JPH0537879Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a webbing drive device for a seat belt device that drives an occupant restraining webbing via a wire and automatically attaches or detaches the webbing to the occupant.

[Prior Art] As an automatic seatbelt device that automatically attaches webbing to an occupant after the occupant gets in the vehicle, a seatbelt device that drives the webbing in the longitudinal direction of the vehicle by a webbing drive device to attach or release the webbing to the occupant. There is.

Some webbing drive devices are configured to drive webbing in the longitudinal direction of a vehicle via a wire. This type of webbing drive device is provided with a drum and a screw plate supported movably in the drum axis direction by screw means and to which a wire is locked, and the drum and screw plate are rotated to drive the webbing to the drum. The wire is wound spirally and the movement of the wire wound around the drum in the direction of the drum axis is restricted by the sheet and screw plate, and the drum and screw plate are rotated to unwind the wire from the drum and the webbing is moved in the longitudinal direction of the vehicle. It is now being driven by

However, in conventional webbing drive devices of this type, the wire is wound around the drum in a spiral manner, whereas the sheet is flat, and the wire is inclined in the circumferential direction of the drum with respect to the sheet. The distance between the wire and the sheet was partially too large or too small in the circumferential direction of the drum. Furthermore, although the wire is wound around the drum in a spiral, the screw plate is also flat, making it impossible to maintain a constant distance between the wire and the sheet. If the gap between the wire and the sheet is too large, the wire will dance during unwinding, causing abnormal noise; if it is too small, the wire will twist between the wire and the sheet when unwinding, causing the wire to move in the circumferential direction of the drum. It is preferable to set it to a constant and appropriate size.

[Problems to be solved by the invention] Taking the above facts into consideration, the purpose of the invention is to obtain a webbing drive device for a seat belt device that can maintain a constant distance between the wire and the seat in the circumferential direction of the drum. .

[Means for Solving the Problems] The present invention includes a cover that is a cylindrical body with a bottom wall at one end and includes a screw means protruding inwardly from the bottom wall, and a cover that includes a screw means inside the cover. a drum that is rotatably provided on the same axis as the means; and a drum that is provided at one end of the drum in the axial direction and engaged with the drum, that is threadedly engaged with the screw means and moves along the axial direction of the screw means. a screw plate having one end connected to the occupant restraining webbing and having the other end locked; and a screw plate provided within the cover at the other end in the axial direction of the drum and fixed to the vehicle body. a sheet, and driving the webbing by rotating a screw plate together with the drum and moving the screw plate along the axial direction of the screw means, by winding or unwinding a wire around the drum in a spiral manner. , a webbing drive device for a seat belt device for attaching or unattaching webbing to an occupant, in which inclined surfaces are formed in parallel to the direction in which the wire is wound around the drum at the portions of the seat and the screw plate that correspond to the wires, respectively. It is characterized by

[Function] In the present invention having the above configuration, the drum is rotatably provided on the same axis as the screw means within the cover provided with the screw means, and the screw means is engaged with the drum at one end in the axial direction of the drum. A screw plate is screwed onto the drum, and a seat is provided within the cover on the other end of the drum in the axial direction and is fixed to the vehicle body.When the screw plate rotates together with the drum, the screw plate responds to this rotation. Accordingly, the screw means moves along the axial direction of the screw means. As a result of this movement, the wire that is locked to the screw plate is
It is spirally wound or unwound around the area between the screw plate and the sheet of the drum. As a result, the webbing is driven, and the webbing is attached to or removed from the occupant.

In the present invention, in the webbing drive device for a seat belt device having the above configuration, slopes are formed in the corresponding parts of the seat and the screw plate to the wires, respectively, in parallel to the direction in which the wires are wound around the drum. It will be wound onto the drum parallel to the surface. Therefore, the distance between the wire and the sheet and the distance between the wire and the screw plate are kept constant in the circumferential direction of the drum, and the distance between the wire and the sheet is kept constant in the circumferential direction of the drum.

[Embodiment] FIG. 3 shows a seat belt device using a webbing drive device 10 according to an embodiment of the present invention.

