KR100620620B1 - Pretensioner of retractor for a seat belt - Google Patents

Abstract

A pretensioner of a retractor for a seat belt is disclosed. The retractor includes a housing member in which a ball guide member is installed, a clutch member installed in the housing member, and rotated by a ball member, a pinion member rotating in engagement with the clutch member, and a cam portion integrated with the pinion member and a belt winding member. It is fitted with a roller member to integrate the pinion member and the belt winding member. According to this retractor, the ball member which transmits the explosive force of the explosion member and the clutch member which receive it are always kept in stable contact, and also the clutch member and pinion member are always correctly engaged, and the When the explosion member is operated by receiving an electrical signal from the vehicle during the collision, the contact area is maintained in a stable contact state so that no loss of explosive force is generated. As a result, the explosive force is converted into rotational motion so that the belt winding member is accurate and fast. It is possible to rewind the belt to fix the body.

Seat, Belt, Retractor

Description

Pretensioner of retractor for seat belt {PRETENSIONER OF RETRACTOR FOR A SEAT BELT}

1 is an exploded perspective view showing a pretensioner of a retractor for a seat belt according to the present invention.

Figure 2 is a perspective view showing a pretensioner coupling state of the retractor for the seat belt shown in FIG.

3 is a cross-sectional view taken along the line AA ′ of FIG. 2.

Figure 4 is a schematic diagram showing a state in which the hook shown in Figure 1 is coupled to the locking groove.

5A, 5B and 5C are cross-sectional views showing an operating state of the pretensioner shown in FIG.

6A and 6B are partially enlarged views showing operating states of the pinion member and the roller member.

Figure 7a, 7b is a schematic cross-sectional view for explaining the operating state of the pretensioner according to the prior art.

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

10 belt 20 housing member

22: accommodating part 24: rotating support shaft

26: locking groove 30: ball guide member

32: moving member 34: explosion member

40: ball member 50: clutch member

52: inner gear 54: jamming projection

60: pinion member 62: outer gear

64: slope 66: cam portion

70: clip member 72: insertion portion

74 hook 76 rotational support

78: mounting portion 80: roller member

82: anti-slip projection 90: belt winding member

The present invention relates to a pretensioner of the seat belt retractor, the present invention is to prevent the displacement of each connection portion when the explosion force of the explosion member is generated so that the explosion force of the explosion member is transmitted to the belt winding member without loss to rewind the belt. A pretensioner for a retractor for a seat belt that can be made accurately.

In general, seat belts are installed in the seat of the vehicle. These seat belts have a function of minimizing the possibility of injury by fixing the driver or passenger to the seat in the event of a vehicle accident.

Recently, such a seat belt rewinds the belt when the vehicle collides with the pretensioner of the retractor, thereby closely fixing the driver or passenger to the seat.

That is, when the collision of the vehicle is detected, the explosion member installed in the retractor is operated to generate an explosive force. The explosive force of the explosive member causes the ball member to reverse the belt winding member to rewind the belt.

As such, when the vehicle collides, the belt is temporarily rewound and the passenger or driver is closely fixed to the seat, thereby minimizing the travel distance caused by the inertia of the driver or the passenger, thereby causing a possibility of injury of the driver or passenger that may occur inside the vehicle. Can be minimized.

However, the retractor according to the prior art has a problem that the explosive force is not accurately transmitted to the belt winding member during the explosion operation of the explosion member.

That is, in the retractor having the structure as shown in FIG. 7A, the positions of the teeth 1-1 and the ball member 2 of the operation wheel 1 connected to the belt winding member (not shown) may be positioned as shown in FIG. In this case, the explosion force may not be correctly transmitted to the operating wheel 1, which may cause a problem that the belt winding member is reversely rotated to rewind the belt at about the same time as the collision. there was.

In other words, when the explosive force of the explosive member is generated, each ball member 2 is instantaneously seated between the teeth 1-1 so that the operating wheel 1 is rotated reversely so that the belt winding member, not shown, rotates backward. In the retractor having a structure as shown in FIG. 7A, when the collision of the vehicle occurs, the ball member 2 may abnormally contact the teeth 1-1 of the operation wheel 1. This caused a phenomenon in which the explosive force is lost, which may cause a problem that the ball member 2 does not rotate the operating wheel 1 quickly and accurately.

