KR101366609B1 - Multi-functional buckle device for seat belt - Google Patents

Abstract

According to the present invention, the seat belt of the vehicle occupant is more conveniently made through the buckle lift function and the tension adjustment function, and the safety of the occupant is increased in the event of a collision by increasing the binding force on the occupant's body through the pretension function in the event of a crash. It is to provide a multifunctional seat belt buckle device for further improvement.
To this end, the present invention, the housing; A drive motor fixed to one end of the housing; A lead screw which is rotated in place in the housing by receiving power of the driving motor; A moving nut moving along the axial direction of the lead screw when the lead screw rotates in place; A collet installed to be movable along the axial direction together with the movable nut; A core installed inside the collet to move together with the collet during the axial movement of the movable nut, the core being restrained by interference with the collet when a pulling force is applied from the buckle side without the movement of the movable nut; One end is coupled to the core and the other end is coupled to the buckle is a wire to move the buckle according to the movement of the moving nut; seat belt buckle device is provided comprising a.

Description

Multi-functional buckle device for seat belt

The present invention relates to a buckle device of the seat belt, and more particularly, to make the seat belt of the vehicle occupant more convenient through the buckle lift function and the tension adjustment function, and also the pretension function in the event of a crash. The present invention relates to a buckle device of a multifunctional seat belt that increases the binding force to the body to further improve the safety of the occupant in the event of a vehicle crash.

In general, a seat belt of a vehicle is a kind of safety device that protects the occupant in the event of a vehicle crash, and can be worn by extending one tongue and fastening it to the opposite buckle.

The seat belt primarily serves to protect the occupant from the risk of serious injury by primarily catching the driver's and front passenger's body jumping forward in the event of a vehicle crash.

However, if the external force applied during the front collision is large, the occupant is pushed forward by a large force due to the inertia, even if the occupant is wearing the seat belt and supported by the seat belt, it is pushed by a certain distance.

Accordingly, a pretensioner is installed to prevent tension of the driver and other occupants by temporarily winding the seat belt in the event of a frontal collision and a collision accident, thereby improving the tension applied to the seat belt. In other words, the pretensioner is a device that reduces the injuries that passengers may suffer by locking in a greater tension in advance before the body of the occupant is forward.

Conventionally, a technique of applying a pretension function to a seat belt or a buckle using the explosive power of gunpowder has been proposed, but such a conventional technique is not only a disadvantage that cannot be reused due to the use of gunpowder, but also a problem that threatens the safety of passengers in case of malfunction. There is, in particular, because it is not so excellent in terms of the situation is not receiving much attention.

In addition to using the explosive force of the gunpowder, there are also pretension seat belts and buckles that use compressed air or compressed gas. However, these conventional pretension seat belts and buckles have a complicated structure and a high manufacturing cost. It is being applied and not popularized.

Meanwhile, when the tongue of the seat belt is fastened to the buckle, passengers can easily wear the seat belt only when the buckle is protruded high. However, as the utility of the console box is increasing, the height of the console box is increased. As a result, the protruding length of the buckle is shortened, which is inconvenient for passengers to wear seat belts.

As a way to solve this problem, there is a technique for moving the buckle to a position where the seat belt can be easily fastened to the tongue when the seat belt is worn (or buckle lift technology), but this is also structurally complicated. Due to the high manufacturing cost, it is only applied to some high-end cars and is not popularized.

Accordingly, the development of a safety device that is effective in the popularization of high-end specifications related to convenience and safety, such as a buckle lift function, a seat belt tension control function, and a pretension in a vehicle crash, while having a low manufacturing cost due to its simple structure.

In other words, the structure is simple, the manufacturing cost is low, and it is effective for popularization, but it is not only possible to lift the buckle, but also the tension of the seat belt can be adjusted accordingly to the occupant. There is an urgent need to develop a new safety device to prevent the occupant's body from tipping forward and hitting the interior parts of the vehicle.

