KR20220086502A - Seat belt device - Google Patents

Abstract

The present invention relates to a seat belt device. The seat belt apparatus includes: a seat belt retractor mounted on a seat back of a seat and inclined to the left or right by a predetermined angle with respect to an up-and-down direction of the seat back, and for winding up the seat belt when necessary; and a rope belt advancing and retracting mechanism having a rope belt, wherein the rope belt is capable of advancing or retracting by a corresponding distance according to an angle of rotation of the seatback with respect to the seat cushion of the seat. The seat belt retractor includes: an acceleration sensor used to measure the acceleration of the vehicle in a fore-and-aft direction, the seat belt retractor locks a pull-out action to the seat belt based on the measured acceleration; and an orientation control mechanism used to level the base plane of the acceleration sensor, wherein the acceleration sensor includes a cover, an inertial ball, and a housing; The inertia ball is held on the support surface of the housing; The housing includes an oscillation shaft extending in the left-right direction of the vehicle, and is held in the cover by the oscillation shaft so as to be rotatable in the front-rear direction.

Description

Seat belt device {SEAT BELT DEVICE}

The present invention relates to a vehicle safety device, in particular a seat belt device.

A vehicle seat belt is a safety device. Seat belts are used to retain occupants during a crash, and to avoid secondary collisions between occupants and the steering wheel, dashboard, etc. during a crash, or to prevent occupants from being thrown out of the vehicle during a crash, resulting in death or injury. used for A vehicle seat belt may also be referred to as a seat safety belt, and is an occupant restraint device. Such seat belts are generally recognized as the lowest cost and most effective safety device, and in many countries it is compulsory to have a seat belt mounted on a vehicle.

The seat belt apparatus includes a seat belt and a seat belt retractor for winding the seat belt. During a vehicle collision or the like, when the horizontal acceleration of the vehicle is greater than a specified value, the acceleration is measured by the acceleration sensor, and thus the locking mechanism is triggered to perform an operation so that the seat belt cannot be pulled out. The acceleration sensor includes an inertial body (typically an inertia ball).

The seatback of the existing seat is movable, providing the occupant with a comfortable angle for seating. Therefore, when a seat belt retractor including the above acceleration sensor is mounted on the seatback, the orientation of the seat belt retractor is determined such that the mounted acceleration sensor accurately accurately calculates the acceleration without being affected by the angle of the movable seatback of the seat. To be able to measure, it needs to be adjusted according to the angle of inclination of the seatback.

Further, in order to ensure that the seat belt can be pulled out smoothly, the angle for mounting the seat belt retractor with respect to the seatback in the left and right directions of the vehicle depends on the type of vehicle, specifications of the vehicle's seat, and the like.

Therefore, in order to adjust the acceleration sensor to have an orientation toward the vertical direction, it is necessary to consider the angle for mounting the seat belt device in the front-rear direction of the vehicle and the left-right direction of the vehicle. In order to ensure that the acceleration sensor always maintains its orientation toward the vertical direction, the existing seat belt device is provided with a dedicated orientation adjustment component, and most parts within the orientation adjustment element are of different design when used for the left seat or right seat need to have Therefore, there is a demand for a seat belt device having a small number of parts and good compatibility.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a seat belt device having a small number of parts and good compatibility.

The present invention provides a seat belt device, the seat belt device comprising:

a seat belt retractor mounted on the seat back of the seat and inclined to the left or right by a predetermined angle with respect to the vertical direction of the seat back, and winding the seat belt when necessary; and

a rope belt advancing and retracting mechanism having a rope belt, wherein the rope belt is capable of advancing or retracting a corresponding distance depending on the angle of rotation of the seatback with respect to the seat cushion of the seat;

seat belt retractor,

an acceleration sensor used to measure the acceleration of the vehicle in the front-rear direction, wherein the seat belt retractor locks a pull-out operation to the seat belt based on the measured acceleration; and

an orientation control mechanism used to level the base plane of the accelerometer;

wherein the acceleration sensor includes a cover, an inertial ball, and a housing; The inertia ball is held on the support surface of the housing; the housing includes a rocking shaft extending in a left-right direction of the vehicle, and is held in the cover by the rocking shaft so as to be rotatable in the front-rear direction;

