JP6774546B2 - Seat belt device and its assembly method - Google Patents

Description

The present invention relates to a seatbelt device for protecting an occupant in a vehicle and an assembling method thereof, and more particularly to a seatbelt device in which a seatbelt retractor is incorporated into a seat back of a reclining seat and an assembling method thereof.

The seatbelt device mounted on the vehicle is for restraining the occupant seated on the seat by the seatbelt pulled out from the seatbelt retractor and protecting the occupant in the event of a vehicle collision or the like. When an acceleration larger than a predetermined value acts in the horizontal direction in the event of a vehicle collision, the seatbelt retractor detects this acceleration with an acceleration sensor and activates the seatbelt locking mechanism, which makes it impossible to pull out the seatbelt. To. As the inertial body used for the acceleration sensor, one using a ball and one using a self-supporting inertial body are known.

By the way, when the seat back of a reclining seat is equipped with a seat belt retractor equipped with this type of acceleration sensor, the posture of the seat belt retractor changes depending on the reclining angle (tilt angle) of the seat back. Then, the acceleration cannot be detected properly. Therefore, there is known a seatbelt device equipped with an acceleration sensor capable of appropriately detecting acceleration regardless of the reclining angle of the seatback (see, for example, Patent Documents 1 and 2).

The seatbelt device described in Patent Document 1 includes a lever member attached to the seat cushion, a casing member attached to the seatback, and a cam member to which a cable extending from the acceleration sensor side is connected. A mechanism linked to tilting is provided. When assembling such a mechanism to the reclining seat, the temporary fixing pin is passed through the positioning holes formed in each of the lever member, the cam member, and the casing member so that the lever member, the cam member, and the casing member do not move relative to each other. The lever member is fixed to the seat cushion, and the casing member is fixed to the seat back in the state of being temporarily fixed to. After that, the sensor housing of the acceleration sensor is adjusted to an appropriate orientation by adjusting the pull-out length of the cable.

Japanese Patent Application Laid-Open No. 2013-123994 Japanese Patent Application Laid-Open No. 2013-133022

By the way, in the conventional seatbelt device, as shown in FIG. 15, the temporary fixing pin 300 penetrating the positioning holes 211, 212, 213 of the lever member 201, the cam member 202, and the casing member 203 may be tilted. In this case, the lever member 201 may also be tilted with respect to the casing member 203. As a result, the lever member 201 and the casing member 203 are fixed to the seat cushion and the seat back in a relatively displaced state, and the angle accuracy of the acceleration sensor connected by the cable from the horizontal direction is lowered. , The detection accuracy of the acceleration sensor may decrease. Therefore, it is necessary to fix the lever member 201 and the casing member 203 to the seat cushion and the seat back, respectively, while taking care not to tilt the temporary fixing pin 300, and it is required to improve the assembling workability.
In addition, a mechanism that includes a lever member, a cam member, and a casing member and that is interlocked with the tilt of the seat back needs to be individually configured for the left and right seats.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to prevent the assembling jig pin from tilting with respect to the casing member and to improve the positional accuracy between the casing member and the lever member. An object of the present invention is to provide a seatbelt device capable of improving the detection accuracy of an acceleration sensor and a method for assembling the seatbelt device.

The above object of the present invention is achieved by the following configuration.
(1) A spindle that winds up the seatbelt, an acceleration sensor that detects acceleration in the front-rear direction of the vehicle, a lock mechanism that locks the pull-out operation of the seatbelt according to the acceleration detected by the acceleration sensor, and the acceleration. A seatbelt retractor that has an attitude control mechanism that controls the attitude of the sensor and is attached to the seatback of the reclining seat provided in the vehicle.
It is arranged in a connecting portion that rotatably connects the seat back of the reclining type seat and the seat cushion, detects the tilt angle when the seat back tilts in the front-rear direction of the vehicle, and applies the tilt angle to the seat belt retractor. It has a cable for transmitting, and the tilting operation of the seat back is performed via the cable by moving the cable forward or backward in the length direction of the cable for a distance corresponding to the tilt angle of the seat back. A cable advancing / retreating mechanism that transmits to the attitude control mechanism of the seatbelt retractor,
With
The attitude control mechanism controls the posture of the acceleration sensor according to the advancing / retreating operation of the cable accompanying the tilting of the seat back, so that the acceleration sensor is kept constant within a predetermined range regardless of the tilt angle of the seat back. A seatbelt device that holds in the basic posture
The cable advancing / retreating mechanism is
A lever member that can be fixed to the seat cushion and
A casing member that can be fixed to the seat back and is rotatably arranged with respect to the lever member.
The lever member and the casing member are rotatable coaxially with the rotation center of the casing member, while the casing member is within a predetermined range of rotation with respect to the lever member. A cam member whose movement is blocked by the lever member and which is provided with a cable winding groove for winding the cable along the outer peripheral surface.
Have,
The lever member includes at least two ring plate portions each having an opening coaxial with the rotation center of the casing member.
The at least two ring plate portions are provided in a state of being separated from each other in the direction along the rotation center of the casing member, and are connected to the rotation center of the casing member on the outer side in the radial direction.
Insertion holes through which assembly jig pins are inserted are formed in each of the ring plate portions of the lever member and the casing member, respectively.
A seatbelt device, wherein each ring plate portion and each insertion hole of the casing member are coaxially arranged in a predetermined phase around a rotation center of the casing member.

(2) The casing member includes a pair of casing members provided on the outside of at least two ring plate portions in a direction along the rotation center of the casing member.
The pair of casing members are characterized in that the insertion holes are arranged coaxially with the insertion holes of the ring plate portions in the predetermined phase around the rotation center of the casing member. The seat belt device according to (1).

(3) The at least two ring plate portions are provided so as to sandwich the cam member in a state of being separated from each other in a direction along the rotation center of the casing member.
In the cam member, an insertion hole into which an assembly jig pin is inserted is coaxial with each ring plate portion and each insertion hole of the casing member in the predetermined phase around the rotation center of the casing member. The seatbelt device according to (1), characterized in that it is arranged above.

(4) The lever member is fixed to the seat cushion via a slide plate.
The lever member includes a plate guide portion for guiding the slide plate.
The method according to any one of (1) to (3), wherein the at least two ring plate portions are connected by the plate guide portion on the outer side in the radial direction with respect to the rotation center of the casing member. Seat belt device.

(5) The seatbelt device according to (4), wherein the slide plate is located between the two ring plate portions in a direction along the rotation center of the casing member.

(6) Each of the insertion holes of each of the ring plate portions is provided on the side opposite to the attachment portion to the seat cushion with respect to the rotation center of the casing member (1) to (5). ) The seat belt device according to any one of.

(7) A method of assembling the seatbelt device according to any one of (1) to (6), wherein the seatbelt device is attached to the reclining seat.
The lever member and the casing member are relatively rotated so that the ring plate portion and the insertion holes of the casing member are arranged coaxially.
The lever member is fixed to the seat cushion, and the casing member is fixed to the seat back, with the assembly jig pin inserted into the insertion holes of the casing member and the lever member. How to assemble the seatbelt device.

