CN210116475U - Belt retractor and belt device for a motor vehicle - Google Patents

Abstract

The utility model relates to a safety belt coiler and safety belt device for motor vehicle. The seatbelt retractor includes a spindle (1), a bracket (4), a vehicle sensing device (6), a locking mechanism (100), and a restraining mechanism (200). The suppression mechanism comprises a reduction mechanism having an input element (7) which is connected in a rotationally fixed manner to the spindle, and an output element (8) which has a running surface. The restraining mechanism comprises a driven member (10), a restraining member (11.1) and a return spring (11). In a predetermined rest position of the spindle, the working surface of the output element manipulates the follower such that the restraining member is in a position to restrain the movable member. The restraining member leaves a position to restrain the movable member after a predetermined rotational stroke of the spindle in an unwinding direction. The safety belt retractor is simple in structure, small in number of parts and high in robustness.

Description

Belt retractor and belt device for a motor vehicle

Technical Field

The present invention relates to the field of motor vehicle safety technology, and more particularly, to a seat belt retractor for a motor vehicle and a seat belt device comprising such a seat belt retractor.

Background

In motor vehicles, safety belt devices are an important component of occupant restraint systems, and in particular in the event of a traffic accident, they can provide protection for the occupants from injury or minimize injury. With the development and progress of automotive technology, the desire and demand for ride comfort of automobiles is higher and higher. In particular, with regard to noise in the interior of the motor vehicle, a quietness which is as high as possible is desirable when the motor vehicle is in operation. The seat belt retractor may have a vehicle-sensing device which may include metal parts that may collide with each other when the vehicle is running due to factors such as an uneven road surface, which causes a certain noise. In particular, when the seat belt retractor is installed in the motor vehicle in the region close to the human ear, the noise caused by the vehicle-sensing device is disturbing for the occupant, which adversely affects the ride comfort.

A plurality of seat belt devices are usually provided in a motor vehicle. However, not all the seatbelt apparatuses are used at the same time. For the unused seat belt devices, measures can be taken to suppress the vehicle-feel devices of the respective seat belt device in order to reduce or even eliminate the noise caused by the respective vehicle-feel devices.

Patent document CN1754724B describes a seatbelt retractor having a vehicle sensing device and a restraining mechanism. In the motor vehicle, the restraining mechanism can restrain the vehicle-sensing device when the seatbelt device is not used, so that mutual collision of parts of the vehicle-sensing device can be avoided. In such a prior art seatbelt retractor, the restraining mechanism has many parts which are skillfully designed so as to be able to be assembled and fitted to each other. The safety belt retractor has the advantages of more parts, more complex assembly and improved stability.

SUMMERY OF THE UTILITY MODEL

The object of the present invention is to provide a belt retractor for a motor vehicle and a belt device comprising such a belt retractor, wherein the belt retractor has a simpler structure and a smaller number of parts and is assembly-friendly while enabling noise reduction.

According to a first aspect of the present invention, a belt retractor for a motor vehicle is proposed, comprising:

a support;

a spindle rotatably supported in the bracket and biased in a take-up direction;

a locking mechanism configured for, in an activated state, locking the spindle in an unwinding direction and, in a deactivated state, releasing the spindle;

a vehicle sensing device configured to sense a safety-related operating condition of a motor vehicle, the vehicle sensing device having a movable component; and

a damping mechanism comprising a reduction mechanism having an input element and an output element, the input element being connected to the mandrel in a rotationally fixed manner;

the output element has a working face;

the restraining mechanism includes a follower that is manipulable by a working surface of the output element, a restraining member that is kinematically coupled with the follower, and a return spring that biases the follower in a direction causing the restraining member to release the movable member;

wherein, in a predetermined rest position of the mandrel, the working surface of the output element manipulates the follower such that the inhibiting means is in a position to inhibit the movable means;

wherein, in an unwinding direction, after a predetermined rotational stroke of the spindle from the rest position, the restraining member leaves a position that restrains the movable member.

The beneficial technical effects of the utility model reside in that, in the safety belt retractor according to the utility model, for example compare with aforementioned prior art, can save an solitary cam disc for it is consequently also possible, make other parts that are used for restraining the vehicle to feel the suppression mechanism of function of device is felt to the vehicle can constitute more simply, and the assembly operation that is relevant with the suppression mechanism can be friendlier, consequently also makes the safety belt retractor in the robustness of during operation improved.

Vehicle sensing devices and locking mechanisms for seat belt retractors are known in the art. The relevant prior art can be found, for example, in patent documents EP2621767B1 and CN104755331A and in the aforementioned patent document CN 1754724B.

The vehicle sensing device may, for example, sense any one or more of the following operating parameters of the motor vehicle: the longitudinal acceleration, the longitudinal deceleration, the pitch angle, the roll angle, the centrifugal acceleration, the yaw rate of the vehicle or a plurality of operating parameters can be sensed in combination, for example a resulting acceleration of the vehicle can be sensed.

The movable part of the ride-sensing device may comprise, for example, a sensor ball capable of rolling in a dimple, or a roller capable of rolling in a race, or a slider capable of sliding on a sliding surface, or a swinging element having a predetermined inertia, or the like.

