JPH09207714A - Acceleration sensor for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect acceleration working on a car body even when a position on which an acceleration sensor device for a vehicle is installed is changed against the vehicle and to work to output when the car body is tilted at more than a specified angle. SOLUTION: An inertial body 34 is supported in a supporting groove 32 of a sensor bracket 12 free to move by axially supporting the sensor bracket 12 by a shaft roughly in parallel with a tilting direction of a seat back, etc., on the side of acar body against a sensor housing 10 fixed on the side of the car body of the seat back, etc. An output interlocking member 40 is made to output interlocked with motion of this inertial body 34 to climb the supporting groove 32, a forced drive member 70 interlocked with oscillating motion at more than a specified angle of the sensor bracket 12 works to output, and webbing drawing restraining operation, etc., of a retractor is practiced.

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 webbing is not pulled out from a retractor of a seat belt device. Therefore, the retractor or the like is equipped with a vehicle acceleration sensor device for detecting a large acceleration of a predetermined value or more applied to the vehicle.

Such devices equipped with a vehicle acceleration sensor device, such as a seat belt retractor, are attached to a vehicle body while maintaining a predetermined angle, such as being attached to a vehicle center pillar or a seat cushion portion. It is usually done.

As described above, the vehicle acceleration sensor device mounted on the conventional retractor is premised to be mounted on the vehicle body while maintaining a predetermined angle, and is configured to detect acceleration in a predetermined direction. When it is attempted to attach the acceleration sensor to a portion of the reclining seat, such as a seatback retractor, whose angle is changed with respect to the vehicle body, the angles of these components may be changed. That is, when the occupant tilts the seat back to adjust the seating posture, the mounting posture of the acceleration sensor device of the retractor is changed, and an acceleration different from the set acceleration to be detected is detected.

Further, when the vehicle body is tilted by a predetermined angle or more, it may be required to prevent the webbing pulled out from the retractor from being further pulled out.

[0006]

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,
An object of the present invention is to provide an acceleration sensor device capable of detecting acceleration acting on a vehicle body and performing output operation when the vehicle body tilts by a predetermined angle or more.

[0007]

According to a first aspect of the present invention, there is provided an acceleration sensor device for a vehicle, which is an acceleration sensor for a vehicle for inertially moving an inertial body according to a vehicle acceleration, and supports the inertial body and swings the vehicle toward the vehicle. A sensor bracket that is supported, and an output member that is driven by inertial movement of an inertial body,
A forced drive member that is attached to the sensor bracket and that drives the output member when the amount of tilt of the vehicle reaches a predetermined value.

With the above-described structure, the sensor bracket maintains its current position so that the acceleration direction detected by the sensor bracket is not changed even when the vehicle portion to which the sensor bracket is attached is tilted. In addition, if the entire body tilts more than a predetermined angle,
The forced drive member performs an output operation of driving the output member, and the output operation allows the retracting webbing withdrawal stop operation and the like to be performed.

According to a second aspect of the present invention, in the vehicle acceleration sensor device according to the first aspect, the forcible drive member is a protrusion integrally projected from the sensor bracket.

With the above construction, when the vehicle body tilts by a predetermined angle or more, the sensor bracket relatively swings by a predetermined angle or more, and the projection integral with the sensor bracket drives the output member. Output operation.

According to a third aspect of the present invention, in the vehicle acceleration sensor device according to the first aspect, a sensor housing to which a sensor bracket is swingably mounted is supported by a seat back of a reclining seat and tilted by a reclining operation. It is characterized in that a forced drive member is attached to the sensor housing.

With the above structure, when the passenger adjusts the seat back of the reclining seat by tilting the sensor housing and the sensor bracket is rotated by a predetermined angle or more with respect to the sensor housing fixed to the seat back, the sensor The forced drive member integrated with the bracket rotates,
The output member is driven to perform an output operation.

[0013]

1 shows 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. 11, the retractor R used in this seat belt device is arranged above the seat back B of the reclining seat S in the vehicle. The sensor housing 10 is fixedly installed on the retractor R. As shown in FIG. 1, the sensor housing 10 is configured as a case-shaped housing in which a support and shaft support structure for mounting the sensor bracket 12 and the output member of the output mechanism are formed.

