JPH10246733A - Acceleration sensor device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the sensitivity when a vehicle body is inclined by a method wherein, at the time of making free or stopping the inclination of a seat back of a reclining seat, a bracket is made pivotable or unpivotable with respect to a housing. SOLUTION: While an unlock lever 202 stops a seat back inclination, a lever member 152 is pivoted to a stop position of a shaft pin 70 by a connection wire 200, and an end part 150C of a spring clutch 150 is pivotal to a direction I and is fixed with respect to the shaft pin 70, and the bracket is held integral with a hanger 24. If the unlock lever 202 is pivoted to a direction G for the seat back inclination, the connection wire 200 us fed to a side of the level member 152, and the level member 152 is pivoted to a reverse direction of I by an urging force of the spring clutch 150, and the shaft pin 70 is pivotable. The bracket is tilted in accordance with regulation of an inclination angle of the seat back, a weight 26 is pivoted to keep an original position. Thereby, even when the entire vehicle body is inclined, it can be operated with susceptive sensitivity.

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 for detecting a large acceleration exceeding a predetermined value applied to the vehicle to prevent the webbing from being pulled out from the retractor of the seat belt device. The sensor device is mounted.

[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.
And an impact sensing device as shown in FIG.
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
13, 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. 13 and 14, which can be attached to the vehicle body, the reclining seat to which the impact sensing device is attached 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 a seat back of the reclining seat, a bracket rotatably supported around a rotation axis of the housing, and a mounting angle of the seat back to a vehicle body is changed. A weight provided on the bracket so as to rotate the bracket around the axis of rotation by its own weight to cause the inertial body to take a constant posture around the axis of rotation, and a seat back of a reclining seat. When the seat back is tilted freely by an unlock lever provided for tilt adjustment, the front of the housing is Releasing the bracket pivot freely, and having a braking means for arresting rotation of the bracket relative to the housing the lock release lever when operating the seat back tilting stop.

With the above-described structure, the occupant is seated on, for example, a reclining seat provided with the vehicle acceleration sensor device, and the unlocking lever is provided so that the seat back can be freely tilted for the reclining operation of the seat back. Is operated, the braking means of the vehicle acceleration sensor device opens the bracket freely in conjunction with the operation. When the seat back is tilted in this state, the bracket rotates to a fixed posture in which an appropriate acceleration can be detected in accordance with the inclination of the seat back by the action of the weight. further,
When the reclining operation of the seat back is completed and the unlocking lever is operated so as to stop the tilt of the seat back, the braking means stops the turning operation of the bracket with respect to the housing, and the bracket responds to the inclination of the seat back. It is fixed in position and operates with a sensitive sensitivity (so as to reduce the so-called static lock angle) when the entire vehicle body is tilted at a predetermined small angle.

According to a second 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, wherein the reclining seat has a seat. A housing fixed to the back, a bracket rotatably supported around the axis of rotation of the housing, and the bracket being rotated by its own weight even if the seat back is mounted at a different angle from the vehicle body. A weight provided on the bracket and a seat back of the reclining seat are provided for tilting adjustment of a weight provided on the bracket so as to rotate the inertial body around the rotation axis and to take a constant posture about the rotation axis. The bracket is rotated with respect to the housing when the seat back is tilted freely by the lock release lever. Braking means for releasing the lock release lever and immediately after the operation of the seatback tilt restraint operation is completed, and after allowing a time to attenuate the swing of the bracket, stopping the rotation of the bracket relative to the housing; It is characterized by having.

With the above-described structure, the occupant is seated on, for example, a reclining seat provided with the vehicle acceleration sensor device, and the unlocking lever is provided so that the seat back can be freely tilted for the reclining operation of the seat back. Is operated, the braking means of the vehicle acceleration sensor device opens the bracket freely in conjunction with the operation. When the seat back is tilted in this state, the bracket rotates to a fixed posture in which an appropriate acceleration can be detected in accordance with the inclination of the seat back by the action of the weight. further,
When the reclining operation of the seat back is completed and the unlock lever is operated so as to stop the tilting of the seat back, the braking means waits for a predetermined time so that the swinging motion of the bracket due to the tilting motion of the seat back is attenuated and calmed down. After that, the rotation of the bracket with respect to the housing is stopped, and the bracket is fixed at a position appropriately corresponding to the inclination of the seat back. (To reduce the static lock angle).

