Seatbelt latch and car

Abstract

This invention provides a seatbelt latch and a car. The seatbelt latch includes a latch body, a support shaft, a locking device, and a return member. The locking device is rotatable around the support shaft between a first position and a second position. One end of the return member is connected to the locking device, and the other end is mounted on the latch body. The latch works in conjunction with the seatbelt, which passes through the steering section and wraps around the locking device and the support shaft. The locking device includes a contact surface, a connecting surface, a chamfered portion, and a pressing surface. The support shaft includes a top surface, a first side surface, a bottom surface, and a second side surface connected in sequence. The connecting surface matches the top surface of the support shaft. This invention, through the rotation of the locking device, clamps the webbing, reducing webbing slippage and avoiding excessive chest pressure caused by the lap belt pulling the shoulder strap webbing during a collision.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobiles, in particular to a safety belt lock tongue and a car. BACKGROUND

[0002] The lock tongue is located at the turning point of the shoulder strap end and the waist strap end in a three-point safety belt (also known as a belt), the waist strap end limits the pelvis of the occupant in a restraint situation, and the shoulder strap end protects the upper body of the occupant from moving forward. The lock tongue is connected with the belt by using its belt groove, so that the lock tongue can move freely on the belt. Thus, the length of the two ends of the belt on the safety belt can be matched with the occupant, so that the belt is uniformly attached to the occupant.

[0003] In general, in a force-limited retractor, in a collision situation, when the safety belt retractor is locked, the belt tension of the shoulder strap end and the waist strap end rises synchronously, and after reaching a certain tension, the belt tension of the shoulder strap end no longer rises, at this time the tension of the waist strap end will be greater than that of the shoulder strap side. Since the belt (also known as the safety belt) can move along the lock tongue belt groove, the tension of the waist strap end can be transmitted to the shoulder strap side, increasing the force at the lower shoulder strap, and further causing the chest compression force of the occupant to increase, which cannot effectively protect the safety of the occupant.

[0004] Currently, there are ways to solve the above problems, such as the solutions provided by patent documents CN106455762B, CN102406286B and CN113795410A, which can solve the above problems by locking the safety belt.

[0005] However, the current solutions still have the following risks: when the force difference between the waist strap side and the shoulder strap side is small, the locking force provided by the locking device is insufficient, and there is still a large amount of slip of the belt at the lock tongue, which reduces the protection effect of the safety belt. At the same time, when the force difference between the waist strap side and the shoulder strap side is large, the locking device is not designed to limit the travel, which may cause the belt to be cut off due to excessive locking force. SUMMARY

[0006] In view of the defects in the prior art, the purpose of the present application is to provide a safety belt lock tongue and a car.

[0007] According to the safety belt lock tongue provided by the present application, the safety belt lock tongue comprises a lock tongue body, a support shaft and a locking device.

[0008] The support shaft is installed on the lock tongue body, and the locking device is in rotational cooperation with the support shaft.

[0009] The locking device comprises a connecting surface and a chamfered portion.

[0010] The support shaft comprises a support shaft top surface and a first side surface, the connecting surface and the support shaft top surface are mutually matched arc surfaces and can rotate relative to each other.

[0011] The safety belt lock is used with the safety belt; and has an unlock state and a locking state which can be switched with each other;

[0012] When in the unlock state, the safety belt can slide relative to the lock; when in the locking state, the safety belt cannot slide relative to the lock and the chamfer portion abuts against the first side surface.

[0013] Preferably, the connecting surface and the top surface of the support shaft are both circular arc surfaces.