In this seat belt device, a webbing 14 is attached to an occupant 12 seated on a seat 11. One end of this webbing 14 is wound up on a winding device 18 attached to the approximate center of the vehicle. The take-up device 18 has a built-in inertia lock mechanism that stops pulling out the webbing 14 when the vehicle decelerates.

Webbing 14 pulled out from take-up device 18
A slider 20 is attached to the tip. The slider 20 is moved while being guided by a guide rail 24 that is laid in the longitudinal direction of the vehicle along the roof side rail 22 of the vehicle. One end of a wire 28 (shown in FIG. 1) is connected to this slider 20.
is moved in the longitudinal direction of the vehicle along the guide rail 24 via a wire 28 by a webbing drive device 10 provided at an intermediate portion of the center pillar 26. When the slider 20 is positioned at the vehicle rear end of the guide rail 24, the webbing 14 is attached to the occupant 12 as shown by the solid line in FIG. 3, and extends to the front end of the guide rail 24 as shown by the imaginary line. In the hanging state, the webbing 14 is released from the occupant 12. Note that between the slider 20 and the webbing drive device 10, the wire 28 is tightly housed in a tube 29 disposed between the end of the guide rail 24 and the webbing drive device 10, and is movable in the longitudinal direction. ing.

The webbing driving device 10 is provided with a base plate 30 as shown in FIG. Three leg plates 30A are bent at the peripheral edge of the base plate 30, and the tips of the leg plates 30A are fixed to the center pillar 26 with bolts 31.

A gear box 32 is attached to approximately the center of one side of the base plate 30 via a rivet 34 and is disposed between the base plate 30 and the center pillar 26. Gearbox 32 has the first
As shown in the figure, a motor 36 is attached and a rotating shaft 42 is rotatably erected.

The motor 36 is connected to a switch (not shown) that detects the movement of the occupant 12 to get on or off the vehicle, and is activated when the occupant 12 gets on or off the vehicle. This motor 36
As shown in FIG. 2, a worm gear 38 is coaxially attached to the output shaft 36A, and a rotating shaft 42 can be rotated via the worm gear 38 and a worm wheel 40 that meshes with the worm gear 38.

The rotating shaft 42 has a bottomed engagement hole 44 with a hexagonal cross section formed at the tip thereof, and is used as a hexagonal wrench 4 for rotational operation.
5 (shown in FIG. 1), and can be manually rotated by inserting a hexagonal wrench 45 into the engagement hole 44 if necessary. The rotating shaft 42 passes through the base plate 30 and has a distal end protruding from the base plate 30 toward the center of the vehicle interior.

On the other hand, the gearbox 32 of the base plate 30
A cover 48 is attached to the opposite side via screws 46, and is housed in this cover 48 so that the seat 50 and the inner drum 5 can be connected from the base plate 30 side.
2. Screw plate 54, outer drum 56
are being installed in sequence.

The cover 48 is integrally protruded with a groove-shaped protrusion 59 forming a wire passage recess 58, as shown in FIG. Further, from the cover 48, as shown in FIG.
are extended coaxially and integrally. Hollow shaft part 60
A large-pitch male thread 62 is cut on the outer periphery for screwing into the screw plate 54.
The male thread 62 is made of synthetic resin and is integrally molded with the cover 48, so that the threads do not vary in the circumferential direction. That is, the hollow shaft portion 60
If the hollow shaft portion 60 is fixed to the cover 48 by caulking or the like after the male screw 62 is manufactured separately from the cover 48, the hollow shaft portion 60 and the cover 48
The mounting position around the axis is not constant. In this embodiment, since the hollow shaft part 60 is integrally formed with the cover 48, the mounting position of the hollow shaft part 60 around the axis is constant, and the mounting between the hollow shaft part 60 and the cover 48 is strong. .

