Seat belt retractor and vehicle seat

Abstract

The invention relates to a belt retractor (10) for fastening in and / or on a backrest (41) of a vehicle seat (40), the belt retractor (10) having a housing (11) in which a belt shaft (12) is rotatably mounted about an axis of rotation (25), on which belt shaft a belt (13) of the belt retractor (10) is wound to form a cylindrical belt winding (26). According to the invention, the housing (11) comprises two housing halves (16, 17) which at least partially radially surround the belt winding (26), at least one further functional module (35) of the belt retractor (10) being arranged in the housing (11) along the axis of rotation (25) of the belt shaft (12). The invention also relates to a corresponding vehicle seat (40).

Description

[0001] The present invention relates to a seat belt retractor having the features of the preamble of claim 1 and to a vehicle seat having the features of the preamble of claim 15.

[0002] Restraint devices for motor vehicles include not only airbags but also seat belt devices that directly restrain the occupants via seat belts. The seat belt device can, for example, be designed as a three-point seat belt. In this case, one end of the seat belt can be wound onto the belt shaft of a seat belt retractor that can be locked in the pulling-out direction, and the other end is fixed to the vehicle via an end fitting. In addition, the seat belt has a tongue that can be locked in a buckle fixed to the vehicle, and in the locked position, the tongue divides the webbing of the seat belt into a diagonal belt portion that passes across the occupant's chest and a lap belt portion that passes across the occupant's pelvis. If the seat belt device is designed as a two-point seat belt or a four-point seat belt, the free end can alternatively be directly locked in the buckle fixed to the vehicle by the tongue.

[0003] The restraint force to be exerted in the event of an accident is then transmitted from the seat belt via connection points attached to the vehicle (i.e., the seat belt retractor, the end fitting, and / or the buckle) and into the vehicle structure, such that these components themselves and the way they are fixed to the vehicle structure must be designed to correspondingly bear the load. In addition, when the seat belt exits from the belt shaft of the seat belt retractor, it may be necessary to deflect it so as to feed the seat belt at an angle that is favorable for restraining the occupant. The same problem arises if the seat belt retractor has to be fixed to a specific point for space reasons and the seat belt has to be conveyed over a longer distance before being deflected and guided to the occupant.

[0004] In this regard, seat-integrated seat belt devices (such as those provided in vehicle seats of convertibles, swivel seats, or bench seats) pose particular problems. The problem with such seat-integrated seat belt devices is that the space available in the vehicle seat is very limited. In addition, the restraint force from the seat belt retractor must be transmitted to the vehicle seat, and thus correspondingly dimensionally stable connection points must be provided on the vehicle seat, which complicates the possible mechanical connection of the seat belt retractor. This applies in particular to vehicle seats in which the seat belt retractor is not designed as an integral part of the vehicle seat, or to vehicle seats designed as bench seats (i.e., for example, two or three seats adjacent to each other).

[0005] Against this background, the object of the present invention is to specify a seat belt retractor for a vehicle seat and a vehicle seat comprising such a seat belt retractor, which enable the seat belt retractor to be mounted on or in the vehicle seat in a simple manner.

[0006] To achieve this object, a seat belt retractor having the features according to claim 1 and a vehicle seat having the features according to claim 15 are proposed. Further preferred embodiments and refinements can be found in the dependent claims, the drawings and the associated description.

[0007] To achieve this object, a seat belt retractor for fixing in and / or on the backrest of a vehicle seat is proposed, wherein the seat belt retractor comprises a housing in which a belt shaft is mounted so as to be rotatable about a rotational axis. The seat belt of the seat belt retractor can be wound onto the belt shaft to form a cylindrical belt winding portion, wherein the housing comprises two housing halves which at least partially radially surround the belt winding portion, and wherein at least one further functional module of the seat belt retractor is arranged in the housing along the rotational axis of the belt shaft, preferably coaxially with the rotational axis.

