Active safe forced retreating mechanism, clutch mechanism and retractor

Abstract

The utility model discloses an active safety forced retreating mechanism, a clutch mechanism and a retractor, the active safety forced retreating mechanism comprises a mandrel assembly, a clutch transmission wheel, a shear pin, a rack and a locking claw, and the mandrel assembly comprises a cage body and a transmission shaft fixed at one end of the cage body; the clutch transmission wheel is rotatably arranged on the transmission shaft in a sleeving manner and is fixed with the cage body through a shear pin, the rack is provided with a window, the edge of the window is provided with a circle of inner teeth, the locking claw is arranged between the cage body and the clutch transmission wheel, the first end of the locking claw is rotatably arranged on the shear pin in a sleeving manner, and the second end of the locking claw is provided with outer teeth matched with the inner teeth. When the passive safety system is started, the mandrel assembly is quickly rewound under the pre-tightening action of smoke and fire, the second end of the locking claw moves towards the edge of the window under the action of centrifugal force, and the outer teeth of the locking claw are clamped into the inner teeth of the window, so that the shear pin is cut off, and the forced quit of the active safety function is realized.

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 spindle assembly, a clutch transmission wheel, a shear nail, a frame, a locking claw and a reset spring, the spindle assembly including a cage body and a transmission shaft fixed to one end of the cage body, the clutch transmission wheel rotatably sleeved on the transmission shaft, and the clutch transmission wheel and the cage body are fixed by the shear nails, the frame is provided with a window, the edge of the window is provided with a circle of internal teeth, the locking claw is provided between the cage body and the clutch transmission wheel, the first end of the locking claw is rotatably sleeved on the shear nail, the second end of the locking claw extends in the opposite direction of the rapid rewinding of the spindle assembly, the second end of the locking claw and / or the side of the edge of the window are provided with external teeth adapted to the internal teeth, and a part of the reset spring acts on the locking claw to make the second end of the locking claw close to the transmission shaft.

[0006] Furthermore, the clutch transmission wheel includes a gear portion and a wheel disc, the wheel disc is coaxially arranged with the gear, and the wheel disc is fixed to a side of the gear close to the cage body, and the wheel disc is fixed to an end panel of the cage body through the shear nails.

[0007] Furthermore, the wheel disc is provided with a plurality of through holes for inserting the shear pins, the plurality of through holes are evenly distributed around the circumference of the transmission shaft, the locking claws and the shear pins are provided in plurality, and the plurality of through holes, shear pins and locking claws are arranged in one-to-one correspondence.

[0008] Optionally, the wheel disc and the gear portion are formed as an integral structure.

[0009] Optionally, the shear nails are integrally formed on the end panel of the cage body.

[0010] Optionally, a mounting hole is provided on the end panel of the cage body at a position corresponding to the through hole, and one end of the shear nail is fixed in the mounting hole.

[0011] Optionally, the shear nails are plastic nails, aluminum nails or copper nails.

[0012] 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.

[0013] A third aspect of the present application provides a retractor, which includes the clutch mechanism provided in the second aspect of the present application.

[0014] The utility model has the following advantages:

[0015] Under normal working conditions, the clutch transmission wheel and the mandrel assembly are relatively fixed by the shear pins, and the two rotate together; the locking claw is in a state of holding the transmission shaft under the action of the reset spring. When the passive safety system is activated, the pyrotechnic preload will be activated, and the mandrel assembly will rewind quickly under the action of the pyrotechnic preload, that is, the mandrel assembly rotates rapidly. At the moment when the mandrel assembly rewinds quickly, due to the too fast rewinding speed, the force of the reset spring is difficult to keep the locking claw in a state of holding the transmission shaft. The second end of the locking claw moves toward the edge of the window under the action of centrifugal force and the outer teeth of the locking claw are stuck in the inner teeth of the window. At this time, the mandrel assembly is in a state of rapid rewinding, while the locking claw and the frame remain stationary. The first end of the locking claw acts on the shear pins to cut the shear pins. After the shear pins are cut, the clutch transmission wheel can rotate relative to the transmission shaft, and the two no longer rotate synchronously, realizing the forced exit of the active safety function. Therefore, after the pyrotechnic preload action of the passive safety is completed, the force limiting function of the retractor can be started normally to protect the occupants.

