Seat belt arrangement

Abstract

The present invention relates to a safety belt device. The safety belt device includes a safety belt retractor mounted on a seat back and inclined leftward or rightward by a certain angle with respect to an up-and-down direction of the seat back, and winding a safety belt when necessary, and a webbing advance-and-retreat mechanism having a webbing capable of advancing or retreating by a corresponding distance according to an angle at which the seat back turns with respect to a seat cushion of the seat. The safety belt retractor includes an acceleration sensor for detecting an acceleration of a vehicle in a front-and-rear direction, and locking an extraction motion of the safety belt based on the detected acceleration, and a posture control mechanism for maintaining a reference plane of the acceleration sensor horizontal, wherein the acceleration sensor includes a cover, an inertial ball, and a housing, the inertial ball is held on a support plane of the housing, the housing includes a rocking shaft extending along a left-and-right direction of the vehicle, and is held in the cover in a turnable manner in the front-and-rear direction via the rocking shaft.

Description

TECHNICAL FIELD

[0001] The present application relates to a safety device for a vehicle, and particularly to a seat belt device. BACKGROUND

[0002] A seat belt for a vehicle is a safety device for restraining an occupant at the time of a collision and avoiding a secondary collision of the occupant with a steering wheel, an instrument panel, or the like at the time of a collision or a collision of the occupant with the outside of a vehicle at the time of a collision. The seat belt for a vehicle, which is also called a seat belt harness, is one type of occupant restraint device. The seat belt is recognized as the most inexpensive and effective safety device, and in many countries, the installation of a seat belt is mandatory in the equipment of a vehicle.

[0003] A seat belt device includes a seat belt and a seat belt retractor that winds the seat belt. At the time of a collision of a vehicle or the like, when an acceleration in a horizontal direction of the vehicle is greater than a predetermined value, the acceleration is detected by an acceleration sensor, and thus the operation of a lock mechanism is triggered to make it impossible to pull out the seat belt. The acceleration sensor includes an inertial body (typically, an inertial ball).

[0004] It is known that a seat back of a seat is movable to provide a more comfortable seating angle for an occupant. Therefore, when a seat belt retractor including the above-described acceleration sensor is mounted on the seat back, it is necessary to adjust the posture of the seat belt retractor according to the inclination angle of the seat back to ensure that the acceleration sensor after the mounting is not affected by the angle of the movable seat back of the seat and accurately detects the acceleration.

[0005] Furthermore, in order to ensure that the seat belt can be smoothly pulled out, the mounting angle of the seat belt retractor with respect to the seat back in the left-right direction of the vehicle is different according to the type of the vehicle, the seat style of the vehicle, or the like.

[0006] Therefore, in order to adjust the posture of the acceleration sensor to be directed toward the vertical direction, it is necessary to consider the mounting angle of the seat belt device in the front-rear direction of the vehicle and the mounting angle of the seat belt device in the left-right direction of the vehicle. In order to satisfy the posture of the acceleration sensor to be always directed toward the vertical direction, a dedicated posture adjustment member is provided in the conventional seat belt device, and most of the parts in the posture adjustment member need to be designed differently when used for the left and right seats. Therefore, a seat belt device with fewer parts and good versatility is desired. SUMMARY

[0007] An object of the present application is to provide a seat belt device with fewer parts and good versatility.

[0008] The present application provides a seat belt device including:

[0009] A seat belt retractor is installed on a seat back of a seat and is inclined at an angle to the left or right with respect to the up-and-down direction of the seat back, and winds a seat belt when necessary.