(8) A spindle that winds up the seatbelt, an acceleration sensor that detects acceleration in the front-rear direction of the vehicle, a lock mechanism that locks the pull-out operation of the seatbelt according to the acceleration detected by the acceleration sensor, and the acceleration. A seatbelt retractor that has an attitude control mechanism that controls the attitude of the sensor and is attached to the seatback of the reclining seat provided in the vehicle.
It is arranged at a connecting portion that rotatably connects the seat back of the reclining type seat and the seat cushion, detects the tilt angle when the seat back tilts in the front-rear direction of the vehicle, and sets the tilt angle to the seat belt retractor. It has a cable for transmitting, and the tilting operation of the seat back is performed via the cable by moving the cable forward or backward in the length direction of the cable for a distance corresponding to the tilt angle of the seat back. A cable advancing / retreating mechanism that transmits to the attitude control mechanism of the seatbelt retractor,
With
The attitude control mechanism controls the posture of the acceleration sensor according to the advancing / retreating operation of the cable accompanying the tilting of the seat back, so that the acceleration sensor is kept constant within a predetermined range regardless of the tilt angle of the seat back. A seatbelt device that holds in the basic posture
The cable advancing / retreating mechanism is
A lever member that can be fixed to the seat cushion and
A casing member that can be fixed to the seat back and is rotatably arranged with respect to the lever member.
The lever member and the casing member are rotatable coaxially with the rotation center of the casing member, while the casing member is within a predetermined range of rotation with respect to the lever member. A cam member whose movement is blocked by the lever member and which is provided with a cable winding groove for winding the cable along the outer peripheral surface.
Have,
The lever member is fixed to the seat cushion via a slide plate.
The lever member is connected to the plate guide portion that guides the slide plate and the plate guide portion on the outer side in the radial direction with respect to the rotation center of the casing member, and is an opening coaxial with the rotation center of the casing member. With a ring plate part with
The seatbelt device is characterized in that the slide plate is located in the middle of the plate guide portion in a direction along the rotation center of the casing member.
(9) The lever member includes at least two ring plate portions each having the opening coaxial with the rotation center of the casing member.
The at least two ring plate portions are provided so as to be separated from each other in the direction along the rotation center of the casing member, and the plate guide portion is radially outside the rotation center of the casing member. Connected with
The seatbelt device according to (8), wherein the slide plate is located between the two ring plate portions in a direction along the rotation center of the casing member.

According to the seatbelt device of the present invention, the casing member can be used as a seat back and the casing member can be used as a seat back while preventing the assembling jig pin from tilting with respect to the casing member and the lever member fitting to the assembling jig pin from tilting. The lever member can be accurately fixed to the seat cushion. Further, since the adjustment of the cable pull-out length is performed with reference to the casing member fixed to the reclining seat, it is possible to suppress the mounting angle error of the acceleration sensor and improve the detection accuracy.

Further, according to the seatbelt device of the present invention, the slide plate is located in the middle of the plate guide portion in the direction along the rotation center of the casing member, so that the lever member of the cable advancing / retreating mechanism, the casing member, and The cam member can be shared by the left and right seats.

(A) is a side view of the reclining seat provided with the seatbelt device of the present invention, (b) is a rear view of the left seat of the reclining seat, and (c) is the right side of the reclining seat. It is a rear view of a seat. (A) is a cross-sectional view of the seatbelt retractor for the right seat, which is attached to the left side at a predetermined angle θ, as viewed from the front side of the vehicle, and (b) is for the left seat, which is attached to the right side at an angle θ. It is sectional drawing of the seat belt retractor of the above as seen from the front side of the vehicle. It is an exploded perspective view of the seat belt retractor. It is an exploded perspective view of the acceleration sensor and the attitude control mechanism of the seat belt retractor. (A) is a perspective view showing an assembled state of the acceleration sensor and the attitude control mechanism, and (b) is a side view thereof. FIG. 5B is a cross-sectional view taken along the line VI-VI of FIG. 5B, showing a state when the seatbelt retractor is attached to the right side at an angle θ. (A) is a perspective view showing a configuration of a sensor housing used for a seatbelt retractor for a left seat, and (b) is a perspective view showing a configuration of a sensor housing used for a seatbelt retractor for a right seat. It is an exploded perspective view of the cable advance / retreat mechanism. (A) is a perspective view of the lever member viewed from the right side, and (b) is a perspective view of the lever member viewed from the left side. It is a front view of the cable advancing / retreating mechanism which removed one casing member. FIG. 10 is a cross-sectional view taken along the line XI-XI of FIG. It is a side view which shows the state of a seat belt retractor and a cable advancing / retreating mechanism when a seat back is tilted backward and is a standard state of 15 °. It is a side view which shows the state of the seat belt retractor and the cable advancing / retreating mechanism when the seat back is tilted backward and is 95 °. It is a side view which shows the state of the seat belt retractor and the cable advancing / retreating mechanism when the seat back is moved forward by 75 °. It is sectional drawing of the main part of the conventional cable advance / retreat mechanism.

Hereinafter, embodiments of the seatbell device according to the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 (a) to 1 (c), the seat belt device 10 of the present embodiment is attached to the seat back 16 of the reclining seat 15 and has a seat belt retractor 11 capable of winding the seat belt 19 and a seat belt retractor 11. A cable (also called an inner cable) 13a is moved back and forth by a length corresponding to the tilt angle of the seat back 16 which is arranged in a connecting portion 18 which rotatably connects the seat back 16 and the seat cushion 17 of the reclining seat 15. It is equipped with a cable advancing / retreating mechanism 100 that transmits the tilting motion of the seat back 16 to the seatbelt retractor 11 via the cable 13a, and has a function of restraining an occupant in the vehicle with respect to the reclining seat 15 in the event of a vehicle collision. Have.
The cable advancing / retreating mechanism 100 of FIG. 1A is shown with the casing member 120 described later removed.

The cable (inner cable) 13a constitutes the cable unit 13 by being covered with an outer tube 13b (see FIG. 3) described later, and the terminal members 13d at both ends of the outer tube 13b form a seatbelt retractor 11 and the cable advances and retreats. It is fixed to a pair of casing members 120 and 130 described later in the mechanism 100. As a result, the cable 13a housed inside the outer tube 13b is configured to smoothly slide in the extending direction without slack with respect to the outer tube 13b and move forward and backward.

The seatbelt retractor 11 tilts at an arbitrary angle in the front-rear direction of the vehicle according to the reclining angle of the seatback 16. Further, in the width direction of the vehicle (left-right direction of the vehicle), the seatbelt 19 can be smoothly extended from the seatbelt retractor 11, so that the seatbelt 19 is attached at a predetermined angle θ that differs depending on the vehicle type and the seat specifications. Here, the reference mounting posture of the seatbelt retractor 11 is tilted approximately 15 ° to the rear of the vehicle (backward tilting 15 °) and tilted by a predetermined angle θ (= 15 °) in the width direction of the vehicle. , Attached to the seat back 16. That is, as shown in FIG. 1 (b), in the case of the left seat, it is attached to the left side when viewed from the rear side by a predetermined angle θ (= 15 °), and as shown in FIG. 1 (c). In addition, in the case of the right seat, it is installed at an angle of θ (= 15 °) to the right side when viewed from the rear side.

As shown in FIGS. 2 and 3, the seatbelt retractor 11 includes a retractor frame 21 fixed to the seatback 16, and the retractor frame 21 has a rotatable spindle 22 around which the seatbelt 19 is wound. It is supported.

A retractor spring 23 that rotationally urges the spindle 22 in the winding direction of the seat belt 19 is connected to one end side of the spindle 22 in the axial direction, and the retractor spring 23 is housed in the cover 23a.

On the other end side of the spindle 22 in the axial direction, the steering wheel 25, which is a component of the lock mechanism 24 that locks the pull-out operation of the seat belt 19, and the acceleration in the front-rear direction acting on the vehicle are detected and detected. The attitude control mechanism 70 keeps the sensor reference plane (inertial body support surface 33, which will be described later) of the acceleration sensor 30 substantially horizontal regardless of the tilt angle of the seat back 16 and the acceleration sensor 30 that operates the lock mechanism 24 in response to the acceleration. And are provided.

The steering wheel 25 is coupled to the spindle 22 so as to rotate integrally, and is arranged on the outer peripheral surface at predetermined intervals in the circumferential direction in which it engages with the upper claw portion 36b of the operating member (first sensor lever 36) described later. However, it has a plurality of engaging claws 25a and is housed inside the steering wheel cover 27. Further, the entire side surface of the seatbelt retractor 11 including the acceleration sensor 30 on the other end side is covered with the retractor cover 29.