[0008] The proposed arrangement enables a seat belt retractor to be achieved which has a very small cross-sectional area perpendicular to the winding axis of the belt shaft, such that when the seat belt retractor is integrated into the backrest, the available space in the vehicle seat can be utilized as well as possible. This means, for example, that no additional form or thicker version of the backrest for accommodating the seat belt retractor is required. By arranging additional functional modules (such as a belt tensioner and a pretensioner) along the rotational axis (for example coaxially with the rotational axis), the circumference of the seat belt retractor around the winding axis can be reduced to the dimensions required for accommodating the belt winding portion or the wound seat belt.

[0009] According to a refinement, at least one housing half is proposed which has at least one partially cylindrical bulge radially towards the outside, the at least one partially cylindrical bulge being adapted to the belt winding portion.

[0010] This enables most of the seat belt retractor to be even narrower when the seat belt retractor extends along the rotational axis, wherein the seat belt retractor only has a greater width in the belt winding part for accommodating the wound seat belt. This enables a greater volume to be provided in the backrest of the vehicle seat, for example for mounting a seat cushion or a seat adjustment motor. Preferably, both housing halves have partially cylindrical bulges radially towards the outside. The bulges on one or both housing halves are preferably adapted to the contour of the belt winding portion such that the housing can be widened to a minimum extent to accommodate the belt winding portion.

[0011] In an advantageous embodiment, the housing forms a cubic interior which is enlarged by the bulge. The cubic interior between the housing halves is used to accommodate, hold and protect additional functional modules of the seat belt retractor. Additionally, in an advantageous embodiment, the cubic interior does not have an ideal cubic shape, but preferably has ribs and / or rounded or chamfered corners and / or edges.

[0012] Furthermore, it is proposed that the seat belt retractor has bearing plates along the axis of rotation on both sides of the belt winding section, and each of the bearing plates engages in at least one housing half. The bearing plates are designed to absorb the bearing forces of the belt shaft and introduce the bearing forces into the housing half. The absorbed forces can be transmitted from at least one housing half to the backrest of the vehicle seat.

[0013] Preferably, one of the bearing plates divides the interior of the housing into a belt winding chamber and a functional chamber, wherein the belt winding chamber and the functional chamber are arranged one after another along the axis of rotation of the belt shaft. The belt shaft is preferably guided from the belt winding chamber to the functional chamber through the bearing plate. By dividing the interior of the housing into a belt winding chamber and a functional chamber, the rigidity of the housing and the rigidity during the installation of the belt shaft can be improved. In addition, the entry of potential foreign objects along the belt path of the seat belt can be restricted to the belt winding chamber of the seat belt retractor.

[0014] Preferably, the housing has ribs extending parallel to the axis of rotation of the belt shaft. These ribs make the housing more rigid and can also improve the support of the bearing plates. This can, for example, improve the contact between the bearing plate and the housing in the case of optimized force transmission.

[0015] In a preferred embodiment, the housing has ribs arranged in a cross shape, preferably in the region of the functional chamber. The cross-shaped ribs can also make the housing more rigid in the housing region. This especially enables the improvement of the torsional performance and torsional rigidity of the housing, which is particularly advantageous for the coaxial arrangement of the belt shaft and the functional elements with a relatively long housing.

[0016] According to an improved form, the housing includes a mounting part and an interior part forming the interior, wherein the mounting part is flat and adjoins the parts of the interior part. Preferably, at least one housing half of the housing includes an integral mounting part and interior part. Thus, the mounting part does not form the boundary of the interior of the seat belt retractor, but is used to mount and fix the seat belt retractor in and / or on the backrest of the vehicle seat. One or both housing halves are preferably made of sheet metal.

[0017] According to an improved form, the mounting part is located in a common fixing plane. Thus, for example, the mounting part in the form of a flat part of one or two housing halves can preferably be located on both sides of the rotational axis with an axis in the common fixing plane. This enables the seat belt retractor to be easily mounted and fixed to the backrest of a vehicle seat and / or mounted and fixed in the backrest of a vehicle seat.