In some embodiments, the output element may have an integrated flange, the outer circumferential surface of which constitutes the working surface. In some further embodiments, the working surface can be formed by a curved planar element integrated with the output element. The flange can be formed integrally with the output element, for example, by injection molding. In other embodiments, the flange and the output element can first be produced separately and then fixed together in a material-locking manner, for example by gluing or welding.

In some embodiments, the follower disengages from the working surface of the output member after a predetermined rotational stroke of the mandrel in the unwinding direction.

In some embodiments, after a predetermined rotational stroke of the spindle in the unwinding direction, the follower may continue to rest on the working surface of the output element, at which point the corresponding section of the working surface presses the follower to a reduced extent, so that the restraining member leaves the position restraining the movable member.

In the mounted state of the belt retractor in the motor vehicle, the spindle can have a rest position in which the belt arrangement with the belt retractor and the webbing is not used.

In some embodiments, the reduction mechanism can be designed as a wobble mechanism comprising an eccentric as an input element, which is connected in a rotationally fixed manner to the spindle, a wobble gear as an output element, and a stationary ring gear, the wobble gear being supported eccentrically by the eccentric with respect to the axis of rotation of the spindle, and the wobble gear meshing with the ring gear. In further embodiments, the reduction mechanism may be configured as a spur gear mechanism or a planetary gear mechanism.

In some embodiments, the restraining mechanism may have a trigger disk, which may have a recess, which is rotatably supported and which can be rotated against a resistance. The resistance may be, for example, a friction force, a spring force, or an electromagnetic force.

In some embodiments, the output element may have a drive projection that extends into the recess and is freely movable between two ends of the recess.

In some embodiments, the drive projection may be configured as a drive pin.

In some embodiments, the drive projection may be provided on an axial end face of the flange.

In some embodiments, the trigger plate may have a working surface, and the working surface of the trigger plate may be configured to support the follower when the follower is disengaged from the working surface of the output member.

In some embodiments, the follower may have a stop element, the working face of the trigger plate may have a recess, the working face of the trigger plate and the stop element may be configured to:

-after a predetermined rotational stroke of the spindle in the unwinding direction and before a predetermined maximum unwinding position of the spindle, the follower is supported outside the recess on the working face of the trigger plate, the stop element being inactive; and is

In the maximum unwinding position of the spindle, the follower is supported in the recess, the stop element causing the activation of the locking mechanism.

In some embodiments, the stop element can be designed as a pawl.

In some embodiments, the follower may be configured as a pivotably supported follower. In other embodiments, the follower may be configured as a linearly movable follower.

In some embodiments, the follower may have a support arm configured to rest on a working surface of the output element.

In some embodiments, in the predetermined rest position of the spindle, the support arm rests on the working surface of the output element in a region adjacent to the end of the working surface of the output element which is located forward in the unwinding direction. The working face can thus be designed compactly.

In some embodiments, the follower may have a support arm configured for resting on a working surface of the output element and for resting on a working surface of the trigger plate.

In some further embodiments, the follower can have two support arms, wherein one support arm is configured for resting on the working surface of the output element and the other support arm is configured for resting on the working surface of the trigger plate.

In some embodiments, the suppression component may be an integral, resilient component of the follower, or the suppression component may be configured as a cantilevered portion of the return spring.

In some embodiments, the seatbelt retractor may have a side cover fixed to the bracket.

In some embodiments, the side cover may have a bottom surface and a protrusion extending from the bottom surface, the input element being rotatably supported on the protrusion.

In some embodiments, the input element may have a first snap element and the protrusion may have a second snap element, the first and second snap elements forming a snap connection such that the input element and the protrusion are mutually fixed in the axial direction.

In some embodiments, the input element may have a flange surface, and the output element is supported on the flange surface of the input element in the axial direction.

In some embodiments, the trigger disk is rotatably supported on the protrusion.

In some embodiments, the trigger plate may be pressed against the bottom surface such that the trigger plate is rotatable relative to the bottom surface against a frictional force.

In some embodiments, the trigger disk may be pressed against the bottom surface by a plurality of springs. In other embodiments, the trigger disk may be pressed against the bottom surface by a spring collar. In other embodiments, the trigger disk can be pressed against the outer circumference by a friction element, as a result of which a friction force can be generated between the trigger disk and the friction element.

In some embodiments, the output element presses the trigger disk against the bottom surface via a flange surface of the input element and the snap connection.

In some embodiments, the protrusion may have a first shaft section spaced from the bottom surface and a second shaft section adjacent to the bottom surface, the trigger disk being rotatably mounted on the second shaft section, the first snap element surrounding the first shaft section, the second snap element being disposed on an end of the protrusion.

In some embodiments, the toothed ring can be connected to the side cover in a rotationally fixed manner, for example both can be integrally molded by injection molding.