[0014] Preferably, the lock body comprises a turning portion, a lock insertion portion and an intermediate connecting portion; the turning portion and the lock insertion portion are connected through the intermediate connecting portion; the intermediate connecting portion is provided with a first mounting groove for mounting the support shaft and the locking device;

[0015] The safety belt passes through the turning portion and wraps the locking device and the support shaft;

[0016] The locking device further comprises a contact surface and a pressing surface;

[0017] The support shaft further comprises a bottom surface and a second side surface;

[0018] The top surface, the first side surface, the bottom surface and the second side surface of the support shaft are connected in sequence;

[0019] The locking device can rotate around the support shaft between a first position and a second position; the first position is a position where the locking device is away from the lock insertion portion, and the second position is a position where the locking device is close to the lock insertion portion;

[0020] When in the unlock state, the locking device is located at the first position, the pressing surface does not contact the safety belt; and the safety belt can slide relative to the lock;

[0021] When in the locking state, the locking device is located at the second position, the pressing surface presses the safety belt on the lock insertion portion; and the safety belt cannot slide relative to the lock.

[0022] Preferably, the locking device further comprises a return member

[0023] One end of the return member is connected with the locking device, and the other end is mounted on the intermediate connecting portion;

[0024] Preferably, the lock insertion portion comprises a plastic coating layer and a metal insert; the plastic coating layer is wrapped around one end of the metal insert; the plastic coating layer is provided with a locking support portion, and the shape of the locking support portion matches the shape of the pressing surface.

[0025] Preferably, the turning part, the lock insertion part and the intermediate connecting part are integrally connected.

[0026] Preferably, the number of the return members is 2, which are arranged at two ends of the support shaft respectively.

[0027] Preferably, when the locking device is in the unlocking state, the contact surface of the locking device is lower than the bottom surface of the support shaft.

[0028] Preferably, when the locking device is in the locking state, the contact surface of the locking device is higher than the bottom surface of the support shaft. According to the automobile provided by the application, the safety belt lock tongue is adopted.

[0029] Compared with the prior art, the application has the following beneficial effects:

[0030] 1. In the unlocking state, the pressing surface does not contact the safety belt, so that the safety belt does not generate a reverse torque on the locking device in the unlocking state, and the locking device can be quickly locked.

[0031] 2. In the locking state, the force of the pressing surface pressing the safety belt on the lock insertion part is not the larger the better, the contact surface of the locking device is higher than the bottom surface of the support shaft, and the first side surface is in abutment with the chamfered part, so that the pressing force on the safety belt is reduced to a certain extent, the safety belt is prevented from being excessively pressed to cause the safety belt to be broken, and the phenomenon that the material requirement of the locking support part is too high is avoided.

[0032] 3. The safety belt is clamped by the rotation of the locking device, the sliding of the safety belt is reduced, and the problem that the chest compression force is too large due to the side pulling of the waist belt to the side of the shoulder belt during the collision is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0033] Other features, objects and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments with reference to the attached drawings:

[0034] Figure 1 It is an explosion schematic diagram of the application;

[0035] Figure 2 It is a schematic diagram of the overall structure of the application;

[0036] Figure 3 It is a comparison diagram of the unlocking state and the locking state of the application;

[0037] Figure 4 It is a schematic diagram of the structure of the application when not in use;

[0038] Figure 5 It is a schematic diagram of the unlocking state of the application;

[0039] Figure 6 Fig. 2 is a schematic view of the process of switching from the unlocked state to the locked state of the present application;

[0040] Figure 7 Fig. 3 is a schematic view of the locked state of the present application;

[0041] Figure 8 Fig. 4 is a partial enlarged view of Fig. 3; Figure 5

[0042] Figure 9 Fig. 5 is a partial enlarged view of Fig. 3. Figure 7 Fig. 6 shows:

[0043]

[0044]

[0045] DETAILED DESCRIPTION The present application will be described in detail below with specific embodiments. The following examples will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of changes and improvements can be made. These are within the scope of the present application.

[0046] The present application provides a safety belt lock tongue, as shown in Fig. 1, comprising a lock tongue body 1, a support shaft 2, a locking device 3 and a return member 4; in one preferred example, the return member 4 is a torsion spring.