Republic of Korea Patent Publication 10-0456572 (November 01, 2004) Republic of Korea Patent Application Publication No. 10-2013-0062145 (June 12, 2013) Republic of Korea Patent Publication No. 10-0398097 (September 01, 2003)

The present invention has been made in view of the above-mentioned problems and current circumstances, and the occupant through the pre-tension function in the event of a crash in addition to making the seat belt of the vehicle occupant more convenient through the buckle lift function and the tension adjustment function The purpose of the present invention is to provide a multifunctional seat belt buckle device that can further enhance the safety of the occupant in the event of a vehicle crash by increasing the binding force on the body.

The present invention to achieve the above object, the housing; A drive motor fixed to one end of the housing; A lead screw which is rotated in place in the housing by receiving power of the driving motor; A moving nut moving along the axial direction of the lead screw when the lead screw rotates in place; A collet installed to be movable along the axial direction together with the movable nut; A core installed inside the collet to move together with the collet during the axial movement of the movable nut, the core being restrained by interference with the collet when a pulling force is applied from the buckle side without the movement of the movable nut; One end is coupled to the core and the other end is coupled to the buckle to the wire to move the buckle in accordance with the movement of the moving nut; seat belt buckle device is provided comprising a.

The effect of the buckle device of the seat belt according to the invention is as follows.

First, according to the present invention, the seat belt wearing of the vehicle occupant is made more convenient.

That is, when the seat belt is worn, the buckle moves to a position where the fastening with the tongue is easy, and when the fastening is completed, the seat belt's tension can be adjusted to suit the occupant, thereby improving the wearability of the seat belt.

Next, according to the present invention, when the front collision of the vehicle occurs, the pretension function is activated to increase the body restraint for the occupant to further improve the safety of the occupant.

On the other hand, according to the present invention, the structure is very simple and easy to manufacture, the manufacturing cost is low, high-end specifications related to ensuring safety by applying the safety-related high-end specifications that were limited to some expensive luxury cars applied to low-end models Can contribute to popularization.

1 is a perspective view showing a state in which the buckle device of the seat belt according to the invention is applied to the seat side of the vehicle.
FIG. 2 is an external perspective view of the buckle device of the seat belt of FIG. 1. FIG.
FIG. 3 is an exploded perspective view of FIG. 2. FIG.
FIG. 4 is an exploded perspective view of the component of FIG. 2 in cross section.
5 is a cross-sectional view showing a coupling state of FIG.
6a to 6c are for explaining the buckle lift action of the seat belt buckle device according to the present invention,
6A is a state diagram before the buckle lift,
6B is a state diagram after the buckle lift,
6C is a state diagram after the buckle is in place.
7a to 7c are for explaining the pretension function of the seat belt buckle device according to the present invention,
7A is a state diagram immediately before a vehicle crash,
7B is a state diagram of pretension operation immediately after vehicle collision detection;
7C is a state diagram immediately after the core performs the wedge action.
Figure 8 is a cross-sectional view showing another embodiment of the seat belt buckle device of the present invention.
9a to 9c are for explaining the buckle lift action of the seat belt buckle device of FIG.
9A is a state diagram before the buckle lift,
9B is a state diagram after the buckle lift,
9C is a state diagram in which the buckle is in the original position.
10a to 10c are for explaining the pretension function of the seat belt buckle device according to the present invention,
10A is a state diagram immediately before a vehicle crash,
10B is a state diagram of pretension operation immediately after vehicle collision detection;
10C is a state diagram immediately after the core performs the wedge action.
11A to 11G are perspective views showing respective components of the seat belt buckle device of the present invention individually;
11A is a perspective view of a ring bracket,
11B is a perspective view of a lead screw,
11c is a perspective view of a moving nut,
11D is a perspective view of the housing,
11E is a perspective view of the collet,
11F is a perspective view of the core and
11G is a perspective view of a stop ring applied to a second embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 1 to 11G.

[Example 1]

First, the seat belt buckle device according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 11F.

1 to 7C, the vehicle seat belt buckle device B includes a cylindrical housing 1; A drive motor 2 fixed to one end of the housing 1; A lead screw (3) which receives power from the driving motor (2) and rotates in place in the housing (1); A moving nut (4) moving along the axial direction of the lead screw (3) when the lead screw (3) rotates in place; A collet (5; collet) installed to be movable along the axial direction together with the movable nut (4); A core 6 installed in the collet 5 to perform a pre-tention function; One end is coupled to the core (6) and the other end is coupled to the buckle (8) to move the buckle (8) in accordance with the movement of the moving nut (4); comprises a.