The hollow shaft portion 60 accommodates the tip of the rotating shaft 42 therein, and exposes the engagement hole 44 to the outside of the cover. The hollow portion of the hollow shaft portion 60 is sized so that a hexagonal wrench 45 can be inserted therein, and the rotary shaft 42 can be manually rotated from the outside of the cover 48 using the hexagonal wrench 45 (shown in FIG. 1).

The outer periphery near the tip of the rotating shaft 42 is a hollow shaft portion 60.
It is in contact with the inner peripheral surface of, or is slightly separated from,
When rotating the rotating shaft 42 using the hexagonal wrench 45, the outer periphery of the rotating shaft 42 is supported by the inner periphery of the hollow shaft portion 60.

The inner drum 52 has a disc shape, and has protruding portions 52A having substantially fan-shaped cross sections protruding in the axial direction at three locations around the axis at substantially equal intervals. The envelope diameters of these protrusions 52A are tapered to become slightly smaller toward the tips of the protrusions 52A. This inner drum 5
2 has a rectangular hole 72 formed in the shaft center, and a driving portion 42A having a rectangular cross section formed in the middle part of the rotating shaft 42 is fitted into this rectangular hole 72, and the rotating shaft 42 is rotated. It is designed to be rotated.

The screw plate 54 is disc-shaped, and has three fan-shaped holes 74 formed at equal intervals around the axis, and the protrusion 52A of the inner drum 52 is fitted into the holes 74, so that it can rotate together with the inner drum 52. It is said that A wire 28 is attached to the screw plate 54 by a rivet 82 via a clamp 80 on the peripheral edge.
The end portion of the cover 48 is locked, and a female thread 78 is cut in the shaft center portion to be screwed into the hollow shaft portion 60 of the cover 48 . Therefore, this screw plate 5
4 is rotated by the rotation of the rotating shaft 42 and moves in the axial direction so that the wire 28 can be wound helically around the outer periphery of the inner drum 52. The wire 28 is wound around the outer periphery of the inner drum 52 once every time the rotating shaft 42 rotates once, and the screw plate 54 also moves in the axial direction by the diameter of the wire 28 to wrap the wire 28 around the outer periphery of the inner drum 52.
8 is tightly wound around the outer periphery of the inner drum 52.

In this screw plate 54, the peripheral edge portion is inclined at a constant angle in the circumferential direction over approximately the entire circumference excluding the wire locking portion, and the lower surface thereof is an inclined surface 54C extending approximately around the circumference excluding the wire locking portion. There is. Slope 5
4C is provided so as to be parallel to the winding direction of the wire 28 which is spirally wound around the outer periphery of the inner drum 52. That is, the inner drum 52
Wire 2 wound spirally multiple times around the outer circumference of
8 is inclined with the tangent line of the inner drum 52 (angle θ in Fig. 1), and the inclined surface 54C is inclined correspondingly to this angle, and the wire 28 is parallel to the inclined surface 54C toward the outer periphery of the inner drum 52. It will be wrapped around.

Further, in this screw plate 54, the female screw 78 is molded integrally with the screw plate 54 from synthetic resin, so that the screw threads do not vary in the circumferential direction. Therefore, since the male thread 62 of the hollow shaft portion 60 that is screwed into the female thread 78 of the screw plate 54 is designed so that the threads do not vary in the circumferential direction, the wire 28 can be easily connected to the outer periphery of the inner drum 52. It is designed so that it can be wound from a fixed position in the axial direction of the inner drum 52.

The outer drum 56 is attached to the inner drum 52 via screws 83 and is rotatable together with the inner drum 52. This outer drum 56
The screw plate 54 and the inner drum 52 are housed inwardly, and a wire accommodating space is provided between the screw plate 54 and the inner drum 52 to limit the movement of the wire 28 wound around the inner drum 52 in the radial direction of the inner drum. It's getting old. Note that the outer drum 56 is connected to the cover 48 via a bush 84.
The cover 48 is in sliding contact with the inner wall of the cover 48 so as not to come into direct contact with the cover 48.

The sheet 50 has a peripheral edge sandwiched between the cover 48 and the base plate 30 .
and the inner drum 52 to restrict movement of the wire 28 wound around the inner drum 52 toward the base plate 30 side.

