WO2019048008A1

WO2019048008A1 - Belt retractor

Info

Publication number: WO2019048008A1
Application number: PCT/DE2018/200076
Authority: WO
Inventors: Peter Baumgartner; Jochen Benz; Hermann Hasse; Uwe Eisemann; Felix Wachter; Svetlana Grossmann; Cristina Szabo; Hans-Jürgen Divo; Jochen Lang
Original assignee: Joyson Safety Systems Germany Gmbh
Priority date: 2017-09-05
Filing date: 2018-08-14
Publication date: 2019-03-14
Also published as: CN110753644B; CN110753644A; DE102017215573B4; DE102017215573A1

Abstract

The invention relates to a belt retractor (10) for a safety belt, comprising a belt reel (20), a pawl (60) and an electromagnetic deflection device (50). According to the invention, the pawl (60) is connected to the belt reel (20) and is rotated together with the belt reel (20) when the belt reel (20) rotates and can assume a locking position and a release position, in the locking position the pawl (60) interacts with locking teeth (80) and blocks a rotation of the belt reel (20) in the unwinding direction and, in the release position the pawl is separate from the locking teeth (80) and allows a rotation of the belt reel (20), the electromagnetic deflection device (50) being designed such that during active operations it directly or indirectly pivots the pawl (60).

Description

description

Retractor The invention relates to a belt retractor for a safety belt with a belt reel, an electromagnetic ^¬ rule deflecting device and a pawl. Such a belt retractor is known from German Patent DE 103 51 403 B4.

The invention has for its object to further develop a belt retractor of the specified type.

This object is achieved by a belt retractor with the features of claim 1. Advantageous embodiments of the belt retractor according to the invention are specified in subclaims.

Accordingly, the invention provides that the pawl is connected to the belt reel is rotated at a rotation of the belt drum with the belt drum and able to assume a locking Stel ^¬ lung and a release position cooperating locking pawl in the locking position with a locking toothing and rotating the belt reel in Unwinding direction locks and is separated in the release position of the ratchet teeth and allows rotation of the belt reel and the elektromag ^¬ netic deflection device is designed such that it pivots the pawl directly or indirectly during active operation.

A significant advantage of the belt retractor according to the invention is the fact that the pawl, unlike the belt retractor according to the German patent DE 103 51 403 B4, with the belt reel turned. The pawl can thus be deflected in two ways, namely by the action of the electromagnetic deflection or inertia in abrupt belt withdrawal, for example, with the cooperation of a coupling device and a

Auxiliary jack. The pawl can thus advantageously ^perform a dual function, ie operate as an actuator of the electromagnetic deflection device and also form an actuator of a separate sensor unit for the detection of an abrupt belt extension, a change in position and / or a change in the acceleration of the vehicle.

The locking toothing is preferably rotationally fixed. Particularly advantageously, the locking toothing is fixed to the frame, for example attached to the frame or formed in the frame.

It is advantageous if the pawl is coupled via a Koppelein ^¬ direction with an auxiliary pawl and the electromagnetic deflection device cooperates with the auxiliary pawl and pivots this on activation about an axis. The axis is preferably parallel to the axis of rotation of the belt ^¬ coil. The coupling device is - in the untwisted state of the auxiliary pawl - preferably rotated with the belt reel; the co-rotation of the coupling device is preferably blocked by the auxiliary pawl after pivoting / pivoting the auxiliary pawl.

The auxiliary pawl is preferably mounted pivotably on the Kop ^¬ peleinrichtung. The auxiliary pawl is preferably arranged on the coupling device such that it - im untwisted state of the auxiliary pawl - is rotated with the belt reel; the co-rotation of the auxiliary pawl and thus that of the coupling device is blocked after pivoting the auxiliary pawl.

The pawl is preferably in at least one from ^¬ cut of ferromagnetic material. It is also advantageous if the auxiliary pawl in at least one other from ^¬ cut from a different material (eg., Plastic) con- sists.

With respect to the embodiment of the electromagnetic deflection device, it is considered advantageous if this has a rotatably disposed ratchet wheel with a rotationally fixed inner toothing and at least one electrical coil for generating a magnetic field, the pawl in the region of the inner toothing of the ratchet wheel is disposed within ^¬ half and Current flow through the coil a locking portion of the auxiliary pawl pivoted radially outward and is controlled in the internal toothing.

