Pre-tensioner housing, safety belt pre-tensioner assembly and vehicle

Abstract

The invention relates to the field of vehicle part manufacturing, in particular to a pretensioner housing, a safety belt pretensioner assembly and a vehicle, the pretensioner housing comprises an end cover and a protective sleeve, the end cover is used for being arranged on an end piece assembly of a pretensioner, and the protective sleeve is used for being arranged outside a tensioning piece of the pretensioner in a sleeving mode; a first connecting mechanism is arranged on the end cover, a second connecting mechanism matched with the first connecting mechanism is arranged at the position, facing the end cover, of the protective sleeve, and the end cover and the protective sleeve are detachably connected through the first connecting mechanism and the second connecting mechanism so that the end cover and the protective sleeve can be relatively fixed. Therefore, the protective sleeve cannot be loosened relative to the tensioning piece, the protection effect of the protective sleeve on the tensioning piece is guaranteed, the assembling stability of the protective sleeve relative to the end cover is guaranteed through the first connecting mechanism and the second connecting mechanism, and the use experience of a user is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicle component manufacturing, and in particular to a pretensioner cover, a seat belt pretensioner assembly and a vehicle. Background Art

[0002] At present, all vehicle seat belt mechanisms are equipped with pretensioners, which can tighten the seat belts to prevent passengers from slipping out of one side of the seat belt and getting hurt due to the seat belt being too loose when the vehicle collides. Seat belt pretensioners are usually composed of steel wire ropes, pistons, and end plates. Since part of the steel wire rope is exposed, a sheath is usually installed on the outside of the steel wire rope to improve the appearance and protect the steel wire rope to a certain extent.

[0003] In order to save installation time of the sheath, the current installation method is to directly put the sheath on the surface of the wire rope. However, the stability of this assembly is poor. After long-term use, the sheath becomes loose, which not only reduces the aesthetics, but also greatly reduces the protective effect of the wire rope, resulting in a significant decrease in the user experience. Summary of the invention

[0004] In order to solve the above technical problems, the present disclosure provides a pretensioner cover, a seat belt pretensioner assembly and a vehicle.

[0005] In a first aspect, the present disclosure provides a pretensioner housing, which includes an end cover and a sheath, wherein the end cover is used to be arranged on an end piece assembly of the pretensioner, and the sheath is used to be sleeved on the outside of a tensioning member of the pretensioner;

[0006] A first connecting mechanism is provided on the end cover, and a second connecting mechanism matching the first connecting mechanism is provided at a position of the sleeve facing the end cover. The end cover and the sleeve are detachably connected through the first connecting mechanism and the second connecting mechanism so that the end cover and the sleeve can be relatively fixed.

[0007] Optionally, one of the first connecting mechanism and the second connecting mechanism includes a transverse snap-in protrusion, and the other of the first connecting mechanism and the second connecting mechanism includes a transverse snap-in groove, and the end cover and the sleeve are snap-connected and fixed by the transverse snap-in protrusion passing through the transverse snap-in groove.

[0008] Optionally, at least one of the transverse clamping protrusions is provided with a stopper, the stopper is extended in a direction away from the transverse clamping protrusion, and the stopper can abut against the back side of the transverse clamping groove when the transverse clamping protrusion extends into the transverse clamping groove;

[0009] And / or, the transverse clamping protrusion is made of elastic material.

[0010] Optionally, one of the first connecting mechanism and the second connecting mechanism includes a longitudinal snap-in protrusion, and the other of the first connecting mechanism and the second connecting mechanism includes a longitudinal snap-in groove, and the end cover and the sleeve are snap-connected and fixed by the longitudinal snap-in protrusion passing through the longitudinal snap-in groove.

[0011] Optionally, a fixing cavity for setting the end piece assembly is formed inside the end cover, and a connecting hole connected to the fixing cavity is opened at a position of the end cover facing the sheath, and the sheath can be inserted into the connecting hole.

[0012] Optionally, the first connecting mechanism is arranged at an opening edge of the connecting hole, and the second connecting mechanism is arranged at a position of the sheath corresponding to the opening edge.

[0013] Optionally, the end cover includes a first cover body and a second cover body, and the first cover body and the second cover body together enclose the fixing cavity.

[0014] Optionally, the first cover body includes a cover plate and a connecting ring arranged on one side of the cover plate, and the cover plate, the connecting ring and the second cover body together enclose the fixing cavity;

[0015] The connecting ring has a connecting hole communicating with the fixing cavity.