In the sense of the present invention, "two components are connected in a rotationally fixed manner" means that they cannot rotate relative to one another about an axis of rotation and that they can be or cannot be moved relative to one another along the axis of rotation. "two components are rotationally fixedly connected" may include, but is not limited to: the two parts are integrally formed with each other; the gear is sleeved on a shaft with a non-circular cross section and can move on the shaft; the two parts are fixedly connected. In this context, "two parts are connected in a rotationally fixed manner" is intended to include the following: due to manufacturing tolerances or the presence of unintentional play, the two parts can rotate slightly relative to each other.

In the sense of the present invention, "two parts are rotatably connected" means that they can be rotated relative to each other about an axis of rotation.

In some embodiments, the seat belt retractor may have a combination of the following features:

the reduction gear mechanism is designed as a wobble gear mechanism, which comprises an eccentric as an input element, which is connected in a rotationally fixed manner to a spindle, a wobble gear as an output element, and a toothed ring, which is mounted eccentrically by means of the eccentric with respect to the axis of rotation of the spindle and which meshes with the toothed ring, the wobble gear having an integrated sector-shaped flange, the outer circumferential surface of which flange forms the running surface, the wobble gear having a drive projection, the eccentric having a first catch element, the eccentric having a flange surface, the wobble gear being supported in the axial direction on the flange surface of the eccentric;

the restraining mechanism has a trigger plate having a recess into which the drive projection extends and is freely movable between two ends of the recess, the trigger plate having a working face configured to support the driven member when the driven member is disengaged from the working face of the wobble gear; and is

The seatbelt retractor has a side cover which is fixed to the bracket, the ring gear being connected in a rotationally fixed manner to the side cover, the side cover having a bottom surface and a projection which projects from the bottom surface, the projection having a first shaft section which is spaced apart from the bottom surface and a second shaft section which adjoins the bottom surface, and a second latching element which is arranged at an end of the projection;

wherein the trigger plate is rotatably sleeved on the second shaft section, and the first snap element surrounds the first shaft section;

wherein the first and second snap elements form a snap connection such that the eccentric and the projection are fixed to each other in the axial direction, and the wobble gear presses the trigger plate against the bottom surface via the flange surface of the eccentric and the snap connection such that the trigger plate can be rotated relative to the bottom surface while overcoming the friction force.

In some embodiments, the maximum unwinding position can be a spindle position at which, in the installed state of the belt retractor in the motor vehicle, the length of webbing pulled out is greater than or equal to the length of webbing pulled out in the intended worn state of the seat belt device. This can be particularly advantageous in the case of a motor vehicle having a child seat, wherein an automatic locking of the webbing in the pull-out direction can be achieved when restraining a child sitting on the child seat.

In the seatbelt apparatus having such a seatbelt retractor, in an unused state in the motor vehicle, the vehicle feeling function of the vehicle feeling apparatus is suppressed by the suppressing mechanism, so that noise reduction can be achieved. When the seatbelt apparatus is worn, the vehicle-sensing apparatus can restore the vehicle-sensing function, and thus can desirably provide the vehicle-sensing function.

In some embodiments, the vehicle sensor device may comprise a base, a sensor element which is movable in the base and which can assume a stationary initial position in the base and can be moved in response to a vehicle operating state, and a stop element which is movably mounted in the base and which can assume a stationary initial position and can be raised by the sensor element, the stop element being configured to cause activation of the locking mechanism when raised from its stationary position into a predetermined position. In some embodiments, the stop element of the vehicle-sensing device can be configured as a pawl.

In some embodiments, the sensing element may be configured as a sensing steel ball and the base may have a pocket in which the sensing steel ball is rollable in response to vehicle operating conditions.

In some embodiments, the stop element of the sensor device can be designed as a claw element. In some embodiments, the jaw member is pivotally supported in the base. In some embodiments, the claw member may cover the pocket and a sensing steel ball received in the pocket. In further embodiments, the stop element of the sensor device can be designed as a linearly movable stop element.

In some embodiments, the locking mechanism may include a trigger locking mechanism that has a lower working load and therefore may be less strongly designed, and a primary locking mechanism that has a higher working load and therefore requires a stronger design.

In some embodiments, the locking mechanism may comprise a locking disc, the arresting of which can cause the locking of the spindle in the unwinding direction.

In some embodiments, the seat belt retractor may have a combination of the following features:

the locking mechanism includes a locking pawl, the locking disk having a locking groove, the locking groove having a radially inner end and a radially outer end, the locking pawl being guided by the locking groove and biased in a direction toward the radially inner end of the locking groove;

the bracket has a tooth portion;

the spindle has a hollow portion that receives the locking pawl;

wherein the locking pawl can engage with the toothing when moving in the direction of the radially outer end of the locking groove, so that the locking pawl is locked and thus the spindle is locked in the unwinding direction.

According to a second aspect of the present invention, a safety belt arrangement for a motor vehicle is proposed, the safety belt arrangement comprising a webbing and a safety belt retractor for a motor vehicle according to the first aspect of the present invention, wherein the spindle of the safety belt retractor is the spool of the webbing.

It is to be noted here that the above-mentioned technical features and the technical features to be mentioned below may be arbitrarily combined with each other as long as they are not mutually contradictory. All technically feasible combinations of features are the technical content explicitly included in the present application.

