A force limiting device for a shackle

Abstract

The application discloses a force limiting device of a lock catch, which comprises a support, a mandrel, a torsion bar and a connecting rope; the support is fixed on a vehicle body part, both ends of the mandrel are rotatably supported on the support, the torsion bar is coaxially arranged inside the mandrel, the torsion bar comprises a first part fixed on the support and a second part synchronously rotatable with the mandrel, the connecting rope is used for connecting the lock catch and the mandrel, and a hook assembly is arranged on the mandrel; the connecting rope comprises a first folded end and two wire segments extending from the first folded end, the first folded end is fixed on the hook assembly, and the two wire segments are wound on the outer circumferential surface of the mandrel and then extend from the inside of the first folded end to be fixedly connected with the lock catch. The application does not need to process the mandrel in a large area and does not need to preset a connecting piece on the connecting rope, thereby solving the problems of complex structure and high processing difficulty between the mandrel and the steel wire rope in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile safety belts, and in particular to a force limiting device for a buckle. Background Art

[0002] The mainstream seat belts on the market are usually equipped with a pre-tensioning device and a force limiting device at the shoulder belt position. In the event of an emergency in the vehicle, the pre-tensioning device and the force limiting device work together to limit displacement and improve the force acting on the occupant's shoulder belt. Therefore, existing seat belt buckles also use torsion force limiting devices to improve the seat belt buckles. For example, in the solutions recorded in patent application numbers 202311032328.7 and CN202211529964.6, one end of the steel wire rope is connected to the buckle, and the other end is connected to the core shaft in the torsion force limiting device. When the buckle is pulled, the steel wire rope drives the core shaft to rotate to adjust the tightness of the seat belt through the buckle, thereby improving the force acting on the occupant by the seat belt.

[0003] In the prior art, when connecting a wire rope to a mandrel, a relatively large connecting hole or groove is directly made on the mandrel to connect with a connecting rod or a connecting piece corresponding to the groove, and the wire rope is then wound in a fixed winding manner. The relatively large connecting hole or groove on the mandrel, and the need to adapt the relatively large connecting hole and groove to the relatively large connecting piece on the wire rope, undoubtedly increase the difficulty of machining the mandrel, as well as the difficulty of machining the wire rope and the wire rope connecting piece.

[0004] Based on this, a new technical solution is needed to solve the problems of complex structure and high processing difficulty between the core shaft and the wire rope in the existing technology. Summary of the Invention

[0005] In view of this, an embodiment of the present invention provides a force limiting device for a lock, so as to at least solve the problem of complex structure and high processing difficulty between the core shaft and the wire rope in the prior art.

[0006] The embodiments of the present invention provide the following technical solutions:

[0007] An embodiment of the present invention provides a force-limiting device for a lock buckle, comprising a bracket, a core shaft, a torsion bar, and a connecting rope; the bracket is fixed to a vehicle body component, the two ends of the core shaft are rotatably supported on the bracket, the torsion bar is coaxially disposed within the core shaft, and the torsion bar includes a first portion fixed to the bracket and a second portion that can rotate synchronously with the core shaft; the connecting rope is used to connect the lock buckle and the core shaft, and the core shaft is provided with a hook assembly;

[0008] The connecting rope includes a first folded end and two linear segments extending from the first folded end, the first folded end is fixed to the hook assembly, and the two linear segments are wound around the outer circumference of the core shaft and then extend from the inside of the first folded end to be fixedly connected to the lock buckle;

[0009] Among them, in the initial stage, the intersection of the non-winding part of the linear segment and the outer peripheral surface of the core shaft and the hook assembly have a preset distance in the winding direction of the winding part of the linear segment; in the force limiting stage, after the force applied to the lock reaches a preset threshold, it drives the core shaft and the second part of the torsion bar to rotate, so that the lock can move in the direction away from the core shaft; in the force limiting end stage, the first folded end rotates with the core shaft to the intersection of the non-winding part of the linear segment and the outer peripheral surface of the core shaft, and the lock stops moving.

[0010] Furthermore, the hook assembly is a detachable separate component, comprising a limiting end and a fixed end, the limiting end being used for limiting connection with the core shaft, and the fixed end being fixed to the first folded end;

[0011] The core shaft is provided with a core shaft hole, which includes a long side greater than or equal to the length of the limiting end and a short side less than the length of the limiting end. The limiting end is configured to be inserted into the interior of the core shaft from the long side and then slide to the short side to achieve snap connection.