[0016] Optionally, a limiting assembly for connecting an end piece assembly is provided on at least one of the first cover body and the second cover body.

[0017] Optionally, the limiting assembly includes a first limiting member and a second limiting member, the first limiting member and the second limiting member are arranged opposite to each other and together form a limiting space for installing the end piece assembly.

[0018] Optionally, the limiting space is formed between the first limiting member and the second limiting member, and the end piece assembly is clamped in the limiting space by the first limiting member and the second limiting member;

[0019] And / or, the first limiting member also includes a first limiting groove, the second limiting member also includes a second limiting groove opposite to the first limiting groove, and the end piece assembly has two mounting parts, and the two mounting parts can respectively extend into the first limiting groove and the second limiting groove to fix the end piece assembly in the limiting space.

[0020] Optionally, the pretensioner cover further comprises a first positioning member and a second positioning member, one of the first positioning member and the second positioning member is arranged on the end cover, the other of the first positioning member and the second positioning member is arranged at a position of the sleeve facing the end cover, and the first positioning member can be connected to the second positioning member, so that the end cover and the sleeve can be connected to each other through the first positioning member and the second positioning member;

[0021] And / or, the sheath is a flexible corrugated tube;

[0022] And / or, the tensioning member is a steel wire rope.

[0023] In a second aspect, the present disclosure further provides a seat belt pretensioner assembly, which includes a pretensioner body and the pretensioner cover as described above.

[0024] Optionally, the pretensioner body comprises a tensioner and an end piece assembly, the end piece assembly comprises an upper end piece and a lower end piece, and the lower end piece is connected to the tensioner rope;

[0025] The upper end piece is provided with a first connection hole, the lower end piece is provided with a second connection hole, and the upper end piece and the lower end piece are connected to each other by fasteners which penetrate through the first connection hole and the second connection hole.

[0026] In a third aspect, the present disclosure further provides a vehicle, which includes the pretensioner housing as described above, or includes the seat belt pretensioner assembly as described above.

[0027] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0028] The pretensioner cover, seat belt pretensioner assembly and vehicle provided by the embodiments of the present disclosure are such that the pretensioner cover includes an end cover and a sleeve. The end cover is used to be arranged on the end piece assembly of the pretensioner. Since the end piece assembly is connected to the tensioning member, the end cover can be fixed in position relative to the tensioning member. On this basis, the end cover is provided with a first connecting mechanism, and the sleeve mounted on the outside of the tensioning member is provided with a second connecting mechanism. The end cover and the sleeve can be detachably connected through the first connecting mechanism and the second connecting mechanism, so that the sleeve and the end cover can be relatively fixed, thereby realizing the fixation of the sleeve relative to the tensioning member, and the sleeve will not loosen relative to the tensioning member. Not only the protective effect of the sleeve on the tensioning member is guaranteed, but also the assembly stability of the sleeve relative to the end cover is guaranteed through the first connecting mechanism and the second connecting mechanism, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0031] Figure 1 It is a structural schematic diagram of the pretensioner cover according to an embodiment of the present disclosure;

[0032] Figure 2 It is a structural explosion diagram of the pretensioner cover according to the embodiment of the present disclosure;

[0033] Figure 3 It is a structural schematic diagram of the first cover body of the pretensioner cover according to the embodiment of the present disclosure;

[0034] Figure 4 It is a schematic structural diagram of a sheath of a pretensioner cover according to an embodiment of the present disclosure;

[0035] Figure 5 It is a cross-sectional schematic diagram of the connection between the end cover and the sleeve of the pretensioner cover according to the embodiment of the present disclosure;

[0036] Figure 6 A schematic structural diagram of the first cover of the pretensioner housing according to an embodiment of the present disclosure from another perspective;

[0037] Figure 7 It is a schematic diagram of the connection between the first cover body and the lower end piece of the pretensioner cover according to the embodiment of the present disclosure;

[0038] Figure 8 It is a schematic diagram of the connection between the first cover body and the upper end piece of the pretensioner cover according to the embodiment of the present disclosure;

[0039] Fig. 9 It is a structural schematic diagram of a seat belt pretensioner assembly according to an embodiment of the present disclosure;

[0040] Fig.10 It is a structural explosion diagram of the seat belt pretensioner assembly described in an embodiment of the present disclosure.

