JPH10175510A - Acceleration sensor device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase sensitivity (decrease a static lock angle) when the whole of a vehicle body is inclined even in a case of an acceleration sensor device to vary an attitude to a car body. SOLUTION: A bracket 28 is rotatably supported at a housing fixed on the car body side, and a sensor ball 30 to drive an output member brought into inertia movement according to acceleration exerted on a vehicle is placed on the ball support part, formed in the shape of a truncated cone, of the bracket 28. The bracket 28 is brought into a constant attitude through rotation of the bracket 28 by a weight 26 attached to the bracket 28. Rotation operation of the bracket relative to a housing is blocked or rotatably released in correspondence to mounting and demounting of a buckle and operation of a lever or through operation of it by a control device or by bracing means corresponding to webbing tension detecting means and rotation direction detecting means for a spool axis in a retracter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle acceleration sensor device used for a retractor for a seat belt device mounted on a vehicle.

[0002]

2. Description of the Related Art Generally, when a large acceleration is applied to a vehicle, a vehicle acceleration sensor for detecting a large acceleration of a predetermined value or more applied to the vehicle to prevent the webbing from being pulled out from the retractor of the seat belt device. Is installed.

[0003] Devices having such a vehicle acceleration sensor device, for example, a seat belt retractor, are mounted on a portion fixed to the vehicle body such as a center pillar or a seat cushion of the vehicle. I have.

[0004] Conventionally, in response to a request to use this acceleration sensor on a portion where the angle of the vehicle with respect to the vehicle body is changed, such as a seat back retractor of a reclining seat, for example, the seating posture is changed and adjusted. Even if the mounting posture of the acceleration sensor device is changed, in order to detect the set acceleration to be detected by the acceleration sensor device, FIG.
Also, an impact sensing device as shown in FIG. 17 has been proposed.
In this shock sensing device, the position of the center of gravity
Since the apparatus is below the rotation center C of 10, the entire apparatus is inclined about the rotation center C with respect to the bracket 512, and its axis coincides with the vertical line A ₀ -A ₀ . In this state, since the rocker 514 is not rotationally displaced with respect to the intermediate member 510, the rod 516 is not raised relative to the weight 518. Further, since the inner peripheral surface of the transmission member 520 forms a spherical surface around the rotation center C, the transmission member 520 is not pushed up by the rod 516, and the claw 522 is separated from the gear 524. That is, the seat belt webbing 526 can be pulled out. If an impact acts on the vehicle in this state, the bracket 5
As in the state shown in FIG. 16 in which the rod 12 is horizontal, the rocker 514 rotates relative to the intermediate member 510, the rod 516 is lifted, and the pawl 52 is moved through the transmission member 520.
2 is rotated upward. As a result, the pawl 522 becomes the gear 52
4 and the seat belt webbing 526 is locked.

As described above, the axis of the intermediate member 510 always coincides with the vertical line in normal times when no impact is applied, and the magnitude of the impact is reduced by the relative rotational displacement between the oscillator 514 and the intermediate member 510 generated at the time of the impact. It is designed to sense. Therefore, it does not sense a change in the mounting state, but only the impact force. In this case, since the intermediate member 510 swings in the direction opposite to the swinging element 514, the relative rotational displacement thereof is relatively large, and the impact force can be reliably detected.

[0006]

In the above-described impact sensing device shown in FIGS. 16 and 17 capable of changing the mounting posture with respect to the vehicle body, even if the seat back of the reclining seat to which the mounting is mounted is inclined, In addition, since the same operation is performed even when the entire vehicle body is inclined, the sensitivity when the entire vehicle body is inclined must be low (the so-called static lock angle is large). On the other hand, an acceleration sensor device mounted on a part fixed to a general vehicle body has a high sensitivity when the entire vehicle body is tilted so as to operate when the entire vehicle body is tilted at a predetermined small angle (a so-called static sensor). The lock angle is set to be small).

In consideration of the above points, the present invention has increased the sensitivity when the entire vehicle body is tilted (the static lock angle is reduced) even if the attitude of the vehicle body can be changed.
An object of the present invention is to newly provide an acceleration sensor device.

[0008]

According to a first aspect of the present invention, there is provided a vehicle acceleration sensor device for driving an output member by inertially moving an inertial body according to acceleration applied to a vehicle. A housing fixed to the vehicle body, a bracket rotatably supported around a rotation axis of the housing, and the bracket owing to its own weight even when the housing is mounted at a different angle to the vehicle body. A weight provided on the bracket so that the bracket is rotated around the rotation axis so as to take a fixed posture around the rotation axis, and a rotation operation of the bracket with respect to the housing is suppressed. Or a braking means which is freely released to rotate.

With the above-described structure, when the occupant sits on the reclining seat provided with the retractor and performs the reclining operation of the seat back, an appropriate acceleration is detected in accordance with the inclination of the seat back. The bracket pivots to gain. After that, in response to the attachment and detachment of the buckle of the seated occupant, the operation of the lever, etc., or at a required timing, the control device operates
Or in the retractor, webbing tension detecting means,
The bracket is fixed at a position corresponding to the inclination of the seat back in accordance with the rotation direction detecting means of the spool shaft. When the entire vehicle body is inclined at a predetermined small angle, the sensitivity is sensitive (the static lock angle is small). Work).

A vehicle acceleration sensor device according to a second aspect of the present invention is a vehicle acceleration sensor device for driving an output member by inertially moving an inertial body in accordance with acceleration applied to a vehicle, wherein A housing fixed to the housing, a bracket rotatably supported around a rotation axis of the housing, and the bracket being attached to the rotation axis by its own weight even if the housing is attached to the vehicle body at a changed angle. A weight provided on the bracket so that the bracket is rotated around the rotation axis of the bracket so as to take a fixed posture, and a buckle device in the seat belt device is engaged with a buckle device. Stopping the rotation of the bracket relative to the housing, and allowing the bracket to rotate freely when the attachment is removed from the buckle device. And having a braking means for releasing, the.

With the above configuration, when the occupant sits on the reclining seat provided with the retractor and performs the reclining operation of the seat back, an appropriate acceleration can be detected in accordance with the inclination of the seat back. The bracket rotates. Thereafter, when the seated occupant wears the seat belt webbing, when the fastening device is engaged with the buckle device, the rotation of the bracket with respect to the housing is stopped, and the bracket corresponds to the inclination of the seat back. And operates with sensitive sensitivity (to reduce the so-called static lock angle) when the entire vehicle body is tilted at a predetermined small angle.