[0010] A cord advancing / retracting mechanism has a cord that advances or retracts by a corresponding distance according to the angle at which the seat back turns with respect to the seat cushion of the seat;

[0011] The seat belt retractor includes:

[0012] An acceleration sensor for detecting acceleration of a vehicle in a front-and-rear direction, and the seat belt retractor locks the extraction action of the seat belt based on the detected acceleration; and

[0013] A posture control mechanism for maintaining the reference plane of the acceleration sensor horizontal;

[0014] The acceleration sensor includes a cover, an inertial ball, and a housing, the inertial ball is held on a support plane of the housing, the housing includes a rocking shaft that extends in the left-and-right direction of the vehicle and is held in the cover in a turnable manner in the front-and-rear direction via the rocking shaft;

[0015] The posture control mechanism includes a rotating member that rotates based on the corresponding distance by which the cord advances or retracts, and a rotation transmission member that transmits the rotation of the rotating member to the acceleration sensor to rock the acceleration sensor in the front-and-rear direction via the rocking shaft;

[0016] The rotating member includes a rotation shaft, and the ball center of the inertial ball is disposed on the axis of the rotation shaft; and

[0017] The rotation transmission member includes a first contact portion and a second contact portion disposed on the rotating member and the housing, respectively, the first contact portion and the second contact portion define a transmission contact point, and the straight line determined by the ball center and the transmission contact point is perpendicular to the axis of the rotation shaft.

[0018] According to an embodiment of the present application, the cover includes opposite first and second side portions, the first and second side portions are respectively provided with support holes for supporting the rocking shaft, and the first side portion is further provided with a protruding portion configured to extend into a groove on the rotating member to support the rotating member, and the contact point defined by the protruding portion and the groove is located on the axis of the rotation shaft of the rotating member.

[0019] According to an embodiment of the present application, the cover includes opposite first and second side portions, the first and second side portions are respectively provided with support holes for supporting the rocking shaft, and the first side portion is further provided with a protruding portion configured to extend into a groove on the rotating member to support the rotating member, and the contact point defined by the protruding portion and the groove is located on the axis of the rotation shaft of the rotating member.

[0020] According to an embodiment of the present application, the rotation axis is provided at one end side of the rotation member, a vertically extending arm portion is provided at the other end side of the rotation member, an end portion of the arm portion is provided as a first contact portion, and a second contact portion for contacting the first contact portion is provided on the housing.

[0021] According to an embodiment of the present application, the posture control mechanism includes a pulley for transmission connection with the rotation member, and a winding groove for the rope belt is provided on the pulley, the winding groove including a circular arc-shaped section centered on the center of the pulley.

[0022] According to an embodiment of the present application, a leg is provided on the other side of the housing opposite to the support surface, and the second contact portion is provided on the leg.

[0023] According to an embodiment of the present application, a through hole is provided on the portion of the housing between the two legs.

[0024] According to an embodiment of the present application, the acceleration sensor further includes an action member linked with the movement of the inertial ball toward the front-rear direction, so that the extraction action of the safety belt is locked by a locking mechanism.

[0025] According to an embodiment of the present application, the action member includes a first sensor lever rotatably held on the housing in the front-rear direction and linked with the housing via the inertial ball.

[0026] According to an embodiment of the present application, the action member further includes a second sensor lever including a lower abutting portion abutting against the first sensor lever and an upper abutting portion abutting against the locking mechanism.

[0027] According to an embodiment of the present application, the locking mechanism includes a ratchet, and the first sensor lever is provided with a rib portion for abutting against the lower abutting portion, the upper abutting portion and the lower abutting portion of the second sensor lever are provided as a gripper portion, and a pawl of the ratchet is used for abutting against the upper abutting portion. BRIEF DESCRIPTION OF DRAWINGS

[0028] The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings. In the drawings, the same symbols indicate the same elements, in which:

[0029] Figures 1(a)-1(c) A safety belt device according to an embodiment of the present application is schematically shown as installed on a seat.

[0030] Figure 2 An exploded view of a safety belt device according to an embodiment of the present application is schematically shown.

[0031] Figure 3 A safety belt device according to an embodiment of the present application installed on a left seat is schematically shown as viewed from the front of a vehicle.

[0032] Figure 4 A safety belt device according to an embodiment of the present application installed on a right seat is schematically shown as viewed from the front of a vehicle.

[0033] Figures 5A-5B A housing in a safety belt device according to an embodiment of the present application is schematically shown, respectively.

[0034] Figure 6 A movement locus of a part in a safety belt device according to an embodiment of the present application is schematically shown. DETAILED DESCRIPTION

[0035] Hereinafter, a specific embodiment of a safety belt device according to the present application will be described with reference to the accompanying drawings. The following detailed description and drawings are provided to illustrate the principles of the present application by way of example only, which is not limited to the preferred embodiments described, and the various embodiments described herein can be used alone or in any combination. The scope of the present application is defined by the claims.