[0018] According to an advantageous improved form, the mounting part is located in the fixing plane together with the inner part. For example, one housing half can be plate-shaped, where the middle part forms the inner part. For example, the mounting part adjoins the inner part on two or more sides, where the inner part and the mounting part are located in the fixing plane such that the inner part can also abut against the rear part of the vehicle seat.

[0019] In an advantageous embodiment, the mounting part is formed as a single layer by one housing half or as two layers by two housing halves. Thus, the seat belt retractor can be fixed to the backrest of a vehicle seat and / or in the backrest by one or two housing halves. The double-layer mounting part consisting of two housing halves is particularly advantageous because the forces from the belt axis can be directly transmitted to the backrest via the two housing halves. In addition, the double-layer mounting part with two housing halves can enable the housing to be closed by a simple force fit, so that the process of fixing the seat belt retractor and the process of transmitting forces between the two housing halves can be integrated with each other.

[0020] In an advantageous embodiment, the mounting part has at least one interruption along the rotational axis of the belt axis. This enables the weight of the seat belt retractor to be reduced and the seat belt retractor to be more easily fixed to the vehicle seat and / or fixed in the vehicle seat.

[0021] It is further proposed that an upper mounting part is arranged above the inner part and a lower mounting part is arranged below the inner part, where the lower mounting part is wider than the upper mounting part. The upper mounting part is preferably located on one side of the outlet opening for the seat belt, while the lower mounting part is preferably located on the side away from the outlet opening. This enables the force flow to be optimized and thus a greater load-bearing capacity to be achieved. Particularly advantageously, the fixing projections and / or rivet nuts on the lower mounting part extend in a plane passing through the center of the belt winding part and / or the outlet opening. This can largely avoid introducing additional moments when a load is applied, and the forces from the seat belt can be easily transmitted to the seat structure.

[0022] According to another improved form, the seat belt is guided out of the seat belt retractor through the outlet opening, where at least three fixing projections are provided in the mounting part on the housing of the seat belt retractor for fixing in the backrest of a vehicle seat and / or on the backrest.

[0023] Fixing the seat belt retractor in and / or on the backrest refers to the orientation and position of the seat belt retractor housing. For example, when the seat belt retractor is fixed to the backrest and fixed in the backrest, the fixing protrusions of the seat belt retractor may be located on the back of the backrest, wherein when the seat belt retractor is fixed in the backrest, the housing of the seat belt retractor protrudes from the fixing protrusions into the backrest, and wherein when the seat belt retractor is fixed to the backrest, the housing of the seat belt retractor protrudes from the fixing protrusions outside the backrest. Thus, the proposed seat belt retractor also allows for a variety of fixing options in this regard. The fixing protrusions are preferably located in the mounting part of the housing or in the mounting parts of one or both of the housing halves.

[0024] Preferably, the housing halves are connected to each other by at least three rivet nuts, wherein the at least three rivet nuts form at least three fixing protrusions for fixing in and / or on the backrest of a vehicle seat.

[0025] Rivet nuts can be used to create fixing protrusions on the seat belt retractor in a simple manner, which enables easy installation and achieves good force transmission from the fixing protrusions to the housing of the seat belt retractor, in particular to at least two housing halves. The housing and the housing halves are preferably made of metal or metal alloy. In addition, the housing halves are preferably sheet metal parts. The housing preferably consists of two shell-shaped and / or lid-shaped housing halves, which are connected to each other by slotted nuts, while the rivet nuts simultaneously provide the fixing protrusions for fixing to the vehicle seat. Preferably, a simple threaded connection can be used to fix the seat belt retractor to the vehicle seat and / or in the vehicle seat using the rivet nuts. Since the fixing protrusions are designed with rivet nuts, the mechanical requirements for the vehicle seat to accommodate the seat belt retractor are reduced, and the number of options for positioning the seat belt retractor on the vehicle seat is increased.