Drawings

The invention is explained in more detail below with the aid of a detailed description and with reference to the drawings. The schematic drawings are briefly described as follows:

fig. 1 is an exploded view of a seat belt retractor according to an embodiment of the present invention;

fig. 2 is a partially omitted view of a side cover of the seatbelt retractor of fig. 1 as viewed in an axial direction;

fig. 3 is a partially omitted longitudinal section through the components of the belt retractor according to fig. 1 in the assembled state; and is

Fig. 4 to 9 are schematic views of the restraint mechanism of the seatbelt retractor of fig. 1 viewed in the axial direction in different states.

Detailed Description

First, a seat belt retractor according to an embodiment of the present invention will be described with reference to fig. 1 to 3. In fig. 1, the webbing 12 is schematically shown in dashed lines, the spindle 1 being rotatably supported in the holder 4. An end cap 13 for receiving a coil spring which biases the spindle 1 in the retracting direction so that the webbing 12 is wound on the spindle 1 without an external pulling force, in which the webbing 12 is pulled out from the spindle 1 against the spring force of the coil spring, may be fixed on one end face of the holder 4.

The seatbelt retractor has a locking mechanism 100. The mandrel 1 has a recess 1.1, which receives the locking claw 3. The carrier 4 has a toothing 4.1. The locking pawl 3 can interact with the toothing 4.1. The recess 1.1, the toothing 4.1, the locking pawl 3 and the locking disk 2 to be described are part of the locking mechanism 100. The locking disk 2 has a locking groove 2.1, the locking groove 2.1 having a radially inner end and a radially outer end. The locking pawl 3 is inserted with a pin element 3.1 into the locking groove 2.1 and is thus guided by the locking groove 2.1. The locking pawl 3 is biased in the direction of the radially inner end of the locking groove by a spring element, not shown. The locking disc 2 is rotatably sleeved on the axon of the mandrel 1. In the case of an unlocked locking disk 2, the locking pawl 3 is in a radially inner position and is disengaged from the toothing 4.1, and the spindle 1 can be rotated together with the locking disk 2 via the locking pawl 3. If the spindle 1 is rotated in the unwinding direction with the locking disk 2 locked, the locking pawl 3 is forced to move in the direction of the radially outer end of the locking groove 2.1 until the locking pawl 3 engages with the toothing 4.1, whereupon the locking pawl 3 is locked together with the spindle 1. With the locking disk 2 locked and the locking pawl 3 engaged with the toothing 4.1, if the spindle 1 is rotated in the retraction direction, the locking pawl 3 is forced to move in the direction of the radially inner end of the locking groove 2.1, whereupon the locking pawl 3 is again disengaged from the toothing 4.1, so that the rotation of the spindle 1 in the retraction direction is not restricted. The locking disk 2 can have ratchet teeth 2.2 on the circumference, or the locking disk 2 can be designed as a ratchet. The stop element can engage with the ratchet 2.2 and thereby cause a stop of the locking disc 2.

The belt retractor has a vehicle-sensing device 6 which is designed to sense safety-relevant operating states of the motor vehicle, for example, acceleration, deceleration and inclination of the motor vehicle. For example, when the deceleration of the motor vehicle reaches or exceeds a threshold value, the vehicle-sensing device actuates the arresting element, so that the arresting element engages with the ratchet teeth 2.2 of the locking disk 2, and the locking function of the locking device is activated. In the embodiment shown in fig. 1, the vehicle sensor device 6 comprises a base 6.2, a sensor element 6.1 that can be moved in the base, and a stop element 6.3 that is movably supported in the base. The sensor element 6.1 can assume a stationary initial position in the base 6.2 and can be moved in response to the operating state of the motor vehicle. The stop element 6.3 can assume a rest initial position and can be lifted by the sensor element 6.1, the stop element 6.3 being designed to cause the activation of the locking mechanism 100 when lifted from its rest position into a predetermined position. The sensor element 6.1 can be designed as a sensor ball, and the base 6.2 can have a recess in which the sensor ball can roll in response to the operating state of the motor vehicle. The stop element 6.3 can be designed as a claw element which is pivotably mounted in the base 6.2 and which covers the recess and the sensor ball received therein. During the sensing of the rolling of the steel ball, the stop element 6.3 can be lifted in relation to the position of the rolling steel ball in the recess. When the stop element 6.3 is lifted to a predetermined position, the stop element 6.3 engages with the ratchet 2.2. The locking element 6.3 can be considered here as a component of the locking mechanism 100 or as a component of the vehicle sensor system 6.

In an alternative embodiment, two separate components can also be provided, one of which is a locking element belonging to the locking mechanism 100 and the other of which is a lifting element belonging to the vehicle-sensing device 6, which lifting element can actuate the locking element.

The belt retractor may comprise a side cover 5, which may be considered as a housing component of the belt retractor, part of the components of the belt retractor may be covered and protected by the side cover 5. The side cover 5 may be fixed to the bracket 4. In the embodiment shown in fig. 1, the vehicle-sensing device 6, the locking device 100 and the suppression mechanism 200 can be covered by the side cover 5, wherein the vehicle-sensing device 6 is mounted in a section 5.5 in the side cover 5.

