KR100973526B1 - lever crank type pretensioner for the seat-belt - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pretensioner mounted on a seat belt of a vehicle to fix a passenger to a seat during an impact, and more particularly, to a rotary pretensioner of a seat belt which further improves the safety of a passenger by increasing the winding distance of the belt.

To this end, an embodiment of the present invention is the pre-tensioner of the seat belt for rotating the cam is transmitted to the retractor through the clutch portion, rewinding the belt provided in the retractor, one end is coupled to the cam and the other end is elevated in the housing A link is provided which is coupled to the piston, and the link changes the height and the inclination angle according to the lifting and lowering of the piston to rotate the cam.

As a result, it is possible to secure a longer winding distance of the belt by converting the upward and downward movement of the limited piston into the rotational force of the cam, so that even when the passenger wears the belt loosely, the body of the passenger can be effectively restrained on the seat, It has the effect of increasing safety.

Pretensioner, Seat Belt

Description

Lever crank type pretensioner for the seat-belt}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pretensioner mounted on a seat belt of a vehicle to fix a passenger to a seat during an impact, and more particularly, to a rotary pretensioner of a seat belt which further improves the safety of a passenger by increasing the winding distance of the belt.

The seat belt of the vehicle is provided with a waist belt 10 surrounding the waist of the occupant and a shoulder belt 20 surrounding the shoulders and the chest, as shown in FIG. Three-point equations are commonly used.

The seat belt is provided with a retractor 40 positioned below the center pillar 30 of the vehicle to unwind or wind the belts 10 and 20.

In the event of a vehicle crash, the belt is locked by locking, but during the crash and for a short time before the belt is locked, the belt may be loosened and the occupant may come off the seat, causing the occupant to collide with the windshield or the side of the door. have.

Pretensioner (Pretentioner), which is one of the means for actively winding the unwinding of the belt, senses a shock generated in the vehicle and rewinds the belt by the explosive force of the micro gas generator (MGG).

A general pretensioner using an explosion pressure uses a rack and a pinion. For example, as illustrated in FIG. 4, the rack 60 inserted into the base cartridge 50 has a structure in which the rack 60 is engaged with the pinion 70. have. In case of emergency, when the gas generating mechanism 51 such as a micro gas generator explodes and ejects the expanded gas to the base cartridge 50, the rack 60 is pushed in the Y1 direction by the pressure, and the pinion 70 is opened. It will rotate in the X1 direction.

As the rotational force of the pinion 70 is transmitted to the cylindrical spool 90, which is wound around the belt through the clutch unit 80, as shown in FIG. 5, the spool 90 is reversed in a short time. To wind.

At this time, the clutch unit 80 has a function of transmitting rotational force to the spool during the rotation of the pinion 70 by the rack 50, while the rotation of the spool 90 independent of the pinion 70 is usually made. In this case, a method using planetary gears, a method using rollers, and a method using pole-lechet are generally used.

The clutch part and the retractor having such a function are generally well-known techniques described in Korean Patent Laid-Open Nos. 10-2006-54684, 10-801603, 10-10901, and the like.

On the other hand, in the conventional retractor using the explosive force of the micro gas generator, the pinion is rotated by the moving length of the rack obtained by the explosion of the micro gas generator, so that it is difficult to increase the winding length of the belt.

In other words, in order to increase the winding length of the belt, it is necessary to increase the explosive force of the micro gas generator that moves the rack. This is because the initial winding force of the belt is greatly increased. There is a problem.

Therefore, it is necessary for the micro gas generator to secure a long winding length of the belt so as to reliably restrain the occupant's body while exploding the same amount.

The present invention has been made to solve the above-described problem, an embodiment of the present invention has an object of ensuring a long winding length of the belt using a piston that moves linearly in a limited space.

Specifically, the belt is continuously wound during the up and down movement of the piston, so that the belt is wound longer by one up and down movement.

In addition, the raising and lowering of the piston for winding the belt has the purpose of being made by one-time combustion of the micro gas generator.

In order to solve the above problems, the present invention is an embodiment of the pre-tensioner of the seat belt, the rotation of the cam is transmitted to the retractor through the clutch portion, rewinding the belt provided in the retractor, one end is coupled to the cam and the other end A link coupled to a lifting piston is provided in the housing, and the link provides a rotary pretensioner for rotating the cam, the height and the inclination angle of the link being changed according to the lifting of the piston.

In addition, the link is located on the lower end of one side of the cam when the piston is located at the lowermost portion of the cylinder hole, and is located on the other upper end of the cam when the piston is located at the top. Present a rotary pretensioner.

