Pretensioner device

Abstract

To excellently adjust the size of a gap between an adjusting member and a communicating member.SOLUTION: In the lap pretensioner device, the packing 40 is housed in the housing hole 30D of the gas generator 34, the wire 18 is passed through the housing hole 30D and the packing 40, and the guard pipe 44 presses the packing 40 to adjust the size of the gap 42 between the packing 40 and the wire 18. Here, the axial size T of the housing hole 30D is larger than the axial size S of the packing 40. Therefore, when the guard pipe 44 presses the packing 40, it is possible to prevent the packing 40 from being deformed and expanded to the outside of the accommodation hole 30D, and thus it is possible to suppress an increase in the size of the gap 42 and favorably adjust the size of the gap 42.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a pretensioner device in which a gas supply mechanism supplies gas into a housing to move a connecting member to the side opposite to a webbing. [Background technology]

[0002] In the lap pretensioner device described in Patent Document 1 below, a webbing is connected to one end of a wire, and a piston is connected to the other end of the wire. Furthermore, the wire is housed in a base cartridge, and when a gas generator supplies gas to a pressure space on one side of the piston in the base cartridge, the piston is moved to the other side by the pressure of the gas, and the wire is moved to the other end.

[0003] A packing is housed in the seal hole in the base cartridge, and a wire passes through the seal hole and the packing. The wire is covered with a coating, and the coating is in contact with the packing.

[0004] In this lap pretensioner device, when the coating is pressed against the packing, the packing may be deformed and expanded in diameter out of the seal hole, which may increase the gap between the packing and the wire. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2023-12277 Summary of the Invention [Problem to be solved by the invention]

[0006] SUMMARY OF THE INVENTION In consideration of the above, an object of the present invention is to provide a pretensioner device that can effectively adjust the size of the gap between the adjustment member and the connecting member. [Means for solving the problem]

[0007] A pretensioner device of a first aspect of the present invention includes: a connecting member having one end connected to a webbing worn by an occupant; a movable member connected to the other end of the connecting member; a housing that houses the connecting member and has a housing hole through which the connecting member passes; a gas supply mechanism that supplies gas to a pressure space on one side of the movable member in the housing, thereby moving the movable member to the other side by the pressure of the gas, and thereby moving the connecting member to the other end side; a covering member that covers the connecting member; and an adjustment member that is housed in the housing hole and through which the connecting member passes, the dimension of the housing hole in the connecting member penetration direction being larger than the dimension of the connecting member penetration direction, and that is pressed by the covering member to adjust the size of the gap with the connecting member.

[0008] A pretensioner device according to a second aspect of the present invention is the pretensioner device according to the first aspect of the present invention, wherein the covering member is fixed to the housing.

[0009] A pretensioner device of a third aspect of the present invention is the pretensioner device of the first or second aspect of the present invention, wherein gas in the pressure space is discharged from between the covering member and the moving member to outside the housing through between the covering member and the connecting member and between the adjusting member and the connecting member.

[0010] A pretensioner device of a fourth aspect of the present invention is the pretensioner device of any one of the first to third aspects of the present invention, further comprising a change member that changes the discharge direction of gas discharged from the pressure space to the outside of the housing.

[0011] A pretensioner device according to a fifth aspect of the present invention is the pretensioner device according to any one of the first to fourth aspects of the present invention, wherein gas is sealed off from being discharged from the pressure space to the other side of the moving member.

[0012] A pretensioner device according to a sixth aspect of the present invention is the pretensioner device according to any one of the first to fifth aspects of the present invention, wherein the accommodating hole is enlarged on the covering member side. [Effects of the Invention]

[0013] In the pretensioner device of the first aspect of the present invention, one end of a connecting member is connected to the webbing worn by the occupant, and the other end of the connecting member is connected to a moving member. Furthermore, the connecting member is housed in a housing, and when a gas supply mechanism supplies gas to a pressure space on one side of the moving member within the housing, the moving member is moved to the other side by the pressure of the gas, and the connecting member is moved to the other end.

