WO2010051949A1

WO2010051949A1 - Seatbelt retractor with deactivatable locking system

Info

Publication number: WO2010051949A1
Application number: PCT/EP2009/007814
Authority: WO
Inventors: Guillem Aranda; Volkmar Heine
Original assignee: Autoliv Development Ab
Priority date: 2008-11-10
Filing date: 2009-10-31
Publication date: 2010-05-14
Also published as: DE102008056552B3; JP5639068B2; WO2010051949A8; JP2012508136A

Abstract

The invention relates to a seatbelt retractor for a motor vehicle, with a locking system which may be controlled in a manner sensitive to the seatbelt and/or the vehicle, comprising a toothed disc (1) mounted on the belt shaft which may be released from a toothing fixed to the housing, wherein the locking system may be deactivated at least in a region for a given length of seatbelt pay-out. The toothed disc (1) being spring-loaded by a spring (8) against the release movement and a locking body (9) being provided for deactivating the locking system, which may be moved from a first position releasing the spring (8) in a second position locking the spring (8) depending on the seatbelt pay-out length.

Description

Seat belt retractor with deactivatable locking system

The invention relates to a safety belt retractor with the features of the preamble of claim 1.

WO 2008/064870 A1 already discloses a safety belt roller with a toothed disk which can be locked in a housing-fixed toothing and whose traction movement is controlled by a control disk provided with an external toothing with a mass amount. The vehicle acceleration sensor and the belt-band-sensitive activation of the control disk can be deactivated in a functional area in which almost the entire safety belt is wound on the belt shaft. This is to prevent the locking system of the seat belt retractor, e.g. is activated inadvertently at very fast Gurtbandeiniauf and subsequent sudden stopping and the seat belt retractor is then blocked. To deactivate the blocking system, a locking lever is provided, which is mounted on the control disk of the seatbelt retractor and, in a switching position, shuts off both the vehicle acceleration sensor and determines the inertial mass of the belt-sensitive control. This deactivates the blocking system by deactivating the sensors with a locking lever

The object of the invention is to provide a seat belt retractor in which the deactivation of the blocking system is realized as simply as possible and as reliably as possible.

In order to achieve the object, it is proposed according to the invention that the toothed disk be held by a spring against the control movement is spring-loaded, and for deactivating the blocking system, a blocking member is provided, which is movable in response to the Gurtauszugslänge from a first spring-releasing position in a second spring-blocking s position. The invention makes use of the fact that the spring movement of the locking system against the spring force exerted by the spring spring force or the threshold of release of the blocking system is significantly influenced by the spring, lo so that the deactivation of the blocking system in a simple manner This can be done by just the spring is blocked. By blocking the spring, either the entire movement of the spring can be blocked or only the spring force and thus the response threshold of the blocking system can be increased so far that the toothed disk with rapid Gurtbandeinlauf and sudden subsequent stopping the inlet movement and / or from a can not unintentionally control the predetermined belt extension length and blocks the seat belt retractor in the belt pull-out direction.

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This can be achieved in particular by the blocking member in the second position resting against the spring and thereby increasing the spring force exerted on the toothed disk by the spring force and / or limiting its movement.

25

It is also proposed that the blocking system comprises a control disc controlling the control movement of the toothed disc, and the spring is connected at one end to the control disc and at the other end to the toothed disc. This 30 offers the advantage that in the proven use of a control disk for controlling the control movement just the blocked spring is also located directly between the parts causing the control movement of the toothed disc, and thus immediately blocking the modulation movement.

In this case, it makes sense to form the blocking element and the control disk in one piece, so that the blocking element can be injection-molded as a plastic injection-molded part when the control disk is formed.

It is also proposed that the spring is designed as an omega spring, and the blocking member engages in the second position in the omega spring. The use of an omega spring is particularly advantageous here, since it performs a clearly defined deformation movement by the spreading of the ends when the toothed disk is being controlled, and the blocking member can be reliably arranged at a position at which it causes the desired blocking of the spring.