As shown in FIGS. 3 and 4, the acceleration sensor 30 has a sensor cover 31 fixed to the outer surface of the retractor frame 21 so as to tilt in the vehicle front-rear direction integrally with the seat back 16, and the acceleration sensor 30 is aligned with the vehicle left-right direction. It is oscillatingly supported in the vehicle front-rear direction with respect to the sensor cover 31 about the swing axis L1 (see FIG. 6), and when the seat back 16 is tilted, the posture control mechanism 70 makes the sensor cover 31 in the vehicle front-rear direction. By being rotated, the sensor housing 32 that holds the inertial body support surface 33 as the sensor reference surface in a substantially horizontal state in the front-rear direction of the vehicle and the sensor housing 32 that is supported on the inertial body support surface 33 of the sensor housing 32 and have a predetermined value. The iron ball 35 as an inertial body that displaces from the neutral position when the above acceleration in the vehicle front-rear direction acts, and the operation of operating the lock mechanism 24 toward the lock side in conjunction with the ball 35 when it is displaced in the vehicle front-rear direction. It has a second sensor lever 37, which is a member.

Specifically, as shown in FIG. 6, a pair of boss portions 32a and 32b projecting from the outer surface of the sensor housing 32 are fitted into the pair of support holes 31a and 31b of the sensor cover 31, respectively. The swing shaft L1 is configured by the above, and the sensor housing 32 can swing around the swing shaft L1 in the vehicle front-rear direction. Further, as shown in FIG. 4, a pair of rotating protrusions 37a and 37b of the second sensor lever 37 are fitted into the lever support holes 32e and 32f formed in the pair of brackets 32c and 32d of the sensor housing 32, and the second sensor housing 32 has a second. The 2 sensor lever 37 is rotatably supported in the vehicle front-rear direction with respect to the sensor housing 32.

The sensor housing 32 is provided with an inertial body support surface 33, which is a mortar-shaped concave surface recessed downward, on the upper inner bottom surface, and a ball 35 is placed on the inertial body support surface 33. When the ball 35, which is an inertial body, receives an acceleration in the vehicle front-rear direction equal to or higher than a predetermined value, the ball 35 is displaced from the neutral position and detects the acceleration acting on the vehicle (that is, the seatbelt retractor 11). The above-mentioned state in which the inertial body support surface 33 is substantially horizontal means that the reference surface of the inertial body support surface 33 (for example, the upper surface of the inertial body support surface 33) is substantially horizontal.

As shown in FIG. 3, the first sensor lever 36 has a boss portion 36a having a fitting hole at the base end portion, and an upper claw portion 36b and a second sensor whose tip portion abuts on the steering wheel 25. It is formed in a substantially Y shape provided with a lower claw portion 36c that abuts on the lever 37. The first sensor lever 36 is arranged below the steering wheel 25, and the fitting hole of the boss portion 36a is rotatably fitted to a support shaft (not shown) fixed to the retractor frame 21. .. Then, by rotating upward around the boss portion 36a having the fitting hole, the upper claw portion 36b engages with the engaging claw 25a of the steering wheel 25 to regulate the rotation of the steering wheel 25. Therefore, the steering wheel 25 and the first sensor lever 36 constitute the lock mechanism 24.

As shown in FIGS. 3 and 4, the second sensor lever 37 includes rotating protrusions 37a and 37b formed at the base end portion, a bowl portion 37c formed on the tip end side and covering the upper surface of the ball 35, and a bowl. A rib 37d formed on the upper surface of the portion 37c is provided. The rotary protrusions 37a and 37b are rotatably fitted in the lever support holes 32e and 32f of the sensor housing 32. In the second sensor lever 37, the bowl portion 37c is in contact with the upper side of the ball 35, and the lower claw portion 36c of the first sensor lever 36 is in contact with the upper surface of the rib 37d. Then, when the ball 35 is displaced from the neutral position due to acceleration, it rotates upward and pushes up the first sensor lever 36 upward via the lower claw portion 36c, and the upper claw portion 36b is attached to the engaging claw 25a of the steering wheel 25. Engage to lock the steering wheel 25. The positions of the rotation axes of the first sensor lever 36 and the second sensor lever 37 are set in opposite directions when viewed from the center of the ball 35 so as to rotate in opposite directions when the ball 35 is displaced. Has been done.

Further, as shown in FIG. 4, the attitude control mechanism 70 for controlling the posture of the sensor housing 32 in the front-rear direction includes the first pulley case 71 and the second pulley case 72 arranged inside the side plate of the retractor frame 21. A pulley 73 housed in an internal space formed by combining the first pulley case 71 and the second pulley case 72, an adjusting gear 74, a torsion spring 75 for rotationally urging the pulley 73, and an adjusting gear 74. It is composed of a rotation transmission mechanism 76 that transmits the rotation of the acceleration sensor 30 to the sensor housing 32 of the acceleration sensor 30.

The pulley 73 is rotatably supported by the first pulley case 71 and the second pulley case 72 around the support shaft 71c provided in the first pulley case 71, and is a cable (inner cable) by the cable advancing / retreating mechanism 100. The forward / backward movement of 13a is converted into a rotational movement, and the cable unit 13 rotates in the same direction as the tilting direction of the seat back 16 by an angle corresponding to the forward / backward movement of the cable unit 13. The pulley 73 is provided with a cable winding groove 73b on the outer peripheral surface for winding the cable 13a, and one end (upper end) of the cable 13a is fixed to the pulley 73 via an end block 13c. The cable 13a is slidably passed through the outer tube 13b, and the terminal member 13d attached to one end of the outer tube 13b is fixed to the first pulley case 71 and the second pulley case 72.

The torsion spring 75 (see FIG. 3) rotationally urges the pulley 73 in the winding direction of the cable 13a. Further, the adjust gear 74 is a rotating member that meshes with the gear 73a formed on the side portion of the pulley 73 and rotates synchronously in the direction opposite to the tilting direction of the seat back 16 at the same rotation angle, as shown in FIG. One shaft protrusion 74a is fitted into the support hole 71a formed in the first pulley case 71, and the other shaft protrusion 74b having a spherical tip is passed through the opening window 71b (see FIG. 4) of the first pulley case 71. The adjust gear 74 is supported so that it can rotate about the rotation shaft L2 by fitting it into the spherical hole 32g on the end surface of the boss portion 32b of the sensor housing 32. In this case, by fitting the spherical hole 32g and the spherical shaft protrusion 74b, the rotation shaft L2 of the adjust gear 74 and the swing shaft L1 of the sensor housing 32 have the shaft protrusion 74b even if both axes have an arbitrary angular relationship. It intersects at one point at the center of. That is, the rotation shaft L2 and the swing shaft L1 of the sensor housing 32 intersect at one point regardless of whether they are on the same straight line or have an inclination relationship, and the rotation shaft with respect to the swing shaft L1. L2 is configured to have an arbitrary inclination.

The rotation transmission mechanism 76 transmits the rotation of the adjust gear 74 to the sensor housing 32 regardless of whether the rotation shaft L2 of the adjust gear 74 and the swing shaft L1 of the sensor housing 32 are on the same straight line or have an inclination. Therefore, the sensor housing 32 is configured to be able to swing. As a result, the rotation transmission mechanism 76 directs the sensor reference line S1 of the acceleration sensor 30 (a line perpendicular to the sensor reference plane passing through the center point of the ball 35 in the neutral position) in the vertical direction in the vehicle front-rear direction. , The inertial body support surface 33 as the sensor reference surface perpendicular to the sensor reference line S1 is held substantially horizontally. Therefore, the rotation transmission mechanism 76 in this embodiment is a pin formed on the adjusting gear 74 and the sensor housing 32, which are arranged at positions radially separated from the swing shaft L1 and the rotation shaft L2 and engage with each other. It is composed of a combination of 74c and a slit 32h.