[0014] The adjusting member is accommodated in the accommodation hole of the accommodation body, and the connecting member passes through the accommodation hole and the adjusting member. Furthermore, the connecting member is covered by a covering member, and the covering member presses against the adjusting member to adjust the size of the gap between the adjusting member and the connecting member.

[0015] Here, the dimension of the accommodation hole in the direction of penetration of the connecting member is made larger than the dimension of the adjustment member in the direction of penetration of the connecting member, so that when the covering member presses the adjustment member, the adjustment member is prevented from deforming out of the accommodation hole and expanding in diameter, which would otherwise increase the gap between the adjustment member and the connecting member, and the size of the gap between the adjustment member and the connecting member can be suitably adjusted.

[0016] In the pretensioner device of the second aspect of the present invention, the covering member is fixed to the housing, which allows the covering member to easily press the adjustment member.

[0017] In the pretensioner device of the third aspect of the present invention, gas in the pressure space is discharged to the outside of the housing from between the covering member and the moving member, through between the covering member and the connecting member, and between the adjusting member and the connecting member, thereby making it possible to lengthen the path along which gas in the pressure space is discharged to the outside of the housing.

[0018] In the pretensioner device of the fourth aspect of the present invention, the change member changes the discharge direction of the gas discharged from the pressure space to the outside of the housing, thereby making it possible to appropriately change the discharge direction of the gas discharged from the pressure space to the outside of the housing.

[0019] In the pretensioner device of the fifth aspect of the present invention, the discharge of gas from the pressure space to the other side of the moving member is sealed, thereby restricting the discharge of gas from the pressure space to the other side of the moving member.

[0020] In the pretensioner device of the sixth aspect of the present invention, the accommodating hole is enlarged on the covering member side, which effectively prevents the adjusting member from being deformed out of the accommodating hole when the covering member presses the adjusting member. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a side view of a lap pretensioner device according to an embodiment of the present invention, as viewed from the left. [Figure 2] 1A and 1B are diagrams showing a lap pretensioner device according to an embodiment of the present invention, in which FIG. 1A is a perspective view seen from diagonally left from the front, and FIG. 1B is a perspective view seen from diagonally right from the front. [Figure 3] 1 is an exploded perspective view showing a lap pretensioner device according to an embodiment of the present invention, viewed obliquely from the rear left. FIG. [Figure 4] FIG. 1A is an exploded perspective view showing a main part of a lap pretensioner device according to an embodiment of the present invention, as viewed from the rear right, and FIG. 1B is a perspective view showing a piece of the lap pretensioner device, as viewed from the front. [Figure 5] 1 is a cross-sectional view of a lap pretensioner device according to an embodiment of the present invention, as viewed from the left. [Figure 6] FIG. 1A is a cross-sectional view seen from the left showing the main parts of a lap pretensioner device according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view seen from the rear showing the lap pretensioner device before the wire and packing are assembled. DETAILED DESCRIPTION OF THE INVENTION

[0022] Fig. 1 shows a side view from the left of a lap pretensioner device 10 as a pretensioner device according to an embodiment of the present invention. Furthermore, Fig. 3 shows an exploded perspective view of the lap pretensioner device 10 as seen diagonally from the rear left, and Fig. 5 shows a cross-sectional view of the lap pretensioner device 10 as seen from the left. In the drawings, the front of the lap pretensioner device 10 is indicated by an arrow FR, the right of the lap pretensioner device 10 is indicated by an arrow RH, and the top of the lap pretensioner device 10 is indicated by an arrow UP.

[0023] A lap pretensioner device 10 according to this embodiment constitutes a seatbelt device 12 for a vehicle (automobile), and the seatbelt device 12 is applied to a seat (not shown) inside the vehicle cabin. The seatbelt device 12 is provided with a retractor (not shown), which is installed on the outer side and lower side of the rear of the seat in the vehicle width direction. A long, strip-shaped webbing 14 (see FIG. 1 ) is retracted from its base end onto the retractor, and the webbing 14 is biased toward the retractor and is pulled out upward from the retractor. The retractor is provided with a locking mechanism, which locks the webbing 14 from being pulled out from the retractor in the event of a vehicle emergency (such as a collision).

