JP3147802B2 - Webbing take-up device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a webbing take-up device used in a vehicle seat belt device and the like,
The present invention relates to a webbing take-up device that stops pulling out webbing when an acceleration sensor detects a sudden deceleration of a vehicle and restrains an occupant on a seat.

[0002]

2. Description of the Related Art A vehicle is equipped with a seat belt device for restraining an occupant sitting on a seat to an appropriate posture. As shown in FIG. 10, this seatbelt device, for example, a three-point seatbelt device, often adopts a configuration in which the driver's seat S1 side and the passenger's seat S2 side are symmetrical to each other.

Here, the seat belt device on the passenger seat S2 side includes a bracket 10 welded to a side sill A on the vehicle body side.
0, a retractor (webbing take-up device) 101 integrally attached thereto, a shoulder anchor 103 for locking the webbing 102 from the retractor 101 on the upper side wall of the vehicle cabin, and a tongue 104 for webbing from the shoulder anchor 103. A buckle 105 detachably connected to the center of the vehicle cabin via a tongue 104, and an anchor plate 106 provided at the tip of the webbing 102 from the tongue 104
And an anchor bolt B for fastening the anchor plate to the side sill A by overlapping the anchor plate with the bracket 100.

[0004] The retractor 101 used here can pull out or wind up the webbing 102 having a length corresponding to the body shape of the occupant, and also as an emergency locking retractor (ELR) that prevents the webbing from being pulled out when the vehicle suddenly decelerates. The function of is added. As shown in FIG. 12, the retractor 101 has a base frame 1 having a box frame shape.
07, the base frame 107 has a winding shaft 108 for winding the webbing 102, a locking means 109 for appropriately stopping the rotation of the winding shaft 108, and allowing the rotation of the winding shaft 108 at normal times. A lock instructing unit 110 for instructing the locking unit 109 to lock when the vehicle suddenly decelerates, and an acceleration sensor 111 for issuing a lock instruction to the lock instructing unit 110 when the vehicle suddenly decelerates are provided.

Here, the acceleration sensor 111 is shown in FIG.
As shown in (a), a weight 113 and a lever 114 are provided in a sensor holder 112 attached to the base frame 107 side, and are horizontally supported when an acceleration due to sudden deceleration of the vehicle is applied (in a direction perpendicular to the paper surface). In conjunction with the tilting of the weight 113 (see FIG. 11B), the lever 114 meshes with the outer peripheral teeth a of the flywheel 115 in the lock instruction means 110, causing a rotation delay on the flywheel 115 side. In response to this, the lock instruction means 110 transmits a lock instruction to the lock means 109, and the lock means 109 performs a lock operation to stop the rotation of the winding shaft 108.

[0006] The retractor 101 uses an acceleration sensor 111 that detects sudden deceleration of the vehicle to provide lock instruction means 11.
The flywheel 115 within 0 causes a rotation delay, and the locking means 109 interlocked therewith locks the rotation of the winding shaft 108 in the webbing withdrawing direction and stops the webbing withdrawal. As a result, the seat belt device can restrain the occupant in a proper posture on the seat even when the vehicle is suddenly decelerated by the webbing 102 from which the withdrawal is stopped. In addition,
An example of such an ELR type retractor, which is a webbing take-up device provided with an acceleration sensor, is disclosed in Japanese Unexamined Utility Model Publication No.
No. 71065.

[0007]

When the three-point seat belt device is mounted on each vehicle, the mounting position and the mounting angle on the body side are different.
The retractor 101 shown in FIG. 12 is restricted by a seat position, a relative positional relationship with the shoulder anchor 103, and the like.
The base frame 107 is fixed in a state of being inclined by θ1 in the vehicle front-rear direction X. In this case, a connecting portion C is formed at the upper end of the bracket 100, the connecting portion d of the retractor 101 is placed on the connecting portion C at an inclination angle θ1, and a bolt (see FIG. (Not shown).

However, as shown in FIGS. 13 (a) and 13 (b), when an attempt is made to share the retractor 101 for the passenger seat and the retractor 101a for the driver's seat, the acceleration sensors 111, 111a of each retractor, and The inclination of the base frame 107 on which the sensor is mounted is different from θ1 and θ2. On the other hand, the weight 113 of the acceleration sensor 111 needs to be held in a horizontal state. Therefore, FIG.
FIG. 1A shows a front passenger retractor 101 shown in FIG.
A retractor 1 for the driver's seat having the same appearance performance as shown in FIG.
When the first and second retractors 101a and 101a are used, different acceleration sensors 11 are provided on the left and right retractors 101 and 101a.
1, 111a needs to be mounted, and the two acceleration sensors 1
11, 111a could not be shared.