[0026] Preferably, the rivet nut has a collar arranged on the housing half in the direction of the vehicle seat. The rivet nut is inserted into an opening in the housing half, preferably into a hexagonal opening, such that the collar of the rivet nut abuts the housing. In this case, the collar can simultaneously serve as a spacer element, thereby preventing the entire surface of the housing from abutting the backrest or the vehicle seat, thus reducing possible movement noises, such as squeaking sounds caused by relative movement under load.

[0027] In an advantageous embodiment, the housing halves are connected by at least one snap joint.

[0028] The riveted press joint is also known as a riveted connector and is particularly suitable for additionally connecting two housing halves made of sheet metal. This can, for example, further increase the rigidity and strength of the housing. The seatbelt retractor preferably has a plurality of press joints or riveted connectors. In addition, at least one additional press joint enables a particularly free choice of the position of the rivet nut in the form of a fixed projection on the housing of the seatbelt retractor, so that a particularly flexible connection can be achieved. Alternatively or in addition to the press joint, other mechanical connections such as welding, studs, rivets and / or gluing can also be used.

[0029] It is further proposed that the housing has two housing halves, which are connected to each other by at least one lock seam. The lock seam can, for example, extend over the entire length of the covering edge at the top edge and / or the bottom edge, in particular covering the mounting part. It is also possible in a further embodiment that the lock seam only extends over a short part (e.g. a sub-part) of the edge, in particular the mounting part.

[0030] In a further advantageous embodiment, the housing has at least two housing halves, which are connected by at least one riveted connector and a lock seam, whereby a particularly stable and reliable mechanical connection can be achieved.

[0031] Preferably, the seatbelt retractor includes a belt guiding element, which is inserted into one housing half of the housing and includes an outlet opening for the seatbelt.

[0032] The belt guiding element preferably closes the housing of the seatbelt retractor to such an extent that only the outlet opening for the seatbelt remains. The belt guiding element can in particular be used to prevent dirt from entering the seatbelt retractor. The outlet opening is preferably designed as a tunnel and further preferably has a flat rectangular cross-section. In addition, the outlet opening is preferably tubular, which also makes it more difficult for foreign objects and dirt to enter. The belt guiding element can be made of plastic, for example preferably by injection molding.

[0033] In an advantageous embodiment, the belt guiding element is inserted into the housing half transversely to the direction of departure of the seatbelt.

[0034] This enables easy installation and prevents potential loosening of the belt guiding element when the seatbelt is pulled out or retracted or under load, or prevents the guiding element from being pulled out together with the seatbelt.

[0035] According to an improved form, at least three fixed projections are located in a common fixing plane of the seatbelt retractor.

[0036] The common fixing plane makes it easier for the seat belt retractor to be structurally connected and mounted to the backrest of a single vehicle seat or to the backrest of a vehicle seat for two or three persons or to the backrest of a vehicle bench seat (especially a rear bench seat) for several persons. In addition, it is also easier to structurally connect, mount and fix the seat belt retractor in such a backrest. Starting from the fixing plane or from the edge or mounting part of at least two housing halves (which are preferably connected to each other by rivet nuts), the housing of the seat belt retractor can extend forward in the direction of the occupant on the vehicle seat or extend backward away from the occupant on the vehicle seat.

[0037] Furthermore, it is proposed that the outlet opening for guiding out the seat belt is configured to be parallel to the fixing plane. This enables good force transmission from the seat belt to the vehicle seat.

[0038] In addition, for this purpose, a vehicle seat having the features according to claim 12 is proposed. A vehicle seat is proposed, which vehicle seat includes a seat belt retractor according to any one of claims 1 to 11, wherein the vehicle seat has a backrest, and wherein the seat belt retractor is fixed in and / or on the backrest.

[0039] The corresponding vehicle seat enables the seat belt retractor to be integrated into the backrest of the vehicle seat, wherein this integration is not limited to fixing the seat belt retractor to the seat post, fixing it to the upper transverse member of the vehicle seat, or the seat belt retractor being the overall upper transverse member of the vehicle seat. Instead, the seat belt retractor can be mounted or fixed to the backrest largely freely in various positions. Thus, in possible embodiments, the seat belt retractor can be mounted on the backrest in various positions and, for example, covered by a cover body. In an alternative embodiment, the seat belt retractor can be integrated into the backrest at various points such that the backrest forms a closed surface and the seat belt retractor is embedded behind this closed surface. The vehicle seat preferably has fixing positions corresponding to the rivet nuts.

