JPH10175511A - Acceleration sensor device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform proper operation by detecting acceleration exerted on a vehicle body even when a posture mounted on a vehicle is varied. SOLUTION: By integrally mounting a weight 26 on an acceleration sensor body rotatably supported at a fixing member on the car body side or a member part, such as the bracket 28 of the acceleration sensor body arranged in a manner to move a sensor ball 30, the acceleration sensor body or the member part, such as the bracket 28, is rotated to assume a constant posture in a vertical direction even when the mounting angle is varied for a fixing member on the car body side with a car body. Further, when acceleration is applied in a horizontal direction, rotation operation of the acceleration sensor body or the member part, such as the bracket 28, is stopped by brake holding means more rapidly than movement operation of the sensor ball 30 and the acceleration sensor device for a vehicle is properly operated with constant acceleration in a horizontal direction.

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.

However, when this acceleration sensor is mounted on a portion of the reclining seat, such as a seatback retractor, whose angle is changed with respect to the vehicle body, the mounting posture of the acceleration sensor device of this retractor is changed by adjusting the seating posture. Is changed, and an acceleration different from the set acceleration to be detected by the acceleration sensor device is detected.

[0005]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention takes into account the fact that even if the attitude of the vehicle is changed,
It is an object of the present invention to provide an acceleration sensor device capable of appropriately detecting acceleration acting on a vehicle body.

[0006]

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 in accordance with acceleration applied to a vehicle. An acceleration sensor main body rotatably supported by a member on the vehicle body side, or at least a member portion such as a bracket movably provided with an inertial body of the acceleration sensor main body, and the acceleration sensor main body side or a bracket or the like. It is arranged integrally with the member part, and even if the member on the vehicle body side is changed in the mounting angle to the vehicle body, the member part such as the acceleration sensor main body or the bracket is rotated by its own weight to maintain a constant posture in the vertical direction. When a horizontal acceleration is applied to a weight provided so as to be taken, the horizontal acceleration is detected, and the acceleration is faster than the movement of the inertial body. Sa body, or is characterized by having a braking holding means for stopping the rotation of member portions such as the bracket.

With the above-described structure, when acceleration having a horizontal component is applied to the vehicle acceleration sensor device, the brake holding means operates quickly to rotate the acceleration sensor body or the bracket. Since the moving member is braked so as to take a constant posture in the vertical direction, the inertial body can perform a predetermined moving operation at a constant acceleration. It should be noted that the weight may be configured to be able to take a constant posture in the vertical direction by rotating a member portion such as the bracket, even if the weight is integrally formed with the bracket.

According to a second aspect of the present invention, there is provided a vehicle acceleration sensor device for driving an output member by inertially moving an inertial body in accordance with an acceleration applied to a vehicle, wherein the vehicle acceleration sensor device is fixed to a vehicle body. Housing, a bracket rotatably supported about the axis of rotation of the housing, and the bracket being rotated about the axis of rotation by its own weight even when the mounting angle of the housing to the vehicle body is changed. A weight provided on the bracket so as to move the inertia body so as to take a constant posture with respect to the vertical direction; To stop
And a brake holding unit including a brake sensor and an engagement stopping portion disposed between the bracket and the housing.

With the above-described structure, when an acceleration having a horizontal component is applied to the vehicle acceleration sensor device, the acceleration sensor of the brake holding means detects the acceleration, and the brake holding device detects the acceleration. Since the bracket is braked so as to maintain a constant posture in the vertical direction by engagement with the engagement stopping portion as a means, the inertial body performs a predetermined moving operation at a constant acceleration, and this vehicle acceleration sensor device is It can work properly.

