
[0006]
Therefore, an object of the present invention is to make the pretensioner smaller and simpler and facilitate vehicle mounting.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a seat belt device of the present invention includes a housing including a pressure chamber and first and second moving body passages communicating with the pressure chamber, and a high pressure in the pressure chamber provided in the housing. A pressure applying device that generates gas; a moving body disposed in the first moving body passage; and an extruding member that receives the pressure of the high-pressure gas and moves the moving body in the first moving body passage. When the outer periphery of the webbing is attached to the winding shaft and rotates in the winding direction, one end is attached to the outer periphery of the clutch connected to the winding shaft, and the other end is wound around the clutch. A tension medium attached to the housing through engagement with a moving body, wherein the pressure chamber and the first moving body passage are formed by a first pipe having a circular cross section and a second pipe having a square cross section, respectively. To be, Prete With a retractor, including the tensioner mechanism.
[0008]
With this configuration, a required rotation amount of the winding shaft can be obtained by a short moving distance of the moving body, and the length and depth dimension of the first pipe (cylinder) can be reduced.
[0009]
Preferably, the movable body is a rollable cylindrical (column) roller. Thereby, the rolling element can move along the linear and circular moving body passages.
[0010]
The seat belt device of the present invention includes a pressure chamber, a moving body passage integrally communicating with the pressure chamber and containing a moving body therein, a pressure applying device for generating high-pressure gas in the pressure chamber, and the moving When the movable body arranged in the body passage and the movable body in the movable body passage are moved under the pressure of the high-pressure gas, the clutch mounted on the webbing take-up shaft is actuated to wind the webbing. A seat belt device including a retractor including a pretensioner mechanism including a tensioner mechanism, wherein the pressure chamber and the moving body passage are formed by a substantially L-shaped pipe, and the pipe is downwardly formed in an L-shaped corner portion. It has a constricted constricted part. By providing the constriction at the L-shaped corner, the stroke of the moving body is made larger than when the constriction is not provided.
Preferably, the first pipe and the second pipe are communicated with each other via a constricted portion, and the constricted portion causes the second pipe to increase the stroke of the moving body. In addition, the constricted portion enables the central axis of the first pipe to be positioned closer to the winding shaft than the inner diameter center of the constricted portion. As a result, the mounting position of the pressure generating portion can be moved closer to the winding shaft, and the outer shape of the pretensioner can be reduced.
[0011]
Preferably, the first pipe and the second pipe are integrally formed.
[0012]
Preferably, the second pipe is formed linearly or curved.
[0013]
Preferably, the pressure applying device is inserted into the inlet of the first pipe, and the pressure applying device is fixed by caulking the pipe inlet.
[0014]
Preferably, the pushing member is positioned by a protrusion formed on the inner wall of the second pipe.
[0015]
Preferably, an entrance / exit of a rolling element is provided on the upper side surface of the second pipe, and attachment means (for example, a bolt hole or an engagement structure) for attaching the pipe to the housing is formed at the upper end of the pipe.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a seat belt device provided with a retractor including a pretensioner according to an embodiment of the present invention will be described with reference to the drawings. Note that, in each drawing, the same or corresponding parts are denoted by the same reference numerals, and redundant description of such parts is omitted.
[0017]
FIG. 1 is an explanatory view showing a state in which a retractor for a seat belt apparatus according to an embodiment is viewed from the side surface in the axial direction, and is shown in a partial sectional view in the II direction of the pretensioner 12 shown in FIG. ing. FIG. 2 is a cross-sectional view of the retractor 10 shown in FIG. 1 in the II-II direction of the pretensioner 12. FIG. 3 is an explanatory diagram illustrating the configuration of the clutch 44 of the pretensioner unit. 4 and 5 are explanatory diagrams for explaining the operation of the clutch 44. 6 to 11 are explanatory views for explaining the pipe 60 constituting the pressure chamber 30 and the moving body passage (cylinder) 38a.
[0018]
As shown in FIGS. 1 and 2, a retractor 10 of a seatbelt device according to an embodiment includes a plate-like retractor base 16 for mounting on a vehicle body, and a webbing (not shown) fixed on the retractor base 16. 1), an emergency lock mechanism 14 provided at one end of the retractor main body 13 in the axial direction, a pretensioner 12 and a take-up spring device 11 sequentially provided at the other end.