Here, the pin 74c is formed on the adjustment gear 74 side and the slit 32h is formed on the sensor housing 32 side, but it may be formed in reverse. The slit 32h is formed in the arm 32i projecting below the side portion of the sensor housing 32. The arm 32i needs to be able to securely engage the slit 32h and the pin 74c and not interfere with other parts. Therefore, the sensor housing 32L (32) used for the seatbelt retractor for the left seat as shown in FIG. 7A and the sensor housing used for the seatbelt retractor for the right seat as shown in FIG. 7B. The shape of the arm 32i is slightly different from that of the 32R (32).

The seatbelt retractor 11 having the above configuration has a different reference mounting posture depending on the vehicle type and seat specifications, for example, in a state where the seatbelt retractor 11 is tilted approximately 15 ° rearward of the vehicle and θ = 15 ° in the width direction (horizontal direction) of the vehicle. It is attached to the seat back 16. The seatbelt retractor 11 can be mounted at different inclination directions and angles in the vehicle width direction depending on the vehicle type and seat specifications by matching the inclination of the spindle 22 in the vehicle width direction with the withdrawal direction of the seatbelt 19 so that the seatbelt retractor 11 can be smoothly pulled out. This is to enable.

Therefore, as shown in FIG. 6, by tilting the retractor frame 21 to the right side by a predetermined angle θ (= 15 °), the pulley 73 of the attitude control mechanism 70 and the rotating raceway surface of the adjust gear 74 face the vertical plane. On the other hand, when the retractor frame 21 is tilted to the right by a predetermined angle θ and vice versa, although not shown, the retractor frame 21 is tilted to the left by a predetermined angle θ to rotate the pulley 73 and the adjust gear 74 of the attitude control mechanism 70. There are two mounting postures, one is when the moving track surface is tilted to the left by a predetermined angle θ with respect to the vertical plane.

From such a mounting posture, in the present embodiment, it is assumed that the rotation shaft L2 of the adjust gear 74 is tilted by a predetermined angle θ with respect to the horizontal direction along the left-right direction of the vehicle, and the adjustment is performed in this way. Even when the rotation shaft L2 of the gear 74 is tilted with respect to the horizontal, the swing shaft L1 of the sensor housing 32 of the acceleration sensor 30 is kept substantially horizontal and the sensor reference line S1 of the acceleration sensor 30 points in the vertical direction. As such, sensor covers 31 are prepared for each type for the left and right seats. Therefore, the rotation shaft L2 of the adjusting gear 74 inclined with respect to the horizontal and the swing shaft L1 of the sensor housing 32 kept substantially horizontal are set to intersect with each other with a predetermined angle θ, and then The rotation transmission mechanism 76 is configured by the combination of the pin 74c and the slit 32h described above.

The mounting angle of the retractor frame 21 can be arbitrarily set including the case where θ = 0 °, and the acceleration sensor 30 is retracted using the dedicated sensor cover 31 prepared for each set mounting angle. When attached to the frame 21, the swing shaft L1 of the sensor housing 32 can always be kept substantially horizontal. At that time, even if the swing shaft L1 of the sensor housing 32 and the rotation shaft L2 of the adjust gear 74 are on the same straight line, they intersect with an inclination (that is, the rotating raceway surface of the adjust gear 74 and the sensor housing 32). The rotation of the adjust gear 74 can be transmitted to the sensor housing 32 without difficulty by the combination of the pin 74c and the slit 32h even when the rotation raceway surfaces of the gears are parallel to each other and non-parallel to each other).

Next, the cable advancing / retreating mechanism 100 will be described in detail.
As shown in FIG. 8, the cable advancing / retreating mechanism 100 includes a lever member 110, a slide plate 118, a pair of left and right casing members 120 and 130, a cam member 140, a cable adjuster 150, and a cable fixing plate 180. have.

With reference to FIG. 9, the lever member 110 includes two ring plate portions 112a and 112b that are axially separated from each other, and a plate guide portion 113 that connects the two ring plate portions 112a and 112b. The ring plate portion 112a is formed with a first opening 114a, which is a circular hole, at the center thereof. The ring plate portion 112b is formed with a second opening 114b in which a part of the circular hole is cut out toward the plate guide portion 113. The arc portion of the first opening 114a and the second opening 114b is formed coaxially, and the axial direction of the arc portion of the first opening 114a and the second opening is a cable advancing / retreating mechanism. When 100 is fixed to the seat back 16, it coincides with the rotation center of the seat back 16 (the rotation center of the casing members 120 and 130).

Specifically, in the present embodiment, the first opening 114a is rotatably fitted to the boss portion 133 of the casing member 130 described later, whereby the casing members 120 and 130 and the lever member 110 are brought together. It becomes relatively rotatable.
In the present embodiment, the arc portion of the second opening 114b has a diameter larger than that of the first opening 114a. That is, the first opening 114a and the second opening 114b may be supported by the boss portion 133 of the casing member 130 with at least one of them as a circular hole.

Further, on the outer periphery of the ring plate portion 112b, an abutting portion 115 that comes into contact with a convex portion 143c provided on the side surface of the cam portion 143 of the fan-shaped cam member 140, which will be described later, to prevent the cam member 140 from rotating. It is provided.

Insertion holes in the two ring plate portions 112a and 112b through which the assembly jig pin 170 described later is inserted on the side opposite to the plate guide portion 113 in the radial direction with respect to the rotation center of the casing members 120 and 130. 116a and 116b are formed so as to penetrate coaxially. The insertion hole 116a of the ring plate portion 112a is a circular hole, and the insertion hole 116b of the ring plate portion 112b is formed in a substantially U shape with a notch at the bottom. The shapes of the insertion holes 116a and 116b are not particularly limited as long as they can be positioned by the assembly jig pin 170.

The plate guide portion 113 connects two ring plate portions 112a and 112b on the outer side in the radial direction of the openings 114a and 114b. The plate guide portion 113 is a guide that penetrates the middle of the two ring plate portions 112a and 112b (at the center position in the axial direction) along the radial direction of the ring plate portions 112a and 112b in the axial direction of the openings 114a and 114b. It has a groove 117. The guide groove 117 accommodates the slide plate 118 and guides the slide plate 118 so as to be slidable in the radial direction. The side walls 113a and 113b of the plate guide portion 113 forming the guide groove 117 are provided with elongated holes 113c extending in the radial direction of the ring plate portions 112a and 112b, respectively.

The slide plate 118 is provided with an elongated hole 119 for fixing the lever member 110 to the seat cushion 17 with a nut, and a protruding portion 118a that fits into the elongated hole 113c of the plate guide portion 113.
Therefore, the lever member 110 is fixed to the seat cushion 17 via the slide plate 118.

The casing members 120, 130 include an annular outer peripheral wall 121, 131 that covers the periphery of the cam member 140, a substantially disk-shaped flat surface portion 122, 132 provided inside the outer peripheral wall 121, 131, and a flat surface portion 122, It has cylindrical boss portions 123 and 133 provided inside 132, and cable introduction portions 126 and 136 protruding to the outside are provided on a part of outer peripheral walls 121 and 131. The casing members 120 and 130 are formed in a mirror-symmetrical shape except for a part such as the boss portions 123 and 133, that is, at least the outer peripheral walls 121 and 131, the flat surface portions 122 and 132, and the cable introduction portions 126 and 136. Is formed in a mirror-symmetrical shape. The casing members 120 and 130 are integrally assembled by fitting the boss portion 133 of the casing member 130 to the boss portion 123 of the casing member 120. The two ring plate portions 112a and 112b of the lever member 110 and the cam member 140 are rotatably accommodated in the internal space formed by connecting the casing members 120 and 130.

