WO2020078171A1

WO2020078171A1 - Locking device for seat belt retractor, and seat belt retractor

Info

Publication number: WO2020078171A1
Application number: PCT/CN2019/107385
Authority: WO
Inventors: 王飞; 张立俊
Original assignee: 延锋汽车智能安全系统有限责任公司
Priority date: 2018-10-19
Filing date: 2019-09-24
Publication date: 2020-04-23
Also published as: CN109159755A

Abstract

A locking device for a seat belt retractor, and a seat belt retractor. The locking device comprises an inertial element (3) and a control disc (4); the inertial element (3) is pivotably supported between an initial position and a locked position around a pivoting axis; the inertial element (3) is disposed on the control disc (4) and has a body; the control disc (4) can be driven to rotate by a reel component (5); the inertia element (3) is pre-tensioned toward the initial position by a spring element (2), and inertia force of the inertia element (3) toward the locked position can be generated when the reel component (5) is accelerated in a webbing pull-out direction; the inertia element (3) can be stopped at the locked position, thereby locking the seat belt retractor; the inertia element (3) has protrusions (3.3, 3.4, 3.5) protruding from the body of the inertia element (3) toward the control disc (4); the control disc (4) is provided with through holes; the protrusions (3.3, 3.4, 3.5) pass through the through holes; the protrusions (3.3, 3.4, 3.5) form an additional inertial mass. In this way, the sensitivity in belt sensing can be improved and noise can be reduced.

Description

Locking device for seat belt retractor and seat belt retractor

Technical field

The present invention relates to a locking device for a seat belt retractor and a seat belt retractor including such a locking device.

Background technique

Vehicle seat belts are an important part of the vehicle occupant restraint system. Especially in traffic accidents, they can provide protection for vehicle occupants to prevent occupants from being injured or reduce injuries to a minimum. As vehicle ownership continues to increase, vehicle users are increasingly demanding safety performance of vehicle seat belts.

The webbing can be retracted by the seat belt retractor and can be pulled out from the seat belt retractor. When needed, for example, when the vehicle is decelerating violently, especially when the vehicle is braking suddenly or in a collision, the webbing needs to be prevented from being pulled out in order to effectively restrain the occupant through the webbing, so that the occupant is better protected. For this reason, the seat belt retractor should have an emergency locking function, so that the reel assembly is urgently locked, so that the webbing cannot continue to be pulled out of the reel assembly. This can be achieved by sensing the acceleration of the pull-out of the webbing, and the locking device related to this can also be referred to as a belt-sensing locking device.

With more and more vehicle development styles and higher and higher integration of the whole vehicle, the requirements for the size reduction of the seat belt retractor are becoming higher and higher, and the system integration and size reduction of the inductive locking device in its system The requirements are getting higher and higher.

In addition, the requirements of vehicle users for vehicle comfort are also increasing, especially in terms of vehicle noise, vehicle users expect the highest possible quietness in the vehicle when the vehicle is running. The seat belt retractor includes many metal parts, which may collide with each other when the vehicle is traveling due to factors such as vehicle vibration, thereby causing a certain amount of noise. In order to improve the comfort of the vehicle seat belt when using it, on the premise of ensuring the reliability of the product, it is expected to reduce the noise of the seat belt retractor as much as possible.

From the patent document EP2621767B1, a locking device for a seat belt retractor is known, which comprises an inertial element, a spring element for pretensioning the inertial element towards an initial position, and a control disk configured as a ratchet, the ratchet having A snap element protruding from its bottom surface, the inertial element has two ramp-shaped abutment slopes arranged on both sides on its radially outer edge, and the snap element cooperates with the abutment slope for Reduce the noise of the inertial element when the vehicle is driving. Such a locking device has a complicated structure, requires high machining accuracy of parts, and requires a larger axial size, which reduces the peripheral mass of the inertial element and thus reduces the rotational inertia of the inertial element about its pivot axis, thus improving the spring The sensitivity requirements of the components and the difficulty of selecting materials for inertial components are increased. Increasing the thickness or width of the inertial element can increase the inertial mass and the moment of inertia of the inertial element, thus increasing the sensitivity of the locking device, but it also increases the overall size of the locking device and thus the entire belt retractor This contradicts the compactness and miniaturization of the seat belt retractor.

