Locking device of vehicle safety belt

Abstract

The locking device of the vehicle safety belt comprises a base plate connected with the safety belt, a lock head fixed to a vehicle body through a cable and a shell, the lock head comprises a columnar shaft body and a blocking edge, and the base plate is provided with a first notch used for containing the lock head. A left side part, a right side part, a front end part and a rear end part are respectively formed on the substrate along the circumferential direction of the first notch, a supporting part and a positioning flange which are formed by extending towards the interior of the first notch are respectively arranged on the left side part and the right side part, and a limiting part is formed on the rear end part close to the opening; the lock head can move to a locking state from a mounting state in the first notch, and the locking state is configured to be that the limiting part abuts against the axial end face of the lock head, the supporting part abuts against the first side of the flange, and the positioning flange abuts against the second side of the flange. The waist pre-tensioner and the safety belt retractor system can be independently installed and fixed on a vehicle body or a seat rigid structure, and then the whole safety belt system is formed by connecting the waist pre-tensioner and the safety belt retractor system through the locking device.

Description

Technical Field

[0001] This specification relates to the field of vehicle safety technology, specifically to a locking device for a vehicle seatbelt. Background Technology

[0002] The current seatbelt assembly process generally follows this procedure: one end of the seatbelt is fixed inside the retractor spool of the vehicle, and the other end is fixed to the vehicle's rigid structure or to the lumbar pretensioner connecting guide ring via a fixing end piece. For the latter, the lumbar pretensioner is typically connected to the other end of the seatbelt first, and then fixed to the vehicle's rigid structure or the rigid frame of the vehicle seat to form the entire seatbelt system. In this case, the lumbar pretensioner needs to be manufactured and shipped as a whole to the vehicle manufacturer along with the seatbelt retractor system. For the vehicle manufacturer, this overall structure is not conducive to operator installation, especially in confined spaces within the vehicle body, where space limitations make installation difficult. Summary of the Invention

[0003] In view of this, the embodiments of this specification provide a locking device for a vehicle seat belt, which can first install and fix the lumbar pretensioner and seat belt retractor system independently to the rigid structure of the vehicle body or seat, and then connect them through the locking device to form the entire seat belt system.

[0004] This specification provides the following technical solution through its embodiments: a locking device for a vehicle seatbelt, comprising a base plate connected to the seatbelt, a lock head fixed to the vehicle body via a cable, and a housing, wherein the housing is used to accommodate the base plate and / or the lock head, and has an opening for the cable to pass through.

[0005] The lock head includes a cylindrical shaft and two symmetrically arranged side flanges extending axially along the cylindrical shaft. The base plate has a first notch for placing the lock head. The base plate along the circumference of the first notch forms a left side portion, a right side portion, a front end portion, and a rear end portion. The left side portion and the right side portion are respectively provided with a support portion and a positioning flange extending into the first notch. The rear end portion near the opening forms a limiting portion for accommodating the cable.

[0006] The lock head can be moved within the first notch from an installed state near the front end to a locked state near the rear end. The locked state is configured such that the limiting portion abuts against the axial end face of the lock head to restrict the lock head from moving away from the front end, the supporting portion abuts against the first side of the stop, and the positioning flange abuts against the second side opposite to the first side of the stop to restrict the lock head from rotating within the first notch.

[0007] Preferably, the substrate has a reference plane, the positioning flange extends into the first notch on the reference plane, the support portion and the limiting portion both extend to one side of the reference plane, the positioning flange is located between the support portion and the limiting portion, the installation state is configured such that the first side of the retaining edge abuts against the support portion and the second side is placed on one side of the reference plane, and the cable is placed in the limiting portion.

[0008] Preferably, the two side flanges are located on the same radial plane and have the same width, and when the lock head is in the installed state or the locked state, the radial plane is parallel to the reference plane.

[0009] Preferably, the distance between the ends of the support portions on both sides and the distance between the ends of the positioning flanges on both sides are both greater than the width of the columnar shaft and less than the distance between the ends of the side guards on both sides.

[0010] Preferably, one of the flanges has an installation error prevention notch, and a step portion corresponding to the installation error prevention notch is formed in the first notch, so that the lock head can only be installed in the first notch in a specific direction and in the installation state.