[0036] Further, spatially relative terms, such as "upper", "lower", "left" and "right", and the like, are used to describe the relative position relationship between elements shown in the drawings. Therefore, the spatially relative terms can be applied to directions different from the directions shown in the drawings. It is obvious that, although all these spatially relative terms refer to the directions shown in the drawings for ease of explanation, a person skilled in the art can understand that directions different from the directions shown in the drawings can be used.

[0037] Figures 1(a)-1(c) A seat on which a safety belt device according to an embodiment of the present application is installed is schematically shown. Hereinafter, a safety belt device according to an embodiment of the present application will be described with reference to Figures 1(a)-1(c)

[0038] As Figures 1(a)-1(c) ​As shown, the seat belt device 10 according to the embodiment of the present application is installed on the seat back 21 of the seat 20, and the seat belt device 10 includes a seat belt retractor 11 and a webbing advancing / retracting mechanism 12. The seat belt retractor 11 can wind the seat belt 30, and the seat belt retractor 11 is installed on the seat back 21 of the seat 20 and inclined at a certain angle to the up-and-down direction of the seat back 21 to the left or to the right (as shown in FIG. 1(b) and FIG. 1(c)). The webbing advancing / retracting mechanism 12 is provided on the connecting portion 23 that rotatably connects the seat back 21 and the seat cushion 22 of the movable seat 20, and the webbing advancing / retracting mechanism 12 has a webbing 1210 that can advance or retract by a corresponding distance according to the angle at which the seat back 21 is rotated with respect to the seat cushion 22 of the seat 20. In other words, according to the inclination angle of the seat back 21 with respect to the seat cushion 22, the webbing 1210 is caused to advance or retract only by the necessary length, whereby the inclination movement of the seat back 21 is transmitted to the seat belt retractor 11 through the webbing 1210. The seat belt device 10 is ensured to have a function of restraining an occupant in the vehicle with respect to the seat back 21 at the time of a collision of the vehicle.

[0039] The seat belt retractor 11 is inclined to move at an arbitrary angle in the front-and-rear direction of the vehicle according to the inclination angle of the seat back 21 with respect to the seat cushion 22. Also, in order to be able to smoothly pull out the seat belt 30 from the seat belt retractor 11 in the left-and-right direction of the vehicle (i.e., the width direction of the vehicle), the seat belt retractor 11 is installed at a respective prescribed angle a according to the type of the vehicle and the style of the seat belt. In the embodiment according to the present application, the standard installation posture of the seat belt retractor 11 is to be slightly inclined 15° to the rear of the vehicle (to be inclined 15° rearward) and to be inclined only a prescribed angle a (= 15°) to the width direction of the vehicle, which will be described in detail below with reference to FIG. 2. Figure 1(b) and 1(c) .

[0040] Note that FIG. 1(b) and FIG. 1(c) are views of the seat 20 and the seat belt device 10 as viewed from the rear side of the vehicle. As shown in FIG. 1(b), for the seat belt device 10 on the left seat 20, the seat belt device 10 is installed on the seat back 21 to be inclined only a prescribed angle a (= 15°) to the left side as viewed from the rear side; and as shown in FIG. 1(c), for the seat belt device 10 on the right seat 20, the seat belt device 10 is installed on the seat back 21 to be inclined only a prescribed angle a (= 15°) to the right side as viewed from the rear side.

[0041] Figure 2 An exploded view of the seat belt device according to the embodiment of the present application is schematically shown. The structure of the seat belt device according to the embodiment of the present application will be described below with reference to Figure 2 .

[0042] As Figure 2As shown, the safety belt device 10 includes a safety belt retractor and a belt in-out mechanism, the safety belt retractor including an acceleration sensor 110 and a posture control mechanism 120.

[0043] The acceleration sensor 120 is used to detect acceleration of the vehicle in the front-rear direction, and the safety belt retractor locks the extraction motion of the safety belt based on the detected acceleration.