A block 50B projects tangentially from the peripheral wall 50A of the seat 50, and a wire insertion hole 68 is passed through the block 50B. For this reason,
The wire 28 passes through the insertion hole 68 into the sheet 50.
I am becoming guided within. This sheet 50
The wire 28 that has reached the inside moves in the axial direction of the rotating shaft 42 along the inclined surface 50C of approximately 3/4 circumference formed on the sheet 50, and is wound around the outer periphery of the inner drum 52 while drawing a spiral trajectory. It's becoming like that. The inclined surface 50C is provided so as to be parallel to the direction in which the wire 28 is wound helically around the outer periphery of the inner drum 52. That is, the inclined surface 50 corresponds to the inclination (angle θ in FIG. 1) of the tangent line between the axis of the wire 28 wound around the outer circumference of the inner drum 52 in a plurality of spirals and the inner drum 52.
C is inclined, and the wire 28 is inclined on the inclined surface 50C.
It will be wound around the outer periphery of the inner drum 52 in parallel with.

As described above, the wire 28 wound around the outer periphery of the inner drum 52 does not change its winding diameter to the protrusion 52A, and is held between the screw plate 54 and this sheet 50, so the rotating shaft 4
When the inner drum 5 is rotated in the wire extrusion direction (direction of arrow A in FIG. 1), it receives an axial compressive force and the inner drum 5
2 and pushed out through the wire passage hole 68.

Next, the operation of this embodiment will be explained.

When the occupant 12 is not seated on the seat 11, the slider 20 is positioned at the vehicle front end of the guide rail 24, and the webbing 14 is in the state shown in phantom lines in FIG.

Therefore, the occupant 12 can easily sit on the seat 11 and get on the vehicle. When the occupant 12 is seated on the seat 11, a switch (not shown) detects this and the motor 36 rotates the rotating shaft 42 in the direction of winding the wire 28 around the inner drum 52.
8 is spirally wound around the inner drum 52. As a result, the slider 20 is moved toward the rear of the vehicle along the guide rail 24 via the wire 28, and the webbing 14 is automatically attached to the occupant 12 as shown by the solid line in FIG.

When the vehicle decelerates, the take-up device 18 removes the webbing 14.
In order to stop the drawer from being pulled out, the occupant 12 is securely restrained by the webbing 14.

When the occupant 12 exits the vehicle, a switch (not shown) detects this and the motor 36 rotates the rotating shaft 42 in the direction to unwind the wire 28 from the inner drum 52.
is rotated, and the wire 28 is unwound from the inner drum 52.

As a result, the slider 2 is connected via the wire 28.
0 is moved toward the front of the vehicle along the guide rail 24, and the webbing 14 is automatically removed from the occupant 12.

If the motor 36 cannot be operated due to inadvertently being disconnected from the vehicle power supply, insert the hex wrench 45 from the outside of the cover 48 through the hollow part of the hollow shaft part 60 into the bottomed hole 44 of the rotating shaft 42. When it rotates, the rotating shaft 42 is rotated and the webbing 14 is moved. Each time the rotating shaft 42 is rotated once, the wire 28 is wound or unwound around the outer periphery of the inner drum 52, so the webbing 14 can be quickly moved by rotating the hexagonal wrench 45.

In this case, since the tip of the rotating shaft 42 is housed in the hollow shaft 60, the bending strength of the hollow shaft 60 is increased by the rotating shaft 42, and the reliability of the hollow shaft 60 is high.

Note that it is of course possible to use other jigs instead of the hexagonal wrench 45.

In this way, the webbing 14 is driven and the passenger 1
In the webbing driving device 10 that attaches or detaches the webbing 14 to the screw plate 54 and the cover 48, the male screw 78 of the screw plate 54 and the male screw 62 of the hollow shaft portion 60 that is screwed thereto are made of synthetic resin. Since the wire 28 is integrally formed and can be wound around the outer circumference of the inner drum 52 from a fixed position in the axial direction of the inner drum 52, the inner drum 5
The device for winding the wire 28 around the inner drum 52
There is no variation in the axial direction. Therefore, there is no variation in the distance between the wire 28 and the sheet 50 when the wire 28 is wound around the inner drum 52, and the distance between the wire 28 and the sheet 50 can be reliably set to a predetermined size. It is possible to prevent the wire 28 from dancing during wire unwinding and causing abnormal noise, or from causing strain between the wire 28 and the sheet 50.

