Winding – tensioning – or guiding – Reeling device – With spring motor
Patent
1996-12-10
1998-08-18
Jillions, John M.
Winding, tensioning, or guiding
Reeling device
With spring motor
B60R 2246
Patent
active
057948755
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a belt retractor for a vehicle safety belt system comprising a locking device for a belt drum and a rotary belt pretensioner drive, said drive being able to be connected drivingly with a drive pinion for the belt drum via a coupling having pawls able to be shifted between a rest position out of engagement with the drive pinion and a working position in engagement with the drive pinion.
In the case of such a belt retractor a drive connection between the belt drum and the belt pretensioner drive is only produced by actuation of the coupling so that the belt drum is able to be turned in normal duty without hindrance. However it is desirable for the belt drum to be able to be turned again freely as well after the tensioning operation.
Accordingly one object of the invention is to further develop a belt retractor of the type initially mentioned in such a manner that the drive connection of the coupling is terminated again after the end of the tensioning operation in a reliable fashion.
In the case of a belt retractor of the type initially mentioned such aim is attained because the coupling pawls are able to be moved positively both out of the rest position into the working position and furthermore from the working position into the rest position by running against cam surfaces rotating in relation to them. This design renders possible, owing to the positive movement of the coupling pawls, a reliable termination of the drive connection of the coupling after the end of the tensioning process.
In accordance with the preferred embodiment of the invention there is a provision such that on a drive side thereof the coupling possesses a hub, on which the coupling pawls are deflectably supported and a cage releasably fixed on the housing of the belt retractor and on which the cam surfaces are formed. This design renders possible a form of the coupling which is particularly compact in the radial direction, since the setting of the coupling pawls is effected by a rotary movement.
In accordance with the preferred embodiment of the invention there is the further provision that the hub is arranged concentrically to the drive pinion, that between the hub and the drive pinion an annular space is formed, in which the coupling pawls are arranged, a first end thereof so bearing on the hub that a second end thereof is able to be pivoted into engagement with the gear teeth of the drive pinion, that the coupling pawls are provided with a guide in ramp and with a guide out ramp and in that the cam surfaces of the cage, which is as well concentric to the drive pinion, are formed on projections extending into the annular space between the coupling pawls as guide in surfaces and guide out surfaces, which cooperate with the guide in and, respectively, the guide out ramps. Owing to this configuration it is possible to obtain a form of the coupling which is compact in the axial direction.
In accordance with the preferred embodiment of the invention there is the further provision that the first end of each coupling pawl is designed with a rounded projection pivotally mounted in a corresponding recess at the inner side of the hub. In cooperation with the positive movement for the coupling pawls such supporting action for the first end of the coupling pawls means that there is a particularly simple bearing arrangement for the coupling pawls.
In accordance with the preferred embodiment of the invention there is the further provision that the hub possesses a radial support shoulder for each coupling pawl. This configuration means that there is a more particularly advantageous transmission of force to the coupling pawls, something which contributes to a compact form of the coupling.
The invention will now be described with reference to the preferred embodiment, which is shown in the accompanying drawing.
FIG. 1 shows a perspective exploded view of a belt retractor in accordance with the invention.
FIG. 2 is a perspective and partially sectioned view of a coupling as employed in the belt retractor of FIG. 1.
FIG. 3 is a d
REFERENCES:
patent: 4546934 (1985-10-01), Nishimura et al.
patent: 4568037 (1986-02-01), Kawaguchi et al.
patent: 4585184 (1986-04-01), Kawaguchi et al.
patent: 4592520 (1986-06-01), Kawaguchi
patent: 4932603 (1990-06-01), Yamanoi et al.
Jillions John M.
TRW Occupant Restraint Systems GmbH
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