According to a third aspect of the present invention, there is provided an acceleration sensor device for a vehicle for driving an output member by inertially moving an inertial body in accordance with an acceleration applied to a vehicle, and fixed to a vehicle body. A housing, a bracket rotatably supported around the axis of rotation of the housing, and the bracket by its own weight around the axis of rotation even if the housing is mounted at a different angle to the vehicle body. A weight provided on the bracket so as to rotate the bracket to take a fixed posture around the rotation axis center, and a rotating operation of the bracket with respect to the housing is subjected to tension for pulling out webbing in a retractor. When the tension is detected when the webbing is pulled out, the bracket is freely released when the tension is detected. And braking means, characterized by having a.

[0013] With the above configuration, the occupant sits on the reclining seat provided with the retractor, performs the reclining operation of the seat back, and thereafter,
When the seated occupant detects the tension at the time of pulling out the webbing in the retractor for wearing the seat belt webbing, the braking means releases the bracket so as to be freely rotatable. The bracket is rotated so that the position can be detected. further,
When the installation of the seat belt webbing is completed and the tension for pulling out the webbing is lost, the braking means stops the pivoting operation of the bracket with respect to the housing, and the bracket is fixed at a position corresponding to the inclination of the seat back, and When the whole is tilted at a predetermined small angle, it operates with a sensitive sensitivity (so that the so-called static lock angle becomes small).

An acceleration sensor device according to a fourth aspect of the present invention is a vehicle acceleration sensor device for driving an output member by inertially moving an inertial body in accordance with acceleration applied to a vehicle, the acceleration sensor device being fixed to a vehicle body. A housing, a bracket rotatably supported around the axis of rotation of the housing, and the bracket by its own weight around the axis of rotation even if the housing is mounted at a different angle to the vehicle body. A weight provided on the bracket so as to rotate the bracket so as to take a fixed posture around the rotation axis center, and a rotating operation of the bracket with respect to the housing, a spool shaft in the retractor is moved in a webbing pull-out direction. The bracket is stopped when rotating or stopping, and when rotating in the direction in which the webbing is wound. And having a braking means for releasing rotate freely, the.

[0015] With the above configuration, the occupant sits on the reclining seat provided with the retractor, performs the reclining operation of the seat back, and thereafter,
When the occupant finishes the operation of mounting the webbing in the retractor in an excessively pulled state in order to mount the seat belt webbing, the webbing W is mounted on the occupant without looseness by the action of the spring of the retractor. At the time of this webbing W winding operation, the bracket is freely released by the braking means, so that in response to the inclination of the seat back,
The bracket rotates so that an appropriate acceleration can be detected.
Further, when the occupant wearing the webbing moves his / her body as a normal operation, the braking means stops the turning operation of the bracket with respect to the housing, and the bracket is fixed at a position corresponding to the inclination of the seat back. When the whole is tilted at a predetermined small angle, it operates with a sensitive sensitivity (so that the so-called static lock angle becomes small).

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

(Overall Configuration of Seat Belt Retractor) FIGS. 1 to 9 show a first embodiment in which the vehicle acceleration sensor device of the present invention is configured as an acceleration sensor of a retractor used in a seat belt device.

As shown in FIG. 1, a shaft supporting side portion 12 which is one of retractor bases 12 for supporting both ends of a shaft 10 of a spool around which a seat belt webbing is wound.
A is provided with a lock mechanism 14 and an acceleration sensor body 16. Further, as shown in FIG. 2, an upper cover 18 for accommodating the lock mechanism 14 and the acceleration sensor main body 16 is attached to the shaft supporting side surface 12A. (Configuration of Acceleration Sensor Device) As shown in FIG. 2, the acceleration sensor main body 16 is mounted on a substantially elliptical opening 20 formed in the shaft supporting side surface portion 12A of the retractor base 12. The acceleration sensor body 16 includes a sensor cover 22
A weight 26, a bracket 28, and an inertia sensor ball 3
0, the first pawl 32, and the second pawl 34 are mounted.

As shown in FIG. 3, the sensor cover 22
A cylindrical peripheral wall 38 is erected at a right angle from the periphery of the flat plate portion 36 having a shape similar to the opening 20 of the shaft supporting side surface portion 12A and slightly smaller than the periphery thereof, and a flange extending outward at a right angle from the opening end of the peripheral wall 38. The unit 40 is provided integrally.

The flange portion 4 of the sensor cover 22
3 is cut out over a small area to form a cutout portion 42. Each cutout portion 42 extends from the peripheral wall 38 into a rectangular tongue piece. A projecting engaging piece 44 is integrally provided. At the free end of each of the engaging projections 44, there is formed a mooring portion 46 having a slope formed so as to be tapered in a hook shape protruding outward.

The hanger 24 assembled to the sensor cover 22 is integrally formed with a semi-cylindrical peripheral side wall 50 so as to extend perpendicularly from an arc-shaped peripheral end of a front semi-circular front plate portion 48. By doing so, the inside of the bracket 2
8 are formed. Furthermore, the front plate 4
At the center of each oblique side portion 48B extending in the radial direction and forming an obtuse angle, a small semicircular bearing plate portion 48A protrudes integrally. A small circular shaft hole 52 is formed in the bearing plate portion 48A.

At both ends of the peripheral side wall 50 of the hanger 24, rectangular plate-shaped fixing portions 54 are integrally provided, respectively.
The end opposite to the front plate portion 48 is bent outward at right angles and extends, and each free end has a fixing pin 5.
6 are protrudingly provided. In each fixing portion 54, a shallow groove is formed in a side surface portion facing inward of the peripheral side wall 50 from the front plate portion 48 side to an intermediate portion thereof. The engaging projection 44 is formed in a stepped shape that rises at a right angle from the bottom surface of the base.

The hanger 24 configured as described above is shown in FIG.
3, the free end of the peripheral side wall 50 is brought into contact with the flange portion 40 of the sensor cover 22, and as shown in FIG. The housing of the acceleration sensor main body 16 is configured to be integrally combined with the sensor cover 22.

