JP2011088478A - Seat belt retractor and seat belt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat belt retractor constituted to lead a foreign article from an upper side to the outside, and a seat belt device equipped with the seat belt retractor. <P>SOLUTION: A top cover 40 is installed on an upper side of a frame 20 equipped with side plate portions 22, 24 and a back plate portion 26. The top cover 40 is provided with a slit 42 in which a webbing 32 is inserted. The top cover 40 is tilted so as to increase height toward a front side, and provided with a weir portion 44 at a rear edge and a weir portion 46 at a front edge of the slit 42. The top cover 40 is supported by the back plate portion 20 through a bracket 38, and bulges to the outer side part from the side plate portions 22, 24. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a seat belt device provided in a vehicle and for restraining an occupant and a retractor thereof.

  As is well known, the seat belt device unwinds a seat belt from a retractor provided in a vehicle and locks the seat belt to a buckle by a tongue, thereby restraining an occupant to the seat.

  A seat belt retractor (hereinafter sometimes referred to as a retractor) includes a frame having a pair of side plate portions and a back plate portion that connects the side plate portions, and a reel disposed between the side plate portions. In a normal retractor, a spring or a motor for rotating the reel is arranged outside one side plate portion, and the vehicle has an acceleration (deceleration) of a predetermined value or more outside the other side plate portion. A reel lock mechanism is provided for locking the reel when it occurs or when the rotational angular acceleration of the reel exceeds a predetermined value.

  Further, a webbing guide may be provided above the frame (for example, Patent Document 1). FIG. 6 shows this seat belt retractor with a webbing guide.

  A reel 7 is disposed between the side plate portions 1 and 2 of the frame 4 including the side plate portions 1 and 2 and the back plate portion 3, a spring spring mechanism 5 is provided outside the side plate portion 1, and a reel lock is provided outside the side plate portion 2. A mechanism 6 is provided.

  The webbing 8 wound around the reel 7 is drawn upward in FIG. A webbing guide 9 through which the webbing 8 is inserted is provided on the upper portion of the back plate part 3. The webbing guide 9 has a rectangular frame shape, and a webbing 8 is inserted through a slit-shaped opening 9a inside the frame.

  The seat belt retractor is disposed in the B pillar or the C pillar, and may be pulled out to the vehicle interior side from the pull-out port at the top of the pillar. In such a case, foreign matters such as water (for example, drinks such as juice for passengers) and coins hardly enter the pillar from the outlet.

  However, a seat belt retractor is installed in the side trim as in Patent Document 2, and a webbing outlet is provided on the upper surface of the side trim, or a webbing outlet is provided in the armrest as in Patent Document 3. Thus, an outlet may be provided in the upper part of the seat back. Further, in an automobile such as a sports type, an outlet may be provided in the side portion of the seat cushion of the seat. In such a case, foreign matter such as water and coins may enter the outlet.

JP 2002-321595 A JP-A-7-89410 JP2002-29376 JP-A-10-181524

  As shown in FIG. 6, even if a small webbing guide 9 is provided, if foreign matter such as water or coins falls from above, the foreign matter may enter the inside of the frame 1.

  An object of the present invention is to provide a seat belt retractor configured to guide foreign matter from above to the outside of the frame, and a seat belt device including the seat belt retractor.

  The seat belt retractor of the present invention (Claim 1) is a retractor for a seat belt apparatus installed in a vehicle, and has a pair of side plate portions facing each other and a back plate portion connecting the rear edges of the side plate portions. In a seat belt retractor that has a frame and a reel that is rotatably installed between the side plate portions of the frame, and a webbing wound around the reel is pulled out, the seat belt retractor is disposed above the reel. A top cover supported by the frame for guiding foreign matter from above to the outside of the frame is provided.

  The seat belt retractor according to claim 2 is characterized in that, in claim 1, the front edge of the top cover is located near or in front of the upper axis of the reel.

  According to a third aspect of the present invention, the seat belt retractor according to the first or second aspect is characterized in that a side edge portion of the top cover projects outwardly from the side plate portion.

  The seat belt retractor according to claim 4 is the seat belt retractor according to claim 2 or 3, wherein the top cover is inclined so as to be higher toward the front in a state where the back plate portion is vertical, The first weir portion is erected from one side edge of the top cover to the other side edge.

  According to a fifth aspect of the present invention, there is provided the seat belt retractor according to the fourth aspect, wherein the top cover is provided with a slit through which the webbing is inserted, and a second weir portion is erected along at least a front edge portion of the slit. It is characterized by being.

  The seat belt retractor of claim 6 is characterized in that, in claim 5, the width of the slit is 1.3 to 2.0 times the thickness of the webbing.

  The seat belt device of the present invention includes such a seat belt retractor.

  In the seat belt retractor of the present invention, since the top cover is provided above the reel, foreign matter falling from above is guided out of the frame.