With reference to FIG. 10, the cable introduction portions 126 and 136 are provided with cable guide grooves 127a, 127b, 137a and 137b extending in the tangential direction of the outer peripheral walls 121 and 131. The outer cable guide grooves 127a and 137a are formed in a size (groove width large) into which the terminal of the outer tube 13b of the cable unit 13 and the terminal member 13d attached to the terminal can be inserted, and the inner cable guide groove 127b, The 137b is formed in a size (small groove width) into which only the cable 13a pulled out from the terminal of the outer tube 13b can be inserted. Further, the outer cable guide grooves 127a and 137a are provided with outer tube terminal fixing portions 128 and 138 for positioning and fixing the terminal member 13d of the outer tube 13b.
The outer tube 13b of the cable unit 13 is also held by the cable fixing plate 180 fixed to the seat back 16.

Further, on the inner circumference of the outer peripheral walls 121 and 131 of the casing members 120 and 130, one end 143a of the cam portion 143 of the cam member 140 described later when the casing members 120 and 130 rotate in the direction of arrow Y2 in FIG. The abutting step portions 129 and 139 are provided to rotate the cam member 140 in the same direction by abutting the cam member 140.

In the casing members 120 and 130, the boss portion 133 of the casing member 130 is fitted and combined with the boss portion 123 of the casing member 120, and the boss portion 123 of the casing member 120 is rotated by the seat cushion 17 and the seat back 16. It is fixed to the seat back 16 in a state of being positioned on the connecting portion 18 (see FIG. 1) that is movably connected.

Further, the outer peripheral walls 121 and 131 of the casing members 120 and 130 are cut out from the outer peripheral walls 121 and 131 in a part in the circumferential direction in which the cable introduction portions 126 and 136 and the abutting step portions 129 and 139 are not provided. The cutout portions 121a and 131a are provided. The notch portions 121a and 131a cooperate with each other to form the slit 111 in a state where the casing members 120 and 130 are connected to each other (see FIG. 11). The slit 111 allows the casing members 120 and 130 to rotate the plate guide portion 113 of the lever member 110, and allows the adjusting screw 160 to be adjusted from the outside.

Further, insertion holes 125 and 135 are formed in the flat surfaces 122 and 132 of the casing members 120 and 130 at positions coaxial with each other when the casing members 120 and 130 are connected to each other. These insertion holes 125 and 135 have the radial positions of the casing members 120 and 130 from the rotation center at the same positions as the insertion holes 116a and 116b of the ring plate portions 112a and 112b. Therefore, in a predetermined phase of the lever member 110 and the casing members 120 and 130, the insertion holes 125 and 135 of the casing members 120 and 130 and the insertion holes 116a and 116b of the ring plate portions 112a and 112b are coaxially arranged, respectively. Be placed.

The cam member 140 is sandwiched between the two ring plate portions 112a and 112b of the lever member 110 and rotates coaxially with the rotation center of the casing members 120 and 130 with respect to the lever member 110 and the casing members 120 and 130. It can be installed freely.

The cam member 140 forms a circular hole 142 in the center of the ring portion 141, forms a fan-shaped cam portion 143 on a part of the outer peripheral portion of the ring portion 141 in the circumferential direction, and forms a fan-shaped cam portion 143 on the outer peripheral surface of the cam portion 143. A cable winding groove 144 is formed along an arc centered on the rotation center of the cam member 140. The cam member 140 is sandwiched between the two ring plate portions 112a and 112b, and the openings 114a and 114b are rotatably fitted to the boss portion 133 of the casing member 130 to fit into the internal space of the casing members 120 and 130. It is contained.

Further, as shown in FIG. 8, one end 143a of the cam portion 143 of the cam member 140 in the circumferential direction comes into contact with the abutting step portions 129 and 139 when the casing members 120 and 130 rotate in the arrow Y2 direction. As a result, the cam member 140 can be rotated around.

Further, the cam member 140 is provided with a convex portion 143c on the side surface, which abuts on the abutting portion 115 of the lever member 110 when the cam member 140 rotates in the direction of the arrow Y1 (see FIGS. 10 and 11). ). As a result, the movement of the cam member 140 is blocked by the lever member 110 while the casing members 120 and 130 are within a predetermined range of rotation with respect to the lever member 110 in the direction of the arrow Y1.

Further, an adjuster accommodating recess 149 is provided adjacent to the other end 143b of the fan-shaped cam portion 143 in a part of the ring portion 141 of the cam member 140 in the circumferential direction, and a cable is provided in the adjuster accommodating recess 149. The adjuster 150 is housed. In this cable adjuster 150, the terminal portion on the base end (lower end) side of the cable 13a whose tip (upper end) is wound around the pulley 73 (see FIGS. 4 and 6) of the attitude control mechanism 70 is fixed to the cam member 140. At the same time, the length of the cable 13a is adjusted by pulling the cable 13a so that there is no slack.

The cable adjuster 150 includes a small piece having a substantially rectangular parallelepiped shape as an adjuster main body 151. The adjuster body 151 is attached to the cam member 140 so that it can slide linearly in the tangential direction of a circle centered on the rotation center of the cam member 140 (rotation center of the casing members 120 and 130). Therefore, in the adjuster main body 151, in order to guide the sliding operation, the guide rail 152 provided on the inner side surface of the adjuster main body 151 is formed with a guide rail (not shown) formed at the bottom of the adjuster accommodating recess 149. It is slidably fitted.

Further, the terminal portion of the cable 13a wound in the cable winding groove 144 is fixed to one end side of the adjuster main body 151 (the side closer to the other end 143b of the cam portion 143). The cable winding groove 144 of the cam portion 143 of the cam member 140 is wound around the terminal portion of the cable 13a pulled out from the terminal portion of the outer tube 13b at a maximum of about 1/4 turn.

An adjusting screw 160 for adjusting the position of the adjuster main body 151 with respect to the cam member 140 is screwed to the other end of the adjuster main body 151 in the sliding direction (the side far from the other end 143b of the cam portion 143).

Further, in the cam member 140, the radial positions of the casing members 120 and 130 from the rotation center are at the same positions as the insertion holes 116a, 116b and 125, 135 of the ring plate portions 112a and 112b and the casing members 120 and 130. , The insertion hole 145 is formed.
As a result, the insertion holes 116a, 116b, 145, 125, 135 provided in the lever member 110, the cam member 140, and the casing members 120, 130 are arranged coaxially in a predetermined phase, respectively, and in this state, provisional provisions are made. The assembly jig pin 170 for stopping is penetrated.

In the present embodiment, as shown in FIG. 10, when the phase formed by the lever member 110a and the casing member 130 corresponding to the initial position (standard position) of the seat back 16 is 0 °, the lever member 110 and the casing are formed. When the phase formed by the member 130 is 17 °, temporary fixing is performed by the assembly jig pin 170. Further, in FIG. 10, the lever member 110b shows a case where the phase formed by the lever member 110b and the casing member 130 is 95 °, and the lever member 110c shows the case where the phase formed by the lever member 110c and the casing member 130 is −. The case of 100 ° is shown.

Further, in the present embodiment, the insertion holes 116a, 116b, 125, 135 of the lever member 110 and the casing members 120, 130 have the same radius of curvature substantially equal to the outer diameter of the assembly jig pin 170. The insertion hole 145 of the cam member 140 has a radius of curvature slightly larger than that of the insertion holes 116a, 116b, 125, 135.

Next, a step of assembling the seatbelt device 10 of the present embodiment to the reclining seat 15 will be described.
As a premise when assembling the seatbelt device 10 to the reclining seat 15, the sensor housing 32 of the acceleration sensor 30 needs to be in an appropriate posture when assembled. Here, since the posture of the sensor housing 32 is adjusted by the cable advancing / retreating mechanism 100 and the cable 13a, the length of the cable advancing / retreating mechanism 100 and the cable 13a is adjusted to the seat back 16 before assembling the seatbelt device 10. It is necessary to adjust to the state corresponding to the initial position (standard position).

That is, it is necessary to temporarily fix the cable advancing / retreating mechanism 100 to a predetermined state and adjust the length of the cable 13a. To perform this temporary fixing, as shown in FIG. 11, assembling jig pins 170 are provided in the insertion holes 116a, 116b, 145, 125, 135 formed in the lever member 110, the cam member 140, and the casing members 120, 130, respectively. To penetrate. By doing so, the lever member 110 and the casing members 120 and 130 can be temporarily fixed by the assembly jig pin 170 so as not to move relative to each other.