[0011] Preferably, the housing includes an upper end cover, a side end cover, and a base. The upper end cover and the side end cover are both connected to the base via hinges. After the upper end cover engages with the base, it accommodates the front end of the substrate. After the side end cover engages with the base, it accommodates the remaining part of the substrate and / or the lock head. The front end is provided with a first opening for a seat belt to pass through and be fixed. The upper end cover and the base are respectively provided with a second opening and a third opening corresponding to the first opening.

[0012] Preferably, the side end cover is provided with a locking block, which is configured such that during the installation of the lock head, only when the lock head is in the locked state, the locking block can be inserted into the first notch and the side end cover can be engaged and fixed with the base. The locking block can abut against the axial end face of the lock head to restrict the lock head from moving towards the front end.

[0013] Preferably, the cable is a steel wire rope, and the columnar shaft has a through hole along its axial direction for connecting with the steel wire rope. The steel wire rope is connected to the columnar shaft by press riveting and a groove is formed on its surface. The base is provided with a limiting protrusion, which engages with the groove only when the lock head is in the locked state.

[0014] Preferably, the limiting protrusion includes a vertical arm perpendicular to the base plane and a wedge-shaped rib connecting the vertical arm and the base plane respectively. Along the direction close to the front end, the distance between the inclined surface of the wedge-shaped rib and the base gradually decreases. When the lock head is in the locked state, the vertical arm is at least partially embedded in the groove, and the vertical arm abuts against the inner wall of the groove to restrict the lock head from moving towards the direction close to the front end.

[0015] Preferably, a double-sided flange structure is formed at the edge of the first opening, and the double-sided flange structure protrudes from the second opening and the third opening respectively.

[0016] Compared with the prior art, the beneficial effects that at least one technical solution adopted in the embodiments of this specification can achieve include at least:

[0017] By designing a new locking device, the lumbar pretensioner and seat belt retractor system can be independently installed and fixed to the rigid structure of the vehicle body or seat. Then, they can be connected by the locking device to form the entire seat belt system. The lock head can move from the installed state to the locked state within the first notch on the base plate. When the lock head is in the locked state, the support part and the positioning flange formed in the first notch are respectively distributed on the opposite sides of the lock head stop, which can limit the rotational displacement of the lock head within the first notch. The limiting part is located on the side of the lock head away from the front end, thereby limiting the movement of the lock head away from the front end, which can effectively prevent the risk of accidental separation during a collision. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is an exploded structural diagram of the locking device of the vehicle seat belt provided in this application;

[0020] Figure 2 This is a first-view structural schematic diagram of the base plate of the locking device for the vehicle seat belt provided in this application;

[0021] Figure 3 This is a second-view structural schematic diagram of the base plate of the locking device for the vehicle seat belt provided in this application;

[0022] Figure 4 This is a first-view structural schematic diagram of the housing of the locking device for the vehicle seatbelt provided in this application;

[0023] Figure 5This is a second-view structural schematic diagram of the housing of the locking device for the vehicle seatbelt provided in this application;

[0024] Figure 6 This is a schematic diagram of the locking mechanism of the vehicle seatbelt locking device provided in this application;

[0025] Figure 7 This is a schematic diagram of the structure of the locking device of the vehicle seat belt provided in this application, with the base plate installed in the housing;

[0026] Figure 8 This is a schematic diagram of the structure of the locking device for the vehicle seat belt provided in this application after the upper end cover and the base are engaged.

[0027] Figure 9 This is a structural diagram of the locking device of the vehicle seat belt provided in this application when the locking cylinder is in the installed state;

[0028] Figure 10 This is a schematic diagram of the locking device of the vehicle seat belt provided in this application when the lock is in the locked state;

[0029] Figure 11 yes Figure 10 Sectional view at point BB;

[0030] Figure 12 This is a schematic diagram showing the assembled vehicle seatbelt locking device provided in this application.