As shown in FIG. 1, a support plate 14 is projectingly provided on the inner middle portion of the sensor housing 10. A small columnar shaft pin 16 is provided upright in the center of the flat surface of the support plate 14. The shaft pin 16 constitutes a part of the swing center axis O that supports the sensor bracket 12, and a bearing recess 18 is formed at one end of the sensor housing 10 in an extension of the center axis O. There is. This swing center axis O
Is parallel to the swing center axis O1 with respect to the seat base member 124 of the seat back B shown in FIG.

A shaft rod 20 is integrally provided upright near the other end of the sensor housing 10 for axially supporting the output member. Further, an escape recess 22 for accommodating a part of the output mechanism is formed at a position between the support plate 14 of the sensor housing 10 and the shaft rod 20.

As shown in FIG. 1, the sensor bracket 12 mounted on the sensor housing 10 constructed as described above is a side surface in which the free end side portions 24 and 36 are erected parallel to each other from both ends of the bottom plate portion 30. It is formed in a substantially U shape,
An arm portion 26 projects from the outer surface of the one free end side portion 24. This arm portion 26 has a swing center axis O.
And a free end portion thereof is bent upward at a right angle from the swing center axis O, and the whole is projectingly provided in a hook shape.
An upper weight 28 is integrally provided at the free end of the arm portion 26.

The upper weight 28 is made of metal or other material having a predetermined weight and is provided integrally with the arm 26.

On the upper surface of the bottom plate portion 30 between the two free end sides of the sensor bracket 12, that is, on the plane portion on the side of the swing center axis O, a mortar shape centered on the plane center is formed. A support groove 32 is provided. The support groove 32 is formed in a V-shaped vertical cross section, and the V-shaped inclination angle is formed to be a predetermined inclination angle. In the support groove 32, a spherical metal inertial body 34 having a predetermined weight is movably mounted. Therefore, the inertial body 34 is designed to climb up the bearing groove 32 when a predetermined acceleration is applied in the horizontal direction.

A through opening 38, which is a semicircular opening, is formed at the tip of the other free end side portion 36 of the sensor bracket 12. An output interlocking member 40 is attached to the through opening 38 portion of the other free end side portion 36 as shown in FIG. The output interlocking member 40 is formed in an integrated structure in which the driven receiving portion 42 and the connecting portion 44 are bent. The driven receiving portion 42 is formed by integrally forming a circular plate portion 46 at the tip portion of a rectangular plate, and a spherical concave portion is formed in a flat surface portion of the circular plate portion 46 facing the bottom plate portion 30 side. The inertial body 34 is sandwiched between the spherical concave portion of the circular end portion 46 and the support groove 32 of the bottom plate portion 30.

An intermediate portion of the output interlocking member 40,
A bearing hole portion 48 is bored at a portion which is a base end portion of the driven receiving portion 42 and abuts on a base end portion of the connecting portion 44, and a shaft pin 50 axially inserted into the bearing hole portion 48 is attached to the sensor bracket 1.
The output interlocking member 40 is axially supported with respect to the free end side portion 36 by passing through a bearing hole provided in the free end side portion 36 of No. 2.

In this state, the driven receiving portion has its shaft pin 5
0 through the shaft support portion through the through opening 38 and the bottom plate portion 3
It has been extended above zero. Therefore, the rotational movement of the driven receiving portion 42 around the shaft pin 50 is restricted, and the inertial member 34 sandwiched between the concave portion on the spherical surface of the driven receiving portion 42 and the support groove 32. By the inclined surface of the support groove 32, the driven receiving portion 42 is moved to the shaft pin 5 at a predetermined height.
Since the rotation around 0 is stopped, the inertial body 34 is pressed against the driven receiving portion 42 so that the inertial body 34 cannot further climb the slope of the support groove 32. Therefore, inertial body 3
No. 4 does not separate from the state of being sandwiched between the support groove 32 and the spherical concave portion of the circular end portion of the driven receiving portion 42.

