WO2019141047A1

WO2019141047A1 - Seat belt buckle for a vehicle seat belt system as well as a vehicle

Info

Publication number: WO2019141047A1
Application number: PCT/CN2018/123025
Authority: WO
Inventors: Zhigang Wang
Original assignee: Trw Automotive Technologies (Shanghai) Co., Ltd.
Priority date: 2018-01-19
Filing date: 2018-12-24
Publication date: 2019-07-25
Also published as: CN110053581A; CN110053581B

Abstract

A seat belt buckle (1) for a vehicle seat belt system, comprising a buckle head (2) and a housing. The seat belt buckle (1) further comprises a feeding means for moving the buckle head (2), the feeding means including a cylindrical buckle connector (3) connected to the buckle head (2), a switching mechanism for switching the buckle head (2) between a locked state and an unlocked state, a rack (4) connected to the buckle connector (3) and a motor (6) operatively connected with the rack (4), wherein the motor (6) is configured to move the rack (4) linearly so as to be able to drive the buckle connector (3 )along with the buckle head (2) to move. The switching mechanism has a depressing member (7), a guide member (8), a swivel member (9), and a preloading member (10), wherein the depressing member (7) is disposed on the buckle connector (3), the guide member (8) is disposed on the housing and configured to be able to be ran through by the buckle connector (3) together with the depressing member (7), the swivel member (9) is rotatably and movably sleeved on the buckle connector (3), and the preloading member (10) is configured for preloading the swivel member (9) towards the guide member (8). And a vehicle having such seat belt buckle (1).

Description

SEAT BELT BUCKLE FOR A VEHICLE SEAT BELT SYSTEM AS WELL AS A VEHICLE

Technical Field

The present invention relates to a seat belt buckle for a vehicle seat belt system and relates to a vehicle having such seat belt buckle.

Background Art

The so-called seat belt buckle feeders are known from the prior art, which can move a seat belt buckle from a normal position to a feeding position, so that a passenger can easily reach the seat belt buckle, to facilitate fastening a seat belt by a passenger. After the passenger fastens the seat belt, the seat belt buckle feeder moves the seat belt buckle back from the feeding position to the normal position. Such seat belt buckle feeders for example may refer to the patent publications CN104718112B, WO2016/110309 and DE102015016469A1.

A seat belt buckle feeder should be constructed as compact and cost-effective as possible, and at the same time should also ensure that the seat belt buckle cannot be pulled out from the normal position even when high forces are acting on the belt buckle, for example in the case of accident.

CONTENT OF THE INVENTION

The object of the present invention is to provide a seat belt buckle and a vehicle having seat belt buckle that can feed a seat belt buckle head to a user and at the same time can reliably effectuate locking a buckle head.

The first aspect of the present invention relates to a seat belt buckle for a vehicle seat belt system. The seat belt buckle comprises a buckle head and a housing held in the vehicle. The seat belt buckle further comprises a feeding means for moving the buckle head along a feeding direction and a retracting direction, the feeding means including a cylindrical buckle connector connected to the buckle head, a switching mechanism for switching the buckle head between a locked state and an unlocked state, a rack connected to the buckle connector and a motor operatively connected with the rack, wherein the motor is configured to move the rack linearly so as to be able to drive the buckle connector along with the buckle head to move along the feeding direction and the retracting direction. The switching mechanism has a depressing member, a guide member, a swivel member, and a preloading member, wherein the depressing member is disposed on the buckle connector, the guide member is disposed on the housing and configured to be able to be ran through by the buckle connector together with the depressing member, a plurality of first runners and a plurality of first protruding ribs are alternately provided in a circumferential direction of the guide member and the plurality of first protruding ribs are respectively provided with a first tooth at an end proximate to the swivel member, a plurality of second runners and a plurality of second protruding ribs are alternately provided in a circumferential direction of the swivel member, and the plurality of second protruding ribs are respectively provided with a second tooth at an end proximate to the guide member, the swivel member is sleeved on the buckle connector in a manner of being rotatable about an axis of the buckle connector and being movable along the axis of the buckle connector, and the preloading member is configured for preloading the swivel member towards the guide member. The depressing member is configured for cooperating with the preloading member in operation such that the buckle head is switched between a locked state, in which the second tooth is engaged with a respective first tooth under the action of the preloading member, and an unlocked state, in which the second protruding ribs are slidable in the respective first runners and at the same time the second runners can be slidden through by the respective first protruding ribs.

