JPH0562092B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a safety belt take-up roller,
A locking device is provided for locking the belt reel, the locking device having a control disc supported on the belt reel, which controls a locking disc supported on the belt reel during locking. It is rotatable within a predetermined angular range relative to the belt reel in order to engage the pawl with the immovable locking toothing, and this control disc also has a strongly accelerated pull-out of the belt. A mass disk is provided as a motion-responsive sensor, and in response to a strongly accelerated withdrawal movement of the belt, the mass disk
It relates to a type of device which, during its operation, causes a relative rotational movement between the belt reel and the control disk by means of its inertial mass.

[Conventional technology]

In this type of known safety belt take-up roller (see Japanese Patent Publication No. 59-21624),
A control disk, made of plastic, for example, is rotatably mounted on the belt reel within a predetermined angular range. This control disk transmits the control movement produced by the sensor to the locking device and serves to lock the belt shaft in case of danger.
In known devices of this type, it is known to provide toothing on the outer periphery of the control disk. This toothing cooperates with a sensor sensitive to the movement of the motor vehicle, for example a ball sensor, in the following manner. That is, when the sensor is actuated, the control disc is locked instantaneously via the corresponding pawl, and a relative movement occurs between the control disc and the belt shaft provided in the locking device. This relative movement causes the locking pawl of the locking device to be moved into engagement with the stationary locking toothing via a control cam provided on the control disc. It is also known to fasten a mass disk, for example made of metal, to the control disk. Due to its inertia, this mass disk produces a relative rotational movement between the control disk and the belt reel when the belt is strongly accelerated and pulled. This relative rotational movement also causes the locking pawl of the locking device to move. According to DE 24 24 787 A1, it is also known to connect a mass disk to a control disk via a friction coupling in a similarly constructed safety belt winding roller. .

For this type of safety belt take-up roller,
A conventional method consisting of a rope disc connected to a belt reel with a pull-back rope, a drive piston and a pyrotechnic drive, as disclosed in DE 2809587 A1 If equipped with a safety belt retraction device, when said drive device is triggered, the belt reel will:
The belt is rotated back with a very high angular acceleration in the direction of pulling it back. This direction of rotation is opposite to the normal locking direction of the belt. In such an extreme return rotation, the entire locking device will rotate together. This is because the control disk is mounted on the belt reel so that it can be rotated relative to the belt reel over a predetermined angular range. At the end of this pullback process,
The masses that rotate together with the belt reel, that is to say for example the control disc and in particular the mass disc, exert very strong impact forces on the control element. Particularly if such safety belt take-up rollers are of lightweight construction and, for example, the control elements, etc. are made of lightweight plastic, there is therefore a risk of these components being destroyed.

[Problem to be solved by the invention]

An object of the present invention is to provide a safety belt winding roller having the structure disclosed in Japanese Patent Publication No. 59-21624.
To reliably prevent an unfavorable influence on a locking device caused by a belt pullback movement when a safety belt pullback device that automatically operates in the event of a danger such as a collision is provided.

[Means to solve the problem]

According to the configuration of the present invention that solves this problem, a belt pull-back device is provided to automatically rotate the belt reel in the winding direction in the event of a danger, and the mass disk is connected to a ratchet spring and a tooth row. is connected to the control disc via a ratchet coupling consisting of a belt reel, which ratchet coupling allows relative rotation of the mass disc with respect to the control disc only in the direction of belt winding rotation of the belt reel. It's becoming like that.

〔Effect of the invention〕

According to the invention, a specially configured ratchet coupling is interposed between the mass disk and the control disk, so that at the end of the retracting movement, the mass disk and the control disk are integrally connected. The coupling engagement is released, allowing further rotation of the mass disk relative to the control disk. In this way, the kinetic energy due to the relatively large mass of the mass disk is no longer transmitted impulsively to the respective components, such as the locking device, so that destruction of these parts is reliably avoided. Ru.