The seatbelt retractor has a suppression mechanism 200 which can suppress the vehicle feel function of the vehicle feel device when required, achieve noise reduction, and can release the vehicle feel function of the vehicle feel device when required, achieve sensing of a safety-related operating state of the motor vehicle, and activate the locking function of the locking device when necessary.

The restraining mechanism 200 may include a speed reduction mechanism having an input member 7 and an output member 8. The reduction mechanism can be designed as a wobble mechanism, wherein the input element 7 can be designed as an eccentric and is connected in a rotationally fixed manner to the spindle 1, the output element 8 can be designed as a wobble gear and has an integrated fan-shaped flange 8.1, the outer circumferential surface of which forms a running surface, and a stationary ring gear 5.1 can be provided in the side cover 5. The wobble gear is supported eccentrically by the eccentric relative to the rotational axis of the spindle 1 and meshes with the toothed ring 5.1.

In the embodiment shown in fig. 1, the locking mechanism 200 has a trigger disk 9 with a recess 9.1, which is rotatably mounted. The output element 8 has a drive projection 8.2 which projects into the recess 9.1 and is freely movable between two ends 9.3, 9.4 of the recess 9.1. The trigger plate 9 has a working surface. The working surface of the trigger plate 9 has a recess 9.2.

The damping mechanism 200 comprises a follower 10, a damping part 11.1 coupled in motion to the follower 10, and a return spring 11, the return spring 11 biasing the follower 10 in a direction to move the damping part 11.1 away from the stop element 6.3. The driven member 10 may be designed as a pivotably mounted driven member. The suppression means may be configured as a cantilever portion of the return spring 11. The cantilevered portion may move with the follower 10. The follower 10 has a support arm 10.1 and a stop element 10.2, which can be designed as a pawl. When the driven member 10 rests with the support arm 10.1 on the working surface of the output element 8, the suppressing part 11.1 presses against the stop element 6.3 of the vehicle-sensing device 6, so that the stop element 6.3 and the sensing element 6.1 cannot move relative to the base 6.2, and thus noise of the vehicle-sensing device caused by part collision can be reduced or even eliminated. When the supporting arm 10.1 is disengaged from the working surface of the output element 8, the blocking element 11.1 is moved away from the locking element 6.3 by the return spring 11 under the influence of the output element 10 and thus releases the feel function of the feel device. The supporting arms 10.1 of the driven element 10 can rest on the working surface of the output element 8 and on the working surface of the trigger plate 9, which can be offset in time from one another, or can be arranged one behind the other and continuously or partially overlapping.

In fig. 2 and 3, the section 5.5 of the side cover 5 is omitted. As can be seen from fig. 2 and 3, the side cover 5 has a bottom surface 5.4 and a projection extending from the bottom surface. The input element 7 has a flange surface 7.2, and the output element 8 is supported in the axial direction on the flange surface 7.2 of the input element 7. The input element 7 has a first catch element 7.1 and is rotatably mounted on the projection. The projection has a first shaft section 5.2 spaced apart from the bottom surface 5.4 and a second shaft section 5.3 adjoining the bottom surface 5.4 and a second snap element 5.2.1 arranged on the end of the projection. Due to the reduced diameter of the first shaft section relative to the second shaft section, a flange surface 5.2.2 is formed on the projection. The first catch element 7.1 and the second catch element 5.2.1 form a catch connection such that the input element 7 and the projection are fixed to each other in the axial direction. The first snap element 7.1 surrounds the first shaft section 5.2. By means of the flange surface 7.2 of the input element 7 and the snap-fit connection, the output element 8 presses the trigger disk 9 against the bottom surface 5.4, so that the trigger disk 9 can be rotated relative to the bottom surface 5.4 against frictional forces.

The operation of the restraining mechanism 200 for a seatbelt retractor according to the present invention will be described with reference to fig. 4 to 9.

In the operating state shown in fig. 4, the mandrel 1 is in a predetermined rest position. In the mounted state of a seat belt arrangement with a seat belt retractor and a webbing 12 in a motor vehicle, when the seat belt arrangement is not being worn, the webbing 12 is maximally retracted on a spindle 1 under the action of the spring force of a coil spring of the seat belt retractor, said spindle 1 being in a predetermined rest position. In the state shown in fig. 1, the supporting arms 10.1 of the driven element 10 rest against the running surface of the flange 8.1 of the output element 8 and close to the front end 8.1.1 thereof in the unwinding direction, the drive projection 8.2 rests against the end 9.3 of the recess 9.1, and the holding part 11.1 presses against the stop element 6.3 of the vehicle-sensing device 6, so that the vehicle-sensing device 6 is held back and noise reduction is possible.