On the other hand, the retractor of the structure shown in Figure 7b is the ball member 2 is the ring gear (4) due to the explosion force during the collision of the vehicle in the state that the pinion gear (5) located inside the ring gear (4) is not engaged with each other When rotated while moving downward, the pinion gear 5 is engaged with the inner gear of the ring gear 4 in the ring gear 4, and thus the belt winding member connected to the pinion gear 5 (not shown). Is reversed to rewind the belt.

However, the retractor having such a structure is a ring gear (4) rotated by the ball member (2) during the collision of the vehicle when the inner gear of the ring gear (4) and the pinion gear (5) are not in contact with each other. Since it is configured to engage with the pinion gear 5 installed inside 4), as shown in FIG. 7B, the pinion gear 5 and the ring gear 4 may not be correctly engaged, resulting in a loss of explosive force. Can be. This loss of the explosive force could cause a fatal problem that the belt winding member can not rewind the belt almost at the same time as the collision of the vehicle.

The present invention has been made to solve the problems of the prior art as described above, the technical problem of the present invention is to maintain the state in which the ball member and the clutch member to receive the explosive force of the explosion member is always in contact with the clutch member and The pinion member is always engaged to prevent the loss of explosive power, and to prevent the contact portion of each part from shifting, so that the belt winding member rewinds the belt accurately and quickly during the collision and collision of the vehicle. It is to provide a means that can be fixed.

Another technical problem of the present invention is that the pinion member and the belt winding member are not normally coupled to each other, and the pinion member and the belt winding member are integrated only when the vehicle collides or collides so that the belt winding member is reversely rotated by the explosive force. To provide a means to do so.

The present invention for solving the technical problem as described above is formed in the receiving portion formed to be opened to one side of the cylindrical rotary support shaft protruding to one side, the other side of the rotary support shaft is formed with a locking groove, forcing the moving member A housing member having a ball guide member installed at one side of the accommodation portion, the explosion guide member being installed at the inlet and configured to guide the plurality of ball members accommodated therein;

An inner gear is formed on the inner circumference, and a latching protrusion is formed on one side of the outer circumference, and the clutch member is rotatably installed in the receiving portion of the housing member while the locking protrusion is always in contact with the ball member located at the end of the ball guide member. ;

An outer gear is formed on one side of the outer circumference and meshes with an inner gear, and a cam part is formed on the other side with a plurality of inclined surfaces radially curved from the inner side to the edge so that the outer gear and the inner gear are always engaged. A pinion member coupled to the rotation support shaft;

A cylindrical insert is formed at one side, and a hook is formed at an outer side of the end of the insert. On the other side of the insert, an installation part having a number of rotational supports corresponding to the number of the inclined surfaces is formed so that each of the rotational supports is provided on each inclined surface. A clip member to which the hook is fixedly coupled to the locking groove so as to correspond; And

Each of the rotatable supports is rotatably installed, and moves between the inclined surface and the inner circumference of the belt winding member when the pinion member is rotated by the explosive force of the explosion member to integrate the pinion member and the belt winding member to rewind the rotation force of the pinion member. It provides a pre-tensioner of the seat belt retractor comprising a; a plurality of roller members for transmitting to the belt winding member.

At this time, the outer periphery of the clutch member is characterized in that a plurality of seating grooves for successively seating each ball member is formed.

Rotating support portion of the clip member is characterized in that it comprises a support end formed by cutting the inner side of the installation portion is formed so as to be deformed to the outside when the roller member is moved; and a roller support shaft integrally formed at the end of the support end.

On the other hand, the outer periphery of the roller member is characterized in that a plurality of anti-slip projections are formed.

The present invention having the above characteristics maintains a stable contact state between the ball member and the clutch member which transmits the explosive force, and the clutch member and the pinion member always maintain the engaged state, so when an impact such as a vehicle collision occurs. When the explosive force of the explosion member moves the ball member, the clutch member in stable contact with the ball member is rotated.

The rotation of the clutch member rotates the pinion member which is always engaged with the inner gear of the clutch member so that the roller member is sandwiched between the cam portion of the pinion member and the belt winding member to integrate the pinion member and the belt winding member.

Therefore, the pinion member and the belt winding member are integrated so that the explosive force generated due to the collision of the vehicle is transmitted to the belt winding member to reverse the belt winding member. In this process, the belt winding member is reversed so that the belt is rewound by a predetermined length.

At this time, the ball member and the clutch member are always in stable contact with each other, and the clutch member and the pinion member are always in the engaged state, so that the pinion member is rotated without the loss of the explosive force so that the belt winding member is reversed. Will be.

