Belt retractor for a safety belt device of a motor vehicle

Abstract

Belt retractor (1) for a safety belt device of a motor vehicle with -a rotatably mounted belt reel (5) on which a safety belt of the safety belt device can be wound, and -a reversible belt tensioner with a drive wheel (20) which drives the belt reel (5) in the winding direction when activated via the drive wheel (20), and -a positively controlled tensioning clutch transmitting the drive movement from the drive wheel (20) to the belt reel (5), with -at least one coupling pawl (21) mounted on the drive wheel (20), which can be moved into and out of engagement with a toothing (231) fixed to the belt reel in order to create and release a rotary connection of the drive wheel (20), and -a control element (22) with a control contour (223) for controlling the movement of the clutch pawl (21), wherein -a control pin (212) is provided on the coupling pawl (21), with which it slides on the control contour (223) of the control element (22), characterized in that -the coupling pawl (21) has a toothing which is aligned in such a way that the coupling pawl (21) is forced radially outwards from the toothing (231) fixed to the belt reel during a rotational movement of the toothing (231) fixed to the belt reel in the winding direction of the safety belt to a disengaging movement, wherein -the control contour (223) has a spring arm (228) fixed at one end to the control element (22), on which the coupling pawl (21) with the control pin (212) slides during the disengaging movement, starting from the fixed end to the free end, wherein -the control element (22) is forced to move relative to the control pin (212) by the pressure force exerted by the first control pin (212) on the spring arm (228), wherein -the control contour (223) on the control element (22) has a base surface (224) opposite the spring arm (228) with a locking contour (225), wherein -the locking contour (225) is arranged in such a way that the coupling pawl (21) is locked thereon with the control pin (212) during the relative movement of the control element (22) by exerting a clamping force of the spring arm (228) and is subsequently blocked against an engagement movement in the direction of the toothing (231) fixed to the belt reel.

Description

[0001] The present invention relates to a belt retractor for a safety belt device of a motor vehicle having the features of the preamble of claim 1.

[0002] Belt retractors are used in motor vehicle safety belt systems and are designed to wind up one end of a safety belt intended to restrain an occupant. The belt retractor is attached either to the vehicle structure or to a vehicle seat or bench seat attached to the vehicle structure. The basic design of the belt retractor comprises a frame for attachment and a belt reel mounted rotatably within the frame, with the safety belt being wound onto the reel.The belt reel is spring-loaded in the winding direction by a mainspring and can be blocked by a blocking device against further extension of the safety belt if a predetermined belt extension acceleration or vehicle deceleration is exceeded, so that the occupant is subsequently restrained from impact with the internal vehicle structure in order to avoid more serious injuries.

[0003] To reduce the occupant load during restraint, force-limiting devices have proven advantageous. These devices allow a force-limited rotation of the belt spool in the extension direction when the belt reel is blocked and a predetermined belt webbing extension force is exceeded, thus allowing a force-limited forward displacement of the occupant. Since the resulting reduction in occupant load is directly related to the available forward displacement travel, it has also proven advantageous to remove any slack in the seat belt using a belt tensioner before activating the force-limiting device in order to increase the available forward displacement travel and to couple the occupant to the vehicle's deceleration as early as possible.

[0004] A distinction is made between reversible belt pretensioners and irreversible belt pretensioners, or power pretensioners. Reversible belt pretensioners have a lower tensioning power of approximately 100 to 800 N and are used to remove slack in a dangerous situation in preparation for a possible subsequent accident. If no accident occurs, the seat belt is loosened again. Electric motors have proven to be particularly effective and reversible in driving reversible belt pretensioners. Irreversible belt pretensioners have a higher tensioning power of 400 to 2000 N and are only activated when an accident can no longer be avoided, i.e., in an early phase of the accident. Irreversible belt pretensioners are therefore always activated after reversible belt pretensioners.Pyrotechnic drives have proven to be effective as drives for the irreversible belt tensioners. Once activated, they cannot be reactivated, so that in this case the entire safety belt device with the irreversible belt tensioner must be replaced.