A bracket 28 supported inside a housing constituted by the sensor cover 22 and the hanger 24
Is made of a synthetic resin, and at both ends in the diametrical direction of a base portion 62 having a ball receiving portion 60 which is a truncated cone-shaped concave portion with a top portion down, on the side where the ball receiving portion 60 is located (upper side in FIG. 3). A support plate 64 extending toward the support plate and a support support plate 66 are provided integrally. The support plate 64 is provided integrally with a small hook-shaped mooring portion 68 bent toward the ball receiving portion 60 at the free end of the rectangular small plate, and further, the opposite side of the support plate 64 from the ball receiving portion 60. A shaft pin 70 having a long columnar shape is integrally provided at a central portion of the outer side surface.

The support support plate 66 has support columns 72 integrally formed on both sides of the rectangular small plate, and a bearing hole 74 is coaxially formed at a free end of the support column 72. In addition, a small cylindrical shaft pin 76 (FIG. 7) is integrally protruded from the center of the outer surface of the support support plate 66 opposite to the ball receiving portion 60.

These two shaft pins 70 and 76 have their center lines coaxial, and this center line is
It is arranged so as to be a rotation axis X passing through the center of the sensor ball 30 placed on the zero in a normal state. That is, since these shaft pins 70 and 76 become the rotation axis of the bracket 28, the rotation axis of the bracket 28 is set so as to pass through the center of the sensor ball 30 at the normal position.

As shown in FIG. 3, this one shaft pin 70
Is rotatably supported by the shaft hole 52 of the hanger 24. The other shaft pin 76 is connected to the flat plate portion 3 of the sensor cover 22.
6 is supported by a cylindrical bearing portion 78 integrally protruding from the center. Thereby, the bracket 28 is rotatably mounted inside the housing formed by combining the sensor cover 22 and the hanger 24.

The ball receiving portion 60 of the bracket 28
Weight engaging portions 80 are integrally provided at both ends in the diameter direction orthogonal to the rotation axis X. In each of the weight engaging portions 80, rectangular base portions 82 are integrally protruded from both side portions of the ball receiving portion 60, and extending directions of the mooring portions 68 and the support columns 72 from a central portion on the outer lower side. In the opposite direction (downward in FIG. 3), a tongue-shaped engaging piece 84 is integrally provided to protrude. Further, at the free end of the attachment piece 84, an engagement protrusion 86 protruding in a hook shape toward the ball receiving portion 60 is integrally formed.

The weight 26 is integrally assembled with the bracket 28. The weight 26 is made of metal, and a U-shaped counterweight 90 is provided on one side of a base plate 88 that is assembled such that the bottom surface of the bracket 28 opposite to the ball receiving portion 60 is inserted into the recess. It is formed integrally with the rotation axis X so as to have a target shape. Further, at both corners of the other side surface of the base 88, a small prism-shaped support pillar 92 for mounting the bracket 28 described later is integrally erected. At positions between the respective counterweight portions 90 and the respective support pillar portions 92 of the base plate portion 88, a part of the base plate portion 88 is formed as an engaging groove formed in a rectangular groove shape having a step portion 94 </ b> A. 94 are drilled.

The weight 26 thus constructed is provided between the pair of counterweight portions 90 by the bracket 28.
Is inserted between the pair of support columns 92, the support column 72 integral with the support support plate 66 is inserted, and the base 82 is inserted between each counterweight 90 and each support column 92. The weight portion 90 is integrally assembled with the bracket 28 by one-touch by inserting the engagement pieces 84 through the engagement grooves 94 and engaging the engagement protrusions 86 with the step portions 94A. Can be

In the counterweight portion 90, a step portion 96 is formed at an intermediate position between the outer side surfaces of the respective columnar portions, and the step portion 96 is formed to protrude outward, and the weight 26 integrated with the bracket 28 rotates. When each step 96
Are in contact with the corresponding side portions 48B to limit the rotation range of the bracket 28.

In the ball receiving portion 60 of the bracket 28,
A sensor ball 30, which is a metal sphere having a diameter of about 12.7 mm, is mounted so as to roll on a slope. The second pawl 34 is mounted on the bearing hole 74 of the support portion 72 of the bracket 28. The second pawl 34 has a beam portion 100 integrally extended from a head 98 having a circular dish-down shape, and a shaft pin portion 102 formed in a T shape with respect to a free end of the beam portion 100. Is provided.

The second pawl 34 is a driven pawl shown in FIG. 7 in which a shaft pin 102 which is a center of rotation is inserted into a bearing hole 74 and a truncated conical recess is formed in a lower surface of a head 98 thereof. The sensor 104 is mounted so that the concave portion 104 is put on the sensor ball 30.

As shown in FIG. 3, the head 98 of the second pawl 34 is provided with a small rectangular protruding stopping projection 106 projecting therefrom. The support plate 64 is movably faced to a position between the mooring portion 68 and the base portion 62. When the bracket 28 rotates so as to be inclined with respect to the horizontal direction or when acceleration acts,
The sensor ball 30 rolls on the frusto-conical slope of the ball receiving portion 60 and rides on the outer peripheral side, and rolls on the outer peripheral side of the driven concave portion 104 of the head 98 to form the second
When the pawl 34 is moved so as to be separated from the ball receiving portion 60, the stopping protrusion 106 is locked by the mooring portion 68, and the gap between the outer peripheral portion of the ball receiving portion 60 and the outer peripheral portion of the driven concave portion 104. Is smaller than the diameter of the sensor ball 30, and the ball receiving portion 60 and the
4, so that the sensor ball 30 does not fall off. A small protrusion for operating the first pawl 32 is provided at the center of the upper surface of the head 98 of the second pawl 34, which is rotated upward by a small angle by the sensor ball 30, on the side opposite to the driven concave portion 104. The part 105 is integrally protruded.

The first pawl 32 is formed so that one end of the beam-shaped portion 108 arranged in the lateral direction is raised at a right angle to form a side shape in which an L-shape is laid horizontally. This first
A cylindrical bearing hole 110 is provided integrally with a part of the beam-like portion 108 of the pawl 32. In addition, a locking claw 112 that protrudes to one side in a trapezoidal plate shape is formed integrally with a free end that rises at a right angle from the beam-shaped portion 108, and the locking claw 112 does not protrude. A small protrusion-shaped movement range restricting portion 114 is protrudingly provided in the vicinity of the side surface portion. In a portion between the bearing hole portion 110 and the locking claw portion 112 in the beam-shaped portion 108, a receiving surface portion 116 protruding in the same direction as the direction in which the locking claw portion 112 protrudes is provided. The receiving surface portion 116 is curved so as to be convex in the extending direction of the locking claw portion 112 so that the small protrusion portion 105 is brought into sliding contact with the receiving surface portion 116, and is formed in an arc surface around the rotation axis X. A contact surface portion 118 is provided.