From the state shown in fig. 4, the spindle 1 rotates in the unwinding direction, and the output member 8 rotates in the first direction D1 corresponding to the unwinding direction at a predetermined reduction ratio, to reach the state shown in fig. 5. Accordingly, the webbing 12 is pulled out by a certain length. The bearing surface of the flange 8.1 of the output element 8 continues to bear against the bearing arm 10.1 of the driven element 10, the holding-down element 11.1 continues to bear against the stop element 6.3 of the vehicle-sensing device 6, and the bearing arm 10.1 of the driven element 10 approaches the rear end 8.1.2 of the bearing surface of the flange 8.1 of the output element 8 in the unwinding direction or first direction.

Starting from the state shown in fig. 5, the spindle 1 continues to rotate in the unwinding direction, the output element 8 rotates with a predetermined reduction ratio in the first direction D1, and the state shown in fig. 6 is reached, in which the running surface of the flange 8.1 of the output element 8 has just left the support arm 10.1 with its end 8.1.2, and the support arm 10.1 rests on the running surface of the trigger plate 9 under the action of the return spring 11. The suppression part 11.1 is moved away from the stop element 6.3 of the vehicle-sensing device 6 by the driven part 10, so that the vehicle-sensing function of the vehicle-sensing device 6 is restored.

The mandrel 1 has undergone a first stroke in the unwinding direction from the state shown in fig. 4 to the state shown in fig. 6, the webbing 12 being pulled out by a first length corresponding to the first stroke of the mandrel 1. The trigger plate 9 remains stationary under the effect of static friction and the drive lugs 8.2 move freely in the recesses 9.1.

Starting from the state shown in fig. 6, the spindle 1 continues to rotate in the unwinding direction, the output element 8 rotates in the first direction D1 at a predetermined reduction ratio, and the state shown in fig. 7 is reached, in which the support arm 10.1 continues to rest on the running surface of the trigger plate 9, the feel device 6 continues to be effective, and the transmission projection 8.2 comes to rest on the end 9.4 of the recess 9.1.

Starting from the state shown in fig. 7, the spindle 1 continues to rotate in the unwinding direction, the trigger plate 9 is moved by the drive cam 8.2 in the first direction D1, until the state shown in fig. 8 is reached, in which the support arm 10.1 enters the recess 9.2 of the running surface of the trigger plate 9 under the action of the return spring 11, at which point the stop element 10.2 engages with the ratchet teeth 2.2 of the locking plate 2, thus activating the locking device 100, so that the spindle 1 cannot continue to rotate in the unwinding direction, the spindle 1 reaches the maximum unwinding position, and the webbing 12 reaches the maximum pull-out length. The position of the spindle 1 can correspond to a state between the state shown in fig. 4 and the state shown in fig. 8, in particular in the case of a child seat, when the seatbelt device is worn by the occupant as intended in a motor vehicle.

Starting from the state shown in fig. 8, when the seat belt device is removed from being worn, the spindle 1 is continuously rotated in the retraction direction by the restoring force of the coil spring, the output element 8 is rotated in a second direction D2 opposite to the first direction D1 at a predetermined reduction ratio, the transmission projection 8.2 is separated from the end 9.4 of the recess 9.1 and is freely moved in the recess 9.1 until it abuts against the end 9.3 of the recess 9.1, and the locking disk 9 remains stationary. The drive cam 8.2 then entrains the locking disk 9 in the second direction D2, so that the supporting arm 10.1 is disengaged from the recess 9.2. When the spindle 1 is rotated in the retraction direction into the position shown in fig. 9, the support arm 10.1 is disengaged from the running surface of the locking disk 9, and the support arm 10.1 reaches the end 8.1.2 of the running surface of the output element 8. The face surface of the flange 8.2 of the output element 8 again supports the supporting arm 10.1 of the follower 10, so that the inhibiting part 11.1 again presses the stop element 6.3 of the ride-on device 6. Under the restoring force of the coil spring, the spindle 1 can be returned in the take-up direction from the state shown in fig. 9 to the predetermined rest position shown in fig. 4.

Finally, it is pointed out that the specific embodiments are only used for understanding the invention and do not limit the scope of protection of the invention. It will be apparent to those skilled in the art that modifications may be made in the embodiments without departing from the scope of the invention.

Claims (28)

1. A seatbelt retractor for a motor vehicle, comprising:

a support (4);

a spindle (1) which is rotatably mounted in a holder (4) and is biased in the retraction direction;

a locking mechanism (100) configured for, in an activated state, locking the spindle (1) in an unwinding direction and, in a deactivated state, releasing the spindle (1);

a vehicle sensing device (6) configured for sensing a safety-related operating state of a motor vehicle, the vehicle sensing device having a movable part; and

a damping mechanism (200) comprising a reduction mechanism having an input element (7) and an output element (8), the input element being connected in a rotationally fixed manner to the mandrel (1);

it is characterized in that the preparation method is characterized in that,

the output element (8) has a working face;

the dampening mechanism (200) comprising a follower (10), a dampening member (11.1) kinematically coupled with the follower (10), the follower (10) being manoeuvrable by a working surface of the output element (8), and a return spring (11), the return spring (11) biasing the follower (10) in a direction causing the dampening member (11.1) to release the movable part;

wherein, in a predetermined rest position of the mandrel (1), a working surface of the output element (8) manipulates the follower (10) such that the restraining part (11.1) is in a position to restrain the movable part;

wherein, in the unwinding direction, after a predetermined rotational stroke of the spindle (1) from the rest position, the restraining member (11.1) leaves a position that restrains the movable member.