[0005] Belt tensioners can act on different parts of the seat belt, for example on the belt buckle, the end fitting or even on the belt retractor. When the belt tensioner is used on the belt retractor, when activated it suddenly drives the belt spool in the winding direction and in doing so removes any slack in the seat belt. For the purposes of the present invention, the term belt tensioner only refers to those which are arranged on a belt retractor and drive the belt spool. Since the belt spool must be able to rotate freely during normal use for buckling and unbuckling, the drives of both the reversible belt tensioner and the irreversible belt tensioner are only connected to the belt spool via couplings when activated.The couplings should be designed in such a way that they never inadvertently create a rotary connection, which would impede normal use of the belt retractor due to a resulting disruption of the rotary movement of the belt spool. For this purpose, the belt spool has a toothing fixed to the belt spool, into which the coupling engages with a clutch pawl to create a rotary connection between a drive wheel of the belt tensioner and the belt spool.

[0006] Since the reversible belt tensioner is to be deactivated again in the event that no subsequent accident occurs and the belt retractor is to be used normally again, the clutch of the reversible belt tensioner must also be designed to be reversible. Furthermore, the clutch of the reversible belt tensioner must also be deliberately disengaged if a subsequent accident occurs and the irreversible belt tensioner is activated, so that the drive movement of the irreversible belt tensioner is not disrupted by the clutch of the reversible belt tensioner, which is still engaged. To do this, the clutch pawl of the clutch must be moved from the engaged position into the toothing fixed to the belt spool back to the disengaged position of the toothing fixed to the belt spool.

[0007] Furthermore, the clutches of the various belt tensioners must be designed in such a way that they automatically establish the rotary connection between the drive and the belt reel when the drive is activated, which can be achieved, for example, by friction, inertial forces, or even by a control contour. The movement of the clutch is thus positively controlled by the initial movement of the drive.

[0008] This means that the couplings are required, on the one hand, to carry out the coupling movement automatically when the drive device is activated, but under other circumstances they should deliberately not carry out the coupling movement in order to avoid an unwanted coupling connection.

[0009] For example, the applicant's patent document DE 100 59 227 C1 discloses a belt retractor with a reversible belt tensioner, which has a friction-controlled clutch with a clutch pawl and a braking element. The clutch pawl is slidably mounted on the drive wheel and, to establish a clutch connection, engages an internal toothing of a clutch bell that is non-rotatably connected to the belt shaft.

[0010] Furthermore, DE 10 2014 009 038 B4 discloses a clutch for a belt tensioner. This clutch has two clutch pawls mounted on a drive wheel, referred to there as input elements, which engage the external toothing of an output element connected to the belt reel to establish the clutch connection. To control the movements of the clutch elements, a control element coupled to an inertial mass is provided, on which a control contour with an input geometry and an output geometry is provided to control the movements of the clutch pawls.

[0011] Since the activation of the irreversible belt tensioner with its considerably higher tensioning power compared to the reversible belt tensioner results in extremely high rotational acceleration and rotational speeds of the belt reel, there is still a risk that under extreme conditions the coupling pawl may unintentionally re-engage with the toothing fixed to the belt reel when the irreversible belt tensioner is activated, and the coupling connection may thus be unintentionally re-established.

[0012] To solve this problem, it is known from DE 10 2006 002 540 B3 to provide a spring-loaded locking element on the drive wheel, to which the clutch pawl engages via an undercut-like recess. This positively secures the clutch pawl following its reversing movement, preventing it from re-engaging with the belt shaft following the reversing movement.

[0013] Against this background, the invention is based on the object of providing a belt retractor of the generic type in which an unwanted engagement movement of the coupling pawl after reversible belt tensioning has taken place during irreversible belt tensioning is reliably prevented.

[0014] To achieve this object, a belt retractor having the features of claim 1 is proposed. Further preferred embodiments of the invention can be found in the subclaims, the figures and the associated description.

[0015] According to the basic idea of ​​the invention, a belt retractor with the features of the preamble of claim 1 is proposed, in which the coupling pawl has a toothing which is oriented such that the coupling pawl is forced radially outwards from the toothing fixed to the belt spool during a rotational movement of the toothing fixed to the belt spool in the winding direction of the safety belt to a disengaged movement, wherein the control contour has a spring arm fixed at one end to the control element, on which spring arm the coupling pawl slides with the control pin during the disengaged movement, starting from the fixed end to the free end, wherein the control element is forced into a relative movement with respect to the control pin by the pressure force exerted by the first control pin on the spring arm, wherein the control contour on the control element has a base surface opposite the spring arm with a locking contour,wherein the locking contour is arranged in such a way that the coupling pawl is locked to the control pin during the relative movement of the control element by exerting a clamping force of the spring arm and is subsequently blocked against an engagement movement in the direction of the toothing fixed to the belt reel.

