KR100461311B1 - Retractor mechanism of automobile seat belt - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retractor device for an automobile seat belt having an ALR (Automatic Locking Retractor) function, comprising: a gear combination and a rack interlocked with rotation of a drum, a pivot bar pivoted by the rack, and the pivot bar. The electromagnet is operated by a switch that is ON, and the actuating lever is configured to restrict the rotation of the drum with respect to the webbing pull-out direction to switch to the ALR function, so that the ALR operation is more reliable with a relatively simple configuration. The present invention relates to a retractor device for an automobile seat belt that can be implemented in a state and improved to reduce the occurrence of malfunctions compared to a conventional complicated structure.

Description

Retractor mechanism of automobile seat belt

The present invention relates to a retractor device for an automobile seat belt having an ALR function, and more particularly, to a gear combination and a rack interlocked with a rotation of a drum, a pivoting bar pivoted by the rack, and to be turned on by the pivoting bar. The electromagnet is operated by the switch, and the actuating lever is configured to restrict the rotation of the drum with respect to the webbing pull-out direction to switch to the ALR function, so that a more reliable ALR operation state can be realized with a relatively simple configuration. The present invention relates to a retractor device for an automobile seat belt that is improved to reduce the occurrence of malfunctions compared to a conventional complicated structure.

In general, seat belts installed in a vehicle are configured to restrain the body of the seated person in the event of a vehicle collision to prevent secondary collisions and shocks while preventing the seated person from popping out of the vehicle body. The three-point seat belt is a combination of a belt and a waist belt.

Such seat belts, as is well known, have been proved to have high safety in crashing vehicles and are absolutely necessary for the safety of seat occupants. Recently, the seat belts have been installed so that the seat belts can be adjusted to an optimal restraint height according to physical conditions. In addition, other locking devices have been developed and installed that reduce the damage of passengers in the event of an accident and do not limit their activities.

On the other hand, among the components of the seat belt is a retractor is a device for winding the seat belt webbing, a built-in device for fixing the seat belt webbing when a sudden force is applied.

In such a device, the ball housed in the ball housing pushes the operating lever according to the vibration, acceleration, inclination, etc. of the vehicle body, and as the operating lever rotates, the pole is in the interference region of the reversal preventing teeth formed in the drum of the retractor. And locks the rotation of the drum with respect to the webbing pull-out direction (webbing release direction).

That is, the pawl locks the rotation of the drum to prevent loosening of the webbing to lock the seat belt. In addition, when the webbing is wound, the pawl may rotate while leaving the interference region of the reversal preventing teeth.

In addition, the seat belt made as described above is also used to install the baby seat in the vehicle, in this case there is a limit to restrain the baby seat completely restrained seat belt applied to the retractor locking the webbing only in an emergency.

Therefore, in the case of vehicles currently sold in North America, seat belts equipped with a convertible locking retractor (CLR) are installed. A retractor device configured to have both a Locking Retractor (hereinafter referred to as ALR) function and an Emergency Locking Retractor (ELR) function.

In the CLR, when the seat belt webbing is completely removed from the retractor, the webbing is rolled up and converted into an ALR function that cannot be withdrawn, and when the webbing is rewound to the retractor for a predetermined length or more, the webbing is freely taken out and retracted. Depending on the amount of acceleration that can be pulled out, the release / locking is converted to a controlled ELR function.

After all, in order to mount the infant seat using the seat belt adopting the CLR, the webbing should be completely released from the retractor, the CLR should be converted to the ALR state, and the infant seat should be installed in this ALR state. Since the baby sheet is continuously wound until it is restrained, but is not drawn out, the baby seat may be safely restrained.

In addition, in the CLR, when the baby seat is subsequently removed, the seat belt webbing is wound over a predetermined length and is automatically converted back to the ELR state.

However, in the conventional CLR made as described above, as shown in the accompanying FIG. 3, for the selective implementation of the ALR function by full webbing, the rotor 11 and a plurality of complicated gears 12 and 13, In addition, since the cam structure 14 is mechanically turned on / off, there is a problem that there is a high possibility of malfunction due to deformation due to impact or poor manufacturing due to the application of a complicated structure as illustrated.