In a preferred embodiment it is provided that the auxiliary pawl in the locking portion of ferromagnetic Mate ^¬ rial and when current flows through the coil of the ferromagnetic locking portion is pivoted radially outward.

The auxiliary pawl is in the latter embodiment ^¬ form outside of the barrier portion or in at least one other section, preferably made of plastic.

The ratchet wheel is preferably completely or at least from ^{¬ section} of ferromagnetic material, preferably iron. The ratchet wheel is preferably ver ^¬ seen with at least one coil or magnetically coupled to at least one coil which generates a magnetic field in the ratchet wheel or at least in a portion of the ratchet wheel ( ^{vorzugswei ¬} se on the outer diameter or on the circumferential surface of the ratchet wheel) in the current-carrying state. By the magnetic field, the auxiliary jack can be ^¬ covered. The ratchet wheel has in a preferred embodiment at least three spokes, which are shipping ^¬ hen each having a coil.

Alternatively or additionally, it can also be provided-in a likewise advantageous manner-that at least one coil, which can couple a magnetic field into the ratchet wheel, is arranged on the outer circumferential surface of the ratchet wheel. It is advantageous in this variant, when two or more coils are arranged on the outer circumferential surface of the ratchet wheel, preferably rotationally symmetrical.

Alternatively or additionally, it may be provided-likewise advantageously-that one or more coils are arranged outside the ratchet wheel, in particular rotationally symmetrical or "star-shaped" or "sunbeam-shaped", and couple a magnetic field from the outside into the ratchet wheel.

In another ^embodiment , which is likewise regarded as advantageous, it is provided that the electromagnetic deflection device has an internal electromagnet for

Generating a magnetic field in the center or at least in the middle ^¬ lar range of the ratchet wheel, in current flow through the electromagnet, a deflection portion of the auxiliary pawl ra- Dial inward in the direction of the center or central region and thus a separate from the deflection section by a Ah ^¬ se (pivot axis) of the auxiliary pawl locking portion is pivoted radially outwardly into the internal teeth of a ratchet wheel of the electromagnetic deflection device or in one or the above-mentioned locking teeth ,

The auxiliary pawl preferably consists in the deflection section of ferromagnetic material and in at least one other section, in particular the locking section, preferably of a different material (eg plastic).

The auxiliary pawl is preferably pivotable about an axis whose pivot axis is arranged parallel spaced from the axis of rotation of the belt reel. The axis is preferably formed by egg ^¬ nem body of the coupling device.

The mass of the auxiliary pawl and / or their mass distribution are preferably dimensioned such that in the case of an abrupt Gurtbandauszugs the auxiliary pawl is pivoted inertially and einsteuert their locking portion in the internal teeth of the ratchet wheel or in the locking teeth.

Regarding the coupling between the pawl and the coupling device or with respect to the coupling between the

Pawl and the auxiliary pawl, it is considered to be ^¬ advantageous when a co-operating with the pawl or integrally connected thereto control pin is guided in a control link of the coupling device and pivots in blocked ter coupling device and rotating belt spool, the pawl outwards into the ratchet teeth. The invention will be explained in more detail with reference to Ausführungsbeispie ^¬ len; thereby show by way of example

Figure 1 in a three-dimensional exploded view obliquely from the side of a first embodiment of a belt retractor according to the invention, in which a ferromagnetic locking portion of a pawl can be pivoted radially outward by an electromagnetic Auslenkein ^¬ direction,

Figure 2 shows the belt retractor according to Figure 1 in the assembled state in a three-dimensional view obliquely from the side, Figure 3 in a three-dimensional exploded view obliquely from the side a second Ausführungsbei ^¬ game for a belt retractor according to the invention, in which a ferromagnetic locking portion of a pawl by an electromagnetic deflection - device can be pivoted radially outward,

FIG. 4 shows the belt retractor according to FIG. 3 in the assembled state in a three-dimensional representation obliquely from the side,

Figure 5 shows an embodiment of an inventive

Belt retractor, in which an electromagnetic Aus ^¬ steering device a ferromagnetic Auslenkab- section of an auxiliary pawl radially inward

pans. For the sake of clarity, the same reference numerals are always used in the figures for identical or comparable components. 1 shows a three-dimensional exploded view of an embodiment of a belt retractor 10. The belt retractor 10 includes a belt spool 20 which is coupled via a coupling device 30 with an auxiliary pawl 40. For deflecting the auxiliary pawl 40, the belt winder 10 has an electromagnetic deflection device 50.