According to a third aspect of the present invention, there is provided a vehicle acceleration sensor device for driving an output member by inertially moving an inertial body in accordance with acceleration applied to a vehicle. On the other hand, the rotating body which is freely rotatably supported, and the rotating body is rotated by its own weight even if the mounting angle of the rotating body to the vehicle body is changed so that the rotating body takes a constant posture in the vertical direction. A weight provided on a rotating body side, an acceleration sensor body fixed to the rotating body, and a movement operation when the inertial body receives a horizontal acceleration to stop the rotation movement of the rotating body; And a brake holding means provided with a braking sensor and an engagement restraining portion for restraining engagement provided between the rotating body and the fixed portion on the vehicle body side. .

With the above-described structure, when an acceleration having a horizontal component is applied to the vehicle acceleration sensor device, the acceleration sensor of the brake holding means detects the acceleration, and the brake holding device detects the acceleration. Since the rotating body on which the acceleration sensor main body is arranged is braked so as to maintain a constant posture in the vertical direction by engagement with the engagement stopping portion as a means,
The inertial body performs a predetermined moving operation at a constant acceleration, so that the vehicle acceleration sensor device can operate properly.
Furthermore, when a rotating body is used, conventional acceleration sensor device bodies having various configurations can be used as they are.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 7 show a first embodiment in which a vehicle acceleration sensor device according to the present invention is configured as an acceleration sensor of a retractor used for a seat belt device.

As shown in FIGS. 1 and 2, a retractor base 1 for supporting both ends of a shaft 10 of a spool around which a seat belt webbing W (shown in FIG. 10) is wound.
2 is provided with a lock mechanism 14
And the acceleration sensor body 16 is mounted. further,
As shown in FIG. 2, an upper cover 1 for accommodating a lock mechanism 14 and an acceleration sensor body 16
8 is attached.

As shown in FIG. 2 and FIG. 3, the acceleration sensor main body 16 is
A is attached to a substantially elliptical opening 20 formed in A. As shown in FIG. 1 to FIG.
Is configured such that a weight portion 26, a bracket 28, a sensor ball 30, which is an inertial body, a first pawl 32, and a second pawl 34 are mounted in a housing composed of a sensor cover 22 and a hanger 24. .

The sensor cover 22 has a cylindrical peripheral wall 38 erected at a right angle from the periphery of a 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 portion 40 extending outward is integrally provided.

As shown in FIG. 3, the respective portions of the flange portion 40 of the sensor cover 22 that are directly adjacent to FIG. 3 are cut out over a small range to form the cut-out portions 4.
2 are formed, and each notch 42 is integrally provided with an engaging projection 44 extending from the peripheral wall 38 in a rectangular tongue shape. At the free end of each engagement piece 44,
A mooring portion 46 having a slope formed so as to be tapered in a hook shape protruding outward is formed.

The hanger 24 assembled to the sensor cover 22 is integrally formed with a semi-cylindrical peripheral side wall 50 so as to extend in a direction perpendicular to the arc-shaped peripheral end of the front semi-circular front plate portion 48. By doing so, the inside of the bracket 2
8 are formed. An opening 51 is formed in a lower part of the peripheral side wall 50 so as to extend a part of the weight 26 out of the housing. Further, a small semicircular bearing plate portion 48A is provided at the center of each oblique side portion 48B extending in the radial direction of the front plate portion 48 and forming an obtuse angle.
Are protruded 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 constructed as described above is shown in FIG.
As can be seen from the figure, the free end of the peripheral side wall 50 is brought into contact with the flange portion 40 of the sensor cover 22, and the mooring portion 46 of the engaging projection piece 44 is locked to the locking portion 58, whereby the sensor cover 22 is integrated And the acceleration sensor body 1
6.

A bracket 28 supported inside a housing constituted by the sensor cover 22 and the hanger 24.
Is made of a synthetic resin, and is positioned on both ends in the diameter direction of a base 62 having a ball receiving portion 60 which is a generally mortar-shaped concave portion, facing the side where the ball receiving portion 60 is located (upward in FIG. 3). The extending support plate 64 and the 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, on the opposite side of the rectangular small plate from the ball receiving portion 60. Is provided integrally with a small cylindrical shaft pin 70 at the center of the outer surface.