  According to the seat belt retractor of the second aspect, it is possible to prevent foreign matter from entering a region surrounded by the axial center portion of the reel, the pair of side plate portions, and the back plate portion.

  According to the seat belt retractor of the third aspect, the foreign matter dropped from the side edge of the top cover is prevented from entering the inside of the frame.

  According to the seat belt retractor of the fourth aspect, the foreign matter, particularly water, that has fallen on the top cover moves to the rear of the top cover, and further moves to the top cover side edge along the first dam portion.

  In the seat belt retractor according to the fifth aspect, the second dam portion prevents foreign matter dropped on the top cover on the front side of the slit from entering the slit.

  In the seat belt retractor according to the sixth aspect, since the slit width is small, foreign matter is prevented from entering the gap between the slit inner edge and the webbing.

It is a perspective view from the back of a seatbelt retractor concerning an embodiment. It is a rear view of the seatbelt retractor which concerns on embodiment. It is the III-III sectional view taken on the line of FIG. It is a perspective view of a top cover. It is the VV sectional view taken on the line of FIG. It is a perspective view of the conventional seatbelt retractor. It is a schematic block diagram inside the motor vehicle provided with the seatbelt apparatus which concerns on embodiment. It is a schematic block diagram inside the motor vehicle provided with the seatbelt apparatus which concerns on embodiment.

  Hereinafter, the seat belt retractor 10 according to the embodiment will be described with reference to FIGS. 1 to 5.

  The frame 20 includes a pair of side plate portions 22 and 24 that face each other, and a back plate portion 26 that connects the side plate portions 22 and 24. A reel 28 is rotatably installed between the side plate portions 22 and 24. Both end sides of the shaft of the reel 28 protrude from the side plate portions 22 and 24. A reel column is mounted on the outer periphery of the shaft, and the webbing 32 is wound around the reel column. The side plate portions 22 and 24 have front edges 22a and 24a and opposite rear edges 22b and 24b, and the back plate portion 26 connects the rear edges 22b and 24b.

  In the cover 34 provided on the outer surface side of the side plate portion 24, the rotation of the reel 28 is prevented when the vehicle is encountered in an emergency such as a collision or the seat belt is rapidly unwound due to other causes. A lock device is provided for preventing the webbing 32 from being unwound.

  In the cover 36 provided on the outer surface side of the side plate portion 22, a spring for energizing the reel 28 in the seat belt winding direction and the webbing 32 is wound up to a predetermined length when the vehicle collides, and the webbing 32 is pretensioned. A pretensioner mechanism is provided for applying the pressure.

  A plate-like bracket 38 is fixed to the upper portion of the back plate portion 26 by welding or the like. The bracket 38 may be constituted by the back plate portion 26 and a series of plate materials. As shown in FIG. 3, the bracket 38 is connected to the vertical portion 38A that rises upward from the back plate portion 26, and the vertical portion 38A, and becomes higher in the forward direction when the back plate portion 26 and the vertical portion 38A are vertical. The inclined portion 38B is inclined in this manner, and the standing portion 38C is erected upward from the front end of the inclined portion 38B. The front surface of the vertical bracket portion 38A and the rear surface of the back plate portion 26 are in close contact with each other and constitute the same plane.

  A top cover mounting opening 38a is provided in the bracket inclined portion 38B. The top cover mounting opening 38a has an elongated rectangular shape extending in a direction parallel to the back plate portion 26 (direction connecting the side plate portions 22 and 24).

  A top cover 40 is installed on the upper surface of the bracket 38. The top cover 40 is a plate-like member made of synthetic resin or metal, preferably synthetic resin such as nylon or fluorine resin having good slidability. As shown in FIGS. 3 to 5, the webbing insertion slit 42 is used. And a second dam portion 46 along the front edge of the slit 42 and a first dam portion 44 provided at the rear edge of the top cover 40. In addition, anchor portions 48 and 50 having an inverted L-shaped cross section project from the lower edge of the slit 42, and the anchor portions 48 and 50 are passed through the top cover mounting port 38a and to the lower edge of the top cover mounting port 38a. By locking, the top cover 40 is fixed to the bracket 38.

  The width of the slit 42 (width in the direction orthogonal to the longitudinal direction) is as small as 1.3 to 2.0 times, particularly 1.5 to 1.8 times the thickness of the webbing 32.

  As shown in FIG. 2, the right edge of the top cover 40 protrudes outward from the side plate 22, and the left edge protrudes outward from the side plate 24. The top cover 40 normally protrudes outward in the lateral direction so that the horizontal protruding width from the side plate portion 22 or 24 is 1 mm or more, particularly about 3 to 5 mm, but the protruding width is not limited to this.

  The rear edge of the top cover 40 is located flush with or behind the rear surface of the back plate portion 26. In this embodiment, the rear edge of the top cover 40 is substantially flush with the rear surface of the vertical portion 38 </ b> A of the bracket 38.

