JPS5850926Y2 - Occupant restraint belt winding device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an occupant restraint belt winding device for winding an occupant restraint belt for restraining an occupant in a vehicle emergency.

The occupant restraint belt winding device instantly stops the unwinding rotation of the occupant restraint belt in the event of a vehicle emergency such as a collision, thereby restraining the occupant and ensuring safety.

Vehicles equipped with a so-called vehicle emergency stop mechanism are widely used.

In general, in the event of a vehicle emergency, a metal lock bar that is swung by a sensor engages with a lock gear that has ratchet teeth fixed to the winding shaft, thereby stopping the unwinding rotation of the winding shaft. .

However, in such a winding device, the metal lock bar is supported by a substantially triangular frame hole provided in the frame that supports the winding shaft and is swingable; A considerable amount of slack is provided in the frame hole for support.

As a result, the center of rotation of the lock bar becomes unstable, and in the event of a vehicle emergency, the time required for the tip of the lock bar to come into contact with the tip of the lock gear becomes irregular, making operation unreliable.

Further, since the lock bar is always supported in contact with the frame, metal contact between the lock bar and the frame hole generates abnormal noise, which causes discomfort to vehicle occupants.

In order to eliminate the above-mentioned drawbacks, an object of the present invention is to provide an occupant restraint belt retractor that can stabilize its operation and further prevent the generation of abnormal noises.

In order to achieve this object, the occupant restraint belt retractor according to the present invention includes a frame, a take-up shaft rotatably supported by the frame, and a take-up shaft fixed to the take-up shaft. A metal lock gear that rotates integrally, a resin sub-lock bar that is swingably supported by the frame, and a sub-lock bar that is fixed to the frame and swings in the direction of the winding shaft by inertia force. a sensor that is integrally fixed to the sub-lock bar, is swung coaxially with the sub-lock bar so as to be able to mesh with the lock gear, and is freely disposed in a frame hole drilled in the frame; and a metal lock bar, which maintains a constant rocking trajectory of the lock bar, and directly supports this lock bar with the frame to unwind only when a large unwinding rotational force is applied. The resin is designed to support the rotational force, and when the unwinding rotational force is not applied, the resins are brought into contact with each other.

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3, the occupant restraint belt retractor according to the present invention is composed of a frame 10, a retractor shaft 20, a lock gear 30, a guide gear 40, a sub-lock par 50, a lock par 60, and a sensor 70.

The frame 10 is made of a thin plate material and has legs 11 at both ends.
It is formed into a substantially U-shape with A, 11 and B, and a vehicle body attachment part 12 is continuous from the center part.

These legs 11AjlB have holes 13A and 13B for mounting the winding shaft approximately at the center, and locking holes 6 near the holes 13A and 13B for mounting the winding shaft.
0 retention frame hole 14A formed in a substantially triangular shape,
14B, and near the top of this frame hole, shaft supporting holes 15A and 15B for the sub-lock par 50 are formed coaxially, respectively.

Further, the sensor 70 is attached to the foot portion 11A through the opening 16.
Holes 17A and 17B are formed in the foot portion 11B for attaching the mainspring spring, and a reinforcing plate 18 is hung between the foot portions 11A and 11B. Reinforced.

The winding shaft 20 is formed into a substantially cylindrical shape, and a lock gear 30 having a ratchet tooth surface is fixed to one end thereof.

Further, this winding shaft 20 is connected to the holes 13A and 1 of the frame 10.
3B, the end of the occupant restraint belt is attached to the mounting shaft 21 through the sling 22 provided in the center. It is designed to be wrapped around and locked.

Further, the yoke 2 protrudes from the foot 11B of the mounting shaft 21.
3, one end of a mainspring spring (not shown) is locked, and the other end of this mainspring spring is inserted into the holes 17A and 17B into the foot portion 11B.
The winding shaft 20 is biased in the winding direction of the occupant restraint belt by being locked to a spring cover 24 attached through the winding shaft 24 .

The sub-locker 50 is made of resin and is covered with a metal lockper 60 as shown in FIGS. 4 to 6.

As a result, in the lock par 60, only the claw portions 63 extending in a direction perpendicular to the longitudinal direction of the lock par 60 near both ends 61, 62 and the end 62 protrude to the outside of the sub lock par 50.

The claw portion 63 has an inclined surface at the tip, and the lock gear 30
It is said that it is possible to mesh with.

Further, boss portions 52A and 52B for frame attachment are formed on the sub-lock par 50, and these boss portions 52
Coaxial mounting holes 53A, 53B are drilled in A, 52B, and the legs 11A, 11B of the frame 10 are provided with coaxial mounting holes 53A, 53B.
Mounting pins 54- fixed to holes 15A and 15B in
3 By capping the mounting holes 53 A and 53 B, the sub lock par 50 and the lock par 60 are attached to the frame 1.
It is pivoted to 0.

Also, due to this pivot support, both ends 61 and 62 of the locking member 60 are located in the frame holes 14A and 14B in the frame 10, respectively, and are able to swing freely within the frame holes 14A and 14B about the pin 54. Normally, it does not come into contact with the inner peripheral surfaces of the frame holes 14A, 14B.

In the figure, the cylindrical part with the inclined top surface protruding from the sub-lock par 50 is the receiving part 55 of the sensor 70.