The support support plate 66 has a column 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 column 72. A small cylindrical shaft pin 76 (FIG. 4) is integrally protruded from the center of the outer surface opposite to the ball receiving portion 60 of the rectangular small plate.

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.

The one shaft pin 70 is rotatably supported by the shaft hole 52 of the hanger 24. Also, the other shaft pin 7
6 is supported by a cylindrical bearing portion 78 integrally protruded from the central portion of the flat plate portion 36 of the sensor cover 22. Thereby, the bracket 28 is connected to the sensor cover 22 and the hanger 24.
Are rotatably mounted inside a housing configured in combination with the above.

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 bracket 28 has a weight 26
Are assembled integrally. The weight portion 26 is made of metal, and a U-shaped counterweight portion 90 is provided on one side surface of a base plate portion 88 which is assembled so that the bottom surface of the bracket 28 opposite to the ball receiving portion 60 is inserted into the recess. Are formed integrally so as to be symmetrical with respect to the rotation axis X. 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 configured as described above is
The bracket 2 is located between the pair of counterweight portions 90.
8 and a support portion 72 integral with the support support plate 66 is inserted between the pair of support post portions 92, and a base portion 82 is provided between each counterweight portion 90 and each support post portion 92. It was placed,
Further, by passing each fastening piece 84 through the fastening groove 94 and fastening the fastening projection 86 to the step 94A,
The weight portion 90 is integrally attached to the bracket 28 with one touch.

A suspending rod 200 is integrally extended from the weight portion 26 from the center of the lower surface thereof.
A small plate-shaped hanging plate portion 202 is integrally formed at the free end of 00. A braking sensor 204 is disposed on the surface of the suspension plate 202.

The braking sensor 204 includes a weight 2
When the acceleration is applied to the base 6, the weight 26 is braked so as to be in a state immediately before the acceleration is applied, and the spherical sensor ball 208 is placed in a substantially conical recess provided on the upper surface of the base 206. Place this sensor ball 208
And a braking pawl 210 is placed on the top.

The braking pawl 210 has its base end pivotally attached to the free end of the support column 212 of the base 206, and is arranged to be freely rotatable about this shaft. In addition, a triangular corner portion 214 that can mesh with the tooth groove portion 212 serving as an engagement stopping portion protrudes from a free end upper portion of the braking pawl 210.

The tooth groove 212 is formed along a part of an arc centered on the rotation axis X, and the braking pawl 21
The peaks and valleys of the teeth meshing with the corners 214 are formed on the peripheral surface facing the zero over the rotatable range around the rotation axis X of the corners 214. The tooth groove portion 212 thus formed is integrally formed immediately above the braking pawl 210 at an inner surface position of the upper cover 18 which can be engaged when the braking pawl 210 is lifted by the sensor ball 208. (That is, it is formed fixed to the vehicle body side member). The tooth space 212 may be fixedly provided on the retractor base side. Further, the tooth groove portion 212 may be provided on the weight portion 26 side, and the braking sensor 204 may be provided on the retractor base 12 side. In addition, as the engagement structure between the tooth groove portion 212 and the corner portion 214 which are the engagement restraining portions, an engagement restraining structure utilizing frictional force or the like may be used.

When the same acceleration as that of the acceleration sensor main body 16 acts on the braking sensor 204, the braking sensor 204 performs a locking operation described later earlier than the acceleration sensor main body 16, or performs a locking operation with a smaller acceleration. I have.
For this reason, for example, the angle of the slope of the conical concave portion of the base portion 206 with the horizontal is set to be an acute angle from the angle of the cone of the ball receiving portion 60 with the horizontal, or the weight of the braking pawl 210 is set to be lighter. I have.