2. The seatbelt retractor for a motor vehicle according to claim 1, characterized in that the output element (8) has an integrated flange (8.1), the outer circumferential surface of which constitutes the running surface.

3. The seatbelt retractor for a motor vehicle according to claim 1 or 2, wherein the follower (10) is disengaged from the working surface of the output member (8) after a predetermined rotational stroke of the spindle (1) in an unwinding direction.

4. The belt retractor for a motor vehicle according to claim 1 or 2, wherein the reduction mechanism is designed as a wobble mechanism comprising an eccentric as an input element (7) which is connected in a rotationally fixed manner to the spindle (1), a wobble gear as an output element (8) which is mounted eccentrically with respect to the axis of rotation of the spindle (1) by means of the eccentric, and a stationary toothed ring (5.1) which meshes with the toothed ring (5.1).

5. The seatbelt retractor for a motor vehicle according to claim 1 or 2,

the suppression mechanism (200) has a trigger disk (9) which has a recess (9.1), is rotatably mounted and can be rotated against a resistance force;

the output element (8) has a drive projection (8.2) which projects into the recess (9.1) and is freely movable between two ends (9.3, 9.4) of the recess (9.1); and is

The trigger plate (9) has a working face configured for supporting the driven member (10) when the driven member (10) is disengaged from the working face of the output element (8).

6. The seatbelt retractor for a motor vehicle according to claim 5, characterized in that the follower (10) has a stop element (10.2), the running surface of the trigger disk (9) has a recess (9.2), the running surface of the trigger disk (9) and the stop element (10.2) are configured:

-the follower (10) is supported on the working face of the trigger plate (9) outside the recess (9.2) after a predetermined rotational stroke of the spindle (1) in the unwinding direction and before a predetermined maximum unwinding position of the spindle (1),

the stop element (10.2) is inoperative; and is

-in the maximum unwinding position of the mandrel (1), the follower (10) is supported in the recess (9.2), the stop element (10.2) causing the activation of the locking mechanism (100).

7. The seatbelt retractor for a motor vehicle according to claim 6, characterized in that the stop element (10.2) is designed as a pawl.

8. The seatbelt retractor for a motor vehicle according to claim 1 or 2, wherein the follower (10) is configured as a pivotably supported follower.

9. The seatbelt retractor for a motor vehicle according to claim 1 or 2, characterized in that the follower (10) has a support arm (10.1) which is configured for resting on a running surface of the output element (8).

10. The seatbelt retractor for a motor vehicle according to claim 5, characterized in that the follower (10) has a bearing arm (10.1) which is configured for resting on a running surface of the output element (8) and for resting on a running surface of the triggering plate (9).

11. The seatbelt retractor for a motor vehicle according to claim 9, characterized in that in the predetermined rest position of the spindle the supporting arm (10.1) rests on the running surface of the output element (8) in a region adjacent to the end (8.1.1) of the running surface of the output element (8) which is forward in the unwinding direction.

12. The seatbelt retractor for a motor vehicle according to claim 1 or 2, characterized in that the restraining part is an integral elastic component of the follower (10) or is constructed as a cantilevered part of the return spring (11).

13. The seatbelt retractor for a motor vehicle according to claim 1 or 2, characterized in that the seatbelt retractor has a side cover (5) which is fixed on the bracket (4).

14. The seatbelt retractor for a motor vehicle according to claim 13, characterized in that the side cover (5) has a bottom surface (5.4) and a projection projecting from the bottom surface, on which projection the input element (7) is rotatably supported.

15. The seatbelt retractor for a motor vehicle according to claim 14, characterized in that the input element (7) has a first catch element (7.1) and the projection has a second catch element (5.2.1), the first catch element and the second catch element forming a catch connection such that the input element (7) and the projection are fixed to each other in the axial direction.

16. The seatbelt retractor for a motor vehicle according to claim 1 or 2, characterized in that the input element (7) has a flange surface (7.2), the output element (8) being supported in the axial direction on the flange surface (7.2) of the input element (7).

17. The belt retractor for a motor vehicle as claimed in claim 5, characterized in that the belt retractor has a side cover (5) which is fixed to the bracket (4), the side cover (5) having a base surface (5.4) and a projection which projects from the base surface and on which the triggering plate (9) is rotatably supported.

18. The seatbelt retractor for a motor vehicle according to claim 17, characterized in that the trigger plate (9) is pressed against the bottom surface (5.4) such that the trigger plate (9) can be rotated relative to the bottom surface (5.4) against the friction force.

19. The seatbelt retractor for a motor vehicle according to claim 18,

the input element (7) has a first snap element (7.1) and the projection has a second snap element (5.2.1), which form a snap connection, so that the input element (7) and the projection are fixed to each other in the axial direction;

the input element (7) has a flange surface (7.2), and the output element (8) is supported on the flange surface (7.2) of the input element (7) in the axial direction;

the output element (8) presses the trigger plate (9) against the base surface (5.4) via the flange surface (7.2) of the input element (7) and the snap connection.