The orientation control mechanism includes a rotation member and a rotation transmission member; the rotating member rotates based on a corresponding distance to which the rope belt advances or retracts, and the rotation transmitting member transmits the rotation of the rotating member to the acceleration sensor so that the acceleration sensor swings in the forward and backward directions by the swinging shaft;

here,

the rotating member includes a rotating shaft, and the spherical center of the inertia ball is disposed on an axis of the rotating shaft;

the rotation transmission member includes a first contact portion and a second contact portion respectively disposed on the rotation member and the housing; The first contact portion and the second contact portion define a transmission contact point, and a straight line determined by the transmission contact point and the spherical center is perpendicular to the axis of the rotating shaft.

According to an embodiment of the present invention, the cover comprises a first side portion and a second side portion opposite to each other; the first side portion and the second side portion are respectively provided with support holes used for supporting the swing shaft, and the first side portion is further provided with a protruding portion; The protruding portion is configured to extend into a recess on the rotating member for supporting the rotating member, and a contact point defined by the protruding portion and the recess is located on an axis of a rotating shaft of the rotating member.

According to one embodiment of the present invention, the rotating shaft is disposed on one end side of the rotating member; a vertically extending arm portion is provided on the other end side of the rotating member; An end portion of the arm portion is configured as a first contact portion, and the housing is provided with a second contact portion used to contact the first contact portion.

According to one embodiment of the present invention, the orientation control mechanism comprises a pulley transferably connected to the rotating member, the pulley being provided with a winding groove for the rope belt; The winding groove includes an arc-shaped section centered at the center of the pulley.

According to an embodiment of the invention, the other side of the housing opposite the support surface is provided with support legs, the second contact portion being arranged on the support legs.

According to one embodiment of the invention, a through hole is provided in a part of the housing between the two support legs.

According to an embodiment of the present invention, the acceleration sensor further includes a moving member, the moving member being linked to the movement of the inertia ball in the front-rear direction so that the pull-out action with respect to the seat belt is locked by the locking mechanism.

According to an embodiment of the present invention, the moving member comprises a first sensor lever; A first sensor lever is rotatably held on the housing in a fore-and-aft direction and is linked to the housing by an inertial ball.

According to an embodiment of the present invention, the movable member further comprises a second sensor lever, the second sensor lever having a lower abutting portion abutting the first sensor lever and an upper abutting portion abutting the locking mechanism. include

According to one embodiment of the present invention, the locking mechanism includes a ratchet, and the first sensor lever is provided with a rib portion used to abut the lower abutment portion; the upper abutting portion and the lower abutting portion of the second sensor lever are configured to be grip portions; The pawl of the ratchet is used to abut the upper abutment portion.

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the accompanying drawings, like reference numerals denote like elements, where
1(a) to 1(c) schematically show a seat belt device according to an embodiment of the present invention mounted on a seat;
Fig. 2 schematically shows an exploded view of a seat belt device according to an embodiment of the present invention;
Fig. 3 schematically shows a seat belt device according to an embodiment of the present invention mounted on a left seat when viewed from the front of a vehicle;
Fig. 4 schematically shows a seat belt arrangement according to an embodiment of the present invention mounted on a right seat when viewed from the front of a vehicle;
5A and 5B respectively schematically show a housing in a seat belt device according to an embodiment of the present invention;
6 schematically shows the movement trajectories of some points in the seat belt device according to an embodiment of the present invention.

Specific embodiments of a seat belt device according to the present invention will be described below with reference to the accompanying drawings. The following detailed description and accompanying drawings serve to illustrate the principles of the present invention. The present invention is not limited to the preferred embodiments described, and the various embodiments described herein can be used individually or in any combination. The protection scope of the present invention is defined by the claims.

Also, terms for spatial relationships (eg, "upper", "lower", "left", "right", etc.) are used to describe the relative positional relationship between one element and another element shown in the accompanying drawings. do. Accordingly, when used, terms for spatial relationships may be applied in different directions than those shown in the accompanying drawings. Obviously, although all these terms for spatial relationships refer to the directions shown in the accompanying drawings for ease of description, one of ordinary skill in the art will understand that directions other than those shown in the drawings may be used.