The electromagnetic deflection device 50 includes a non-rotatably mounted ratchet wheel 51, which consists of ferromagnetic material and is equipped with spokes 52. The spokes 52 are each equipped with a coil 53. In Case le ^¬ a current flow through the coil 53, the ratchet wheel 51 and thus a total of magnetized whose outer circumferential surface 54 is. The ratchet wheel 51 is provided with a rotationally fixed internal toothing ^¬ 55, in which the auxiliary pawl 40 can control.

The belt retractor 10 according to FIG. 1 operates as follows:

In normal operation, when the belt reel 20 is only moderately accelerated when unrolling or rolling, the

Coupling device 30 with the belt reel 20 with; the auxiliary pawl 40 is inactive.

If there is an abrupt unrolling of the seatbelt or an abrupt rotation of the belt reel 20 in the unwinding direction, then a locking portion 41 of the auxiliary pawl 40, which is formed by the outer tip of the auxiliary pawl 40, moves radially outward along the direction of the arrow PI due to inertia. ßen pivot and einsteueren in the outside located non-rotatable inner toothing ^¬ 55 of the ratchet wheel 51. By controlling the auxiliary pawl 40, the further rotation of the Kop ^¬ peleinrichtung 30 is blocked, so that it comes to a relative rotation between the belt reel 20 and the coupling device 30.

Due to the relative rotation between the belt reel 20 and the coupling device 30 is a pawl 60, which rotates with the belt reel 20, pivoted radially outward along the arrow ^¬ direction P2. The pivoting of the pawl 60 can be caused for example by a 60 together ^¬ menwirkenden with the locking pawl or to this integrally formed control pin 70 which is guided in a control slot 70a of the coupling device 30 and with blocked coupling means 30 and rotating the belt reel 20, the pawl 60 to outside in a preferably frame-solid locking ^¬ toothing 80 of the belt retractor 20 einsteuert. As soon as the pawl 60 engages in the locking toothing 80, the belt reel 20 is blocked altogether and the safety belt can not be unrolled further.

A return spring, not shown in the figures causes a pivoting back of the auxiliary pawl 40 in its basic position and a return spring 71 causes a pivoting back of the pawl 60 in its basic position as soon as the belt reel ent ^¬ charged and / or slightly rotated back in the winding and the pawl 60 from the Locking teeth 80 and the auxiliary pawl 40 can swing out of the internal teeth 55.

In the belt retractor 10 allows the electromagnetic deflection device 50, the coupling device 30 to electrically regardless of whether it comes to an abrupt unrolling the seat belt or not. The elekt ^¬ romagnetische deflection device 50 can be activated by an electric current is caused by the coil 53. The activation of the electromagnetic deflection device 50 can be effected by an electronic control device, not shown in the figures, as a function of sensor measurement results of sensors, likewise not shown. In the case of a current flow through the coils 53, these and thus the ratchet wheel 51 are magnetized, so that the locking portion 41, which consists of ferromagnetic material such as iron, the auxiliary pawl 40 along the arrow PI pivoted radially outward and into the rotatable internal teeth 55th the ratchet wheel 51 is controlled. By turning on the ferromagnetic locking portion 41 in the rotatable internal toothing 55 - as described above in connection with an inertia-related deflection of the locking portion 41 - blocks the further rotation of the coupling device 30, so that in the case of a relative rotation of the belt reel 20 relative to the coupling device 30 of Control pin 70 in conjunction with the control link in the coupling device 30, the pawl 60 along the direction of the arrow P2 to the outside in the Sperrverzah- 80 will control.

The already mentioned return spring for the auxiliary pawl 40 and the return spring 71 for the pawl 60 also cause a pivoting back of the auxiliary pawl 40 and the pawl 60 in their basic positions as soon as the e- lektromagnetische deflection device 50 and the energization of the coil 53 is turned off. The auxiliary pawl 40 is preferably only in the locking portion 41 of ferromagnetic material; Otherwise, or in the region of its basic body 42, the auxiliary pawl 40 can be made of plastic, for example. The auxiliary pawl 40 is preferably held rotatably by an axle 43, which is arranged parallel spaced from the axis of rotation R of the belt reel 20. The axis 43 is preferably formed by the coupling device 30 ge ^¬ . FIG. 2 shows the belt retractor 10 according to FIG. 1 in the assembled state.