[0019]
The retractor body 13 includes a take-up reel 22 that can freely wind or pull out the webbing. The take-up reel 22 is always urged in the direction in which the webbing is taken up by the take-up spring device 11 connected to the retractor shaft 24 that is the take-up shaft. Furthermore, when the webbing is to be pulled out at an acceleration of a predetermined value or more, the emergency lock mechanism 14 connected to one end of the retractor shaft 24 in the axial direction is operated, the rotation of the retractor shaft 24 is prevented, and the webbing is pulled out. It is configured not to be.
[0020]
The take-up reel 22 portion of the retractor shaft 24 is a torsion shaft 24a. For example, as shown in Japanese Patent Application Laid-Open No. 46-7710, when an excessive force is applied, the torsion shaft 24a is twisted and the member is The retractor shaft 24 can be rotated in the webbing pull-out direction by plastic deformation. Thereby, the withdrawal of the webbing in an emergency is freed.
[0021]
The pretensioner 12 is formed in the housing 26 of the retractor 10. The pretensioner 12 has a function of forcibly winding the webbing and instantly eliminating the slack of the webbing when sudden deceleration occurs, such as at the time of a vehicle collision. Hereinafter, a configuration for realizing this function will be described.
[0022]
The pretensioner 12 generally includes a retractor shaft 24 connected to a webbing take-up reel 22, a clutch 44 attached to the retractor shaft 24 and connected to the retractor shaft 24 when rotating in the webbing take-up direction. A tension medium 40 wound around the outer periphery, a moving body 36 that engages with the tension medium 40, a moving body passage 38 that crosses the pulling medium 40 and guides the moving body 36, a pressure application device 32 that moves the moving body 36, and the like. Composed. The moving body passage 38 includes a linear passage (cylinder) 38 a and a circulation passage 38 b that circulates around the shaft 24. The space of the housing that accommodates the clutch 44, the tension medium 40, and the moving body passage 38 b is sealed by the lid body 28.
[0023]
As shown in FIG. 2, the retractor shaft 24 for winding the webbing is located substantially in the center of the housing, and a clutch device 44 is provided. The clutch device 44 operates when the outer periphery thereof rotates counterclockwise in the state shown in the drawing, is connected to the retractor shaft 24, and transmits the rotation of the outer periphery of the clutch to the retractor shaft 24. In other cases, that is, with respect to the clockwise rotation of the outer periphery of the clutch and the rotation of the retractor shaft 24, the clutch device 44 does not operate, and no force is transmitted between the clutch device 44 and the retractor shaft 24. .
[0024]
As shown in FIG. 3, the clutch device 44 includes a sleeve 44a, a plate 44b, and a pulley 44c.
[0025]
A plurality of projections (claws) 44bb bent in the axial direction are formed on the plate 44b, and holes 44ba are formed at the roots of the projections 44bb of the plate 44b so that the projections 44bb are easily deformed. The cross-sectional area of the bent projection (claw) 44bb of the plate 44b is a quadrangle in the illustrated example, but various shapes such as a circle, an ellipse, and a bow (arc) shape can be appropriately selected.
[0026]
As shown in FIGS. 1 and 2, the sleeve 44 a is attached to the right end side of the retractor shaft 24 and is also connected to the reel 22. On the surface of the sleeve 44a facing the pulley 44c, a large number of groove ridges (knurls) that circulate around the shaft (retractor shaft 24) are formed in the axial direction.
[0027]
Pulling medium 40 is attached to the outer peripheral surface of pulley 44c, and a cam surface is formed on the inner peripheral surface. This cam surface is opposed to the groove portion of the sleeve 44a through the protrusion 44bb of the plate 44b. The plate 44b is held by an inertial body, a frictional holding member, a shearing pin, or the like so that the pulley 44c rotates with a delay after the pulley 44c rotates and a deviation (phase difference) occurs. For example, the pulley 44c sandwiches the plate 44b between its side surface and the housing 26, and generates an appropriate frictional force that causes a phase difference.
[0028]
4 and 5 are explanatory diagrams for explaining the operation of the clutch device 44. In the state shown in FIG. 4, when the pulley 44c rotates relative to the plate 44b, the projection 44bb is bent toward the axial center by the cam surface of the pulley 44c and abuts against the groove of the sleeve 44a. Then, as shown in FIG. 5, the projection 44bb is interposed between the inner surface of the pulley 44c and the groove 44 of the sleeve 44a, and the rotation of the pulley 44c in the counterclockwise direction is retracted through the projection 44bb and the sleeve 44a. It is transmitted to the shaft 24. Thereby, the webbing can be wound.