Related prior art can also be seen in patent document CN104755331A, which also discloses a locking device for a seat belt retractor and a seat belt retractor including such a locking device.

Summary of the invention

An object of the present invention is to provide a locking device for a seat belt retractor and a seat belt retractor including such a lock device, whereby the overall size of the seat belt retractor can be substantially maintained Improve the sense of sensitivity of the locking device under the same condition.

The object is achieved by a locking device for a seat belt retractor, the locking device comprising an inertial element and a control disk, the inertial element being pivotally pivotable between an initial position and a locked position about a pivot axis Support, the inertial element is provided on the control disc and has a body, the control disc can be driven to rotate by the reel assembly of the seat belt retractor, the inertial element is pretensioned toward the initial position by the spring element, and is wound The belt barrel assembly can generate an inertial force of the inertial element toward the locked position when accelerating in the direction of pulling out the webbing, the inertial element can be stopped in the locked position, and thus cause the locking of the seat belt retractor, The inertial element has a protrusion that protrudes from its body toward the control disk, and the control disk has a through hole through which the protrusion constitutes an additional inertial mass.

The beneficial effect of the locking device according to the present invention is that, under the condition that the overall size of the seat belt retractor remains substantially unchanged, the belt sensitivity can be improved, and the sensitivity design requirements of the spring element can be reduced.

According to an advantageous embodiment of the invention, the inertial element has a flat body.

According to an advantageous embodiment of the present invention, the number of the protrusions is 1, 2, 3 or more.

According to an advantageous embodiment of the invention, each projection is provided with a through hole.

According to an advantageous embodiment of the invention, the projections and the corresponding through-holes are dimensioned such that the projections have the same range of movement in the corresponding through-holes. Therefore, the size of each through hole can be minimized, and the weakening of the strength of the control panel by the through hole can be reduced as much as possible.

According to an advantageous embodiment of the invention, the protrusion is designed as a boss.

According to an advantageous embodiment of the invention, the projection is arranged on the radially outer edge of the body of the inertial element. Therefore, when the same inertial mass is added, the moment of inertia can be increased as much as possible.

According to an advantageous embodiment of the present invention, the protrusion abuts the first region of the edge of the hole of the through hole in the initial position. Therefore, it is possible to dispense with a separately provided stop, which is required as in the prior art EP2621767B1. This can further reduce the axial dimension of the locking device.

According to an advantageous embodiment of the present invention, the protrusion and / or the first region has a first slope, so that the inertial element is in the initial position under the action of the spring force of the spring element in the circumferential direction, The first region is supported axially and radially.

According to an advantageous embodiment of the present invention, the protrusion has an L-shaped latching surface, so that the inertial element is in the initial position in the circumferential, axial and radial directions under the action of the spring force of the spring element Supported by the first area.

According to an advantageous embodiment of the invention, the projection abuts against the second region of the hole edge of the through hole in the blocking position of the inertial element.

According to an advantageous embodiment of the present invention, the protrusion and / or the second region has a second slope, so that the inertial element is in the locking position in the circumferential direction and axial direction under the action of the inertial force And supported by the second region in the radial direction.

According to an advantageous embodiment of the present invention, the protrusion has a second L-shaped snap surface, and the second L-shaped snap surface has the second inclined surface.

According to an advantageous embodiment of the invention, the inertial element has a rounded contour on the radially outer edge.

According to an advantageous embodiment of the invention, the inertial element is made of metal.

According to an advantageous embodiment of the invention, the inertial element has teeth, which are used to cooperate with corresponding teeth, which are formed on the bracket of the seat belt retractor or on On the component fixedly connected to the bracket, in the initial position of the inertial element, the tooth portion is disengaged from the corresponding tooth portion, and in the locked position of the inertial element, the tooth portion is engaged with the corresponding tooth portion.

According to an advantageous embodiment of the present invention, the component fixedly connected to the bracket is a mechanical side cover fixed on the bracket.

According to an advantageous embodiment of the present invention, the inertial element has a pivot hole, the control disk has a pivot shaft, and the inertial element is pivotably mounted on the pivot shaft through the pivot hole.

According to an advantageous embodiment of the invention, the control disk is designed as a pot-shaped body, which includes a bottom and a surrounding circumferential wall.