[0012] Furthermore, the hook assembly is formed by bending a linear integral piece, and includes a limiting width portion, a linear narrow portion, and a second flange portion arranged in sequence. An opening is formed on the limiting width portion. After the first folded end is placed on the linear narrow portion, the second flange portion is wrapped around the first folded end and then inserted into the opening.

[0013] The limiting wide portion forms the limiting end, and the space surrounded by the linear narrow portion forms the fixed end.

[0014] Furthermore, the core shaft hole is a cross hole, including the long side located in the middle and the two short sides located on both sides of the long side, the width of the limiting wide portion matches the length of the long side, and the length of the linear narrow portion matches the short side;

[0015] Furthermore, the ends of the two linear segments are fixedly connected by rivets, and the non-wrapped portion of one linear segment is bent to form a second folded end, and the second folded end is used to be connected to the lock buckle.

[0016] Further, the support is an integral piece, sequentially comprising a fixing arm, a first vertical arm, a connecting arm and a second vertical arm, the fixing arm is fixedly connected with a vehicle body part, the mandrel is rotatably fixed between the first vertical arm and the second vertical arm, the connecting arm is provided with a guide hole, and the two linear segments are fixedly connected with the lock catch and extend from the guide hole.

[0017] Further, the first vertical arm is provided with a first opening and a first flange portion surrounding the first opening, and the second vertical arm is provided with a receiving portion matched with the end portion of the mandrel.

[0018] The mandrel axially passes through the first opening and abuts in the receiving portion, and the first flange portion is pressed and riveted to achieve rotatable fixation of the mandrel.

[0019] Further, the receiving portion is provided with a second opening, the end portion of the mandrel away from the receiving portion is provided with a third opening, the torsion rod is in a dumbbell shape, the first portion is located at one end of the torsion rod and fixed in the second opening, and the second portion is located at the other end of the torsion rod and fixed in the third opening.

[0020] Further, the end portion of the mandrel provided with the third opening is provided with a limiting step outside the third opening to form a predetermined step surface between the limiting step and the edge of the third opening.

[0021] Further, the second opening and the third opening are both polygonal holes, the end portion of the first portion and the end portion of the second portion of the torsion rod are both provided with polygonal structures and are both provided with protrusions outside the polygonal structures, so that the end portion of the first portion of the torsion rod is in interference fit with the second opening, and the end portion of the second portion of the torsion rod is in interference fit with the third opening.

[0022] Compared with the prior art, the above-mentioned at least one technical scheme adopted by the embodiment of the present application can achieve at least the following beneficial effects:

[0023] The force limiting device of the lock catch of the present application is provided with a hook assembly on the mandrel, the first folded end formed by folding the connecting rope is connected with the hook assembly, and then the two linear segments extending from the first folded end are fixedly connected with the lock catch and extend from the inside of the first folded end, so that when the lock catch is pulled, the connecting rope drives the mandrel and the torsion rod to rotate through the hook assembly, thereby solving the problems of complex structure and high processing difficulty between the mandrel and the steel wire rope. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 This is a schematic structural diagram of a force limiting device for a lock according to an embodiment of the present invention;

[0026] Figure 2 This is an exploded view of a force limiting device of a lock according to an embodiment of the present invention;

[0027] Figure 3 Schematic diagram of the structure of the bracket according to the embodiment of the present invention (1);

[0028] Figure 4 This is a schematic structural diagram of a bracket according to an embodiment of the present invention (II);

[0029] Figure 5 A schematic structural diagram of a core shaft according to an embodiment of the present invention;

[0030] Figure 6 Schematic diagram of the structure of a torsion bar according to an embodiment of the present invention;

[0031] Figure 7 This is a structural schematic diagram of the first folded end being mounted to the hook assembly according to an embodiment of the present invention;

[0032] Figure 8 FIG2 is a diagram illustrating the assembly process of the first folded end, the hook assembly, and the core shaft according to an embodiment of the present invention;

[0033] Figure 9 This is a schematic structural diagram of the connecting rope, hook assembly, core shaft and torsion bar in an initial state according to an embodiment of the present invention;

[0034] Figure 10 Schematic diagram of the structure after the connecting rope, hook assembly, core shaft and torsion bar are rotated according to an embodiment of the present invention.

