JPS6337334Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of the locking mechanism of a retractor for a vehicle seat belt, and aims to provide a structure that is smaller, lighter, and easier to assemble. It is.

When the seatbelt is tightened around the occupant's body, the webbing should be able to be extended and returned when the occupant moves, so that the occupant does not feel a strong pressure. This invention relates to an emergency lock type retractor in which an emergency lock mechanism operates to prevent the webbing being loaded into the retractor from being pulled out when a sudden strong force is applied to the occupant due to a tilt.

Below, referring to the drawings, holes for the spindle 2 are bored in both side walls of the housing 1, which has a U-shaped cross section, and the ratchet 3,
A spindle 2 is fitted with a cylinder 4 around which a webbing having 3' at both ends is fitted.

Therefore, one end of the spindle 2 is accommodated and attached to a spring case 7 attached to one side wall of the housing 1 via a spiral spring 6 so as to have a spring effect. An emergency locking mechanism housed in a mechanical cover 8 attached to the other side wall of the housing is installed at the other end, and the operation of the locking mechanism causes the pawl 10 to swing via the pawl lever 9, thereby locking the latches 3 and 3'. When engaged, rotation of the cylinder 4 and spindle 2 is locked.

The pawl 10 is integrally engaged with the pawl lever 9 and swingably extends over both side walls of the housing 1, and the pawl spring 11 is interposed between the guide pin 1a attached to the housing 1, and the operation of the lock mechanism is canceled. Occasionally, it is energized to maintain the state before activation.

In addition, 12 is a tie bar for reinforcing the housing, 13 is a guide roller for smoothing out and returning the webbing, and 14 is the guide roller shaft. Further, 15 is a garnish having a webbing opening 151.

A feature of the retractor of the present invention is an emergency lock mechanism, which consists of a
Sequentially towards the tip, a crown-shaped clutch 16 with internal teeth is pivotally attached to the E-ring 17 so as not to slip out, and then a window 201 is bored in the peripheral wall via a friction spring 18. A cup-shaped inertia mass 20 to which a locking ring 19 is frictionally coupled to the outer periphery is pivotally mounted, and a cam 21 is engaged at the most extreme position so as to rotate integrally with the spindle. A pin 202 is bored in the inner wall of the inertia mass 20,
A lock arm 22 having a claw 221 at the outer end is pivotally attached to the pin 202, and a sensor spring 23 is attached to the protrusion 203 on the inner wall of the inertia mass 20 and the protrusion 222 of the lock arm, so that the lock arm 22 is mounted inside the inertia mass 20. energized to be accommodated.

In addition, a sliding pin 22 provided on the side of the lock arm
3 makes the sliding hole 211 bored in the cam 21 slidable, and as the cam 21 swings, the sliding hole 211 slides on the sliding pin 223 and the lock arm 22 swings; The rocking of the cam 21 causes the lock arm 22 to protrude from the inertia mass window 201.
The structure is such that it accommodates

Therefore, when the claw 221 of the lock arm protrudes from the window 201 against the tensile force of the sensor spring 23, the claw 221
The clutch 16 is engaged with the internal teeth 161 of the clutch 16, which is installed so as to enclose the clutch 16, and the engaged clutch 16 becomes able to rotate the clutch spring 24 which is frictionally connected to the clutch at its outer periphery. As the clutch spring 24 rotates, a pawl 241 protruding from the clutch spring swings the pawl 10 via the pawl lever 9.

Furthermore, the sensor 25 is configured to engage and lock due to the operation of the acceleration sensing mechanism and the teeth 191 of the locking ring.

The sensors 25 of the acceleration sensing mechanism are located at the four corners.
Each includes a mechanical holder 251 with legs erected, a weight 252 mounted diagonally on each leg, and a mechanical shaft 253 spanning two adjacent legs.
The weight 252 held by each foot tilts due to a sudden impulse, and the mechanical lever 254, which is pivoted on the L-shaped mechanical lever 254, is
It acts on one end of the L-shape of the locking ring 54, and the other end engages with the teeth 191 of the locking ring 19.

Therefore, with the above configuration, when the occupant moves his or her body, the mainspring spring 6 is normally used.
The loaded webbing is pulled out and pulled back against the spring force by the spring action of the cylinder 4, the spindle 2, and the cam 21. Both will rotate rapidly. At this time, the inertia mass 20 cannot follow the rotation due to its inertia, and the lock arm 22 pivotally connected to the inertia mass 20 is swung by the cam 21 against the sensor spring 23. Therefore, when the lock arm 22 swings, the pawl 221 of the lock arm passes through the inertia mass window 201 and engages the internal tooth 1 of the clutch located outside.
61, and the clutch 16 rotates together with the spindle 2 via the cam 21 and the lock arm 22. When the clutch 16 rotates, the scratch spring 24, which is frictionally connected to the clutch 16, rotates.
The pawl 241 is connected to the pawl 1 via the pawl lever 9.
The rotation of the cylinder 4 and spindle 2 is locked by swinging the cylinder 4 and engaging the latches 3 and 3'.