With the seat belt buckle according to the present invention, it is possible to realize the feeding and retracting of the buckle head and at the same time reliably realize the locking of the buckle head by the same mechanism.

In one extended solution of the seat belt buckle according to the present invention, the switching mechanism may be configured for switching the buckle head from the locked state to the unlocked state in the following manner: the depressing member is moved towards the swivel member until the depressing member is in contact with the second tooth under the action of the rack driven by the motor, so as to drive the swivel member to move away from the guide member, until a first critical point of the guide member is crossed by the second tooth of the swivel member or a first critical point of the swivel member is crossed by the first tooth of the guide member, such that the second protruding ribs enter the respective first runners under the action of the preloading member.

In one extended solution of the seat belt buckle according to the present invention, the switching mechanism may be configured for switching the buckle head from the unlocked state to the locked state in the following manner: the depressing member is moved towards the swivel member until the depressing member is in contact with the second tooth under the action of the rack driven by the motor, so as to drive the second protruding ribs of the swivel member to move in the respective first runners, until a second critical point of the guide member is crossed by the second tooth of the swivel member or a second critical point of the swivel member is crossed by the first tooth of the guide member, such that the second tooth swivels and is engaged into the respective first tooth under the action of the preloading member.

In one extended solution of the seat belt buckle according to the present invention, the first tooth may respectively include a first ramp, a first vertical surface and a second ramp, the first ramp and the second ramp may have the same direction and size in slope, wherein the first ramp extends towards a direction away from the guide member from a first edge of the first tooth until intersecting with one end of the first vertical surface, the interface of the first ramp and the first vertical surface constitutes the first critical point, the second ramp extends towards the guide member from a second edge of the first tooth until intersecting with the other end of the first vertical surface, the second edge of the first tooth constitutes the second critical point and the first vertical surface together with the second ramp forms a groove, while the second tooth has a shape complementary to the groove so that the second tooth is engaged in the respective groove under the action of the preloading member in the locked state. With the configuration of the ramp, it is possible to easily effectuate switching between the unlocked state and the locked state.

In one extended solution of the seat belt buckle according to the present invention, the second tooth may respectively include a third ramp, a second vertical surface and a fourth ramp, the third ramp and the fourth ramp may have the same direction and size in slope, wherein the third ramp extends towards a direction away from the swivel member from a first edge of the second tooth until intersecting with one end of the second vertical surface, the interface of the third ramp and the second vertical surface constitutes the first critical point, the fourth ramp extends towards the swivel member from a second edge of the second tooth until intersecting with the other end of the second vertical surface, the second edge of the second tooth constitutes the second critical point and the second vertical surface together with the fourth ramp forms a groove, while the first tooth has a shape complementary to the groove so that the first tooth is engaged in the respective groove under the action of the preloading member in the locked state.

In one extended solution of the seat belt buckle according to the present invention, at least one of the depressing member, the guide member, the swivel member and the preloading member may be arranged coaxially with the buckle connector.

In one extended solution of the seat belt buckle according to the present invention, the seat belt buckle may have an electrical means for identifying whether the buckle head is inserted by a seat belt lock tongue. When the electrical means identifies that the buckle head has been inserted by the seat belt lock tongue, the motor is driven to rotate reversely to start the locking process.

In one extended solution of the seat belt buckle according to the present invention, the motor may be operatively connected to the rack through a first gear. Preferably, a second gear may also be provided between the first gear and the rack. The motor firstly transfers a torque to the second gear, which is for example constructed to be a helical gear. Then the second gear transfers the torque further to the first gear which is for example constructed to be a cylindrical gear, and finally the torque is transferred via the first gear to the rack, so as to effectuate converting a rotational movement of the motor into a linear movement of the rack. Certainly, the motor may be a linear motor so as to directly drive the rack to perform linear movement.