[0024] The webbing 14 is movably passed through a through anchor (not shown) on the tip side of the retractor, and the through anchor is installed on the outer side and upper side of the rear part of the seat in the vehicle width direction. An anchor 16 (see Figures 1 and 3) is fixed to the tip of the webbing 14, and the anchor 16 is installed on the outer side and lower side of the rear part of the seat in the vehicle width direction. The webbing 14 is movably passed through a tongue (not shown) between the through anchor and the anchor 16.

[0025] A buckle (not shown) is provided on the inside and lower side of the rear part of the seat in the vehicle width direction. A tongue is engageable with the buckle, and when the tongue is engaged with the buckle, the webbing 14 is attached to the occupant seated in the seat. As a result, the portion of the webbing 14 between the through anchor and the tongue (shoulder webbing) is hung diagonally from the occupant's shoulders to their waists (including their chest), and the portion of the webbing 14 between the tongue and anchor 16 (lap webbing) is hung laterally around the occupant's waists. The engagement of the tongue with the buckle is releasable, and when the tongue is disengaged from the buckle, the webbing 14 is released from the occupant's waist.

[0026] The lap pretensioner device 10 is installed on the outer side and lower side (vehicle body side) of the rear of the seat in the vehicle width direction, and the front, right and upper sides of the lap pretensioner device 10 are oriented toward the front, right (outside the seat in the vehicle width direction) and upper side of the vehicle, respectively.

[0027] 1, 3, and 5, the lap pretensioner device 10 is provided with a metal wire 18 (see FIG. 6(B)) serving as a connecting member. The wire 18 is rope-shaped, and is formed by twisting together a plurality of long strands 18A, and the strands 18A are formed by twisting together a plurality of linear element wires 18B. An anchor 16 is fixed to the tip (one end) of the wire 18, and the anchor 16 moves integrally with the tip of the wire 18.

[0028] The base end portion (other end portion) of the wire 18 is housed in a metal, substantially cylindrical cylinder 20 serving as a guide member constituting the housing, and the axial direction of the cylinder 20 is in the front-rear direction.

[0029] A metal, substantially cylindrical piece 22 (see FIG. 4(B)) is housed within the cylinder 20 as a fixing member, and the base end of the wire 18 is inserted into the piece 22. The piece 22 is fixed to the base end of the wire 18 by crimping from the outer periphery, and the gap between the piece 22 and the wire 18 is sealed. An annular contact portion 22A is integrally formed coaxially on the front surface of the piece 22, and the contact portion 22A has a substantially rectangular cross section. The corner surface on the front and outer periphery of the contact portion 22A forms the contact surface 22B, and the contact surface 22B is curved convexly toward the rear as it approaches the outer periphery.

[0030] A metal, approximately cylindrical piston 24 serving as a moving member is coaxially housed in front of the piece 22 within the cylinder 20, and the wire 18 is coaxially inserted and approximately fitted within the piston 24. The outer peripheral surface of the piston 24 is fitted into the inner peripheral surface of the cylinder 20, and the piston 24 is guided by the cylinder 20 and is movable forward (one side) and rearward (the other side). The rear portion of the inner peripheral surface of the piston 24 is a coaxial expanded diameter surface 24A, which expands in diameter toward the rear. The contact surface 22B of the piece 22 (contact portion 22A) is in line contact with the expanded diameter surface 24A, thereby sealing the gap between the piston 24 and the piece 22. When the piston 24 is moved rearward, the piece 22 is moved rearward together with the piston 24, and the wire 18 is moved toward the base end (in the direction of arrow B in FIG. 1 , etc.).