Therefore, the present invention has been invented to solve the above problems, the electromagnet is provided by a gear combination and rack interlocked with the rotation of the drum, a rotating bar rotated by the rack, and a switch operated by the rotating bar. This enables the actuating lever to constrain the rotation of the drum with respect to the webbing pull-out direction to switch to the ALR function, enabling a more reliable implementation of the ALR operating state with a relatively simple configuration. It is an object of the present invention to provide a retractor device for an automobile seat belt that is improved to reduce the occurrence of malfunctions.

1 is a schematic view showing the configuration of a device for implementing the ALR function in the retractor device of the present invention,

2a and 2b is an operating state of Figure 1,

3 is a configuration diagram schematically showing a conventional CLR.

<Explanation of symbols for the main parts of the drawings>

20: drum 21: teeth for preventing reverse

22: ball housing 23: ball

24: operating lever 25: pole

31: electromagnet 32: connection rod

33: metal member 40: switch

41: fixed contact 42: movable contact

50: gear combination 51: small gear

52: wait 60: rack

70: rotation bar 71,72: locking portion

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

According to the present invention, the webbing is wound and the drum 20 having the teeth 21 for reversing prevention is rotated by the ball 23, so that one end of the pole 25 rotates the drum 20 with respect to the drawing direction of the webbing. In a retractor device for an automobile seat belt comprising an actuating lever 24 adapted to restrain,

Rotation of the drum 20 with respect to the drawing direction of the webbing can be constrained by the connecting rod 32 installed at the opposite end of the pawl 25 of the actuating lever 24 and the metal member 33 at its tip. An electromagnet (31) adapted to pivot the actuating lever (24); A switch 40 comprising a fixed contact 41 connected to the electromagnet 31 by a wire and a movable contact 42 grounded to the outside, and selectively applying power to the electromagnet 31; A gear combination 50 composed of gears 51 and 52 having a predetermined gear ratio and driven by the rotational force of the drum 20, and a rack 60 moving forward and backward by driving the gear combination 50; ; In accordance with the webbing operation is provided by the rotation bar 70 is rotated by the rack 60 forward or backward by a predetermined distance to open and close the movable contact 42 of the switch 40,

In accordance with the webbing operation, switching to the ELR or ALR state is characterized in that it is selectively made.

In particular, the rotation bar 70 has a locking portion (71, 72) protruding toward the rack (60) to be pushed in the state in which the rack 60 is moved forward or backward by a predetermined distance at both ends for the rotation of the rotation bar (70) It is characterized by.

In addition, the rack 60 pushes the locking portion 71 of one end of the rotation bar 70 so that the movable contact 42 of the switch 40 is closed when the webbing is completely pulled out for switching to the ALR state. Characterized in that it is intended to rotate.

In addition, the rack 60 is the other end of the rotation bar 70 so that the movable contact 42 of the switch 40 is opened when the webbing is wound around the drum 20 for a predetermined length or more for switching to the ELR state. It is characterized in that to push the locking portion 72 to rotate.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a schematic view showing the configuration of a device for implementing the ALR function in the retractor device of the present invention, Figures 2a and 2b is an operating state of Figure 1, Figure 2a is an ALR state, Figure 2b Shows the state converted from ALR state to ELR state.

The arrows in FIG. 1 indicate the rotational direction of the drum and gear combination and the direction of movement of the rack when the seat belt webbing (not shown) is taken out in the ELR state.

The present invention relates to a retractor device for an automobile seat belt having an ALR function, and in order to selectively implement the ALR function according to the seat belt webbing operation, an actuating lever (20) can be restrained when the retractor's drum is energized. An electromagnet 31 for rotating 24 is provided around the operating lever 24.

As the drum 20 is conventionally mounted, as described in the related art, the teeth 21 for reversing prevention are formed, and the operation lever 24 is formed by the balls 23 housed in the ball housing 22. If the pawl 25 is pivoted so that it is within the interference region of the reversal preventing teeth 21, its rotation is locked with respect to the drawing direction (unwinding direction, clockwise in each drawing) of the seat belt webbing (not shown). It is supposed to be.

Of course, when the pawl 25 locks the rotation of the drum 20, the webbing is no longer loosened in the drum 20, and the seat belt is locked. When the webbing is wound, the pawl 25 prevents reversal. The drum 20 can be rotated while leaving the interference area of the teeth 21.