1(a) to 1(c) schematically show a seat belt device according to an embodiment of the present invention mounted on a seat. A seat belt device according to an embodiment of the present invention will be described later with reference to FIGS. 1A to 1C .

1 (a) to 1 (c), the seat belt device 10 according to an embodiment of the present invention is mounted on the seat back 21 of the seat 20, the seat belt retractor 10 includes a seat belt retractor 11 and a rope belt advancing and retracting mechanism 12 . The seat belt retractor 11 can wind up the seat belt 30 , and the seat belt retractor 11 is mounted on the seat back 21 of the seat 20 , with respect to the vertical direction of the seat back 21 . It is inclined to the left or right by a predetermined angle (as shown in Figs. 1(b) and 1(c)). The rope belt advancing and retracting mechanism 12 is arranged on the connecting portion 23 , the connecting portion 23 rotatably connecting the seatback 21 and the seat cushion 22 of the movable seat 20 . Further, the rope belt advancing and retracting mechanism 12 has a rope belt 1210 , the rope belt 1210 having a corresponding distance according to the rotation angle of the seatback 21 with respect to the seat cushion 22 of the seat 20 . It is possible to advance or retreat as much as possible. In other words, depending on the angle of inclination of the seatback 21 with respect to the seat cushion 22, the rope belt 1210 only advances or retracts according to the required length, so that the inclination and movement of the seatback 21 is to the rope belt 1210. to be transmitted to the seat belt retractor 11 by the Accordingly, it is ensured that the seat belt device 10 can hold the occupant in the vehicle against the seatback 21 when there is a vehicle collision.

The seat belt retractor 11 inclines and moves at an arbitrary angle in the front-rear direction of the vehicle according to the inclination angle of the seat back 21 with respect to the seat cushion 22 . In addition, in order to smoothly take out the seat belt 30 from the seat belt retractor 11 in the left-right direction of the vehicle (that is, the width direction of the vehicle), mounting at the specified angle a is dependent on the type and seat of the vehicle. It depends on the specifications of the belt. According to one embodiment of the present invention, the standard mounting orientation of the seat belt retractor 11 is a slight inclination towards the rear of the vehicle by 15° (a rearward inclination by 15°) and at the same time, only at a specified angle (a ) (= 15°) inclination toward the width of the vehicle; This will be described in detail below with reference to Figs. 1(b) and 1(c).

It should be noted that the seat 20 and seat belt device 10 in Figs. 1(b) and 1(c) are viewed from the rear of the vehicle. As shown in FIG. 1( b ), when viewed from the rear, the seat belt device 10 on the left seat 20 is tilted to the left only by a specified angle a (= 15°) and the seat back 21 is mounted on top As shown in FIG. 1( c ), when viewed from the rear, the seat belt device 10 on the right seat 20 tilts to the right only by a specified angle a (= 15°) and the seat back 21 . mounted on top

2 schematically shows an exploded view of a seat belt device according to an embodiment of the present invention. The structure of a seat belt device according to an embodiment of the present invention will be described later with reference to FIG. 2 .

As shown in FIG. 2 , the seat belt device 10 includes a seat belt retractor and a rope belt forward and retract mechanism, and the seat belt retractor includes an acceleration sensor 110 and an orientation control mechanism 120 . .

The acceleration sensor 120 is used to measure the acceleration of the vehicle in the front-rear direction, and the seat belt retractor locks a pull-out operation to the seat belt based on the measured acceleration.