[0035] The accompanying drawings of the present invention are as follows:

[0036] 10. Bracket; 11. Fixed arm; 12. First vertical arm; 121. First opening; 122. First flange portion; 13. Connecting arm; 14. Second vertical arm; 141. Accommodating portion; 142. Second opening; 15. Guide hole;

[0037] 20. Mandrel; 21. Mandrel hole; 211. Long side; 212. Short side; 22. Third opening; 23. Positioning step; 24. Pre-positioning step surface;

[0038] 30. Torsion bar; 31. Protrusion;

[0039] 40. Connecting rope; 41. First folded end; 42. Linear segment; 421. Non-wrapped portion; 422. Wrapped portion; 43. Rivet;

[0040] 50, hook assembly; 51, limiting end; 511, limiting wide portion; 5112, opening; 52, fixed end; 521, linear narrow portion; 522, second flange portion;

[0041] 60. Lock. DETAILED DESCRIPTION

[0042] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0043] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0044] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0045] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0046] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples, however, one skilled in the art will appreciate that the examples can be practiced without these specific details.

[0047] In the prior art, when connecting a wire rope to a core shaft 20, a first connector is usually pre-set on the wire rope, a second connector is pre-set on the core shaft 20, and then the wire rope is wound around the core shaft 20 in a specific manner, and the first connector and the second connector are then matched and connected. Since the position of the second connector is fixed, the wire rope needs to be reserved for a corresponding length and wound in a fixed winding method to enable the first connector and the second connector to be matched and connected, which undoubtedly increases the difficulty of connecting the wire rope to the core shaft 20.

[0048] Based on this, this specification proposes a solution: Figure 1 As shown, the present invention provides a force-limiting device for a lock buckle. A hook assembly 50 is provided on a core shaft 20. A first folded end 41, formed by folding a connecting rope 40 in half, is placed over the hook assembly 50. Two linear segments 42 are then passed through the first folded end 41 and fixedly connected to a lock buckle 60. As a result, when the lock buckle 60 is pulled, the connecting rope 40, hook assembly 50, and core shaft 20 can drive the torsion bar 30 to twist. This invention eliminates the need for extensive machining of the core shaft 20 and pre-installed connectors on the connecting rope 40, thereby resolving the problems of the complex structure and high machining difficulty associated with the prior art between the core shaft 20 and the wire rope.

[0049] The following describes the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings.

[0050] like Figures 1 to 6 As shown, a force limiting device of a lock of the present invention includes a bracket 10, a core shaft 20, a torsion bar 30 and a connecting rope 40; the bracket 10 is fixed to the vehicle body component, both ends of the core shaft 20 are rotatably supported on the bracket 10, the torsion bar 30 is coaxially arranged inside the core shaft 20, and the torsion bar 30 includes a first part fixed to the bracket 10 and a second part that can rotate synchronously with the core shaft 20, the connecting rope 40 is used to connect the lock 60 and the core shaft 20, and a hook assembly 50 is provided on the core shaft 20.

[0051] The bracket 10 is used to provide installation support, and is mainly used to rotatably support the core shaft 20 and fixedly support the first part of the torsion bar 30 .

[0052] In one embodiment of the present invention, Figures 3 and 4As shown, the bracket 10 is an integral part, which includes a fixed arm 11, a first vertical arm 12, a connecting arm 13 and a second vertical arm 14 in sequence. The fixed arm 11 is fixedly connected to the vehicle body component, and the core shaft 20 is rotatably fixed between the first vertical arm 12 and the second vertical arm 14. A guide hole 15 is opened on the connecting arm, and two linear segments 42 extend from the guide hole 15 and are fixedly connected to the lock buckle 60.

[0053] Specifically, the fixed arm 11 is horizontally connected to the bottom end of the first vertical arm 12, and a slot is provided on it for connection to the vehicle body parts; the first vertical arm 12 is vertically arranged, and its end away from the fixed arm 11 is connected to the connecting arm 13, and the connecting arm 13 is horizontally arranged; the second vertical arm 14 is vertically arranged and arranged opposite to the first vertical arm 12, and together with the first vertical arm 12 and the connecting arm 13 form a U-shaped structure.

[0054] In other embodiments, the bottom end of the second vertical arm 14 may be horizontally connected to another fixed arm 11 , and the other fixed arm 11 is connected to the vehicle body component to increase the connection strength between the bracket 10 and the vehicle body component.