In addition, a housing including a cylinder hole in which the piston is elevated, a combustion hole communicating with the upper and lower portions of the cylinder hole and through the first and second discharge ports, and firing a micro gas generator installed therein; A first pressing space for raising the piston is formed by the pressure of the gas introduced through the discharge port, and after the piston is raised to the maximum, a second pressing space for moving the piston downward through the second discharge port is formed. A rotary pretensioner of the seat belt is provided.

In addition, a first discharge hole for discharging the combustion gas to the outside is formed in the lower portion of the first pressurized space, and the second discharge hole for discharging the combustion gas to the outside is formed in the upper portion of the second pressing space Present a rotary pretensioner of the belt.

According to the rotary pretensioner of the seat belt according to the embodiment of the present invention as described above, it is possible to ensure a longer winding distance of the belt by converting the vertical movement of the limited piston to the rotational force of the cam, so that the passengers wear the belt loosely Even if it is possible to effectively restrain the occupant's body to the seat, it has the effect of increasing the safety in the event of a crash.

In addition, by allowing the cam to rotate in both the up and down movement of the piston, it is possible to transmit the up and down force of the piston to the rotational force of the cam, so that the winding force of the belt can be continuously maintained, thereby securing the occupant's body to the seat for a long time. It has an effect that can be done.

In addition, since the piston explodes both up and down by a single explosion of the micro gas generator, installation space can be reduced, space utilization can be improved, and the belt can be rewound by a single explosion command. It has the effect of increasing the reliability of the operation.

Hereinafter, the function, configuration and operation of the rotary pretensioner of the seat belt of the present invention will be described in detail with reference to preferred embodiments of the accompanying drawings.

1 is a partial cross-sectional view of a rotary pretensioner of a seat belt according to an embodiment of the present invention.

In the rotary print tensioner 100 of the seat belt according to the preferred embodiment of the present invention, a cam 120 connected to the retractor 200 through the clutch unit 110 and a piston 140 connected through the cam and the link. ) And a housing 150 that surrounds the piston 140 to rotate and move therein.

At this time, the retractor 200 is provided with a conventional spool 210 for winding or unwinding the belt 211 wound in accordance with the rotation direction.

In addition, the clutch unit 110 is a conventional member having a function of allowing the spool 210 to be rotated independently of the cam 120 at normal times, and for engaging the spool with the cam 120 when the cam 120 is rotated.

Such a retractor 200 and the clutch unit 110 is generally having a widely used configuration. That is, as described above, the clutch unit 110 is generally widely used, such as a method using a planetary gear, a method using a roller, and a method using a pole-lechche, as described above. Since it is generally well-known technology as described in the registered patent No. 10-801603, the registered patent No. 10-590193, etc., duplicate description is omitted.

In the rotary print tensioner 100 of the seat belt according to the embodiment of the present invention, the rotation of the cam 120 is transmitted to the retractor 200 through the clutch unit 110, and is provided in the retractor 200. In the seat belt pretensioner for rewinding the belt 211, a link 130 is provided, one end of which is coupled to the cam 120 and the other end of which is coupled to a piston 140 that rises and falls inside the housing 150. The height and inclination angle of the link 130 are changed according to the elevation of the 140, and the cam 120 is rotated.

At this time, the cam 120 has a substantially disk shape, and the piston 140 linearly moves up and down in the housing 150.

In addition, one end of the link 130 is rotatably coupled to the cam 120, and the other end is rotatably coupled to the upper end of the piston 140, so that the inclination angle and height thereof are increased as the piston 140 is raised or lowered. It has a function of switching the vertical movement of the piston 140 to the rotational movement of the cam 120 while changing.

At this time, according to the distance between the rotation center of the cam 120 and the coupling position of the other end of the link 130, the rotation angle of the cam 120 is changed according to the displacement of the piston 140, the cam rotation The closer the coupling position between the center and the other end of the link is, the larger the rotation angle of the cam can be to achieve a faster winding speed of the belt. Therefore, by adjusting the coupling position of the link and the cam will be able to set to wind the belt at an appropriate speed.

2A to 2C are cross-sectional views illustrating a state of use of the rotary pretensioner of the seat belt shown in FIG. 1.

Since the installation space of the retractor 200 and the print tensioner 100 installed below the center pillar is limited, the movable section of the piston is also limited to the limited range. Therefore, both the raising and the lowering of the piston need to be configured such that the cam is rotated.