Since the deformation movement in the middle of the arc of the omega spring is the greatest, it is also proposed that the blocking member engages centrally between the ends in the omega spring.

In this case, it is also advantageous if the plane spanned by the omega spring plane and the movement of the blocking member from the first to the second position are arranged perpendicular to each other. Thus, the deformation movement of the spring and the advancing movement of the blocking member are also arranged perpendicular to each other, and it is sufficient even a small feed movement of the blocking member to intervene blocking in the deformation of the spring.

A particularly reliable and cost-effective control of the movement of the blocking member from the first to the second position can be achieved by this by a driven by the belt shaft counting gear is controlled. The control is carried out without any sensors or electronic controls, so that no electrical connection to the outside to external control units or energy sources is required.

It is also proposed that the blocking element has a switching cam on which a radially moved switching element is applied, and the radial movement of the switching element is converted by the switching cam in an axial movement of the blocking element. This results in a cost-effective mechanical way to produce the feed movement of the blocking member, which can be arranged in small installation spaces on the seat belt retractor.

The invention will be explained in more detail with reference to a preferred embodiment. The figures show in detail:

FIG. 1a: Seat belt retractor with controlled toothed disk

Fig. Ib: sectional view A-A of Fig. Ia

Fig.2a: Seat belt retractor with blocking member in the spring releasing position

Fig.2b: sectional view A-A from Fig.2a

3a: Seat belt retractor with blocking member in the spring blocking position

3b: sectional view AA from Fig.3a Fig.4: Swash plate

In FIG. 1 a, a seatbelt retractor according to the invention is first of all to be recognized, which has a locking system with a toothed disk 1 which can be activated in a housing-fixed toothing 2. The toothed disc 1 is pivotally mounted on a belt shaft, not shown, of the seat belt retractor and spring-loaded against a spring 8 against the Aussteuerbewegung. In the position shown in Fig. Ia, the toothed disc 1 is controlled in the toothing 2, so that the spring 8 is tensioned.

FIG. 1b shows the sectional view along the cutting direction A-A from FIG. 1a. Specifically, a control disk 3, a housing-fixed teeth 2 and driven by the belt shaft, not shown, designed as a swash plate counting gear 4 can be seen. Furthermore, the spring 8 can be seen, which is mounted with its ends 8a and 8b on the control disc 3 and on the toothed disc 1. In the

Control disk 3 is provided in a known manner a control contour, not shown, in which a guide pin of the toothed disc 1 engages, so that the toothed disc 1 performs a forced by the control contour in the toothing 2 in the execution of a relative rotation of the control disc 3 relative to the belt shaft. The relative rotation between the control disk 3 and the belt shaft is effected either by engaging a housing-fast vehicle acceleration sensitive driven blocking lever in an outer toothing 7 of the control disk 3, or by an inertia-related retention of the control disk 3 with respect to the belt shaft with fast Gurtbandauszug. On the control disk 3, a blocking member 9 is provided, which is formed integrally with the control disk 3 via a switching cam 10. At the side facing away from the toothed disc 1 side, a switching element 5 is provided, which rests against the switching cam 10. The movement of the switching element

5 is engaged via a guide pin 14 engaging in a guide track 14 of the counter gear 4 designed as a swash plate

6 controlled. The counting gear 4 is driven by the belt shaft and carries out a tumbling motion, in which the swash plate with the internal toothing 11 rolls on the external toothing 12 of the control disk 3. Here, the swash plate performs a wobbling feed movement relative to the control disk 3, so that the guide pin 6 along the wavy control contour 15, as can be seen in Figure 4, is moved.

With reference to the positions shown in Figures 2a, 2b, 3a and 3b, the blocking operation of the spring 8 will be described below. In Fig 2a, the switching element 5 is in the radially outer position, and the blocking member 9 is in the first position in which the spring 8 is released. The locking system of the seat belt retractor blocked in this position of the blocking member 9, the Gurtbandauszug according to legal requirements as a function of the vehicle acceleration and the GurtbandausZugsbeschleunigung. The guide pin 6 of the switching element 5 is e.g. In the position shown in Figure 4 in the radially outer region of the guideway 14 and abuts the control contour 15 at.