[0031] In the figure, 1. Housing; 101. Top cover; 102. Side cover; 103. Base; 104. Second opening; 105. Third opening; 106. Positioning groove; 107. Positioning edge; 108. Limiting protrusion; 1081. Vertical arm; 1082. Wedge rib; 109. First spring latch; 1010. First locking hole; 1011. Second spring latch; 1012. Second locking hole; 1013. Receiving groove; 1014. Locking block; 2. Base plate; 201. First opening; 202. 1. First notch; 203. Support part; 2031. Elastic arm; 2032. Support arm; 204. Positioning flange; 205. Double-sided flange structure; 206. Limiting part; 2061. Arc groove; 207. Step part; 208. Left side part; 209. Right side part; 2010. Front end part; 2011. Rear end part; 3. Lock head; 301. Columnar shaft; 302. Edge retainer; 303. Through hole; 304. Groove; 305. Installation error prevention notch; 4. Cable; 5. Safety belt. Detailed Implementation

[0032] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0033] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one 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 aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0035] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0036] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0037] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0038] like Figures 1-3 and Figures 6-12 As shown, a locking device for a vehicle seatbelt includes a base plate 2 connected to a seatbelt 5, a lock head 3 fixed to the vehicle body via a cable 4, and a housing 1. The housing 1 is used to accommodate the base plate 2 and / or the lock head 3, and has an opening for the cable 4 to pass through.

[0039] The lock head 3 includes a columnar shaft 301 and two symmetrically arranged side flanges 302 extending axially along the columnar shaft 301. The base plate 2 is provided with a first notch 202 for placing the lock head 3. The base plate 2 is formed with a left side portion 208, a right side portion 209, a front end portion 2010 and a rear end portion 2011 along the circumference of the first notch 202. The left side portion 208 and the right side portion 209 are respectively provided with a support portion 203 and a positioning flange 204 extending into the first notch 202. The rear end portion 2011 near the opening forms a limiting portion 206 for accommodating the cable 4.

[0040] The lock head 3 can be moved within the first notch 202 from an installed state near the front end 2010 to a locked state near the rear end 2011. The locked state is configured such that the limiting part 206 abuts against the axial end face of the lock head 3 to restrict the lock head 3 from moving away from the front end 2010, the support part 203 abuts against the first side of the stop 302, and the positioning flange 204 abuts against the second side opposite to the first side of the stop 302 to restrict the lock head 3 from rotating within the first notch 202.

[0041] A space is formed within the housing 1 to accommodate the base plate 2 and / or the lock head 3. The base plate 2 is installed within the housing 1. A first notch 202 for placing the lock head 3 is formed on the base plate 2, dividing the base plate 2 into a left side portion 208, a right side portion 209, a front end portion 2010, and a rear end portion 2011. A support portion 203 and a positioning flange 204 are formed on the inner sidewall of the first notch 202. The lock head 3 is installed within the first notch 202. When the lock head 3 is in the installed state, it is positioned within the first notch 202 near the front end portion 2010. At this time, the first side of the retaining edge 302 of the lock head 3 contacts the support portion 203, and the lock head 3 is oriented towards the direction near the limiting portion 206. When the axial end face of the lock head 3 abuts against the limiting part 206, the lock head 3 is in a locked state. At this time, the first side of the stop edge 302 of the lock head 3 abuts against the support part 203, and the second side of the stop edge 302 abuts against the positioning flange 204. The second side is the opposite side of the first side. By the support part 203 and the positioning flange 204 being distributed on opposite sides of the stop edge 302, the stop edge 302 can be limited to prevent the lock head 3 from rotating. At the same time, the limiting part 206 can prevent the lock head 3 from moving away from the front end 2010. A cable 4 is connected to the lock head 3. The cable 4 passes through the opening on the housing 1 and is fixed to the vehicle body to realize the connection between the lock head 3 and the vehicle body.

[0042] like Figures 2-3 and Figures 7-12As shown, in some embodiments, the substrate 2 has a reference plane, the positioning flange 204 extends into the first notch 202 on the reference plane, the support portion 203 and the limiting portion 206 both extend to one side of the reference plane, the positioning flange 204 is located between the support portion 203 and the limiting portion 206, the installation state is configured such that the first side of the retaining edge 302 abuts against the support portion 203 and the second side is placed on one side of the reference plane, and the cable 4 is placed in the limiting portion 206. Using the plate-shaped plane of the substrate 2 as a reference plane, the positioning flange 204 is in the same plane as the reference plane, and the support part 203 extends to one side of the reference plane, so that the support part 203 is at least partially below the horizontal plane of the positioning flange 204. When the lock head 3 is in the installation state, the first side of the stop 302 abuts against the support part 203, and the second side of the stop 302 is below the reference plane, ensuring that when the lock head 3 moves from the installation state to the locking state, the positioning flange 204 can abut against the second side of the stop 302. At the same time, the limiting parts 206 all extend to one side of the reference plane, and the upper surface of the limiting parts 206 forms an arc groove 2061, in which the cable 4 can be placed.