[0047] Figures 1-2 The lock tongue body 1 comprises a turning portion 11, a lock insertion portion 12 and an intermediate connecting portion 13, the turning portion 11 and the lock insertion portion 12 are connected by the intermediate connecting portion 13; preferably, the turning portion 11, the lock insertion portion 12 and the intermediate connecting portion 13 are integrally connected. The intermediate connecting portion 13 is provided with a first mounting groove 131, the first mounting groove is used to mount the support shaft 2 and the locking device 3, wherein the support shaft 2 is tightly connected with the intermediate connecting portion 13.

[0048] The locking device is located between the support shaft 2 and the turning portion 11 and is limited by both and cannot be removed. The locking device 3 can rotate around the support shaft 2 between a first position and a second position, the first position is the position of the locking device 3 away from the lock insertion portion 12, and the second position is the position of the locking device 3 close to the lock insertion portion 12.

[0049] The locking device is located between the support shaft 2 and the turning portion 11 and is limited by both and cannot be removed. The locking device 3 can rotate around the support shaft 2 between a first position and a second position, the first position is the position of the locking device 3 away from the lock insertion portion 12, and the second position is the position of the locking device 3 close to the lock insertion portion 12.

[0050] ​​One end of the reset member 4 is connected with the locking device 3, and the other end is installed on the intermediate connecting part 13; specifically, the reset member 4 is sleeved on the support shaft 2, the intermediate connecting part 13 is provided with a containing hole, and the main body part of the reset member 4 is located in the containing hole. In a preferred example, the number of the reset member 4 is 2, which are arranged at the two ends of the support shaft 2, respectively.

[0051] The lock insertion part 12 includes a plastic-coated layer 121 and a metal insert 122, and the plastic-coated layer 121 is wrapped around one end of the metal insert 122; the plastic-coated layer 121 is provided with a locking support part 123, and the shape of the locking support part 123 matches the shape of the pressing surface 34; in a preferred example, the pressing surface 34 is a semicircular arc, and the locking support part 123 is a semicircular groove.

[0052] The lock tongue is used in cooperation with the safety belt 100, the safety belt 100 penetrates from the turning part 11 and wraps the locking device and the support shaft 2.

[0053] The locking device 3 includes a contact surface 31, a connecting surface 32, a chamfer part 33 and a pressing surface 34; the support shaft 2 includes a support shaft top surface 21, a first side surface 22, a support shaft bottom surface 23 and a second side surface 24 connected in sequence; in a preferred example, the connecting surface 32 and the support shaft top surface 21 are both arc surfaces, the first side surface 22 and the second side surface 24 are both flat surfaces, specifically, the connecting surface 32 and the support shaft top surface 21 are in arc contact, and the locking top surface 35 of the locking device 3 is in arc contact with the turning bottom surface 111 of the turning part 11, more specifically, the support shaft top surface 21 is a semicircular surface, i.e. a semicircular arc surface, and the connecting surface 32 is a semicircular groove. The contact surface 31 is also an arc surface. In the above preferred example, the support shaft 2 can be divided into an upper part and a lower part, the upper part is a standard circular arc, the lower part is a square, and the whole is a special-shaped structure. The connecting surface 32 and the support shaft top surface 21 match each other; preferably, the locking device 3 is further provided with a first mounting position 36, which is used to connect with one end of the reset member 4.

[0054] As shown in Figures 3-9 The safety belt lock tongue has an unlocking state and a locking state which can be switched with each other, and the unlocking state is switched to the locking state due to the force difference of the safety belt, and the locking of the braid is realized, and the locking state is switched to the unlocking state by using the rebounding force of the reset member 4.

[0055] When in the unlocking state, the locking device 3 is in the first position, the turning part 11, the support shaft 2 and the contact surface 31 are all in contact with the safety belt 100, and the pressing surface 34 is not in contact with the safety belt 100; the safety belt 100 can slide relative to the lock tongue. The design that the pressing surface 34 is not in contact with the safety belt 100 makes the safety belt not generate a reverse torque to the locking device 3 when in the unlocking state, so that the locking device 3 can be locked quickly, the sliding amount of the safety belt at the lock tongue in the whole collision process is effectively reduced, and the passenger protection is better. It is worth noting that, since the tension on the safety belt increases linearly when the collision occurs, the contact surface 31 of the locking device 3 is lower than the bottom surface 23 of the support shaft when the locking device is in the unlocking state, so that the force on the safety belt can act more on the locking device, and the locking device can be ensured to act quickly.