[0040] Preferably, the outlet opening of the seat belt retractor points upward. Upward here refers to the orientation of the vehicle seat in the vehicle such that the outlet opening preferably points in the direction of the upper end of the backrest. This means that the seat belt is pulled out directly. This enables the belt to be easily guided from the belt shaft without deflection, so that force transmission can be carried out easily parallel to the backrest and preferably parallel to the fixing plane. Particularly advantageously, the upward-pointing outlet opening is combined especially with a belt guiding element, so that particles can be effectively prevented from falling into the seat belt retractor.

[0041] According to an advantageous refinement, a vehicle seat has a seat belt deflector, with the seat belt being guided from a seat belt retractor parallel to the backrest to the seat belt deflector. The seat belt deflector in the vehicle seat is preferably fixed to and / or in the backrest separately from the seat belt retractor. By separating the seat belt deflector from the seat belt retractor (for example, for feeding the seat belt at the front side), the largely free positionability of the housing can be utilized particularly effectively, for example, by using rivet nuts as fixing projections. Thus, one or more seat belt retractors can be integrated into the backrest in a space-optimized manner. The seat belt deflector can be, for example, a loop on the vehicle seat, especially a loop on a lateral seat structure, and can also have an outlet hole for the seat belt.

[0042] In a preferred embodiment, the seat belt retractor and the seat belt deflector are spaced more than 10 cm apart. Thus, for a typical belt deflection with the seat belt retractor integrated into the backrest, it is not necessary to fix the seat belt retractor to the upper end of the backrest. Therefore, the seat belt retractor can be fixed to the lower region of the backrest, such that the backrest can be flatter in the upper region.

[0043] According to a refinement, the seat belt is guided directly out of the seat belt retractor from the belt shaft. Thus, preferably, no deflection occurs in the seat belt retractor, such that the seat belt can be guided out of the seat belt retractor without additional friction caused by deflection.

[0044] In a preferred embodiment, the seat belt retractor and the seat belt deflector are spaced more than 10 cm apart. Thus, in a typical belt guidance with the seat belt retractor integrated in the backrest, it is not necessary to fix the seat belt retractor to the upper end of the backrest; instead, the seat belt retractor can be fixed in the lower region of the backrest, which enables the backrest to be flatter in the upper region.

[0045] It is further proposed that the seat belt retractor is arranged in and / or on the backrest in the chest region or in and / or on the backrest in the pelvic region. This enables the seat belt retractor and the deflector to be functionally separated, which increases the design options for the vehicle seat and reduces the mechanical requirements for the fixing elements of the backrest that interact with the fixing projections of the seat belt retractor.

[0046] In an advantageous embodiment, three seat belt retractors for three occupants are arranged adjacent to each other on the backrest. This makes it easy to create the backrest of a vehicle bench seat with multiple seats that have integrated seat belt retractors.

[0047] According to an advantageous embodiment, it is proposed that the housing extends at least over half of the width of the backrest of the vehicle seat.

[0048] The present invention will now be explained with reference to the accompanying drawings using preferred embodiments:

[0049] Figure 1 is a front view of a seat belt retractor;

[0050] Figure 2 is a rear view of a seat belt retractor;

[0051] Figure 3 is an exploded view of the housing of a seat belt retractor including two housing halves and four slotted nuts;

[0052] Figure 4 is an exploded view of a seat belt retractor including a housing and a belt guiding element;

[0053] Figure 5 shows a seat belt retractor having an interruption in the mounting portion;

[0054] Figure 6 shows a vehicle seat including a seat belt retractor mounted on the backrest at chest height;

[0055] Figure 7 shows a vehicle seat including a seat belt retractor mounted on the backrest at pelvic height;

[0056] Figure 8 shows a vehicle seat including a seat belt retractor mounted in the backrest;

[0057] Figure 9 shows a vehicle seat in the form of a vehicle bench seat having three seats and three seat belt retractors mounted on the backrest at chest height;

[0058] Figure 10 shows a vehicle seat in the form of a vehicle bench seat having three seats and three seat belt retractors mounted on the backrest at pelvic height; and

[0059] Figure 11 shows a vehicle seat in the form of a vehicle bench seat having three seats and three seat belt retractors mounted in the backrest.