[0031] An inclined surface 24B is formed coaxially on the outer peripheral surface of the piston 24, rearward of the front portion. The inclined surface 24B forms a concave portion of the outer peripheral surface of the piston 24 and is inclined radially outward of the piston 24 as it extends rearward. A plurality of spherical metal balls 26 are arranged between the inclined surface 24B and the inner peripheral surface of the cylinder 20 as restricting members, and the plurality of balls 26 are aligned in the circumferential direction of the cylinder 20. When the piston 24 moves forward, the balls 26 move rearward relative to the piston 24 and become engaged between the inclined surface 24B and the inner peripheral surface of the cylinder 20, thereby restricting the forward movement of the piston 24 and the piece 22 and restricting the movement of the wire 18 toward the tip side (in the direction of arrow A in FIG. 1 , etc.).

[0032] A seal groove 24C having a rectangular cross section is formed coaxially in the front portion of the outer circumferential surface of the piston 24, and an annular O-ring 28 serving as a seal is inserted into the seal groove 24C. The O-ring 28 is made of rubber and has a circular cross section. The O-ring 28 elastically contracts between the inner surface of the seal groove 24C and the inner circumferential surface of the cylinder 20, thereby providing a seal between the piston 24 and the cylinder 20.

[0033] A circular communication groove 24D is formed coaxially on the front surface of the piston 24, and the communication groove 24D is open to the front side.

[0034] A metal block-shaped base cartridge 30 is provided in front of the cylinder 20 as a housing member that constitutes the housing body, and the wire 18 is housed in the base cartridge 30. A bolt 32 is passed through the front part of the base cartridge 30 from the left side, and the base cartridge 30 is fixed to the vehicle body side by the bolt 32, thereby installing the lap pretensioner device 10 on the vehicle body side.

[0035] A substantially cylindrical fixing hole 30A is formed in the rear of the base cartridge 30. The fixing hole 30A has an axial direction in the front-rear direction and is open to the rear. The front end of the cylinder 20 is coaxially fitted into and fixed to the fixing hole 30A, thereby fixing the cylinder 20 to the base cartridge 30.

[0036] A substantially cylindrical gas hole 30B is formed in front of the fixing hole 30A in the base cartridge 30, and the gas hole 30B is arranged coaxially with the fixing hole 30A. The diameter of the gas hole 30B is smaller than the diameter of the fixing hole 30A, and the wire 18 is housed coaxially in the gas hole 30B.

[0037] A substantially cylindrical supply tube 30C is integrally formed with the base cartridge 30 above the gas hole 30B. The interior of the supply tube 30C is connected to the gas hole 30B, and the axial direction of the supply tube 30C is inclined forward as it extends downward. A lower portion of a substantially cylindrical gas generator 34 (micro gas generator) serving as a gas supply mechanism is inserted into the supply tube 30C from above, and the upper portion of the gas generator 34 abuts against the upper end surface of the supply tube 30C. A substantially cylindrical cap 36 with a bottom is fixed to the supply tube 30C from above. The gas generator 34 is fixed to the supply tube 30C by the cap 36, and the upper opening of the supply tube 30C is sealed. The gas generator 34 is electrically connected to the vehicle's control device 38 (see Figure 5), and in the event of a vehicle emergency (such as a collision), the gas generator 34 is controlled by the control device 38 to instantly eject high-pressure, high-temperature gas from its lower part, and the gas is supplied to the gas hole 30B through the supply tube 30C.

[0038] A substantially cylindrical storage hole 30D is formed in front of the gas hole 30B in the base cartridge 30, and the diameter of the storage hole 30D increases slightly toward the rear. The storage hole 30D is disposed coaxially with the gas hole 30B, and the wire 18 is coaxially housed (passes through) in the storage hole 30D.