According to an advantageous embodiment of the present invention, the circumferential wall of the pot-shaped body is on one side of the bottom, or protrudes on both sides relative to the bottom.

According to an advantageous embodiment of the present invention, the circumferential wall is provided with ratchet teeth distributed on the outer circumferential surface, and the ratchet teeth are configured to cooperate with the ratchet pawl of the vehicle sensing device so that the ratchet pawl and ratchet The control panel is locked when the teeth are engaged. Therefore, the integration of the vehicle-feeling lock function and the sensor-feeling lock function is realized.

According to an advantageous embodiment of the invention, the control disk can be rotatably mounted on one axial end of the reel assembly by a snap connection.

According to an advantageous embodiment of the invention, the control panel is integrally formed by injection molding.

According to an advantageous embodiment of the present invention, the locking device further includes a locking claw and another spring element, the control disk has a waist-shaped groove; the locking claw is accommodated at one end of the reel assembly In the vacant portion of the partial area, the locking claw has a pin shaft, the pin shaft is accommodated in a waist-shaped groove, the pin shaft is a transmission element between the reel assembly and the control disk; the locking claw It has a tooth part for cooperating with a corresponding tooth part, which is formed on the bracket or on a component fixedly connected to the bracket; the additional spring element faces the waist groove The direction of the radially inner end biases the locking claw so that the teeth of the locking claw are disengaged from the corresponding teeth; and when the control disk is locked and the reel assembly rotates in the unwinding direction, the locking The claws are forcibly guided so that the teeth of the locking claws mesh with the corresponding teeth, and thus the reel assembly is locked. Therefore, the locking function is divided into trigger locking and main locking, and the components related to the trigger locking function only need to be designed for small loads, so they have high flexibility in terms of materials and dimensions.

According to an advantageous embodiment of the invention, the spring element is designed as a helical compression spring which is supported at one end on the control disk and at the other end on the inertial element.

According to an advantageous embodiment of the invention, the inertial element can be arranged on the side of the bottom of the control disk, preferably the pivot axis of the inertial element extends parallel to the axis of rotation of the control disk at a distance. Alternatively, the pivot axis of the inertial element and the axis of rotation of the control disk may also extend at an angle to each other.

The object is also achieved by a seat belt retractor, which includes a bracket and a reel drum assembly rotatably supported in the bracket, the seat belt retractor further includes a seat belt retractor according to the present invention Locking device.

The seat belt retractor has beneficial technical effects achieved by the locking device.

It should be pointed out here that the technical features described in the application documents can be arbitrarily combined, as long as this combination is technically feasible or not contradictory, all these combinations are the technical content described in this application.

BRIEF DESCRIPTION

The present invention is explained in more detail below with reference to the embodiments in conjunction with the drawings. The schematic drawings are as follows:

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

2 is a view from the first side of the locking device in the initial position according to an embodiment of the present invention;

3 is a view from the second side opposite to the first side of the locking device shown in FIG. 2;

4 is a view from the first side of the locking device in the locked position;

5 is a view from the second side opposite to the first side of the locking device shown in FIG. 4;

6 is a view of the control panel from the first side;

7 is a perspective view of the control panel;

8 is a perspective view of the inertial element; and

9 is a view from the second side of the inertial element.

detailed description

FIG. 1 is a perspective view of a seat belt retractor according to an embodiment of the present invention. The seat belt retractor includes a bracket not described in FIG. 1, particularly a U-shaped bracket in which the tape reel assembly 5 is rotatably supported, the webbing can be wound on the tape reel assembly 5 and can Unwind and pull out from the reel assembly 5. A recess is provided on one axial end of the reel assembly 5, and the locking claw 5.1 is accommodated in the recess, the locking claw has a tooth portion and a pin.

The control panel 4 is rotatably sleeved on the shaft head 5.2 of the reel assembly 5 with its central hole 4.9 through a snap connection. The control disk 4 has a waist-shaped groove 4.8 into which the pin of the locking claw 5.1 is inserted, and is biased in the direction radially inward of the waist-shaped groove by a spring element not shown in FIG. 1. The locking claw 5.1 and its pin shaft are transmitted between the reel assembly 5 and the control disk 4 so that the control disk 4 can be driven to rotate by the reel assembly 5. When the control disk 4 is locked, the continuous rotation of the reel assembly 5 in the direction of the webbing withdrawal will force the locking claw 5.1 to move radially outward under the guidance of the waist groove 4.8 until the teeth of the locking claw 5.1 correspond to The teeth are engaged to lock the reel assembly 5, and the corresponding teeth are provided on the bracket or on a component fixed to the bracket such as the mechanical side cover 1 shown in FIG.