[0043] like Figure 6 and Figures 9-10 As shown, in some embodiments, the two side flanges 302 are located on the same radial plane and have the same width. When the lock head 3 is in the installed state or the locked state, the radial plane is parallel to the reference plane. Side flanges 302 are formed on opposite sides of the cylindrical shaft 301, and the two side flanges 302 are symmetrically distributed about the cylindrical shaft 301. When the lock head 3 is installed in the first notch 202, regardless of whether the lock head 3 is in the installed state or the locked state, the radial plane of the side flanges 302 is parallel to the reference plane, that is, the lock head 3 moves parallel to the reference plane when moving from the installed state to the locked state.

[0044] like Figures 2-3 and Figures 9-10 As shown, in some embodiments, the distance between the ends of the two support portions 203 and the distance between the ends of the two positioning flanges 204 are both greater than the width of the columnar shaft 301 and less than the distance between the ends of the two side flanges 302. The minimum distance between the two support portions 203 and the two positioning flanges 204 within the first notch 202 is less than the distance between the two side flanges 302, ensuring that the two support portions 203 and the two positioning flanges 204 can abut against the first and second sides of the two side flanges 302 respectively. At the same time, it is greater than the width of the columnar shaft 301, which can avoid interference between the support portions 203 and the positioning flanges 204 and the columnar shaft 301.

[0045] It should be noted that the support portion 203 includes an elastic arm 2031 extending in a direction away from the substrate 2. The end of the elastic arm 2031 extends in a direction close to the stop edge 302 to form a support arm 2032. The elastic arm 2031 abuts against the side of the stop edge 302, and the support arm 2032 abuts against the first side of the stop edge 302.

[0046] like Figure 3 , Figure 6 and Figure 9 As shown, in some embodiments, a mounting notch 305 is provided on one of the retaining edges 302, and a step portion 207 corresponding to the mounting notch 305 is formed in the first notch 202, so that the lock head 3 can only be installed in the first notch 202 in a specific direction and in the installed state. By providing a mounting notch 305 on one of the retaining edges 302, and forming a step portion 207 corresponding to the mounting notch 305 in the first notch 202, when the lock head 3 is installed in the first notch 202, due to the presence of the step portion 207, the lock head 3 can only be installed in the first notch 202 in a specific direction (i.e., the direction corresponding to the mounting notch 305 and the step portion 207) to ensure that the lock head 3 can be installed in the first notch 202 in the installed state.

[0047] like Figures 4-5 As shown, in some embodiments, the housing 1 includes an upper end cover 101, a side end cover 102, and a base 103. The upper end cover 101 and the side end cover 102 are both connected to the base 103 by hinges. After the upper end cover 101 is engaged with the base 103, it accommodates the front end portion 2010 of the substrate 2. After the side end cover 102 is engaged with the base 103, it accommodates the remaining part of the substrate 2 and / or the lock head 3. The front end portion 2010 is provided with a first opening 201 for the seat belt 5 to pass through and be fixed. The upper end cover 101 and the base 103 are respectively provided with a second opening 104 and a third opening 105 corresponding to the first opening 201. The upper end cover 101 is hinged to the upper part of the base 103, and the side end cover 102 is hinged to the side of the base 103. The front end 2010 of the substrate 2 is located in the space formed between the upper end cover 101 and the base 103. The substrate 2 has a first opening 201. At the same time, the upper end cover 101 and the base 103 are respectively provided with a second opening 104 and a third opening 105. When the substrate 2 is installed in the housing 1 and the upper end cover 101 is closed, the second opening 104 and the third opening 105 are in positions corresponding to the first opening 201, ensuring that the safety belt 5 can pass through the first opening 201 to realize the connection between the safety belt 5 and the substrate 2. The rest of the substrate 2 and the lock head 3 are located in the space formed between the side end cover 102 and the base 103, ensuring that the substrate 2 and the lock head 3 are both located in the internal space of the housing 1.

[0048] It should be noted that the base 103 has a receiving groove 1013 for accommodating the substrate 2 and the lock head 3. The receiving groove 1013 has a positioning groove 106 and / or positioning edge 107 for positioning and installing the substrate 2, so as to ensure the positioning and installation of the substrate 2.