An outwardly projecting step portion 96 is formed at an intermediate position of the outer side surface of each columnar portion of the counterweight portion 90, and the weight portion 26 integrated with the bracket 28 is rotated. When done, each step 9
6 is configured to abut on the corresponding side portion 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 driven pin shown in FIG. 4 in which a shaft pin 102 which is the center of rotation is axially inserted into a bearing hole 74 and a substantially mortar-shaped recess is formed in the lower surface of its head 98. The sensor concave portion 104 is mounted so as to cover 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,
When the sensor ball 30 rolls on the distorted mortar-shaped 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, the second pawl 34 When moved so as to be separated from the receiving portion 60, the stopping protrusion 106 is locked by the mooring portion 68, and the distance between the outer peripheral portion of the ball receiving portion 60 and the outer peripheral portion of the driven concave portion 104 is determined by the sensor ball. 30 so as to be smaller than the diameter of the ball receiving portion 60 and the driven recess 10.
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 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 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. A contact surface portion 118 is provided.

As shown in FIGS. 3 and 5, a brake holding portion is provided on the side opposite to the locking claw 112 of the beam portion 108 of the first pawl 32 and on the free end side of the bearing hole 110. 12
0 is provided integrally. The braking holding portion 120 is formed in a substantially circular arc shape on the front surface, and a portion near the extended side (upper side in FIG. 5) of the locking claw portion 112 is left as a rectangular protruding stopper-shaped stopping protrusion 122. The other portion is cut out in a trapezoidal plane to form a sliding contact surface portion 124 that is recessed in the depth direction in FIG. The first pawl 32 configured as described above has a round shaft bar 126 protruding from the flange portion 40 of the sensor cover 22 passed through the bearing hole portion 110 and is 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. . At the free end of the support column 128, a hook-shaped holding portion 130 is formed integrally so as to be bent in a direction perpendicular to the axis of the support column 128 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. 5 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.

As shown in FIGS. 4 to 6, the sensor cover 2
The bracket 28 attached to the inside of the housing composed of the hanger 2 and the hanger 24 functions as a function of the weight 26 including the braking sensor 204 in a normal use state where the sensor ball 30 is placed in the ball receiver 60. And the shaft pin 7
Since the center of gravity of the entire portion supported by the shaft pins 0 and 76 is located below the rotation axis of the shaft pins 70 and 76 in the vertical direction, the ball receiving portion 60 can be kept horizontal even when the posture of the housing is inclined. The bracket 28 automatically adjusts around the rotation axis X such that the virtual vertical axis VC perpendicular to the horizontal imaginary line of the ball receiving portion 60 is held vertically. Further, when a horizontal acceleration perpendicular to the rotation axis of the shaft pins 70 and 76 is applied, the counterweight 90 is rotated by the bracket 28 and the weight 26 supported by the shaft pins 70 and 76. The moment of inertia vertically below X is offset by the moment of inertia vertically above the rotation axis X of the counterweight portion 90, so that the turning operation of the bracket 28 is suppressed.

The acceleration sensor body 1 configured as described above
6, as shown in FIGS. 2 and 3, one of the two fixing pins 56 is passed through a through hole 134 near the opening 20 of the shaft supporting side surface portion 12A, and the other fixing pin 56 is opened. 2
It is arranged at a predetermined position by passing through a long groove 136 formed in a part of the zero. 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. 1, and when the acceleration sensor main body 16 performs an acceleration detecting operation, the first pawl 32 It turns in the direction of arrow A, and its 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 moved in the direction of arrow E (the webbing pull-out rotation direction). The rotation of is stopped.

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.

Next, the operation and operation of the acceleration sensor device according to the first embodiment configured as described above will be described.

As shown in FIGS. 7 and 5, when the inclination angle of the seat back B of the reclining seat S mounted in the vehicle is adjusted, the retractor mounted on the seat back B is changed according to the angle change. The bracket 28 of the R acceleration sensor device tilts about the rotation axis X.

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

Here, the bracket 28 includes a shaft pin 70,
Although it is freely rotatable around a range of a predetermined angle around 76, even if acceleration is applied from any direction in the horizontal direction,
The braking sensor 204 operates so that the acceleration sensor device operates at a constant acceleration.