[0044] The posture control mechanism 120 is used to maintain the reference plane of the acceleration sensor 110 horizontal. Specifically, the safety belt retractor 11 includes a retractor frame 130 that inclines a straight line extending in the up-down direction on the seatback 21 toward the left-right direction of the vehicle, and is fixed to the seatback 21. On the retractor frame 130, a winding shaft (not shown) for winding the safety belt 30 is rotatably supported. At one end in the axial direction of the winding shaft, a retractor spring is connected that is used to apply a force to the winding shaft in the winding direction of the safety belt 30 to rotate the winding shaft. At the other end in the axial direction of the winding shaft, a control disk 131, the acceleration sensor 110, and the posture control mechanism 120 are provided. The control disk 131 is a part of the locking mechanism for locking the extraction motion of the safety belt 30, such as a ratchet, and is housed inside a steering wheel cover 132. Also, the side surface of the end side of the safety belt retractor 11 that contains the acceleration sensor 110 is covered by a retractor cover 134. The acceleration sensor 110 detects acceleration acting in the front-rear direction of the vehicle, and based on the detected acceleration, activates the locking mechanism. The posture control mechanism 120 is used to maintain the reference plane of the acceleration sensor 110 slightly horizontal regardless of changes in the inclination moving angle of the seatback 21.

[0045] At the time of installation, the control disk 131 is caused to rotate together with the winding shaft, and on the outer peripheral surface of the control disk 131, a plurality of engagement claws are provided that engage with the upper abutting portion (for example, provided in the form of a claw portion) of the movement member (first sensor lever) described later, and are arranged at regular intervals in the circumferential direction.

[0046] Figure 3 A safety belt device according to an embodiment of the present application installed on a left seat is schematically shown as viewed from the front of the vehicle. The following description is made with reference to Figure 3 the drawing.

[0047] As shown in Figure 3 , the acceleration sensor 110 includes a cover 111, an inertial ball 112, and a housing 113.

[0048] The inertial ball 112 is held on a support surface of the housing 113 that is Figure 3The upper side surface of the middle housing 113 is a concave surface. When the inertial ball 112 is displaced from the neutral position when an acceleration above a prescribed speed is applied in the front-rear direction of the vehicle, the acceleration applied to the vehicle (i.e., the seat belt retractor 11) is detected. Also, the so-called support surface is in a slightly horizontal state, meaning that the reference surface of the support surface is in a substantially horizontal direction.

[0049] The housing 113 includes a rocking shaft 1131 extending in the left-right direction of the vehicle, and is held in the cover 111 in a rotatable manner in the front-rear direction of the vehicle via the rocking shaft 1131.

[0050] The cover 111 is fixed to the outer side of the retractor frame 130 and moves in the front-rear direction of the vehicle together with the seat back 21.

[0051] It will be appreciated that the housing 113 is supported in a freely rocking manner in the front-rear direction of the vehicle with respect to the cover 111 about the rocking shaft 1131 in the left-right direction of the vehicle. When the seat back 21 moves in the tilting manner, the housing 113 is rotated in the front-rear direction of the vehicle with respect to the cover 111, whereby the support surface of the inertial ball, which is the reference surface of the sensor, is maintained in a slightly horizontal state in the front-rear direction of the vehicle. In addition, the acceleration sensor 110 further includes an action member that is linked to the movement of the inertial ball 112 in the front-rear direction of the vehicle so that the extraction action of the seat belt 30 is locked by the locking mechanism. Specifically, the action member includes a first sensor lever 1141 that is rotatably held on the housing 112 in the front-rear direction of the vehicle and is linked to the housing 113 via the inertial ball 112. Also, the action member includes a second sensor lever 1142 that includes a lower abutting portion (e.g., in the form of a grip portion) that abuts against the first sensor lever 1141 and an upper abutting portion that abuts against the locking mechanism. When the acceleration applied to the vehicle in the horizontal direction is greater than a prescribed value, the inertial ball 112 is displaced from the neutral position as an inertial body; the first sensor lever 1141 of the action member is linked when the inertial body 112 is displaced in the front-rear direction of the vehicle and transmits the linkage to the locking mechanism via the second sensor lever 1142, so that the locking mechanism acts toward the side that locks the extraction action of the seat belt.