[0029]
The outer diameter of the pulley 44 c of the clutch device 44 is smaller than the outer diameter of the reel 22. A tension medium 40 as a speed increasing mechanism is wound around the outer peripheral surface of the clutch 44 (pulley 44c) a plurality of times. The tension medium 40 is a linear body or a belt-like body, and is formed of a metal material having a predetermined width and length, such as a wire, a rope, or steel. One end of the tension medium 40 is fixed by a hook, a screw, spot welding or the like (not shown) provided on the outer peripheral surface of the clutch. After the tension medium 40 is wound, for example, twice in the counterclockwise direction, the other end of the locking member 46 is inserted into the locking member accommodation space 26 a of the housing 26 and locked.
[0030]
The outer circumference of the clutch device 44 and the inner circumference of the housing 26 form a circulation passage 38b of the moving body. In the example shown in the drawing, the circulation passage 38b is formed from the approximately 3 o'clock position around the retractor shaft 24 to the 6 o'clock position in the counterclockwise direction. However, a spiral groove is provided on the inner periphery of the housing 26. A moving body passage that circulates may be formed.
[0031]
As shown in FIG. 2, the housing 26 on the lower right side of the retractor shaft 24 is provided with a moving body passage 38a extending in the vertical direction and communicating with the circulation passage 38b. The moving body passage 38 a is formed by the pipe 64. The linear passage 38 a and the circular passage 38 b constitute a moving body passage 38. As will be described later, the passage 38a is not limited to a straight line (see FIG. 10).
[0032]
An elastic push member 42 is inserted in the lower part of the pipe 64, and a plurality of rolling elements 36 are inserted in a row in the upper part. As will be described later, the pipe 64 and the pushing member 42 function as a cylinder and a piston for pushing the rolling element 36 to the peripheral circuit 38b. The push-out member 42 has an outer diameter that is slightly larger than the inner diameter of the straight path (cylinder) portion 38a before assembly so that the elastic member is in close contact with the inner wall of the pipe to prevent gas leakage.
[0033]
As described above, a plurality of cylindrical rolling elements 36 are inserted into one row in a state where they are in contact with each other and can freely roll in the passage 38a of the moving body. The heads of the plurality of rolling elements 36 are located between the inner wall surface of the housing 26 and the clutch 44 as shown in FIG. The tension medium 40 wound around the clutch 44 makes a half turn in contact with the side surface of the leading rolling element 36, passes between the rolling element 36 and the inner wall surface of the housing 26, and holds the engaging member accommodating space 26 a of the housing 26. The engaging member 46 at the end of the pulling medium 40 is put into and engaged. Preferably, the leading rolling element 36 is formed with an engagement groove with the tension medium 40 that goes around the central portion of the outer periphery.
[0034]
The bottom portion of the pipe 64 communicates with the pipe 62 extending in the lateral direction to the lower portion of the retractor shaft 24 through the constricted portion 66. An L-shaped pipe 60 is integrally formed by the pipe 62 and the pipe 64.
[0035]
Inside the pipe 62 is a pressure chamber 30. The pressure application device 32 is attached to the pipe 62 by inserting the pressure application device 32 into the opening of the pipe 62 and caulking the pipe end 68.
[0036]
The pressure application device 32 is, for example, a horizontal type pressurized gas generator, and this pressurized gas generator includes an electrode, an ignition device, and a high-pressure gas generating agent. An ignition signal transmission harness for transmitting a signal from a shock sensor (not shown) for detecting a rapid acceleration generated at the time of a vehicle collision is connected to the electrode. When an ignition signal is transmitted from the shock sensor to the electrode, the ignition device ignites the high-pressure gas generating agent to instantly generate high-pressure gas.
[0037]
As shown in FIGS. 6 and 7, in the L-shaped pipe 60, the portion of the pipe 62 where the pressure application device 32 is mounted is circular in cross section, and the cylinder portion of the pipe 64 is square in cross section. The rolling element 36 uses, for example, a cylindrical roller whose diameter is sufficiently larger than the thickness (height).
[0038]
As shown in FIG. 8, the cylinder portion is not cross-sectionally circular but rectangular in cross-section, so that the same gas pressure density is applied to the piston (pushing member 42) in the width direction of the retractor 13 (retractor shaft 24). The dimension h in the axial direction) can be further reduced, which can contribute to downsizing of the retractor 13.