[0060] Figure 1is a front view of a preferred embodiment of the seat belt retractor 10. The seat belt retractor 10 has a belt shaft 12 (shown schematically) which is mounted for rotation about a rotational axis 25 and which, together with other functional modules 35 of the seat belt retractor 10 such as a locking element, a seat belt pretensioner etc., is arranged in a housing 11. The housing 11 has two housing halves 16, 17, Figure 1 in which an example shows the shell-shaped front housing half 16. The rear housing half 17 is shown in a rear view of the seat belt retractor 10 in Figure 2 and is designed to be similar to a cover. The front housing half 16 has ribs 36 which extend parallel to the rotational axis 25 of the belt shaft 12 and mounting portions 22 which overlap the rear housing half 17 at the top and bottom and which are connected in this preferred embodiment by four rivet nuts 18. In addition to mechanically connecting the two housing halves 16, 17, the rivet nuts 18 also serve as fixing projections 15 for fixing the seat belt retractor 10 to a vehicle seat 40; see also Figures 6 to 11 .

[0061] As can be seen in Figure 2 , the rivet nuts 18 are arranged in a common fixing plane 21. Thus, the rivet nuts 18 or the fixing projections 15 can be mounted particularly advantageously on a flat area of the vehicle seat 40. In this preferred embodiment, the housing half 17 has two ribs 36 which extend parallel to the rotational axis 25 of the belt shaft 24. Between these ribs 36, two pairs of intersecting ribs 37 are arranged, each of these ribs being at an angle, for example in the range from 20° to 70°, relative to the ribs 36.

[0062] The seat belt 13 is arranged on the belt winding portion 12 and is guided out of the seat belt retractor 10 in the exit direction 20. In this preferred embodiment, the seat belt 13 is guided by a plastic belt guide element 19 which has an exit opening 14 through which the seat belt 13 is guided out of the seat belt retractor 10.

[0063] Figure 3 is an exploded view of the housing 11 which includes the two housing halves 16 and 17. In addition, four rivet nuts 18 are shown which can be inserted into the mounting portion 22 or into the edges of the housing halves 16, 17 from the back of the seat belt retractor 10, from the side of the housing half 17.

[0064] As in Figure 3As can be seen in the exploded view, two housing halves 16, 17 form a cubic interior 28 extending along the axis of rotation 25. The interior 28 is formed by the interior portions 24 of the two housing halves 16, 17. In the region of the belt shaft 12, the seat belt 13 can be wound around the belt shaft to form a seat belt winding portion 26. The interior portions 24 of the two housing halves 16, 17 have partially cylindrical raised portions 27 that are adapted to the cylindrical shape of the seat belt winding portion 26.

[0065] Furthermore, in this advantageous embodiment, the housing 11 includes three bearing plates 29, 30, 31, two of which, 29, 30, are arranged on both sides of the belt winding portion 26 and axially enclose both sides of the belt winding chamber 32 along the axis of rotation 25 of the belt shaft 12. The bearing plate 30 divides the interior 28 of the seat belt retractor 10 into a belt winding chamber 32 and a functional chamber 33, in which, for example, a belt tensioner and / or additional functional modules 35 that can act on the belt shaft 12 can be arranged. The functional chamber 33 is axially enclosed by the bearing plate 31.