[0039] A cylindrical rubber packing 40 (see FIG. 4(A)) serving as an adjustment member is coaxially accommodated in the accommodation hole 30D, and the front surface of the packing 40 is in contact with the front surface (bottom surface) of the accommodation hole 30D. The wire 18 passes coaxially through the packing 40, and gaps 42 are formed between the packing 40 and the wire 18 between the strands 18A of the wire 18 (see FIG. 6(B)). The outer diameter of the packing 40 before being accommodated in the accommodation hole 30D and before the wire 18 passes through is larger than the maximum diameter of the accommodation hole 30D, and the packing 40 is elastically contracted in the radial direction by the circumferential surface of the accommodation hole 30D. The inner diameter of the packing 40 before being accommodated in the accommodation hole 30D and before the wire 18 passes through is smaller than the maximum diameter of the wire 18, and the inner diameter of the packing 40 is elastically expanded by the wire 18. Furthermore, the axial dimension T (dimension in the direction in which the wire 18 penetrates) of the accommodating hole 30D is larger than the axial dimension S (dimension in the direction in which the wire 18 penetrates) of the packing 40 after it has been accommodated in the accommodating hole 30D and after the wire 18 has penetrated therethrough (see Figure 6(A)).

[0040] A metallic, substantially cylindrical guard pipe 44 (see FIGS. 4A and 6A) serving as a covering member is coaxially disposed in the gas hole 30B of the base cartridge 30, and the inner diameter of the guard pipe 44 is slightly larger than the maximum diameter of the wire 18. The wire 18 passes coaxially through the guard pipe 44, and the guard pipe 44 covers the wire 18. A circular plate-shaped flange 44A is coaxially formed integrally with the rear end of the guard pipe 44, and the flange 44A is sandwiched between the front surface (bottom surface) of the fixing hole 30A of the base cartridge 30 and the cylinder 20, thereby fixing the guard pipe 44 within the base cartridge 30. The piston 24 abuts against the flange 44A from the rear side, thereby restricting the forward movement of the piston 24 and the piece 22 and restricting the movement of the wire 18 toward the tip side. A predetermined number (four in this embodiment) of substantially rectangular insertion holes 44B are formed through the flange 44A, and the predetermined number of insertion holes 44B are curved along the circumferential direction of the flange 44A and are arranged at equal intervals around the circumferential direction of the flange 44A. The insertion holes 44B communicate with a communication groove 24D on the front surface of the piston 24, and the communication groove 24D communicates with the inside of the guard pipe 44.

[0041] The front end of the guard pipe 44 presses the radially middle portion of the rear end of the packing 40 forward, sealing the gap between the packing 40 (see FIG. 6(A)). The packing 40 elastically contracts in the axial direction (front-to-back direction) between the guard pipe 44 and the front surface (bottom surface) of the accommodating hole 30D, causing the inner circumferential surface of the packing 40 to elastically deform and intrude between the strands 18A of the wire 18, thereby adjusting the size of the gap 42 between the packing 40 and the wire 18. The rear end of the packing 40 elastically deforms and intrudes into the radially outer and inner sides of the guard pipe 44 due to the pressure from the guard pipe 44, and the packing 40 is elastically stretched rearward. As a result, the axial dimension S1 of the packing 40 (the dimension in the wire 18 penetration direction) after being pressed by the guard pipe 44 is elongated, and the axial dimension T of the accommodating hole 30D is larger than the axial dimension S1 of the packing 40 after being pressed by the guard pipe 44.

[0042] A cylindrical through hole 30E is formed in the base cartridge 30 in front of the accommodating hole 30D, and the through hole 30E extends in the front-rear direction and is open to the front. The diameter of the through hole 30E is smaller than the diameter of the accommodating hole 30D and slightly larger than the diameter of the wire 18, so that the wire 18 passes through the through hole 30E and extends to the front side of the through hole 30E. The central axis of the through hole 30E is located slightly above the central axis of the accommodating hole 30D, and the wire 18 is in contact with the upper end of the through hole 30E while being coaxial with the accommodating hole 30D and the packing 40.

[0043] A guide path 30F is formed at the front end of the base cartridge 30 above the passage hole 30E, and the lower end of the guide path 30F is connected to the front end of the passage hole 30E. The guide path 30F is curved in a convex shape toward the front, and the guide path 30F is open toward the front.