[0056] In the process of switching from the unlocking state to the locking state, the locking device 3 rotates relative to the support shaft 2, that is, the locking device 3 rotates from the first position to the second position; the return member 4 rotates together with the locking device 3 relative to the support shaft 2. Since the return member 4 is in the elastic deformation region, the return of the safety belt after the force is unloaded can be realized, and such a structure arrangement is also relatively compact.

[0057] When in the locking state, the locking device 3 is in the second position, the pressing surface 34 presses the safety belt 100 on the lock buckle insertion part 12, specifically, on the locking support part 123; the safety belt 100 cannot slide relative to the lock tongue, that is, the locking of the safety belt is realized.

[0058] It is worth noting that the force with which the pressing surface 34 presses the safety belt 100 on the lock buckle insertion part 12 is not the larger the better. If the pressing force is too large, there is a risk that the safety belt will be pressed off, and if the pressing force is too large, the material requirement for the locking support part 123 will also be particularly high. Considering this factor, in the process of switching from the unlocking state to the locking state, the contact surface 31 of the locking device 3 moves to a position higher than the bottom surface 23 of the support shaft, so that more force on the safety belt acts on the bottom surface 23 of the support shaft, and the force on the contact surface 31 of the locking device 3 only slowly increases on the basis of maintaining the locking state, so as to relieve the load of the lock buckle insertion part 12. And when the present application is in the locking state, the chamfer part 33 is designed to abut against the first side surface 22, the locking device 3 is limited by the first side surface 22 of the support shaft 2 and cannot rotate further, and is maintained in the locking state, so as to avoid the risk that the safety belt is pressed off due to too large locking force, and this design can also reduce the load of the lock buckle insertion part 12 to a certain extent.

[0059] In addition, the locking device of the present application rotates to switch between the unlocked state and the locked state, relative to the locking device of the comparative file CN102406286B and CN113795410A which slides to switch between the unlocked state and the locked state. The component force in the direction of the movement of the locking device is larger. When the force difference between the waist belt side and the shoulder belt side is small, a larger locking force can be provided.

[0060] The present application also provides an automobile adopting the safety belt lock tongue.

[0061] The working principle of the present application is as follows: Figures 4-9 As shown in the figure, Figure 4 is a state diagram when the driver does not wear the safety belt. When the driver wears the safety belt and the car collides, as shown in the figure, Figures 5-9 a certain force difference is generated between the shoulder belt side 102 and the waist belt side 101, which is greater than the elastic force of the return member, and the force difference drives the locking device 3 on the lock tongue through the waist belt side 101 to rotate, thereby clamping the belt and reducing the sliding of the belt. When the car collides, the waist belt side pulls the shoulder belt side, thereby increasing the tension of the shoulder belt side, which can cause excessive compression force on the chest and excessive displacement of the pelvic bone. When the collision ends, the pressure of the shoulder belt side 102 and the waist belt side 101 is equal, and the locking device 3 returns to the unlocked state under the elastic force of the return member 4.

[0062] The present application designs the top surface 21 of the support shaft as a semicircular arc surface. When the car collides and the force difference between the waist belt side and the shoulder belt side is small (such as when the car receives a small impact force), the component force of the safety belt acting on the locking device 3 is larger, i.e. a larger clamping force can be provided. In addition, the present application also designs the pressing surface as a semicircular arc, so that the area of the pressing surface acting on the safety belt is smaller and the pressure is larger, further providing a larger clamping force. In addition, the present application also prevents the locking force of the safety belt from being too large when the force difference between the waist belt side and the shoulder belt side is large (such as when the car receives a large impact force), which can cause the safety belt to be broken. In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0063] Those skilled in the art know that, in addition to implementing the system, device and each module thereof provided by the present application in the form of pure computer readable program code, the same program can also be implemented in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers and embedded microcontrollers, etc. by logically programming the method steps. Therefore, the system, device and each module thereof provided by the present application can be considered as a hardware component, and the modules included therein for implementing various programs can also be considered as structures in the hardware component; the modules for implementing various functions can also be considered as both software programs for implementing methods and structures in the hardware component.