In the present invention, the connecting rod 32 is connected to the opposite end of the pole 25 of the operating lever 24, and the metal member 33 attachable to the magnetized electromagnet 31 is attached to the tip of the connecting rod 32. Is installed.

In addition, the electromagnet 31 is connected by a wire to receive a current from the battery 2, the electromagnet 31 is connected to the wire again with the fixed contact 41 of the switch 40 to be described later.

Therefore, when the electromagnet 31 is energized, the metal member 33 is attached to the electromagnet 31 and the connecting rod 32 pulls one end of the operating lever 24, and the pole 25 is reversed. It enters into the interference area of the prevention tooth 21.

That is, when a current flows in the electromagnet 31, as the operating lever 24 rotates, the pole 25 is pulled out of the webbing (unwinding direction, clockwise in each drawing), independently of the conventional operation. It is to lock the rotation of the drum 20 relative to).

As such, the rotation of the drum 20 relative to the drawing direction of the webbing by the magnetization of the electromagnet 31 is a state in which the ALR function is implemented by the seat belt webbing operation (the state converted from ELR to ALR). , That is, the state of FIG.

On the other hand, in the present invention, in order to enable the electromagnet 31 to be selectively magnetized, the fixed contact of the switch 40, the output end of the electromagnet 31 is turned on (ON) / off (OFF) by the seat belt webbing operation 41 is connected to the wire.

The switch 40 is ON when the seat belt webbing is manipulated to change the retractor from the ELR state to the ALR state, that is, when the seat belt webbing is completely removed and completely released from the retractor. As the electromagnet 31 is energized, the rotation of the drum 20 is locked as described above, and thus the retractor is converted to the ALR state.

Here, for the on / off operation of the switch 40 as described above, the movable contact 42 of the switch 40 is installed on the pivoting bar 70 and grounded, and according to the rotation of the pivoting bar 70. It is adapted to selectively make electrical contact with the stationary contact 41 connected with the electromagnet 31.

The rotation bar 70 is rotated in a direction selected by the rack 60 moving forward and backward (up and down in FIG. 1). For this purpose, the rack 60 is disposed at both ends of the rotation bar 70 by a predetermined distance. The engaging portions 71 and 72 which are pushed forward and backward as much as they protrude toward the rack 60.

That is, the rotation bar 70 is selected in the direction in which the end of the rack 60, which is moved back and forth by the drum 20 and the gear combination 50 by the webbing operation, pushes the catches 71 and 72. It is to rotate, and by the rotation of the rotation bar 70 is intermittent between the movable contact 42 and the fixed contact (41).

On the other hand, the rack 60 is generally installed side by side with the rotation bar 70, is installed so as to move forward and backward by the gear combination 50 that is linked to the seat belt webbing operation.

The gear combination 50 is to be driven by receiving the rotational force of the drum 20, consisting of gears (51, 52) having a predetermined gear ratio, as illustrated, on the rotating shaft of the drum 20 It can be implemented by consisting of the small gear 51 provided and the standby gear 52 engaged between this small gear 51 and the rack 60. As shown in FIG.

Here, the gear ratio of the gear combination 50 and the length of the rack 60, the rack 60, which is the driven mechanism of the drum 20 and the gear combination 50 during the full take-out operation of the seat belt webbing for implementing the ALR function By virtue of the movement, the pivoting bar 70 should be considered in advance so that the pivoting bar 70 can be rotated to a position at which the movable contact 42 is closed (on operation of the switch).

Hereinafter, the operating state of the present invention will be described.

First, in the ELR state of the retractor, the webbing can be freely pulled out and wound up, and in some cases, the release / locking of the webbing is controlled according to the magnitude of the acceleration to be pulled.

That is, when the ball 23 accommodated in the ball housing 22 pushes the operation lever 24, the pawl 25 is in the interference region of the reversal preventing teeth 21 formed on the drum 20 of the retractor. Lock the rotation of the drum 20 with respect to the withdrawal direction (clockwise) of the webbing.

On the other hand, in order to mount the infant seat, when the webbing is pulled out, the webbing is released and the drum 20 is rotated, while the small gear 51 is rotated in the clockwise direction, and the waiting gear 52 is counterclockwise. As it rotates, the rack 60 moves upwards.

