Active safe forced retreating mechanism, clutch mechanism and retractor

Abstract

The utility model discloses an active safety forcible retreating mechanism, clutch mechanism and retractor, active safety forcible retreating mechanism includes core shaft assembly, clutch transmission wheel, counter weight disk and shear pin, core shaft assembly includes cage body and fixed in the transmission shaft of cage body one end, the clutch transmission wheel rotatablely sleeve on the transmission shaft, the clutch transmission wheel is fixed in the cage body one end, the clutch transmission wheel is fixed in the cage body one end of the cage body one end of the cage body one end of the cage body one end of the cage body one end of the cage body one end of the cage body one end of the cage body one end of the cage body one end of the cage body. The counterweight disc is arranged on the transmission shaft in a sleeving manner and is close to an end panel of the cage body, the counterweight disc is fixed with the end panel of the cage body through the shear pin, and the counterweight disc is fixed with the clutch transmission wheel. When a passive safety system is started, smoke and fire pre-tightening is started, the mandrel assembly is quickly rewound under the action of the smoke and fire pre-tightening, the clutch transmission wheel is kept relatively static under the action of inertia force at the moment that the mandrel assembly is quickly rewound, at the moment, the shear pin is cut off by shear force, and forced quit of an active safety function is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle safety engineering, and in particular to an active safety forced retreat mechanism, a clutch mechanism and a retractor. Background Art

[0002] The seat belt retractor is a protective device to protect the safety of drivers and passengers. The existing seat belt retractor has pre-tensioning and force limiting functions. Pre-tensioning is divided into motor pre-tensioning and pyrotechnic pre-tensioning. Motor pre-tensioning is an active safety function. Before a collision, the signal is transmitted through the ECU data, and the core shaft assembly actively rewinds and tightens the webbing under the action of the motor. Pyrotechnic pre-tensioning is a passive safety function. The core shaft assembly quickly rewinds and tightens the webbing under the action of the pyrotechnic pre-tensioner. Since the motor pre-tensioning and pyrotechnic pre-tensioning share the core shaft assembly, and the motor pre-tensioning cannot affect the start of the pyrotechnic pre-tensioning, it is required that when the pyrotechnic pre-tensioning is started, no matter what state the motor pre-tensioning components are in, they must be withdrawn. In the structure of the motor pre-tensioning, the motor is connected to the core shaft assembly through a clutch assembly or a clutch transmission wheel, so a forced withdrawal mechanism is required to ensure that the clutch assembly or the clutch transmission wheel is separated from the core shaft assembly when the pyrotechnic pre-tensioning is started. Utility Model Content

[0003] To this end, the utility model provides an active safety forced retreat mechanism, a clutch mechanism and a retractor to ensure that the clutch assembly or the clutch transmission wheel is separated from the core shaft assembly when the pyrotechnic pre-tensioning is started.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] The first aspect of the present application provides an active safety forced retreat mechanism, including a core shaft assembly, a clutch transmission wheel, a counterweight plate and shear nails, the core shaft assembly includes a cage body and a transmission shaft fixed to one end of the cage body, the clutch transmission wheel is rotatably mounted on the transmission shaft, the counterweight plate is mounted on the transmission shaft and is close to the end panel of the cage body, the counterweight plate is fixed to the end panel of the cage body by the shear nails, and the counterweight plate is fixed to the clutch transmission wheel.

[0006] Furthermore, the counterweight plate is provided with a plurality of through holes for penetrating the shear pins, and the plurality of through holes are evenly distributed around the circumference of the clutch transmission wheel.

[0007] Optionally, a boss is provided on the end panel of the cage body, a mounting hole is provided at a position of the boss corresponding to the through hole, and one end of the shear nail is fixed in the mounting hole.

[0008] Furthermore, the shear nails are integrally formed on the end panel of the cage body.

[0009] Furthermore, the counterweight plate and the clutch transmission wheel are connected by bolts or formed as an integral structure.

[0010] Optionally, the counterweight plate includes a plate sleeve, a connecting plate and an annular plate, the plate sleeve is sleeved on the transmission shaft and fixed to the clutch transmission wheel, one end of the connecting plate is connected to the plate sleeve, and the other end is connected to the annular plate, the shear pins are arranged on the connecting plate, and the thickness of the annular plate is greater than the thickness of the connecting plate.

[0011] Optionally, the connecting plate is made of hard material.

[0012] Optionally, the counterweight disc is a copper disc, a steel disc or a zinc alloy disc.