As described above, when the seat belt device is mounted on the left and right seats of the vehicle, if the left and right retractors used here are to be shared, the left and right retractors 10 are used in advance.
1 and 101a, left and right acceleration sensors 111,
After manufacturing 111a, it is necessary to incorporate these into each base frame 107 without making a mistake in the left and right. For this reason, when trying to share the retractors 101 and 101a on the left and right sides, only the acceleration sensor requires two parts, which leads to an increase in cost and disadvantages in terms of assembly workability and parts management. Yes, it was a problem. SUMMARY OF THE INVENTION It is an object of the present invention to provide a webbing take-up device which can reduce costs by reducing the number of parts, improve assembling workability, and simplify parts management.

[0010]

In order to achieve the above-mentioned object, a first aspect of the present invention provides a base frame integrally connected to a connecting portion on a vehicle body side, and an occupant pivotally supported in the base frame. A take-up shaft for winding the webbing for restraint, a locking means for stopping the webbing withdrawal rotation of the take-up shaft, a weight inclined in response to sudden deceleration of the vehicle, and an acceleration sensor having a lever interlocked with the weight; Lock instructing means for permitting rotation of the winding shaft and instructing the locking means to lock in response to the displacement of the lever when the vehicle suddenly decelerates. In the webbing take-up device for stopping the webbing withdrawal rotation of the take-up shaft,
When the weight base on which the weight is placed is pivotally supported on the base frame side via a pin extending in the vehicle width direction, and when the base frame is integrally connected to the connection portion with the direction regulating portion provided on the vehicle body side, A support surface for holding the upper surface of the weight table at a predetermined angle is formed.

Therefore, the inclination of the support surface of the direction regulating portion is set in advance so that the upper surface of the weight table can be held horizontally when the base frame is integrally joined to the joint portion, and the support surface having the same inclination is formed. In this case, when the base frame is integrally coupled to the coupling portion on the vehicle body side, the support surface of the direction regulating portion abuts on the weight table, and the weight table rotates around the pin extending in the vehicle width direction,
The weight table can be held horizontally.

According to a second aspect of the present invention, in the webbing retractor according to the first aspect, the connecting portion is formed on a bracket integrally connected to the vehicle body. Therefore, the connecting portion and the direction regulating portion are formed on the single bracket.

[0013]

FIG. 1 shows a webbing winding device according to the present invention. Since this webbing take-up device is mounted instead of the retractor 101 of the three-point seat belt device on the passenger seat S2 side shown in FIG. 10, the same members are denoted by the same reference numerals, and the description thereof will be repeated. Abbreviate. The retractor 1 as the webbing take-up device in FIG. 1 includes a passenger seat S2 (FIG. 10).
The webbing 4 having a length corresponding to the body shape of the occupant sitting on the webbing 4 is drawn out or wound up. In addition, an ELR function described below is provided to prevent the webbing 4 from being pulled out when the vehicle suddenly decelerates. The lower portion of the bracket 3 for connecting the retractor 1 to the vehicle body side is welded to the side sill A side of the vehicle body similarly to the bracket 100 of FIG.

The bracket 3 has a through hole 5 formed in the lower center thereof, and the anchor bolt 106 is screwed into a weld bolt (not shown) on the back side of the side sill A via the through hole 5 to thereby connect the anchor plate 106 (see FIG. 10). Has also tightened. At the upper part of the bracket 3, a connecting portion C and a direction regulating portion 26 near the connecting portion C are protruded.

As shown in FIG. 3, the bracket 3 is welded to the side sill A such that its center line L1 is vertical. In this state, the connecting portion C is formed so that the connecting portion d of the retractor 1 can be placed at an inclination angle θ1 with respect to the front-rear direction X of the vehicle body, and further, is screwed into the screw hole e on the connecting portion C. Retractor 1 with bolts (not shown)
Can be tightened and fixed. The direction restricting portion 26 extends from the rear end of the connecting portion C in the vehicle width direction Y (see FIG. 3), and has an upwardly-facing support surface h at its distal end. The support surface h is in contact with a bottom wall g of a weight base 123 (see FIG. 5) described later, and supports the weight base 123 so as not to rotate.