[0039]
As shown in FIG. 9, the constricted portion 66 is formed in the L-shaped pipe 60, and the upper constricted portion 66a is formed in the lower portion, whereby the cylinder length L is compared with the cylinder length l in the case where the constricted portion 66 is not provided. The cylinder length becomes L> l, and the stroke length of the cylinder portion can be secured longer. As a result, the distance in which the pressure is held by the push-up member 42 is increased, and the moving distance of the moving body is increased, which is good.
[0040]
Further, by lifting the central axis A of the pipe 62 above the center B of the inner diameter of the constricted portion 66 via the constricted portion 66b on the lower side of the constricted portion 66, the mounting center position of the gas generator 32 is moved upward. It is possible to move by Δh. Thereby, the position of the gas generating device 32 can be brought closer to the retractor shaft 24 side, which can contribute to downsizing of the device.
[0041]
When a strong pressure is applied to the rolling element 36 at the lower end of the rolling element row via the pushing portion 42 by the gas generator 32, the pressure is transmitted to the opposite rolling element 36, and the plurality of rolling elements 36 are transferred to the entire row. As a unit, it can move in the moving body passage 38a. When the row of the rolling elements 36 moves and moves from the moving body passage 38a to the circulating passage 38b, the leading rolling body 36 pushes the pulling medium 40, and the outer periphery of the clutch 44 and the inner periphery of the housing 26 Orbits the circumferential path of the circular passage 38b formed by the above. That is, if necessary, a circumferential groove is formed on the inner surface of the housing 26 so as to communicate with the moving body passage 38a and between the outer peripheral portion of the clutch device 44, and the rolling element 36 has the circumferential groove. Go around.
[0042]
FIG. 10 shows another configuration example of the pipe 60. In this example, the cross-sectional shape of the pipe 62 is circular and the cross-sectional shape of the pipe 64 is quadrangular, as in the pipe example of FIG. However, unlike the case of the pipe (cylinder) 64 in FIG. 7, the way in which the pipe extends is not linear but curved. Even if such a cylinder is curved or arcuate, it is possible to push the rolling element 40 into the circulating passage 38b of the moving body, and the same effect as the pretensioner shown in FIG. 2 can be expected. is there.
[0043]
FIG. 11 shows an example of the protrusion 60 a that determines the initial position of the pushing member 42. The protrusion 60a is formed on the inner wall of the pipe 64, and is constituted by one or a plurality of protrusions 60a or a protrusion that goes around the inner wall. The protrusion 60a is formed by, for example, extruding or punching the side surface of the pipe 64. It can also be formed by screw or rivet attachment, welding of a protruding piece, or the like. The pushing member 42 is locked on the upper side of the projection 60a, so that the pushing member 42 is positioned and the rolling element 36 is prevented from dropping. In addition, since the extrusion member 42 adheres to the inner wall of the pipe 60 by its own elasticity, the protrusion 60a may not be used.
[0044]
Next, the operation of this embodiment will be described. First, in an initial state in which an occupant gets on a vehicle, sits down, and wears a webbing, the pretensioner 12 is in an initial (non-operating) state shown in FIG. In this initial state, as shown in FIG. 4, the projection 44bb of the plate 44b and the sleeve 44a are separated from each other, so that the clutch device 44 is not involved in the operation of the pretensioner 12. Therefore, when the webbing pulled out from the take-up reel 22 is loosened, the retractor shaft 24 is rotated in the take-up direction by the take-up spring device 11, and the extra webbing is taken up.
[0045]
In such an initial state, when a sudden speed reduction occurs during a collision or the like in the vehicle, an ignition signal is supplied to the pressure application device 32 from a shock sensor (not shown). The pressure application device 32 instantaneously generates a pressurized gas, and this pressurized gas is released into the pressure chamber 30. As a result, the pressure chamber 30 becomes a high pressure, and a sudden pressing force is applied to the pushing member 42 positioned by the plurality of protrusions 60a from below, and the entire rolling element row is pushed out from the moving passage 38a instantaneously. It is.
[0046]
This pushing force is superior to the force of the tension medium 40 holding the rolling element row in the initial state. The head of the rolling element row engages with a portion where the pulling medium 40 traverses the moving passage 38b and moves to the circulating passage 38b while pushing the portion. In other words, the rolling element row performs a circular motion that moves in the circular passage 38b formed along the circular orbit.