In this case, the housing 1 may be fixed to the vehicle body, or may be installed on the side or the rear of the occupant seat (S).

The moving nut 4 is screwed to the lead screw (3) to minimize the rotation of the lead screw (3) in accordance with the drive of the drive motor 2, the forward and backward of the moving nut (4) It is desirable to make this more smooth.

That is, since most of the inner space of the movable nut 4 is empty, friction with the lead screw 3 is minimized, and the weight of the movable nut 4 is also minimized, so that the moving nut 4 can be moved forward and backward more easily. It is configured to lose.

On the other hand, the buckle-side end of the moving nut 4 is in contact with the core 6, it is configured to push the core 6 when moving the moving nut 4 in the same direction.

The core 6 is installed inside the collet 5 to move together with the collet 5 during the axial movement of the movable nut 4 to perform the buckle lift function, and the buckle 8 side by the collision of the vehicle. The collet 5 is configured to be constrained to the inner wall of the housing 1 by the interference with the collet 5 when a sudden pulling force is applied.

In the axial movement of the moving nut 4, the movement toward the buckle 8 side (i.e., forward) or the drive motor 2 side (i.e., backward) according to the rotational direction of the lead screw 3 is performed. Divided into

In addition, the collet 5 is preferably threaded 401 at one end of the movable nut 4, and is preferably fastened by screwing. However, the collet 5 and the movable nut 4 are fastened by a screw. It is not limited to the combination.

In addition, the collet 5 has a split groove 501 in the longitudinal direction so that the diameter of the collet 5 can be increased, and the inner diameter gradually increases toward the buckle 8 in the section in which the split groove 501 of the collet 5 is formed. A reducing area is provided. In addition, since the inner end surface of the buckle 8 side of the collet 5 is tapered and configured to become thicker toward the buckle 8 side, the inner diameter reduction portion I gradually decreasing in diameter; 4).

On the other hand, the core 6 includes a region in which the outer diameter is reduced corresponding to the region in which the inner diameter of the collet 5 gradually decreases. That is, the core 6 has an outer diameter reducing portion O (see FIG. 11F) corresponding to the inner diameter reducing portion I of the collet 5.

In addition, a wire insertion hole 601 is formed at an axial center of the core 6, and a wire inserted through the wire insertion hole 601 when the fastening member 61 is fastened on an outer circumferential surface of the core 6. A wire fastening hole 602 is formed in which the fastening member 61 is crimped and fixed.

Here, the wire fastening hole 602 is preferably formed in an area where the outer diameter does not change, not an area in which the outer diameter of the core 6 is reduced, but is not necessarily limited thereto. That is, it is preferable to form the wire fastening hole 602 in the region where the outer diameter of the core 6 does not change, but it is also possible to form the wire fastening hole in the area where the outer diameter is reduced.

And, between the housing (1) and the drive motor (2), while connecting the housing (1) and the drive motor (2) ring bracket for transmitting the power of the drive motor (2) to the lead screw ( 9) is preferably provided.

To this end, the ring bracket 9 has a screw through hole 901 through which the lead screw 3 penetrates in the center of the surface, and a ring bracket on the driving motor 2 on the surface near the screw through hole 901. A screw fastening hole 902 for fastening (9) is formed, and a thread 903 for screwing to one end of the housing 1 is formed on the outer circumferential surface of the ring bracket 9.

On the other hand, the lead screw 3 is formed with a shaft coupling groove 301 is coupled to the motor shaft 201 of the drive motor (2).

The other end of the housing 1 is provided with a wire guide 12 coupled to the other end of the housing 1 to guide and support the movement of the wire 7. As the wire guide 12 has a curved portion in the form of a tube, the wire guide 12 serves to change the traveling direction of the wire 7.