[0013] A second aspect of the present application provides a clutch mechanism, which includes the active safety forced retreat mechanism provided in the first aspect of the present application.

[0014] A third aspect of the present application provides a retractor, which includes the clutch mechanism provided in the second aspect of the present application.

[0015] The utility model has the following advantages:

[0016] Under normal working conditions, the clutch drive wheel and the core shaft assembly are relatively fixed by shear pins, and the two rotate together; when the passive safety system is activated, the pyrotechnic pretensioning will be activated, and the core shaft assembly will quickly rewind under the action of the pyrotechnic pretensioning, that is, the core shaft assembly will rotate rapidly. At the moment when the core shaft assembly quickly rewinds, the clutch drive wheel will remain relatively still under the action of inertia. At this time, the shear pins will be sheared off by the shear force, and the clutch drive wheel and the core shaft assembly will no longer rotate synchronously, realizing the forced exit of the active safety function. Therefore, after the pyrotechnic pretensioning action of the passive safety is completed, the retractor force limiting function can be started normally to protect the occupants.

[0017] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0019] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment in size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0020] Figure 1 A structural schematic diagram of an active safety forced retreat mechanism provided by an embodiment of the utility model;

[0021] Figure 2 A cross-sectional view of an active safety forced retreat mechanism provided by an embodiment of the utility model;

[0022] Figure 3 A cross-sectional view of an active safety forced retreat mechanism provided in an embodiment of the utility model (the shear pins and the mandrel are assembled into an integrated structure).

[0023] Figure 4 A schematic structural diagram of a clutch transmission wheel and a counterweight plate of an active safety forced retreat mechanism provided in an embodiment of the utility model.

[0024] In the figure: 1- mandrel assembly, 11- transmission shaft, 12- end panel, 13- boss, 2- clutch transmission wheel, 3- counterweight plate, 31- plate sleeve, 32- connecting plate, 33- annular plate, 34- through hole, 4- shear nail. DETAILED DESCRIPTION

[0025] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0026] like Figure 1-4 As shown, this embodiment provides an active safety forced retreat mechanism, including a core shaft assembly 1, a clutch transmission wheel 2, a counterweight plate 3 and a shear nail 4. The core shaft assembly 1 includes a cage body and a transmission shaft 11 fixed to one end of the cage body. The clutch transmission wheel 2 is rotatably sleeved on the transmission shaft 11. The counterweight plate 3 is sleeved on the transmission shaft 11 and close to the end panel 12 of the cage body. The counterweight plate 3 is fixed to the end panel 12 of the cage body through the shear nail 4, and the counterweight plate 3 is fixed to the clutch transmission wheel 2.

[0027] Under normal working conditions, the clutch transmission wheel 2 and the core shaft assembly 1 are relatively fixed, and the two rotate together; when the passive safety system is started, the pyrotechnic pretensioning will be started, and the core shaft assembly 1 will quickly rewind under the action of the pyrotechnic pretensioning, that is, the core shaft assembly 1 rotates rapidly. At the moment when the core shaft assembly 1 quickly rewinds, the clutch transmission wheel 2 will remain relatively still under the action of inertia. At this time, the shear pins 4 will be cut off by the shear force, realizing the forced exit of the active safety function. After that, the core shaft assembly 1 can rotate freely relative to the clutch transmission wheel 2, so that after the passive safety pyrotechnic pretensioning action is completed, the retractor force limiting function can be started normally to realize the protection of the occupants.

[0028] In an optional embodiment, the counterweight plate 3 is provided with a plurality of through holes 34 for inserting the shearing pins 4, and the plurality of through holes 34 are evenly distributed around the circumference of the clutch transmission wheel 2. Generally, 2-3 shearing pins 4 are provided.

[0029] In an optional embodiment, if Figure 2 As shown, a boss 13 is provided on the end panel 12 of the cage body, and a mounting hole for fixing one end of the shear nail 4 is provided at the position of the boss 13 corresponding to the through hole 34. By providing the boss 13, the boss 13 can be closer to the counterweight plate 3, which is more conducive to shearing the shear nail 4. Optionally, the shear nail 4 is a plastic nail, an aluminum nail or a copper nail. The shear nail 4 made of this material has a certain shear resistance and is easy to be sheared; the shear nail 4 can be a pin or a screw. The pin is interference fit in the mounting hole and the through hole 34, and one end of the screw passes through the through hole 34 and is threadedly fixed in the mounting hole. In another optional embodiment, as Figure 3 As shown, the shear nail 4 is integrally formed on the end panel 12 of the cage body. In this way, there is no need to worry about the shear nail 4 accidentally falling off, and the clutch transmission wheel 2 and the core shaft assembly 1 can be ensured to rotate synchronously during the active safety process; in this solution, the shear nail 4 and the end panel 12 are made of the same material.

