JP2007223536A - Seat belt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress increase of cost to the minimum in a seat belt device accomplishing the seat belt device with good wearing property by solving a point that a webbing (seat belt) is hard to be drawn out and worn and accomplishing winding of an end of a shoulder belt side and an end of a lap belt side. <P>SOLUTION: In the seat belt device provided with the webbing 42 constituted by the shoulder belt 48 for restricting a shoulder part of an occupant 27 and the lap belt 49 for restricting a waist part of the occupant 27; and a tongue 48 for dividing the webbing 42 to the shoulder belt 48 and the lap belt 49 by movably penetrating the webbing 42, the end of the shoulder belt 48 side and the end of the lap belt 49 side are wound on a coaxial spindle 51. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a seat belt device capable of restraining an occupant to a seat at the time of collision or at the time of collision prediction.

As a seat belt device, a system called a three-point system is usually adopted, and the seat belt is composed of a shoulder belt and a lap belt, and is wound around an occupant seated with the shoulder belt and the lap belt, at the time of a collision or when a collision is predicted. What puts a seat belt in a locked state with a pretensioner has been put into practical use.
In recent years, as a seat belt device, an attempt to improve the restraining performance of an occupant and an attempt to improve wearability have been made.

As such a seat belt device, a device in which a dedicated pretensioner is provided on the seat belt side and a dedicated pretensioner is also provided on the lap belt side is known (for example, see Patent Document 1).
JP-A-11-170976 (6th page, FIG. 1)

The technique of Patent Document 1 will be described.
FIG. 9 is a diagram for explaining a conventional basic configuration. A seat belt device 200 includes a first pretensioner 202 provided on the vehicle body 201 side, and a through anchor 203 on the vehicle body 201 side from the first pretensioner 202. A webbing (seat belt) 204 provided at one end so as to extend freely, a tongue (belt metal fitting) 205 interposed between the webbing 204, and a buckle provided on the vehicle body side in order to attach the tongue 205 detachably 206 and a second pretensioner 207 provided on the side of the vehicle body 201 to attach the other end of the webbing 204 so as to be freely extendable. That is, the seat belt apparatus 200 is provided with a dedicated first pretensioner 202 on the shoulder belt 208 side of the webbing 204 and a dedicated second pretensioner 207 on the lap belt 209 side of the webbing 204.

  However, in the seatbelt device 200, for example, when the occupant (driver) 211 is small in size, the vehicle seat 212 is often slid in front of the vehicle body 201 for driving. In such a case, since the seat belt device 200 is fixed to the vehicle body 201, the seat belt device 200 is positioned behind the occupant, and it is necessary to pull out the webbing (seat belt) 204 for a long time, and it is difficult to pull out the webbing 204. There was a problem that the webbing 204 was difficult to wear.

  Further, in the seat belt device 200, the dedicated first pretensioner 202 is provided on the shoulder belt 208 side, and the dedicated second pretensioner 207 is provided on the lap belt 209 side, so that the cost of the seat belt device 200 increases. It was to invite.

  In other words, a seat belt device that allows the seat belt to be easily pulled out and attached is desired. Further, a seat belt device that can wind up the end portion on the shoulder belt side and the end portion on the lap belt side and that can suppress an increase in cost to a minimum is desired.

  The present invention solves the problem that it is difficult to pull out the webbing (seat belt) and the webbing is difficult to wear, and provides a seat belt device with good wearability, and winds the end on the shoulder belt side and the end on the lap belt side. It is an object of the present invention to provide a seat belt apparatus that can be removed and that can suppress an increase in cost to a minimum.

  The invention according to claim 1 is divided into a shoulder belt and a lap belt that are configured to include a shoulder belt that restrains the shoulder portion of the occupant and a lap belt that restrains the waist portion of the occupant, and a webbing movably penetrating the webbing. A seatbelt device comprising a tongue, wherein an end on the shoulder belt side and an end on the lap belt side are wound around a coaxial spindle.

  The invention according to claim 2 is characterized in that the spindle is arranged on the vehicle seat side.

  The invention according to claim 3 is characterized in that the spindle is provided with a large-diameter portion for winding the end portion on the shoulder belt side and a small-diameter portion for winding the end portion on the lap belt side.

  The invention according to claim 4 is characterized in that the end portion on the shoulder belt side and the end portion on the lap belt side are overlapped and wound around a spindle.

  The invention according to claim 5 is characterized in that the webbing is provided with holding means for holding the tongue in a predetermined position in a non-mounted state.