In addition, the wire 7 may have elasticity that may return to a straight line shape when the external force is removed in a curved state while securing sufficient tensile strength to perform a pretension function, for example, as a metal material such as iron wire. It is preferably formed to have, but sufficient tensile strength to be able to perform the pretension function is secured and can be replaced with other materials as long as it has elasticity.

On the other hand, the outer surface of the housing (1) is formed in the long groove 101 in the axial direction, the outer surface of the movable nut (4) located in the housing (1) is located in the long groove (101) in the moving nut (4) It is preferable that a guide protrusion 411 is provided to help linear movement. That is, when the lead screw 3 rotates together with the lead screw 3 when the lead screw 3 is rotated by the driving motor 2, the forward and backward movement of the move nut 4 is not performed. The nut 4 is prevented from rotating together with the lead screw 3 so that the moving nut 4 can be secured forward and backward.

The guide protrusion 411 may be manufactured in a form having a screw thread at the lower end for assembling the housing 1 and the movable nut 4. That is, the threaded portion of the guide protrusion 411 may be fastened and fixed to the guide protrusion assembly hole 402 formed in the movable nut 4 in a state in which the moving nut 4 is inserted into the housing 1.

Then, on the outer surface of the collet 5 and the inner surface of the housing 1, a force to move the core 6 to the buckle side by a sudden pulling force transmitted to the core 6 through the wire 7 during the vehicle collision. When the inclined surface of the core 6 momentarily exerts a force to extend the inner diameter reducing portion (I) of the collet outwards, the outer surface of the collet (5) is enlarged as the collet (5) is expanded 1) Serrations 503 and 103 are formed to engage the inner surface.

At this time, the serrations 503 and 103 are preferably formed in a toothed structure in which the movement of the core 6 can be directly restrained when the engagement is made. That is, referring to the enlarged portion of FIG. 5, in the tooth structure, the serrations 503 and 103 formed in the collet 5 and the housing 1 may be formed in the radial direction at the time of mating according to the diameter of the collet 5. It is preferable that the movement of the collet 5 is immediately constrained by the interference between these line teeth.

The operation of the seat belt buckle device (B) according to the first embodiment of the present invention configured as described above is as follows.

The seat belt buckle device (B) of the present invention performs three functions largely, and after the buckle 8 is moved to a position where the seat belt (not shown) can be easily worn, the wear is completed again. Inverted buckle lift function, seat belt tension adjustment function to adjust seat belt tension properly to occupant through seat belt adjustment after the seat belt is worn, and drive when an abnormality is detected by vehicle collision The tension of the seat belt is improved by pulling the buckle 8 toward the driving motor 2 side (that is, backward) through the driving of the motor 2 to perform a pretension function to prevent the occupant from pushing. Done.

The three functions mentioned above and the process of performing the functions are explained in order as follows.

1. [Buckle lift function]

First, referring to the buckle lift function, when the buckle lift function is selected and the power is supplied to the driving motor 2, the moving nut 4 and the moving nut 4 are coupled to each other by driving of the driving motor 2. Collet 5, the core 6 disposed inside the collet 5, the wire 7 connected to the core 6 is moved to the right (ie buckle side) in the state shown in Figure 6a As a result, the buckle 8 is switched to the lift state moved by the distance 'd1' as shown in FIG. 6B.

That is, when the lead screw 3 is rotated forward by the drive of the drive motor 2, the moving nut 4 coupled to the lead screw 3 is advanced along the axial direction of the lead screw 3, Accordingly, the collet 5 fastened to the movable nut 4 is also advanced, and the core 6 installed in the collet 5 is also pushed by the pushing force of the movable nut 4 having the end contacted thereto. ), And thus the wire 7 coupled to the core 6 is also advanced so that the buckle 8 coupled to the tip of the wire 7 guided by the wire guide 12 is fastened with the tongue. It will rise to this easy position.

In the lifted state as described above, the occupant can be easily fastened with the tongues provided in the buckle 8 and the seat belt, and after the fastening of the tongue and the buckle 8 is completed, the driving motor 2 is driven. The lead screw 3 reverses.