[0052] In one embodiment according to the present application, the control disc of the locking mechanism is configured as a ratchet, and the first sensor lever 1141 is provided with a rib portion (i.e., the two upper protruding portions of the first sensor 1141) for abutting against the lower abutting portion of the second sensor lever 1142, the upper abutting portion and the lower abutting portion of the second sensor 1142 are provided as grip portions, and the pawl of the ratchet is used to abut against the upper abutting portion of the second sensor lever. Figure 3 In one embodiment according to the present application, the control disc of the locking mechanism is configured as a ratchet, and the first sensor lever 1141 is provided with a rib portion (i.e., the two upper protruding portions of the first sensor 1141) for abutting against the lower abutting portion of the second sensor lever 1142, the upper abutting portion and the lower abutting portion of the second sensor 1142 are provided as grip portions, and the pawl of the ratchet is used to abut against the upper abutting portion of the second sensor lever.

[0053] like Figure 2 and Figure 3 As shown, the attitude control mechanism 120 includes: a first pulley housing 123 and a second pulley housing 126 housed inside the retractor frame 130; a pulley 124 housed in the internal space defined by the first pulley housing 123 and the second pulley housing 126; a rotating member 121 and a rotation transmission member 122, the rotating member 121 rotating the rotation transmission member 122 based on a corresponding distance the rope 1210 travels forward or backward, the rotation transmission member 122 transmitting the rotation of the rotating member 121 to the acceleration sensor 110 (specifically housing 113) so that the acceleration sensor 110 is rocked in the longitudinal direction of the vehicle via a rocking shaft 1131; and a torsion spring 125 that applies force to the pulley 124 to rotate it.

[0054] The pulley 124 is centered on a support shaft mounted on the first pulley housing 123, allowing it to rotate freely and be supported on both the first pulley housing 123 and the second pulley housing 126. The pulley 124 converts the forward and backward movement of the rope 1210 in the rope advance and retreat mechanism 12 into rotational motion, and rotates only in the same direction as the inclination direction of the chair back 21, according to the angle of the corresponding forward and backward movement of the rope 1210.

[0055] The torsion spring 125 applies force to the pulley 124 in the winding direction of the rope 1210 to rotate it. Furthermore, one form of the rotating member 121 is an adjuster gear that meshes with a gear formed on the side of the pulley 124, rotating synchronously in the opposite direction to the inclination direction of the chair back 21 at the same rotation angle. The rotating member 121 will... Figure 3 The protrusion on the left side shown in the diagram is embedded in the support hole of the first pulley housing 123, and the protrusion on the left side of the cover 111 is embedded in the other side of the rotating member 121 (i.e., Figure 3 The rotating member 121 is supported in a groove on its right end side, allowing it to rotate about axis L2. In other words, Figure 3 The protrusion at the left end of the rotating member 121 forms the rotation axis of the rotating member 121. In addition, the cover 111 includes a first side and a second side, and the first side and the second side are respectively provided with support holes for supporting the rocking shaft 1131. Furthermore, the protrusion on the first side of the cover 111 is spaced apart from the support holes.

[0056] like Figure 3As shown, a vertically extending arm 1212 is provided on the other end side (i.e., the right end side) of the rotating member 121. It should be noted that "vertically extending" here means that the arm is perpendicular to the plane in which the rotating member rotates. The end of the arm 1212 is provided as a first contact portion, and a second contact portion for contacting the first contact portion is provided on the housing 113. The rotation transmission member 122 includes the first and second contact portions respectively provided on the rotating member 121 and the housing 113.