As shown in FIGS. 1 and 2, the retractor 1 includes a substantially box-shaped base frame 7 made of sheet metal. This base frame 7
Is formed by a main wall 701 extending in the front-rear direction X of the vehicle, front and rear walls 702 and 703 extending in the vehicle width direction Y from front and rear ends thereof, and a connecting plate 704. Are pivotally connected via a bearing member (not shown). The take-up shaft 8 supports the webbing 4 at the center thereof in a take-up state. A take-up spring (not shown) is attached to a front end of the take-up shaft 8, and the spring is covered with a front cover 9. EL on the rear end side of winding shaft 8
Lock means R1 for obtaining R function, lock instruction means R
2 and the acceleration sensor 12 are connected, and these are covered with a rear cover 25.

As shown in FIG. 2, a lock means R1 is provided with a ratchet 13 integrally connected to the winding shaft 8, and a turn which can be engaged with and disengaged from the ratchet and is pivotally supported by the rear wall 703 via the shaft pin 30. A moving claw 14 is provided, and the webbing withdrawal rotation r1 (see FIG. 8) of the winding shaft 8 is stopped (locked) at an appropriate time.

The lock instructing means R2 is engaged with a retainer 15 integrally connected to the take-up shaft 8 and a pair of pins 16 projecting from the side wall of the retainer 15, and the retainer 1 is locked.
A hook 17 in the form of a sliding plate that can slide relatively in the alignment direction D (see FIG. 8) of a pair of pins with respect to the inner pin 5 and inner peripheral teeth 181 with which the hook 17 can be engaged are formed. A lock ring 18 that rotates (receives a lock) by receiving the rotation of the take-up shaft 8 only at the time of engagement, and a spring that is disposed between the hook 17 and the retainer 15 and urges the hook in a direction to separate from the inner peripheral teeth 181. 24 and a hole 19 which is rotatably opposed to the hook 17 and engages with a pin 171 projecting from the hook.
Flywheel 20 formed with
The flywheel 20 includes a flywheel gear 22 that is fitted around the outer peripheral edge of the flywheel 0 and cannot be detached by a ring pin 21, and a cap that locks the flywheel 20 to the winding shaft 8 so that the flywheel 20 cannot be detached.

The groove 1 formed on the lock ring 18 is rotated by the rotation of the lock ring 18 (lock instruction).
82 presses and slides the pin 141 engaged with it (see FIG. 9). As a result, the rotating claw 14 integral with the pin 141 is interlocked, the rotating claw 14 is locked to the ratchet 13, and the webbing pull-out rotation r1 of the winding shaft 8 is stopped (locked).

The acceleration sensor 12 is shown in FIGS.
As shown in FIG. 7, the base 121 is fitted into the engagement hole 704 of the rear wall 703 from the inside, a pair of arm frames 122 extending from the base 121, and the arm frame 122 is swingable via the pin N. A weight base 123 to be connected, a weight 124 placed on the upper surface f of the weight base 123, and a weight base 123
And a pair of support pieces 125 projecting from the ends of the pair of support pieces 125, and the pair of support pieces 125 are rotatably pin-connected to each other.
And a lever 126 that contacts the upper surface.

Here, as shown in FIGS. 5 and 6, a pair of pin portions N for connecting the weight base 123 to the arm frame 122 with pins are formed so that the center line L thereof is directed in the vehicle width direction Y. Therefore, the weight table 123 can swing in the front-rear direction X as seen from the arrow in FIG. The bottom wall g of the weight base 123 is formed as a flat surface parallel to the upper surface f, and the support surface h of the direction regulating portion 26 comes into contact with the lower surface g from below.

Here, the ELR function of the retractor 1 will be described with reference to FIG. 2, FIG. 8, and FIG. In the normal state, the take-up shaft 8 performs the take-out rotation r1 and the take-up rotation r2 of the webbing 4, and the retainer 15, the hook 17, the flywheel 20, and the flywheel gear 2 are integrated with the take-up shaft 8.
2 rotates.

Here, if the webbing 4 is rapidly pulled out and the drawing rotation r1 is accelerated, a rotation delay occurs on the flywheel 20 side, and the hole 19 of the flywheel 20 pushes the hook 17 via the pin 171 against the urging force of the spring 24. And the inner peripheral teeth 181
To be engaged. As a result, the rotation of the winding shaft 8 is applied to the lock ring 18 via the retainer 15 and the hook 17, and the lock ring 18 is rotated, and the guide groove 182 of the lock ring 18 is rotated via the pin 141 engaged with the lock ring 18. Moving claw 14
1 rotates around the shaft pin 30 and meshes with the ratchet 13 to stop the rotation of the winding shaft 8 and prevent the webbing 4 from being pulled out.