Accordingly, the moving nut 4 coupled to the lead screw 3 retreats along the axial direction of the lead screw 3, and thus the collet 5 fastened to the moving nut 4 also retreats. In addition, the core 6 installed inside the collet 5 also moves backward due to the interference of the collet 5.

 Therefore, the wire 7 coupled to the core 6 is also reversed. At this time, as the movement distance of the wire 7 is controlled to return to the position before the buckle lift function, the buckle 8 coupled to the tip of the wire 7 is controlled. ) Is returned to the state before the buckle lift (see Fig. 6c).

On the other hand, upon retraction of the movable nut 4 for the original position of the buckle 8, the collet 5 of the present embodiment is made to have sufficient rigidity, so that it is in close contact with the inner surface of the housing 1 by interference with the core 6. This prevents the phenomenon of moving.

That is, the collet 5 of the present embodiment is designed to have sufficient rigidity, so that when performing the [buckle lift function] and the [seat belt tension adjustment function] to be described later, except when the [pretension function] to be described below is made. The phenomenon that the buckle 8 does not move due to interference with the inner surface of the housing 1 does not occur.

In the above, the buckle (8) is preferably controlled to rise within 50 ~ 100mm, may be controlled to go back to the original position immediately after the buckle (8) and the tongue is jointed, 5 to 10 seconds without the original position It is desirable to be controlled to return to the home position after the delay.

For the reason of controlling the raised position of the buckle 8 to an appropriate range, if the buckle 8 is lifted to an excessively short distance of less than 50 mm, the wearing of the seat belt may still be inconvenient, and the buckle lift function may be meaningless. This is because the buckle 8 is twisted downward when it rises to an excessively high position, making wearing of the seat belt uncomfortable.

On the other hand, after the buckle 8 and the tongue have been jointed, the reason why the time delay is kept in the proper range until the buckle 8 returns to the original position is that the seat belt is brought back when the buckle 8 returns to the original position with too short time delay. This is because wearing is accompanied by inconvenience, and after too long time delay, the buckle 8 may return to the original position and may cause a safety problem for the occupant.

2. [Seat belt tension adjustment function]

Next, look at the seat belt tension adjustment function as follows.

The seat belt tension adjustment function refers to a function that allows the seat belt tension to be adjusted so that the seat belt tension is optimized for the occupant. Here, the seat belt tension adjustment function includes the tension of the seat belt can be further adjusted so that the seat belt tension is optimized for the occupant in addition to the above-mentioned buckle lift position of the buckle lift function.

Specifically, in the seat belt buckle device B of the present invention, the drive motor 2 is additionally controlled in consideration of the user's body in the state where the buckle 8 is in the original position before the lift, thereby the drive motor 2 As the lead screw 3 connected to the lead screw 3 rotates forward or reverse, the moving nut 4, the collet 5, and the core 6 interlocked with the lead screw 3 move, and thus the wire 7 connected to the core 6. The tension of the seat belt can be adjusted to fit the occupant's body by moving the buckle 8 forward or backward.

On the other hand, the seat belt tension adjustment function, as described above, may be performed separately after the completion of the buckle lift function is performed once the buckle (8) is in place and the subsequent process. That is, the seat belt tension adjustment function may be performed by a separate process from the original buckle (8) by the buckle lift function.

In other words, after the buckle 8 and the tongue has been fastened and the predetermined time has passed, the process of adjusting the seat belt tension is performed according to the body shape of the occupant, without the process of returning the buckle 8 to its original position. It can be.

3. [Pretension Function]

Next, the pretension function of the present invention will be described.

The pretension function refers to a function of preventing tension in the front of the occupant in the event of a vehicle collision by improving the tension acting on the wire 7 immediately when an accident such as a front collision of the vehicle occurs.

In the seat belt buckle device (B) according to the present invention, when an abnormality such as a front collision accident is detected, an abnormality detection signal is immediately transmitted to the driving motor 2 to move the buckle in the reverse direction.