Therefore, the explosion force of the explosion member during the collision of the vehicle is transmitted to the belt winding member through the pinion member without loss, so that the belt is quickly rewound at the same time to fix the body to the seat.

On the other hand, since each roller member is normally kept spaced apart from the inner circumference of the belt winding member, the belt winding member can be operated smoothly without interference with the pinion member in a state where a collision does not occur.

That is, the belt winding member is normally operated freely, the cam portion of the pinion member and the belt winding member are integrated by a plurality of roller members only when the vehicle collides, so that the explosive force can be transmitted to the belt winding member.

At this time, since the anti-slip protrusion is formed on the surface of the roller member, it can be firmly fixed without slipping between the inner periphery of the cam portion and the belt winding member.

When described in detail with reference to the accompanying drawings a preferred embodiment of the present invention having such features as follows.

1 and 2 are an exploded perspective view and a combined perspective view showing a pretensioner of the seat belt retractor according to the present invention, Figure 3 is a cross-sectional view taken along line AA 'of Figure 2, Figure 4 Figure 1 is a schematic diagram showing a state in which the hook shown in Figure 1 is coupled to the locking groove.

As shown in FIGS. 1 to 4, the retractor according to the preferred embodiment of the present invention is always stabilized with the housing member 20 and the ball member 40 on which the explosion member 34 and the ball member 40 are installed. The clutch member 50 to maintain the contact state, the pinion member 60 to maintain a state of always engaged with the clutch member 50, the belt winding member 90 so that the belt is wound, the pinion member 60 and It is composed of a plurality of roller member 80 is installed between the belt winding member 90 and the clip member 70 for rotationally supporting the roller member 80.

Looking at this in more detail as follows.

The housing member 20 is configured such that each component is built in, and a cylindrical rotary support shaft 24 protrudes to one side at the bottom of the receiving portion 22 formed to be opened to one side, the rotary support shaft 24 On the other edge of the engaging groove 26 is formed. The locking groove 26 is formed at the inner diameter edge of the rotation support shaft 24 on the other side of the housing member 20.

The accommodating part 22 is provided with an arc-shaped ball guide member 30 is formed to be curved toward the edge side, the explosion member 34 is installed at the inlet of the ball guide member 30. In addition, a moving member 32 which is moved by the gas pressure when an explosion force of the explosion member 34 is generated is installed therein, and a plurality of ball members 40 which are moved by the moving member 32 are successively installed.

The clutch member 50 is rotated by the movement of the ball member 40 to transmit the rotational force to the pinion member 60, the inner gear 52 is formed on the inner circumference, the engaging projection on one side of the outer circumference 54 is formed, and a plurality of seating grooves 56 for successively seating each ball member 40 are formed on a part of the outer circumference. The seating groove 56 is engaged with each ball member 40 as a gear so that the moving force of each ball member 40 is accurately transmitted to the clutch member 50 without loss.

The clutch member 50 has a receiving portion 22 of the housing member 20 such that the engaging protrusion 54 is in stable contact with the ball member 40 located at the end of the ball guide member 30 at all times. It is installed rotatably in.

The pinion member 60 is for transmitting the rotational force of the clutch member 50 to the belt winding member 90, the outer gear 62 which is engaged with the inner gear 52 is formed on one outer periphery, the other The side has a structure in which a cam portion 66 in which a plurality of inclined surfaces 64 gradually curved from the inner side to the edge side is disposed radially. The inclined surface 64 is formed to form a cam curve (spiral) curved from the inside to the outside as shown in FIGS. 1 and 3. Therefore, the roller member 80 moves away from the center of the pinion member 60 as it moves from the inner side to the outer side along the inclined surface 64.

The pinion member 60 is installed to the rotation support shaft 24 so that the outer gear 52 and the inner gear 62 are always engaged.

On the other hand, the tooth ratio (gear ratio) of the clutch member 50 and the pinion member 60 is 2: 1 to 3: 1.

The increase in the gear ratio of the clutch member 50 as compared with the pinion member 60 is to obtain a high rotational speed of the pinion member 60 by the small rotation of the clutch member 50. For example, when the clutch member 50 makes 1/2 rotation, the pinion 60 is to make 1 rotation. By such a structure, a large reverse rotation amount of the pinion member 60 can be obtained, thereby ensuring a stable reverse rotation amount.