Additionally, if there is sudden deceleration or the vehicle is tilted, the sensor 25 is activated by the impulse of the weight 252, and the mechanical lever 254 is activated by the locking ring 1.
9 is engaged. However, Locking Ring 19
is frictionally coupled to the inertia mass 20 and prevents the rotation of the inertia mass 20. Therefore, when the webbing is about to be pulled out, the rotation of the spindle 2 and the cam 21 and the rotation of the inertia mass 20 are prevented.
A relative difference occurs between the rotation of the lock arm 22 and the rotation of the lock arm 22, which causes the lock arm 22 to be swung by the cam 21. When the lock arm 22 swings, the pawl 221 is connected to the internal tooth 161 of the clutch, similar to when the webbing is suddenly pulled out due to an occupant jumping out.
, the clutch 16 rotates together with the spindle 2 via the cam 21 and the lock arm 22, the clutch spring 24 rotates, and the pawl lever 9
The pawl 10 is swung through the ratchet 3,
3', the cylinder 4 and the spindle 2
This locks the rotation of the

As described above, the inertia mass 20 has a cup-like shape, and in combination with this, the crown-shaped clutch 16 is arranged so as to cover the outside, so that the widthwise extension of these locking mechanisms is reduced and the size is reduced. Also, lock arm 22,
Since the sensor spring 23 and cam 21 can be attached from the outside, assembly is facilitated.

Furthermore, the clutch 16 and clutch spring 2
4 and locking ring 19 and inertia mass 2
Since the lock arm 22 is friction-coupled between the lock arm 22 and
In order for the ratchet to engage with the internal teeth 161 of the clutch 16, the number of internal teeth of the clutch must be increased, and the teeth of the ratchet must be made somewhat large to ensure reliable engagement with the pawl 10. ,but,
In order to downsize the retractor, it is essential to reduce the number of internal teeth 161 of the clutch.
If the number of teeth of the ratchets 3, 3' and the internal teeth 161 of the clutch are synchronized by friction coupling between them, the number of internal teeth of the clutch 16 can be reduced, resulting in miniaturization.

Also, for the same reason, there is also a gap between the locking ring 19 and the inertia mass 20, especially the mechanical lever 2.
54 engages with the locking ring 19, and then
Since the locking arm 22 is designed to engage the clutch 16, in order to shorten the operating time, the number of teeth on the locking ring 19 should be increased.
In order to enable the mechanical lever 254 to engage in a shorter time, and since the lock arm 22 that engages with the clutch 16 is supported by the cam 21, in order to strengthen the mechanical lever 254 that engages with the locking ring 19, a friction coupling is required. . As a result, miniaturization becomes possible.

Further, since the clutch 16, the lock arm 22, and the mechanical lever 254 are made of plastic, the clutch 16, the lock arm 22, and the mechanical lever 254 can be made of plastic, which has the advantage of reducing weight.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an emergency locking retractor according to the present invention, and FIG. 2 is a diagram showing its component configuration. 1...Housing, 1a...Guide pin, 2...
...spindle, 3,3'... ratchet, 4...
Cylinder, 5, 5'...bearing, 6...spring spring, 7...spring case, 8...mechanical cover, 9...pawl lever, 10...pawl, 11
... Paul spring, 12 ... Tie bar, 13
... Guide roller, 14 ... Guide roller shaft, 15 ... Garnish, 151 ... Webbing feed-out opening, 16 ... Clutch, 161 ... Internal teeth, 17 ... E-ring, 18 ... Friction spring, 19 ... ...Lotsu King Ring, 191...
...teeth, 20...inertia mass, 201...window,
202...Pin, 203...Protrusion, 21...Cam, 211...Sliding hole, 22...Lock arm,
221...Claw, 222...Protrusion, 223...Sliding pin, 23...Sensor spring, 24...Clutch spring, 241...Claw, 25...Sensor, 251...Mechanical holder, 252...Weight, 253...Mechashaft, 254...Mechalever.

Claims (1)

[Scope of utility model registration request] A retractor in which a spindle fitted with a cylinder around which webbing having a ratchet is fitted is attached to a housing, and the webbing can be fed out and returned by the action of a spiral spring installed between the spindle and the housing, At the tip of the spindle, a crown-shaped clutch with internal teeth and a cup-shaped inertia mass, in which a locking ring equipped with an acceleration sensor is frictionally coupled to the outer periphery via a friction spring, are attached to the clutch. The lock arm, which is pivoted to the inertia mass and has a cam attached to its most extreme position that rotates integrally with the spindle, is inserted into the clutch through a window bored in the peripheral wall of the inertia mass. An emergency locking type retractor which can be engaged with a pawl that locks a ratchet through its pawl of a clutch spring that is frictionally connected to the outer periphery of a clutch.