[0057] In one example, such as Figure 5A As shown, a support leg 1132 is provided on the side of the housing 113 opposite to the supporting surface. A second contact portion is provided on the support leg 1132; more specifically, this second contact portion is the flat inner surface of the support leg 1132. And, as... Figure 3 and 4 As shown, when installed on the left and right seats of the vehicle respectively, the contact points are located at... Figure 5A At the positions shown in portions 1132A and 1132B, respectively, the spherical first contact portion (capable of...) Figure 4 (As observed) will make contact (more specifically, point contact) with the flat inner surface of the leg 1132 at portions 1132A and 1132B, respectively. And as an example, such as Figure 5A As shown, the housing 113 has a through hole in the portion between the two legs 1132, which facilitates the discharge of debris. However, this is merely an example; the form of the first and second contact portions is not limited to this and can be configured to... Figure 5A The forms shown are different. For example, as... Figure 5B As shown, the first contact portion can be in the form of a cylinder, and the second contact portion can be disposed on the support leg 1132' having an arc-shaped inner surface. More specifically, the second contact portion is the arc-shaped inner surface of the support leg 1132', and the cylindrical first contact portion will contact the arc-shaped inner surface of the support leg 1132' (more specifically, point contact).

[0058] In this configuration, the rotation transmission mechanism 122 transmits the rotation of the rotating member 121 to the housing 113 through the contact between the first contact portion on the arm 1212 and the second contact portion on the housing 113, even if the rotation axis L2 of the rotating member 121 and the rocking axis L1 of the housing 113 are at any angular relationship. This causes the housing 113 to rock. Consequently, the rotation transmission mechanism 122 ensures that the reference line of the acceleration sensor 30 points vertically in the vehicle's longitudinal direction, thus keeping the inertial sphere support surface, which serves as the sensor's reference plane perpendicular to the sensor reference line, slightly horizontal.

[0059] The seat belt retractor 11 of the above structure is installed in a standard posture according to the type of the vehicle and the style of the seat, as in a state in which the vehicle is inclined rearward by 15° and in a state in which the vehicle is inclined in the vehicle width direction (left-right direction) by a = 15°, and is installed on the seat back 21. The reason why the seat belt retractor 11 is installed in the vehicle width direction at different inclination directions and angles according to the type of the vehicle and the style of the seat is to make the inclination of the winding shaft in the vehicle width direction coincide with the extraction direction of the seat belt 30, so that the seat belt 30 can be smoothly extracted.

[0060] Therefore, the rotating member 121 inclined at a certain angle with respect to the horizontal direction and the rotation axis L2 thereof are not on the same straight line as the rocking axis Ll of the case 113 maintained in the horizontal direction, but a certain angle a is set between the two axes.

[0061] It is understood that it is necessary to ensure that the inclination angle of the seat back 21 and the rotation angle of the case 113 (the inclination movement direction of the seat back and the reverse rotation angle of the case) are accurately synchronized. If the rotation angle of the seat back 21 and the rotation angle of the case 113 are not accurately synchronized, the support surface of the inertia ball will not be accurately maintained horizontal, so that the acceleration sensor 110 will not be able to respond correctly. For example, assuming that the rotation track surfaces of both the rotating member 121 and the case 113 are parallel to each other, and the axes (the rotation axis L2 and the rocking axis Ll) thereof are on the same straight line, when the rotating member 121 and the case 113 are rotated, the contact point position between the first contact portion and the second contact portion is constant and does not change, so the track of this contact point is a perfect circle. However, in the case where the rotation track surfaces of both the rotating member 121 and the case are not parallel to each other, the position of the contact point can change in the radial direction according to the rotation angle, so the rotation track of the contact point can become non-circular (elliptical).

[0062] In order to ensure that the rotation angle of the seat back 21 and the rotation angle of the case 113 are synchronized, the seat belt retractor of the present application is provided as follows: the center A of the inertia ball 112 is provided on the axis L2 of the rotation shaft of the rotating member 121, and the straight line determined by the center A of the inertia ball 113 and the transmission contact point C defined by the first contact portion and the second contact portion is perpendicular to the axis L2 of the rotation shaft of the rotating member 113. Figure 3 and Figure 4 The seat belt device according to the embodiment of the present application installed on the left seat and the right seat, respectively, when viewed from the front of the vehicle, respectively, are shown, both of which clearly show the above-described arrangement of the present application. The principle of the present application will be described in further detail below.

[0063] Figure 6 The movement tracks of some points in the seat belt device according to the embodiment of the present application are schematically shown. The following will be described with reference to Figure 6The seat belt device according to the present application will be further described.