Then, when the drawing of the webbing is made to some extent, the upper end of the rack 60 is caught by the locking portion 71 of the upper rotation bar 70 to rotate the rotation bar 70 in a clockwise direction, and the complete webbing is made. In this state, as the movable contact 42 of the switch 40 is closed, the current flows through the electromagnet 31, and the metal member 33 is attached thereto. As a result, the operating lever 24 is pulled and rotated so that the pole 25 is drummed. Lock the rotation of (20).

As a result, while the reversal of the drum 20 is prevented, the webbing is only wound into the ALR state where the drawing is impossible.

In this ALR state, the seat belt webbing is continuously wound until it restrains the infant seat, but is not drawn out, so that the infant seat can be safely restrained.

Figure 2a shows the state that the seat belt is completely withdrawn and converted to the ALR state, which is maintained until release (switch off).

Next, when the seat belt webbing is rewound by removing the infant seat, each gear is rotated in the opposite direction at the same time as the drum 20 is rotated, and the rack 60 is also reversed downward.

Subsequently, in a state in which the webbing is wound to a certain degree, the bottom of the rack 60 is caught by the locking portion 72 at the bottom of the rotation bar 70 while rotating the rotation bar 70 counterclockwise, and at the same time, the switch 40 Upon being turned off, the retractor transitions back to the ELR state (state of FIG. 2B).

In this way, in the retractor apparatus of the automobile seat belt according to the present invention, the gear combination 50 and the rack 60 which cooperate with the rotation of the drum 20, and the rotation bar 70 which are rotated by the rack 60 are provided. And, the electromagnet 31 is operated by the switch 40 that is turned on by the rotation bar 70, through which the operating lever 24 restrains the rotation of the drum 20 with respect to the drawing direction of the webbing By being able to switch to the ALR function, there is an advantage that the implementation of a more reliable ALR operating state can be achieved even with a relatively simple configuration compared to the conventional configuration.

As described above, according to the retractor device of the vehicle seat belt according to the present invention, the gear combination and rack in conjunction with the rotation of the drum, the rotating bar rotated by the rack, and the switch that is turned on by the rotating bar The electromagnet is operated, and the actuating lever is configured to constrain the rotation of the drum with respect to the drawing direction of the webbing to switch to the ALR function, so that a more reliable ALR operation state can be realized with a relatively simple configuration. Compared to the complicated structure, there is an effect that the occurrence of malfunction can be reduced.

Claims (4)

The webbing is wound and the drum 20 with the reversal preventing teeth 21 formed thereon and the ball 23 rotated so that one end of the pawl 25 restrains the rotation of the drum 20 with respect to the drawing direction of the webbing. In the retractor device for an automobile seat belt comprising an actuating lever 24, Rotation of the drum 20 with respect to the drawing direction of the webbing can be constrained by the connecting rod 32 installed at the opposite end of the pawl 25 of the actuating lever 24 and the metal member 33 at its tip. An electromagnet (31) adapted to pivot the actuating lever (24); A switch 40 comprising a fixed contact 41 connected to the electromagnet 31 by a wire and a movable contact 42 grounded to the outside, and selectively applying power to the electromagnet 31; A gear combination 50 composed of gears 51 and 52 having a predetermined gear ratio and driven by the rotational force of the drum 20, and a rack 60 moving forward and backward by driving the gear combination 50; ; In accordance with the webbing operation is provided by the rotation bar 70 is rotated by the rack 60 forward or backward by a predetermined distance to open and close the movable contact 42 of the switch 40, Retractor device for a vehicle seat belt characterized in that the switch to the ELR or ALR state is selectively made in accordance with the webbing operation. According to claim 1, The rotating bar 70 is protruding toward the rack 60, the engaging portion 71, 72 is pushed in the state in which the rack 60 is moved forward or backward by a predetermined distance at both ends for the rotation Retractor device for vehicle seat belts, characterized in that formed. According to claim 1 or claim 2, wherein the rack 60, once the pull out of the webbing for the transition to the ALR state, the end of the rotating bar 70 so that the movable contact 42 of the switch 40 is closed Retractor device for a vehicle seat belt, characterized in that to rotate by pushing the locking portion 71. The movable contact (42) of the switch (40) according to claim 1 or 2, wherein the rack (60) is opened when the webbing is wound on the drum (20) for a predetermined length or more for switching to the ELR state. Retractor device for a vehicle seat belt, characterized in that to rotate by pushing the locking portion 72 of the other end of the rotation bar (70).