As shown in FIG. 1, the control panel 4 may be configured as a pot-shaped body having a bottom and a surrounding circumferential wall. The circumferential wall may be on one side of the bottom or may protrude from the bottom on both sides. It is particularly advantageous that the circumferential wall has distributed ratchet teeth on its outer circumferential surface, and these ratchet teeth can cooperate with the ratchet pawls of the vehicle sensing device (not shown). The vehicle-sensing device can, for example, sense the inclination angle of the vehicle, and when the inclination angle exceeds a predetermined threshold value, engage the pawl with the ratchet teeth to lock the control disk 4 and thus trigger the locking of the reel assembly 5. A suppressing device for suppressing the vehicle feel function of the vehicle feel device may be provided on the peripheral wall section adjacent to the peripheral wall section where the ratchet teeth are located. Regarding the vehicle feeling device and its suppression device, devices known in the prior art may be used, and the vehicle feeling device and its suppression device developed by the applicant are particularly preferred here. The entire contents of the applicant's prior Chinese patent applications 201811070903.1 and 201811070904.6 are incorporated herein by reference as part of this application.

The inertial element 3 is pivotally supported on the control panel 4 about the pivot axis between the initial position and the locked position, where the inertial element 3 has a pivot hole and the control panel 4 has a pivot axis. The pivot axis formed by the pivot shaft and the pivot hole is parallel to the rotation axis of the control disk 4 or the hole axis of the central hole 4.9 of the control disk 4, and the pivot axis is spaced from the rotation axis of the control disk 4. The inertial element 3 has a flat body and a plurality of protrusions extending from the body.

In FIG. 1 can also be seen a spring element 2 configured as a coil spring, which is supported at one end on the control disk 4 and at the other end on the inertial element 3. As an alternative, the spring element 2 can also be configured as a leaf spring, a wire spring, a helical torsion spring or other types of spring elements. The spring element 2 pretensions the inertial element towards the initial position.

The mechanical side cover 1 can also be seen in FIG. 1, which can be fixed on the bracket of the seat belt retractor, for example, by screws, for accommodating and covering the components of the locking device. At the other axial end of the reel assembly, a coil spring side cover not shown in FIG. 1 may be provided, which is also fixed on the bracket for accommodating and covering the reel assembly 5 A coil spring preloaded in the direction of winding.

2 is a view of the locking device according to an embodiment of the present invention viewed from the first side in an initial position, and FIG. 3 is a view from the first side of the locking device shown in FIG. 2 opposite to the first side View from both sides. The locking device can be used in the seat belt retractor shown in FIG. 1. Here only the main components of the locking device, the control disk 4, the inertial element 3 and the spring element 2 are shown.

The inertial element 3 has a pivot hole 3.1, and the control panel 4 has a pivot shaft 4.1. The inertial element 3 is pivotally mounted on the pivot shaft 4.1 with its pivot hole 3.1 by a snap connection, and the central axis of the pivot shaft 4.1 and the control The center axis of the center hole 4.9 of the disc 4 is separated by a distance. The inertial element 3 has a flat body so that the axial dimension of the body is minimized while the inertial mass and rotational inertia are maximized. The inertial element 3 has an outer edge that extends in a circular arc shape, and the direction of the outer edge at the initial position of the inertial element 3 may be substantially parallel to the direction of the inner circumferential surface of the circumferential wall of the control disk 4. The inertial element 3 can have a stop element on its outer edge, in particular on the end of the outer edge, which can be, for example, a tooth 3.7.

The spring element 2 is accommodated and supported on the spring seat of the control panel 4 with one end thereof, and is supported on one support surface of the inertial element 3 with the other end thereof, so that the inertial element 3 is pressed by the spring element 2 with a predetermined preload In the initial position. In FIG. 2, the spring element 2 is configured as a compression spring. As an alternative, tension springs are also possible. On the bracket of the seat belt retractor, or on the component fixed to the bracket, such as the mechanical side cover 1, corresponding teeth or corresponding stop elements that cooperate with the teeth 3.7 may be provided. In the initial position, the tooth 3.7 and the corresponding tooth, or the stop element and the corresponding stop element, are disengaged from each other.