In one extended solution of the seat belt buckle according to the present invention, the preloading part may be fixedly socketed in the buckle connector.

In one extended solution of the seat belt buckle according to the present invention, the preloading member and the swivel member may have mutually repelling magnetic properties, thereby generating a preload. Certainly, the preloading member may also be an elastic member, for example a helical spring, and always be in contact with the swivel member.

In one extended solution of the seat belt buckle according to the present invention, the depressing element may be integrally formed on the buckle connector. Further preferably, the depressing member may be detachably or non-detachably mounted on the buckle connector.

In one extended solution of the seat belt buckle according to the present invention, the rack may be integrally formed on an end of the buckle connector. Further preferably, the rack may also be detachably or non-detachably mounted on an end of the buckle connector.

In one extended solution of the seat belt buckle according to the present invention, a hole may be centrally provided on the buckle connector, and the buckle head is clamped in the hole by means of a steel wire. Further preferably, a steel wire may be integrally formed on one end of the buckle connector, and the steel wire is connected to the buckle head.

The second aspect of the invention relates to a vehicle having the seat belt buckle according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is exemplarily described in detail below by the embodiments with reference to the drawings. These embodiments should not be restrictive for the present invention, but may be used for better understanding the present invention. Among them,

Figure 1 shows a schematic perspective view of the seat belt buckle according to the present invention;

Figure 2 shows an exploded view of the seat belt buckle in Figure 1;

Figure 3 shows an enlarged detail view of the feeding means according to the present invention;

Figure 4 shows a schematic view of a first embodiment of the switching mechanism according to the present invention;

Figure 5 shows a schematic view of the switching mechanism of Figure 4 in a locked state;

Figure 6 shows a schematic view similar to Figure 5;

Figure 7 shows a schematic view of the switching mechanism of Figure 6 in an unlocked state;

Figure 8 shows a schematic view of the switching mechanism of Figure 7 feeding the buckle head along a feeding direction;

Figure 9 shows a schematic view similar to Figure 8;

Figure 10 shows a schematic view of the switching mechanism of Figure 9 when starting the locking;

Figure 11 shows a schematic view of the switching mechanism of Figure 10 returning to the locked state;

Figure 12 shows a partially schematic view of the switching mechanism of Figure 5 unfolded along a circumferential direction;

Figure 13 shows a view similar to Figure 12, corresponding to Figure 6;

Figure 14 shows a view similar to Figure 12, corresponding to Figure 7;

Figure 15 shows a view similar to Figure 12, corresponding to Figure 8;

Figure 16 shows a view similar to Figure 12, corresponding to Figure 9;

Figure 17 shows a view similar to Figure 12, corresponding to Figure 10;

Figure 18 shows a view similar to Figure 12, corresponding to Figure 11;

Figure 19 shows a schematic view of a second embodiment of the switching mechanism according to the present invention.

EMBODIMENTS

Figure 1 shows a schematic perspective view of the seat belt buckle 1 according to the present invention. Figure 2 shows an exploded view of the seat belt buckle 1 in Figure 1. As can be seen from Figures 1 and 2, the seat belt buckle 1 comprises a buckle head 2 and a housing held in the vehicle, wherein the housing is not shown. The seat belt buckle 1 further comprises a feeding means for moving the buckle head 2 along a feeding direction X1 and a retracting direction X2 (see Figure 3) .