[0012]

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 provided 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 provided integrally, 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 thus configured 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 lateral sides of the rectangular small plate, and bearing holes 74 are coaxially formed at the free ends of the support columns 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.

The 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 attached to 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 constructed as described above 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

An outwardly projecting step portion 96 is formed at an intermediate position between the outer side surfaces of the respective column-shaped portions in the counterweight portion 90, and the weight 26 integrated with the bracket 28 is rotated. 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 has a shaft pin 102, which is the center of rotation, inserted in the bearing hole 74, and is formed in a truncated conical recess on the lower surface of its head 98 as shown in FIG. 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 projecting protruding stopping portion 106, and the stopping protruding portion 106 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 such that one end of the beam-shaped portion 108 arranged in the lateral direction is raised at a right angle so that the entire shape has 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 formed in an arc surface centered on the rotation axis X in order to bend so as to protrude in the extending direction of the locking claw portion 112 so that the small protrusion portion 105 comes into sliding contact. Provided 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.

Also, 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 supports 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 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 portion of the acceleration sensor main 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 web gear W is pulled out by a small amount while the rotation of the V gear 138 in the direction indicated by the arrow E is stopped by the first pawl 32, the spool shaft 10 is pulled out by a small amount. Rotate in the direction. 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, the 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 interlocking wire 200. Have.

The spring clutch 150 is a torsion coil spring.
The coil portion 150A is loosely inserted into the shaft pin 70 in a state where no load is applied to the spring clutch 150, and the shaft pin 70 is configured to be freely rotatable. Coil part 150A
The shaft pin 70 is wound so as to be tightened by an additional load for winding the shaft, and both are held so as not to rotate relatively. Further, the spring clutch 150
Is one end 1 extending from the coil portion 150A.
50B is inserted and engaged with a through hole 156 formed at a predetermined position on the front plate 48, and the other end 150C is inserted and engaged with a through hole 158 formed on the lever member 152. .

The lever member 152 is a substantially elliptical small plate member, and at one end thereof is provided a shaft cylinder portion 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 engage with and be interlocked with the free end of the interlocking wire 200.

As shown in FIGS. 4 and 5, one end of the interlocking wire 200 is formed in a ring shape, and a driven bar 162 is axially inserted in a hole of the ring.

The other end of the interlocking wire 200 is connected to the reclining seat S to which the acceleration sensor device is attached.
9 is connected to a lock release lever 202 of a lock mechanism (not shown) that locks the seat back B (shown in FIG. 9) to prevent the tilting operation. The lock release lever 202 has its base end fixed to the lock mechanism operating rod 204.
By rotating the lock mechanism operation rod 204 in the direction of arrow G by rotating in the direction of arrow G up to the state shown in FIG. 5, the lock mechanism is unlocked. A grip portion 206 is provided at a free end of the lock release lever 202, and an engagement hole 208 is provided at an intermediate portion thereof. The other end of the interlocking wire 200 is engaged with the engagement hole 208. ing. (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 state shown in FIG. 4 in which the lock release lever 202 shown in FIG. 4 is not operated (a state in which the lock mechanism restricts the seat back B (shown in FIG. 9) from tilting), the interlocking wire 200 is used. The locked state is such that the lever member 152 is rotated to the locked position of the shaft pin 70. In this restrained state, the lever member 152 pushes the end 150C of the spring clutch 150 locked thereto against the urging force of the spring clutch 150, as indicated by the arrow I in the drawing.
By rotating in the direction, the coil portion 150A
Of the spring clutch 15 by tightening while being wound around the shaft pin 70 so as to reduce the inner diameter of the spring clutch 15.
0 and the shaft pin 70 are held so as not to rotate relatively. Further, at this time, the spring clutch 150 is in an immobile state because one end portion 150B thereof is inserted and locked in the through hole 156 of the hanger 24, so that the bracket 28 having the shaft pin 70 is integrally formed with the hanger 24. It is kept immobile. In this state, the acceleration sensor device operates in the same manner as a conventional one mounted on a portion which is fixedly attached to a vehicle body. That is, FIG.
When a horizontal acceleration is applied to the acceleration sensor device as shown in FIG. 7, the sensor ball 30 is located on the center of the ball receiving portion 60 of the fixed bracket 28, , The second pawl 34 is rotated 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 pawl 32 integrated with the receiving surface 116 shown in FIG. 8 is rotated in the direction of arrow A in FIG. The locking claw 112 is engaged with the V gear 138 to lock the lock mechanism 14, thereby stopping the webbing W from being pulled out.