As shown in FIG. 8 and FIG. 9, for example, when acceleration in the direction of arrow B along the Y-axis is applied to the acceleration sensor device, the bracket 28 is fixed in the horizontal direction as shown in FIGS. In the state, the sensor ball 30 is
The operation of detecting the acceleration is performed by climbing the slope of the angle θ _E of 0 in the direction of arrow C. In the state of FIG. 9 in which the bracket 28 is rotatably supported around the rotation axis X, the arrow B
When the acceleration in the direction is applied, the bracket 28 rotates in the direction of arrow D, so that the sensor ball 30
Since it is necessary to climb the slope of the angle θ _{F in} the direction of arrow C, the resistance to climb the slope of the steep angle increases, and it becomes difficult to climb the slope of the steep angle. By comparison, in the state of FIG. 9, even if the acceleration in the direction of the arrow B is received, the operation of acceleration detection is difficult to be performed, and the sensitivity of acceleration detection is deteriorated.

Then, when acceleration in the direction of arrow B is applied to the rotation axis X along the Y axis orthogonal to the horizontal plane in the horizontal plane, the braking sensor 204 first locks. That is, the sensor ball 208 on the pedestal 206 climbs the gentler slope of the conical slope, pushes up the braking pawl 210, and engages the corner 214 with the tooth groove 212. In this state, the weight 2
6, the bracket 28 is supported and fixed to the tooth space 212, and maintains the posture immediately before the acceleration is applied.
The bracket 28 keeps its position relative to the retractor base 12 even when the acceleration is applied.

When the acceleration is applied, on the acceleration sensor main body 16 side, as described above, the inertia force acting on the base weight portion 90 acts so as to cancel the inertia force acting on the base weight portion 90, and the bracket 28 operates. Suppresses the rotation about the rotation axis X, so that the braking sensor 204 is more reliably operated in advance.

Subsequently, on the acceleration sensor main body 16 side, the inertia body 34 climbs the slope of the ball receiving portion 60 from above the center of the ball receiving portion 60, and moves the second pawl 34 along the driven concave portion 104. It turns in the direction of arrow F in FIG. Then, the small protrusion 105 of the second pawl 34 is brought into contact with the contact surface 1.
18, the first pawl 32 integral with the receiving surface portion 116 is rotated in the direction of arrow A in FIG. 1, and the locking pawl portion 112 of the first pawl 32 is engaged with the V gear 138 to lock the lock mechanism portion 14. Then, the operation of pulling out the webbing W is stopped.

When the acceleration in the direction of the rotation axis X is applied, the bracket 28 does not rotate in this direction, but the braking sensor 204 performs the locking operation described above,
The acceleration sensor body 16 also locks as described above,
The withdrawal operation of the webbing W is stopped. Further, even when the seat back is tilted within a tilt range set in advance, if acceleration is applied from all horizontal directions in that state, the acceleration sensor device is operated with these substantially constant predetermined accelerations. Can be.

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 by its own weight.

Next, a second embodiment of the present invention will be described with reference to FIG.
0 will be described. In the second embodiment, the acceleration sensor main body 222 and the braking sensor 204 are arranged on the plane of the rotating disk 220. That is, the rotating disk 220 as a rotating support is made of a disk material, and is rotatably supported by being supported by the rolling support member 224 from four sides on the peripheral surface. At the same time, a weight 226 is arranged on the rotating disk 220 so as to extend integrally from a part of the outer periphery thereof, so that the rotating disk 220 takes a posture in which the weight 226 is at the lowest position. ing.

The acceleration sensor main body 222 disposed on the upper surface of the rotating disk 220 has a slope 2 on which a ball receiving portion 60 which is a conical concave portion is formed on the upper surface of the base 228.
The sensor ball 30 is placed in the ball receiving portion 60. The free ends of the pillars 232 erected from the upper surface side of the base 228 are provided with the locking pawls 23.
The base end of the base 4 is mounted on the shaft.