Figure 3 shows an enlarged detail view of the feeding means according to the present invention. The feeding means includes a cylindrical buckle connector 3, which is connected to the buckle head 2, preferably to an end of the buckle head. For example, a hole is centrally provided on the buckle connector 3, and the buckle head 2 is clamped in the hole by means of a steel wire 12. Further, the feeding means is also provided with a switching mechanism for switching the buckle head 2 between a locked state and an unlocked state, a rack 4 preferably fixedly connected to the buckle connector 3 for example by means of a threaded member, as well as a motor 6 operatively connected with the rack for example by means of a first gear 5 and/or a second gear 11. The motor 6 is configured to move the rack 4 linearly so as to be able to drive the buckle connector 3 along with the buckle head 2 to move along the feeding direction X1 and the retracting direction X2. Preferably, the rack 4 is integrally formed on the buckle connector 3.

In addition, it can also be seen from Figure 3 that, the switching mechanism has a depression member 7, a guide member 8, a swivel member 9 and a preloading member 10. In the current embodiment, the depressing member 7, the guide member 8, the swivel member 9 and the preloading member 10 are all arranged coaxially with the buckle connector 3. The depressing member 7 is disposed on the buckle connector 3, and the guide member 8 is disposed on the housing and is hereby configured to be able to be ran through by the buckle connector 3 together with the depressing member 7. A plurality of first runners 81 and a plurality of first protruding ribs 82 are alternately provided in a circumferential direction of the guide member 8 and the plurality of first protruding ribs 82 are respectively provided with a first tooth 83 at an end proximate to the swivel member 9. Corresponding to the guide member 8, a plurality of second runners 91 and a plurality of second protruding ribs 92 are alternately provided in a circumferential direction of the swivel member 9, and the plurality of second protruding ribs 92 are respectively provided with a second tooth 93 at an end proximate to the guide member 8, and the swivel member 9 is sleeved on the buckle connector in a manner of being rotatable about an axis of the buckle connector 3 and being movable along the axis of the buckle connector. The preloading member 10 is designed to preload the swivel member 9 towards the guide member 8.

In the current embodiment, the depressing member 4 is integrally formed on the buckle connector 3. It is self-evident that, the depressing member 4 may also be mounted on the buckle connector 3 in a detachable manner, for example by means of a threaded connector.

In the current embodiment, the preloading member 10 and the swivel member 9 have mutually repelling magnetic properties, thereby generating a preload. Certainly, it is also conceivable that, the preloading member 10 is an elastic member and is always in contact with the swivel member 9.

In the locked state, the second tooth 93 is engaged with a first tooth 83 under the action of the preloading member 10. In the unlocked state, the second protruding ribs 92 are slidable in the respective first runners 81 and at the same time the second runners 91 can be slidden through by the respective first protruding ribs 82. The depressing member 7 cooperates with the preloading member 10 in operation in such a way that the buckle head 2 is switched between a locked state and an unlocked state.

The operation principles of the switching mechanism are explained in more detail below with the aid of Figures 4 to 18.

Figure 4 shows a schematic view of a first embodiment of the switching mechanism according to the present invention, in which the depressing member and the preloading member are omitted. Each first tooth 83 respectively includes a first ramp 831, a first vertical surface 832 and a second ramp 833, and the first ramp and the second ramp having the same direction and size in slope. The first ramp 831 extends towards a direction away from the guide member 8 from a first edge of the first tooth 83 until intersecting with one end of the first vertical surface 832, the interface of the first ramp 831 and the first vertical surface 832 constitutes the first critical point A, the second ramp 833 extends towards the guide member 8 from a second edge of the first tooth 83 until intersecting with the other end of the first vertical surface 832, the second edge of the first tooth 83 constitutes the second critical point B and the first vertical surface 832 together with the second ramp 833 forms a groove, while the second tooth 93 has a shape complementary to the groove so that the second tooth 93 is engaged in the groove under the action of the preloading member 10 in the locked state.

Figures 5 to 18 elaborate the operation principles of the switching mechanism with the first embodiment of Figure 4 as an example. In these drawings, the depressing member 7 is shown by a dotted line, because the outer diameter of the depressing member is less than the inside diameter of the guide member in the present embodiment. In other words, the depressing member can fully move through the guide member. In addition, in the embodiment, the depressing member 7 has a third tooth 73 on an end proximate to the swivel member 9. Figures 12 to 18 only schematically show respective two protruding ribs and respective one runner of the guide member 8 and the swivel member 9 respectively.