[0049] like Figures 4-5 As shown, in some embodiments, the side end cover 102 is provided with a locking block 1014, configured such that during the installation of the lock head 3, only when the lock head 3 is in the locked state, the locking block 1014 can be inserted into the first notch 202 and the side end cover 102 can be engaged and fixed with the base 103. The locking block 1014 can abut against the axial end face of the lock head 3 to restrict the lock head 3 from moving towards the front end portion 2010. A locking block 1014 is provided on the top. When the lock head 3 is in the installed state, when the side end cover 102 is closed, the locking block 1014 and the lock head 3 will interfere with each other, causing the side end cover 102 to fail to close. When the lock head 3 is in the locked state, when the side end cover 102 is closed, the locking block 1014 is embedded in the first notch 202, ensuring that the side end cover 102 can be engaged and fixed with the base 103. The locking block 1014 abuts against the axial end face of the lock head 3, which can prevent the lock head 3 from moving away from the limiting part 206.

[0050] like Figures 4-5 As shown, in some embodiments, the upper end cover 101 is provided with a first spring buckle 109 on the side near the base 103, and the base 103 is provided with a first locking hole 1010 corresponding to the first spring buckle 109. The side end cover 102 is provided with a second spring buckle 1011 on the side near the base 103, and the base 103 is provided with a second locking hole 1012 corresponding to the second spring buckle 1011. By providing the first spring buckle 109 on the upper end cover 101, the base 101... The upper end cover 102 is provided with a first locking hole 1010. When the upper end cover 101 is closed on the base 103, the first spring buckle 109 is inserted into the first locking hole 1010 to ensure the stability of the upper end cover 101 after it is closed with the base 103. The side end cover 102 is provided with a second spring buckle 1011, and the base 103 is provided with a second locking hole 1012. When the side end cover 102 is closed on the base 103, the second spring buckle 1011 is inserted into the second locking hole 1012 to ensure the stability of the side end cover 102 after it is closed with the base 103.

[0051] like Figure 6 and Figures 9-11As shown, in some embodiments, the cable 4 is a steel wire rope, and the columnar shaft 301 has a through hole 303 along its axial direction for connecting with the steel wire rope. The steel wire rope is riveted to the columnar shaft 301 and a groove 304 is formed on its surface. The base 103 has a limiting protrusion 108, which engages with the groove 304 only when the lock head 3 is in the locked state. The cable 4 is a steel wire rope, and the columnar shaft 301... The upper part has a through hole 303 for connecting with the wire rope. The wire rope is connected to the columnar shaft 301 by a riveting connection to ensure the connection effect between the wire rope and the columnar shaft 301. A groove 304 is formed on the surface of the columnar shaft 301. A limiting protrusion 108 corresponding to the groove 304 is formed on the base 103. When the lock head 3 is in the locked state, the limiting protrusion 108 is at least partially engaged with the groove 304 to limit the lock head 3 and prevent the lock head 3 from moving.

[0052] like Figures 4-5 and Figure 11 As shown, in some embodiments, the limiting protrusion 108 includes a vertical arm perpendicular to the plane of the base 103 and a wedge-shaped rib 1082 connecting the vertical arm 1081 and the plane of the base 103 respectively. Along the direction close to the front end 2010, the distance between the inclined surface of the wedge-shaped rib 1082 and the base 103 gradually decreases. When the lock head 3 is in the locked state, the vertical arm 1081 is at least partially embedded in the groove 304, and the vertical arm 1081 abuts against the inner wall of the groove 304 to restrict the lock head 3 from moving towards the front end 2010. When the lock head 3 moves from the installed state to the locked state, the lock head 3 moves along the wedge-shaped rib 1082 until the vertical arm 1081 is embedded in the groove 304, and the lock head 3 reaches the locked state. When the lock head 3 is in the locked state, the vertical arm 1081 abuts against the inner wall of the groove 304, which can limit the lock head 3 and prevent the lock head 3 from moving towards the front end 2010.

[0053] like Figure 2 and Figure 8 As shown, in some embodiments, a double-sided flange structure 205 is formed at the edge of the first opening 201. The double-sided flange structure 205 protrudes from the second opening 104 and the third opening 105 respectively. The double-sided flange structure 205 can withstand greater force and avoid damage to the first opening 201 caused by excessive tension of the seat belt 5.