[0055] The guide hole 15 is used to limit the pulling-out position and direction of the connecting rope 40 .

[0056] The number and position of the guide holes 15 are related to the rotation angle of the hook assembly 50 and the torsion bar 30 , and they can be set at different positions or numbers according to the different rotation angles of the hook assembly 50 and the second portion of the torsion bar 30 .

[0057] For example, the number of guide holes 15 can be one and the guide hole 15 can be located in the middle of the connecting arm 13 .

[0058] Preferably, there may be two guide holes 15 , which are spaced apart on the connecting arm 13 , so as to adapt to different seats in the transverse direction of the vehicle.

[0059] Furthermore, the first vertical arm 12 is provided with a first opening 121 and a first flange portion 122 surrounding the first opening 121, and the second vertical arm 14 is provided with a receiving portion 141 matching the end of the core shaft 20; wherein, the core shaft 20 axially passes through the first opening 121 and abuts against the receiving portion 141, and then the first flange portion 122 is riveted to achieve rotatable fixation of the core shaft 20.

[0060] Among them, the accommodating portion 141 is a groove-shaped structure, the interior of which is used to accommodate one end of the core shaft 20 and rotatably support one end of the core shaft 20, and the outer side of the accommodating portion 141 is a closed structure, which is used to limit the core shaft 20 from moving outward between the first vertical arm 12 and the second vertical arm 14.

[0061] The first opening 121 is used to accommodate the other end of the core shaft 20 and rotatably support the other end of the core shaft 20 .

[0062] The first flange portion 122 is used to restrict the core shaft 20 from escaping from the first opening 121 , so that the core shaft 20 is confined between the first vertical arm 12 and the second vertical arm 14 .

[0063] Specifically, the core shaft 20 is inserted between the first vertical arm 12 and the second vertical arm 14 along the axial direction of the first opening 121, and one end of the core shaft 20 is placed in the accommodating portion 141, and the other end of the core shaft 20 is placed in the first opening 121, and then the first flanging portion 122 is riveted to rotatably support the core shaft 20 between the first vertical arm 12 and the second vertical arm 14, so that the core shaft 20 can only rotate in the first opening 121 and the accommodating portion 141.

[0064] Furthermore, the accommodating portion 141 is provided with a second opening 142, and the end of the core shaft 20 away from the accommodating portion 141 is provided with a third opening 22. The torsion bar 30 is a dumbbell-shaped structure, the first part is located at one end of the torsion bar 30 and is fixed in the second opening 142, and the second part is located at the other end of the torsion bar 30 and is fixed in the third opening 22.

[0065] Among them, the second opening 142 is used to fix and support the end of the first part of the torsion bar 30 to prevent the end of the first part of the torsion bar 30 from rotating with the core shaft 20; the third opening 22 is used to fix and support the end of the second part of the torsion bar 30, and when the core shaft 20 rotates, the core shaft 20 can drive the second part of the torsion bar 30 to rotate through the third opening 22.

[0066] Specifically, after the core shaft 20 is installed, the torsion bar 30 is inserted into the core shaft 20 axially along the core shaft 20, and the end of the first part of the torsion bar 30 is embedded in the second opening 142, and the end of the second part of the torsion bar 30 is embedded in the third opening 22. Since the closed part on the bracket 10 is fixedly installed, when the core shaft 20 rotates, the core shaft 20 can drive the second part of the torsion bar 30 to twist relative to the first part of the torsion bar 30 through the third opening 22.

[0067] like Figure 5 As shown, one end of the core shaft 20 is provided with a third opening 22 and a limiting step 23 is provided on the periphery of the third opening 22 to form a pre-positioning step surface 24 between the limiting step 23 and the edge of the third opening 22, so as to facilitate the end of the first part of the torsion bar 30 to be embedded in the second opening 142.

[0068] The size of the pre-positioning step surface 24 matches the size of the end of the second portion of the torsion bar 30 to pre-position the end of the second portion of the torsion bar 30 so as to facilitate inserting the end of the first portion of the torsion bar 30 into the second opening 142 .