[0030] In an optional embodiment, the counterweight plate 3 and the clutch transmission wheel 2 are connected by bolts or formed as an integral structure.

[0031] In order to ensure that the shear nails 4 are sheared off, the moment of inertia of the counterweight plate 3 can be increased. For example, the outer diameter of the counterweight plate 3 should be as large as possible and the weight should be relatively high.

[0032] In an optional embodiment, the counterweight disc 3 includes a disc sleeve 31, a connecting plate 32 and an annular disc 33. The disc sleeve 31 is sleeved on the transmission shaft 11 and fixed to the clutch transmission wheel 2. One end of the connecting plate 32 is connected to the disc sleeve 31, and the other end is connected to the annular disc 33. The shear nails 4 are arranged on the connecting plate 32. The thickness of the annular disc 33 is greater than the thickness of the connecting plate 32. A plurality of connecting plates 32 are arranged, and the plurality of connecting plates 32 are evenly distributed on the circumference of the disc sleeve 31. The annular disc 33 is connected to the disc sleeve 31 sleeved on the transmission shaft 11 through the connecting plate 32. When the weight of the counterweight disc 3 is constant, the mass distribution can be close to the edge of the counterweight disc 3, thereby increasing the rotational inertia of the counterweight disc 3. Optionally, the connecting plate 32 is made of a hard material, such as a steel plate. Optionally, the disc sleeve 31, the connecting plate 32 and the annular disc 33 are integrally formed with the same material.

[0033] In an optional embodiment, the counterweight plate 3 is a copper plate, a steel plate or a zinc alloy plate, so that the counterweight plate 3 can be heavier.

[0034] It should be noted that the above material examples do not limit the use of other materials.

[0035] This embodiment also provides a clutch mechanism, which includes the active safety forced retreat mechanism provided in any of the above embodiments.

[0036] This embodiment also provides a retractor, which includes the clutch mechanism provided in the above embodiment.

[0037] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] The disclosure above provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0042] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An active safety forced retreat mechanism, characterized in that: It includes a core shaft assembly, a clutch transmission wheel, a counterweight plate and shear nails. The core shaft assembly includes a cage body and a transmission shaft fixed to one end of the cage body. The clutch transmission wheel is rotatably mounted on the transmission shaft. The counterweight plate is mounted on the transmission shaft and is close to the end panel of the cage body. The counterweight plate is fixed to the end panel of the cage body through the shear nails, and the counterweight plate is fixed to the clutch transmission wheel.

2. The active safety forced retreat mechanism according to claim 1, characterized in that: The counterweight plate is provided with a plurality of through holes for penetrating the shear pins, and the plurality of through holes are evenly distributed around the circumference of the clutch transmission wheel.

3. The active safety forced retreat mechanism according to claim 2, characterized in that: A boss is arranged on the end panel of the cage body, a mounting hole is arranged at a position of the boss corresponding to the through hole, and one end of the shear nail is fixed in the mounting hole.

4. The active safety forced retreat mechanism according to claim 1 or 2, characterized in that: The shear nails are integrally formed on the end panel of the cage body.

5. The active safety forced retreat mechanism according to claim 1, characterized in that: The counterweight plate and the clutch transmission wheel are connected by bolts or formed as an integral structure.

6. The active safety forced retreat mechanism according to claim 1, characterized in that: The counterweight plate includes a plate sleeve, a connecting plate and an annular plate. The plate sleeve is sleeved on the transmission shaft and fixed to the clutch transmission wheel. One end of the connecting plate is connected to the plate sleeve, and the other end is connected to the annular plate. The shear pins are arranged on the connecting plate, and the thickness of the annular plate is greater than the thickness of the connecting plate.

7. The active safety forced retreat mechanism according to claim 1, characterized in that: The counterweight plate is a copper plate, a steel plate or a zinc alloy plate.

8. A clutch mechanism, characterized in that: It comprises an active safety forced retreat mechanism as described in any one of claims 1-7.

9. A retractor, characterized in that: Comprising the clutch mechanism as claimed in claim 8.

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