When the inertial body 34 moves up the slope of the support groove 32 in this way, the driven receiving portion 42 rotates in the direction of arrow A shown in FIG. 1, and the connecting portion 44 also moves in the direction of arrow A. Rotate in the direction. As shown in FIGS. 1 and 8, the connecting portion 44 is formed so as to be bent and extended in a dogleg shape from the bearing hole portion 48 of the output interlocking member 40. A spherical interlocking head 52 is integrally formed at the free end of the connecting portion 44. The interlocking head 5 of the output interlocking member 40
An interlocking stopper member 54, which constitutes a part of the output mechanism, is connected to 2 so as to interlock with each other.

The interlocking stopper member 54 is formed in a substantially hook shape, and a cylindrical shaft hole 58 is bored in an intermediate portion of the rectangular pillar support 56, and one of the shaft holes 58 is formed. The end opening is closed by a small columnar lid 60.

The shaft rod 20 of the sensor housing 10 is inserted into the shaft hole 58 opened on the side surface of the shaft support of the shaft hole 58, and the interlocking stopper member 54 is freely rotatable around the shaft rod 20. Is pivotally supported. At one end of the shaft support 56 of the interlocking stopper member 54 (the end on the interlocking head 52 side of the output interlocking member 40), the interlocking protrusion 6 having a side L shape is formed.
2 are integrally projected. The interlocking protrusion 62 holds the interlocking head 52 in the connecting portion 44 of the output interlocking member 40 between the interlocking protrusion 62 and the shaft support 56.

A stopper member 66 is integrally projectingly provided at an end portion of the shaft strut portion 56 of the interlocking stopper member 54 on the retractor gear portion 64 side. The free end portion of the stopper member 66 is formed in a side surface U shape, the free end portion extends toward the retractor gear portion 64, and the free end portion is formed into a toothed shape having an acute angle. The tooth stop portion 68 is integrally formed.

By rotating the interlocking stopper member 54 around the shaft 20 in the direction of arrow B, the engaging tooth portion 68 of the stopper member 66 is moved in the direction of arrow C, and each of the retractor gear portions 64 is moved. It is configured to mesh with the tooth space and to brake the retractor gear portion 64. As a result, the inertia lock mechanism of the retractor R (the details of which are publicly known and will not be described) operates. The rotation of the winding shaft that winds up the seat belt webbing W is stopped, so that the webbing can be prevented from being pulled out.

As shown in FIGS. 2 and 3, the free end side portion 36 of the sensor bracket 12 is provided with forcible drive members 70 near both ends of the through opening 38, respectively.
It is provided so as to project in the radial direction centered on. These forced drive members 70 are each formed in the shape of a small rectangular projecting piece,
Its tip is rounded. When the sensor bracket 12 pivots about the swing central axis O by a predetermined angle, each of the forcible driving members 70, as shown in FIG.
The lower end of the intermediate portion of 6 is brought into contact with the lower end portion thereof, and the stopper member 66 is pushed to move the interlocking stopper member 54 to the shaft rod 20.
Around the arrow in the direction of arrow B, and the engaging tooth portion 68 formed at the free end portion of the stopper member 66 has the gear portion 6 for the retractor.
4 is configured to be locked in each tooth groove of No. 4.

As described above, the sensor bracket 12 rotatably supported about the swing center axis O has an output interlocking member 40 forming a part of the output mechanism and an upper side provided on the arm portion 26. Since the weight 28, the forcible drive member 70, and the inertial body 34 are arranged, they are arranged with respect to the swing center axis O regardless of the tilt of the seat back B, as shown in FIG.
In order to maintain the original position shown in FIG. 9, a lower weight 72 as a center of gravity setting means is provided on the bottom surface portion of the bottom plate portion 30 of the sensor bracket 12 opposite to the support groove 32.

In the lower weight 72, the center of gravity of the sensor bracket 12, which is pivotally supported around the swing center axis O, and the attached portion thereof are lower than the swing center axis O.
On the side, the vertical axis V of the support groove 32 holds the vertical position, and the inertial body 34 is positioned at the deepest portion of the support groove 32. When an acceleration in the vehicle front-rear direction (arrow FR direction) is applied to the sensor bracket 12, the sensor bracket 12 moves on the swing center axis O due to an inertial force with respect to the acceleration acting on the upper weight 28 provided on the arm portion 26. It is configured so as to hold the original position of FIGS. 1 and 9 without rotating around.