[0054] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the method embodiments described later are relatively simple in description since they correspond to the system, and relevant parts can be referred to the descriptions in the system embodiments.

[0055] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A locking device for a vehicle seatbelt, comprising a base plate connected to the seatbelt, a locking head fixed to the vehicle body via a cable, and a housing, wherein the housing is used to accommodate the base plate and / or the locking head, and has an opening for the cable to pass through, characterized in that, The lock head includes a cylindrical shaft and two symmetrically arranged side flanges extending axially along the cylindrical shaft. The base plate has a first notch for placing the lock head. The base plate along the circumference of the first notch forms a left side portion, a right side portion, a front end portion, and a rear end portion. The left side portion and the right side portion are respectively provided with a support portion and a positioning flange extending into the first notch. The rear end portion near the opening forms a limiting portion for accommodating the cable. The lock head can be moved within the first notch from an installed state near the front end to a locked state near the rear end. The locked state is configured such that the limiting portion abuts against the axial end face of the lock head to restrict the lock head from moving away from the front end, the supporting portion abuts against the first side of the stop, and the positioning flange abuts against the second side opposite to the first side of the stop to restrict the lock head from rotating within the first notch.

2. The locking device for a vehicle seatbelt according to claim 1, characterized in that, The substrate has a reference plane, the positioning flange extends into the first notch on the reference plane, the support portion and the limiting portion both extend to one side of the reference plane, the positioning flange is located between the support portion and the limiting portion, the installation state is configured such that the first side of the retaining edge abuts against the support portion and the second side is placed on one side of the reference plane, and the cable is placed in the limiting portion.

3. The locking device for a vehicle seatbelt according to claim 2, characterized in that, Both side flanges are located on the same radial plane and have the same width. When the lock head is in the installed state or the locked state, the radial plane is parallel to the reference plane.

4. The locking device for a vehicle seatbelt according to claim 3, characterized in that, The distance between the ends of the support portions on both sides and the distance between the ends of the positioning flanges on both sides are both greater than the width of the columnar shaft and less than the distance between the ends of the side flanges on both sides.

5. The locking device for a vehicle seatbelt according to claim 1, characterized in that, An installation error prevention notch is provided on one of the flanges, and a step portion corresponding to the installation error prevention notch is formed in the first notch, so that the lock head can only be installed in the first notch in a specific direction and in the installation state.

6. The locking device for a vehicle seatbelt according to any one of claims 1-5, characterized in that, The housing includes an upper end cover, a side end cover, and a base. The upper end cover and the side end cover are both connected to the base by hinges. After the upper end cover engages with the base, it accommodates the front end of the substrate. After the side end cover engages with the base, it accommodates the remaining part of the substrate and / or the lock head. The front end is provided with a first opening for the seat belt to pass through and be fixed. The upper end cover and the base are respectively provided with a second opening and a third opening corresponding to the first opening.

7. The locking device for a vehicle seatbelt according to claim 6, characterized in that, The side end cover is provided with a locking block, which is configured such that during the installation of the lock head, the locking block can be inserted into the first notch and the side end cover can be engaged and fixed with the base only when the lock head is in the locked state. The locking block can abut against the axial end face of the lock head to restrict the lock head from moving towards the front end.

8. The locking device for a vehicle seatbelt according to claim 7, characterized in that, The cable is a steel wire rope. The columnar shaft has a through hole along its axial direction for connecting with the steel wire rope. The steel wire rope is connected to the columnar shaft by press riveting and a groove is formed on the surface. The base is provided with a limiting protrusion. The limiting protrusion engages with the groove only when the lock head is in the locked state.

9. The locking device for a vehicle seatbelt according to claim 8, characterized in that, The limiting protrusion includes a vertical arm perpendicular to the base plane and wedge-shaped ribs connecting the vertical arm and the base plane respectively. Along the direction close to the front end, the distance between the inclined surface of the wedge-shaped rib and the base gradually decreases. When the lock head is in the locked state, the vertical arm is at least partially embedded in the groove, and the vertical arm abuts against the inner wall of the groove to restrict the lock head from moving towards the direction close to the front end.

10. The locking device for a vehicle seatbelt according to claim 6, characterized in that, A double-sided flange structure is formed at the edge of the first opening, and the double-sided flange structure protrudes from the second opening and the third opening respectively.

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