[0069] For example, when the pre-positioning step surface 24 is a circular structure and the end of the second part of the torsion rod 30 is a polygonal structure, the diameter of the pre-positioning step surface 24 is equal to the maximum length of the end of the second part of the torsion rod 30, so that after the first part of the torsion rod 30 is inserted into the core shaft 20, the end of the second part of the torsion rod 30 is embedded in the pre-positioning step surface 24, and the end of the second part of the torsion rod 30 is tightly attached to the pre-positioning step surface 24, so that the part of the torsion rod 30 located in the core shaft 20 remains horizontal, so that the end of the first part of the torsion rod 30 can be inserted into the second opening 142.

[0070] like Figures 5 and 6 As shown, the second opening 142 and the third opening 22 are both polygonal holes, and the end of the first part and the end of the second part of the torsion bar 30 are both set to polygonal structures, and their outer peripheries are provided with protrusions 31, so that the end of the first part of the torsion bar 30 is interference fit with the second opening 142, and the end of the second part of the torsion bar 30 is interference fit with the third opening 22.

[0071] For example, the second opening 142 and the third opening 22 are both hexagonal through holes, and both ends of the torsion bar 30 are also configured as hexagonal structures.

[0072] Among them, the second opening 142 and the third opening 22 are set as polygonal holes, and the two ends of the torsion bar 30 are set as polygonal structures, so that the end of the first part of the torsion bar 30 can be limited and fixed by the second opening 142, and the core shaft 20 can drive the torsion bar 30 to twist through the third opening 22.

[0073] Among them, by using the protrusion 31, the end of the first part of the torsion bar 30 is interference fit with the second opening 142, and the end of the second part of the torsion bar 30 is interference fit with the third opening 22, the end size of the first part of the torsion bar 30 can be appropriately reduced, thereby reducing the difficulty of inserting the end of the first part of the torsion bar 30 into the second opening 142.

[0074] The hook assembly 50 of the present application may be a hook-shaped structure; or one end of the hook assembly 50 may be sleeved, snapped or bolted to the first folded end 41 , and the other end may be fixedly or detachably connected to the core shaft 20 .

[0075] When the hook assembly 50 of the present application is a hook-shaped structure, the first folded end 41 is sleeved on the hook-shaped structure and can pull the hook-shaped structure to drive the core shaft 20 to rotate.

[0076] like Figure 2 、 7As shown in ~10, the connecting rope 40 includes a first folded end 41 and two linear segments 42 extending from the first folded end 41, the first folded end 41 is fixed on the hook assembly 50, and the two linear segments 42 are wrapped around the outer circumference of the core shaft 20 and then extend from the inside of the first folded end 41 to be fixedly connected to the lock buckle 60; wherein, in the initial stage, the intersection of the non-wound portion 421 of the linear segment 42 and the outer circumference of the core shaft 20 and the hook assembly 50 have a preset distance in the winding direction of the wound portion 422 of the linear segment 42; in the force limiting action stage, after the force on the lock buckle 60 reaches the preset threshold, it drives the core shaft 20 and the second part of the torsion bar 30 to rotate, so that the lock buckle 60 can move in the direction away from the core shaft 20; in the end stage of force limiting, the first folded end 41 rotates with the core shaft 20 to the intersection of the non-wound portion 421 of the linear segment 42 and the outer circumference of the core shaft 20, and the lock buckle 60 stops moving.

[0077] In the present application, by pulling the non-wrap parts 421 of the two linear segments 42, the wrapping parts 422 of the linear segments 42 can be wrapped more tightly on the outer peripheral surface of the core shaft 20, and the first folded end 41 can pull the core shaft 20 to rotate through the hook assembly 50.

[0078] The connecting rope 40 may be a steel wire rope.

[0079] Among them, the connecting rope 40 can be folded in half from the approximate middle to form a first folded end 41, the linear portions extending from both ends of the first folded end 41 and wrapped around the outer peripheral surface of the core shaft 20 are the wrapped portions 422, and the portions not wrapped around the core shaft 20 are the non-wrapped portions 421.

[0080] The intersection of the unwound portion 421 of the linear segment 42 and the outer circumference of the mandrel 20 is the portion where the end of the unwound portion 421 closest to the outer circumference of the mandrel 20 contacts the outer circumference of the mandrel 20. The winding direction of the winding portion 422 of the linear segment 42 is substantially the same as the circumferential direction of the outer circumference of the mandrel 20.

[0081] By setting the hook component 50 to have a preset distance from the intersection in the winding direction of the winding portion 422, after the hook component 50 is pulled by the first folded end 41, the hook component 50 can drive the core shaft 20 to rotate and rotate close to the intersection.