As shown in FIG. 2, FIG. 3, and FIG.
A brake holding portion 120 is provided integrally with the beam-like portion 108 of the pawl 32 on a side opposite to the locking claw portion 112 and on a free end side with respect to the bearing hole portion 110. This braking holding unit 120
Is formed in a substantially circular arc shape on the front, and the locking claw 11
A portion near the side of the extension side (upper side in FIG. 6) of No. 2 is left as a rectangular protruding stopper-shaped stopper protruding portion 122, and the other portion is cut out in a trapezoidal plane and recessed in the back side in FIG. A contact surface portion 124 is formed. The first pawl 32 configured as described above is provided in the bearing hole 110 with the flange portion 4 of the sensor cover 22.
A round shaft bar 126 protruding from 0 is passed through and axially mounted. In the flange portion 40, a column 128 is provided upright in parallel with the round shaft 126 near the outside of the free end of the brake holding portion 120 of the first pawl 32 that is mounted on the round shaft 126. . The free end of the support 128 is attached to the support 12
A holding portion 130 formed in a hook shape is formed integrally so as to be bent in a direction perpendicular to the axis 8 and to reach the sliding contact surface portion 124.

The holding portion 130 is pressed so as to slide on the sliding surface portion 124, and the first pawl 32 is
6 so that it does not fall off.
The hitting of the stop projection 122 limits the range of rotation of the first pawl 32 in a direction away from the second pawl 34 (direction of arrow A). Further, as shown in FIG.
When the pawl 32 rotates in the direction opposite to the arrow A, the operation range restricting portion 114 hits the stopping protrusion 132 protruding from the flange portion 40 and further approaches the second pawl 34. (The direction opposite to arrow A) is restricted so as not to rotate. Therefore, as can be seen from FIG. 6 and FIG.
The pawl 32 is positioned at the position where the pawl 32 is stopped by the stopping protrusion 122 and the holding unit 130, the operation range limiting unit 114 and the stopping protrusion 13.
2 is freely rotatably supported in a range between the position where the holding portion 130 is stopped by the holding portion 130 and the sliding contact surface portion 1 within the range.
The first pawl 32 is prevented from falling out of the round shaft 126 by pressing the sliding contact surface portion 124 without coming off the slide shaft 24.

Further, the bracket 2 mounted inside a housing constituted by the sensor cover 22 and the hanger 24
In a normal use state in which the sensor ball 30 is placed in the ball receiving portion 60, the center of gravity of the entire portion supported by the shaft pins 70 and 76 is Since the ball receiving portion 60 is positioned vertically below the rotation axis of the ball 76, the ball receiving portion 60 is kept horizontal even when the posture of the housing is inclined, that is, the virtual vertical axis VC perpendicular to the ball receiving portion 60 horizontal imaginary line. The bracket 28 automatically adjusts around the rotation axis X so as to be held vertically.

As shown in FIG. 7, a recess 60A is formed at the center of the ball receiving portion 60.
The configuration is such that the sensor ball 30 is stably mounted on the portion of 0A.

Further, as shown in FIG. 8, the counterweight portion 90 is supported by the shaft pins 70 and 76 when an acceleration in a direction perpendicular to the rotation axis X of the shaft pins 70 and 76 and in the horizontal direction is applied. Bracket 28 and weight 2 received
6, the inertia moment vertically below the rotation axis X of the counterweight 90 is offset by the inertia moment vertically above the rotation axis X of the counterweight portion 90, so that the turning operation of the bracket 28 is suppressed.

As shown in FIG. 2, the housing part of the acceleration sensor body 16 has two fixing pins 56
One is passed through a through hole 134 adjacent to the opening 20 of the shaft supporting side surface portion 12A, and the other fixing pin 56 is passed through a long groove 136 formed in a part of the opening 20 to be disposed at a predetermined position. I have. The first pawl 32 of the acceleration sensor main body 16 arranged as described above is located adjacent to the lock mechanism 14 as shown in FIG.
6 performs the acceleration detection operation, the first pawl 32
The locking claw 112 is locked to the V gear 138 of the lock mechanism 14 having a generally used configuration, and the V gear 138 is turned in the direction of the arrow E (webbing pull-out rotation direction). Stop movement.

As shown in FIG. 1, when the webbing W is pulled out by a small amount in a state where the rotation of the V gear 138 in the direction of arrow E is stopped by the first pawl 32, the spool shaft 1
0 rotates in the webbing pull-out rotation direction by a small amount. Then, the spool shaft 10 and the V gear 138 rotate relatively, and a pair of lock pieces 14 attached to the spool shaft 10 side.
0, the pin 146 protruding from the side
8 is moved by being slid in the cam groove 148 of the shaft 8 so that the tooth 142 of the lock piece 140 is moved to the side of the shaft supporting side 1.
It is configured to mesh with a lock internal tooth portion 144 in the form of an internal gear formed in 2A to prevent the rotation of the spool shaft 10 in the webbing W pull-out direction. The lock mechanism 14
For example, any of various other structures that can stop the webbing withdrawal by operating the acceleration sensor body may be used. (Structure of Braking Means) As described above, the bracket 28 supported by the sensor cover 22 and the hanger 24 so as to freely rotate by a predetermined angle stops the rotation under predetermined conditions or freely rotates. A braking means for releasing is mounted.

As shown in FIG. 3, this braking means includes a spring clutch 150 attached to a shaft pin 70 extending from a shaft hole 52 of a bearing plate 48A of the hanger 24, a lever member 152 and an operation actuator 200. Have.

The spring clutch 150 is a torsion coil spring.
The coil portion 150A is wound so that the shaft pin 70 is elastically tightened so that the two do not rotate relative to each other in a state where a load is not applied to the spring clutch 150, and is integrally held. It is configured to be. Further, one end 150B of the spring clutch 150 extending from the coil portion 150A is inserted into and engaged with a through hole 156 formed at a predetermined position in the plane of the front plate 48, and the other end 150C is connected to the other end 150C. Lever member 15
2 and is engaged by being inserted through a through hole 158 formed in the second hole.