[0016] The proposed solution prevents an unintentional, repeated engagement movement of the clutch pawl into the toothing fixed to the belt reel by a simple locking movement of the control pin, utilizing the control contour of the control element. The clutch pawl is blocked against repeated engagement movement via the control pin in the locked position. The proposed solution makes the locking of the clutch pawl independent of the acting circumferential forces resulting from the rotational movements and rotational accelerations of the belt reel, the drive wheel, and the clutch pawl, so that the clutch pawl is reliably blocked against repeated engagement movement even under extreme acceleration.The locking contour forms a positive support of the control pin and thus of the clutch pawl towards the radial inside, on which the clutch pawl is supported even when small radially inward forces are still present.

[0017] It is further proposed that the spring arm and the base surface define a guide groove of the control contour on the control element, extending at least partially in the circumferential direction, into which the clutch pawl engages with the control pin. The guide groove improves the control of the movement of the clutch pawl via the engaging control pin, with the movement path of the clutch pawl being predetermined by the course of the guide groove in conjunction with the rotational movement of the drive wheel and / or the belt reel with the toothing fixed to the belt reel.

[0018] It is further proposed that the spring arm delimits the guide groove radially outwards at least in one blocking section and the base surface delimits the guide groove radially inwards in at least one blocking section, wherein the locking contour is arranged in the blocking section. The blocking section of the guide groove with the locking contour arranged therein improves the guidance of the movement of the clutch pawl, particularly during the blocking movement of the clutch pawl in the early phase of activation of the irreversible belt tensioner. In addition, the deliberately induced relative movement of the control element with respect to the control pin is enforced in an improved manner. The spring arm forms the radially outer guide and the base surface the radially inner guide, which then, due to the locking contour provided thereon, simultaneously forms the abutment for the control pin pressed against by the spring arm in the blocked position of the control pin.

[0019] It is further proposed that the guide groove have a radially inwardly directed guide section in which the control pin is guided to control the engagement movement of the clutch pawl into the toothing fixed to the belt spool. The guide groove is thus used, through the formation of the radially inwardly directed guide section, additionally to control the engagement movement of the clutch pawl into the toothing fixed to the belt spool at the beginning of the activation of the reversible belt tensioner, wherein the engagement movement is defined by the course of the guide section in combination with the rotational movement of the drive wheel upon activation of the reversible belt tensioner.

[0020] It is further proposed that the locking contour include a locking edge, which the control pin passes as it slides onto the spring arm. This locking edge further assists in blocking the control pin and thus the clutch pawl against a backward radially inward pivoting movement and thus against repeated engagement, since the locking edge must also be overcome during such a backward movement.

[0021] It is further proposed that the locking edge be arranged such that the control pin overcomes the locking edge by utilizing a spring movement of the spring arm. The locking edge further enforces the spring movement of the spring arm, and the spring arm is essentially preloaded by overcoming the locking edge before it pushes the control pin into the locking contour. By preloading the spring arm, the control pin is then pushed into the locking contour with increased spring force after passing the locking edge.

[0022] It is further proposed that the locking contour additionally forms a stop that limits the movement of the control pin in the direction of rotation of the belt reel in the winding direction of the seat belt. The locking contour is thus also used to limit the circumferential movement of the control pin. Since the control pin always performs a combination of a radial movement and a circumferential movement when pivoting the coupling pawl, the circumferentially directed stop of the locking contour additionally forms a stop for the pivoting movement of the control pin and thus of the coupling pawl as a whole. Furthermore, this blocks any further relative movement of the control element to the coupling pawl and the control pin in this direction.

[0023] It is further proposed that the control element comprise a control plate and a spring washer, wherein the control contour is arranged on the control plate, and the control plate is frictionally secured relative to a belt tensioner housing via the spring washer. The control plate forms the control contour for the control pin and thus for the clutch pawl, while the spring washer forms the frictional connection with the belt tensioner housing, which enables the required relative movement of the control element to the clutch pawl once a frictional force has been overcome.

[0024] It is further proposed that the control contour be formed by at least one recess and / or at least one elevation on the control plate. The recess and / or elevation form a contact surface on the control plate against which the control pin rests, so that its movement is controlled by a positive engagement with the control contour.

[0025] It is further proposed that the locking contour have a negative shape corresponding to the outer shape of the cross-section of the control pin. Due to the negative shape of the locking contour, the control pin comes into contact with the locking contour as flatly as possible. The control pin preferably has a circular outer shape in cross-section, and the corresponding negative shape of the locking contour can preferably be formed by a partially circular shape with an identical radius.