That is, the control signal according to the abnormal detection is transmitted and at the same time the drive motor 2 is driven to move the moving nut 4 in the reverse direction (that is, the drive motor side), accordingly to the moving nut 4 The fastened collet 5 is also reversed, and the core 6 installed inside the collet 5 is also reversed by the pushing force of the interfered collet 5, and eventually the buckle 8 connected to the wire 7. In addition, the force in the reverse direction is transmitted to pull the seat belt in advance, thereby performing a pre-tention function to prevent the front of the occupant in the event of a vehicle crash.

For reference, the pretension function that is driven by the driving motor 2 by the control signal according to the abnormal detection is performed in a very short time, the state before the occupant's body is still forward until the pretension function is performed. to be.

In FIG. 7B, 'd2' denotes the moving nut 4 and the collet 5, the core 6, and the wires interlocked with the moving nut 4 while the driving motor 2 is driven by the control signal according to the abnormal detection. (7), the component such as the buckle (8) is the distance back.

Subsequently, as the occupant's body is moved forward while the pretension function is applied, a load is applied to the seat belt according to the occupant's leaning, and the load is applied to the core 6 through a wire 7 connected to the buckle 8. It acts as a rapid external force (ie, a pulling force) for the core, thereby causing the core 6 to interfere with the collet 5 during the movement of the short section (d3; see Fig. 7c), thereby The core 6 no longer moves within the housing 1 and is constrained.

That is, as the core 6 is restrained immediately after the movement of the short section, the wire 7 connected to the core 6 and the buckle 8 coupled to the tip of the core 6 are directly restrained together, thereby impacting the passengers. The tension is applied to the seat belt while maintaining the passengers will be held.

More specifically, according to the structure of the seat belt buckle device (B) of the present invention, the collet 5 has a split groove 501 in the longitudinal direction so that the diameter can be expanded, and in the section where the split groove 501 is formed A region in which the inner diameter gradually decreases toward the buckle 8 side is formed, and the core 6 is provided with a region in which the outer diameter decreases corresponding to the region in which the inner diameter of the collet 5 gradually decreases.

That is, in the section in which the split groove 501 of the collet 5 is formed, the area whose inner diameter gradually decreases toward the buckle 8 side becomes thicker as the thickness gradually increases toward the buckle side, so that the inner diameter gradually decreases.

Thus, with the pretension function activated, a rapid external force (ie a pulling force) is applied to the core 6 via a wire 7 connected to the buckle 8 as the body of the occupant is then pushed forward by inertia. The core 6 moving in a short section in the direction in which an external force is applied acts as a kind of wedge to expand the inner diameter reducing portion I in which the dividing groove 501 of the collet 5 is formed. Accordingly, the collet 5 is fixed to interfere with the inner peripheral surface of the housing (1).

In addition, as the collet 5 is fixed to the inner circumferential surface of the housing 1 as described above, the core 6 may be fixed with the inner diameter reducing portion 1 of the collet 5 even if the pulling force to the buckle side continues to act. It is bitten and fixed inside the collet 5 by interference.

On the other hand, among the three functions described above, the performance of the [buckle lift function] is a signal of the door sensor (not shown) is transmitted to the controller for controlling the vehicle electronically when the door is opened for the passenger to board the vehicle, It may be controlled to operate according to the control signal of the controller, or may be controlled to operate by turning on a separate operation switch in a state where the occupant sits on the seat (S).

It can also be controlled by vehicle speed. That is, when the speed of the vehicle is zero, the buckle 8 may always be maintained in a lifted state, and when the vehicle speed is not zero, the buckle 8 may be controlled to move down to its original position.

Seat belt buckle device (B) of the present invention that acts as described above will provide the following advantages.

First, when the seat belt is worn, the buckle 8 is lifted to facilitate fastening with the tongue, and after the fastening with the tongue is completed, the buckle 8 returns to its original position, thereby improving wearability of the seat belt.

In particular, by the subsequent control following the original position of the buckle 8 or by a separate control from the original position of the buckle 8, the seat belt's tension can be adjusted accordingly to the occupant, thereby ensuring safety as well as the seat belt. Can also be improved.

Meanwhile, according to the present invention, when the front collision of the vehicle occurs, the pretension function is activated, thereby improving the safety of the occupant by increasing the body restraint on the occupant of the seat belt.