[0041] Reference numerals:

[0042] 1. Pretensioner cover; 11. End cover; 111. Horizontal snap-fit ​​protrusion; 112. Stopper; 113. Longitudinal snap-fit ​​protrusion; 114. First cover body; 1141. Cover plate; 1142. Connecting ring; 115. Second cover body; 12. Sheath; 121. Horizontal snap-fit ​​groove; 122. Longitudinal snap-fit ​​groove; 13. Positioning assembly; 131. First positioning member; 132. Second positioning member; 14. Limiting assembly; 141a. Limiting beam; 141b. Limiting block; 142a. First limiting groove; 142b. Second limiting groove; 2. End piece assembly; 21. Upper end piece; 22. Lower end piece; 3. Tensioner; 4. Fastener. DETAILED DESCRIPTION

[0043] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0045] Embodiment 1

[0046] like Figure 1-10 As shown, this embodiment provides a pretensioner housing 1, which includes an end cover 11 and a sheath 12, the end cover 11 is used to be arranged on the end piece assembly 2 of the pretensioner, and the sheath 12 is used to be sleeved on the outside of the tensioning member 3 of the pretensioner.

[0047] Exemplarily, the pretensioner generally includes an end piece assembly 2, a tensioner 3, a piston, a gas generator, etc. The end piece assembly 2 has a mounting hole for inserting the seat belt webbing, and the end piece assembly 2 is connected to the piston through the tensioner 3. When the vehicle collides, the sensor in the vehicle triggers a signal to the gas generator, and the gas generator explodes. The generated high-pressure gas pushes the piston rod and the piston rod guide head to move, and the tensioner 3 pulls the end piece assembly 2 to achieve locking, and quickly retracts the seat belt webbing, preventing the seat belt at the waist position of the occupant from sliding to the shoulder position, pulling the occupant back, and reducing the displacement of the occupant's waist to reduce the chest compression, thereby eliminating the gap between the occupant and the seat, achieving the purpose of pretensioning, and reducing occupant injuries, and ensuring the protective effect of the seat belt.

[0048] The end cap 11 is arranged on the end piece assembly 2 of the pretensioner, and can be installed on the end piece assembly 2, and can enclose and cover at least part of the end piece assembly 2 (such as the connection part between the end piece assembly 2 and the tensioning member 3), and at the same time play the effect of improving the aesthetics. The sheath 12 is sleeved on the outside of the tensioning member 3 of the pretensioner, and specifically wraps the tensioning member 3 so that it will not be exposed. Specifically, the sheath 12 may not have a connection relationship with the tensioning member 3, and it can be kept fixed relative to the end cap 11.

[0049] Among them, a first connecting mechanism is arranged on the end cover 11, and a second connecting mechanism matching the first connecting mechanism is arranged at a position of the sleeve 12 facing the end cover 11. The end cover 11 and the sleeve 12 are detachably connected through the first connecting mechanism and the second connecting mechanism so that the end cover 11 and the sleeve 12 can be relatively fixed.

[0050] Since the tensioning member 3 of the existing seat belt warning device is exposed, the appearance is poor. In order to improve the appearance of the lap pretensioner, a lap pretensioner sheath 12 is added outside the tensioning member 3 of the lap pretensioner. However, the current lap pretensioner sheath 12 is mostly a separate structure from the pretensioner, which not only has poor assembly consistency, but also easily causes the problem of wrong or missing assembly due to unreliable assembly. Moreover, after long-term and durable use, the sheath 12 may become loose, causing after-sales complaints.

[0051] In specific implementation, the sheath 12 can be firstly sleeved on the outside of the tensioning member 3 of the pretensioner to keep it in a free state and slide along the tensioning member 3, and then the end cover 11 and the end piece assembly 2 of the pretensioner are connected to fix the end cover 11 relative to the end piece assembly 2 of the pretensioner. After the end cover 11 and the end piece assembly 2 of the pretensioner are relatively fixed, the sheath 12 is moved toward the position of the end cover 11, so that the first connecting mechanism and the second connecting mechanism are close to each other until the first connecting mechanism and the second connecting mechanism are connected to each other, so that the end cover 11 and the sheath 12 are connected and fixed to each other through the first connecting mechanism and the second clamping structure. Since the connection and fixation between the end piece assembly 2 and the tensioning member 3 are reliable, the installation and fixation of the sheath 12 relative to the end cover 11 is ensured by connecting the sheath 12 to the end cover 11 set on the end piece assembly 2, and the sheath 12 will not slip relative to the end piece assembly 2, and thus will not slip relative to the tensioning member 3. When the sheath 12 needs to be separated from the end cover 11, the first connecting mechanism and the second clamping structure are released from the connection state.