[0044] A metal, plate-shaped cover plate 46 (see FIGS. 2A and 2B) is disposed as a modified member on the left side (seat side) of the front of the base cartridge 30, and bolts 32 pass through and fix the cover plate 46. A substantially rectangular guide plate 46A is integrally formed with the front end of the cover plate 46, and the guide plate 46A protrudes to the right (the side opposite the seat) to close the front side of the passage hole 30E and the front side of the lower portion of the guide path 30F, and is inclined upward as it extends forward.

[0045] A wire 18 is inserted into the guide path 30F, and the wire 18 is bent upward by the guide plate 46A of the cover plate 46 and passes through the lower part of the guide path 30F, so that the wire 18 extends in an upward direction as it moves forward from the guide path 30F.

[0046] Next, the operation of this embodiment will be described.

[0047] In the seat belt device 12 configured as described above, in the lap pretensioner device 10, the piston 24 abuts against the flange 44A of the guard pipe 44 inside the base cartridge 30 from the rear, restricting the forward movement of the piston 24 and the piece 22, thereby restricting the movement of the wire 18 toward the tip end, and restricting the extension of the anchor 16. In addition, the tongue of the webbing 14 engages with the buckle, thereby fastening the webbing 14 to the occupant.

[0048] In the event of a vehicle emergency (such as a collision), the locking mechanism of the retractor locks the webbing 14 from being pulled out from the retractor, thereby restraining the occupant with the webbing 14.

[0049] Furthermore, in the event of a vehicle emergency, the lap pretensioner device 10 is activated under the control of the control device 38, and the gas generator 34 instantaneously supplies high-pressure, high-temperature gas to the gas hole 30B via the supply tube 30C of the base cartridge 30. As a result, the gas enters the front side of the piston 24 through the insertion hole 44B of the flange 44A of the guard pipe 44, and the piston 24 and the piece 22 are moved rearward by the pressure of the gas, causing the wire 18 to move toward the base end while sliding against the inner circumferential surface of the packing 40. As a result, the anchor 16 is pulled diagonally downward and rearward, increasing the tension in the webbing 14 and increasing the restraining force of the webbing 14 on the occupant.

[0050] Incidentally, a guard pipe 44 covers the wire 18 at the gas hole 30B of the base cartridge 30. Therefore, the guard pipe 44 can prevent the high-pressure, high-temperature gas from the gas generator 34 from being directly sprayed onto the wire 18, thereby protecting the wire 18.

[0051] Furthermore, the contact surface 22B of the piece 22 (contact portion 22A) is in line contact with the expanded diameter surface 24A of the piston 24, thereby sealing the gap between the piston 24 and the piece 22. This prevents gas supplied from the gas generator 34 to a pressure space 48 (including the inside of the supply tube 30C) between the piston 24 and the piece 22 due to activation of the lap pretensioner device 10 from being discharged to the rear side of the piston 24 through between the inner circumferential surface of the piston 24 and the wire 18. This prevents gas in the pressure space 48 from being rapidly discharged to the rear side of the piston 24 when the lap pretensioner device 10 is activated, thereby preventing a decrease in the moving force of the piston 24, piece 22, wire 18, and anchor 16 due to gas pressure, and effectively increasing the tension of the webbing 14. Furthermore, after activation of the lap pretensioner device 10, the gas in the pressure space 48 is slowly discharged to the rear side of the piston 24, preventing it from being discharged from the rear side of the cylinder 20.