In addition, since the seat belt buckle device (B) of the present invention is very simple in structure, not only is it easy to manufacture, but also manufacturing cost can be reduced.

Therefore, by applying the safety-related high-end specifications that were limited to some expensive luxury cars to low- and medium-priced cars can contribute to the popularization of high-end specifications related to securing safety.

[Example 2]

Next, the seat belt buckle device B according to the second embodiment of the present invention will be described with reference to FIGS. 8 to 11G.

Basically, the configuration and function of the seat belt buckle device (B) according to the present embodiment is the same as the seat belt buckle device according to the first embodiment of the present invention described above, [Buckle lift function] and [tension adjustment function] In practice, there is a difference in that a pressurizing means is further provided to move the core 6 in contact with the moving nut 4.

Therefore, the same structure and function of this embodiment are abbreviate | omitted, and it demonstrates focusing on the structure and effect | action of a pressurization means.

Seat belt buckle device (B) according to the present embodiment is further provided with a pressing means for acting to push the core 6 toward the moving nut (4) side.

The pressing means is supported by a stop ring 13 installed at the end of the buckle side where the split groove 501 of the collet 5 is formed, and the stop ring 13 to move the core 6. 4) includes an elastic member 14 pushed to the side.

The stop ring 13 is a 'C' shaped snap ring (see FIG. 11), and fits into a ring installation groove 502 formed on an inner surface of a buckle side end portion where the split groove 501 of the collet 5 is formed.

In this embodiment, the stop ring 13, which is a separate member, supports the elastic member 14. However, instead of installing the stop ring, the stop ring 13 has a radial direction at the end of the buckle side in which the split groove 501 of the collet 5 is formed. The support piece may be integrally protruded toward the inner side, so that the elastic member 14 is supported by the support piece.

As the elastic member 14, for example, a compression coil spring may be applied, but various members that perform other pressing actions may be applicable.

The seat belt buckle device B according to the second embodiment of the present invention configured as described above provides the following effects.

The seat belt buckle device B according to the present embodiment is pressurized to allow the core 6 to move forward and backward in contact with the moving nut 4 when the above-mentioned [buckle lift function] and [tension adjustment function] are performed. With the provision of means, the phenomenon in which the collet 5 is clamped on the inner surface of the housing 1 can be more effectively eliminated.

That is, in the above-described first embodiment, the collet 5 is clamped to the inner surface of the housing 1 during the forward and backward movement of the moving nut 4 according to the above-mentioned [buckle lift function] and [tension adjustment function]. In order to solve the possibility of occurrence of the phenomenon, it is necessary to secure the design strength of the collet 5 sufficiently, but according to the present embodiment, the design strength of the collet 5 can function normally in the structure according to the first embodiment described above. Although the collet 5 is clamped to the inner surface of the housing 1 in the process of performing the [buckle lift function] and [tension adjustment function] even if the design value is smaller than the design strength of the Since it is effectively prevented by the pressing action toward the moving motor 4 side, the [buckle lift function] and [tension adjustment function] can be performed smoothly.

Therefore, the seat belt buckle device B according to the present embodiment has an advantage of increasing the degree of freedom in designing the collet 5 having the split groove 501 so that the diameter can be increased.

On the other hand, the present invention is not limited to the above-described embodiments, and may be changed and modified in various forms without departing from the scope of the technical spirit of the present invention.

For example, the wire 7 in the above-described embodiment is an example of a connecting member for connecting the core 6 and the buckle 8, and means that the wire, which is the connecting member, is limited to the linear structure shown in the present embodiment. It is not.

In the above-described embodiment, when the collet 5 is enlarged on the outer surface of the collet 5 and the inner surface of the housing 1 while the core 6 is restricted, the collet 5 is engaged with the housing. The serrations 503 and 603 to be constrained to (1) have been described as an example, but are not necessarily limited thereto.

Because, when performing the [pretension function] according to the vehicle collision, the wedge of the core 6, even if the serrations 503 and 603 are not formed on the outer surface of the collet 5 and the inner surface of the housing 1 When the collet 5 is enlarged by the action, the collet 5 is clamped to the inner surface of the housing 1 by the frictional force between the collet 5 and the housing 1, so that the core 6 is also collet 5. Because it can be immediately restrained by interference with.