[0082] Specifically, if Figures 9 and 10 As stated, Figure 9 is the initial position of the hook assembly 50, Figure 10 This is the position of the hook component 50 after rotating with the core shaft 20. When the hook component 50 is pulled by the first folded end 41, it rotates along the winding direction of the winding portion 422 with the core shaft 20 to approach the intersection, so that the winding portion 422 of the linear segment 42 is released and the non-winding portion 421 is extended.

[0083] The preset distance can be flexibly set according to actual needs, and the maximum value of the preset distance is the circumference of the outer periphery of the core shaft 20.

[0084] Among them, after the force applied to the lock buckle 60 reaches a preset threshold, the lock buckle 60 can overcome the torsional force of the torsion bar 30 through the connecting rope 40 and the core shaft 20, so that the second part of the torsion bar 30 is twisted relative to the first part.

[0085] Among them, according to the different pulling force values ​​or pulling time applied to the lock 60, the rotation angles of the core shaft 20 and the torsion bar 30 are different, so the first folded end 41 and the hook assembly 50 rotate with the core shaft 20 and the torsion bar 30 at most to coincide with the intersection.

[0086] According to the different positions of the guide holes 15 on the connecting arm 13 of the bracket 10 , the distance that the first folded end 41 pulls the hook assembly 50 to rotate is also different.

[0087] For example, when the guide hole 15 corresponds to the center position of the core shaft 20 in vertical correspondence, the hook assembly 50 can rotate with the core shaft 20 to coincide with the intersection; when the guide hole 15 does not correspond to the center position of the core shaft 20 in vertical correspondence, the connecting rope 40 is restricted by the guide hole 15 and may not be able to drive the hook assembly 50 to rotate to coincide with the intersection.

[0088] In some of these embodiments, Figures 7 and 8 As shown, the hook assembly 50 is a detachable separate component, including a limiting end 51 and a fixed end 52, the limiting end 51 is used to limit the connection with the core shaft 20, and the fixed end 52 is fixed to the first folded end 41; the core shaft 20 is provided with a core shaft hole 21, the core shaft hole 21 includes a long side 211 greater than or equal to the length of the limiting end 51 and a short side 212 less than the length of the limiting end 51, and the limiting end 51 is configured to be inserted into the interior of the core shaft 20 from the long side 211, and then slide to the short side 212 to achieve snap connection.

[0089] The limiting end 51 is used to fix the hook assembly 50 to the core shaft 20 , and the fixing end 52 is used to connect with the first folded end 41 , so that the first folded end 41 can pull the limiting end 51 through the fixing end 52 .

[0090] The core shaft 20 is a hollow cavity structure. The core shaft hole 21 is opened on the wall of the core shaft 20 and is a long slot hole, and is connected with the interior of the core shaft 20.

[0091] For example, the limiting end 51 can be a convex plate-shaped structure, which is inserted into the core shaft 20 along the long side 211 of the core shaft hole 21, so that the end with a smaller width is located in the core shaft hole 21, and after sliding to the short side 212, the end with a longer width is limited by the wall of the core shaft 20 and cannot be separated from the core shaft hole 21, thereby achieving the limiting end 51 being fixed to the core shaft 20.

[0092] For another example, the limiting end 51 can be a roughly L-shaped structure, and its transverse portion can be inserted into the core shaft hole 21 along the long side 211 , and when sliding to the short side 212 , the limiting end 51 is stuck on the side wall of the core shaft hole 21 .

[0093] In some embodiments, the hook assembly 50 is formed by bending a linear integral part, including a limiting width portion 511, a linear narrow portion 521 and a second flange portion 522 arranged in sequence, an opening 512 is formed on the limiting width portion 511, and after the first folded end 41 is placed on the linear narrow portion 521, the second flange portion 522 is wrapped around the first folded end 41 and then embedded in the opening 512; the limiting width portion 511 forms the limiting end 51, and the space surrounded by the linear narrow portion 521 forms the fixed end 52.

[0094] Among them, the hook assembly 50 includes an open state and a closed state. The open state is a state in which the second flange portion 522 is not inserted into the opening 512 on the limiting width portion 511 and the linear narrow portion 521 is not surrounded to form a space for accommodating the first folded end 41; the closed state is a state in which the second flange portion 522 is wrapped around the first folded end 41 and then embedded in the opening 512 so that the linear narrow portion 521 forms a space for accommodating the first folded end 41.