The coupling device 30 preferably consists of a non-magnetizable, in particular non-ferromagnetic material. It is advantageous if the coupling device 30 consists of plastic.

3 shows an embodiment for a belt retractor ^¬ 10, wherein the electromagnetic Auslenkeinrich- tung 50 unlike in the embodiment variant according to Fi ^¬ gures 1 and 2 is designed. It can be seen that the coils 53 are not on the spokes 52 of the ratchet wheel 51 at ^¬ arranged, but on the outer circumferential surface 54 of the ratchet wheel 51st

Incidentally, in particular with regard to the operation and the radial pivoting of the locking portion 41 in the case of ei ^¬ ner activation of the electromagnetic deflection device 50, the embodiment according to FIG 3 corresponds to the embodiment according to Figures 1 and 2. If a so e- lectrical Current fed into the coils 53, the coils lead to a magnetization of the ratchet wheel 51 and the outer circumferential surface 54, so that the ferromagnetic barrier portion 41 of the auxiliary pawl 40 is pivoted radially outwardly along the arrow direction PI in Figure 3 to the outside and is controlled in the rotatable internal toothing 55. Once the pawl is swung out 40, a further rotation of the coupling means 30 is blocked, so that in case of a belt ^¬ ribbon extract the belt reel 20 is rotated relative to the coupling means 30, which in turn the pawl 60 by means of the control pin 70 and the control link in the Koppelein ^¬ direction 30 along the direction of the arrow P2 outwardly into the outer locking teeth 80 of the belt retractor 10 is pivoted.

FIG. 4 shows the belt retractor 10 according to FIG. 3 in the assembled state.

5 shows another embodiment for the design of the electromagnetic deflection device 50 and the pawl 40. The electromagnetic Auslenkein ^¬ device 50 comprises a ratchet wheel 51 and an internal solenoid 58 which cooperates with a ferromagnetic deflecting section 45 of the sub-pawl 40th The Sperrab ^{¬ section} 41 and the deflection portion 45 form two lever ends of a lever whose lever ends are separated by the axis 43.

If the internal solenoid activated 58, the deflection section 45 of the pawl 40 is pivoted radially inwardly along the direction of arrow P3, so that the Sperrab cut ^¬ 41 along the direction of the arrow PI to the outside in the non-rotatable inner teeth 55 of the outer ratchet wheel 51 of the electromagnetic deflection device 50 is controlled. As soon as the auxiliary pawl 40 engages in the ratchet wheel 51, a further rotation of the coupling device 30 (see FIG. ren 1 to 4), so that subsequently the pawl 60 (see Figures 1 to 4) can engage outwardly into the ratchet teeth 80, as has already been explained above in connection with Figures 1 to 4; In this regard, the above statements apply accordingly.

In the embodiment of Figure 5, the Sperrab ^{¬ section} 41 may consist of a non-magnetizable or non-ferromagnetic material, eg. B. plastic.

To pivot back the auxiliary pawl 40 is a restoring ^¬ spring 59, which is preferably a compression spring.

Although the invention in detail by preferred execution ^¬ examples has been illustrated and described in detail, the invention is not limited by the disclosed examples and other variations can be derived therefrom by the skilled artisan without departing from the scope of the invention.

Reference sign list

10 belt retractor

20 belt reel

30 coupling device

40 auxiliary latch

41 lock section

42 basic body

43 axis

45 ferromagnetic deflection section

50 electromagnetic deflection device

51 ratchet wheel

52 spokes

53 coil

54 outer circumferential surface

55 non-rotatable internal toothing

58 electromagnet

59 return spring

60 pawl

70 control pin

70a control gate

71 return spring

80 ratchet teeth

PI arrow direction

P2 arrow direction

P3 arrow direction

R rotation axis

Claims

claims

A belt retractor (10) for a safety belt with a belt spool (20), a pawl (60) and an electromagnetic deflection device (50),

characterized in that

- The pawl (60) is connected to the belt reel (20), is rotated in a rotation of the belt reel (20) with the belt reel (20) and can assume a blocking position and a release position,

- The pawl (60) cooperates in the blocking position with a locking toothing (80) and a rotation of the belt reel (20) locks in the unwinding and separated in the release position of the ratchet teeth (80) and a rotation of the belt reel (20) allowed and

- The electromagnetic deflection device (50) is formed from ^¬ such that it pivots the pawl (60) directly or indirectly during active operation. 2. belt retractor (10) according to claim 1,

characterized in that

- The pawl (60) via a coupling device (30) with an auxiliary pawl (40) is coupled and

- The electromagnetic deflection device (50) with the

Auxiliary pawl (40) cooperates, and when activated, this about an axis which is preferably parallel to the rotational property, ^¬ se of the belt reel (20) pivots.