Figure 5 shows a schematic view of the switching mechanism of Figure 4 in a locked state, in which the depressing member is not in contact with the swivel member. Figure 12 shows a partially schematic view of the switching mechanism of Figure 5 unfolded along a circumferential direction. It can be clearly seen from Figures 5 and 12 that, the second tooth 93 is engaged in the groove formed by the first vertical surface 832 and the second ramp 833 under the magnetic force of the preloading member 10, and at this time the feeding function of the seat belt buckle 1 has not been activated yet.

When the feeding function is activated, for example when it is detected that there is a person in the co-driver’s seat, it is first necessary to unlock the seat belt buckle 1. Now, the motor 6 is first driven to rotate reversely, so that the depressing member 7 is driven to move downward by the first gear 5, the second gear 11 and the rack 4 until the third tooth 73 is in contact with the second tooth 93. See Figures 6 and 13. Next, the motor 6 continues to rotate reversely, and the third tooth 73 and the second tooth 93 are always in contact under the magnetic force of the preloading member 10. The depressing member 7 drives the swivel member 9 to move away from the guide member 8 under the action of the rack 4 until the first critical point A of the guide member 8 is crossed by the second tooth 93 of the swivel member 9. At this time, the seat belt buckle 1 is unlocked. See Figures 7 and 14.

Then, the feeding process starts, that is, the motor 6 is driven to rotate forward, so that the depressing member 7 is driven to move upward by the first gear 5, the second gear 11 and the rack 4. In the forward rotation of the motor, the ramp of the second tooth 93 first contacts with the first ramp 831 of the respective first tooth 83, and at this time the depressing member 7 continues to move upward away from the swivel member 9 under the action of the rack 4. The second tooth 93 of the swivel member 9 slides over the first tooth 83 into the respective first runner 81 under the magnetic force of the preloading member 10 so that every second protruding rib 92 of the swivel member 9 can be guided in the respective first runners 81 of the guide member 8. See Figures 8 and 15. When the second tooth 93 of the swivel member 9 completely slides over the first tooth 83, the second tooth 93 is again kept in contact with the third tooth 73 of the depressing member 7 under the magnetic force of the preloading member 10.

Next, the motor 6 continues to rotate forward until a maximum feeding stroke is reached. See Figures 9 and 16. When it is detected that the buckle head has been inserted by the lock tongue, the buckle head starts to be retracted. At this time, the motor 6 is driven to rotate reversely, so that the depressing member 7 is driven to move downward by the first gear 5, the second gear 11 and the rack 4. As the second tooth 93 is kept in contact with the third tooth 73 of the depressing member 7 under the magnetic force of the preloading member 10 at this time, the swivel member 9 also moves downward in the first runner 81 at the same time, until the second critical point B of the guide member 8 is crossed by the second tooth 93 of the swivel member 9 and the second tooth 93 is first engaged into the third tooth 73 of the depressing member 7 under the magnetic force of the preloading member 10. See Figures 10 and 17. Then, in order to lock the buckle head 2, the motor 6 is again driven to rotate forward so as to drive the depressing member 7 to move upwards until the ramp of the second tooth 93 contacts with the second ramp 833 of the respective first tooth 83 and the second tooth 93 is disengaged from the third tooth 73 of the depressing member 7. Next, the second tooth 93 is engaged into the respective first tooth 83 under the magnetic force of the preloading member 10, so as to lock the buckle head 2. See Figure 11 and 18.