The sensor 70 is mounted on a bracket 71. The bracket 71 is made up of a pin 72 and a weight 73, and the bracket 71 has a hole 74 for passing the pin through, and mounting holes 75A and 75B for attaching the foot portion 11A.

In this bracket 71, the screws 76A and 76B are connected to the foot portion 1.
It is fixed to the foot 11A by screwing into the holes 16A, 16B of 1A and the mounting holes 75A, 75B of the bracket 71, and after the pin 72 is passed through the hole 74, this pin 72 is fixed to the weight 73. ing.

As a result, the weight 73 detects vehicle acceleration and tilts, and when the weight 73 tilts, the upper end protrusion 77 of the pin 72 pushes up the receiving portion 55 of the sub-lock par 50.

Next, the operation of the occupant restraint belt retractor according to this embodiment will be explained with reference to FIGS. 7 to 11.

FIG. 7 shows the vehicle when it is stationary and when it is running normally, and the weight 73 is stationary with its axis vertical and only generates minute vibrations, so the sub lock par 50 and the lock par 60 are approximately horizontal. Both are maintained at the same position, separated from the lock gear 30, and not in contact with the inner circumferential surfaces of the frame holes 14A and 14B.

Next, when an acceleration of more than a predetermined value is applied to the vehicle, the weight 73 tilts as shown in FIG. The block par 50 is swung around the pin 54.

As a result, when the claw portion 63 enters the locus drawn by the tooth tip 31 of the lock gear 30 rotated in the winding direction, the tooth tip 31 of the lock gear 30 scoops up the claw portion 63 of the lock par 60 and As shown in FIG. 9, the lock par 60 is further swung to a position where the tooth tip 64 meshes with the tooth bottom 32 of the lock gear 30.

Even when the tooth tip 64 and the tooth bottom 32 engage with each other, the ends 61 and 62 of the lock par 60 are separated from the frame holes 14A and 14B due to the engagement between the claw portion 63 and the lock gear 30, and the winding shaft The unwinding direction rotational force of 20 is the sub-lock bar 5
0 mounting holes 53A, 53B and pin 54 to the foot portion 11A of the frame 10.

11 B.

In this case, the receiver portion 55 and the upper end protrusion 77 of the weight 73 are spaced apart.

Next, when the vehicle acceleration is reduced and the normal running state is restored, and the winding shaft 20 is slightly rotated in the winding direction of the occupant restraint belt, the sub lock bar 50 and the lock par 60 are moved in the direction opposite to the meshing direction due to their own weight. Needless to say, it is swung back to the state shown in FIG. 7.

Next, when an extremely large unwinding rotational force is applied to the winding shaft 20 due to a vehicle collision, etc., an extremely large compressive shearing force will be applied to the resin sub-lock bar 50 and the resin pin 54, and finally Then, the sub-lock bar 50 and the pin 54 are deformed or destroyed, and the metal lock bar 60 comes into contact with the frame holes 14A, 14B and is directly supported, as shown in FIG.

Therefore, the metal lock gear 30 is directly supported by the frame hole 14B on the leg portion 11B of the frame 10 via the metal lockper 60, and can extremely reliably support a large unwinding rotational force to protect the occupant. To ensure the safety of occupants by surely stopping the unwinding of restraint belts.

In addition, in this way, the lock par 60 is connected to the sub lock bar 5.
Since the sensor 70 has a simple and lightweight structure, a small force is sufficient for the actuation force of the sensor 70, that is, the force of the upper end protrusion 77 to push up the support part 55, and the operation of the occupant restraint belt retractor is sufficient. The sensor 70 can be made more sensitive to ensure the safety of the occupants, and the sensor 70 can be made smaller.

As explained above, in the occupant restraint belt retractor according to this invention, the lock bar and the sub-lock bar are fixed together, and during normal operation, they are supported by pins on the frame and swing. Therefore, when the lock bar and sub-lock bar are swung by the sensor, the swiveling locus of the lock bar remains constant, making it possible to stabilize the operation.

Furthermore, the lock bar is brought into contact with the frame hole formed in the frame foot only when an extremely large unwinding rotational force is applied, thereby preventing abnormal noises caused by metal-to-metal contact between the frame and lock bar. As a result, it is possible to obtain an occupant restraint belt retracting device that provides an extremely pleasant feeling.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the occupant restraint belt retractor according to the present invention, FIG. 5 is a plan view of FIG. 4, FIG. 6 is a right side view of FIG. 4, and FIGS. 7 to 10 are second views showing the operation of the present invention. It is a sectional view corresponding to the figure.

Claims (1)

[Scope of utility model registration request] a frame, a take-up shaft rotatably supported by the frame, a metal lock gear fixed to the take-up shaft and rotated integrally with the take-up shaft, and a metal lock gear rotatably supported by the frame. a resin sub-lock bar; a sensor fixed to the frame and swinging the sub-lock bar in the direction of the take-up shaft by inertia; and a sensor fixed integrally to the sub-lock bar and coaxial with the sub-lock bar. a metal lock bar that can be swung and engaged with the lock gear, and that is freely disposed in a frame hole drilled in the frame; An occupant restraint belt retractor characterized in that it is engaged with the frame hole only when a force is applied.