Further, the reclining seat equipped with the acceleration sensor device of 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 does not work, there is no inertial movement of the occupant. As a result, each member returns to the normal state due to its own weight.

Next, when the occupant seated on the reclining seat S rotates the lock release lever 202 in the direction of arrow G from the state shown in FIG. 4 to the state shown in FIG. The wire 200 is sent out to the lever member 152 side. Then, the biasing force of the spring clutch 150 causes the lever member 152 to rotate in the direction opposite to the arrow I, and the coil portion 150A of the spring clutch 150 is moved in a direction in which both ends 150B and 150C are unwound, and this coil Part 150A
Of the shaft pin 70, a clearance H is formed between the shaft pin 70 and the outer peripheral surface thereof.
Is set in a disengaged state in which it is freely rotated with respect to. In this state, as illustrated in FIG. 9, when the tilt angle of the seat back B of the reclining seat S mounted in the vehicle is adjusted in the arrow Y direction from the position indicated by the solid line to the position indicated by the imaginary line in the drawing. 1 and 6, the bracket 28 of the acceleration sensor device of the retractor R attached to the seat back B tilts about the rotation axis X in accordance with the angle change.

At this time, the portion of the bracket 28 pivotally supported around the rotation axis X is caused by the weight of the weight 26.
The original position when the seat back B 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 sitting on the reclining seat S adjusts the tilting position of the seat back B, and turns the unlock lever 202 from the position shown in FIG. 5 to the position shown in FIG. Interlocking wire 2 as described above
The lever member 152 shifts to a state in which the shaft pin 70 is stopped by the spring clutch 150 via 00.
Thus, in the state after the tilt adjustment of the seat back B, the bracket 28 is fixed while maintaining the position where the vertical axis VC is vertical. (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, when the lock release lever 202 is moved from the tiltable position of the seat back B to the position where the lock mechanism is locked to prevent the seat back B from tilting, the bracket 28 is moved. A delay means is provided for delaying the transition from the suspension release state to the suspension state.
That is, the lock release lever 202 and the lever member 15
2 are connected via delay means.

The lock release lever 202 has its middle portion pivotally supported by a fixed member (not shown) by a shaft pin 210, and a grip portion 206 is provided at one end thereof. Further, the shaft pin 210 of the unlock lever 202
A tension spring 214 whose one end is supported by the fixed structure portion 212 is stretched between the grip portion 206 and the grip portion 206, and an arrow is set so that the lock release lever 202 returns to the lock operation position shown in FIGS. It is urged in the L direction. Further, one end of a connection member 216 is pivotally mounted on a shaft pin 217 at an end of the lock release lever 202 opposite to the grip 206. This connection member 216 is a rod-shaped member,
The other end is provided with an operating section 218 formed by integrating short rods into a T-shape.

The operation section 218 of the connection member 216 is connected to the damper lever 220. The damper lever 220 is a substantially elliptical disk-shaped lever member, and the base end of the damper lever 220 is provided by a damper pivot support 222.
Is mounted so as to rotate slowly. The damper pivot 222 is composed of a generally used oil damper or the like. For example, a highly viscous grease is filled between a pair of rotating plates disposed in close proximity to each other, and the pair of rotating When the plate performs a relative rotation operation, a plate configured to generate a predetermined high resistance can be used.

In the vicinity of the damper pivot 222 of the damper lever 220, the other end of a tension spring 226 having one end fixed to the fixed structure 224 is fixed.
Is rotated so as to rotate a predetermined angle in the direction of arrow J in the figure.

Two interlocking pins 228 protrude from the side of the damper lever 220 at an intermediate position. The interval between the two interlocking pins 228 is formed shorter than the short rod of the operation unit 218, and the two interlocking pins 228 are formed.
The operation section 218 of the connection member 216 passed through the space between the two interlocking pins 228 and the damper lever 220
Can be rotated in the direction opposite to the arrow J.