Further, the upper weight 28 may be any one that cancels out the inertial force acting on the lower portion of the swing center axis O of the sensor bracket 12, such as the sensor bracket 12, the output interlocking member 40, and the lower weight 72. The amount of displacement of the arm portion 26 from the swing center axis O and the weight of the upper weight 28 may be set so as to cancel the inertial force. To this end, when the mass of the other parts can be substantially ignored as compared with the upper weight 28 and the lower weight 72, for example, the upper weight 28, the lower weight 72, and the inertial body 34 are made of metal, and the inertia When the body 34 is arranged on the swing center axis O and the other parts are made of synthetic resin, the upper weight 28 and the lower weight 7 are formed.
If the lengths from the swing center axis O of 2 are L1 and L2, and the weights are W1 and W2, then W1 <W2, and substantially W1 × L1 = W2 × L2.

As a result, when the seat back B is reclined, the lower weight 72 gives a force for returning to the original position of the sensor bracket 12, and the inertial force of the upper weight 28 and the lower weight 72 cancels each other when the acceleration indicated by the arrow FR is applied. As a result, the original position of the sensor bracket 12 is maintained. When the mass of the parts other than the upper weight 28 and the lower weight 72 has a substantially non-negligible mass, the length up to the center of gravity of the weight above the swing center axis O is L1, and Each part may be manufactured so that the length to the center of gravity of the weight is L2 and the above equation is satisfied.

The center of gravity setting means may be any means as long as the center of gravity of the sensor bracket 12, the output interlocking member 40, and the lower weight 72 with respect to the swing center axis O is set below the swing center axis O. Can be configured. For example, the bottom plate portion 30 of the sensor bracket 12 may be made thick and heavy, or the swing central axis O may be set near the free ends of the two free end side portions 24.

The sensor bracket 12 has a bottom plate portion 3
Even if the sensor housing 10 is rotated relative to the swing central axis O by the action of the lower weight 70 provided on the lower bracket 7, the sensor bracket 12 itself is attached to the lower weight 7.
The sensor bracket 12 is held in the original position shown in FIG. 1 by pulling in the vertical direction by the attractive force acting on 2.

The forcible drive member 70 in the first embodiment constructed as described above is not only provided on the free end side portion 36 of the sensor bracket 12 as shown in FIG. 1, but also in FIG. 4 and FIG. As shown, the arm portion 26 is integrally projectingly provided on an extension shaft portion along the swing center axis O, and when the sensor bracket 12 is rotated with respect to the swing center axis O by a predetermined angle, The protruding end portion of the forcible drive member 70 may be directly meshed with each tooth groove portion of the retractor gear portion 64 to stop the rotation of the retractor gear portion 64.

Further, as shown in FIG. 6 and FIG. 7, the forcible driving member 70 has a driving gear portion 74 provided on the arm portion 26 meshed with a driven gear portion 76 and the like, and is integrally projected to the driven gear portion 76. The forced drive member 70 thus engaged meshes with each tooth groove of the retractor gear portion 64, and the retractor gear portion 64
May be configured to stop the rotation of the. It should be noted that the mechanism for interlocking the sensor bracket 12 and the forcible drive member 70 can of course take various configurations.

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

First, when the seat back B of the reclining seat S mounted in the vehicle is tilted, the sensor housing 10 of the acceleration sensor device of the retractor R mounted on the seat back B is seated (not shown) along with this movement. Both of the backs tilt around the swing center axis O.

At this time, the sensor bracket 12 portion pivotally supported around the swing center axis O maintains its original position when the seat back is not tilted by the action of the weight of the lower weight 72 which is the center of gravity setting means. To do. That is,
The sensor bracket 12 portion is in the same state as when it is relatively rotated about the swing central axis O, and maintains this original position.

Further, when acceleration in a direction perpendicular to the swing center axis O is applied to the portion of the sensor bracket 12 which is rotatably supported about the swing center axis O,
An inertial force due to this acceleration acts on the lower weight 72.

At the same time, an inertial force with respect to the acceleration acting on the upper weight 28 fixed to the sensor bracket 12 via the arm portion 26 acts, and the lower weight 7 described above is operated.
The inertial force acting on the upper weight 28 cancels out the inertial force with respect to 2 and brakes the sensor bracket 12 from rotating around the swing central axis O as shown in FIG.