  In the invention according to claim 1, since the end portion on the shoulder belt side and the end portion on the lap belt side are wound around the coaxial spindle, the shoulder belt and the lap belt can be wound simultaneously. As a result, for example, the occupant can be quickly restrained by the winding ability equivalent to the case where the dedicated pretensioner (winding device) is provided on the shoulder belt side and the lap belt side, thereby improving the protective effect while minimizing the increase in cost. There is an advantage that it can be suppressed to the limit.

  In the invention according to claim 2, since the spindle is arranged on the vehicle seat side, the webbing can be moved back and forth as the vehicle seat moves back and forth. As a result, the seat belt can be easily pulled out and the webbing can be easily attached. In other words, there is an advantage that it is possible to improve the seatability of the seat belt device.

  In the invention according to claim 3, since the spindle is provided with a large diameter portion for winding the end portion on the shoulder belt side and a small diameter portion for winding the end portion on the lap belt side, the winding of the shoulder belt is performed. The amount can be set larger than the winding amount of the lap belt. Generally, the withdrawal amount of the shoulder belt is larger than the withdrawal amount of the lap belt. Therefore, there is an advantage that the usability of the seat belt device can be improved.

  In the invention according to claim 4, since the end portion on the shoulder belt side and the end portion on the lap belt side are overlapped and wound around the spindle, there is an advantage that the cost of the seat belt device can be reduced.

  In the invention according to claim 5, since the webbing is provided with the holding means for holding the tongue in a predetermined position in a non-mounted state, the webbing can be held in a predetermined position. As a result, there is an advantage that the webbing pull-out property can be improved.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a vehicle employing a seat belt device according to the present invention.
In the figure, 10 is a vehicle, 11 is a vehicle body, 12 is a passenger compartment, 14 is a bonnet, 16 is a front pillar, 17 is a windshield, 18 is a front door, 19 is a rear door, 21 is a roof, 22 is a front wheel, and 23 is A front fender, 24 is a center pillar, 25 is a steering, 31 is a vehicle seat, and the seat belt device 40 according to the present invention can wind up the shoulder belt 48 side end and the lap belt 49 side end. In this device, the webbing (seat belt) 42 is improved.

  FIG. 2 is a front view of the seat belt device and the vehicle seat according to the present invention. The vehicle seat 31 includes a seat cushion 32 that supports the waist and legs of the occupant 27 and a seat back that supports the back of the occupant 27. 33 and a headrest 34 that supports the head of the occupant 27.

  The seat belt device 40 includes a pretensioner (winding device or retractor) 41 provided on the outer surface 32a of the seat cushion 32, a webbing (seat belt) 42 provided with both ends extending from the pretensioner 41, and a vehicle. A belt guide (through anchor) 43 for guiding the webbing 42 by being provided above the side surface of the chamber 12 (provided on the center pillar 24), a tongue (belt metal fitting) 44 interposed between the webbing 42, and the tongue 44 are attached and detached. A buckle 45 provided on the inner side surface 32b of the seat cushion 32 for free attachment, and a holding means 46 for holding the tongue 44 at a predetermined position on the webbing 42 when not attached.

  FIG. 3 is a plan view of the seat belt device and the vehicle seat according to the present invention. The webbing 42 passes through the shoulder of the occupant 27 from the pretensioner 41 and passes to the waist portion in a raked manner, and the shoulder belt. And a lap belt 49 that wraps around the abdomen of the occupant 27 around the vehicular seat 31 from the front end of the occupant 27 substantially horizontally.

  The pretensioner (winding device) 41 includes a spindle 51 that winds up the end of the shoulder belt 48 and the end of the lap belt 49, and a spring-type winding that drives the spindle 51 during normal use by being provided at one end of the spindle 51. A case 52 that houses the mechanism 52, the explosive winding mechanism 53 that is provided at the other end of the spindle 51 to drive the spindle 51 in an emergency, and the spindle 51, the spring-type winding mechanism 52, and the explosive winding mechanism 53. 54.

  The spindle 51 includes a large-diameter portion 56 that winds the end portion on the shoulder belt 48 side, and a small-diameter portion 57 that winds the end portion on the lap belt 49 side.

  FIG. 4 is an explanatory diagram of the pretensioner of the seat belt device according to the present invention. For example, when a dedicated pretensioner is provided at each of the end portion on the shoulder belt side and the end portion on the lap belt side, The withdrawal amount is larger than the withdrawal amount of the lap belt.