Therefore, the foregoing embodiments are to be considered as illustrative and not restrictive, and it is to be understood that the present invention is not limited to the above description but may be changed within the scope and equivalents of the appended claims. something to do.

The seat belt buckle device (B) of the present invention is a vehicle safety device of a new structure that provides a buckle lift function to the occupant, and also provides a pretension function in the event of a vehicle collision. As the unit price can be lowered, it can be effectively applied to the popularization of safety-related high-end specifications. Therefore, it is highly applicable to the automobile industry aiming at low cost and high specifications in the future.

B: Buckle Device 1: Housing
101: long groove 103: serration
2: drive motor 201: motor shaft
3: lead screw 301: shaft coupling groove
4: moving nut 401: thread of moving nut
402: guide protrusion assembly hole 411: guide protrusion
5: Collet 501: Split Groove
502: ring mounting groove 503 serration
6: core 601: wire insertion hole
602: wire fastening hole 61: fastening member
7: wire 8: buckle
9: ring bracket 901: screw through hole
902: screw fastening 903: thread of the ring bracket
12: Wire guide 13: Set ring
14: elastic member I: inner diameter reducing portion
O: outer diameter reducing portion S: sheet

Claims (14)

housing;
A driving motor fixed to one end of the housing;
A lead screw which is rotated in place in the housing by receiving power of the driving motor;
A moving nut moving along the axial direction of the lead screw when the lead screw rotates in place;
A collet installed to be movable along the axial direction together with the movable nut;
A core installed inside the collet to move together with the collet during the axial movement of the moving nut, the core being restrained by interference with the collet when a pulling force is applied from the buckle side in the absence of the moving nut;
And a wire having one end coupled to the core and the other end coupled to the buckle to move the buckle according to the movement of the moving nut. The method of claim 1,
The collet is a seat belt buckle device, characterized in that fastened by screwing to one end of the moving nut. The method of claim 1,
The buckle side end of the movable nut is in contact with the core, the seat belt buckle device, characterized in that configured to move in the same direction by pushing the core when the moving nut advances. The method of claim 1,
And the collet has a split groove in the longitudinal direction to enable diameter expansion. 5. The method according to any one of claims 1 to 4,
The collet has a seat belt buckle device characterized in that it has an area that gradually decreases the inner diameter toward the buckle side. The method of claim 5,
The core, the seat belt buckle device characterized in that it comprises a region in which the outer diameter is reduced corresponding to the area of the inner diameter of the collet gradually decreases. The method of claim 1,
Between the housing and the drive motor, the seat belt buckle device, characterized in that the ring bracket for connecting the housing and the drive motor to transfer the power of the drive motor to the lead screw is provided. The method of claim 1,
Seat belt buckle device, characterized in that the other end side of the housing is coupled to the other end of the housing is provided with a tubular wire guide for guiding and supporting the movement of the wire. 9. The method of claim 8,
The wire guide belt buckle device characterized in that it has a curved portion for changing the direction of travel of the wire. The method of claim 1,
Long grooves are formed on the outer surface of the housing in the axial direction,
Seat belt buckle device, characterized in that the outer surface of the moving nut is provided in the guide groove to help the movement nut to move in a straight line. The method of claim 1,
A wire insertion hole is formed at an axial center of the core, and a seat belt hole is formed on the outer circumferential surface of the core to form a wire fastening hole for crimping and fixing the wire inserted through the wire insertion hole when the fastening member is fastened. Buckle device. The method of claim 1,
Seat belt buckle device characterized in that the serration is formed on the outer surface of the collet and the inner surface of the housing is constrained to increase the frictional force between the diameter of the collet and the housing when the collet is enlarged, while restraining the movement of the core . The method of claim 1,
Seat belt buckle device characterized in that it is further provided with a pressing means for providing a force for pushing the core toward the moving nut. 14. The method of claim 13,
Wherein the pressing means comprises:
A stop ring installed at the buckle side end of the collet;
And an elastic member supported by the stop ring to push the core toward the moving nut.

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