Similarly, when the lever 126 of the acceleration sensor 111 engages with the flywheel gear 22 during rapid deceleration,
The flywheel 20 and the flywheel gear 22 stop rotating, and the hook 17 is
To the lock ring 1
8 rotates, the rotating pawl 141 engages with the ratchet 13, and operates to prevent the webbing 4 from being pulled out. It is assumed that the above-described retractor 1 is mounted on a vehicle. Prior to this, the bracket 3 is welded to the side sill A so that its center line L1 is a vertical line.

The connecting portion d of the retractor is placed on the connecting portion C of the bracket 3, and at the same time, the bottom wall g of the weight table 123 abuts against the support surface h of the direction regulating portion 26, and a bolt (not shown) e, bracket 3
Assume that the retractor 1 is integrally connected to the vehicle. In this case, as shown in FIG. 4, the rear wall 703 of the retractor 1 on the side of the base frame 7 is mounted to be inclined by θ1 in the front-rear direction X, but the upper surface f of the weight base 123 is supported by the horizontal support surface h. To rotate about the center line L (see FIG. 5) and held in a horizontal state.

As a result, the weight 125 of the acceleration sensor 111 is placed on the horizontal upper surface f, and the acceleration sensor 111
When the vehicle is suddenly decelerated, the weight 125 can be properly tilted and actuated, and when the vehicle is suddenly decelerated, the ELR function can be properly exhibited, and the occupant can be held on the passenger seat S2 with good responsiveness. As described above, if the inclination of the support surface h of the direction regulating unit 26 is adjusted so that the upper surface f of the weight base 123 can be held horizontally,
When the base frame 7 is integrally connected to the connecting portion C, the support surface h rotates around the pins extending the weight base 123 in the vehicle width direction Y, and the weight base can be held horizontally.

In the webbing retractor shown in FIG. 1, the upper surface f of the weight table 123 is held horizontally. However, the upper surface f may be positively inclined by a predetermined amount. That is, the inclination angle of the upper surface f of the weight table 123 is set in advance depending on how much deceleration occurs in the vehicle when the winding device is locked, and the upper surface f is set to the set angle.
May be held in an inclined state, whereby a function of adjusting the lock timing can be provided. Here, the case where the retractor 1 used for each seat belt device of the left and right seats is shared will be described.

In this case, as described with reference to FIG. 13, the inclination of the base frame 107 of each of the left and right retractors 101 and 101a differs from θ1 and θ2 on the left and right, and the weight base 112 of the acceleration sensors 111 and 111a mounted here Therefore, the left and right acceleration sensors originally required different ones. However, in the webbing take-up device of the present invention, the left and right acceleration sensors 12 are the same,
The support surfaces h of the direction regulating portions 26 formed on the left and right brackets 3 are separately formed. That is, when the retractor 1 is coupled to the left and right brackets 3, the support surfaces h of the left and right direction regulating portions 26 are held such that the upper surfaces f of the weight bases 123 of the left and right acceleration sensors 12 are held horizontally. The inclination is adjusted and formed.

Thus, when the retractor 1 is integrally connected to the left and right brackets 3, each of the left and right acceleration sensors 1
The support surface h of the direction regulating portion 26 abuts on the second weight base 123, and the upper surface f of the weight base 123 can be held horizontally. For this reason, according to the webbing take-up device of the present invention, even if the retractor 1 is the same including the acceleration sensor 111, if only the support surface h of the direction regulating portions 26 of the left and right brackets 3 is adjusted, The retractor used in the left and right seat belt devices of the vehicle, specifically, the retractor used in the driver's seat-side seat belt device and the retractor used in the passenger's seat-side seat belt device can be shared, and in this regard, the cost can be reduced.

In particular, in this case, since the acceleration sensor 111 is shared and the first part number is adopted, parts management is simplified, and the cost can be reduced in this respect as well. In the webbing retractor of FIG. 1, the case where the retractor for the driver's seat and the retractor for the passenger's seat are shared has been described. Instead, the above description is applied to the seats in the second and subsequent rows of the vehicle. The structure may be applied, and the retractors may be shared by the left and right seats in the second and subsequent rows. Further, if the above-described structure is applied to each of the driver seat retractor, the passenger seat retractor, and the left and right seats in the second and subsequent rows, all the retractors can be shared.

In the above description, the retractor 1 as the webbing take-up device is connected to the side sill A via the bracket 3, but instead of this, the side sill A
A connecting portion (not shown) and a direction regulating portion (not shown) are directly formed on the vertical wall surface of the device, and a supporting surface capable of horizontally holding the upper surface of the weight table is formed on the direction regulating portion in the same manner as described above. Then, the retractor may be placed directly on the connecting portion (not shown), tightened and integrally connected with an anchor bolt (not shown), and simultaneously hold the upper surface of the weight table horizontally. Also in this case, FIG.
The same operation and effect as those of the apparatus described above can be obtained.