When the webbing retraction is continued, the countertransmission 4 counting the belt shaft rotations in the form of the swashplate carries out a counterclockwise wobbling motion, in which the switching point 16 is moved toward the guide pin 6. When passing through the guide pin 6 by the switching point 16 is the guide pin 6 and thus the switching element 5 is urged radially inward and displaces the blocking member 9 by the contact with the switching cam 10 in the in Fig.3a and 3b shown second position. The switching point 16 corresponds by the number of hitherto performed revolutions of the counting gear 4 of the predetermined Gurtbandauszugslänge, in which the blocking system is deactivated.

As was shown in FIG. 3b, the blocking member 9 has been displaced axially and engages approximately centrally in the spring 8 designed as an omega spring. If, in this position, the control disk 3 is slightly rotated with respect to the belt shaft, as e.g. can occur due to the fast Gurtbandeiniauf, the subsequent deceleration or generally when the sensors with retracted webbing, so the sprocket 1 due to the blocked spring 8 not aussteuern in the position shown in Fig. Ia, since the spring 8 by abutment on the Blocking member 9 can not deform radially inwardly. Furthermore, the toothed disc 1 is prevented from automatically executing the disengagement movement even when high centrifugal accelerations and radial forces caused thereby occur due to their mass. In this case, the blocking of the spring 8 by the blocking member 9 only as far as can absorb forces, as they can occur at fully einlaufendem webbing or fully wound belt. For this purpose, it is sufficient if the spring force exerted by the spring 8 on the toothed disc 1 spring force is increased by the engaging blocking member 9 so far that the increased threshold of the blocking system prevents the toothed disc 1 in the toothing 2 einsteuert. Slight movements of the toothed disc 1 are absolutely harmless, as far as the seat belt retractor is not blocked.

Claims

Claims :

1. Seat belt retractor for motor vehicles with a belt-sensitive and / or vehicle-sensitive controllable

5 locking system, with a mounted on the belt shaft in a housing-fixed toothing aussteuerbaren toothed disc (1), wherein the blocking system is deactivatable at least in a range of a predetermined Gurtauszugslänge, characterized in that the toothed disc (1) by a lo a spring (8) is spring-loaded against the Aussteuerbewegung and for deactivating the blocking system, a blocking member (9) is provided, which in dependence on the Gurtauszugslänge from a first spring (8) releasing position in a second the spring (8) blocking- i5 de position is movable.

2. Seat belt retractor according to claim 1, characterized in that the blocking member (9) rests in the second position on the spring (8).

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3. Seat belt retractor according to one of claims 1 or 2, characterized in that the blocking system comprises a control movement of the toothed disc (1) controlling the control disc (3), and the spring (8) having an end 25 (8b) with the control disc (3 ) and with the other end

(8a) is connected to the toothed disc (1).

4. Seat belt retractor according to claim 3, characterized in that the blocking element (9) and the control

30 disc (3) are integrally formed.

5. Seat belt retractor according to one of the preceding claims, characterized in that the spring (8) as Omega spring is formed, and engages the blocking member (9) in the second position in the omega spring.

6. The seatbelt retractor according to claim 5, characterized in that the blocking member (9) is arranged centrally between the

Ends (8a, 8b) engages the omega spring.

7. Seat belt retractor according to one of claims 5 or 6, characterized in that the plane spanned by the omega spring lo and the movement of the blocking member

(9) are arranged from the first to the second position perpendicular to each other.

8. Seat belt retractor according to one of the preceding i5 claims, characterized in that the movement of the

Blocking member (9) from the first to the second position by a driven by the belt shaft counting gear (4) is controlled.

9. Seat belt retractor according to one of the preceding claims, characterized in that the blocking element (9) has a switching cam (10) on which a radially moved switching element (5) is applied, and the radial movement of the switching element (5) by the switching cam (10 )

25 is converted into an axial movement of the blocking element (9).