[0095] The first folded end 41 is wrapped around or attached to the linear narrow portion 521 when the hook assembly 50 is in the open state, and is limited by the linear narrow portion 521 when the hook assembly 50 is in the closed state.

[0096] Among them, the hook component 50 is a plate-type structure as a whole, and the width of the limiting wide part 511 is greater than the width of the linear narrow part 521. After the limiting wide part 511 is inserted into the core shaft hole 21 and inserted into the core shaft 20, the limiting wide part 511 is twisted and the two ends of the limiting wide part 511 are stuck on the inner sides of the side walls of the core shaft hole 21. Finally, the linear narrow part 521 is pulled to the short side 212 of the core shaft hole 21 to limit the hook component 50 to the core shaft hole 21.

[0097] When the second flange portion 522 is inserted through the opening 512 so that the linear portion is located in the core shaft hole 21 , the second flange portion 522 is blocked by the side wall of the opening 512 so that the second flange portion 522 is limited to the limiting wide portion 511 .

[0098] Furthermore, the core shaft hole 21 is a cross hole, including a long side 211 located in the middle and two short sides 212 located on both sides of the long side 211. The width of the limiting wide portion 511 matches the length of the long side 211, and the length of the linear narrow portion 521 matches the short side 212.

[0099] Among them, a convex structure is formed near the connection between the limiting width portion 511 and the linear portion, so that after the limiting width portion 511 passes through the core shaft hole 21 along the long side 211 of the core shaft hole 21 and enters the core shaft 20, the limiting width portion 511 is pulled to the short side 212 through the linear portion, so that the limiting width portion 511 is stuck in the core shaft 20.

[0100] Among them, by setting the core shaft hole 21 as a cross hole, the two guide holes 15 set on the connecting arm 13 of the matching bracket 10 can meet the mirror installation under the condition of exactly the same parts, so as to adapt to the installation between different seats in the same row of the car.

[0101] Furthermore, the ends of the two linear segments 42 are fixedly connected by a rivet 43 , and the non-wrapped portion 421 of the linear segment 42 is bent to form a second folded end, which is used to connect with the lock buckle 60 .

[0102] The rivet buckle 43 has two insertion holes, and the ends of the two linear segments 42 are respectively inserted into the two insertion holes to increase the connection strength between the rivet buckle 43 and the ends of the two linear segments 42 .

[0103] The working principle of the present invention is as follows:

[0104] In the initial state, the core shaft 20 is rotatably arranged between the first vertical arm 12 and the second vertical arm 14 through the first opening 121 and the accommodating portion 141. The first flange portion 122 and the accommodating portion 141 of the bracket 10 can prevent the core shaft 20 from escaping from between the first vertical arm 12 and the second vertical arm 14, and the two ends of the torsion bar 30 are respectively engaged with the second opening 142 of the bracket 10 and the third opening 22 on the core shaft 20, and the core shaft 20 cannot rotate in the first opening 121 and the accommodating portion 141; the bottom of the rivet buckle 43 contacts the top surface of the connecting arm 13 of the bracket 10, and is used to support the rebound force of the connecting rope 40 wrapped around the core shaft 20. Due to the presence of the torsion bar 30 and the rivet buckle 43, the head of the lock buckle 60 can be maintained at the set position in the Z direction;

[0105] Force limiting process: When the vehicle collides, the occupant moves forward under the action of inertia, driving the lock and the connecting rope 40 to be pulled outward, which is transmitted to the core shaft 20 through the hook, causing the core shaft 20 to rotate, and driving the second part of the torsion bar 30 to twist relative to the first part, and the connecting rope 40 wrapped around the core shaft 20 is pulled out, thereby playing a force limiting role.

[0106] After the force limiting ends, the core shaft 20 rotates to the specified position. Due to the self-winding structure of the connecting rope 40, the first folded end 41 of the connecting rope 40 contacts the non-winding part 421 of the linear segment 42 of the connecting rope 40, making it impossible for the core shaft 20 to continue rotating. The lock buckle 60 remains in the current position to ensure that the occupant is not thrown away and causes secondary injury.

[0107] In this specification, references to the same or similar parts between the various embodiments can be made to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the product embodiments described later, since they correspond to the methods, the description is relatively simple, and the relevant parts can be referred to the partial description of the system embodiment.