Even after the integral coupling engagement is released, the coupling remains functional. This means that control of the control disk based on sensors sensitive to the movement of the belt (the mass disk itself) is entirely possible even immediately after the retracting movement. In other words, it is undesirable that an influence that could cause a failure occur.

〔Example〕

Next, the configuration of the present invention will be specifically explained with reference to the embodiments shown in the drawings.

FIG. 1 shows the basic structure of a safety belt retractor according to one embodiment of the present invention. A belt reel 4 is rotatably supported between the two legs 1 and 2 of the U-shaped winding frame 3, and a flexible belt 5 is wound around the belt reel 4. This belt reel 4
A return coil spring (not shown), a belt retraction device and a belt locking device are engaged with the belt. The components of the belt retraction device include, for example, a rope disk 6 that is connected to the belt reel 4 in the event of a collision or the like, and a pullback roller 7 that is wound around the rope disk 6. This retraction roller 7 is connected in a drive cylinder 8 to a drive piston. This drive piston has a casing 9
Inside, it is connected to an electrically ignitable pyrotechnic drive. When this drive is ignited,
Drive piston in drive cylinder 8 (see Figure 1)
is moved upwards with a rope disc 6 connected to the belt reel 4, and the belt reel is pulled back and rotated until the belt 5 hits the body of the occupant using it. The roller disc 6 as well as the return spring arranged on the rope disc side are arranged in the cover 10. On the inside of the cover 11 opposite the winding frame 3 there is provided a locking device of known type, for example with a locking pawl, which is pivotably mounted on the flange of the belt reel 4. This locking pawl cooperates with a fixed row of locking teeth formed on the leg 2 of the winding frame 3. A control disk 12 is mounted on the extension of the belt reel 4 so as to be rotatable within a predetermined angular range against the force of a spring (not shown). This control disc 12 located on the outside of the cover 11 has an external pawl 13 that cooperates with a control lever 14 of a ball sensor 15 that is sensitive to the movements of the motor vehicle.
It is equipped with A mass disk 16 made of metal is connected to the control disk 12, for example made of plastic. The mass disk 16 here has the role of a sensor sensitive to the movement of the belt. When the car suddenly decelerates or suddenly accelerates, the ball sensor 15 reacts and the control lever 14 moves the pawl 1.
3 so that the control disc 12 is locked. As a result, when a relative movement occurs between the further rotating belt reel 4 and the locked control disc 12, the control additional part 12a (the second a
(see figure) pushes the locking claw inside the cover 11 and engages the fixed locking tooth row of the locking claw, so that the belt reel 4 is finally locked.
In addition to this locking effect, the belt reel 4 is locked via a mass disk 16 which is a sensor sensitive to the movement of the belt. That is, when the belt is strongly accelerated and pulled due to inertia, the control disk 12 connected to the mass disk 16 moves the belt reel 4.
The resulting relative movement between the control disc 12 and the belt reel likewise moves the locking pawl into the locking position.

Figures 2a-2c show details of the ratchet coupling. This ratchet coupling allows the mass disc 16 to rotate relative to the control disc 12 at the end of the retraction movement, overcoming the coupling engagement forces between the mass disc 16 and the control disc 12. It's becoming like that. Forces resulting from the movement of the mass disk 16 therefore no longer act adversely on subsequent parts, such as control disks, locking pawls, etc. As mentioned above, the control disc 12 controls the belt reel 4 within a predetermined angular range.
The belt reel 4 is supported on the belt reel 4 so as to be rotatable relative to the spring against the spring force. During normal operation, the control disc 12 rotates together with the belt reel 4. In this case, the control disk 12 is pressed against the stop, for example by the spring force of the spring. With this stopper, the control disc 12
is entrained during the winding movement and during the withdrawal movement.
When one of said sensors is actuated, the control disc 12 is either locked by the sensor 15 or braked by the inertia of the mass disc 16, so that the belt rotates in the withdrawal direction of arrow a. Reel 4 and control disc 12 provide the relative movement necessary to operate the locking pawl. During the belt retraction movement, the belt reel 4 moves in the direction of arrow b (see FIG. 2c). That is, during this movement, the belt reel 4 is moved by the control disc 1.
2 and the mass disk 16. Figure 2a ~ 2nd
The coupling type shown in FIG. c is such that, at the end of the retracting movement, the mass disk 16 can rotate above the rotational speed of the control disk 12.