[0026] The invention will be explained below using preferred embodiments with reference to the attached figures. Fig. 1: a belt retractor according to the invention with a reversible belt tensioner; and Fig. 2 a drive wheel with a tensioner clutch for transmitting the rotational movement of the reversible belt tensioner; and Fig. 3 and Fig. 4: the drive wheel, the clutch pawl and the belt reel-fixed toothing in the disengaged position of the clutch pawl with and without cover plate; and Fig. 5: the control element with the clutch pawl in the disengaged position; and Fig. 6 and Fig. 7: the drive wheel, the clutch pawl and the belt reel-fixed toothing in the engaged position of the clutch pawl with and without cover slide; and Fig. 8: the control element with the clutch pawl in the engaged position; drive wheel, the clutch pawl and the belt reel-fixed toothing in the position of the first contact during the engagement movement; and Fig. 9: the control element with the clutch pawl in an intermediate position in an early phase of activation of the pyrotechnic belt tensioner; Fig. 10: the control element with the clutch pawl in a blocked position during activation of the pyrotechnic belt tensioner;

[0027] In the Fig. 1 shows a belt retractor 1 according to the invention with a reversible belt tensioner 3, a drive wheel 20, a tensioner clutch 2, and a winding unit 4. The winding unit 4 comprises, as basic components, a belt reel 5 rotatably mounted in a frame 6 with an axial extension 8 and an irreversible pyrotechnic belt tensioner 7 or power tensioner.

[0028] The reversible belt tensioner 3 is activated in pre-accident situations and serves to tighten the seat belt in preparation for a potential accident. The seat belt is tightened with a tensile force of 100 to 800 N. The tensioning force can be selected at different levels according to the vehicle manufacturer's specifications or can be designed in a graduated manner with an increase in tension depending on various pre-accident criteria.

[0029] The irreversible belt tensioner 7 is only activated when the accident can no longer be avoided, or when it has just begun, and causes a greater increase in the tensile force in the safety belt of 400 to 2000 N compared to the increase in tensile force when the reversible belt tensioner 3 is activated. Accordingly, the belt spool 5 is driven with a considerably greater torque and a higher rotational acceleration when the irreversible belt tensioner 7 is activated than when the reversible belt tensioner 3 is activated.

[0030] The reversible belt tensioner 3 comprises an electric motor and a belt tensioner housing with a gear mounted therein, which transmits the drive rotational movement of the electric motor to the drive wheel 20.

[0031] On the extension 8 of the belt reel 5 there is a Fig. 2, is held in a rotationally fixed manner. The toothed ring 23 has a radially outer toothing, which, in the fastened position of the toothed ring 23 on the extension 8, forms a toothing 231 fixed to the belt reel.

[0032] The drive wheel 20 of the reversible belt tensioner 3 is rotatably mounted on the belt tensioner housing. For this purpose, the belt tensioner housing has an annular axial extension on which the drive wheel 20 is mounted. Furthermore, a control element 22 with a spring ring 221 and a control plate 222 fixed by the spring ring 221 is provided. The control element 22 is frictionally secured by the spring ring 221 to an axial extension of the belt tensioner housing, which can be the extension for supporting the drive wheel 20, but does not have to be. Furthermore, a clutch pawl 21 is provided, which is arcuately shaped and has a bearing pin 211 projecting on both sides at one of its ends. Furthermore, the clutch pawl 21 has a toothing on its radially inner side.Furthermore, an annular cover plate 24 with a bearing opening 241 is provided, in which the clutch pawl 21 is mounted on one side with the bearing pin 211, while the bearing pin 211 engages with its other side in a not visible bearing opening of the drive wheel 20. Thus, the clutch pawl 21 is pivotally mounted on both sides in the drive wheel 20 and on the cover plate 24.

[0033] In the Fig. 3 and Fig. 4, the drive wheel 20 with the toothed ring 23 and the coupling pawl 21 can be seen with and without the cover slide 24 in a position in which the coupling pawl 21 does not engage with the toothing 231 of the toothed ring 23, which is fixed to the belt spool. This position thus corresponds to the position of the coupling pawl 21 before the activation of the reversible belt tensioner 3. Since the coupling pawl 21 does not engage with the toothing 231, which is fixed to the belt spool, the belt spool 5 can rotate freely relative to the drive wheel 20 and the coupling pawl 21.