[0047]
At this time, one end of the tension medium 40 is fixed to the outer periphery of the pulley 44c of the clutch 44, and is wound around the pulley 44c at least once, and the other end is locked to the inner wall of the accommodation space 26a. Yes. For this reason, the tension medium 40 strongly pressed by the roller train that has shifted to the circular motion is pulled out from the pulley 44c, and the pulley 44c rotates by this pulling out. According to the so-called “dynamic pulley principle”, the tension medium 40 wound around the outside of the clutch is drawn out by a length twice the moving distance of the rolling element row. As a result, the pulley 44c of the clutch 44 rotates by an angle corresponding to the pulling amount of the pulling medium 40. In other words, the tension medium 40 exhibits a double speed increasing action, and rotates the pulley 44c, which is the outer periphery of the clutch, in the direction of the arrow in FIG.
[0048]
Thereby, the pulley 44c and the plate 44b are displaced, and the plurality of cam surfaces on the inner periphery of the pulley 44c deform the plurality of projections 44bb of the plate 44b, respectively, and push the projections 44bb in the axial direction. The protrusion 44bb is engaged with the groove portion of the sleeve 44a, and the clutch device 44 is connected (see FIG. 5). The speed increasing mechanism represented by the tension medium 40 (that is, the pretensioner 12) and the retractor shaft 24 are coupled, and the retractor shaft 24 rotates in the direction of arrow A together with the rotation of the clutch device 44.
[0049]
As the rotational movement of the rolling element row proceeds, the amount of pulling by the tension medium 40 increases, and the rotation of the retractor shaft 24 proceeds at a stretch. By the rotational torque of the retractor shaft 24, the webbing take-up reel 22 to which the retractor shaft 24 is connected is forcibly rotated, and the webbing is taken up within a very short time. As a result, the webbing is tightened, the occupant is forcibly restrained by the seat, and the occupant is safe.
[0050]
12 and 13 show another embodiment of the present invention. FIG. 12 is a cross-sectional view of another pretensioner example shown in correspondence with FIG. 2. In FIG. 12, parts corresponding to those in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted. FIG. 13 is a perspective view illustrating an example of an L-shaped pipe 60 used in the pretensioner of FIG.
[0051]
In the pretensioner shown in FIG. 12, an L-shaped pipe 60 is attached to the housing 26 at an angle. A screw hole 67 is provided at the tip of the pipe 60, and the pipe 60 is attached to the housing with a mounting bolt or the like. Openings 69a and 69b are formed on both sides of the upper side surface of the pipe 64 having a square cross section of the pipe 60 (see FIG. 13). Among these, the opening 69a on the retractor shaft 24 side is an entrance / exit of the rolling element. The rolling elements 36 at the distal ends of the plurality of rolling elements 36 disposed in the rolling element passages 38 a formed by the pipes 64 are positioned in the substantially opening 69. The tension medium 40 wound around the outer periphery of the clutch 44 passes through the opening 69a, wraps around the rolling element 36 at the tip, passes through the pipe 64 from the right opening 69b of the pipe 64, and enters the housing 26 on the right side of the pipe. It enters into the formed locking member accommodation space 26a. The locking member 46 at the tip of the pulling medium 40 is locked in the locking member accommodation space 26a.
[0052]
According to this embodiment, the pipe 60 that needs to maintain pressure is fixed to the housing 26 with a bolt or the like. The L-shaped pipe to which the high pressure is applied can be fixed more reliably.
[0053]
As described above, according to the pretensioner according to the embodiment of the present invention, a moving body (a row of rolling elements 36 or a single moving body (for example, see Japanese Patent Application No. 10-354940), a tension medium 40, Since the unique structure of combining the speed increasing mechanism based on the “moving pulley” principle centered on the moving body passage 38b, the clutch 44 having a smaller diameter than the reel 22, etc. is adopted, the moving amount of the moving body 36 is increased. Correspondingly, the stroke of the cylinder 38a for accommodating the moving body can be reduced. In addition, by making the cross-sectional shape of the cylinder 38a a quadrangle, the dimension of the cylinder 38a in the retractor shaft direction can be shortened. Accordingly, the length and the depth of the cylinder 38a are relatively short, the entire pretensioner is downsized, and the on-vehicle conditions are eased. In addition, since the cylinder is formed by a pipe and the sealing property of the extruding member is good, the processing process of the moving body passage is simplified, thereby making it possible to reduce the manufacturing cost.
[0054]
Further, by inserting the gas generator 32 into a pipe having a circular cross section, the gas sealing performance is improved. By making the pipe portion into which the gas generator 32 is inserted into a circular cross section, the gas generator 32 can be easily crimped and fixed.