[0032]

As described above, according to the first aspect of the present invention, when the base frame is integrally connected to the connecting portion, the inclination of the support surface of the direction restricting portion is held so that the upper surface of the weight table can be held horizontally. If the support surface is set and formed to have the same inclination, when the base frame is integrally connected to the connecting portion, the support surface of the direction regulating portion abuts the weight base and extends the weight base in the vehicle width direction. By rotating around the pin, the weight table can be held horizontally.
Therefore, no matter what inclination the base frame is connected to the connection part, if only the inclination of the support surface of the direction regulating part is adjusted in advance so that the upper surface of the weight table can be held horizontally, the same An acceleration sensor can be used, and cost can be reduced. In addition, the number of parts can be reduced, so that the assembling workability is improved, the parts management can be simplified, and the cost can be reduced in this respect as well.

According to the second aspect of the present invention, particularly, since the connecting portion and the direction restricting portion are formed on the single-piece bracket, the connecting portion and the direction restricting portion can be easily manufactured, which is advantageous in cost.

[Brief description of the drawings]

FIG. 1 is a side view of a webbing take-up device to which the present invention is applied.

FIG. 2 is an exploded perspective view of a main part of the webbing retractor of FIG.

FIG. 3 is an enlarged perspective view of a bracket used by the webbing retractor of FIG. 1;

FIG. 4 is a functional explanatory view when the webbing retractor of FIG. 1 is connected to a bracket.

FIG. 5 is an enlarged front view of an acceleration sensor used by the webbing retractor of FIG. 1;

FIG. 6 is an enlarged plan view of an acceleration sensor used by the webbing retractor of FIG. 1;

FIG. 7 is an enlarged side view of an acceleration sensor used by the webbing take-up device in FIG. 1;

FIG. 8 is a cutaway side view of the ELR section of the webbing take-up device of FIG. 1 in a normal state.

9 is a cutaway side view of the webbing retractor of FIG. 1 when the ELR section is locked.

FIG. 10 is a schematic perspective view of a conventional seat belt device.

11A and 11B are explanatory diagrams of functions of an acceleration sensor used in the webbing take-up device, wherein FIG. 11A shows a steady state, and FIG.

FIG. 12 is an exploded side view of a conventional seat belt device.

FIGS. 13A and 13B are schematic side views of a conventional seat belt device, wherein FIG. 13A is a passenger seat side and FIG. 13B is a driver seat side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Retractor 4 Webbing 7 Base frame 8 Winding axis 12 Acceleration sensor 122 Arm part 123 Weight stand 124 Weight 126 Lever 701 Main wall 702 Front wall 703 Front and rear wall 26 Direction regulation part f Top surface h Support surface r1 Webbing pull-out rotation C coupling part X Front-rear direction Y Vehicle width direction N Pin R1 Lock means R2 Lock instruction means

Continuation of the front page (56) References JP-A-8-80807 (JP, A) JP-A-52-39222 (JP, A) JP-A-55-94267 (JP, A) JP-A-5-71065 (JP, A) , U) Fully open 61-119859 (JP, U) Fully open 3-121058 (JP, U) Fully open 1980-55,446 (JP, U) Fully open 1980-66026 (JP, U) Fully open 2-111756 (JP, U) Japanese Utility Model 63-114867 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60R 22/36-22/40 B60R 22/34

Claims (2)

(57) [Claims] 1. A base frame integrally connected to a connecting portion on a vehicle body side, a winding shaft pivotally supported in the base frame to wind up webbing for restraining an occupant, and a webbing withdrawal rotation of the winding shaft. Locking means for stopping the vehicle, an acceleration sensor having a weight that tilts in response to sudden deceleration of the vehicle and a lever that is linked to the weight,
Lock instruction means for permitting the rotation of the winding shaft at normal times and instructing the lock means to lock in response to the displacement of the lever at the time of rapid deceleration of the vehicle. In a webbing take-up device for stopping webbing pull-out rotation of a take-up shaft, a weight table on which the weight is placed is pivotally supported on the base frame side via a pin extending in a vehicle width direction, and a direction regulation provided on a vehicle body side is provided. A webbing take-up device, wherein a support surface is formed at the portion for holding an upper surface of the weight table at a predetermined angle when a base frame is integrally connected to the connection portion. 2. The webbing take-up device according to claim 1, wherein the connecting portion is formed on a bracket integrally connected to the vehicle body.