[0034] In the Fig. 5, the control element 22 is connected to the coupling pawl 21 in the Fig. 3 and Fig. 4 shows the position of the clutch pawl 21 without the drive wheel 20 and without the toothed ring 23. On the control plate 222 of the control element 22, a control contour 223 is provided, which is formed by a guide groove 227. The guide groove 227 is an arcuate, continuous recess in the control plate 222. The guide groove 227 is further delimited radially outwardly by a spring arm 228 and radially inwardly by a base surface 224 of the control plate 222. The spring arm 228 is firmly connected to the control plate 222 at its end facing the end of the guide groove 227 and can therefore execute radially directed spring movements with its free end, during which the width of the guide groove 227 increases or decreases.

[0035] However, it is also conceivable, instead of or in addition to the guide groove 227 in the form of the recesses, to provide as the control contour 223 a geometry consisting of one or more elevations on the control plate 222, against which the coupling pawl 21 rests with the control pin 212 described in more detail below.

[0036] Starting from its right-hand end in the illustration, the guide groove 227 comprises a radially inwardly directed guide section 300, which merges into a radially outwardly directed blocking section 229. The clutch pawl 21 has a control pin 212 with which it engages in the guide groove 227, while at the same time being pivotally mounted on the drive wheel 20 and the cover slide 24 via the bearing pin 211.

[0037] As in the Fig. 5, the coupling pawl 21 engages in the disengaged position from the toothing 231 fixed to the belt reel according to the Fig. 3 and Fig. 4, the control pin 212 engages in the radially outer right-hand end of the guide section 300 of the guide groove 227. If the belt tensioner 3 is activated in this position of the clutch pawl 21, the drive wheel 20 and thus also the clutch pawl 21 are moved in accordance with the Fig. 3 to 5. Since the control element 22 remains behind the drive wheel 20 and the clutch pawl 21 due to the frictional fastening to the belt tensioner housing and is not driven, the clutch pawl 21 with the control pin 212 performs a movement in the guide section 300 up to the Fig. 6 to 8. Since the guide section 300 of the guide groove 227 is directed radially inward, the coupling pawl 21 is pivoted radially inward. During this pivoting movement, the coupling pawl 21 engages with its toothing in the toothing 231 of the toothed ring 23, which is fixed to the belt reel, and thereby establishes a rotationally fixed connection between the drive wheel 20 and the belt reel 5 in the winding direction of the belt reel 5. To cancel the rotationally fixed connection, if no accident occurs after the activation of the reversible belt tensioner 3, the drive wheel 20 is driven for a short angle of rotation in the opposite direction, and the coupling pawl 21 is moved in a reverse movement sequence out of the toothing 231, which is fixed to the belt reel, into the disengaged position according to the Fig. 3 to 5 swiveled.

[0038] If, however, the pyrotechnic belt tensioner 7 is activated in the engaged position of the coupling pawl 21 and an accident occurs at this time, the belt reel 5 is driven to a considerably higher rotational speed in the winding direction of the safety belt. This moves the toothed ring 23 with the toothing 231 fixed to the belt reel into the Fig. 6 to 8. The coupling pawl 21 is pushed radially outward by the toothing 231, which slides along the teeth of the coupling pawl 21, without the control element 22 moving. As a result, the coupling pawl 21, with the control pin 212, moves radially outward into the blocking section 229 of the guide groove 227, as shown in Fig.9. During this radially outward movement of the control pin 212, it passes a locking edge 226 of the base surface 224 and comes to rest against a pressure surface 301 of the spring arm 228, which is oriented approximately orthogonally with respect to the radial movement of the control pin 212. During the further radial movement of the control pin 212 or the coupling pawl 21, the control pin 212 overcomes the locking edge 226, and the spring arm 228 is simultaneously elastically tensioned by a radially outward movement. The base surface 224 is formed, adjacent to the locking edge 226, as a locking contour 225 in the form of a part-circular concave groove with a radius that corresponds to the outer radius of the cross section of the control pin 212.After overcoming the locking edge 226, the coupling pawl 21 with the control pin 212 is forced into the locking contour 225 by the spring force exerted by the tensioned spring arm 228 and is then blocked by the locking contour 225 and the locking edge 226 against a backward pivoting movement in the direction of the toothing 231 fixed to the belt reel. In this case, the control element 22 executes a circumferentially directed relative movement to the control pin 212, forced by the spring movement of the spring arm 228, through which the control pin 212 moves into the blocked position. The locking contour 225 additionally forms a stop which limits the relative movement of the control element 22 to the control pin 212 and the coupling pawl 21 in the circumferential direction.