The orientation control mechanism 120 is used to keep the base plane of the acceleration sensor 110 horizontal. Specifically, the seat belt retractor 11 includes a retractor frame 130 . The retractor frame 130 is inclined in the left and right direction of the vehicle with respect to a straight line extending in the vertical direction of the seat back 21 , and is fixed on the seat back 21 . A winding shaft (not shown) used to wind up the seat belt 30 is rotatably supported on the retractor frame 130 . The axial end of the winding shaft is connected to a retractor spring. The retractor spring is used to apply a force to the take-up shaft in the take-up direction of the seat belt 30 to rotate the take-up shaft. The other axial end of the winding shaft is provided with a control disk 131 , an acceleration sensor 110 , and an orientation control mechanism 120 . The control disk 131 is part of the locking mechanism and is used to lock the pull-out operation to the seat belt 30 . The control disk 131 is for example a ratchet, and the control disk 131 is accommodated in the steering wheel cover 132 . Further, the entire side surface of the end side of the seat belt retractor 11 including the acceleration sensor 110 is covered by the retractor cover 134 . The acceleration sensor 110 measures the acceleration acting on the vehicle in the front-rear direction, and activates the locking mechanism according to the measured acceleration. The orientation control mechanism 120 is used to always keep the base plane of the acceleration sensor 110 almost horizontal regardless of any change in the inclination and movement angle of the seatback 21 .

During mounting, the control disk 131 is allowed to rotate with the winding shaft. At the same time, a plurality of engagement grippers are provided on the outer peripheral surface of the control disk 131 . The engaging grippers are engaged with an upper abutting portion (eg, configured to be in the form of a grip portion) of a moving member (first sensor lever) to be described later, and are arranged circumferentially at specified intervals.

Fig. 3 schematically shows a seat belt device according to an embodiment of the present invention mounted on a left seat when viewed from the front of a vehicle; The following description is provided with reference to FIG. 3 .

3 , the acceleration sensor 110 includes a cover 111 , an inertia ball 112 , and a housing 113 .

The inertia ball 112 is held on the support surface of the housing 113 . The support surface is the upper surface of the housing 113 in FIG. 3 , and the upper surface is the recessed surface. When subjected to an acceleration equal to or greater than the specified speed in the front-rear direction of the vehicle, the inertia ball 112 shifts from the neutral position and measures the acceleration acting on the vehicle (ie, the seat belt retractor 11 ). Also, a near-horizontal support surface refers to a base plane of the support surface in a generally horizontal direction.

The housing 113 includes a swing shaft 1131 extending in the left and right direction of the vehicle, and the housing 113 is held in the cover 111 by the swing shaft 1131 so as to be rotatable in the front-rear direction of the vehicle.

The cover 111 is fixed to the outer surface of the retractor frame 130 , and is inclined and moved in the front-rear direction of the vehicle together with the seat back 21 .

It can be understood that the housing 113 is centered on the swing shaft 1131 in the left-right direction of the vehicle, and the housing is supported in such a way that it can freely swing with respect to the cover 111 in the front-rear direction of the vehicle. When the seatback 21 is inclined and moved, the housing 113 rotates with respect to the cover 111 in the front-rear direction of the vehicle. Accordingly, in the front-rear direction of the vehicle, the support surface of the inertia ball serving as the base plane of the sensor remains substantially horizontal. In addition, the acceleration sensor 110 further includes a moving member. The moving member is linked to the movement of the inertia ball 112 in the fore-and-aft direction of the vehicle, such that the pull-out action to the seat belt 30 is locked by the locking mechanism. Specifically, the moving member includes the first sensor lever 1141 . The first sensor lever 1141 is rotatably maintained on the housing 112 in the fore-and-aft direction of the vehicle, and is linked to the housing 113 by an inertia ball 112 . In addition, the movable member further includes a second sensor lever 1142 , wherein the second sensor lever 1142 has a lower abutment portion (eg, in the form of a grip portion) abutting the first sensor lever 1141 and and an upper abutment portion abutting the locking mechanism. When the acceleration in the horizontal direction acting on the vehicle is greater than the specified value, the inertia ball 112 serves as an inertial body and shifts from the neutral position; The first sensor lever 1141 of the moving member is linked when the inertia body 112 shifts in the front-rear direction of the vehicle, and the link is transmitted to the locking mechanism by the second sensor lever 1142, so that the locking mechanism is secured to the seat Make sure to perform the action on the side to lock the pull-out action on the belt.

According to one embodiment of the invention, the control disk of the locking mechanism is configured as a ratchet. Also, the first sensor lever 1141 is provided with a rib portion used to abut the lower abutting portion of the second sensor lever 1142 (ie, the two upper protruding portions of the first sensor 1141 in FIG. 3 ). and the upper abutment portion and the lower abutment portion of the second sensor 1142 are configured as grip portions. The detent of the ratchet is used to abut the upper abutting portion of the second sensor lever.