In FIG. 3, three through holes of the control panel 4 and three protrusions 3.3, 3.4, and 3.5 of the inertial element 3 can be seen. These protrusions are respectively formed as bosses extending from the body of the inertial element and passing through the through holes , Each protrusion is equipped with a corresponding through hole. The protrusion 3.3 has a first inclined surface 3.2. Alternatively or additionally, the protrusion 3.4 may have a first inclined surface and / or the protrusion 3.5 may have a first inclined surface 3.6. In the initial position of the inertial element 3, the first inclined surface 3.2 abuts against the first area 4.2 of the hole edge of the through hole matching the protrusion 3.3 under the preload of the spring element 2, as an alternative or supplement, The first inclined surface of the protrusion 3.4 abuts on the first region 4.4 of the hole edge of the through hole matching the protrusion 3.4 under the action of the preload of the spring element 2. As an alternative or supplement, the first of the protrusion 3.5 The inclined surface 3.6 abuts on the first region 4.6 of the edge of the hole of the through-hole that matches the projection 3.5 under the pretension of the spring element 2.

It goes without saying that only one of the three projections is provided with a first inclined surface to already achieve stable support of the inertial element 3 in various directions relative to the control panel 4 at the initial position, and thus reduce or even eliminate driving in the vehicle Noise caused by inertial element 3 in the middle. In the case where the three protrusions are provided with the first inclined surface, it is not necessary that all three first inclined surfaces are in close contact with the first area of the hole edge of the corresponding through hole, for example, the protrusion 3.4 may not be provided with the first inclined surface Alternatively, a first inclined surface may be provided, and the corresponding end of the protrusion 3.4 or the first area of the first inclined surface of the protrusion 3.4 and the first area of the hole edge of the corresponding through hole may also be separated by a slight distance from the initial position. Alternatively or in addition, the first slope can be formed on the first area.

According to an embodiment not shown, at least one of the three protrusions may have an L-shaped snap surface, and the L-shaped snap surface has the first inclined surface. For example, it is possible that the L-shaped snapping surface may have two first inclined surfaces opposed to each other, which form a wedge-shaped opening, and the wedge-shaped opening may clamp the first region of the hole edge of the corresponding through hole.

When the webbing is drawn out at a constant speed, the take-up reel assembly 5 rotates at a constant speed in the unwinding direction, the control disk 4 is driven by the take-up reel assembly 5 and rotates together with the take-up reel assembly 5 at a constant speed, and the inertial element 3 is at the position of the spring element 2 Under the action of the preload force, it rotates together with the control panel 4. The reel assembly 5 drives the control disc 4 and then drives the inertial element 3 to rotate together. When the webbing is accelerated to withdraw, as the webbing withdrawing acceleration increases, the inertial force on the inertial element increases accordingly. When the extraction acceleration of the webbing reaches a first threshold, the inertial force and the pretension of the spring element are balanced. When the webbing withdrawal acceleration is further increased, the inertial force exceeds the preload of the spring element, and the inertial element 3 pivots relative to the control panel 4 until the force balance is reached again. When the extraction acceleration of the webbing is further increased to a higher second threshold value, the inertial element 3 pivots relative to the control panel 4 to the locked position, and at this time the stop element on the inertial element 3 such as the tooth portion 3.7 and the bracket provided on the bracket Or the corresponding stop element provided on the mechanical side cover 1 meshes with the corresponding tooth portion, for example, so that the control disk 4 is locked, and thus the locking of the reel assembly 5 is triggered, so that the webbing cannot continue from the reel assembly 5 Pull up.

4 is a view from the first side of the locking device in the locked position, and FIG. 5 is a view from the second side opposite to the first side of the locking device shown in FIG. 4. Here only the main components of the locking device, the control disk 4, the inertial element 3 and the spring element 2 are shown.

In the locked position of the inertial element 3, the protrusion 3.3 abuts against the second region 4.3 of the edge of the hole of the through hole matching the protrusion, and the protrusion 3.4 abuts against the hole of the through hole matching the protrusion The second region 4.5 of the rim, and the protrusion 3.5 abuts against the second region 4.7 of the hole edge of the through hole that matches the protrusion.