3. Belt retractor (10) according to one of the preceding claims,

characterized in that

the auxiliary pawl (40) is pivotally mounted on the coupling device (30).

4. belt retractor (10) according to one of the preceding claims,

characterized in that

, the auxiliary latch (40) in such a way on the coupling device (30) is arranged that it - is also rotated with the belt reel (20) and - - in the non-pivoted state, in the pivoted level too ^¬ - blocked their co-rotation, and thus the said coupling means (30).

5. belt retractor (10) according to one of the preceding claims,

characterized in that

the auxiliary pawl (40) consists of at least one section of ferromagnetic material and in at least one other section of another material.

6. belt retractor (10) according to one of the preceding claims,

characterized in that

- The electromagnetic deflection device (50) has a rotatably ^¬ fixedly arranged ratchet wheel (51) with a non-rotatable In ^¬ nenverzahnung (55) and at least one electrical coil (53) for generating a magnetic field,

- The auxiliary pawl (40) in the region inside the inner ^{Verzah ¬} tion (55) of the ratchet wheel (51) is arranged and

- When current flows through the coil (53) a blocking section

(41) of the auxiliary pawl (40) is pivoted radially outward and into the internal toothing (55) is controlled.

7. belt retractor (10) according to claim 6,

characterized in that - The auxiliary pawl (40) in the locking portion (41) made of ferromagnetic material and

- When current flows through the coil (53) of the ferromagnetic locking portion (41) is pivoted radially outward.

8. belt retractor (10) according to any one of the preceding claims 6 to 7,

characterized in that

the ratchet wheel (51) wholly or at least partially made of ferromagnetic material, preferably iron.

9. belt retractor (10) according to any one of the preceding claims 6 to 8,

characterized in that

outside of the ratchet wheel, on the outer circumferential surface (54) of the ratchet wheel (51) and / or on a spoke (52) of the locking ^¬ wheel (51) at least one coil (53) is arranged, which in the current-carrying state, a magnetic field in the ratchet wheel (51) or at least coupled into a portion of the ratchet wheel.

10. belt retractor (10) according to any one of the preceding claims 6 to 9,

characterized in that

two or more coils are present, which are preferably arranged rotationally symmetrical, star-shaped or sun-ray-shaped.

11. Belt retractor (10) according to one of the preceding claims,

characterized in that

- the electromagnetic deflecting device (50) in a ^¬ nenliegenden electromagnet (58) for generating a Mag- in the center or at least in the middle region of the ratchet wheel (51),

- When current flows through the electromagnet (58) a deflection portion (45) of the auxiliary pawl (40) radially inwardly toward the center or central region and one of the Auslenkabschnitt (45) by a pivot axis of the auxiliary pawl (40) separate locking portion (41 ) is pivoted radially outward in an internal toothing (55) of the ratchet wheel (51) of the electromagnetic deflection device (50) or in a locking toothing (80).

12. belt retractor (10) according to claim 11,

characterized in that

the auxiliary pawl (40) in the deflection section (45) made of ferromagnetic material and in at least one other section, in particular the locking section (41), consists of a material on its ^¬ .

13. Belt retractor (10) according to one of the preceding claims,

characterized in that

the auxiliary pawl (40) is pivotable about an axis (43) and the mass of the auxiliary pawl (40) and its mass distribution are dimensioned such that in the case of an abrupt belt withdrawal, the auxiliary pawl (40) is pivoted as a result of inertia and its locking portion (41) in the internal toothing (55) of the ratchet wheel (51) or in the locking toothing (80) einsteuert.

14. Belt retractor (10) according to one of the preceding claims,

characterized in that

a control pin (70) cooperating with or integrally connected to the pawl (60) in a control unit. Lisse (70 a) of the coupling device (30) is guided and blocked at coupling device (30) and rotating belt reel

(20) the pawl (60) outwardly into the ratchet teeth

(80) pivots.