2 and 3 , the orientation control mechanism 120 includes: a first pulley casing 123 and a second pulley casing 126 housed within the retractor frame 130 ; a pulley 124 accommodated in an inner space defined by the first pulley casing 123 and the second pulley casing 126; Rotational member 121 and rotational transmission member 122, wherein rotational member 121 rotates rotational transmission member 122 based on a corresponding distance through which the rope belt 1210 advances or retracts, and rotates the rotational transmission member ( 122) is used to transmit the rotation of the rotation member 121 to the acceleration sensor 110 (specifically, the housing 113) so that the acceleration sensor 110 swings in the front-rear direction of the vehicle by the swing shaft 1131 - ; and a torsion spring 125 for applying a force to the pulley 124 for rotation.

The pulley 124 is centered on a support shaft provided on the first pulley casing 123 so that the pulley 124 can rotate freely between the first pulley casing 123 and the second pulley casing 126 in such a way that the pulley 124 can rotate freely. ) to be supported on the The pulley 124 converts the advancing and retracting of the rope belt 1210 of the rope belt advancing and retracting mechanism 12 into rotational motion, and only the seatback 21 according to the angle corresponding to the advancing and retracting of the rope belt 1210. ) rotates in the same direction as the inclination direction.

The torsion spring 125 applies a force to the pulley 124 in the winding direction of the rope belt 1210 for rotation. Also, the rotating member 121 may be in the form of an adjustment gear. The adjustment gear meshes with the gear formed on the side portion of the pulley 124 and synchronously rotates at the same rotational angle in a direction opposite to the inclination direction of the seatback 21 . The rotating member 121 inserts the protruding portion on one end side (ie, the protruding portion on the left end side shown in FIG. 3 ) into the support hole of the first pulley casing 123 , and the left side portion of the cover 111 . The protruding portion of the phase is inserted into a recess on the other segment side of the rotating member 121 (ie, the right end side of the rotating member 121 in FIG. 3 ). Accordingly, the rotation member 121 is supported and may rotate about the axis L2 . In other words, the protruding portion on the left end side of the rotating member 121 in FIG. 3 forms the rotating shaft of the rotating member 121 . In addition, the cover 111 includes a first side portion and a second side portion opposite to each other. Support holes used to support the swing shaft 1131 are provided in the first side portion and the second side portion, respectively, and the protruding portion on the first side portion of the cover 111 is spaced apart from the support hole.

As shown in FIG. 3 , the arm portion 1212 extending vertically is provided on the other end side (ie, the right end side) of the rotating member 121 . It should be noted that extending vertically herein refers to the arm portion being perpendicular to the plane in which the rotation of the rotating member is performed. An end portion of the arm portion 1212 is configured to be a first contact portion, and the housing 113 is provided with a second contact portion used to contact the first contact portion. The rotation transmission member 122 includes the aforementioned first contact portion and the second contact portion respectively disposed on the rotation member 121 and the housing 113 .

In one example, as shown in FIG. 5A , a support leg 1132 is provided on the other side of the housing 113 opposite the support surface, and the second contact portion is disposed on the support leg 1132 . More specifically, the second contact portion is the flat inner side surface of the support leg 1132 . Also, as shown in Figs. 3 and 4, when mounted on the left seat or right seat of the vehicle, the contact portions are located at positions indicated by the portion 1132A and the portion 1132B in Fig. 5A, respectively. . Correspondingly, a spherical first contact portion (observable from FIG. 4 ) contacts (more specifically, point-contacts) the flat inner side surfaces of the support legs 1132 at portions 1132A and 1132B. . Also, as shown by way of example in FIG. 5A , a through hole is provided in a portion of the housing 113 between the two support legs 1132 , the through hole facilitating the discharge of debris. However, this is only an example; The respective shapes of the first contact portion and the second contact portion are not limited thereto, and may be configured to be different from those illustrated in FIG. 5A . For example, as shown in FIG. 5B , the first contact portion may be configured to be in the form of a cylinder, and the second contact portion to be disposed on the support leg 1132 ′ having an arc-shaped inner side surface. can More specifically, the second contact portion is an arc-shaped inner lateral surface of the support leg 1132 ′, and the cylindrical first contact portion is formed with an arc-shaped inner lateral surface of the support leg 1132 ′ (more specifically , by point contact).