[0052] Furthermore, the guard pipe 44 presses against the packing 40, causing the packing 40 to elastically contract in the axial direction, and the inner circumferential surface of the packing 40 enters between the strands 18A of the wire 18 due to elastic deformation, adjusting the size of the gap 42 between the packing 40 and the wire 18. As a result, the discharge of gas supplied from the gas generator 34 to the pressure space 48 between the piston 24 and the piece 22 by the operation of the wrap pretensioner device 10 (discharge from between the flange 44A of the guard pipe 44 and the piston 24 to between the inner circumferential surface of the guard pipe 44 and the wire 18, through the gap 42 between the packing 40 and the wire 18, and between the inner circumferential surface of the passage hole 30E of the base cartridge 30 and the wire 18 to the front side of the base cartridge 30) is adjusted. As a result, when the lap pretensioner device 10 is activated, gas in the pressure space 48 is prevented from suddenly passing through the gap 42 between the packing 40 and the wire 18, and a decrease in the moving force of the piston 24, piece 22, wire 18, and anchor 16 due to gas pressure is prevented, thereby appropriately increasing the tension of the webbing 14. Furthermore, after the lap pretensioner device 10 is activated, gas in the pressure space 48 is able to pass through the gap 42 between the packing 40 and the wire 18 at a low speed, allowing the gas to be discharged to the front side of the base cartridge 30.

[0053] Furthermore, after the lap pretensioner device 10 is activated, the gas in the pressure space 48 is discharged from between the flange 44A of the guard pipe 44 and the piston 24 to the front side of the base cartridge 30, through the gap between the inner circumferential surface of the guard pipe 44 and the wire 18, the gap 42 between the packing 40 and the wire 18, and the gap between the inner circumferential surface of the passage hole 30E of the base cartridge 30 and the wire 18. This makes it possible to lengthen the path along which the gas in the pressure space 48 is discharged to the front side of the base cartridge 30, and to reduce the temperature and speed of the gas discharged to the front side of the base cartridge 30.

[0054] Furthermore, the insertion hole 44B of the flange 44A of the guard pipe 44 is communicated with the communication groove 24D on the front surface of the piston 24, and the communication groove 24D is communicated with the inside of the guard pipe 44. For this reason, even if, during activation of the lap pretensioner device 10, a large forward load is applied by the occupant to the piston 24 via the webbing 14, anchor 16, wire 18, and piece 22, and the piston 24 is unable to move rearward due to the pressure of the gas in the pressure space 48, the gas in the pressure space 48 can be discharged to the front side of the base cartridge 30 through the insertion hole 44B, the communication groove 24D, the gap between the inner circumferential surface of the guard pipe 44 and the wire 18, the gap 42 between the packing 40 and the wire 18, and the gap between the inner circumferential surface of the passage hole 30E of the base cartridge 30 and the wire 18.

[0055] Furthermore, the guide plate 46A of the cover plate 46 protrudes to the right (opposite the seat), and the discharge direction of the gas discharged to the front side of the base cartridge 30 is changed to the right by the guide plate 46A. This makes it possible to prevent the gas from being discharged to the left side of the base cartridge 30 (toward the occupant sitting in the seat), and also to reduce the temperature and velocity of the gas discharged from the base cartridge 30.

[0056] Here, after the packing 40 is accommodated in the accommodation hole 30D of the base cartridge 30, the axial dimension T of the accommodation hole 30D is made larger than the axial dimension S of the packing 40 after the wire 18 has passed through and before it is pressed by the guard pipe 44. Therefore, when the guard pipe 44 presses the packing 40, the packing 40 elastically deforms (elastically stretches) outward from the accommodation hole 30D (toward the rear of the accommodation hole 30D) and expands in diameter, which prevents the gap 42 between the packing 40 and the wire 18 from becoming larger, and the size of the gap 42 between the packing 40 and the wire 18 can be suitably adjusted.

[0057] Moreover, after the packing 40 is accommodated in the accommodation hole 30D of the base cartridge 30, the axial dimension T of the accommodation hole 30D is made larger than the axial dimension S1 of the packing 40 after the wire 18 has passed through and after it has been pressed by the guard pipe 44. Therefore, when the guard pipe 44 presses the packing 40, the packing 40 is not elastically deformed out of the accommodation hole 30D and does not expand in diameter, so the gap 42 between the packing 40 and the wire 18 does not become larger, and the size of the gap 42 between the packing 40 and the wire 18 can be appropriately adjusted.