[0016] 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

[0017] 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.

[0018] 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.

[0019] Figure 1 A schematic structural diagram of a mandrel assembly and a frame of an active safety forced retreat mechanism provided in an embodiment of the utility model;

[0020] Figure 2 A schematic structural diagram of a spindle assembly and a clutch transmission wheel of an active safety forced retreat mechanism provided in an embodiment of the utility model;

[0021] Figure 3 A structural schematic diagram of an active safety forced retreat mechanism provided by an embodiment of the utility model;

[0022] Figure 4 A schematic diagram of the position of a locking claw of an active safety forced retreat mechanism provided by an embodiment of the utility model when the locking claw is not retreated;

[0023] Figure 5 A schematic diagram of the position of a locking claw of an active safety forced retreat mechanism during retreat provided by an embodiment of the utility model;

[0024] Figure 6 A schematic cross-sectional view of an active safety forced retreat mechanism provided in an embodiment of the utility model;

[0025] Figure 7 for Figure 6 A magnified view of middle;

[0026] Figure 8 A schematic cross-sectional structure diagram of an active safety forced retreat mechanism provided in an embodiment of the utility model (shear pins and end panels are integrally formed as a structure).

[0027] In the figure: 1-core shaft assembly, 11-cage, 12-transmission shaft, 13-end panel, 2-clutch transmission wheel, 21-gear part, 22-wheel plate, 3-shear nail, 4-frame, 41-inner teeth, 5-locking claw, 51-outer teeth, 6-reset spring. DETAILED DESCRIPTION

[0028] 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.

[0029] like Figure 1-8 As shown, this embodiment provides an active safety forced retreat mechanism, which includes a spindle assembly 1, a clutch transmission wheel 2, a shearing nail 3, a frame 4, a locking claw 5 and a reset spring 6. The spindle assembly 1 includes a cage 11 and a transmission shaft 12 fixed to one end of the cage 11. The clutch transmission wheel 2 is rotatably sleeved on the transmission shaft 12, and the clutch transmission wheel 2 and the cage 11 are fixed by the shearing nail 3. The frame 4 is provided with a circular window, and a circle of internal teeth 41 is provided on the edge of the window; the frame 4 can be a frame 4 of a clutch or a retractor, or a frame 4 shared by a clutch and a retractor. The locking claw 5 is provided between the cage 11 and the clutch transmission wheel 2, the first end of the locking claw 5 is rotatably sleeved on the shearing nail 3, and the second end of the locking claw 5 and / or the side facing the edge of the window are provided with external teeth 51 adapted to the internal teeth 41. A part of the reset spring 6 acts on the locking claw 5 to make the second end of the locking claw 5 close to the transmission shaft 12.

[0030] Under normal working conditions, the clutch transmission wheel 2 and the core shaft assembly 1 are relatively fixed by the shear nails 3, and the two rotate together; the locking claw 5 is in a state of holding the transmission shaft 12 under the action of the return spring 6. When the passive safety system is started, the pyrotechnic pretensioning will be activated, and the core shaft assembly 1 will rewind quickly 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 rewinds quickly, due to the too fast rewinding speed, the force of the return spring 6 is difficult to keep the locking claw 5 in a state of holding the transmission shaft 12. The second end of the locking claw 5 moves toward the edge of the window under the action of centrifugal force and the outer tooth 51 of the locking claw 5 is stuck in the inner tooth 41 of the window. At this time, the core shaft assembly 1 is in rapid rewinding, and the locking claw 5 and the frame 4 remain stationary. The first end of the locking claw 5 acts on the shear nail 3 to cut the shear nail 3. After the shear nail 3 is cut, the clutch transmission wheel 2 can rotate relative to the transmission shaft 12, and the two 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 force limiting function of the retractor can be normally started to protect the occupants.

[0031] Optimally, when the outer teeth 51 of the locking claw 5 are stuck in the inner teeth 41 of the window of the frame 4, the force of the inner teeth 41 on the outer teeth 51 is directed to the shear nail 3. To achieve this purpose, when designing, the shape of the locking claw 5, the shape of the outer teeth 51 and the shape of the inner teeth 41 can be designed to make the force directed to the shear nail 3 as much as possible, which is a conventional technical means.