The clip member 70 supports the roller member 80 to be rotated without departing from the operating range of the inclined surface 64 of the cam portion 66, and a cylindrical insertion portion 72 is formed at one side thereof. A hook 74 is formed outside the end of the 72, and an installation portion 78 having a number of rotation support portions 76 corresponding to the number of the inclined surfaces 64 is formed on the other side of the insertion portion 72. . The hook 74 is caught by the locking groove 26 when the insertion portion 72 is inserted into the rotary support shaft 24. Accordingly, the insertion portion 72 is rotatable inside the rotation support shaft 24 when the hook 74 is broken or detached from the locking groove 26.

The rotary support 76 is formed as follows to allow this within the set range during the movement of the roller member 80. That is, the rotary support portion 76 is integrally formed with the support end 78A formed by cutting the inner side of the installation portion 78 so as to be deformed to the outside when the roller member 80 moves, and the end of the support end 78A. It is made of a roller support shaft (78B) is formed. Therefore, when the roller member 80 moves outward along the inclined surface 64, the support end 78A is deformed to allow this.

The roller support shaft 78B is formed integrally with the rotation support 76, but is not limited thereto, and may be configured as a separate rotation shaft.

The roller member 80 is for transmitting the rotational force transmitted to the pinion member 60 to the belt winding member 90, each rotatably installed on the roller support shaft (78B). In addition, the anti-slip protrusion 82 is formed on the outer circumference of the roller member 80. The anti-slip projection 82 is to prevent the roller member 80 from being caught between the inclined surface 64 and the inner circumference of the belt winding member 90 by sliding.

Meanwhile, the accommodating part 22 of the housing member 20 in which the clutch member 50, the pinion member 60, the clip member 70, the roller member 80, and the like are installed is closed by the clutch cover and the housing cover. The one end of the shaft of the belt winding member 90 is coupled to the return spring, the body is rotatably installed in the frame of the retractor, and the other end of the shaft is coupled to the latch and closed by the wheel cover.

Referring to the operation of the present invention configured as described above is as follows.

As shown in FIG. 5A, since the moving member 32 does not move in a state where a collision or collision of a vehicle does not occur, the ball member 40 is maintained in a state where the ball member 40 is initially installed. It is in the state located inward (position near the center of the cam part 66) of the inclined surface 64. As shown in FIG. That is, as shown by a solid line in FIG. 6A, the roller member 80 is maintained at a position close to the center of the pinion member 60. Therefore, the roller member 80 is in a state in which the belt winding member 90 can be operated normally without being in contact with the belt winding member 90.

At this time, the hook 74 of the clip member 70 is inserted into the locking groove 26 of the housing member 20 and fixedly coupled as shown in FIG. Thus, the clip member 70 is in an integrated state with the housing member 20.

When a collision of the vehicle occurs in this state, the explosion member 34 is operated by an electrical signal, and the moving member 32 is guided to the ball guide member 30 as shown in FIG. While forcing each ball member 40 is moved.

The ball member 40 moved by the moving member 32 is to push the locking projection 54 of the clutch member 50 to rotate the clutch member 50.

When the clutch member 50 rotates in this process, the pinion member 60 engaged with the inner gear 52 rotates so that the cam portion 66 rotates clockwise, and thus, a dashed line in FIG. 6B. As shown in the drawing, each roller member 80 in a state in which rotation is prevented by the clip member 70 has a result of being moved from the inner side to the outer side of the inclined surface 64. The actual roller members 80 are not moved, but the cam portion 66 is rotated so that the contact positions of the roller members 80 and the inclined surface 64 are changed.

As the process proceeds, each inclined surface 64 results in moving each roller member 80 to the outside (to move away from the center of the cam portion 66), whereby each roller member 80 The pinion member 60 and the belt winding member 90 are integrated between the outer side of the inclined surface 64 and the inner circumference of the belt winding member 90.

That is, when the pinion member 60 engaged with the clutch member 50 rotates by the movement of the ball member 40 as shown in FIG. 5B, the position of the cam portion 66 of the pinion member 60 is changed. The roller member 80 is sandwiched between the outer portion of each inclined surface 64 and the inner circumference of the belt winding member 90 so that the pinion member 60 and the belt winding member 90 are integrated. The rotational force of 60 is transmitted to the belt winding member 90.

When the position of each roller member 80 is changed by the rotation of the pinion member 60 as described above, each support end 78A is deformed outward to allow the movement of each roller member 80.

At this time, since the anti-slip projection 82 is formed on the surface of each roller member 80, even if it is located between the inclined surface 64 and the belt winding member 90 is not separated therebetween.