An inclined surface 236 for forming a conical concave portion is formed on the lower surface of the locking pawl 234. The slope 236 of this recess is covered by the sensor ball 30.
A triangular corner 238 is integrally provided on the upper surface of the free end of the locking pawl 234. The corner 238 is provided with a V gear 138 of the lock mechanism 14 (see FIG. 1) (not shown).
It is facing. In addition, even if the acceleration sensor main body 222 rotates together with the rotating disk 220, the first pawl 32 (FIGS. 1 to 3) of the first embodiment described above so that the corner 238 can properly mesh with the V gear 138. Various configurations can be adopted, such as a configuration provided with (see FIG. 3).

The braking sensor 204 disposed at the lower part of the side plane of the rotating disk 220 is connected to the acceleration sensor main body 2.
22 and is formed in a similar structure. That is, the sensor ball 208 is placed on the slope 216 of the ball receiving portion which is a concave portion provided on the upper surface of the base portion 206. Further, the sensor ball 208 is configured so that a slope 218 of a concave portion formed on the lower surface portion of the braking pawl 210 pivotally supported on the free end of the support column 217 erected on the base portion 206.

Here, in order for the braking sensor 204 to perform the locking operation faster than the acceleration sensor main body 222, the base 206 slope 216 is formed more gently than the slope 230 of the ball receiving portion 60 in the base 228. That is, the angle between the inclined surface 216 and the horizontal plane is made more acute. Or
The locking operation is accelerated by various means such as making the braking pawl 210 lighter than the locking pawl 234.

The virtual vertical axis VC of the inclined surface 230 and the inclined surface 216 of the ball receiving portion 60, which is perpendicular to the respective horizontal imaginary lines, is vertical when the weight of the rotating disk 220 is at the lowest position. It is configured so that

The braking pawl 210 of the braking sensor 204
A triangular corner portion 214 is provided on the upper surface of the free end at a position above the free end upper surface so as to be able to mesh with the tooth groove portion 212 fixed to the retractor base 12 side. The tooth groove portion 212 is provided on the rotating disk 220 side, and the braking sensor 20 is provided.
4 may be provided on the retractor base 12 side.

Next, the operation and operation of the acceleration sensor device according to the second embodiment configured as described above will be described. As shown in FIG. 7, when the seat back B of the reclining seat S is tilted and adjusted, the rotating disk 220 of the acceleration sensor device attached to the retractor R rotates, and the acceleration sensor main body 222 and the braking sensor 204 Vertical axis VC is kept vertical. When a horizontal acceleration is applied in this state, first, the braking sensor 204 quickly performs a locking operation. That is, the sensor ball 208 climbs up the slope 216 which is gentler than the slope 230, and the braking pawl 2 (in addition to this, for example, when the sensor ball 208 moves the braking pawl 210 lighter than the locking pawl 234 more quickly).
The corner portion 238 of the accumulator 34 is engaged with the tooth groove portion 212 to prevent the rotation of the rotating disk 220, and the vertical axis VC of the acceleration sensor main body 222 is held in the vertical direction. In this holding state, the angle formed by the slope 230 with respect to the horizontal direction does not change compared to before the horizontal acceleration is applied. Perform lock operation.

The configuration, operation, and effects of the second embodiment other than those described above are the same as those of the first embodiment, and therefore detailed description thereof will be omitted.

Further, the vehicle acceleration sensor device according to the present invention is not limited to the above-described configuration. When a horizontal acceleration is applied to the bracket 28 of the acceleration sensor device shown in FIGS. When the acceleration sensor main body 222 shown in FIG. 10 is stopped before the turning operation of the rotating disk 220 is stopped before the turning operation of the bracket 28 is started, or when the acceleration in the horizontal direction is applied to the acceleration sensor body 222 shown in FIG. It is possible to take various mechanical and electrical braking and holding means for stopping the rotatable portion of the sensor device before the start of rotation of the rotatable portion when horizontal acceleration is applied. Of course. In the present invention, the lock mechanism 14 may be operated by an output of an acceleration sensor to operate a lock operation target such as a winding shaft.