Further, the damper lever 220 is connected to the tension spring 22.
6, the lock release lever 20 connected via the connecting member 216 against the force to rotate in the direction of arrow J.
2 in the direction of arrow L overcomes the force of the tension spring 214, and the damper lever 220 and the lock release lever 2
02 is in the normal state shown in FIG.
And the tension of the tension spring 226 are set.

The damper lever 220 has one end 2
The intermediate portion of 20 </ b> A is arranged at a position where it comes into contact with a rod-shaped driven bar 162 protruding from the tip of the lever member 152.

As described above with reference to FIG. 3, the lever member 152 is connected to the through hole 158 of the lever member 152 and the through hole 156 of the hanger 24 by the spring clutch 150 having the ends 150B and 150C engaged. Figure 10
It is urged to rotate in the direction of arrow K in FIG.

In the spring clutch 150, the shaft pin 70 is inserted through the coil portion 150A, and the lever member 15
When 2 is in the state shown in FIGS. 11 and 12, the shaft pin 70 is loosely inserted in the coil portion 150A, and both are relatively free to rotate. At the same time, when the lever member 152 changes from the state shown in FIG. 11 to the state shown in FIG. 10 in which the lever member 152 is rotated in the direction opposite to the arrow K, the coil portion 150A is retracted and wound around the shaft pin 70 and tightened. It is set to be in a state where it cannot be rotated.

The urging force of the spring clutch 150 is controlled by the urging force of the tension spring 226.
0 is rotated in the direction of arrow J, and one side end 220A is set so as to push the driven bar 162 to rotate the lever member 152 in the direction of arrow K. (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. 10, in a normal state in which the seat back B of the reclining seat is restrained from tilting, a lock for stopping the tilting operation of the seat back B in which the lock release lever 202 has been rotated in the arrow L direction is completed. It is in a position for locking the mechanism (a position for stopping the seat back B from tilting). In this normal state,
The connection member 216 is moved in the direction of arrow M, and the damper lever 220 is moved by the urging force of the tension spring 226 to the position indicated by arrow J.
The link pin 228 is in contact with the operation unit 218 and is stopped. At the same time, in the normal state, the one side edge 220A of the damper lever 220 comes into contact with the driven bar 162, and the lever member 152 is rotated in the direction opposite to the arrow K to pivot the coil portion 150A of the spring clutch 150. The shaft pin 70 is prevented from rotating by being wound around the pin 76. Therefore, the bracket 28 part integral with the shaft pin 70 is also restrained.

Next, when the occupant sitting on the reclining seat rotates the lock release lever 202 in order to adjust the tilt of the seat back B, the state shifts to the reclining adjustment state shown in FIG. That is, the lock release lever 2
02 in the direction opposite to the arrow L, the connecting member 21
6 is pulled in the direction opposite to the arrow M, and the damper lever 220 in which the interlocking pin 228 is in contact with the operation portion 218 is turned in the direction opposite to the arrow J against the urging force of the tension spring 226. Then, while the driven bar 162 slides on the one side edge 220A in accordance with the rotation of the damper lever 220, the lever member 152 rotates in the direction of arrow K by the biasing force of the spring clutch 150 by itself. At this time, since the spring clutch 150 can relax its elastic deformation,
The winding of the coil portion 150A is loosened, and the coil portion 15A
The inner diameter of 0A is enlarged, and a gap H is formed between the shaft pin 70 and the spring clutch 150 and the shaft pin 70 are in a released state in which they are relatively free to rotate.

Further, when the lock release lever 202 is rotated in the direction opposite to the arrow L, the lock mechanism (not shown) of the reclining seat is released, and the tilt of the seat back B can be adjusted. For example, as shown in FIG. Then, the seat back B is tilted from the solid line position to the broken line position. Then, the lock release lever 202 is rotated in the direction of arrow L from the state of FIG. 11 to the state of FIG. 12 at the desired tilting position of the seat back B. As a result, the locking mechanism of the reclining seat is locked, and the seat back B is fixed at the desired tilt position. During the operation of tilting and adjusting the seat back B, the bracket 28 of the acceleration sensor main body 16 includes the spring clutch 150 and the shaft pin 7.
0 is released and the bracket 28 is free to rotate.
Attempt to change the posture so that the virtual vertical axis VC of No. 8 is vertical. However, if the operation of inclining the seat back B is performed early, the bracket 28 swings, and the swinging operation is attenuated, and it may take a little time to stop. In such a case, after the tilt adjustment of the seat back B, the spring clutch 15
Since the virtual vertical axis VC of the bracket 28 may not be oriented in the vertical direction when the shaft pin 70 and the shaft pin 70 are connected, the spring clutch 150 and the shaft pin 70 are connected after the swing operation of the bracket 28 is stopped. Is desirable.