[0064] As shown in Figure 6 Fig. 4, the movement trajectories of four points are shown, in addition to the already mentioned transfer contact point C defined by the ball center A of the inertia ball 113, the first contact and the second contact of the shell 111 and the rotating member 121, the B point and the D point are selected for the convenience of description, wherein the B point is the contact point between the shell 111 and the rotating member 121 and is located on the axis of the rotation axis of the rotating member 121, and the D point is a point satisfying the rectangle formed by the points A, B and C, that is, the D point is a point on the plane where the rotating action of the rotating member 121 is located. It should be noted that the D point can be a point on the rotating member 121, for example, the end point of the arm portion 1212, or a virtual point.

[0065] When the rotating member 121 rotates, the point C and the point D rotate around the rotation axis L2 (i.e., the straight line AB) of the rotating member 121 by a certain angle (for example, 90 degrees as shown in Fig. 4). Figure 6 In view of the fixed positional relationship between the four points A, B, C and D, in other words, in view of the fact that the straight line AB is collinear with the axis L2, and the straight line AC is perpendicular to the straight line AB, the angle through which the straight line BD rotates is the angle through which the rotating member 121 rotates, and similarly, the angle through which the straight line AC rotates is the angle through which the shell 113 rotates.

[0066] After the inventors of the present application studied and analyzed, it is believed that the asynchronization between the rotation angle of the chair back and the rotation angle of the shell is mainly caused by two factors, one factor is that there is a certain angle between the rotation axis of the rotating member and the rocking axis of the shell, and the other factor is the setting position of the transfer contact point and the ball center of the inertia ball. Since the first factor inevitably exists and cannot be changed, the present application focuses on the second factor, and studies how the second factor affects the asynchronization between the rotation angle of the chair back and the rotation angle of the shell. The conclusions of the study are introduced below.

[0067] In order to better understand the present application, the design of the present application will be compared with the design not using the present application. Specifically, as a comparison, the A' point is also shown in Figure 6 Unlike the seat belt retractor in the present application, the A' point is not arranged on the rotation axis L2 of the rotating member, therefore, the angle through which the straight line A' C rotates is the angle through which the shell rotates. It can be obviously observed that the angle through which the straight line A' C rotates is different from the angle through which the straight line BD rotates, which means that the angle through which the rotating member rotates is different from the angle through which the shell rotates, therefore, the rotation angle of the chair back and the rotation angle of the shell cannot be synchronized.

[0068] Therefore, in the safety belt device of the present application, by setting the safety belt retractor as follows: the ball center of the inertia ball is set on the axis of the rotation shaft of the rotating member, and the straight line determined by the ball center of the inertia ball and the transmission contact point defined by the first contact portion and the second contact portion is perpendicular to the axis of the rotation shaft of the rotating member, the rotation angle of the seat back and the rotation angle of the housing can be synchronized, and a compensation mechanism is not needed for the asynchronization between the rotation angle of the seat back and the rotation angle of the housing. Moreover, by the structural design and installation size of each part, the above-mentioned ball center and transmission contact point of the safety belt retractor of the present application can be ensured to be located at the predetermined position, and positioning parts are not needed. Therefore, the safety belt device of the present application has fewer parts.

[0069] In addition, compared with the compensation mechanism in the prior art, which is set as a winding groove with a radius change on the pulley, in the safety belt device of the present application, a winding groove for the rope belt is set on the pulley, and the winding groove includes a circular arc-shaped section with the center of the pulley as the center. Therefore, the pulley does not need to be designed differently for the left seat and the right seat. The pulley of the safety belt device of the present application can be designed the same for the left seat and the right seat. Similarly, the retractor frame, the housing, and the second sensor lever of the safety belt device of the present application can all be designed the same for the left seat and the right seat. Therefore, the safety belt device of the present application has good versatility.

[0070] As described above, although the exemplary embodiments of the present application have been described with reference to the accompanying drawings in the description, the present application is not limited to the above-described specific embodiments, and the scope of protection of the present application should be defined by the claims and their equivalent meanings.