In this case, by bringing the first contact portion of the rotation transmission member 122 disposed on the arm portion 1212 into contact with the second contact portion disposed on the housing 113 , the rotation transmission mechanism 122 may be configured to operate the rotation member Even if the rotation shaft L2 of the 121 and the swing shaft L1 of the housing 113 have an arbitrary angular relationship, the rotation of the rotation member 121 is transmitted to the housing 113 so that the housing 113 is oscillated. can do. Accordingly, the rotation transfer mechanism 122 causes the sensor baseline of the acceleration sensor 30 to point perpendicular to the fore-and-aft direction of the vehicle in order to keep the support surface of the inertia ball substantially horizontal, and the support surface of the inertia ball is the sensor base It serves as the base plane of the sensor perpendicular to the line.

The seat belt retractor 11 having the above structure has standard mounting orientations depending on the type of vehicle and the specification of the seat. For example, the seat belt retractor is mounted on the seatback 21 with the seat belt retractor inclined slightly rearward by 15° in the vehicle and at the same time a = 15° in the width direction of the vehicle (left-right direction). do. The reason that the seat belt retractor 11 is mounted at different inclination directions and at different angles in the width direction of the vehicle according to the type of vehicle and specifications of the seat is that the inclination of the take-up shaft toward the width direction of the vehicle causes the seat belt 30 This is because it is necessary to ensure that it can be pulled smoothly by matching the withdrawal direction of ).

Accordingly, the rotation member 121 and its rotation axis L2 inclined by a predetermined angle with respect to the horizontal direction and the swing axis L1 of the housing 113 kept in the horizontal direction are not on the same straight line, but between the two axes. The angle (a) specified in is constructed.

It should be understood that it is necessary to ensure that the angle of inclination of the seatback 21 and the angle of rotation of the housing 113 (the direction of inclination and movement of the seatback and the angle of reverse rotation of the housing) are precisely synchronized with each other. If it is not ensured that the rotation angle of the seatback 21 and the rotation angle of the housing 113 are accurately synchronized with each other, the support surface of the inertia ball cannot be accurately maintained horizontally, so that the acceleration sensor 110 cannot operate correctly. none. For example, assuming that the rotational orbital planes of both the rotational member 121 and the housing 113 are parallel to each other and their respective axes (rotation axis L2 and oscillation axis L1) are on the same straight line, When the rotating member 121 and the housing 113 rotate, the position of the contact point between the first contact portion and the second contact portion is the same and does not change, so the trajectory of the contact point is a perfect circle. However, when the rotational orbital planes of both the rotational member 121 and the housing are not parallel to each other, the position of the contact point may change in a radial direction according to the rotational angle, and thus the orbit of the contactpoint is non-circular (elliptical) can be

In order to ensure that the rotation angle of the seatback 21 and the rotation angle of the housing 113 are synchronized with each other, the seat belt retractor according to the present invention is configured as follows: the spherical center A of the inertia ball 112 . is disposed on the axis L2 of the rotating shaft of the rotating member 121 , the transfer contact point C defined by the first contact portion and the second contact portion, and the spherical center A of the inertia ball 113 . The straight line determined by is perpendicular to the axis L2 of the rotation shaft of the rotation member 113 . 3 and 4 respectively show seat belt devices according to an embodiment of the present invention respectively mounted on a left seat and a right seat when viewed from the front of a vehicle, both of which have the aforementioned configurations according to the present invention. show clearly The principles of the present invention will be explained in more detail below.

6 schematically shows movement trajectories of some points in a seat belt device according to an embodiment of the present invention. The following will continue to describe a seat belt device according to the present invention with reference to FIG. 6 .