For this reason, in the second embodiment, when the lock release lever 202 shown in FIG. 12 is set to the lock operation position for preventing the seat back from tilting, the spring clutch 150 and the shaft pin are immediately 70 is operated so as not to be coupled. That is, by rotating the lock release lever 202 in the direction of the arrow L, the connecting member 216 moves in the direction of the arrow M, and the state in which the operation unit 218 presses the interlocking pin 228 is released.

Then, a turning force in the direction of arrow J is applied to the damper lever 220 by the tension spring 226, but the damper lever 220 is operated by the damper pivot 222.
Is slowly performed in the arrow J direction. Therefore, from the state of FIG. 12, the damper lever 220 rotates in the direction of arrow J, rotates the lever member 152 in the direction opposite to the direction of arrow K, and connects the spring clutch 150 and the shaft pin 70 as shown in FIG. In the meantime, bracket 28
Is in a state where the swinging operation is stopped and the virtual vertical axis VC is oriented in the vertical direction. That is, the bracket 28
Is stopped by the connection between the spring clutch 150 and the shaft pin 70 in a state where the virtual vertical axis VC is oriented in the vertical direction, and the position is maintained. 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 configuration, operation, and effects 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. The configuration of the present invention uses not only the acceleration sensor device using the sensor ball 30 shown in the first and second embodiments described above, but also an inertial body having various configurations such as a pendulum type and a falling type. Can be. 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.

[0062]

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 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. 11 is an explanatory diagram illustrating 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. 12 is an explanatory diagram for explaining an operation state of a main part when the vehicle acceleration sensor device according to the second embodiment shifts from a bracket rotation free state to a fixed state.

FIG. 13 is a partial sectional view showing a main part of a retractor provided with a conventional vehicle acceleration sensor device.

FIG. 14 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 Driven recess 110 Bearing hole 138 V gear 150 Spring clutch 152 Lever member (braking means) 162 Follower bar (braking means) 200 Interlocking wire 202 Lock release lever 204 Lock mechanism operating rod 210 Shaft Pin 214 Tension spring 216 Connection member 217 Shaft pin 218 Operation part 220 Damper lever 220A One side edge 222 Damper pivot 226 Tension spring 228 Interlocking pin

Claims (2)

[Claims] 1. 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 seat back of a reclining seat; A bracket rotatably supported around a rotation axis; and an inertia body configured to rotate the bracket about the rotation axis by its own weight even if the seat back is attached to a vehicle body at a changed angle. A weight provided on the bracket so as to take a fixed posture around the rotation axis, and a tilting of the seat back at a lock release lever provided to tilt and adjust the seat back of the reclining seat. The bracket is pivotally released relative to the housing and the lock release lever is moved forward. The vehicle acceleration sensor device, characterized in that it comprises a braking means for arresting rotation of said bracket with respect to the housing during operation of the seat back tilting stop, the. 2. An acceleration sensor device for a vehicle that drives an output member by inertially moving an inertial body in accordance with acceleration applied to a vehicle, comprising: a housing fixed to a seat back of a reclining seat; A bracket rotatably supported around a rotation axis; and an inertia body configured to rotate the bracket about the rotation axis by its own weight even if the seat back is attached to a vehicle body at a changed angle. A weight provided on the bracket so as to take a fixed posture around the rotation axis, and a tilting of the seat back at a lock release lever provided to tilt and adjust the seat back of the reclining seat. The bracket is pivotally released relative to the housing and the lock release lever is moved forward. A vehicle acceleration sensor, comprising: braking means for stopping rotation of the bracket with respect to the housing after a time period for attenuating the swing of the bracket immediately after the operation of restraining the seat back tilt is completed. apparatus.