It goes without saying that if only one of the three projections abuts against the second area of the hole edge of the corresponding through hole in the blocking position, it is already possible to reliably ensure that the inertial element 3 is stably in the blocking position, thereby Ensure the reliable locking function of the locking device.

Similar to the arrangement of the first inclined surface, at least one of the three protrusions may also be provided with a second inclined surface at a portion cooperating with the second area. Alternatively or in addition, a second slope may also be provided on the second area. Therefore, the noise caused by the inertial element 3 in the locked position is reduced or even eliminated. In the case where all three protrusions are provided with second inclined surfaces, it is not necessary that all three second inclined surfaces are in close contact with the second region of the hole edge of the corresponding through hole.

FIG. 6 is a view of the control panel 4 as viewed from the first side, and FIG. 7 is a perspective view of the control panel 4. The details of the three through holes matching the three protrusions can be seen here. The spring seat for the spring element 2 is cylindrical. The pivot shaft 4.1 for pivotably supporting the inertial element 3 is configured as a pin, which extends vertically from the bottom of the control panel 4. The entire control panel or the main part of the control panel 4 can be integrally formed by injection molding, for example.

FIG. 8 is a perspective view of the inertial element 3, and FIG. 9 is a view from the second side of the inertial element. Here you can see the details of the three projections 3.3, 3.4, 3.5, which are respectively formed as bosses, which are arranged on the radial outer edge of the inertial element. Since these three projections as additional inertial masses are as far away from the pivot axis as possible without increasing the radial dimension, they can bring as much rotational inertia as possible under the same mass. In addition, since these three protrusions use the space already existing in the axial direction, it is also possible to increase the inertial mass and the rotational inertia of the inertial element without increasing the axial dimension. In this way, the sensitivity of the locking device is improved. The entire inertial element 3 can be made by metal die casting.

In the prior art EP2621767B1, in order to achieve noise reduction, a ramp-shaped contact slope is provided on the radial outer edge of the inertial element, which disadvantageously reduces the inertial mass away from the pivot axis and thus loses a large rotational inertia , Which reduces the sensitivity of the tape.

In the technical solution according to the present invention, it is not necessary to provide a ramp-shaped contact slope on the radially outer edge of the inertial element for noise reduction. At the same time, according to the present invention, the inertial element with protrusions and the through-hole The combined effect of the control panel can not only improve the belt sensitivity, but also reduce noise when the overall size of the seat belt retractor remains basically unchanged. In addition, the structure is simpler and easier to manufacture and assemble.

The number of protrusions and the number of through holes are schematic, it goes without saying that only one or two protrusions and through holes may be provided, or a larger number of protrusions and through holes may be provided. Each protrusion can be equipped with a through hole. It is also possible that two protrusions are provided with a through hole. However, it is particularly advantageous that the projections and the corresponding through-holes are adapted to each other in size, so that the projections have the same range of motion in the corresponding through-holes, thus minimizing the size of the respective through-holes and making the through-holes The weakening of the strength of the control panel is minimized.

The present invention is described in more detail above with the help of specific embodiments. Finally, it should be pointed out that the above-mentioned specific embodiments of the present invention are only for understanding the present invention, and do not limit the protection scope of the present invention. For those skilled in the art, modifications can be made on the basis of the foregoing embodiments, and all these modifications do not depart from the protection scope of the present invention.

Claims

A locking device for a seat belt retractor, the locking device comprising an inertial element (3) and a control panel (4), the inertial element (3) is around a pivot axis between an initial position and a locked position Pivotably supported, the inertial element (3) is provided on a control disc (4) and has a body, the control disc (4) can be driven to rotate by the reel assembly (5) of the seat belt retractor, The inertial element (3) is prestressed toward the initial position by the spring element (2), and when the reel assembly (5) is accelerated in the direction of the webbing pull-out, the inertial element (3) can be locked toward the locked position Inertial force, the inertial element (3) can be stopped in the locked position, and thus causes the locking of the seat belt retractor, characterized in that the inertial element (3) has from its body towards the control panel ( 4) A protruding protrusion, the control panel (4) has a through hole, the protrusion passes through the through hole, and the protrusion constitutes an additional inertial mass.
The locking device for a seat belt retractor according to claim 1, characterized in that the inertial element (3) has a flat body; and / or