Figure 19 shows a schematic view of a second embodiment of the switching mechanism according to the present invention, in which the depressing member and the preloading member are also omitted. The second tooth 93 respectively includes a third ramp 931, a second vertical surface 932 and a fourth ramp 933, the third ramp and the fourth ramp having the same direction and size in slope, wherein the third ramp extends towards a direction away from the swivel member 9 from a first edge of the second tooth until intersecting with one end of the second vertical surface 932, the interface of the third ramp 931 and the second vertical surface 932 constitutes the first critical point A, the fourth ramp 933 extends towards the swivel member 9 from a second edge of the second tooth 93 until intersecting with the other end of the second vertical surface 932, the second edge of the second tooth 93 constitutes the second critical point B and the second vertical surface 932 together with the fourth ramp 933 forms a groove, while the first tooth 83 has a shape complementary to the groove so that the first tooth 83 is engaged in the groove under the action of the preloading member 10 in the locked state.

The above-mentioned features may all be arbitrarily combined with each other as long as they are meaningful within the scope of the present invention.

Although specific embodiments of the present invention have been described above, it should be understood by those skilled in the art that these embodiments are merely illustrative. Those skilled in the art may make multiple changes or modifications to these specific embodiments on the premise of not departing from the principles of the present invention, and all such changes and modifications fall into the protection scope of the present invention.

Claims

Seat belt buckle (1) for a vehicle seat belt system, comprising a buckle head (2) and a housing held in the vehicle, characterized in that:

the seat belt buckle further comprises a feeding means for moving the buckle head (2) along a feeding direction (X1) and a retracting direction (X2) , the feeding means including a cylindrical buckle connector (3) connected to the buckle head (2) , a switching mechanism for switching the buckle head (2) between a locked state and an unlocked state, a rack (4) connected to the buckle connector (3) and a motor (6) operatively connected with the rack, wherein the motor (6) is configured to move the rack (4) linearly so as to be able to drive the buckle connector (3) along with the buckle head (2) to move along the feeding direction and the retracting direction,

wherein, the switching mechanism has a depressing member (7) , a guide member (8) , a swivel member, and a preloading member (10) , wherein the depressing member (7) is disposed on the buckle connector (3) , the guide member (8) is disposed on the housing and configured to be able to be ran through by the buckle connector (3) together with the depressing member (7) , a plurality of first runners (81) and a plurality of first protruding ribs (82) are alternately provided in a circumferential direction of the guide member (8) and the plurality of first protruding ribs (82) are respectively provided with a first tooth (83) at an end proximate to the swivel member (9) , a plurality of second runners (91) and a plurality of second protruding ribs (92) are alternately provided in a circumferential direction of the swivel member (9) , and the plurality of second protruding ribs (92) are respectively provided with a second tooth (93) at an end proximate to the guide member (8) , the swivel member (9) is sleeved on the buckle connector in a manner of being rotatable about an axis of the buckle connector (3) and being movable along the axis of the buckle connector, and the preloading member (10) is configured for preloading the swivel member (9) towards the guide member (8) ,

wherein, the depressing member (7) is configured for cooperating with the preloading member (10) in operation such that the buckle head (2) is switched between a locked state, in which the second tooth (93) is engaged with a respective first tooth (83) under the action of the preloading member (10) , and an unlocked state, in which the second protruding ribs (92) are slidable in the respective first runners (81) and at the same time the second runners (91) can be slidden through by the respective first protruding ribs (82) .
The seat belt buckle (1) according to claim 1, characterized in that, the switching mechanism is configured for switching the buckle head (2) from the locked state to the unlocked state in the following manner: the depressing member (7) is moved towards the swivel member (9) until the depressing member is in contact with the second tooth (93) under the action of the rack (4) driven by the motor (6) , so as to drive the swivel member (9) to move away from the guide member (8) , until a first critical point (A) of the guide member (8) is crossed by the second tooth (93) of the swivel member (9) or a first critical point (A) of the swivel member (9) is crossed by the first tooth (83) of the guide member (8) , such that the second protruding ribs (92) enter the respective first runners (81) under the action of the preloading member (10) .
The seat belt buckle (2) according to claim 1, characterized in that, the switching mechanism is configured for switching the buckle head (2) from the unlocked state to the locked state in the following manner: the depressing member (7) is moved towards the swivel member (9) until the depressing member is in contact with the second tooth (93) under the action of the rack (4) driven by the motor (6) , so as to drive the second protruding ribs (92) of the swivel member (9) to move in the respective first runners (81) , until a second critical point (B) of the guide member (8) is crossed by the second tooth (93) of the swivel member (9) or a second critical point (B) of the swivel member (9) is crossed by the first tooth (83) of the guide member (8) , such that the second tooth (93) swivels and is engaged into the respective first tooth (83) under the action of the preloading member (10) .
The seat belt buckle (1) according to any one of claims 1 to 3, characterized in that, the first tooth (83) respectively includes a first ramp (831) , a first vertical surface (832) and a second ramp (833) , the first ramp and the second ramp having the same direction and size in slope, wherein the first ramp (831) extends towards a direction away from the guide member (8) from a first edge of the first tooth (83) until intersecting with one end of the first vertical surface (832) , the interface of the first ramp (831) and the first vertical surface (832) constitutes the first critical point (A) , the second ramp (833) extends towards the guide member (8) from a second edge of the first tooth (83) until intersecting with the other end of the first vertical surface (832) , the second edge of the first tooth (83) constitutes the second critical point (B) and the first vertical surface (832) together with the second ramp (833) forms a groove, while the second tooth (93) has a shape complementary to the groove so that the second tooth (93) is engaged in the respective groove under the action of the preloading member (10) in the locked state; or