To this end, in the rotary print tensioner 100 of the seat belt according to a preferred embodiment of the present invention, the link 130 is the cam (when the piston 140 is located at the bottom of the cylinder hole 151) 120 is located at the lower end of the side, when the piston 140 is located at the top, it is located at the other upper end of the cam.

That is, in a state in which the piston 140 is moved to the lowermost part of the cylinder hole 151, the link 130 coupled to one side of the cam 120 determines the rotation direction of the cam when the piston 140 is raised. It is. At this time, the link 130 is coupled to one side of the cam 120 in the rotational direction of the spool 210 to rewind the belt 211.

Thereafter, as shown in FIG. 2A, when the piston 140 rises, the height of the link 130 also increases and the inclination angle decreases, while the other end of the link 130 coupled to the cam shares the rotation center of the cam. Ascending to one side of the cam along the circular trajectory 121 to pass, and the inclination angle is increased by the continuous rise of the piston 140 to pass through the upper side of one side of the cam.

In this case, as shown in FIG. 2B, when the piston 140 is positioned at the top, the other end of the link 130 coupled to the cam 120 passes through the top dead center 121a of the circular trajectory 121. The other side of the up to reach, and then as shown in Figure 2c, as the piston 140 is lowered, the other end of the link 130 is to continue to rotate the cam.

In this case, by rotating the cam 120 in both the up and down movement of the piston 140 limited to a certain distance, it is possible to transfer the vertical movement force of the piston 140 as the rotational force of the cam 120.

As a result, the vertical movement of the piston having a limited range can be converted to the rotational force of the cam, thereby ensuring a longer winding distance of the belt. Therefore, as the belt pulling distance that restrains the occupant's body becomes longer, even when the occupant wears the belt loosely, the occupant's body can be effectively restrained on the seat, thereby increasing safety during a collision.

On the other hand, the housing 150, the cylinder hole 151 to which the piston 140 is raised and lowered, and the cylinder so that both the raising and lowering of the piston 140 is forcibly made by using one explosion force. The lower and upper portions of the hole 151 and the first and second discharge ports 152a and 152b communicate with each other, and a combustion hole 152 is provided to ignite the micro gas generator installed therein, and the piston 140 has a first hole. The first pressurizing space 141 is formed to raise the piston 140 through the pressure of the gas introduced through the discharge port 152a, and when the piston 140 is raised to the maximum, the second discharge port 152b is provided. A second pressurized space 142 may be formed to move the piston 140 downward.

At this time, the cylinder hole 151 formed in the housing 150 has a bottom surface 151a formed at the lower portion thereof to prevent the piston 140 from being separated to the lower portion, and restricts the maximum rising height of the piston 140 at the upper portion thereof. A stopper (not shown) may be provided.

In addition, a combustion hole 152 provided in parallel with the cylinder hole 151 is provided inside the housing 150, and a micro gas generator 154 is installed inside the combustion hole 152. do.

At this time, the micro gas generator 154 is a means for generating a large amount of gas in an instant. For example, when the instantaneous high-pressure current flows, the micro gas generator 154 may be an explosive generating gas.

On the other hand, the combustion hole 152 communicates with the lower portion of the cylinder hole 151 through the first discharge port 152a, and communicates with the upper portion of the cylinder hole 151 through the second discharge port 152b. As a result, the high-pressure gas generated in the combustion hole 152 due to the explosion of the micro gas generator 154 is discharged into the cylinder hole 151 through the first discharge port 152a or the second discharge port 152b. Will be equipped.

On the other hand, the piston 140 is a substantially cylindrical shape having a diameter corresponding to the inner diameter of the cylinder hole 151, when the piston 140 is located on the bottom surface 151a of the cylinder hole 151, that is, the piston is the lowest When positioned at, the first pressurizing space 141 communicating with the first discharge port 152a is formed.

At this time, the first pressing space 141 is a portion of the side of the piston 140 is crushed to a predetermined depth, as shown in Figure 1, for example, leaving a cylindrical pillar in the center and the side has a donut-shaped rupture shape Can be.

In this case, a first discharge hole 141a through which a portion of the high pressure gas is discharged may be formed below the first pressurization space 141. That is, a portion of the high pressure gas introduced into the first pressurizing space 141 is discharged to the first discharge hole 141a, so that a pressure for pressurizing the upper surface of the first pressurizing space 141 is lowered. The piston is raised by being greater than the pressure to pressurize.