At this time, the assembly jig pin 170 is supported on both sides of the cam member 140 by the insertion holes 116a and 116b of the ring plate portions 112a and 112b and the insertion holes 125 and 135 of the pair of casing members 120 and 130. The tilt of the lever member 110 with respect to the pair of casing members 120 and 130 is prevented, and the casing members 120 and 130 and the lever member 110 are temporarily fixed with high positional accuracy.

Next, the cable advancing / retreating mechanism 100 is attached to the reclining seat 15 or a jig corresponding thereto while maintaining this temporarily fixed state. Specifically, the casing members 120 and 130 are fixed to the seat back 16, and the slide plate 118 of the lever member 110 is fixed to the seat cushion 17.

Since the casing members 120 and 130 are formed symmetrically in a mirror plane, and the slide plate 118 of the lever member 110 is arranged at the center of the two ring plate portions 112a and 112b in the axial direction, the front and back sides of the cable advancing / retreating mechanism 100 are provided. The cable advancing / retreating mechanism 100, which has been conventionally prepared exclusively for the right seat side and the left seat side, can be shared by the right seat side and the left seat side. For example, in the left seat shown in FIG. 1B, the casing members 120 and 130 are fixed to the seat back 16 so that the outer surface of the casing member 120 abuts on the seat back 16. Further, in the right seat shown in FIG. 1C, the casing members 120 and 130 are fixed to the seat back 16 so that the outer surface of the casing member 130 abuts on the seat back 16.
Further, the cable fixing plate 180 holds the outer tube 13b and is fixed to the seat back 16.

After that, the assembly jig pin 170 is removed from the insertion holes 16a, 116b, 145, 125, 135. Then, the adjusting screw 160 is adjusted to adjust the position of the cable adjuster 150 in a state where the lever member 110, the cam member 140, and the casing members 120 and 130 are in the phase corresponding to the standard position of the seat back 16. At this time, since the terminal portion of the outer tube 13b is fixed to the casing members 120 and 130, the cable 13a from the terminal portion of the outer tube 13b is moved by moving the end block 13c of the cable 13a via the cable adjuster 150. The withdrawal length (payment) of the can be adjusted appropriately. Then, by properly adjusting the pull-out length of the cable 13a, the sensor housing 32 of the acceleration sensor 30 is adjusted in an appropriate direction.

Specifically, by sliding the cable adjuster 150, after eliminating the slack in the cable 13a, the adjusting screw 160 is tightened in that state, and the head of the adjusting screw 160 is placed on the receiving surface of the screw receiving wall 147 of the cam member 140. The length adjustment of the cable 13a is completed, and the guide rail (not shown) on the cam member 140 side and the guide rail 152 on the cable adjuster 150 side are welded and fixed.

Next, the operation in which the cable advancing / retreating mechanism 100 advances / retreats the cable 13a will be described.
12 to 14 are side views showing the states of the seatbelt retractor and the cable advancing / retreating mechanism for each tilt angle of the seatback. FIG. 12 shows a state when the seat back is tilted backward at a standard posture of 15 °, FIG. 13 shows a state when the seat back is tilted backward at 95 °, and FIG. 14 shows a state when the seat back is tilted forward at 75 °.

When the seat back 16 is tilted, the cable advancing / retreating mechanism 100 can advance / retreat the cable 13a by a length corresponding to the tilt angle of the seat back 16. For example, when the seat back 16 is tilted in the direction of arrow Y1 from the reference posture shown in FIG. 12 to the position shown in FIG. 13, the convex portion 143c of the cam member 140 abuts against the abutting portion 115 of the lever member 110, so that the cam member Although the 140 cannot move, the casing members 120 and 130 rotate together with the seat back 16, so that the outer tube 13b of the cable 13a moves together with the casing members 120 and 130. As a result, the terminal of the cable 13a is pulled out from the outer tube 13b, so that the cable 13a is given a pull-in operation (corresponding to a winding operation for the cable winding groove 144 of the cam portion 143). It is transmitted to the attitude control mechanism 70.

On the contrary, when the seat back 16 is returned from the position shown in FIG. 13 to the position shown in FIG. 14, the casing members 120 and 130 rotate in the opposite direction (arrow Y2 direction), so that the outer tube 13b becomes a cable. Since it is returned to the terminal side of 13a, the cable 13a pulled by the torsion spring 75 of the attitude control mechanism 70 returns to the outer tube 13b, and the cable 13a is pushed out (the cable winding groove 144 of the cam portion 143). Is given (corresponding to a pull-out operation), which is transmitted to the attitude control mechanism 70.

When the seat back 16 is rotated and folded in the direction of arrow Y2 from the position shown in FIG. 12 to the position shown in FIG. 14, the casing members 120 and 130 rotate together with the seat back 16 to rotate the casing member. After the abutting step portions 129 of the 120 and 130 come into contact with one end 143a of the cam portion 143 of the cam member 140, the cam member 140 also rotates together with the casing members 120 and 130, so that the cable 13a is pulled into the outer tube 13b. No action is taken. However, the occupant does not sit on the seat cushion 17 folded in this way, and even if the sensor housing 32 is not maintained in a substantially horizontal state, it does not pose an obstacle.

The center of the cable advancing / retreating mechanism 100 may be slightly displaced from the center of the connecting portion 18 that rotatably connects the seat back 16 and the seat cushion 17. In that case, the center of the cable advancing / retreating mechanism 100 rotates around the center of the connecting portion 18, and the center of the cable advancing / retreating mechanism 100 and the center of the bolt (not shown) for fixing the slide plate 118 to the seat cushion 17. The distance to and from varies with the rotation of the seat back 16. However, this change in distance is absorbed by the slide plate 118 sliding with respect to the guide groove 117 of the plate guide portion 113 of the lever member 110, and does not hinder the rotation of the seat back 16.

When the reclining angle of the seat back 16 is adjusted in this way, the cable 13a advances and retreats by the length corresponding to the reclining angle, and the pulley 73 of the attitude control mechanism 70 rotates according to the advance and retreat of the cable 13a. When the pulley 73 rotates in the same direction as the tilt direction of the seat back 16, the adjust gear 74 rotates in the opposite direction by the same angle as the pulley 73, and the rotation is transmitted to the sensor housing 32 by the pin 74c and the slit 32h. The sensor housing 32 rotates in the opposite direction by the same angle as the tilt angle of the seat back 16, and the inertial body support surface 33 of the sensor housing 32 is held substantially horizontally.

In this state, when a horizontal acceleration larger than a predetermined value acts on the acceleration sensor 30 due to a vehicle collision or the like, the ball 35, which is an inertial body mounted on the inertial body support surface 33, is displaced from the neutral position. As a result, the second sensor lever 37 rotates, this rotation is transmitted to the first sensor lever 36, and the first sensor lever 36 rotates, so that the upper claw portion 36b becomes the engaging claw of the steering wheel 25. Engage with 25a to regulate the rotation of the steering wheel 25, prevent the seatbelt 19 from paying out, and restrain the occupant.

In this way, since the sensor housing 32 is always maintained in a substantially horizontal state in the front-rear direction of the vehicle, the acceleration sensor 30 is suddenly decelerated or decelerated when a gentle deceleration acts in the traveling direction of the vehicle. In any case, such as when the vehicle shifts to deceleration, the acceleration is properly detected and the seat belt 19 is locked without causing a lock delay.