The second tooth (93) respectively includes a third ramp (931) , a second vertical surface (932) and a fourth ramp (933) , the third ramp and the fourth ramp having the same direction and size in slope, wherein the third ramp (931) extends towards a direction away from the swivel member (9) from a first edge of the second tooth (93) until intersecting with one end of the second vertical surface (932) , the interface of the third ramp (931) and the second vertical surface (932) constitutes the first critical point (A) , the fourth ramp (933) extends towards the swivel member (9) from a second edge of the second tooth (93) until intersecting with the other end of the second vertical surface (932) , the second edge of the second tooth (93) constitutes the second critical point (B) and the second vertical surface (932) together with the fourth ramp (933) forms a groove, while the first tooth (83) has a shape complementary to the groove so that the first tooth (83) is engaged in the respective groove under the action of the preloading member (10) in the locked state.
The seat belt buckle (1) according to any one of claims 1 to 4, characterized in that, at least one of the depressing member (7) , the guide member (8) , the swivel member (9) and the preloading member (10) is arranged coaxially with the buckle connector (3) , wherein preferably the preloading member (10) is fixedly socketed in the buckle connector (3) .
The seat belt buckle (1) according to any one of claims 1 to 5, characterized in that, the seat belt buckle (1) has an electrical means for identifying whether the buckle head (2) is inserted by a seat belt lock tongue.
The seat belt buckle (1) according to any one of claims 1 to 6, characterized in that, the motor (6) is operatively connected to the rack (4) through a first gear (5) , wherein preferably a second gear (11) is further provided between the first gear (5) and the rack (4) .
The seat belt buckle (1) according to any one of claims 1 to 7, characterized in that, the preloading member (10) and the swivel member (9) have mutually repelling magnetic properties, thereby generating a preload, or the preloading member (10) is an elastic member and is always in contact with the swivel member (9) .
The seat belt buckle (1) according to any one of claims 1 to 8, characterized in that, the depressing member (7) is integrally formed on the buckle connector (3) , or the depressing member (7) is detachably or non-detachably mounted on the buckle connector (3) ; and/or

the rack (4) is integrally formed on an end of the buckle connector (3) , or the rack (4) is detachably or non-detachably mounted on an end of the buckle connector (3) .
The seat belt buckle (1) according to any one of claims 1 to 9, characterized in that, a hole is centrally configured on the buckle connector (3) , and the buckle head (2) is clamped in the hole by means of a steel wire (12) ; or

a steel wire (12) is integrally formed on one end of the buckle connector (3) , and the steel wire is connected to the buckle head (2) .
Vehicle, characterized in that, the vehicle has the seat belt buckle (1) according to any one of claims 1 to 10.