  Since the top cover 40 is in close contact with the upper surface of the inclined portion 38B of the bracket 38, similarly to the bracket 38, the top cover 40 is inclined so as to be higher toward the front in a state where the back plate portion 26 is vertical. The inclination angle θ (FIG. 3) is preferably about 15 ° to 45 °, particularly about 25 ° to 35 °.

  In a state where the back plate portion 26 is vertical, the front edge of the top cover 40 is located near the upper portion of the reel 28 axis. The horizontal distance from the front surface of the back plate portion 26 at the front edge of the top cover 40 is 70% or more, particularly 90% or more, of the horizontal distance L from the front surface of the back plate portion 26 to the axis of the reel 28. preferable. The front edge of the top cover 40 may be located in front of the axial center position of the reel 28.

  In the seat belt retractor 10 configured as described above, even if a foreign object falls from above, it is received by the top cover 40 and guided to the outside of the frame 20. When the foreign matter is a liquid, the liquid that has dropped onto the top cover 40 in front of the slit 24 is prevented from entering the slit 42 by the second dam portion 46. The liquid wraps around the second dam portion 46 to reach the first dam portion 44 and falls out of the frame 20 from the left and right ends of the first dam portion 44.

  When the liquid falls along the webbing 32, since the gap between the inner edge of the slit 42 and the webbing 32 is small, the liquid moves from the webbing 32 to the top cover 40, flows down on the top cover 40, and the first It falls out of the frame 20 from both ends of the weir part 44.

  In the above embodiment, the second dam portion 46 is provided only on the front edge side of the slit 42, but it may be provided on the rear edge side of the slit 42 or may be provided on the entire circumference of the slit 42.

  In the present invention, a liquid guide part may be provided for transferring the liquid falling from both ends of the first weir part 44 to the lower part of the frame or below it.

  The seat belt device of the present invention includes the seat belt retractor of the present invention. This seat belt device can be provided in any seat such as a front seat and a rear seat of a vehicle.

  FIGS. 7 and 8 are schematic configuration diagrams of the interior of an automobile provided with a three-point seat belt device having the seat belt retractor 10 of the present invention.

  One end of the webbing 32 of the seat belt device 90 of FIG. 7 is connected to the retractor 10 so as to be rewound, and the other end is fixed to the vehicle body by a mounting anchor 93. The middle part of the webbing 32 is passed through a shoulder anchor 94 and a tongue 95, respectively. A buckle device 96 to which a tongue 95 is attached is provided on the vehicle body center side. The shoulder anchor 94 is disposed at the upper part of the vehicle body pillar. The webbing 32 when the tongue 95 is attached to the buckle device 96 is indicated by a one-dot chain line.

In FIG. 7, the retractor 10 is arranged to wind up the shoulder-side webbing 32, but may be arranged to wind up the wrap-side webbing 32 as shown in FIG. In FIG. 8, the retractor 10A for winding the shoulder-side webbing 32 may be the retractor of the present invention, or may be another retractor.
FIGS. 7 and 8 show an example of the seat belt apparatus of the present invention, and the seat belt apparatus of the present invention is not limited to that of FIGS.

DESCRIPTION OF SYMBOLS 10 Seat belt retractor 20 Frame 22, 24 Side board part 26 Back board part 28 Reel 32 Webbing 38 Bracket 40 Top cover 42 Slit 44 1st dam part 46 2nd dam part 48, 50 Anchor part 90 Seat belt apparatus

Claims (7)

A retractor for a seat belt device installed in a vehicle,
A frame having a pair of opposite side plate portions and a back plate portion connecting the rear edges of the side plate portions;
A reel installed rotatably between the side plate portions of the frame;
In the seat belt retractor from which the webbing wound around the reel is pulled out,
A seat belt retractor comprising a top cover disposed above the reel and supported by the frame for guiding foreign matter from above to the outside of the frame.   2. The seat belt retractor according to claim 1, wherein a front edge of the top cover is located near or in front of an upper axis of the reel.   3. The seat belt retractor according to claim 1, wherein a side edge portion of the top cover projects outwardly from the side plate portion. In Claim 2 or 3, the top cover is inclined so as to be higher toward the front in a state where the back plate portion is vertical.
A seat belt retractor characterized in that a first weir portion is erected from one side edge of the top cover to the other side edge at the rear edge of the top cover.   5. The seat according to claim 4, wherein a slit through which the webbing is inserted is provided in the top cover, and a second dam portion is provided upright along at least a front edge portion of the slit. Belt retractor.   6. The seat belt retractor according to claim 5, wherein the width of the slit is 1.3 to 2.0 times the thickness of the webbing.   A seat belt apparatus comprising the seat belt retractor according to any one of claims 1 to 6.

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