[0058] Furthermore, the diameter of the accommodating hole 30D of the base cartridge 30 increases toward the rear side (toward the guard pipe 44), which effectively prevents the packing 40 from being elastically deformed out of the accommodating hole 30D when the guard pipe 44 presses the packing 40.

[0059] Furthermore, the flange 44A of the guard pipe 44 is clamped between the front surface of the fixing hole 30A of the base cartridge 30 and the cylinder 20, and the guard pipe 44 is fixed inside the base cartridge 30. This allows the guard pipe 44 to easily press the packing 40, and also increases the accuracy of the amount of pressing of the guard pipe 44 against the packing 40.

[0060] Furthermore, the central axis of the passing hole 30E of the base cartridge 30 is positioned slightly above the central axis of the accommodating hole 30D, so that the wire 18 is in contact with the upper end of the passing hole 30E while being positioned coaxially with the accommodating hole 30D and the packing 40. Therefore, when an upward load is applied to the wire 18 by the occupant via the webbing 14 and the anchor 16, it is possible to prevent the packing 40 from being deformed upward.

[0061] In this embodiment, the outer diameter of the packing 40 before it is accommodated in the accommodating hole 30D of the base cartridge 30 and before the wire 18 passes through is larger than the maximum diameter of the accommodating hole 30D. However, the outer diameter of the packing 40 before it is accommodated in the accommodating hole 30D of the base cartridge 30 and before the wire 18 passes through may be the same as or smaller than the maximum diameter of the accommodating hole 30D, or the outer diameter of the packing 40 may be the same as or smaller than the minimum diameter of the accommodating hole 30D.

[0062] Furthermore, in this embodiment, the inner diameter of the packing 40 before it is housed in the housing hole 30D of the base cartridge 30 and before the wire 18 passes through is smaller than the maximum diameter of the wire 18. However, the inner diameter of the packing 40 before it is housed in the housing hole 30D of the base cartridge 30 and before the wire 18 passes through may be the same as or larger than the maximum diameter of the wire 18.

[0063] In this embodiment, the anchor 16 is fixed to the distal end of the wire 18. However, a buckle may be fixed to the distal end of the wire 18. [Explanation of symbols]

[0064] 10 lap pretensioner device (pretensioner device), 14 webbing, 18 wire (connecting member), 20 cylinder (housing), 24 piston (moving member), 30 base cartridge (housing), 30D housing hole, 34 gas generator (gas supply mechanism), 40 packing (adjusting member), 42 gap, 44 guard pipe (covering member), 46 cover plate (changing member), 48 pressure space

Claims

1. a connecting member having one end connected to a webbing attached to an occupant; a moving member connected to the other end of the connecting member; a housing in which the connecting member is housed and which has a housing hole through which the connecting member passes; a gas supply mechanism that supplies gas to a pressure space on one side of the movable member in the container, thereby moving the movable member to the other side by the pressure of the gas, and thereby moving the connecting member to the other end side; a covering member that covers the connecting member; an adjusting member that is accommodated in the accommodation hole, through which the connecting member passes, and whose dimension in the connecting member penetration direction is larger than that of the accommodation hole, and that is pressed by the covering member to adjust the size of the gap between the accommodation hole and the connecting member; A pretensioner device comprising:

2. 2. The pretensioner device according to claim 1, wherein the covering member is fixed to the housing.

3. 2. The pretensioner device according to claim 1, wherein gas in the pressure space is discharged from between the covering member and the moving member to outside the housing through between the covering member and the connecting member and between the adjusting member and the connecting member.

4. The pretensioner device according to claim 1 , further comprising a change member that changes the direction of gas discharged from the pressure space to the outside of the housing body.

5. 2. The pretensioner device according to claim 1, wherein the pressure space is sealed to prevent gas from being discharged to the other side of the moving member.

6. 2. The pretensioner device according to claim 1, wherein the housing hole is enlarged on the covering member side.

Images