[0052] The pretensioner cover 1 provided in this embodiment includes an end cover 11 and a sheath 12. The end cover 11 is used to be arranged on the end piece assembly 2 of the pretensioner. Since the end piece assembly 2 is connected to the tensioning member 3, the end cover 11 can be fixed in position relative to the tensioning member 3. On this basis, the end cover 11 has a first connecting mechanism, and the sheath 12 sleeved on the outside of the tensioning member 3 has a second connecting mechanism. The end cover 11 and the sheath 12 can be detachably connected through the first connecting mechanism and the second connecting mechanism, so that the sheath 12 and the end cover 11 can be relatively fixed, thereby achieving the fixation of the sheath relative to the tensioning member 3, and the sheath 12 will not loosen relative to the tensioning member 3, thereby ensuring the protection effect of the sheath 12 on the tensioning member 3, while ensuring the aesthetics of the pretensioner and improving the user experience.

[0053] For example, the end cap 11 and the sheath 12 can both be supported by plastic materials to reduce the weight of the structure and facilitate processing. The tensioning member 3 can be, for example, a steel wire rope. Of course, in other embodiments, the pretensioner cover can also be used on tensioning members 3 made of other materials other than steel wire ropes.

[0054] Reference Figure 4 As shown, in one practicable manner, the sheath 12 may be a flexible bellows, which has strong deformability and better flexible protection effect on the tensioning member 3, and the length of the bellows is adjustable within a certain range, so it has a wide range of applicability and strong applicability.

[0055] In some embodiments, a fixing cavity for setting the end piece assembly 2 is formed inside the end cover 11, and a connecting hole connected to the fixing cavity is opened at a position of the end cover 11 facing the sheath 12, and the sheath 12 can be inserted into the connecting hole.

[0056] The fixing cavity is used to accommodate the end piece assembly 2, that is, at least part of the end piece assembly 2 can be located inside the end cover 11, that is, in the fixing cavity, so that the end piece assembly 2 is protected to a certain extent by the end cover 11. In specific implementation, since the end piece assembly 2 needs to be connected to the seat belt webbing, the part of the end piece assembly 2 provided with the mounting hole must be exposed to ensure the installation connection between the end piece assembly 2 and the seat belt webbing.

[0057] Exemplarily, the sleeve 12 and the connecting hole may be provided with an interference fit, so that the degree of fastening between the sleeve 12 and the end cover 11 can be further improved through the clamping force between the sleeve 12 and the connecting hole, thereby further ensuring the connection effect.

[0058] Reference Figure 5As shown, in some embodiments, the first connection mechanism is arranged at the opening edge of the connection hole, and the second connection mechanism is arranged at the position of the corresponding opening edge of the sheath 12. Since the sheath 12 penetrates into the end cover 11 through the connection hole, the first connection mechanism and the second connection mechanism are arranged correspondingly at the position of the connection hole, which can further ensure the connection reliability and connection tightness between the sheath 12 and the end cover 11.

[0059] Reference Figure 5 As shown, in some embodiments, one of the first connecting mechanism and the second connecting mechanism includes a transverse snap-in protrusion 111, and the other of the first connecting mechanism and the second connecting mechanism includes a transverse snap-in groove 121, and the end cover 11 and the sleeve 12 are snap-fitted and fixed by the transverse snap-in protrusion 111 penetrating into the transverse snap-in groove 121.

[0060] Exemplarily, in this embodiment, the first connecting mechanism provided on the end cover 11 includes a transverse snap-in protrusion 111, and the second connecting mechanism provided on the sleeve 12 ensures a transverse snap-in groove 121. The transverse snap-in protrusion 111 on the end cover 11 can extend into the transverse snap-in groove 121 on the sleeve 12, thereby achieving relative fixation between the end cover 11 and the sleeve 12.

[0061] Reference Figure 5 As shown, in a specific implementation, the number of transverse snap-fit ​​protrusions 111 and transverse snap-fit ​​grooves 121 can be set to multiple, and all the transverse snap-fit ​​protrusions 111 are arranged at intervals along the circumference of the end cover 11, and correspondingly, multiple transverse snap-fit ​​grooves 121 are arranged at intervals along the circumference of the sleeve 12. Such an arrangement can further enhance the connection effect between the end cover 11 and the sleeve 12, and ensure the relative fixation of the sleeve 12 and the end cover 11 in all directions along the circumference.