[0039] The coupling pawl 21 is thus subsequently blocked against unintentional engagement with the toothing 231 fixed to the belt reel due to the radially inner support by the locking contour 225 and the locking edge 226, in particular independently of the high circumferential forces and circumferential accelerations acting on the belt reel 5 during the pyrotechnic tensioning process.

Claims

[1] Belt retractor (1) for a safety belt device of a motor vehicle with -a rotatably mounted belt reel (5) on which a safety belt of the safety belt device can be wound, and -a reversible belt tensioner with a drive wheel (20) which drives the belt reel (5) in the winding direction when activated via the drive wheel (20), and -a positively controlled tensioning clutch transmitting the drive movement from the drive wheel (20) to the belt reel (5), with -at least one coupling pawl (21) mounted on the drive wheel (20), which can be moved into and out of engagement with a toothing (231) fixed to the belt reel in order to create and release a rotary connection of the drive wheel (20), and -a control element (22) with a control contour (223) for controlling the movement of the clutch pawl (21), wherein -a control pin (212) is provided on the coupling pawl (21), with which it slides on the control contour (223) of the control element (22), characterized by , that -the coupling pawl (21) has a toothing which is aligned in such a way that the coupling pawl (21) is forced radially outwards from the toothing (231) fixed to the belt reel during a rotational movement of the toothing (231) fixed to the belt reel in the winding direction of the safety belt to a disengaging movement, wherein -the control contour (223) has a spring arm (228) fixed at one end to the control element (22), on which the coupling pawl (21) with the control pin (212) slides during the disengaging movement, starting from the fixed end to the free end, wherein -the control element (22) is forced to move relative to the control pin (212) by the pressure force exerted by the first control pin (212) on the spring arm (228), wherein -the control contour (223) on the control element (22) has a base surface (224) opposite the spring arm (228) with a locking contour (225), wherein -the locking contour (225) is arranged in such a way that the coupling pawl (21) is locked thereon with the control pin (212) during the relative movement of the control element (22) by exerting a clamping force of the spring arm (228) and is subsequently blocked against an engagement movement in the direction of the toothing (231) fixed to the belt reel. [2] Belt retractor (1) according to claim 1, characterized by , that -the spring arm (228) and the base surface (224) delimit a guide groove (227) of the control contour (223) on the control element (22), which guide groove extends at least partially in the circumferential direction and into which the coupling pawl (21) engages with the control pin (212). [3] Belt retractor (1) according to claim 2, characterized by , that -the guide groove (227) has at least one blocking section (229) which is limited radially outwards by the spring arm (228) and radially inwards by the base surface (224), wherein -the locking contour (225) is arranged in the blocking section (229). [4] Belt retractor (1) according to claim 2 or 3, characterized by , that -the guide groove (227) has a radially inwardly directed guide section (300) in which the control pin (212) for controlling the engagement movement of the coupling pawl (21) is guided into the toothing (231) fixed to the belt reel. [5] Belt retractor (1) according to one of claims 1 to 4, characterized by , that -the locking contour (225) has a locking edge (226) which the control pin (212) passes while sliding on the spring arm (228). [6] Belt retractor (1) according to claim 5, characterized by , that -the locking edge (226) is arranged such that the control pin (212) overcomes the locking edge (226) by utilizing a spring movement of the spring arm (228). [7] Belt retractor (1) according to one of claims 1 to 6, characterized by , that -the locking contour (225) additionally forms a stop limiting the movement of the control pin (212) in the direction of rotation of the belt reel (5) in the winding direction of the safety belt. [8] Belt retractor (1) according to one of claims 1 to 7, characterized by , that -the control element (22) comprises a control plate (222) and a spring ring (221), wherein -the control contour (223) is arranged on the control plate (222) and the control plate (222) is frictionally secured relative to a belt tensioner housing via the spring ring (221). [9] Belt retractor (1) according to claim 8, characterized by , that -the control contour (223) is formed by at least one recess and / or at least one elevation on the control plate (222). [10] Belt retractor (1) according to one of claims 1 to 9, characterized by , that -the locking contour (225) has a negative shape corresponding to the outer shape of the cross section of the control pin (212). [11] Belt retractor according to claim 10, characterized by , that -the control pin (212) has a circular outer shape in cross-section, and the corresponding negative shape is formed by a part-circular shape with an identical radius.

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