  Therefore, in the seat belt device 40, when the end portion on the shoulder belt 48 side and the end portion on the lap belt 49 side are wound around the coaxial spindle 51, a portion where the end portion on the shoulder belt 48 side is wound is large. The winding amount of the shoulder belt 48 was set to be larger than the winding amount of the lap belt 49 by reducing the diameter of the portion wound around the end portion on the lap belt 49 side.

FIGS. 5A and 5B are explanatory views showing a non-mounted state and a mounted state of the seat belt device according to the present invention.
(A) shows the retracted state of the webbing 42 when not attached, and the shoulder belt 48 and the lap belt 49 of the webbing 42 are wound and held by the pretensioner 41 by removing the tongue 44 from the buckle 45 as indicated by arrow a1. The tongue 46 can be held at a predetermined position (at a predetermined height) by the member 46.

  (B) shows the state in which the webbing 42 is routed at the time of wearing, and the occupant 27 (see FIG. 1) is seated on the vehicle seat 31 and pulls the tongue 44 toward the buckle 45 as shown by the arrow a2. The shoulder belt 48 is pulled out from the pretensioner 41 as shown by the arrow a3, the lap belt 49 is drawn out as shown by the arrow a4, and the tongue 44 is fitted to the buckle 45 as shown by the arrow a5.

In the seat belt device 40, since the pretensioner 41 and the buckle 45 are provided on the vehicle seat 31 side, the pretensioner 41 and the buckle 45 also move as the vehicle seat 31 moves back and forth, so that the webbing 42 is easily attached. .
Further, in the seat belt device 40, the shoulder belt 48 and the lap belt 49 can be pulled out simultaneously from the pretensioner 41, so that the webbing 42 can be pulled out lightly at the time of wearing.

  FIG. 6 is a perspective view of the seat belt device according to the present invention. The seat belt device 40 includes a shoulder belt 48 that restrains the shoulder portion of the occupant 27 and a webbing 42 that includes a lap belt 49 that restrains the waist portion of the occupant 27. In the seatbelt device provided with a tongue 44 divided into a shoulder belt 48 and a lap belt 49 by movably penetrating the webbing 42, an end on the shoulder belt 48 side and an end on the lap belt 49 side It can be said that is wound around a coaxial spindle 51.

  For example, it is preferable if the increase in cost can be minimized when the shoulder belt side end and the lap belt side end can be wound. In addition, it is preferable that the webbing can be easily pulled out and the seat belt can be easily mounted, since the mounting property of the seat belt device can be improved.

Therefore, the shoulder belt 48 and the lap belt 49 can be wound simultaneously by winding the end portion on the shoulder belt 48 side and the end portion on the lap belt 49 side around the coaxial spindle 51. As a result, for example, the occupant is quickly restrained by the winding ability equivalent to the case where the dedicated pretensioner (winding device) is provided on the shoulder belt 49 side and the lap belt 49 side, and the protective effect is enhanced, while the cost is increased. Can be minimized.
In particular, since the shoulder belt 48 and the lap belt 49 are coaxially wound, the winding amount per rotation of the spindle 51 is larger than that of the conventional pretensioner 202 (see FIG. 9), in other words, with a small amount of rotation. Many belts can be wound. Therefore, the drive amount of the explosive winding mechanism 53 can be reduced, and the belt can be wound up instantaneously.

It can be said that the seat belt device 40 has the spindle 51 arranged on the vehicle seat 31 side.
By disposing the spindle 51 on the vehicle seat 31 side, the webbing 42 can be moved back and forth as the vehicle seat moves back and forth. As a result, the webbing 42 can be easily pulled out and the webbing 42 can be easily attached. That is, it is possible to improve the wearability of the seat belt device 40. For example, when the occupant (driver) 27 is small in size, the vehicle seat 31 is often slid in front of the vehicle body 11 (see FIG. 1) for driving. Even in such a case, the seat belt device 40 is easy to handle and wear the webbing 42.

  It can be said that the seat belt device 40 includes a spindle 51 having a large-diameter portion 56 that winds an end portion on the shoulder belt 48 side and a small-diameter portion 57 that winds an end portion on the lap belt 49 side.

  The spindle 51 is provided with a large-diameter portion 56 that winds the end portion on the shoulder belt 48 side and a small-diameter portion 57 that winds the end portion on the lap belt 49 side, so that the winding amount of the shoulder belt 48 can be reduced. More than the winding amount of the lap belt 49 can be set. Generally, the withdrawal amount of the shoulder belt is larger than the withdrawal amount of the lap belt. Therefore, the usability of the seat belt device 40 can be improved.