In this process, when the pinion member 60 and the belt winding member 90 are integrated by each roller member 80, the pinion member 60, the roller member 80 and the belt winding member 90 are rotated. At this time, as shown in FIG. 4, the hook 74, which is fixedly engaged by the locking groove 26, is damaged, and the clip member 70 and the roller members 80 are pinion member 60 and the belt winding member. Rotate simultaneously with 90).

Accordingly, the rewinding of the belt by the above operation is performed until the stopping projection 54 is stopped by the stopper formed on one side of the accommodating portion 22 as shown in FIG. 5C. And the belt is then locked.

As such, the ball member 40 and the clutch member 50 remain in a stable contact state, and the explosive force is generated in the state in which the clutch member 50 and the pinion member 60 are correctly engaged with each other. The explosive force of is converted into a rotational motion without loss is accurately transmitted to the belt winding member 90 is to rewind and secure the belt.

The pretensioner of the seat belt retractor according to the present invention maintains a stable contact state between the ball member that transmits the explosive force of the explosion member and the clutch member that receives it, and also ensures that the clutch member and the pinion member are always correctly engaged. As a result, the contact area of each part is stably in contact with each other when the vehicle collides, so that no loss of explosive force is generated. As a result, the explosive force is converted into a rotational motion so that the belt winding member can accurately and quickly It can be rewound to fix the body.

In addition, the pretensioner of the seat belt retractor according to the present invention, since each roller member is not in contact with the inner circumference of the belt winding member normally, the belt winding member operates smoothly, The pinion member and the belt winding member are integrated by the roller member so that the explosive force is converted into the rotational movement so that the belt winding member can be reversely rotated.

On the other hand, when the tooth ratio between the clutch member and the pinion member is increased, a high rotational speed of the pinion member can be obtained even with a small rotation of the clutch member, and thus a large reverse rotation amount can be obtained with a small force, thereby providing a stable reverse rotation amount. It will be secured.

Claims (5)

In the receiving portion 22 formed to be opened to one side, a cylindrical rotary support shaft 24 protrudes to one side, and a locking groove 26 is formed at the other edge of the rotary support shaft 24, and the movable member 32. Explosion member (34) for forcing the movement of the housing member is installed at the inlet and the ball guide member 30 formed to guide the plurality of ball members 40 accommodated therein is installed on one side of the receiving portion ( 20); An inner gear 52 is formed on the inner circumference, and a locking protrusion 54 is formed on one side of the outer circumference, and the locking protrusion 54 is always in contact with the ball member 40 located at the end of the ball guide member 30. A clutch member (50) rotatably installed in the receiving portion (22) of the housing member (20) in a closed state; An outer gear 62 that is engaged with the inner gear 52 is formed on one side outer circumference, and on the other side, a cam portion 66 in which a plurality of inclined surfaces 64 that are gradually curved from the inner side to the edge side are formed radially is formed. A pinion member (60) coupled to the rotation support shaft (24) so that the outer gear (52) and the inner gear (62) are always engaged; A cylindrical insertion portion 72 is formed at one side, and a hook 74 is formed at the outer end of the insertion portion 72, and the number corresponding to the number of the inclined surfaces 64 on the other side of the insertion portion 72. An installation portion 78 having a rotation support portion 76 is formed so that the hook member 74 is fixedly coupled to the locking groove 26 so that each rotation support portion 76 corresponds to each inclined surface 64. 70); And Respectively installed rotatably on each of the rotary support parts 76 and moved between the inclined surface 64 and the inner circumference of the belt winding member 90 when the pinion member 60 rotates due to the explosive force of the explosion member 30. A plurality of roller members 80 for integrating the pinion member 60 and the belt winding member 90 to transfer the rewinding rotational force of the pinion member 60 to the belt winding member 90; Pretensioner of the retractor for seat belts comprising a. The pretensioner of claim 1, wherein a plurality of seating grooves 56 are formed on the outer circumference of the clutch member 50 so as to seat each ball member 40. The support end 78A of claim 1, wherein the rotation support part 76 of the clip member 70 is formed by cutting an inner side of the installation part 78 so as to be deformed outward when the roller member 80 moves. A roller support shaft 78B integrally formed at the end of the support end 78A; Pretensioner of the retractor for seat belts comprising a. The pretensioner according to any one of claims 1 to 3, wherein the tooth ratio of the clutch member (50) and the pinion member (60) is 2: 1-3: 1. The pretensioner according to claim 4, wherein a plurality of anti-slip protrusions (82) are formed on the outer circumference of the roller member (80).

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