The lever member 152 is a substantially elliptical small plate member, and at one end thereof is provided a shaft cylinder 160 having a shaft hole into which the shaft pin 70 is inserted. Further, at the other end of the lever member 152, a round bar-shaped driven bar 162 is provided so as to be interlocked with the operation actuator 200.

As shown in FIG. 1 to FIG. 5, the operation actuator 200 is constituted by, for example, an electric actuator which operates to extend and contract the rod 202 in response to a command signal or an electric output. It is installed. The tip of the rod 202 is formed in an annular shape,
A driven bar 162 is axially inserted in the hole of the ring.

A wiring 206 is connected to the operation actuator 200 so that an output signal is sent from a buckle device 204 for a seat belt to control the operation thereof, and a control circuit is formed. In this control circuit, the buckle device 204 includes a seat belt webbing 209 for wearing.
An output signal generated by the buckle device 204 is transmitted to the operation actuator 200 via the wiring 206 when the fastening tool 208, which is a tongue plate that is locked, is inserted and engaged, and the rod 202 of the operation actuator 200 is The buckle device 20 is extended when the fastener 208 is released from the buckle device 204.
The actuator 200 receiving the output signal generated in step 4
The rod 202 is configured to perform a retracting operation.

The above-described control circuit only needs to be able to cause the operating actuator 200 to extend and retract the rod 202, and may be constituted by an electronic circuit or the like using a microcomputer. In addition, the above-described braking means can take various configurations such as stopping the pivoting operation of the bracket 28 with respect to the housing, or contacting and stopping the bracket 28 as long as it can be freely released. It is. (Operation and Operation of First Embodiment) Next, the operation and operation of the acceleration sensor device according to the first embodiment configured as described above will be described. First, in a non-use state of the seat belt device in which the fastening device 208 is removed from the seat belt buckle device 204 shown in FIG. 5, the operation actuator 20 receiving the output signal from the buckle device 204 is used.
0 retracts the rod 202 and the rod 202
The lever member 152 is turned from the vertical position in the direction of arrow G via the driven bar 162 connected to the tip of the lever 152. In this state, the spring clutch 150
Of both ends 150B, 150C
Is moved in the unwinding direction, the inner diameter of the coil portion 150A increases, and a gap H is formed between the coil portion 150A and the outer peripheral surface of the shaft pin 70. The shaft pin 70 is freely rotatable with respect to the spring clutch 150. It is set to the released unbound state. In this state, as shown in FIG.
When the inclination angle of the seat back B of the reclining seat S mounted in the vehicle is adjusted, as can be seen from FIGS. 1 and 6, the acceleration of the retractor R mounted on the seat back B is changed in accordance with the change in the angle. The bracket 28 of the sensor device tilts about the rotation axis X.

At this time, the portion of the bracket 28 pivotally supported around the rotation axis X is operated by the weight of the weight 26.
The original position when the seat back is not tilted is maintained, and the vertical axis VC is always vertical. That is, the bracket 28 rotates about the rotation axis X to maintain the original position.

Next, when the occupant seated on the reclining seat S pulls out the seat belt webbing W and fits and engages the fastener 208 on the buckle device 204 as shown in FIG. 4, the output from the buckle device 204 is obtained. When the operation actuator 200 receiving the signal pulls the rod 202 and pushes the lever member 152 in the direction of the arrow J via the driven bar 162 connected to the tip of the rod 202, the lever member 152
With the help of the urging force, the spring clutch 150 is rotated in the direction of arrow J to return to the vertical position, and the coil portion 150A of the spring clutch 150 is rotated in the direction in which both ends 150B and 150C are wound in the direction of tightening. The inner diameter of the portion 150A is reduced, and the outer peripheral surface of the shaft pin 70 is wound and tightened, so that the shaft pin 70 and the spring clutch 150 are set in a connected state. In this connection state, one end 150B of the spring clutch 150 is connected to the through hole 156 of the hanger 24.
, The spring clutch 150
The bracket 28 having the shaft pin 70 integrally connected to the
The seat back B is fixed at a tilt position corresponding to the tilt state of the seat back B in FIG. In this state, the acceleration sensor device
It works in the same way as a conventional one mounted on a part that is fixedly attached to a vehicle body. That is, when a horizontal acceleration is applied to the acceleration sensor device as shown in FIG. 7, the sensor ball 30 is positioned at the center of the ball receiving portion 60 of the fixed bracket 28. The second pawl 34 is rotated along the driven recess 104 in the direction of arrow F in FIG. Then, the small protrusion 105 of the second pawl 34 contacts the contact surface 118, and the first protrusion 105 integrated with the receiving surface 116 shown in FIG.
The pawl 32 is rotated in the direction of arrow A in FIG.
The second locking claw 112 is engaged with the V gear 138 to lock the locking mechanism 14, thereby stopping the webbing W from being pulled out.

The reclining seat equipped with the acceleration sensor device according to the first embodiment having the above-described structure is provided together with the vehicle body in a tilt angle range of 12 to 27 degrees.
For example, when the sensor ball 30 is tilted to a predetermined tilt angle in a range of 15 degrees to 20 degrees, the sensor ball 30 climbs the ball receiving portion 60 by its own weight, and activates the first and second pawls 32 and 34 to lock the lock mechanism. Since the locking operation of the webbing W is stopped by stopping the webbing 14, the so-called static lock angle can be reduced (sensitively).

In this acceleration sensor device, when the acceleration exerted by the acceleration sensor device stops acting, there is no inertial movement of the occupant, so there is no force to pull out the webbing W, and the engagement between the V gear 138 and the locking claw 112 is released. As a result, each member returns to the normal state due to its own weight.

Further, when the occupant sitting on the reclining seat removes the seat belt webbing, the occupant 208 is removed from the buckle device 204 as described above. The state shifts to the state where the bracket 28 is freely rotatable, and is again in a state suitable for adjusting the reclining of the seat back.

In the above-described first embodiment of the present invention, the operation actuator 200 is not only operated in accordance with the disengagement of the buckle device 204 and the engaging member 208 but also reclined. It may be configured to operate by an output signal corresponding to the operation of the seat reclining operation lever. That is, when the reclining operation lever is not operated, the operation actuator 200 is operated so that the bracket 28 is set to the unrotatable state shown in FIG. When the reclining operation lever is operated, the bracket 28
The operation actuator 200 is operated so as to be set in the rotatable state shown in FIG. In this manner, the bracket 28 can be set to the rotatable state shown in FIG. 5 only when the occupant adjusts the reclining posture and the posture of the bracket 28 needs to be adjusted.