[0062]

The acceleration sensor device for a vehicle according to the present invention has an excellent effect that the acceleration acting on the vehicle body can be detected and the vehicle can be properly operated even if the attitude of the vehicle is changed.

[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 vertical sectional view of the vehicle acceleration sensor device according to the first embodiment of the present invention, taken along line IV-IV of FIG. 5;

FIG. 5 is a partial 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.

6 is a longitudinal sectional view of the vehicle acceleration sensor device according to the first embodiment of the present invention, corresponding to line VI-VI in FIG. 5;

FIG. 7 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. 8 is an explanatory diagram for explaining an operation state of a main part of the vehicle acceleration sensor device according to the first embodiment of the present invention.

FIG. 9 is an explanatory diagram for explaining an operation state of a main part of the vehicle acceleration sensor device according to the first embodiment of the present invention.

FIG. 10 is a schematic front view showing a main part of a vehicle acceleration sensor device according to a second embodiment of the present invention.

[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 32 First Paul (Output Member) 34 Second Paul (Output Member) 60 Ball Receiver 70 Shaft Pin 74 bearing hole 76 shaft pin 78 bearing portion 102 shaft pin portion 104 driven recess 110 bearing hole 138 V gear 204 braking sensor (braking holding means) 206 base 208 sensor ball 210 braking pawl 212 tooth groove portion (for braking) Holding means) 214 corner portion 216 slope 220 rotating disk (rotating body) 222 acceleration sensor main body 224 rolling support member 226 weight (weight) 228 base portion 230 slope 234 locking pawl 238 corner portion

Claims (3)

[Claims] 1. An acceleration sensor device for a vehicle for driving an output member by inertially moving an inertial body according to an acceleration applied to a vehicle, wherein the acceleration sensor is rotatably supported by a member on a vehicle body side. A main body, or at least a member portion such as a bracket movably provided with an inertial body of the acceleration sensor main body, and the acceleration sensor main body side, or a member portion such as a bracket, which is disposed integrally with the main body or the vehicle body side member is a vehicle body The weight provided to rotate the acceleration sensor main body or the member part such as the bracket by its own weight to take a constant posture in the vertical direction even when the mounting angle to the When this horizontal acceleration is detected, the rotation of the acceleration sensor main body or the member such as the bracket is stopped faster than the movement of the inertial body. A vehicle acceleration sensor device, comprising: braking holding means for stopping the vehicle. 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. And a bracket on which the inertial body is rotatably supported around, and the inertial body is arranged so as to be able to move by inertia. A weight provided on the bracket so as to rotate around and take a constant posture in the vertical direction, and the inertial body operates faster than a moving operation when receiving an acceleration in a horizontal direction, and And a brake holding means including a braking sensor and an engagement restraining portion disposed between the bracket and the housing so as to restrain the rotation operation. The vehicle acceleration sensor and wherein the. 3. An acceleration sensor device for a vehicle for driving an output member by inertially moving an inertial body according to acceleration applied to a vehicle, wherein the acceleration sensor device is rotatably supported by a fixed portion on a vehicle body side. A rotator, and a weight provided on the rotator so that the rotator is rotated by its own weight to take a constant posture in the vertical direction even when the angle of attachment to the vehicle body is changed, An acceleration sensor main body fixed to the rotating body and having the inertial body movably moved by inertia; and a rotating operation of the rotating body that operates faster than a moving operation when the inertial body receives a horizontal acceleration. A vehicle, comprising: a braking sensor and an engagement restraining portion disposed between the rotating body and the fixed portion on the vehicle body side so as to restrain a dynamic operation. Acceleration sensor device