[0108] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A force limiting device for a lock, comprising a bracket, a core shaft, a torsion bar, and a connecting rope; the bracket is fixed to a vehicle body component, the two ends of the core shaft are rotatably supported on the bracket, the torsion bar is coaxially arranged inside the core shaft, and the torsion bar includes a first portion fixed to the bracket and a second portion that can rotate synchronously with the core shaft, and the connecting rope is used to connect the lock and the core shaft, characterized in that: The core shaft is provided with a hook assembly; The connecting rope includes a first folded end and two linear segments extending from the first folded end, the first folded end is fixed to the hook assembly, and the two linear segments are wound around the outer circumference of the core shaft and then extend from the inside of the first folded end to be fixedly connected to the lock buckle; The hook assembly is a detachable separate component, comprising a limiting end and a fixed end, wherein the limiting end is used for limiting connection with the core shaft, and the fixed end is fixed to the first folded end; The core shaft is provided with a core shaft hole, the core shaft hole includes a long side greater than or equal to the length of the limiting end and a short side less than the length of the limiting end, and the limiting end is configured to be inserted into the core shaft from the long side and then slide to the short side to achieve locking; The hook assembly is formed by bending a linear integral piece, and includes a limiting width portion, a linear narrow portion, and a second flange portion arranged in sequence. The limiting width portion is formed with an opening. After the first folded end is placed on the linear narrow portion, the second flange portion is wrapped around the first folded end and then inserted into the opening. The limiting wide portion forms the limiting end, and the space surrounded by the linear narrow portion forms the fixed end; Among them, in the initial stage, the intersection of the non-winding part of the linear segment and the outer peripheral surface of the core shaft and the hook assembly have a preset distance in the winding direction of the winding part of the linear segment; in the force limiting stage, after the force applied to the lock reaches a preset threshold, it drives the core shaft and the second part of the torsion bar to rotate, so that the lock can move in the direction away from the core shaft; in the force limiting end stage, the first folded end rotates with the core shaft to the intersection of the non-winding part of the linear segment and the outer peripheral surface of the core shaft, and the lock stops moving.

2. The force limiting device according to claim 1, characterized in that: The core shaft hole is a cross hole, including the long side located in the middle and the two short sides located on both sides of the long side. The width of the limiting wide part matches the length of the long side, and the length of the linear narrow part matches the short side.

3. The force limiting device according to claim 1, characterized in that: The ends of the two linear segments are fixedly connected by rivets, and the non-wrapped portion of one linear segment is bent to form a second folded end, which is used to be connected to the lock buckle.

4. The force limiting device according to any one of claims 1 to 3, characterized in that: The bracket is an integral part, which includes a fixed arm, a first vertical arm, a connecting arm and a second vertical arm in sequence. The fixed arm is fixedly connected to the vehicle body component, and the core shaft is rotatably fixed between the first vertical arm and the second vertical arm. A guide hole is opened on the connecting arm, and the two linear segments extend from the guide hole and are fixedly connected to the lock.

5. The force limiting device according to claim 4, characterized in that: The first vertical arm is provided with a first opening and a first flange portion surrounding the first opening, and the second vertical arm is provided with a receiving portion matching the end of the core shaft; The core shaft axially passes through the first opening and abuts against the accommodating portion, and the first flanging portion is riveted to achieve rotatable fixation of the core shaft.

6. The force limiting device according to claim 5, characterized in that: The accommodating portion is provided with a second opening, and the end of the core shaft away from the accommodating portion is provided with a third opening. The torsion bar is a dumbbell-shaped structure, the first part is located at one end of the torsion bar and fixed in the second opening, and the second part is located at the other end of the torsion bar and fixed in the third opening.

7. The force limiting device according to claim 6, characterized in that: One end of the core shaft having the third opening is provided with a limiting step on the periphery of the third opening to form a pre-positioning step surface between the limiting step and the edge of the third opening.

8. The force limiting device according to claim 7, characterized in that: The second opening and the third opening are both polygonal holes, and the end of the first part and the end of the second part of the torsion bar are both configured as polygonal structures, and their outer peripheries are both provided with protrusions, so that the end of the first part of the torsion bar is interference fit with the second opening, and the end of the second part of the torsion bar is interference fit with the third opening.

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