In this case, since a part of the gas generated by the explosion of the micro gas generator escapes to the first discharge hole and the explosion pressure is buffered, the initial pulling force of the belt is reduced, and the amount of impact transmitted to the occupant's body is reduced by winding the belt. Therefore, due to the belt being wound, the impact transmitted to the occupant's body is reduced, thereby increasing safety.

On the other hand, the second pressurizing space 142, the piston is raised, the first pressurizing space 141 is blocked by the side wall 153 partitioning the first discharge port 152a and the second discharge port 152b, the first pressure space ( 141 is formed to communicate with the second discharge port (152b) at a height that is blocked.

In addition, the second pressurizing space 142 is blocked by the side wall 153 between the first discharge port 152a and the second discharge port 152b when the piston is located at the lowermost part, so that the second pressurizing space 142 does not communicate with the second discharge port 152b. It is formed at the height.

At this time, the shape of the second pressing space 142 is the same as the rough shape of the first pressing space. However, a second discharge hole 142a through which some gas is discharged to the outside is formed on the upper surface of the second pressurizing space 142 so that the pressure of the gas introduced into the second pressurizing space acts on the lower surface of the second pressurizing space. The piston 140 is to move down.

In this case, the high-pressure gas generated by the explosion of the micro gas generator 154 in the combustion hole 152 is first blocked by the first discharge port 152a while the second discharge port 152b is blocked. Inflow to the piston to raise the 140.

Since the first discharge port 152a is blocked by the rise of the piston 140, and the second pressurizing space 142 is raised to the second discharge port 152b, the excess gas remaining in the combustion hole 152 is pressurized to the second pressure. It is introduced into the space 142 to move the piston 140 again.

In this case, the piston can be continuously moved up and down by one micro gas generator explosion, and the winding length of the belt can be secured as described above by the link and cam provided at the upper part of the piston.

In addition, since the piston explodes both up and down by a single explosion of the micro gas generator, installation space can be reduced, space utilization can be improved, and the belt can be rewound by a single explosion command. The reliability of the operation is increased.

1 is a partial cross-sectional view of a rotary pretensioner of a seat belt according to an embodiment of the present invention.

2A to 2C are cross-sectional views showing the use state of the rotary pretensioner of the seat belt shown in FIG.

Figure 3 is a view showing the configuration of a conventional seat belt.

Figure 4 is a side view showing a conventional pretensioner.

5 is an exploded perspective view of a conventional pretensioner and a retractor.

Explanation of symbols on the main parts of the drawings

100: Pretensioner

110: clutch part

120: cam

121: circle trajectory 121a: top dead center 130: link

140: piston

141: first pressure space 141a: first discharge hole 142: second pressure space

142a: second discharge hole

150: housing

151: cylinder hole 151a: bottom surface 152: combustion hole

152a: first discharge port 152b: second discharge port 153: side wall

154: Micro Gas Generator

200: Retractor

210: spool 211: belt

Claims (4)

In the pre-tensioner of the seat belt, the rotation of the cam 120 is transmitted to the retractor 200 through the clutch unit 110, and rewinds the belt 211 provided in the retractor 200, One end is coupled to the cam 120 and the other end is provided with a link 130 is coupled to the piston 140 to move up and down inside the housing 150, Rotating pretensioner of the seat belt, characterized in that the height and the inclination angle of the link 130 is changed in accordance with the lifting and lowering of the piston (140). In claim 1, The link 130 is located at the lower end of one side of the cam 120 when the piston 140 is located at the bottom of the cylinder hole 151 formed in the housing 150, When the piston (140) is located on the top of the cylinder hole (151), the rotary pretensioner of the seat belt, characterized in that located on the other upper end of the cam (120). In claim 2, The micro gas generator 154 installed therein is in communication with the cylinder hole 151 in which the piston 140 is elevated, and the lower and upper portions of the cylinder hole 151 and the first and second discharge ports 152a and 152b. The housing 150 is provided with a combustion hole 152 is ignited, The piston 140 is A first pressurized space 141 is formed to raise the piston 140 by the gas introduced through the first discharge port 152a. When the piston 140 is located at the top of the seat belt is characterized in that the second pressure space 142 for moving the piston 140 to the bottom by the gas introduced through the second discharge port (152b) is formed Rotary pretensioner. 4. The method of claim 3, A first discharge hole (141a) for discharging some gas to the outside is formed in the lower portion of the first pressing space 141, Rotating pretensioner of the seat belt, characterized in that the second discharge hole (142a) for discharging some gas to the outside of the second pressing space (142) is formed.

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