Further, the operation actuator 200 may be connected and configured to be operated by other various operation members or a central control device. (Second Embodiment) Next, a second embodiment of the present invention will be described.
This will be described with reference to FIGS. In the second embodiment, the tension applied to the seat belt webbing W wound around the spool shaft 10 for the pull-out operation is detected, and the lever member 152 is operated to stop and release the bracket 28. It is configured as follows.

For this reason, a tension detecting means of the webbing W is connected to the lever member 152 as a part of the braking means for stopping the rotation of the bracket 28. In order to constitute the tension detecting means, a tension detecting mechanism 210 is mounted on the retractor. The tension detecting mechanism 210 is provided for the webbing W on the retractor base 12.
Of the rocking member 212
And the roller 214 and the interlocking member 21 supported by the
6 is provided.

The swinging member 212 is a substantially elliptical plate-shaped member, and has a corner portion of one of the supporting side surface portions 12A of the retractor base 12 and a corner portion of the other supporting side surface portion (not shown). The pivot member 218 is pivotally connected at the center of the swing member 212 by a shaft pin 218.

Between the pair of swinging members 212, a cylindrical roller 214 is disposed with its both ends pivotally supported by the corresponding swinging members 212. This roller 214
The webbing W wound around the spool shaft 10 is shown in FIG.
When the webbing W is pulled out in the direction of the arrow T, the webbing W presses the roller 214 and moves to rotate the swinging member 212 in the direction of the arrow U.

As shown in FIG. 10, a shaft rod 220 extending toward the side opposite to the roller 214 is provided at an end of the one swing member 212 opposite to the end where the roller 214 is supported. It is protruding. This shaft rod 220 is inserted through a guide groove 222 which is a through hole formed in an arc shape centered on the shaft pin 218 in the shaft supporting side surface portion 12A, and its free end is extended. The free end of the shaft pin 218 is inserted into a shaft hole 224 at one end of the interlocking member 216. The driven bar 162 of the lever member 152 is axially inserted into the shaft hole at the other end of the interlocking member 216, and the swing member 212
The above-described operation is interlocked with the lever member 152 to constitute the above-described tension detecting means. (Operation and Operation of Second Embodiment) Next, the operation and operation of the second embodiment configured as described above will be described. As shown in FIG. 11, when the webbing W of the seat belt is not used, no tension acts on the webbing W, and the tension detection mechanism 210 as the tension detecting means does not operate by the webbing W, and the lever member The state 152 is brought into the normal state shown in FIG. 11 by the urging force of the spring clutch 150.

In the state shown in FIG. 11, the spring clutch 150 is in a state equivalent to that shown in FIG. 4, the spring clutch 150 and the shaft pin 70 are connected, and the bracket 28 is in a state where it cannot rotate.

Next, when the occupant sitting on the reclining seat wears the seat belt webbing W, the webbing W wound on the spool shaft 10 is pulled out, and the tension acting on the webbing W at that time causes The webbing W presses and moves the roller 214 of the tension detecting mechanism 210 to rotate the swinging member 212 in the direction of the arrow U from the state shown in FIG. 11 to the state shown in FIG.
According to this operation, the lever member 152 connected to the swing member 212 by the link of the interlocking member 216 is also elastically deformed so as to rewind the coil portion 150A of the spring clutch 150 from the state of FIG. 11 to the state of FIG. It is in a state of being turned in the direction of arrow G against the urging force. In the state shown in FIG. 12, the spring clutch 150 is in the same state as shown in FIG. 5, and the connection between the spring clutch 150 and the shaft pin 70 is released.
Since the bracket 28 is freely rotatable, the posture of the bracket 28 is changed by the action of the weight 26 so that the virtual vertical axis Vc of the bracket 28 is vertical.

Next, when the occupant sitting on the reclining seat wears the seat belt webbing W or removes it, the pulling force for pulling out the webbing W no longer acts on the webbing W. The force that pushes the roller 214 disappears, and the spring clutch 150
The lever member 152 and the swinging member 212 interlocked with the lever member 152 return from the state shown in FIG. 12 to the state shown in FIG.
Are held with their virtual vertical axis Vc oriented vertically.

Therefore, in the second embodiment,
As shown in FIG. 9, when the occupant seated on the reclining seat first adjusts the tilt of the seat back B, the acceleration sensor device disposed on the seat back B is in a non-rotatable state as shown in FIG. 28 also tilts. Next, by the operation of the occupant pulling out the webbing and mounting the webbing W, the bracket 28 shifts to the freely rotatable state in FIG. 12 due to the tension applied to the webbing W, and the bracket 28 turns its virtual vertical axis Vc in the vertical direction. Is set as follows. Next, when the hanging member completes the work of mounting the webbing W, the tension applied to the webbing W also disappears.
The bracket 28 returns to a non-rotatable state as shown in FIG. 11, and this acceleration sensor device has a so-called static lock angle which is equivalent to that of a conventional device mounted on a portion fixed to a vehicle body. Can be small (sensitive).

The above-mentioned tension detecting means can be a braking means capable of detecting the tension of pulling out the webbing 10 wound around the spool shaft 10 and stopping or releasing the rotation of the bracket 28. Of course, various configurations can be taken. Note that the configuration, operation, and effect of the second embodiment other than those described above are the same as those of the above-described first embodiment, and a detailed description thereof will be omitted. (Third Embodiment) Next, a third embodiment of the present invention will be described.
This will be described with reference to FIGS. The third embodiment detects the rotation direction of the spool shaft 10 and detects the lever member 1.
The bracket 52 is operated to stop and release the bracket 28.

For this reason, the rotation direction detecting means of the spool shaft 10 is connected to the lever member 152 as a part of the braking means for stopping the rotation of the bracket 28. In order to constitute this rotation direction detecting means, the retractor is provided with a large-diameter cylindrical sliding contact shaft portion 226 at a free end portion extending from the shaft supporting side surface portion 12A of the spool shaft 10. A friction spring 228 is fitted on the outer peripheral surface of the sliding contact shaft 226. The friction spring 228 is formed by a friction portion 230 formed by bending a linear spring material into a triangular shape, and a connection end portion 232 formed by bending one end of the friction portion 230 so as to extend. The friction portion 230 is disposed so as to be fitted into the triangular frame so as to press the sliding contact shaft portion 226 in a three-point support state.