Claims

1. A seatbelt device (10), comprising: A seatbelt retractor (11) is mounted on the backrest (21) of the seat (20) and tilted at an angle to the left or right relative to the up-down direction of the backrest (21); and The cable advance / retreat mechanism (12) has a cable (1210) that can advance or retreat a corresponding distance according to the angle of rotation of the backrest (21) relative to the seat cushion (22) of the seat (20); The seatbelt retractor (11) includes: An acceleration sensor (110) is used to detect the vehicle's acceleration in the longitudinal direction, and the seatbelt retractor (11) locks the seatbelt (30) in place based on the detected acceleration; and An attitude control mechanism (120) is used to keep the reference plane of the accelerometer (110) horizontal; The acceleration sensor (110) includes a cover (111), an inertial ball (112), and a housing (113). The inertial ball (112) is held on a support surface of the housing (113). The housing (113) includes a rocking shaft (1131) extending along the left-right direction of the vehicle and is held in the cover (111) via the rocking shaft (1131) in a rotatable manner in the front-rear direction. The attitude control mechanism (120) includes a rotating member (121) and a rotation transmission member (122), the rotating member (121) rotating based on the corresponding distance the rope (1210) moves forward or backward, and the rotation transmission member (122) transmitting the rotation of the rotating member (121) to the acceleration sensor (110) so that the acceleration sensor (110) rocks in the front-back direction via the rocking shaft (1131); Its features are, The rotating member (121) includes a rotation axis (1211), and the center (A) of the inertial sphere (112) is disposed on the axis (L2) of the rotation axis (1211); and, The rotational transmission member (122) includes a first contact portion and a second contact portion respectively disposed on the rotational member (121) and the housing (113), the first contact portion and the second contact portion defining a transmission contact point (C), and the straight line determined by the transmission contact point (C) and the center of the ball (A) is perpendicular to the axis (L2) of the rotational shaft (1211).

2. The seat belt device (10) according to claim 1, wherein, The cover (111) includes a first side and a second side opposite to each other. The first side and the second side are respectively provided with support holes for supporting the rocking shaft (1131). The first side is also provided with a protrusion. The protrusion is configured to extend into a groove on the rotating member (121) to support the rotating member (121). The contact point defined by the protrusion and the groove is located on the axis (L2) of the rotating shaft (1211) of the rotating member (121).

3. The seat belt device (10) according to claim 2, wherein, The rotating shaft (1211) is disposed on one end of the rotating member (121), and a vertically extending arm (1212) is disposed on the other end of the rotating member (121). The end of the arm (1212) is configured as a first contact portion, and a second contact portion for contacting the first contact portion is disposed on the housing (113).

4. The seat belt device (10) according to claim 3, wherein, The attitude control mechanism (120) includes a pulley (124) for transmission connection with the rotating member (121), and the pulley (124) is provided with a winding groove for the rope (1210), the winding groove including an arc-shaped section centered on the center of the pulley (124).

5. The seat belt device (10) according to claim 4, wherein, The housing (113) is provided with a support leg (1132, 1132') on the side opposite to the support surface, and the second contact portion is provided on the support leg (1132, 1132').

6. The seat belt device (10) according to claim 5, wherein, The housing (113) has a through hole in the portion between the two legs (1132, 1132').

7. The seat belt device (10) according to claim 6, wherein, The acceleration sensor (110) also includes an action component, which is linked to the movement of the inertial ball (112) in the front-back direction, so that the pulling action of the seat belt (30) is locked by the locking mechanism.

8. The seat belt device (10) according to claim 7, wherein, The actuating component includes a first sensor lever (1141), which is rotatably held on the housing (113) in the front-rear direction and is linked to the housing (113) via the inertial ball (112).

9. The seat belt device (10) according to claim 8, wherein, The actuating component also includes a second sensor lever (1142), which includes a lower abutting portion that abuts against the first sensor lever (1141) and an upper abutting portion that abuts against the locking mechanism.

10. The seatbelt device (10) according to claim 9, wherein, The locking mechanism includes a ratchet, and the first sensor lever (1141) is provided with a rib for abutting against the lower abutment, the upper abutment and the lower abutment of the second sensor lever (1142) are configured as grippers, and the pawl of the ratchet is used to abut against the upper abutment.

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