As described above, according to the seatbelt device 10 of the present embodiment, the seatbelt retractor 11 attached to the seatback 16 of the reclining seat 15 and the seatbelt tilting operation of the seatback 16 are performed via the cable unit 13. A cable advancing / retreating mechanism 100 that transmits to the attitude control mechanism 70 of the retractor 11 is provided.
The cable advancing / retreating mechanism 100 includes a lever member 110 that can be fixed to the seat cushion 17, casing members 120 and 130 that can be fixed to the seat back 16 and are rotatably arranged with respect to the lever member 110, and a casing member. The casing members 120 and 130 are in a predetermined range of rotation with respect to the lever member 110 while being rotatable with respect to the lever member 110 and the casing members 120 and 130 so as to be coaxial with the rotation centers of the 120 and 130. Between, that is, while the tilt angle of the seat back 16 is within a predetermined range, the lever member 110 prevents the movement, and the cam member 140 is provided with the cable winding groove 144 around which the cable 13a is wound along the outer peripheral surface. Has.
Further, the lever member 110 includes two ring plate portions 112a and 112b having openings 114a and 114b coaxial with the rotation centers of the casing members 120 and 130, respectively. The ring plate portions 112a and 112b are provided in a state of being separated from each other in the directions along the rotation centers of the casing members 120 and 130, and are connected to the rotation centers of the casing members 120 and 130 on the outer side in the radial direction. The casing.
Further, the ring plate portions 112a and 112b of the lever member 110 and the casing members 120 and 130 are coaxially arranged in a predetermined phase around the rotation center of the casing members 120 and 130, respectively. Insertion holes 116a, 116b and 125, 135 through which the pin 170 is inserted are formed.
As a result, the casing members 120, 130 and the lever member 110 are prevented from being tilted with respect to the casing members 120, 130 and the lever member 110 fitted to the assembling jig pin 170. Can be accurately fixed to the seat back 16 and the seat cushion 17, respectively. Further, the adjustment of the pull-out length of the cable 13a for holding the inertial body support surface 33 of the sensor housing 32 of the acceleration sensor 30 substantially horizontally is performed by the casing members 120, 130 fixed to the seat back 16 and the seat cushion 17. Therefore, it is possible to suppress the mounting angle error of the acceleration sensor 30 and improve the detection accuracy.

Further, the cable advancing / retreating mechanism 100 includes a pair of casing members 120 and 130 provided on the outside of the two ring plate portions 112a and 112b in the direction along the rotation center of the casing members 120 and 130, respectively, and a pair. In the casing members 120, 130, insertion holes 125, 135 are arranged coaxially with the insertion holes 116a, 116b of the ring plate portions 112a, 112b in a predetermined phase around the rotation center of the casing members 120, 130. Therefore, the lever member 110 can be supported on both sides of the cam member 140 by the assembly jig pin 170 inserted into the insertion holes 116a and 116b of the ring plate portions 112a and 112b, and the casing members 120 and 130 can be supported. On the other hand, the tilt of the lever member 110 is further prevented.

Further, the cable advancing / retreating mechanism 100 is provided with a cable adjuster 150 capable of adjusting the position of the terminal portion of the cable 13a with respect to the cam member 140, and the pair of casing members 120 and 130 externally attach the adjusting screw 160 of the cable adjuster 150. Since the slit 111 is adjustable from the above, the adjusting screw 160 can be adjusted while the pair of casing members 120 and 130 are connected to each other.

Further, the two ring plate portions 112a and 112b are provided in a state of being separated from each other in the direction along the rotation center of the casing members 120 and 130 so as to sandwich the cam member 140, and the cam member 140 is assembled. The insertion holes 145 into which the attachment jig pins 170 are inserted are the insertion holes 116a and 116b of the ring plate portions 112a and 112b and the casing member 120 in a predetermined phase around the rotation center of the casing members 120 and 130. Since it is arranged coaxially with each of the insertion holes 125 and 135 of 130, the casing members 120 and 130, the cam member 140, and the lever member 110 can be positioned in a compact configuration.

Further, the lever member 110 includes a plate guide portion 113 that guides the slide plate 118, and is fixed to the seat cushion 17 via the slide plate 118. Further, the two ring plate portions 112a and 112b are connected by the plate guide portion 113 on the outer side in the radial direction with respect to the rotation centers of the casing members 120 and 130. As a result, it is possible to suppress the relative displacement of the two ring plate portions 112a and 112b, and the slide plate 118 makes the center of the cable advancing / retreating mechanism 100 slightly smaller than the center of the connecting portion 18. The displacement can be absorbed.

Further, since the slide plate 118 is located between the two ring plate portions 112a and 112b in the direction along the rotation center of the casing members 120 and 130, the cable advancing / retreating mechanism 100 is shared by the left and right seats. Becomes possible.
That is, in the present embodiment, the cam member 140 and the slide plate 118 are located between the two ring plate portions 112a and 112b in the direction along the rotation center of the casing members 120 and 130, and the lever member 110, specifically. In addition, since the shape is sandwiched between the two ring plate portions 112a and 112b and the plate guide portion 113, it can be used without distinguishing between the left and right seats in terms of function.
In the present embodiment, the cable fixing plate 180 is separately prepared for the left and right seats, but it may be a shared part by forming it in a line-symmetrical shape.

Further, in the present embodiment, the pair of casing members 120 and 130 are used, and the connecting line of the pair of casing members 120 and 130 coincides with the intermediate position in the plate thickness direction of the slide plate 118, and the left and right seats The slide plate 118 is easily positioned on the seat cushion 17 in the thrust direction.

Further, since the insertion holes 116a and 116b of the ring plate portions 112a and 112b are provided on the side opposite to the attachment portion (slide plate 118) to the seat cushion 17 with respect to the rotation center of the casing members 120 and 130. It is possible to prevent the lever member 110 and the casing members 120 and 130 from tilting on both sides with respect to the rotation center of the casing members 120 and 130.

Further, in the method of assembling the seatbelt device 10 of the present embodiment to the reclining seat 15, the insertion holes 116a, 116b, 125, 135 of the ring plate portions 112a, 112b and the casing members 120, 130 are coaxially respectively. The lever member 110 and the casing members 120 and 130 are relatively rotated so as to be arranged, and the assembly jig pin 170 is inserted into the insertion holes 125 and 135 of the casing members 120 and 130 and the insertion holes of the lever member 110. The lever member 110 is fixed to the seat cushion 17 and the casing members 120 and 130 are fixed to the seat back 16 while being inserted into the 116a and 116b. As a result, the cable advancing / retreating mechanism 100 can be assembled to the reclining seat 15 while the positional accuracy of the casing members 120, 130 and the lever member 110 is properly maintained, and the detection accuracy of the acceleration sensor 30 is improved.

The present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, and the like.

For example, in the above embodiment, the cable advancing / retreating mechanism 100 has a mirror-symmetrical configuration that can be shared by the left and right seats, but the cable advancing / retreating mechanism of the present invention is assembled and cured by two ring plate portions of the lever member. Anything that can prevent the tilt of the jig pin may be used, and the present invention is not limited to this embodiment.

Further, in the present embodiment, the cable advancing / retreating mechanism 100 includes a pair of casing members 120 and 130, and insertion holes 125 and 135 are arranged in the pair of casing members 120 and 130, respectively. Is not limited to this. That is, the cable advancing / retreating mechanism 100 may have only the casing member on the side fixed to the seat back 16. Further, the insertion hole may be formed only in one of the pair of casing members 120 and 130.

Further, in the present embodiment, the lever member 110, the cam member 140, and the casing members 120, 130 are provided with insertion holes 116a, 116b, 145, 125, 135 through which the assembly jig pin 170 penetrates, respectively. , The present invention is not limited to this. For example, the lever member 110 and the casing members 120, 130 may be provided with insertion holes 116a, 116b, 125, 135 at positions where the cam member 140 is not sandwiched. In this case, the cam member 140 may not be provided with the insertion hole 145.

Further, the lever member of the present invention may have a configuration that does not use a slide plate, and in that case, the attachment portion of the lever member to the seat cushion may be directly attached to the seat cushion 17.