[0055]
Further, by adopting a structure in which rolling elements come in and out from the side surface 69a of the pipe 60, the pipe tip can be used as a pipe fixing (attaching) part. The mounting portion can be formed with a bolt hole or a hook that fits into the housing.
[0056]
It should be noted that the components of the above-described embodiment can be modified to have the same effect, or the components can be added / deleted, but such modified examples are equivalent to the scope of the present invention. .
[0057]
【The invention's effect】
As described above, the seatbelt device including the pretensioner according to the present invention includes a speed increasing mechanism, shortens the stroke of the pushing member 42, and reduces the cylinder (pipe) size by making the cylinder cross section square. Therefore, the pretensioner can be easily downsized and simplified.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of a retractor device 10 of a seat belt device as viewed from the outside in the axial direction of a retractor shaft 24. FIG.
FIG. 2 is a cross-sectional view illustrating a pretensioner 12 provided in the retractor device.
FIG. 3 is an exploded perspective view illustrating a clutch 44 used in a pretensioner.
4 is an explanatory diagram illustrating an initial (non-operating) state of a clutch 44. FIG.
FIG. 5 is an explanatory diagram for explaining a connection (operation) state of a clutch 44;
6 is a perspective view illustrating a pipe 60. FIG.
7 is a cross-sectional view illustrating a pipe 60. FIG.
FIG. 8 is an explanatory diagram for explaining a difference in dimensions when a cylindrical pipe and a square pipe are used.
FIG. 9 is an explanatory diagram for explaining the effect of the constriction 66 of the pipe 60;
FIG. 10 is an explanatory diagram for explaining another example of the pipe 60;
FIG. 11 is an explanatory view for explaining a protrusion 60a for locking the push-up member 42 in the pipe 64. FIG.
FIG. 12 is a cross-sectional view illustrating an example of another pretensioner.
FIG. 13 is a perspective view illustrating an example of a pipe 60 having openings 69a and 69b on the side surfaces and a bolt hole 67 on the tip.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Retractor 12 Pretensioner 24 Retractor shaft 26 Housing 28 Cover body 32 Pressurized gas generator (pressure application apparatus)
36 Rolling body 38 Moving body passage 38a Moving body passage (cylinder part)
38b Moving body passage (circumferential circuit section)
40 Pulling medium 42 Extruding member 44 Clutch device

Claims (3)

A housing including a pressure chamber and first and second movable body passages communicating with the pressure chamber;
A pressure applying device that is provided in the housing and generates high-pressure gas in the pressure chamber;
A cylindrical moving body disposed in the first moving body passage;
An extruding member that receives the pressure of the high-pressure gas and moves the moving body in the first moving body passage;
A clutch connected to the take-up shaft when attached to the take-up shaft of the webbing and the outer periphery rotates in the take-up direction;
A tension medium attached at one end to the outer periphery of the clutch and wound around the clutch, and the other end attached to the housing through engagement with the movable body;
The pressure chamber and the first moving body passage are each a sheet having a retractor including a pretensioner mechanism, which is integrally formed by a first pipe having a circular cross section and a second pipe having a square cross section corresponding to the moving body. Belt device.   2. The retractor including the pretensioner mechanism according to claim 1, wherein the integrally formed first and second pipes have a substantially L shape and have a constricted portion constricted downward at the L-shaped corner portion. Seat belt device. A seat belt apparatus including a retractor including a pretensioner mechanism ,
A retractor main body including a reel for winding the webbing, and a winding shaft of the reel ;
A pretensioner mechanism that generates a rotational force for forcibly winding the webbing ;
A clutch portion interposed between the winding shaft and the pretensioner mechanism and transmitting the generated rotational force in one direction from the pretensioner mechanism to the winding shaft ;
The pretensioner mechanism is
A pressure chamber, and a moving body passage integrally communicating with the pressure chamber and containing a moving body therein;
A pressure applying device for generating high-pressure gas in the pressure chamber;
One end is wound around the pulley of the clutch, and the other end is in contact with the moving body that moves under the pressure of the high-pressure gas, and is locked to the housing, thereby converting the movement of the moving body into the rotational force. A medium, and
The moving body passage and said pressure chamber is formed by a substantially L-shaped pipe, the pipe will have a constriction constricted downward in an L-corner part, the movable body to a position above the said constricted portion A seat belt apparatus comprising a retractor including a pretensioner mechanism disposed .

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