In addition, the sheet 50 and the screw plate 54
Since the wire 28 is wound around the inner drum 52 parallel to the inclined surfaces 50C and 54A, the sheet 50 and the wire 28 are wound around the inner drum 52 in parallel with the inclined surfaces 50C and 54A. The distance between the sheet 50 and the wire 28 and the distance between the screw plate 54 and the wire 28 are kept constant in the circumferential direction of the drum, and the distance between the sheet 50 and the wire 28 is kept constant in the circumferential direction of the drum.
For this reason, the distance between the sheet 50 and the wire 28 when the wire 28 is wound around the inner drum 52 is set to a predetermined size, and the wire 28 is
It is possible to prevent the wires 28 from dancing and making abnormal noises, and from causing strain between the wire 28 and the sheet 50.

Also, the gearbox 3 is attached to the base plate 30.
2. Various parts such as the motor 36 and the inner drum 52 are assembled and attached to the center pillar 26 with bolts 31 via the base plate 30, so when changing the mounting position to the car body depending on the car model etc. Even in this case, the base plate 30 can be attached to the vehicle body simply by replacing the base plate 30 with a base plate that is a separate part in which the number, shape, length, bending angle, etc. of the leg parts 30A are changed, and a large number of parts can be shared.

[Effects of the invention] As explained above, the present invention includes a cover provided with a screw means, a drum rotatably provided within the cover on the same axis as the screw means, and a drum engaged with the drum at one end in the axial direction of the drum. a screw plate which is screwed onto the screw means and movably supported along the axial direction of the screw means, and has one end connected to the occupant restraint webbing and the other end of which is locked; and a seat provided on the other end of the drum in the axial direction within the cover and fixed to the vehicle body, and the screw plate is rotated together with the drum to move the screw plate along the axial direction of the screw means. This is a webbing drive device for a seatbelt device that drives the webbing by spirally winding or unwinding a wire to attach or unattach the webbing to an occupant. Since the inclined surface is formed parallel to the direction in which the wire is wound around the drum, an excellent effect is obtained in that the distance between the wire and the sheet can be kept constant in the circumferential direction of the drum.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a webbing drive device to which the present invention is applied, Fig. 2 is a sectional view showing the assembled state of Fig. 1, and Fig. 3 is a seat using the webbing drive device of Fig. 1. FIG. 3 is a side view of the belt device seen from the side of the vehicle. 10... Webbing drive device, 12... Crew member,
14...Webbing, 28...Wire, 48...
Cover, 50... Sheet, 50C... Inclined surface, inner drum (drum), 54... Screw plate, 54A... Inclined surface, 62... Male thread (screw means).

Claims (1)

[Scope of utility model registration request] a cover that is a cylindrical body with a bottom wall at one end and includes screw means protruding inward from the bottom wall; a drum rotatably provided within the cover on the same axis as the screw means; A screw is provided at one end of the drum in the axial direction so as to be engaged with the drum, is screwed onto the screw means, is supported movably along the axial direction of the screw means, and has one end connected to the occupant restraining webbing. a screw plate to which the other end of the wire is fixed, and a seat provided within the cover at the other end of the drum in the axial direction and fixed to the vehicle body, and the screw plate is rotated together with the drum. A seat belt device for driving the webbing by spirally winding or unwinding the wire around the drum while moving the screw plate along the axial direction of the screw means, and for attaching or unattaching the webbing to an occupant. What is claimed is: 1. A webbing drive device for a seat belt device, characterized in that slopes are formed in parallel to the direction in which the wire is wound around the drum at the portions of the seat and the screw plate that correspond to the wires, respectively.