At this time, the axis of the inertial body 34 is the swing center axis O.
Since it is on the upper side and does not receive any restraint from the upper weight 28, the driven receiving portion 42 of the output interlocking member is rotated in the arrow A direction by climbing the slope of the support groove 32. In conjunction with this operation, the connecting portion 44 of the output interlocking member 40 pushes the interlocking protrusion 62 of the interlocking stopper member 54 in the direction of arrow A, and rotates the interlocking stopper member 54 around the shaft 20 in the direction of arrow B. In this way, in the interlocking stopper member 54 rotated around the shaft 20 in the arrow B direction, the engaging tooth portion 68 of the stopper member 66 moves upward in the arrow C direction and meshes with the tooth groove of the retractor gear portion 64. Thus, the retractor gear 64 is stopped, and the stopper mechanism of the retractor device (not shown) is operated to stop the pulling-out operation of the webbing wound around the retractor.

Further, the seat back of the reclining seat equipped with the vehicle acceleration sensor device of the present embodiment configured as described above has a tilt angle of 12 to 27 degrees, for example, a tilt angle of 15 to 20 degrees. When tilted to a predetermined tilt angle within the range, the forced drive member 70 operates to brake the retractor gear portion 64. That is, when the seat back equipped with this acceleration sensor device is tilted, the sensor housing 10 is tilted in accordance with the operation. At this time, the sensor bracket 12 tilts around the swing center axis O and holds its original position by the action of its center of gravity setting means. The relative rotation between the sensor bracket 12 and the sensor housing 10 at this time causes the sensor housing 1 to move.
The interlocking stopper member 54 pivotally supported by the shaft rod 20 of 0 rotates relative to the forcible driving member 72 of the sensor bracket 12, and a part of the stopper member 66 of the interlocking stopper member 54 hits the forcibly driving member 70. The interlocking stopper member 54 is rotated around the shaft 20 in the arrow B direction.

Then, the engaging tooth portion 68 of the stopper member 66 is moved in the direction of arrow C, meshes with each groove of the teeth of the retractor gear portion 64, and brakes the retractor gear portion 64. As a result, the retractor device (not shown) operates so that the webbing cannot be pulled out any more. In the embodiment shown in FIG. 1, since the two forced drive members 70 are installed at rotationally symmetrical positions with respect to the swing center axis O of the sensor bracket, the sensor bracket rotates clockwise around the swing center axis O. , Or even when it is rotated counterclockwise, it is interlocked with the interlocking stopper member 54 so that the retractor gear portion 5
You can brake 4.

Note that, in the other structural examples of the forcible drive member shown in FIGS. 4 to 7, only when the sensor bracket 12 is rotated clockwise in FIG. 4 and FIG.
The forcible drive member 70 directly engages with the groove of each tooth of the retractor gear part 64 to prevent the retractor gear part 64 from rotating.

Next, looking at the relationship between the support groove 32 of the sensor bracket 12 and the inertial body 34 in the present embodiment, as shown in FIG. 10, the sensor bracket is in its original position, that is, the support groove 32 is horizontal. In the state where the angular position θ1 is formed, when acceleration in the direction of arrow FR in FIG. 10 is applied to the inertial body 34 of the acceleration sensor having the inertial body 34, the inertial body 34 moves the slope of the support groove 32 in the arrow FR direction. Climb and work properly by interlocking an output interlocking member (not shown).

On the other hand, the sensor bracket 12 is shown in FIG.
When it receives the acceleration in the direction of the arrow FR shown by 1 and rotates clockwise as shown in the drawing, the angle θ2 formed by the support groove 32 and the horizontal direction becomes larger than θ1 shown in FIG. Therefore, the inclination angle of the support groove 32 becomes large θ2, and the inertial member 34
Cannot climb the slope of the bearing groove 32 having this large inclination angle. Therefore, the inertial body 34 cannot operate the output interlocking member 40 in this state, and the acceleration sensor cannot properly detect acceleration.

However, in the present embodiment, the upper weight 28 is provided at a position displaced above the swing center axis O by the arm portion 26, and the inertia of the portion below the swing center axis O is provided by the upper weight 28. Counteract the power,
Since the sensor bracket 12 is prevented from swinging, the inertial body 34 detects a predetermined acceleration and works properly.

Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment is a modification of the configuration in which the upper weight and the lower weight are arranged. In the second embodiment, the same members as those in the above-described first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the acceleration sensor device according to the second embodiment, the sensor bracket 12 is attached to the sensor housing 10.
Is swingably supported, and the output interlocking member 40 pivotally supported by the sensor bracket 12 is driven by the inertial body 34, whereby the output interlocking member 40 operates the interlocking stopper member 54. It is configured to brake the retractor gear portion 64.

The sensor housing 10 is formed in a substantially rectangular box shape with its upper lid portion removed, and support projections 82 are provided at the center of the outer sides of the pair of side surface portions 80. Each supporting protrusion 82 has a through hole 8 for fastening.
4 are perforated respectively. This sensor housing 1
0 is fastened to the frame 86 of the retractor. Therefore, the retractor frame 86 is provided with an inverted U-shaped notch 88 on one side thereof, and the projections 92 corresponding to both ends of the notch 88 are formed. Corresponding through holes 90 are formed in the respective holes so as to communicate with the above-described through holes 84 of the sensor housing 10. Note that the retractor frame 86 of FIG. 9 is shown in a reduced size as compared with the other illustrated ones due to space limitations. The support projection 82 of the sensor housing 10 is aligned with the projection 92 of the notch 88 of the retractor frame 86, and the through hole 84 and the through hole 90 are aligned with each other. It is fastened to the frame 86.

Bearing holes 96 are bored in the other opposing side surfaces 94 of the sensor housing 10.
A part of the bearing hole 96 is the sensor housing 10.
It is notched so that it is opened to the end face of. A pair of shaft abutment parts 98 are provided upright on the upper surface of the one side part 80. Each shaft abutment portion 98 is formed in the shape of a small rectangular projecting piece, and a bearing hole 100 is formed therein.
Each of the bearing holes 100 is also cut out so that a part thereof is opened to the end surface portion of the shaft support 98.

As shown in FIG. 9, the sensor bracket 12 pivotally supported on the above-mentioned sensor housing 10 is formed in a substantially U-shape on the front side. That is, the free end side portions 24 are erected in parallel from both ends of the bottom plate portion 30, respectively. Bottom plate 3
A support groove 32 having a V-shaped cross section is formed in a plane portion in the direction in which the free end side portion 24 extends at 0. Further, the bottom plate portion 3 is provided on a flat surface portion of the bottom plate portion 30 opposite to the supporting groove 32.
The holding portions 102, which are formed by extending in a hook shape so as to face each other from both sides of 0, are integrally projected, and the pair of holding portions 1
The lower weight 72 having a rectangular flat plate shape is fitted into the pocket 104 formed between the sensor housing 10 and the sensor housing 10.
It is designed to fit together with.

Bearing holes 106 are formed in the pair of free end side portions 24 of the sensor bracket 12, respectively.
Each bearing hole 106 is notched so that a part thereof opens to the end surface of each free end side portion 24.

A pocket portion 108 for the upper weight 28 is integrally formed on a flat surface portion of the one free end side portion 24 opposite to the bottom plate portion. The pocket portion 108 is formed in a small box shape having an open upper plane. This pocket part 1
A small rectangular upper weight 28 is fitted and housed in the box internal space 08. Further, a shaft rod 110 is provided so as to project from the outer flat surface portion of the pocket portion 108.

On the other free end side portion 24 of the sensor bracket 12, a shaft rod 112, which is coaxial with the above-mentioned shaft rod 110, is provided on the side surface opposite to the bottom plate portion 30 thereof. Further, a pair of forcible drive members 70 are provided so as to project on the free end side portion of the free end side portion 24. Each of the forcible driving members 70 is formed in a quarter arc shape and is arranged so as to face each other with a predetermined distance therebetween so as to face each other. In the sensor bracket 12 configured as described above, the shaft rods 110 and 112 are respectively attached to the bearing holes 9 of the sensor housing 10.
The sensor bracket 12 is attached to the sensor housing 10 so as to be axially supported.