The number of the protrusions is 1, 2, 3 or more; and / or

Each protrusion is equipped with a through hole;

Preferably, the projections and the corresponding through-holes are dimensioned such that the projections have the same range of motion in the corresponding through-holes.
The locking device for a seat belt retractor according to claim 1 or 2, wherein the protrusion is configured as a boss; and / or

The protrusion is provided on the radially outer edge of the body of the inertial element (3); and / or

The protrusion stops against the first area of the edge of the through hole in the initial position;

Preferably, the protrusion and / or the first region has a first slope, so that the inertial element is in the initial position by the spring force of the spring element in the circumferential, axial and radial directions First area support;

Preferably, the protrusion has an L-shaped snap surface, so that the inertial element is supported by the first region in the circumferential direction, the axial direction, and the radial direction under the action of the spring force of the spring element in the initial position.
The locking device for a seat belt retractor according to any one of claims 1 to 3, wherein the protrusion stops against the edge of the hole of the through hole in the locking position of the inertial element On the second area; and / or

The inertial element (3) has an arc-shaped contour on the radially outer edge; and / or

The inertial element (3) has teeth (3.7) for cooperating with corresponding teeth, which are formed on the bracket of the seat belt retractor or on the bracket On a fixedly connected component, in the initial position of the inertial element (3), the tooth (3.7) is disengaged from the corresponding tooth, and in the locked position of the inertial element (3), the tooth ( 3.7) Engage with the corresponding tooth;

Preferably, the component fixedly connected to the bracket is a mechanical side cover (1) fixed on the bracket.
The locking device for a seat belt retractor according to any one of claims 1 to 4, characterized in that the inertial element (3) has a pivot hole (3.1), and the control panel (4 ) Has a pivot shaft (4.1), and the inertial element (3) is pivotally mounted on the pivot shaft (4.1) through a pivot hole (3.1).
The locking device for a seat belt retractor according to any one of claims 1 to 5, characterized in that the control disk (4) is configured as a pot-shaped body including a bottom and A surrounding circumferential wall;

Preferably, the circumferential wall of the pot-shaped body is on one side of the bottom, or protrudes on both sides relative to the bottom;

Preferably, the circumferential wall is provided with ratchet teeth distributed on the outer circumferential surface, and the ratchet teeth are configured to cooperate with the ratchet pawls of the vehicle sensing device, so that the control disc ( 4) It is locked;

Preferably, the inertial element is provided on one side of the bottom of the control disk, and the pivot axis of the inertial element extends parallel to the axis of rotation of the control disk at a distance.
The locking device for a seat belt retractor according to any one of claims 1 to 6, characterized in that the control disk (4) can be rotatably mounted on the reel drum through a snap connection On one axial end of the assembly (5); and / or

The control panel (4) is integrally formed by injection molding.
The locking device for a seat belt retractor according to any one of claims 1 to 7, wherein the locking device further includes a locking claw and another spring element, and the control panel ( 4) With waist groove;

The locking claw is accommodated in a vacancy in one end region of the reel assembly (5), the locking claw has a pin shaft, the pin shaft is accommodated in a waist groove, the pin shaft is a roll The transmission element between the belt assembly (5) and the control panel (4);

The locking claw has a tooth portion, and the tooth portion is used to cooperate with a corresponding tooth portion, the corresponding tooth portion is configured on a bracket or a component fixedly connected to the bracket;

The additional spring element biases the locking claw in the direction of the radially inner end of the waist-shaped groove, so that the teeth of the locking claw are disengaged from the corresponding teeth; and

When the control disk (4) is locked and the take-up reel assembly (5) is rotated in the unwinding direction, the locking claws are forcibly guided so that the teeth of the locking claws mesh with the corresponding teeth, and thus the tape The cartridge assembly (5) is locked.
The locking device for a seat belt retractor according to any one of claims 1 to 8, characterized in that the spring element (2) is configured as a helical compression spring, which is supported at one end thereof On the control panel (4) and with its other end supported on the inertial element (3).
A seat belt retractor comprising a bracket and a tape drum assembly (5) rotatably supported in the bracket, characterized in that the seat belt retractor further comprises any one of claims 1 to 9 The locking device for a seat belt retractor as described in item