As shown in FIGS. 2a to 2c, the mass disk 16 is rotatably supported on the bearing attachment portion 12c of the control disk 12, and the axial holding member 1
7. Mass disk 1
The bearing opening 16a of No. 6 has a tooth row 22. A cutout 23 is provided in the bearing attachment portion 12c, that is, in the bearing boss of the control disk 12, and extends substantially tangentially. A ratchet spring 24, which is constructed as a spring piece made of metal or plastic, is inserted into this cutout 23 and locked therein. The free spring end of this ratchet spring 24 spring-elastically engages the toothing 22 of the mass disk 16, so that during normal rotation of the belt reel 4 and in particular when the belt reel 4 is rotated as shown in FIG. 2c. During rotation in the direction of arrow b, a firm coupling engagement between control disk 12 and mass disk 16 is formed. That is, these two parts (control disc 12 and mass disc 16) are engaged for rotation together with each other. However, only if the belt reel 4 rotates significantly faster in the direction of arrow b due to the belt retraction movement, upon deceleration or stopping of the belt reel 4, the coupling force of the ratchet spring 24 is overcome and the mass disc 16 is It is adapted to be able to rotate at a speed exceeding the rotational speed of the control disk 12.

[Brief explanation of the drawing]

1 is a schematic perspective view of a safety belt take-up roller according to one implementation of the invention, FIG. 2a is an exploded view of the ratchet coupling section, and FIG. 2b is a cross-sectional view of the ratchet coupling section in the assembled state. The top view, FIG. 2c, is a cross-sectional view of the ratchet coupling portion as seen from the front side. DESCRIPTION OF SYMBOLS 1, 2... Leg, 3... Winding frame, 4... Belt reel, 5... Belt, 6... Rope disc, 7... Pulling back roller, 8... Drive cylinder, 9... Casing, 10, 11... Cover, 12... Control circle Board, 12
a...Control addition part, 12b, 12c...Bearing addition part,
13... Claw, 14... Control lever, 15... Ball sensor, 16... Mass disk, 16a... Bearing opening, 17...
Axial direction holding member, 18...Groove, 22...Tooth row, 23...
Notch, 24...Ratchet spring, a, b...Arrow.

Claims (1)

[Claims] 1. A safety belt take-up roller, which is provided with a locking device for locking the belt reel 4, the locking device comprising a control disc 12 supported on the belt reel 4. and the control disk 1
2 is rotatable within a predetermined angular range relative to the belt reel 4 in order to engage the locking pawl supported by the belt reel 4 with an immovable locking tooth row when locking; Furthermore, this control disk 12 includes
A mass disk 16 is provided as a sensor which responds to the strongly accelerated withdrawal movement of the belt 5, and which, in response to the strongly accelerated withdrawal movement of the belt 5, responds by its inertial mass. A belt retracting device 6 for automatically rotating the belt reel 4 in the winding direction in the event of a danger in a type that produces a relative rotational movement between the belt reel 4 and the control disk 12;
7, 8, 9 are provided, and the mass disk 16
is connected to the control disc 12 via a ratchet coupling consisting of a ratchet spring 24 and a tooth row 22.
The ratchet coupling is connected to the belt winding rotation direction b of the belt reel 4.
Mass disk 16 relative to control disk 12 only in
A safety belt take-up roller, characterized in that it is adapted to allow relative rotation of. 2 The ratchet spring 24 is connected to the control disc 1.
In the notch 23 extending substantially tangentially formed in the bearing attachment portion 12c of 2, or in the mass disk 16
The free spring end of the ratchet spring 24 is adapted to be secured within the bearing opening 16a of the
The safety belt take-up roller according to claim 1, which engages with the tooth row 22 provided in the bearing opening 16a or the bearing addition portion 12c.