An output interlocking member 40 is pivotally supported on the sensor bracket 12. The output interlocking member 40 is formed by integrally forming a connecting portion 44 with a driven receiving portion 42. Driven part 42
Is formed into a disk shape, and the surface portion facing the support groove 32 is formed into a substantially spherical concave portion that receives the inertial body 34. A prismatic shaft support 114 is formed at the base end of the driven support 42, and shaft pins 116 project from both ends of the shaft support 114. In addition, the inertial body 3 of the driven receiving portion 42
A small projecting piece-like connecting portion 44 having an arc-shaped free end side portion 44 </ b> A is integrally provided upright on the surface portion on the opposite side to 4. In the output interlocking member 40 configured as described above, the shaft pin 116 is attached to each bearing hole 1 of the sensor bracket 12.
It is axially inserted into 06 and mounted so as to be swingable.

The interlocking stopper member 54 is pivotally supported by the pair of shaft support bases 98 of the sensor housing 10 in which the sensor bracket 12 pivotally supporting the output interlocking member 40 is inserted. The interlocking stopper member 54 is provided with a locking tooth portion 46 formed by bending a free end portion of a small rectangular plate-shaped stopper member 66 toward the retractor gear portion 64 side. A rectangular block-shaped shaft support 118 is integrally provided on the base end side of the stopper member 66.
A shaft pin 120 is projectingly provided on each of both end sides. Further, a small rectangular forced drive member interlocking portion 122 is integrally projected at a predetermined position on one side of the stopper member 66.

In the interlocking member 54 thus constructed, the shaft pin 120 is attached to each shaft support 9 of the sensor housing 10.
By being inserted into the bearing hole 100 in the shaft 8, it is mounted swingably.

The acceleration sensor device constructed as described above is mounted on the retractor frame 86 so that the engaging tooth portion 46 of the stopper member 66 is directly below the tooth surface of the retractor gear portion 64 mounted on the retractor frame. It is arranged so that it can be engaged with and disengaged from.

The retractor R (not shown) having the retract frame 86 is so constructed as to restrain the pulling-out operation of the webbing W pulled out from the retractor R by restraining the retractor gear 64.

Next, the operation and operation of the second embodiment having the above structure will be described. When the retractor equipped with the acceleration sensor device of the second embodiment is mounted on the seat back B portion of the reclining seat S of the vehicle and is used, when the seat back B is tilted and adjusted, the sensor together with the retractor frame is used. Housing 10
Is tilted. At this time, the sensor bracket 12 holds the sensor housing 10 in its original position by the action of the lower weight 72 around the shaft rod 110 concentric with the swing center axis O.
Rocks relative to. Therefore, the support groove 32 maintains a predetermined angle of the inclined surface with respect to the horizontal direction.

When acceleration is applied to the acceleration sensor device according to the second embodiment in the direction of the arrow D in the figure, with respect to the shaft rod 112 which coincides with the swing center axis O of the sensor bracket 12,
The inertial force acting on the upper weight 28 is on the upper side of the swing center axis O with respect to the inertia moment generated in the sensor bracket 12, the lower weight 72, and the output interlocking member 40 whose center of gravity is downward, and cancels this. Hold the sensor bracket 12 in place.

Therefore, only the inertial body 34 moves in the direction opposite to the arrow D, rolls in the support groove 32 and climbs, and the inertial body 34 lifts the output interlocking member 40 so as to rotate in the arrow E direction. . Then, the connecting portion 44 of the output interlocking member 40 connects the stopper member 66 of the interlocking stopper member 54 with the arrow F in FIG.
The locking tooth portion 46 of the stopper member 66 engages with the tooth groove between the teeth of the retractor gear portion 64 to brake the retractor gear portion 64.

When the retractor gear portion 64 is thus stopped, the retractor (not shown) works to prevent the webbing pulled out from the retractor from being pulled out.

Further, in the acceleration sensor device according to the second embodiment, the sensor housing 10 together with the retractor frame is used.
Is tilted within a range of 12 to 27 degrees, for example, to a position of a predetermined angle between 15 to 20 degrees, the sensor bracket 12 forcibly driven relative to the sensor housing 10 is driven. The member 70 hits the interlocking portion 122 of the stopper member, lifts the stopper member 66 in the direction of the arrow F, and the engaging tooth portion 46 of the stopper member 66 is meshed with the groove of the tooth of the retractor gear portion 64 to form the retractor gear 54. Stop. The forced drive member 70
Are formed at symmetrical positions with respect to the swing center axis O, the stopper member 66 is operated regardless of whether the sensor bracket 12 is rotated clockwise or counterclockwise. The webbing pull-out operation of the retractor device can be stopped.