[0062] Exemplarily, when the transverse snap-fitting protrusion 111 and the transverse snap-fitting groove 121 are provided, the transverse snap-fitting protrusion 111 can extend from the opening edge of the connecting hole toward the center of the connecting hole, thereby ensuring a better fixing effect between the transverse snap-fitting protrusion 111 and the transverse snap-fitting groove 121 .

[0063] Reference Figure 5As shown, in some embodiments, at least one transverse clamping protrusion 111 is further provided with a stopper 112, and the stopper 112 is extended in a direction away from the transverse clamping protrusion 111, and the stopper 112 can abut against a side of the transverse clamping groove 121 that faces away from the end cover 11 when the transverse clamping protrusion 111 extends into the transverse clamping groove 121. In this way, after the transverse clamping protrusion 111 extends into the transverse clamping groove 121, the stopper 112 abuts against a side of the opening edge of the transverse clamping groove 121 that faces away from the connection hole, thereby further preventing the transverse clamping protrusion 111 from falling out of the shared clamping groove, thereby further ensuring the connection reliability between the transverse clamping protrusion 111 and the transverse clamping groove 121.

[0064] Exemplarily, the stop portion 112 can be a stop protrusion extending from one side of the transverse clamping protrusion 111. When the transverse clamping protrusion 111 extends into the transverse clamping groove 121, the stop portion 112 can abut against one side of the transverse clamping groove 121, so that the transverse clamping protrusion 111 is located in the transverse clamping groove 121 and will not fall out due to the abutment of the stop portion 112.

[0065] In some embodiments, the transverse clamping protrusion 111 is made of elastic material. In this way, when the transverse clamping protrusion 111 extends into the transverse clamping groove 121, it can deform to a certain extent to facilitate the passage of the stopper 112, and the part of the stopper 112 that extends into the transverse clamping groove 121 restores its original shape so that the stopper 112 abuts against one side of the transverse clamping groove 121.

[0066] Of course, in other embodiments, other methods may also be used to achieve the abutment between the stop portion 112 and the transverse snap-in groove 121, such as making the transverse snap-in protrusion 111 tilt along the groove relative to the transverse snap-in groove 121, so that the stop portion 112 moves toward one side of the transverse snap-in groove 121 after entering the transverse snap-in groove 121 until it can abut against one side of the transverse snap-in groove 121.

[0067] See also Figure 7 As shown, in some embodiments, one of the first connecting mechanism and the second connecting mechanism also includes a longitudinal snap-in protrusion 113, and the other of the first connecting mechanism and the second connecting mechanism also includes a longitudinal snap-in groove 122, and the end cover 11 and the sleeve 12 are snap-fitted and fixed by the longitudinal snap-in protrusion 113 passing through the longitudinal snap-in groove 122.

[0068] Such an arrangement enables the end cover 11 and the sleeve 12 to be relatively fixed not only through the transverse snap-fit ​​protrusion 111 and the transverse snap-fit ​​groove 121, but also to be relatively fixed in another direction through the longitudinal snap-fit ​​protrusion 113 and the longitudinal snap-fit ​​groove 122, thereby further ensuring the matching reliability between the end cover 11 and the sleeve 12 and further preventing the two from loosening.

[0069] Exemplarily, the cooperation between the transverse snap-fit ​​groove 121 and the transverse snap-fit ​​protrusion 111 can be specifically that the transverse snap-fit ​​protrusion 111 extends into the transverse snap-fit ​​groove 121 along the transverse direction to achieve relative fixation. The cooperation between the longitudinal snap-fit ​​groove 122 and the longitudinal snap-fit ​​protrusion 113 can be specifically that the longitudinal snap-fit ​​protrusion 113 extends into the longitudinal snap-fit ​​groove 122 along the longitudinal direction to achieve relative fixation. The "transverse direction" in this embodiment specifically refers to the direction perpendicular to the extension direction of the tension member 3, that is, the direction in which the cross-sections of the sheath 12 and the end cover 11 are located. Correspondingly, the "longitudinal direction" in this embodiment specifically refers to the extension direction of the tension member 3, and can also be understood as the vertical direction of the tension member 3.

[0070] See also Figure 2 As shown, in some embodiments, the end cap 11 includes a first cover body 114 and a second cover body 115, and the first cover body 114 and the second cover body 115 together enclose a fixed cavity. This arrangement facilitates the assembly of the end cap 11 and the end piece assembly 2, and also facilitates the casting of the structure.

[0071] Exemplarily, in some embodiments, the first cover body 114 includes a cover plate 1141 and a connecting ring 1142 arranged on one side of the cover plate 1141. The cover plate 1141, the connecting ring 1142 and the second cover body 115 together form a fixed cavity, and a connecting hole connected to the fixed cavity is formed on the connecting ring 1142.