The free end of the connection end 232 of the friction spring 228 is bent in a hook shape, and is axially inserted into a shaft hole formed in one end of an interlocking member 234 formed in a long plate shape. . Further, the driven bar 162 of the lever member 152 is axially inserted into a shaft hole drilled at the other end of the interlocking member 234, and the rotation of the friction spring 228 is interlocked with the lever member 152, so that the above-described rotation is performed. Direction detecting means is configured. In order to set the rotation range of the friction spring 228, projecting columns 236 and 238 are provided at two predetermined positions on the inner surface of the upper cover 18, respectively. (Operation and Operation of Third Embodiment) Next, the operation and operation of the third embodiment configured as described above will be described. As shown in FIG. 14, when the webbing W of the seat belt is not used, the webbing W is not pulled out or wound up at all. Contact shaft 226
14 does not operate while the friction spring 228 fitted on the projection 236 is in contact with the projection 236, and the lever member 152 is brought into a normal state shown in FIG.

In the state shown in FIG. 14, the spring clutch 150 is in a state equivalent to that shown in FIG. 4, the spring clutch 150 and the shaft pin 70 are connected, and the bracket 28 is in a state where it cannot rotate.

Next, when the occupant seated on the reclining seat wears the seat belt webbing W, the webbing W initially wound on the spool shaft 10 is used.
When the webbing W is being pulled out, the sliding shaft 226 of the spool shaft 10 rotates in the direction opposite to the arrow K, so that the friction spring 228 keeps the state shown in FIG. Next, in a state where the occupant sitting on the reclining seat has pulled out the webbing W excessively, the buckle device is engaged with the buckle device to attach the seat belt webbing W. Thus, when the operation of mounting the seat belt webbing W is completed, the extra length of the webbing W is wound around the spool shaft 10 so that the webbing W is mounted on the occupant without looseness by the action of the retractor spring. At the time of this webbing W winding operation, the sliding contact shaft 226 is rotated in the direction of arrow K in FIG.
The friction spring 228 pressed against the sliding contact shaft portion 226 with a predetermined frictional force also has a protrusion 2 in the arrow K direction.
28, and the lever member 152 connected to the friction spring 228 via the interlocking member 234 is also elastic so as to rewind the coil portion 150A of the spring clutch 150 from the state of FIG. 14 to the state of FIG. While deforming, arrow G against the urging force
It is in a state of being turned in the direction. In the state shown in FIG. 15, the spring clutch 150 is in a state equivalent to that shown in FIG. 5, the connection between the spring clutch 150 and the shaft pin 70 is released, and the bracket 28 is in a freely rotatable state. Bracket 28 is weight 26
The posture is changed so that the virtual vertical axis Vc of the bracket 28 becomes vertical by the action of (1).

After the webbing W has been wound around the extra length when the occupant is mounted, the webbing W is wound around the spool shaft 10 in the state shown in FIG. Upon completion, the rotation of the sliding contact shaft portion 226 stops, and the urging force of the spring clutch 150 causes the lever member 152 and the friction spring 228 linked therewith to return from the state of FIG. 15 to the state of FIG. Clutch 150
Thus, the bracket 28 is held in a state where the virtual vertical axis Vc is oriented in the vertical direction.

When the occupant removes the webbing W,
When the webbing W is pulled out, the sliding contact shaft 226 rotates in the direction opposite to the arrow K to be in the state shown in FIG. 14, and when the webbing W is involved, the sliding contact shaft 226 rotates in the direction of the arrow K and FIG. 14 and the state shown in FIG. 14 is obtained by the urging force of the spring clutch 150 upon completion of the winding of the webbing W. However, this operation does not affect the sensitivity of the acceleration sensor device and does not cause any problem.

For this reason, in the third embodiment,
As shown in FIG. 9, when the occupant sitting on the reclining seat adjusts the tilt of the seat back B and then wears the seat belt webbing W, the bracket during the extra-long portion of the webbing W during this mounting operation is engaged. 2
15 is shifted to the freely rotatable state in FIG. 15, the bracket 28 is set so that its virtual vertical axis Vc is oriented in the vertical direction. In this state, the so-called static lock angle of the acceleration sensor device can be made small (sensitive), as in the case where the acceleration sensor device is mounted on a portion which is fixed to the conventional vehicle body. The above-described rotation direction detecting means detects the rotation direction of the spool shaft 10 and
Needless to say, various configurations can be adopted as long as a braking means capable of stopping or releasing the rotation of the brake 8 can be configured.

The configuration, operation, and effects of the third embodiment other than those described above are the same as those of the first embodiment, and thus detailed description thereof will be omitted. Further, the configuration of the present invention is not limited to the above-described first, second, and third embodiments, and FIGS.
Bracket 5 in the conventional acceleration sensor device shown in FIG.
A braking mechanism for stopping the rotation of the intermediate member 510 with respect to 12; and further, the braking mechanism is operated corresponding to various operating members such as levers and buckles, or the occupant wears the webbing. To be operated by the control device based on the detection of, for example, the webbing tension detecting means or the spool shaft rotation direction detecting means, or operating at a required timing. The control means may be configured at the same time. At the same time, after the position where the acceleration sensor device is disposed changes its attitude with respect to the vehicle body, the swing operation of the bracket 28 is stopped, or the bracket 28 waits until it is sufficiently attenuated. May be configured to perform the operation of stopping the operation. In this case, for example, the operation actuator 200 may be delayed by an operation control circuit having a delay circuit, a central control device having a delay program, or the like. In addition, not only an acceleration sensor device using the sensor ball 30, but also an inertial body having various configurations such as a pendulum type and a falling type can be used. At the same time, the configuration of the present invention can of course be used for an acceleration sensor device of various other configurations that is used by being attached to a portion of this type of vehicle body whose angle is changed.

[0072]

According to the acceleration sensor device of the present invention, the posture can be changed with respect to the vehicle body, and the sensitivity when the entire vehicle body is tilted is made sensitive, so that the so-called static lock angle can be reduced. Having.

[Brief description of the drawings]

FIG. 1 is a side view partially showing a main part of a webbing take-up device to which a vehicle acceleration sensor device according to a first embodiment of the present invention is attached.

FIG. 2 is an exploded perspective view showing a main part of the webbing take-up device to which the vehicle acceleration sensor device, a part of which is shown in FIG. 1, is attached.