[0032] In the present application, the second end of the locking claw 5 extends in the opposite direction of the rapid rewinding of the core shaft assembly 1, so that the second end of the locking claw 5 can perform centrifugal motion; when the outer teeth 51 of the locking claw 5 interact with the inner teeth 41 of the window, the force exerted by the inner teeth 41 on the outer teeth 51 is a "pushing force".

[0033] In this embodiment, the clutch transmission wheel 2 includes a gear portion 21 and a wheel disc 22. The wheel disc 22 is coaxially arranged with the gear and fixed to a side of the gear close to the cage body 11. The wheel disc 22 is fixed to the end panel 13 of the cage body 11 by shear nails 3.

[0034] In this embodiment, the wheel disc 22 is provided with a plurality of through holes for inserting the shearing nails 3, and the plurality of through holes are evenly distributed around the circumference of the transmission shaft 12. The locking claws 5 and the shearing nails 3 are provided with a plurality of through holes, and the plurality of through holes, the shearing nails 3 and the locking claws 5 are provided in a one-to-one correspondence. Generally, 2-3 shearing nails 3 are provided, and correspondingly, 2-3 through holes and locking claws 5 are provided respectively.

[0035] In an optional embodiment, if Figure 6 As shown, a mounting hole for fixing one end of the shear nail 3 is provided on the end panel 13 of the cage body 11. Optionally, the shear nail 3 can be a pin or a screw, the pin is interference-fitted in the mounting hole and the through hole, and one end of the screw is threadedly fixed in the mounting hole after passing through the through hole; the shear nail 3 is a plastic nail, an aluminum nail or a copper nail, and the shear nail 3 of this material has a certain shear resistance and is also easy to be sheared. In another optional embodiment, as Figure 8 As shown, the shear nail 3 is integrally formed on the end panel 13 of the cage body 11, so there is no need to worry about the shear nail 3 accidentally falling off, and the clutch transmission wheel 2 and the core shaft assembly 1 can be guaranteed to rotate synchronously during the active safety process; in this solution, the shear nail 3 and the end panel 13 are made of the same material.

[0036] In an optional embodiment, the wheel disc 22 and the gear part 21 are formed in an integral structure. The wheel disc 22 and the gear part 21 formed in an integral structure have better structural strength.

[0037] It should be noted that the above material examples do not limit the use of other materials.

[0038] The return spring 6 can be a torsion spring, which is sleeved on the transmission shaft 12, with one end acting on the locking claw 5 and the other end fixed relative to the end panel 13. The return spring 6 has various forms, and the present application does not limit the type and specific setting of the return spring 6, as long as the locking claw 5 can hold the transmission shaft 12 when there is no centrifugal force or the centrifugal force is small.

[0039] This embodiment also provides a clutch mechanism, which includes the active safety forced retreat mechanism provided in any of the above embodiments.

[0040] This embodiment also provides a retractor, which includes the clutch mechanism provided in the above embodiment.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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: The cam is an angular channel that is fixed to the side of the gear train with a plurality of teeth, the plurality of teeth being coupled to the gear train and the plurality of teeth being coupled to the gear train.

2. The active safety forced retreat mechanism according to claim 1, characterized in that: The clutch transmission wheel comprises a gear part and a wheel disc, wherein the wheel disc is coaxially arranged with the gear and fixed on a side of the gear close to the cage body, and the wheel disc is fixed to an end panel of the cage body through the shear nails.

3. The active safety forced retreat mechanism according to claim 2, characterized in that: The wheel disc is provided with a plurality of through holes for inserting the shear pins, and the plurality of through holes are evenly distributed around the circumference of the transmission shaft. The locking claws and the shear pins are both provided in plurality, and the plurality of through holes, shear pins and locking claws are provided in one-to-one correspondence.

4. The active safety forced retreat mechanism according to claim 2, characterized in that: The wheel disc and the gear portion are formed as an integral structure.

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

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

7. The active safety forced retreat mechanism according to claim 6, characterized in that: The shear nails are plastic nails, aluminum nails or copper nails.

8. A clutch mechanism, characterized in that: It comprises the 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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