6 shows movement trajectories of four points. In addition to the aforementioned spherical center A of the inertia ball 113 and the transfer contact point C defined by the first and second contact portions, for simplicity of explanation, points B and D are is chosen The point B is a contact point between the cover 111 and the rotating member 121 and is located on the axis of the rotating shaft of the rotating member 121, and the point D is the points A, B, C and Points that together form a rectangle. That is, the point D is a point on a plane in which the rotation of the rotating member 121 is performed. It should be noted that the point D may be a point on the rotating member 121 , for example an end point of the arm portion 1212 , or an imaginary point.

When the rotation member 121 rotates, the point C and the point D are at an angle (eg, FIG. 6 ) around the rotation axis L2 (ie, the straight line AB) of the rotation member 121 . rotated by 90 degrees as shown in Fig. Taking into account the fixed positional relationship between the points A, B, C and D, that is to say, a straight line AB collinear with the axis L2 and a straight line AC perpendicular to the straight line AB In consideration, the angle at which the straight line BD rotates is an angle at which the rotating member 121 rotates, and similarly, the angle at which the straight line AC rotates is an angle at which the housing 113 rotates.

By research and analysis, the inventor of the present application considers that the desynchronization between the rotation angle of the seatback and the rotation angle of the housing is mainly caused by two factors: one factor is the rotation axis of the rotation member and the rotation axis of the housing There is an angle therebetween, another factor being the placed positions of the transfer contact point and the spherical center of the inertia ball. Since the first factor certainly exists and cannot be altered, the present application focuses on the second factor. In addition, a study was conducted on how the second factor affects the desynchronization between the rotation angle of the seatback and the rotation angle of the housing. Conclusions of the study are provided below.

In order to facilitate understanding of the present invention, designs based on the present invention are compared to designs not based on the present invention. Specifically, as a comparison, FIG. 6 further shows point A′. Unlike the seat belt retractor according to the present invention, the point A' is not arranged on the rotational axis L2 of the rotating member. Accordingly, the angle at which the straight line A'C rotates is the angle at which the housing rotates. It can be clearly observed that the angle at which the straight line A'C rotates is different from the angle at which the straight line BD rotates, indicating that the angle at which the rotating member rotates is different from the angle at which the housing rotates. Accordingly, the rotation angle of the seatback and the rotation angle of the housing cannot be synchronized with each other.

Accordingly, in the seat belt apparatus according to the present invention, the seat belt retractor is configured as follows: the spherical center of the inertia ball is disposed on the axis of the rotation shaft of the rotating member, and is at the first contact portion and the second contact portion The straight line determined by the transfer contact point defined by and the spherical center of the inertia ball is perpendicular to the axis of the rotating shaft of the rotating member. Accordingly, synchronizing the rotation angle of the seatback and the rotation angle of the housing with each other can be achieved, and there is no need to provide a compensation mechanism for desynchronization between the rotation angle of the seatback and the rotation angle of the housing. Furthermore, by the structural design and mounting dimensions of each part, it can be ensured that the aforementioned spherical center and the transfer contact point of the seat belt retractor according to the present invention are located at predetermined positions, so that no part is positioned no need to do Accordingly, the seat belt device according to the present invention has fewer parts.

Further, in comparison with the prior art in which the above-described compensation mechanism is configured as a winding groove having a variable radius on the pulley, in the seat belt device according to the present invention, the pulley is provided with a winding groove for the rope belt, and the winding groove is the winding groove of the pulley. It contains an arc-shaped section centered at the center. Thus, the design of the pulley for the left seat need not be distinct from the design of the pulley for the right seat. The pulley of the seat belt device according to the present invention adopts the same design for the left seat and the right seat. Similarly, the retractor frame, the housing and the second sensor lever of the seat belt device according to the present invention may adopt the same design for the left seat and the right seat, respectively. Therefore, the seat belt device according to the present invention has good compatibility.