[0064] The specific embodiments of the present application are described above. It needs to be understood that the present application is not limited to the specific embodiments described above, and various changes or modifications can be made by those skilled in the art within the scope of the claims, which does not affect the essential content of the present application. The embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily without conflict.

Claims

1. A seat belt tongue, characterized in that Including the lock tongue body (1), support shaft (2), locking device (3); The support shaft (2) is installed on the lock tongue body (1), and the locking device (3) is in rotating cooperation with the support shaft (2); The locking device (3) includes a connecting surface (32) and a chamfer portion (33); The support shaft (2) includes a support shaft top surface (21) and a first side surface (22); the connecting surface (32) and the support shaft top surface (21) are mutually matched arc surfaces and can rotate relative to each other; The safety belt lock tongue is used in cooperation with a safety belt (100); and has an unlocking state and a locking state which can be switched relative to each other; When in the unlocking state, the safety belt (100) can slide relative to the safety belt lock tongue; when in the locking state, the safety belt (100) cannot slide relative to the safety belt lock tongue and the chamfer portion (33) abuts against the first side surface (22); The connecting surface (32) and the support shaft top surface (21) are both circular arc surfaces; The lock tongue body (1) includes a turning portion (11), a lock catch insertion portion (12) and an intermediate connecting portion (13); the turning portion (11) and the lock catch insertion portion (12) are connected through the intermediate connecting portion (13); the intermediate connecting portion (13) is provided with a first mounting groove (131) for mounting the support shaft (2) and the locking device (3); The safety belt (100) penetrates from the turning portion (11) and wraps the locking device and the support shaft (2); The locking device (3) further includes a contact surface (31) and a pressing surface (34); The support shaft (2) further includes a support shaft bottom surface (23) and a second side surface (24); The support shaft top surface (21), the first side surface (22), the support shaft bottom surface (23) and the second side surface (24) are sequentially connected; The locking device (3) can rotate around the support shaft (2) between a first position and a second position; the first position is a position where the locking device (3) is away from the lock catch insertion portion (12), and the second position is a position where the locking device (3) is close to the lock catch insertion portion (12); When in the unlocking state, the locking device (3) is located at the first position, and the pressing surface (34) does not contact the safety belt (100); When in the locking state, the locking device (3) is located at the second position, and the pressing surface (34) presses the safety belt (100) on the lock catch insertion portion (12); The lock catch insertion portion (12) includes a plastic coating layer (121) and a metal insert (122); the plastic coating layer (121) covers one end of the metal insert (122); the plastic coating layer (121) is provided with a locking support portion (123), and the shape of the locking support portion (123) matches the shape of the pressing surface (34).

2. The belt buckle of claim 1, wherein Further comprising a return member (4) One end of the return member (4) is connected with the locking device (3), and the other end is mounted on the intermediate connecting portion (13).

3. The belt buckle of claim 1, wherein, The turning portion (11), the lock catch insertion portion (12) and the intermediate connecting portion (13) are integrally connected.

4. The belt buckle of claim 2, wherein, The number of the return members (4) is 2, which are arranged at both ends of the support shaft (2) respectively.

5. The belt buckle of claim 1, wherein, When the locking device is in the unlocked state, the contact surface (31) of the locking device (3) is lower than the bottom surface (23) of the support shaft.

6. The belt buckle of claim 1, wherein, When the locking device is in the locked state, the contact surface (31) of the locking device (3) is higher than the bottom surface (23) of the support shaft.

7. An automobile characterized by comprising: The safety belt lock tongue according to any one of claims 1-6.

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