[0072] The cover plate 1141 and the second cover body 115 can be fixed by snapping or by connecting bolts. The connecting ring 1142 and the cover plate 1141 can be an integrally formed structure to ensure structural strength. In specific implementation, the connecting ring 1142 is arranged at one end of the cover plate 1141 facing the sheath 12, so as to facilitate matching and connection with the sheath 12.

[0073] See also Figure 5 As shown, in some embodiments, the pretensioner cover 1 further includes a positioning assembly 13, the positioning assembly 13 includes a first positioning member 131 and a second positioning member 132 which can be connected to each other, one of the first positioning member 131 and the second positioning member 132 is arranged on the end cover 11, and the other of the first positioning member 131 and the second positioning member 132 is arranged at a position of the sleeve 12 facing the end cover 11.

[0074] The positioning component 13 is used to realize positioning or pre-positioning when connecting the sleeve 12 and the end cover 11. In this embodiment, the positioning component 13 can adopt a structure similar to a clamping protrusion and a clamping groove, that is, the first positioning member 131 can be a positioning protrusion arranged at the edge of the opening of the connecting hole, and the second positioning member 132 can be a positioning groove arranged at the position of the sleeve 12 corresponding to the positioning protrusion. When the sleeve 12 and the end cover 11 are assembled, the positioning protrusion can extend into the positioning groove.

[0075] In addition, in some embodiments, the positioning protrusions and the first connecting mechanism can be arranged in a staggered manner along the circumference of the connecting hole. This not only achieves a better connection matching effect, but also can realize a fool-proof design through the specific positions of the positioning component 13 and the snap-fit ​​mechanism component, thereby facilitating the installer to perform correct alignment installation, especially when the sleeve 12 has an asymmetric structural design, which makes it more convenient to connect and fix the sleeve 12 to the end cover 11.

[0076] See also Figure 6 As shown, in some embodiments, at least one of the first cover 114 and the second cover 115 is further provided with a stopper assembly 14 for connecting the end piece assembly 2. The stopper assembly 14 is used to connect and fix the end cover 11 with the end piece assembly 2 to achieve positioning of the pretensioner housing 1 as a whole.

[0077] Exemplarily, the limiting assembly 14 includes a first limiting member and a second limiting member, which are arranged opposite to each other and together form a limiting space for installing the end piece assembly 2. In other words, a space matching the end piece assembly 2 can be formed between the first limiting member and the second limiting member, and when the end piece assembly 2 is located in the limiting space, the end piece assembly 2 is fixed relative to the end cover 11.

[0078] In some embodiments, a limiting space is formed between the first limiting member and the second limiting member, and the end piece assembly 2 is clamped in the limiting space by the first limiting member and the second limiting member. In specific implementation, the first limiting member can be a limiting beam 141a, and the second limiting member can be a limiting block 141b located on one side of the limiting beam 141a, and the limiting beam 141a has a avoidance groove at a position corresponding to the limiting block 141b for part of the connecting tensioning member 3 of the end piece assembly 2 to extend into, and the end piece assembly 2 is clamped in the limiting space formed between the limiting beam 1411a and the limiting block 141b, that is, the limiting beam 141a and the limiting block 141b clamp the end piece assembly 2 together, so that it is located in the limiting space and will not fall out.

[0079] In some embodiments, a first limiting member may have a first limiting groove 142a, a second limiting member may have a second limiting groove 142b opposite to the first limiting groove 142a, and the end piece assembly 2 may have two mounting portions, which extend into the first limiting groove 142a and the second limiting groove 142b respectively.

[0080] It should be noted that, no matter whether it is a limiting space or a limiting groove, it can be formed by one of the first cover body 114 and the second cover body 115, or it can be formed by the first cover body 114 and the second cover body 115 together. In addition, for the end cover 11, multiple groups of limiting components 14 can be arranged in the accommodating cavity to limit the end piece component 2 in different directions.

[0081] See also Fig. 9 and Fig.10 As shown, with respect to the above-mentioned pretensioner cover 1 , this embodiment further provides a seat belt pretensioner assembly, which includes a pretensioner body and the above-mentioned pretensioner cover 1 .