The seat belt device 40 can be said to be provided with holding means 46 for holding the tongue 44 in a predetermined position in the non-mounted state on the webbing 42.
The webbing 42 can be held at a predetermined position by providing the webbing 42 with a holding means 46 that holds the tongue 44 at a predetermined position in a non-mounted state. As a result, the drawability of the webbing 42 can be improved.

FIG. 7 is a side view of a seat belt device according to another embodiment of the present invention. The same parts as those used in the seat belt device 40 (see FIG. 1) are denoted by the same reference numerals, and detailed description thereof is omitted.
In the figure, 24 is a center pillar, 27 is an occupant, 31 is a vehicle seat, 32 is a seat cushion, 33 is a seat back, 34 is a headrest, and the seat belt device 70 has an outer surface 32a (see FIG. 2). A pretensioner (winding device or retractor) 71 provided in the reference), a webbing (seat belt) 72 provided to extend both ends from the pretensioner 71, and provided above the side surface of the vehicle compartment 12 (center pillar). 24), a belt guide (through anchor) 73 for guiding the webbing 72, a tongue (belt metal fitting) 74 interposed between the webbing 72, and a seat cushion 32 for attaching the tongue 74 detachably. A buckle 75 provided on the side surface 32b and a predetermined position of the webbing 72 when not attached. A holding means 76 for holding the tang 74, it consists of.

FIG. 8 is an explanatory view of a pretensioner of a seat belt device according to another embodiment of the present invention, in which 81 is a spindle, 82 is a spring type winding device, 83 is an explosive type winding device, and 84 is a case. is there.
In the seat belt device 70, the end portion on the shoulder belt 78 side and the end portion on the lap belt 79 side are overlapped and wound around the spindle 81. That is, the end of the shoulder belt 78 and the end of the lap belt 79 are overlapped and wound around the spindle 81, so that the cost of the seat belt device 70 can be reduced.

In the seat belt device according to the present invention, as shown in FIG. 2, the buckle 45 is provided on the vehicle seat 31 side. However, the present invention is not limited to this, and the buckle may be provided on the vehicle body side. Good.
The large-diameter portion and the small-diameter portion may be formed not only by changing the shaft diameter of the spindle but also by changing the winding amount in the initial state with respect to the spindle having the same diameter.

  The seat belt device according to the present invention is suitable for use in passenger cars such as sedans and wagons.

It is a side view of the vehicle which employ | adopted the seatbelt apparatus which concerns on this invention. 1 is a front view of a seat belt device and a vehicle seat according to the present invention. 1 is a plan view of a seat belt device and a vehicle seat according to the present invention. It is explanatory drawing of the pretensioner of the seatbelt apparatus which concerns on this invention. It is explanatory drawing which shows the non-wearing state and mounting | wearing state of the seatbelt apparatus which concerns on this invention. 1 is a perspective view of a seat belt device according to the present invention. It is a side view of the seatbelt apparatus of another Example which concerns on this invention. It is explanatory drawing of the pretensioner of the seatbelt apparatus of another Example which concerns on this invention. It is a figure explaining the conventional basic composition.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 40, 70 ... Seat belt apparatus, 42 ... Webbing, 44 ... Tongue, 46 ... Holding means, 48 ... Shoulder belt, 49 ... Lap belt, 51, 81 ... Spindle, 56 ... Large diameter part, 57 ... Small diameter Department.

Claims (5)

A webbing configured of a shoulder belt that restrains the shoulder of the occupant and a lap belt that restrains the waist of the occupant, and a tongue that divides the shoulder belt and the lap belt by passing through the webbing movably. In the seat belt device,
A seat belt device, wherein an end on the shoulder belt side and an end on the lap belt side are wound around a coaxial spindle.   2. The seat belt device according to claim 1, wherein the spindle is arranged on a vehicle seat side.   3. The seat belt according to claim 2, wherein the spindle includes a large-diameter portion that winds an end portion on the shoulder belt side and a small-diameter portion that winds an end portion on the lap belt side. apparatus.   The seat belt device according to claim 2, wherein an end portion on the shoulder belt side and an end portion on the lap belt side are overlapped and wound around the spindle.   2. The seat belt device according to claim 1, wherein the webbing includes a holding unit that holds the tongue in a predetermined position when the webbing is not attached.

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