[0066] Figure 4 An exploded view showing the housing 11 and the belt guiding element 19 is presented, in which two housing halves 16, 17 are joined using four rivet nuts 18. As can be seen in Figure 4 the belt guiding element 19 has lateral guides 23 on both sides. In this advantageous embodiment, the belt guiding element 19 can be inserted into the housing 11 perpendicular to the exit direction 20 through the lateral guides. The belt guiding element 19 includes an exit opening 14 through which the seat belt 13 is guided during installation.

[0067] In a possible embodiment, in addition to being connected by the rivet nuts 18, the two housing halves 16, 17 are connected, for example, by a press fit or a riveted connection, which is preferably also arranged in the overlapping mounting portion 22 of the two housing halves 16, 17.

[0068] Figure 5 An embodiment of the seat belt retractor 10 is shown in an improved form, in which the mounting portion 22 of the housing 11 has an interruption 34. Figures 1 to 4

[0069] Figures 6 to 11 An embodiment of a vehicle seat 40 is shown, each vehicle seat in which includes a seat belt retractor 10 provided on the backrest 41.

[0070] Figure 6 ​An embodiment of a vehicle seat 40 is shown, which includes, for example, a seat belt retractor 10 that is fixed to the backrest 41 by a rivet nut 18. The seat belt retractor 10 is mounted on the backrest 41 at approximately the chest height of the occupant. In this embodiment, the seat belt retractor 10 is thus not mounted at the upper end of the backrest 41. The seat belt 13 that exits from the outlet opening 14 of the seat belt retractor 10 in the direction of the headrest 43 extends parallel to the backrest 41 until the seat belt deflector 42, which is arranged in the upper region of the backrest 41. Thus, the seat belt deflector 42 guides the seat belt 13 to the front part of the backrest 41 so that the occupant can fasten the seat belt 13. The seat belt 13 can be covered, for example, by an additional cover.

[0071] Figure 7 Another embodiment of the vehicle seat 40 is shown, in which, compared with Figure 6 the embodiment in, the seat belt retractor 10 is arranged in the lower region of the backrest 41 at the level of the occupant's pelvis. In this embodiment, the distance between the seat belt retractor 10 and the seat belt deflector 42 is significantly increased, so that the portion of the seat belt 13 guided in a manner parallel to the backrest 41 is longer, for example, more than 40 cm.

[0072] Figure 8 Another advantageous embodiment of the vehicle seat 40 including the seat belt retractor 10 is shown. Compared with Figure 6 and Figure 7 the embodiments in, the seat belt retractor 10 is fixed in the vehicle seat 40 in a different orientation, so that the housing 11 of the seat belt retractor 10 extends from the fixing protrusion 15 and enters the backrest 31.

[0073] Figure 9 An advantageous embodiment of the vehicle seat 40 including three seats adjacent to each other on a common bench seat is shown. Similar to Figure 6 the embodiment in, three seat belt retractors 10 are mounted adjacent to each other on the backrest 41 at approximately the chest height of the occupant in the upper region of the backrest 41. Thus, the three seat belts 13 are guided to the three seat belt deflectors 42 of the backrest 41.

[0074] Figure 10 Another embodiment of the vehicle seat 40 including three seats adjacent to each other on a common bench seat with a common backrest 41 is shown. Compared with Figure 9 the embodiment in, the seat belt retractors 10 are each arranged on the vehicle seat 40 at a greater distance from the seat belt deflectors 42. Thus, Figure 10 the embodiment in is similar to Figure 7 the embodiment in, where there is only one seat on the vehicle seat 40.

[0075] Figure 11 Another possible embodiment of the vehicle seat 40 is shown, which, compared with the embodiment in Figure 8 , has three seats for the occupants arranged adjacent to each other, and the three seats correspondingly include three seat belt retractors 10 arranged on the backrest 41.