FIG. 3 is an exploded perspective view showing an enlarged portion of the vehicle acceleration sensor device of FIG. 2;

FIG. 4 is a schematic explanatory view showing a main part of the acceleration sensor device for a vehicle according to the first embodiment of the present invention in a state where the bracket is fixed.

FIG. 5 is an explanatory diagram for explaining an operation state of a main part in a bracket rotation free state of the vehicle acceleration sensor device according to the first embodiment of the present invention.

FIG. 6 is a partial cross-sectional front view corresponding to a partially enlarged view of FIG. 1 showing a vehicle acceleration sensor device according to the first embodiment of the present invention.

7 is a vertical sectional view of the vehicle acceleration sensor device according to the first embodiment of the present invention, taken along line VII-VII of FIG.

8 is a longitudinal sectional view of the vehicle acceleration sensor device according to the first embodiment of the present invention, taken along line VIII-VIII of FIG.

FIG. 9 is a schematic side view illustrating a vehicle seat equipped with a webbing take-up device provided with the vehicle acceleration sensor device according to the first embodiment of the present invention.

FIG. 10 is an exploded perspective view showing a main part of a webbing take-up device to which a vehicle acceleration sensor device according to a second embodiment of the present invention is attached.

FIG. 11 is a schematic explanatory view showing a main part of a vehicle acceleration sensor device according to a second embodiment of the present invention in a state where a bracket is fixed.

FIG. 12 is an explanatory diagram for explaining an operation state of a main part in a bracket rotation free state of the vehicle acceleration sensor device according to the second embodiment of the present invention.

FIG. 13 is an exploded perspective view showing a main part of a webbing take-up device to which a vehicle acceleration sensor device according to a third embodiment of the present invention is attached.

FIG. 14 is a schematic explanatory view showing a main part of a vehicle acceleration sensor device according to a third embodiment of the present invention in a state where a bracket is fixed.

FIG. 15 is an explanatory diagram for explaining an operation state of a main part in a bracket rotation free state of the vehicle acceleration sensor device according to the third embodiment of the present invention.

FIG. 16 is a partial cross-sectional view showing a main part of a retractor provided with a conventional vehicle acceleration sensor device.

FIG. 17 is a partial longitudinal sectional view showing a main part of a retractor provided with a conventional vehicle acceleration sensor device.

[Explanation of symbols]

14 Lock Mechanism 16 Acceleration Sensor Main Body 22 Sensor Cover (Housing) 24 Hanger (Housing) 26 Weight 28 Bracket 30 Sensor Ball (Inertial Body) 32 First Paul 34 Second Paul 60 Ball Receiver 70 Shaft Pin 74 Bearing Hole 76 Shaft Pin 78 Bearing part 102 Shaft pin part 104 Depressed recess for driving 110 Bearing hole 138 V gear 150 Spring clutch 152 Lever member (braking means) 162 Follower bar (braking means) 200 Operation actuator (braking means) 202 Rod (braking means) 204 Buckle device (braking means) 208 Tether (braking means) 210 Tension detecting mechanism (tension detecting means) (control means) 212 Swing member (tension detecting means) (control means) 214 Roller (tension detecting means) (control means) ) 216 Interlocking member (tension detection Means (Control means) 218 Shaft pin (Tension detecting means) (Control means) 226 Sliding contact shaft part (Rotation direction detecting means) (Control means) 228 Friction spring (Rotation direction detecting means) (Control means) 234 Interlocking member ( Rotation direction detection means) (control means)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Ume ▲ Sawa ▼ Yoshio Noda, Toyota-ji, Oguchi-cho, Niwa-gun, Aichi Prefecture Inside Tokai Rika Electric Works, Ltd. No. 1 Toyoda No. 1 in Tokai Rika Electric Works, Ltd.

Claims (4)

[Claims] 1. A vehicle acceleration sensor device for driving an output member by inertial movement of an inertial body according to acceleration applied to a vehicle, comprising: a housing fixed to a vehicle body; and a rotation axis of the housing. A bracket rotatably supported around the bracket, and the bracket is pivoted about the axis of rotation by its own weight even when the mounting angle of the housing to the vehicle body is changed, so that the axis of rotation of the bracket is A weight provided on the bracket so as to take a constant posture around the bracket, and braking means for stopping the rotation of the bracket relative to the housing or releasing the bracket freely. Vehicle acceleration sensor device. 2. A vehicle acceleration sensor device for driving an output member by inertially moving an inertial body according to acceleration applied to a vehicle, comprising: a housing fixed to a vehicle body; and a rotation axis of the housing. A bracket rotatably supported around the bracket, and the bracket is pivoted about the axis of rotation by its own weight even when the mounting angle of the housing to the vehicle body is changed, so that the axis of rotation of the bracket is A weight provided on the bracket so as to take a fixed posture around the bracket, and when a fastening device is engaged with the buckle device in the seat belt device, the rotation of the bracket with respect to the housing is stopped. Braking means for freely releasing the bracket when the attachment is detached from the buckle device. Dual acceleration sensor device. 3. An acceleration sensor device for a vehicle for driving an output member by inertial movement of an inertial body according to acceleration applied to a vehicle, comprising: a housing fixed to a vehicle body; and a rotation axis of the housing. A bracket rotatably supported around the bracket, and the bracket is pivoted about the axis of rotation by its own weight even when the mounting angle of the housing to the vehicle body is changed, so that the axis of rotation of the bracket is A weight provided on the bracket so as to take a constant posture around, and a turning operation of the bracket with respect to the housing,
Braking means for stopping when no tension is applied to pull out the webbing in the retractor and for releasing the bracket to freely rotate when detecting the tension when pulling out the webbing, a vehicle acceleration sensor comprising: apparatus. 4. A vehicle acceleration sensor device for driving an output member by inertially moving an inertial body according to acceleration applied to a vehicle, comprising: a housing fixed to a vehicle body; and a rotation axis of the housing. A bracket rotatably supported around the bracket, and the bracket is pivoted about the axis of rotation by its own weight even when the mounting angle of the housing to the vehicle body is changed, so that the axis of rotation of the bracket is A weight provided on the bracket so as to take a constant posture around, and a turning operation of the bracket with respect to the housing,
Braking means for stopping when the spool shaft in the retractor is rotating or stopping in the webbing pull-out direction, and for freely releasing the bracket when rotating in the webbing winding direction. A vehicular acceleration sensor device.