[0082] The pretensioner body includes an end piece assembly 2, a tensioning member 3, a piston, a gas generating device and other structures. The end cover 11 is arranged on the end piece assembly 2 of the pretensioner, and the sheath 12 is sleeved on the outside of the tensioning member 3 of the pretensioner. The end piece assembly 2 is an assembly connected to the tensioning member 3, which can be composed of a metal structure and a plastic structure to achieve a lightweight structure while ensuring strength.

[0083] In some embodiments, the end piece assembly 2 includes an upper end piece 21 and a lower end piece 22, and the lower end piece 22 is connected to the tensioning member 3. A first connection hole is provided on the upper end piece 21, and a second connection hole is provided on the lower end piece 22. The upper end piece 21 and the lower end piece 22 are connected to each other through a fastener 4 that is inserted through the first connection hole and the second connection hole.

[0084] In a specific implementation, the lower end piece 22 is used to be connected and fixed with the end cover 11. At the same time, corresponding mounting holes are opened on the lower end piece 22, the upper end piece 21 and the end cover 11, and the fasteners 4 are jointly penetrated through the mounting holes on the three structures to achieve mutual fixation between the lower end piece 22, the upper end piece 21 and the end cover 11.

[0085] Embodiment 2

[0086] This embodiment provides a vehicle, which includes the seat belt pretensioner assembly provided in the first embodiment, and a pretensioner cover provided on the seat belt pretensioner assembly.

[0087] The seat belt pretensioner assembly includes a pretensioner body and the above-mentioned pretensioner cover. The pretensioner body includes an end plate assembly, a tensioner, a piston, a gas generating device and other structures. The end cover is arranged on the end plate assembly of the pretensioner, and the sheath is arranged outside the tensioner of the pretensioner.

[0088] When the vehicle collides, the sensor in the vehicle will trigger a signal to the gas generating device, which will explode. The generated high-pressure gas will push the piston rod and the piston rod guide head to move, and the tensioning member will pull the end plate assembly to achieve locking, while quickly retracting the seat belt webbing to prevent the seat belt at the occupant's waist position from sliding toward the shoulder position, pulling the occupant back and reducing the occupant's waist displacement to reduce the chest compression, thereby eliminating the gap between the occupant and the seat, achieving the purpose of pre-tightening and reducing occupant injuries, and ensuring the protective effect of the seat belt.

[0089] Since the tensioning parts of existing seat belt warning devices are exposed, resulting in poor appearance, in order to improve the appearance of the lap pretensioner, a lap pretensioner sleeve is added outside the tensioning parts of the lap pretensioner. However, the current lap pretensioner sleeves are mostly separate structures from the pretensioner, which not only has poor assembly consistency and is prone to wrong or missing installation problems, but also after long-term use, the sleeves may become loose, causing after-sales complaints.

[0090] The pretensioner cover provided in this embodiment includes an end cover and a sleeve, wherein the end cover is used to be arranged on the end piece assembly of the pretensioner, and the end piece assembly is connected to the tensioning member, so that the end cover is fixed in position relative to the tensioning member, and on this basis, the end cover is provided with a first connecting mechanism, and the sleeve arranged on the outside of the tensioning member is provided with a second connecting mechanism, and the end cover and the sleeve can be mutually clamped and fixed by the first connecting mechanism and the second connecting mechanism, so that the sleeve is fixed relative to the tensioning member, and the sleeve will not loosen relative to the tensioning member, thereby ensuring the protective effect of the sleeve on the tensioning member, while ensuring the aesthetics of the pretensioner and improving the user experience.

[0091] Exemplarily, when the seat belt pretensioner assembly is fixed to a seat or a vehicle body, it can be connected and fixed with a fixing bolt through the mounting fixing hole on the bracket of the seat belt pretensioner assembly and the corresponding mounting fixing hole on the seat or the vehicle body.

[0092] In addition, other configuration methods of the seat belt pretensioner assembly and pretensioner cover of the vehicle of this embodiment are the same as those of the seat belt pretensioner assembly and pretensioner cover provided in Example 1, and can bring the same or similar technical effects, so they will not be described one by one here, and please refer to the description of Example 1 for details.

[0093] The vehicle provided in this embodiment can be a passenger car or a commercial vehicle, etc., and this embodiment is not limited thereto. Any vehicle that can be equipped with the seat belt pretensioner assembly and pretensioner cover provided in the first embodiment falls within the protection scope of this embodiment.

[0094] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0095] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pretensioner cover, characterized in that: It comprises an end cover and a sheath, wherein the end cover is used to be arranged on the end piece assembly of the pretensioner, and the sheath is used to be sleeved on the outside of the tensioning member of the pretensioner; A first connecting mechanism is provided on the end cover, and a second connecting mechanism matching the first connecting mechanism is provided at a position of the sleeve facing the end cover. The end cover and the sleeve are detachably connected through the first connecting mechanism and the second connecting mechanism so that the end cover and the sleeve can be relatively fixed.