Claims

1. A seat belt retractor (10) for being fixed in and / or on a backrest (41) of a vehicle seat (40), wherein the seat belt retractor (10) has a housing (11), a belt shaft (12) is rotatably mounted in the housing about a rotation axis (25), a seat belt (13) of the seat belt retractor (10) can be wound around the belt shaft into a cylindrical belt winding portion (26), wherein the housing (11) includes two housing halves (16, 17), the two housing halves at least partially radially surround the belt winding portion (26), and wherein at least one further functional module (35) of the seat belt retractor (10) is arranged in the housing (11) along the rotation axis (25) of the belt shaft (12), preferably coaxially with the rotation axis (25).

2. The seat belt retractor (10) according to claim 1, characterized in that, At least one housing half (16, 17) has at least one partially cylindrical bulge (27) adapted to the belt winding portion (26) radially towards the outside.

3. The seat belt retractor (10) according to claim 2, characterized in that, The housing (11) forms a cubic interior (28) enlarged by the bulge (27).

4. The seat belt retractor (10) according to any one of the preceding claims, characterized in that, The seat belt retractor (10) has bearing plates (29, 30, 31) along the rotation axis (25) on both sides of the belt winding portion (26), and each of the bearing plates engages in at least one housing half (16, 17).

5. The seat belt retractor (10) according to claim 4, characterized in that, One of the bearing plates (30) divides the interior (28) of the housing (11) into a belt winding chamber (32) and a functional chamber (33), wherein the belt winding chamber (32) and the functional chamber (33) are arranged one after another along the rotation axis (25) of the belt shaft (12).

6. The seat belt retractor (10) according to any one of the preceding claims, characterized in that, The housing (11) has ribs (36) extending parallel to the rotation axis (25) of the belt shaft (12).

7. A seat belt retractor (10) according to any one of the preceding claims, characterized in that, The housing (11) has ribs (37) preferably arranged in a cross shape in the region of the functional chamber (33).

8. A seat belt retractor (10) according to any one of the preceding claims, characterized in that, The housing (11) has a mounting portion (22) and an inner portion (24) forming the interior (28), wherein the mounting portion (22) is flat and adjoins parts of the inner portion (24).

9. The seat belt retractor (10) according to claim 8, characterized in that, The mounting portion (22) lies in a common fixing plane (21).

10. The seat belt retractor (10) according to claim 9, characterized in that, The mounting portion (22) and the inner portion (24) together lie in the fixing plane (21).

11. The seat belt retractor (10) according to any one of claims 8 to 10, characterized in that, The mounting portion (22) is formed by one housing half (16, 17) as a single layer, or by two housing halves (16, 17) as two layers.

12. The seat belt retractor (10) according to any one of claims 8 to 11, characterized in that, The mounting portion (22) has at least one interruption (34) along the rotation axis (25) of the belt shaft (12).

13. The seat belt retractor (10) according to any one of claims 8 to 12, characterized in that, An upper mounting portion (22) is arranged above the inner portion (24), and a lower mounting portion (22) is arranged below the inner portion, wherein the lower mounting portion (22) is wider than the upper mounting portion (22).

14. A seat belt retractor (10) according to any one of the preceding claims, characterized in that The seat belt (13) is guided out of the seat belt retractor (10) through the outlet opening (14), wherein at least three fixing protrusions (15) are provided in the mounting part (22) on the housing (11) of the seat belt retractor (10) for fixing in and / or on the backrest (41) of the vehicle seat (40).

15. A vehicle seat (40), said vehicle seat comprising a seat belt retractor (10) according to any one of claims 1 to 11, characterized in that, The vehicle seat (40) has a backrest (41), wherein the seat belt retractor (10) is fixed in and / or on the backrest (41).

16. The vehicle seat (40) according to claim 15, characterized in that, The seat belt retractor (10) is arranged in and / or on the backrest (41) in the chest area, or the seat belt retractor (10) is arranged in and / or on the backrest (41) in the pelvic area.

17. The vehicle seat (40) according to claim 15 or claim 16, characterized in that, Three seat belt retractors (10) for three occupants are arranged adjacent to each other on the backrest (41).

18. The vehicle seat (40) according to any one of claims 15 to 17, characterized in that, The housing (11) extends at least over half of the width of the backrest (41) of the vehicle seat (40).

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