As described above, exemplary embodiments of the present invention have been described with reference to the accompanying drawings within the description, however, the present invention is not limited to the specific embodiments described above, and the protection scope of the present invention is defined by the claims and their equivalent meanings. should be

Claims (10)

A seat belt device (10) comprising:
A seat belt retractor mounted on the seat back 21 of the seat 20 and inclined to the left or right by a predetermined angle with respect to the vertical direction of the seat back 21 to wind up the seat belt 30 when necessary. retractor) (11); and
Rope belt advancing and retracting mechanism 12 with rope belt 1210 - the rope belt 1210 having a corresponding distance depending on the angle of rotation of the seatback 21 with respect to the seat cushion 22 of the seat 20 capable of advancing or retreating by
The seat belt retractor 11 is
Acceleration sensor 110 used to measure the acceleration of the vehicle in the front-rear direction - The seat belt retractor 11 performs a pull-out operation on the seat belt 30 based on the measured acceleration lock -; and
an orientation control mechanism (120) used to level the base plane of the acceleration sensor (110);
the acceleration sensor 110 includes a cover 111 , an inertia ball 112 , and a housing 113 ; the inertia ball 112 is held on the support surface of the housing 113; The housing 113 includes a rocking shaft 1131 extending in the left-right direction of the vehicle, and is held in the cover 111 by the rocking shaft 1131 so as to be rotatable in the front-rear direction, ;
the orientation control mechanism 120 includes a rotation member 121 and a rotation transmission member 122; The rotating member 121 rotates based on the corresponding distance to which the rope belt 1210 advances or retracts, and the rotation transmitting member 122 is configured such that the acceleration sensor 110 is connected to the oscillation shaft 1131 . transmits the rotation of the rotation member 121 to the acceleration sensor 110 to swing in the front-rear direction by
the rotating member 121 includes a rotating shaft 1211, the spherical center A of the inertia ball 112 is disposed on the axis L2 of the rotating shaft 1211;
the rotation transmission member 122 includes a first contact portion and a second contact portion respectively disposed on the rotation member 121 and the housing 113; The first contact portion and the second contact portion define a transmission contact point C, and the straight line determined by the transmission contact point C and the spherical center A is the axis of the rotation shaft 1211 . perpendicular to (L2), the seat belt device (10). 2. The method according to claim 1, wherein the cover (111) comprises a first side portion and a second side portion opposite to each other; the first side portion and the second side portion are respectively provided with support holes used for supporting the swing shaft 1131, and the first side portion is further provided with a protruding portion; The protruding portion is configured to extend into a recess on the rotating member 121 to support the rotating member 121 , and a contact point defined by the protruding portion and the recess is a contact point of the rotating member 121 . A seat belt arrangement (10), located on the axis (L2) of the rotating shaft (22). 3. The method according to claim 2, wherein: the rotating shaft (1211) is disposed on one end side of the rotating member (121); an arm portion 1212 extending vertically is provided on the other end side of the rotating member 121; an end portion of the arm portion 1212 is configured as the first contact portion, and the housing 113 is provided with the second contact portion used to contact the first contact portion. ). 4. The method of claim 3, wherein the orientation control mechanism (1) comprises a pulley (124) transferably connected to the rotating member (121), the pulley (124) having a fork for the rope belt (1212). a winding groove is provided; The winding groove comprises an arc-shaped section centered at the center of the pulley (124). The other side of the housing (113) opposite the support surface according to claim 4, wherein support legs (1132, 1132') are provided, and the second contact part is the support legs (1132). , 1132'). The seat belt device (10) according to claim 5, wherein a portion of the housing (113) between the two support legs (1132, 1132') is provided with a through hole. 7. The inertial ball according to claim 6, wherein the acceleration sensor (110) further comprises a moving member, the moving member in the front-rear direction so that the pull-out operation with respect to the seat belt (30) is locked by a locking mechanism. A seat belt device (10) linked to movement of (112). 8. The method of claim 7, wherein: the moving member comprises a first sensor lever (1141); The first sensor lever (1141) is rotatably held on the housing (113) in the front-rear direction, and is linked to the housing (113) by the inertia ball (112). 9. The method of claim 8, wherein the moving member further comprises a second sensor lever (1142), the second sensor lever (1142) comprising: a lower abutting portion abutting the first sensor lever (1141); and an upper abutment portion abutting the locking mechanism. 9. The method according to claim 8, wherein the locking mechanism (22) includes a ratchet, and the first sensor lever (1141) is provided with a rib portion used to abut the lower abutment portion; the upper abutting portion and the lower abutting portion of the second sensor lever 1142 are configured to be grip portions; and a pawl of the ratchet is used to abut the upper abutment portion.

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