20. The seatbelt retractor for a motor vehicle according to claim 19, characterized in that the projection has a first shaft section (5.2) spaced apart from the bottom surface and a second shaft section (5.3) adjoining the bottom surface, the triggering plate (9) being rotatably mounted on the second shaft section (5.3), the first catch element (7.1) surrounding the first shaft section (5.2), the second catch element (5.2.1) being arranged on the end of the projection.

21. The belt retractor for a motor vehicle as claimed in claim 4, characterized in that the belt retractor has a side cover (5) which is fixed to the bracket (4), the toothed ring (5.1) being connected in a rotationally fixed manner to the side cover (5).

22. The seatbelt retractor for a motor vehicle according to claim 1,

the reduction mechanism is designed as a wobble gear mechanism comprising an eccentric as an input element (7) which is connected in a rotationally fixed manner to the spindle (1), a wobble gear as an output element (8) and a ring gear (5.1), the wobble gear being mounted eccentrically by the eccentric with respect to the axis of rotation of the spindle (1) and meshing with the ring gear (5.1), the wobble gear having an integrated, sector-shaped flange (8.1), the outer circumferential surface of which forms the running surface, the wobble gear having a drive projection (8.2), the eccentric having a first snap element (7.1), the eccentric having a flange surface (7.2), the wobble gear being supported in the axial direction on the flange surface of the eccentric;

the dampening mechanism (200) has a trigger disk (9) with a recess (9.1), the transmission projection projecting into the recess (9.1) and being freely movable between two ends (9.3, 9.4) of the recess, the trigger disk (9) having a working face configured for supporting the driven member (10) when the driven member (10) is disengaged from the working face of the oscillating gear; and is

The safety belt retractor comprises a side cover (5) which is fixed on the bracket (4), the gear ring (5.1) is connected with the side cover (5) in a rotation-proof manner, the side cover (5) comprises a bottom surface (5.4) and a projection extending from the bottom surface, the projection comprises a first shaft section (5.2) separated from the bottom surface and a second shaft section (5.3) adjacent to the bottom surface, and a second snap element (5.2.1) arranged on the end of the projection;

wherein the trigger plate (9) is rotatably mounted on the second shaft section (5.3) and the first snap element (7.1) surrounds the first shaft section (5.2);

wherein the first snap element (7.1) and the second snap element (5.2.1) form a snap connection such that the eccentric and the projection are fixed to each other in the axial direction, the wobble gear pressing the trigger disk (9) against the bottom surface (5.4) by means of the flange surface (7.2) of the eccentric and the snap connection such that the trigger disk can be rotated relative to the bottom surface (5.4) against friction.

23. The seatbelt retractor for a motor vehicle according to claim 1 or 2, characterized in that the vehicle-sensing device (6) comprises a base (6.2), a sensor element (6.1) movable in the base, and a stop element (6.3) movably supported in the base, the sensor element (6.1) being able to assume a stationary initial position in the base (6.2) and being movable in response to a motor vehicle operating state, the stop element (6.3) being able to assume a stationary initial position and being able to be lifted by the sensor element (6.1), the stop element (6.3) being configured to cause activation of the locking mechanism (100) upon lifting from its stationary position to a predetermined position.

24. The belt retractor for a motor vehicle as claimed in claim 23, characterized in that the sensor element (6.1) is configured as a sensor steel ball, the base (6.2) having a recess in which the sensor steel ball can roll in response to the operating state of the motor vehicle.

25. The belt retractor for a motor vehicle as claimed in claim 24, characterized in that the stop element (6.3) is designed as a claw element which is pivotably mounted in the base (6.2) and which covers the recess and the sensor steel ball received therein.

26. The seatbelt retractor for a motor vehicle according to claim 1 or 2, characterized in that the locking mechanism (100) comprises a locking disc (2), the locking of which can lead to the locking of the spindle (1) in the unwinding direction.

27. The seatbelt retractor for a motor vehicle according to claim 26,

the locking mechanism (100) comprises a locking pawl (3), the locking disc (2) has a locking groove (2.1), the locking groove (2.1) has a radial inner end and a radial outer end, the locking pawl (3) is guided by the locking groove (2.1) and is biased in the direction of the radial inner end of the locking groove;

the carrier (4) has a toothing (4.1);

the mandrel (1) has a recess (1.1) which receives the locking pawl (3);

wherein the locking pawl (3) can engage with the toothing (4.1) when moving in the direction of the radially outer end of the locking groove, such that the locking pawl (3) is locked and thus the spindle (1) is locked in the unwinding direction.

28. A safety belt arrangement for a motor vehicle, the safety belt arrangement comprising a webbing, characterized in that the safety belt arrangement comprises a belt retractor for a motor vehicle according to any one of claims 1 to 27, wherein the spindle (1) of the belt retractor is a spool of the webbing.

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