Further, in the seatbelt device 10 of the present invention, the slide plate 118 is located in the middle of the plate guide portions 113 in the direction along the rotation centers of the casing members 120 and 130, so that the cable advancing / retreating mechanism 100 is left and right. It will be possible to share it in the seat.
That is, in the seatbelt device of the present invention, the cable advancing / retreating mechanism includes a lever member, a casing member, and a cam member, the lever member is fixed to the seat cushion via a slide plate, and the lever member is A plate guide portion that guides the slide plate and a ring plate portion that is connected to the plate guide portion on the outer side in the radial direction with respect to the rotation center of the casing member and has an opening coaxial with the rotation center of the casing member. The plate is located in the middle of the plate guide portion in the direction along the rotation center of the casing member. With the above configuration, the cable advancing / retreating mechanism can be shared by the left and right seats, and the structure is not limited to the structure in which the lever member 110 has two ring plate portions 112a and 112b as in the above embodiment.

This application is based on a Japanese patent application filed on February 20, 2017 (Japanese Patent Application No. 2017-029275), the contents of which are incorporated herein by reference.

10 Seatbelt device 11 Seatbelt retractor 13 Cable unit 13a Cable 15 Reclining seat 16 Seatback 17 Seat cushion 18 Connecting part 19 Seatbelt 22 Spindle 24 Lock mechanism 30 Acceleration sensor 70 Attitude control mechanism 100 Cable advance / retreat mechanism 110 Lever member 111 Slit 112a, 112b Ring plate portion 113 Plate guide portion 114a First opening (opening)
114b Second opening (opening)
116a, 116b, 125, 135, 145 Insertion hole 117 Guide groove (plate guide part)
118 Slide plate 120, 130 Casing member 140 Cam member 144 Cable winding groove 170 Assembly jig pin θ Predetermined angle (tilt angle)

Claims (9)

A spindle that winds up the seatbelt, an acceleration sensor that detects acceleration in the front-rear direction of the vehicle, a lock mechanism that locks the pull-out operation of the seatbelt according to the acceleration detected by the acceleration sensor, and an attitude of the acceleration sensor. A seatbelt retractor that has an attitude control mechanism that controls the seatbelt and is attached to the seatback of the reclining seat provided in the vehicle.
It is arranged at a connecting portion that rotatably connects the seat back of the reclining type seat and the seat cushion, detects the tilt angle when the seat back tilts in the front-rear direction of the vehicle, and sets the tilt angle to the seat belt retractor. It has a cable for transmitting, and the tilting operation of the seat back is performed via the cable by moving the cable forward or backward in the length direction of the cable for a distance corresponding to the tilt angle of the seat back. A cable advancing / retreating mechanism that transmits to the attitude control mechanism of the seatbelt retractor,
With
The attitude control mechanism controls the posture of the acceleration sensor according to the advancing / retreating operation of the cable accompanying the tilting of the seat back, so that the acceleration sensor is kept constant within a predetermined range regardless of the tilt angle of the seat back. A seatbelt device that holds in the basic posture
The cable advancing / retreating mechanism is
A lever member that can be fixed to the seat cushion and
A casing member that can be fixed to the seat back and is rotatably arranged with respect to the lever member.
The lever member and the casing member are rotatable coaxially with the rotation center of the casing member, while the casing member is within a predetermined range of rotation with respect to the lever member. A cam member whose movement is blocked by the lever member and which is provided with a cable winding groove for winding the cable along the outer peripheral surface.
Have,
The lever member includes at least two ring plate portions each having an opening coaxial with the rotation center of the casing member.
The at least two ring plate portions are provided in a state of being separated from each other in the direction along the rotation center of the casing member, and are connected to the rotation center of the casing member on the outer side in the radial direction.
Insertion holes through which assembly jig pins are inserted are formed in each of the ring plate portions of the lever member and the casing member, respectively.
A seatbelt device, wherein each ring plate portion and each insertion hole of the casing member are coaxially arranged in a predetermined phase around a rotation center of the casing member. The casing member includes a pair of casing members provided on the outside of at least two ring plate portions in a direction along the rotation center of the casing member.
The pair of casing members are characterized in that the insertion holes are arranged coaxially with the insertion holes of the ring plate portions in the predetermined phase around the rotation center of the casing member. The seatbelt device according to claim 1. The at least two ring plate portions are provided so as to sandwich the cam member in a state of being separated from each other in a direction along the rotation center of the casing member.
In the cam member, an insertion hole into which an assembly jig pin is inserted is coaxial with each ring plate portion and each insertion hole of the casing member in the predetermined phase around the rotation center of the casing member. The seatbelt device according to claim 1, wherein the seatbelt device is arranged above. The lever member is fixed to the seat cushion via a slide plate.
The lever member includes a plate guide portion for guiding the slide plate.
The one according to any one of claims 1 to 3, wherein the at least two ring plate portions are connected by the plate guide portion on the outer side in the radial direction with respect to the rotation center of the casing member. Seat belt device. The seatbelt device according to claim 4, wherein the slide plate is located between the two ring plate portions in a direction along the rotation center of the casing member. Any one of claims 1 to 5, wherein each insertion hole of each ring plate portion is provided on the side opposite to the attachment portion to the seat cushion with respect to the rotation center of the casing member. The seat belt device according to the section. A method of assembling a seatbelt device for assembling the seatbelt device according to any one of claims 1 to 6 to the reclining seat.
The lever member and the casing member are relatively rotated so that the ring plate portion and the insertion holes of the casing member are arranged coaxially.
The lever member is fixed to the seat cushion, and the casing member is fixed to the seat back, with the assembly jig pin inserted into the insertion holes of the casing member and the lever member. How to assemble the seatbelt device. A spindle that winds up the seatbelt, an acceleration sensor that detects acceleration in the front-rear direction of the vehicle, a lock mechanism that locks the pull-out operation of the seatbelt according to the acceleration detected by the acceleration sensor, and an attitude of the acceleration sensor. A seatbelt retractor that has an attitude control mechanism that controls the seatbelt and is attached to the seatback of the reclining seat provided in the vehicle.
It is arranged in a connecting portion that rotatably connects the seat back of the reclining type seat and the seat cushion, detects the tilt angle when the seat back tilts in the front-rear direction of the vehicle, and applies the tilt angle to the seat belt retractor. It has a cable for transmitting, and the tilting operation of the seat back is performed via the cable by moving the cable forward or backward in the length direction of the cable for a distance corresponding to the tilt angle of the seat back. A cable advancing / retreating mechanism that transmits to the attitude control mechanism of the seatbelt retractor,
With
The attitude control mechanism controls the posture of the acceleration sensor according to the advancing / retreating operation of the cable accompanying the tilting of the seat back, so that the acceleration sensor is kept constant within a predetermined range regardless of the tilt angle of the seat back. A seatbelt device that holds in the basic posture
The cable advancing / retreating mechanism is
A lever member that can be fixed to the seat cushion and
A casing member that can be fixed to the seat back and is rotatably arranged with respect to the lever member.
The lever member and the casing member are rotatable coaxially with the rotation center of the casing member, while the casing member is within a predetermined range of rotation with respect to the lever member. A cam member whose movement is blocked by the lever member and which is provided with a cable winding groove for winding the cable along the outer peripheral surface.
Have,
The lever member is fixed to the seat cushion via a slide plate.
The lever member is connected to the plate guide portion that guides the slide plate and the plate guide portion on the outer side in the radial direction with respect to the rotation center of the casing member, and is an opening coaxial with the rotation center of the casing member. With a ring plate part with
A seatbelt device characterized in that the slide plate is provided in a guide groove located at a central position of the plate guide portion in a direction along a rotation center of the casing member. The lever member includes at least two ring plate portions each having the opening coaxial with the rotation center of the casing member.
The at least two ring plate portions are provided so as to be separated from each other in the direction along the rotation center of the casing member, and the plate guide portion is radially outside the rotation center of the casing member. Connected with
The seatbelt device according to claim 8, wherein the slide plate is located between the two ring plate portions in a direction along the rotation center of the casing member.

Images