2. The pretensioner cover according to claim 1, characterized in that: One of the first connection mechanism and the second connection mechanism includes a transverse snap-in protrusion, and the other of the first connection mechanism and the second connection mechanism includes a transverse snap-in groove, and the end cover and the sleeve are snap-connected and fixed by the transverse snap-in protrusion penetrating into the transverse snap-in groove.

3. The pretensioner cover according to claim 2, characterized in that: A stopper is provided on at least one of the transverse clamping protrusions, the stopper extending in a direction away from the transverse clamping protrusion, and the stopper can abut against the back side of the transverse clamping groove when the transverse clamping protrusion extends into the transverse clamping groove; And / or, the transverse clamping protrusion is made of elastic material.

4. The pretensioner cover according to claim 1, characterized in that: One of the first connecting mechanism and the second connecting mechanism includes a longitudinal snap-in protrusion, and the other of the first connecting mechanism and the second connecting mechanism includes a longitudinal snap-in groove, and the end cover and the sleeve are snap-connected and fixed by the longitudinal snap-in protrusion penetrating into the longitudinal snap-in groove.

5. The pretensioner cover according to any one of claims 1 to 4, characterized in that: A fixing cavity for setting the end piece assembly is formed inside the end cover, and a connecting hole connected to the fixing cavity is opened at a position of the end cover facing the sheath, and the sheath can be inserted into the connecting hole.

6. The pretensioner cover according to claim 5, characterized in that: The first connection mechanism is arranged at an opening edge of the connection hole, and the second connection mechanism is arranged at a position of the sheath corresponding to the opening edge.

7. The pretensioner cover according to claim 5, characterized in that: The end cover comprises a first cover body and a second cover body, and the first cover body and the second cover body are jointly enclosed to form the fixing cavity.

8. The pretensioner cover according to claim 7, characterized in that: The first cover body comprises a cover plate and a connecting ring arranged on one side of the cover plate, and the cover plate, the connecting ring and the second cover body together enclose the fixing cavity; The connecting ring has a connecting hole communicating with the fixing cavity.

9. The pretensioner cover according to claim 7, characterized in that: A limiting assembly for installing the end piece assembly is disposed on at least one of the first cover body and the second cover body.

10. The pretensioner cover according to claim 9, characterized in that: The limiting assembly includes a first limiting member and a second limiting member, wherein the first limiting member and the second limiting member are arranged opposite to each other and together form a limiting space for installing the end piece assembly.

11. The pretensioner cover according to claim 10, characterized in that: The limiting space is formed between the first limiting member and the second limiting member, and the end piece assembly is clamped in the limiting space by the first limiting member and the second limiting member; And / or, the first limiting member also includes a first limiting groove, the second limiting member also includes a second limiting groove opposite to the first limiting groove, and the end piece assembly has two mounting parts, and the two mounting parts can respectively extend into the first limiting groove and the second limiting groove to fix the end piece assembly in the limiting space.

12. The pretensioner cover according to any one of claims 1 to 4, characterized in that: The pretensioner housing further comprises a first positioning member and a second positioning member, one of the first positioning member and the second positioning member is disposed on the end cover, the other of the first positioning member and the second positioning member is disposed at a position of the sleeve facing the end cover, and the first positioning member can be connected to the second positioning member, so that the end cover and the sleeve can be connected to each other through the first positioning member and the second positioning member; And / or, the sheath is a flexible corrugated tube; And / or, the tensioning member is a steel wire rope.

13. A seat belt pretensioner assembly, characterized in that: The invention comprises a pretensioner body and a pretensioner cover according to any one of claims 1 to 12.

14. The seat belt pretensioner assembly according to claim 13, characterized in that: The pretensioner body comprises a tensioning member and the end piece assembly, the end piece assembly comprises an upper end piece and a lower end piece, and the lower end piece is connected to the tensioning member; The upper end piece is provided with a first connection hole, the lower end piece is provided with a second connection hole, and the upper end piece and the lower end piece are connected to each other by fasteners which penetrate through the first connection hole and the second connection hole.

15. A vehicle, characterized in that: The invention comprises a pretensioner housing as claimed in any one of claims 1 to 12, or comprises a seat belt pretensioner assembly as claimed in claim 13 or 14.

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