The configuration of the acceleration sensor device of the present invention is not limited to the configuration of the above-mentioned embodiment,
For example, the inertial body 34 is configured to be swingable like a pendulum, and the inertial body swinging like a pendulum is also applicable to an acceleration sensor device configured to move an output interlocking member to detect acceleration, or vertically. The configuration of the present invention is also applied to other acceleration sensor devices such as an acceleration sensor device using a substantially cylindrical inertial body in which the output interlocking member placed on the top is lifted by being tilted by a predetermined angle. Of course you can.

[0068]

According to the acceleration sensor device of the present invention, the acceleration acting on the vehicle body can be detected even when the posture of the vehicle equipped with the acceleration sensor device is changed, and when the vehicle body tilts by a predetermined angle or more. It has an excellent effect of performing an output operation.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an acceleration sensor device according to a first embodiment of the invention.

FIG. 2 is a side view showing a state in which the sensor bracket taken along line II-II in FIG. 1 is in an original position.

FIG. 3 is a side view showing a state in which the sensor bracket taken along line II-II in FIG. 1 is in a tilted position.

FIG. 4 is a view showing another example of the structure of the forcible driving member in the acceleration sensor device according to the first embodiment of the invention, which is indicated by I in FIG.
It is a side view corresponding to the I-II line.

5 is a front view of a main portion of a forced drive member portion in the configuration example shown in FIG.

FIG. 6 is a side view corresponding to line II-II in FIG. 1 showing still another configuration example of the forced drive member in the acceleration sensor device according to the first embodiment of the invention.

7 is a front view showing a main part of a forced drive member portion in the configuration example shown in FIG. You.

FIG. 8 is a side view showing an output interlocking member and an interlocking stopper member in the acceleration sensor device according to the first embodiment of the present invention.

FIG. 9 is an exploded perspective view of an acceleration sensor device according to a second embodiment of the invention.

FIG. 10 is a longitudinal sectional view of an essential part for explaining the in-situ relationship between the support groove of the sensor bracket and the inertial body in the acceleration sensor device of the present invention.

FIG. 11 is a longitudinal sectional view of an essential part for explaining the state of the support groove of the sensor bracket and the inertia body in the acceleration sensor device of the present invention when the sensor bracket is tilted.

FIG. 12 is a schematic side view illustrating the state where the acceleration sensor device of the present invention is attached to a seat back of a reclining seat.

[Explanation of symbols]

 10 ... Sensor housing 12 ... Sensor bracket 16 ... Shaft pin 18 ... Bearing recess 26 ... Arm part 28 ... Upper weight 30 ... Bottom plate part 32 ... Support groove 34・ ・ ・ Inertia 40 ・ ・ ・ Output interlocking member (output member) 42 ・ ・ ・ Drive receiving part 44 ・ ・ ・ Connecting part 54 ・ ・ ・ Interlocking stopper member 64 ・ ・ ・ Retractor gear part 66 ・ ・ ・ Stopper member 68 ... Engaging tooth portion 70 ... Forced driving member 72 ... Lower weight (center of gravity setting means) 98 ... Shaft abutment portion 102 ... Holding portion 104 ... Pocket portion 108 ...・ Pocket part 110 ・ ・ ・ Axis rod

Claims (3)

[Claims] 1. A vehicle acceleration sensor device for inertially moving an inertial body according to vehicle acceleration, comprising: a sensor bracket that supports the inertial body and is swingably supported by the vehicle; and an inertial force of the inertial body. An acceleration sensor for a vehicle, comprising: an output member driven by movement; and a forced drive member that is attached to the sensor bracket and drives the output member when a tilt amount of the vehicle reaches a predetermined value. apparatus. 2. The acceleration sensor device for a vehicle according to claim 1, wherein the forced drive member is a protrusion integrally projected from the sensor bracket. 3. A sensor housing to which the sensor bracket is swingably mounted is supported by a seat back of a reclining seat and tilted by a reclining operation,
The vehicle acceleration sensor device according to claim 1, wherein a forced drive member is attached to the sensor housing.