JP5775365B2 - Mounting structure of vehicle sensor for seat belt retractor - Google Patents

Description

The present invention relates to a mounting portion structure of a vehicle sensor for a seat belt retractor provided in a vehicle such as an automobile.

A seat belt retractor installed in a vehicle such as an automobile stops (locks) the withdrawal of a webbing (belt) when a vehicle sensor detects a change in vehicle speed at the time of a collision or the like (Patent Document 1). reference).

FIG. 20 shows a vehicle sensor (vehicle sensor for seat belt retractor) 100 attached to the seat belt retractor.

As shown in FIG. 20 , in the vehicle sensor 100, the sensor weight (metal spherical mass) 101 is rested in the sensor holder 102 when the vehicle is in a normal state (when stopped or when there is no sudden speed change). It is held in the position (sensor weight holding hole) 103 and does not operate.

On the other hand, as shown in FIG. 21, when the vehicle traveling speed changes suddenly due to a vehicle collision or the like and the acceleration acting on the sensor weight 101 exceeds a predetermined value, the vehicle sensor 100 causes the sensor weight 101 to move to the sensor holder due to inertia. The sensor weight 101 pushes up (rotates) the sensor lever 104 by moving out of the rest position 103 in the sensor 102 and moving in the sensor holder 102, and the claw 105 formed at the tip of the sensor lever 104 is used as the webbing take-up drum. It is made to bite between the teeth 107 of the attached gear 106. At this time (when the vehicle sensor is activated), the sensor lever 104 of the vehicle sensor 100 is attached to the vehicle sensor 100 when the webbing is pulled in the pulling direction and further rotated by the gear 106 attached to the webbing take-up drum. Further, the lever 108 is pressed against the lever stopper 110 of the case 108 of the seat belt retractor, and the deformation of the sensor lever 104 is prevented by the lever stopper 110. As a result, the vehicle sensor 100 can lock the rotation of the gear 106 in the webbing pull-out direction and can start the webbing take-up drum lock (webbing lock).

Further, the vehicle sensor 100 is configured such that the tip of the sensor lever 104 collides with the lever stopper 110 when the sensor lever 104 is lifted by the sensor weight 101 when the vehicle vibrates or there is a sudden change in posture of the vehicle. Therefore, the rotation is restricted.

However, in recent years, the quietness of the passenger compartment of an automobile has progressed, and the collision sound between the sensor lever 104 and the lever stopper 110 has become easier to be sensed by the seat belt wearer, resulting in the collision sound between the sensor lever 104 and the lever stopper 110. Reduction of vehicle interior noise is an issue.

In order to solve such a problem, as disclosed in Patent Document 2, the sensor lever 1
It is conceivable that the surface of 04 is covered with an elastomer, and the impact at the time of collision between the sensor lever 104 and the lever stopper 110 is eased with the elastomer, and noise during operation of the vehicle sensor 100 is reduced.

JP 2003-212086 A Japanese Patent Laid-Open No. 7-101311

However, the contact position between the tip of the sensor lever 104 and the lever stopper 110 is away from the rotation center of the sensor lever, and the tip of the sensor lever 104 is at the lever stopper 110.
The collision noise between the sensor lever 104 and the lever stopper 110 could not be sufficiently reduced.

Accordingly, an object of the present invention is to allow the sensor lever to be restricted without causing the sensor lever and the lever stopper to collide, and to sufficiently reduce the vehicle interior noise when the vehicle sensor is operated. .

(1) As shown in FIG. 1 to FIG.
When the sensor weight 11 accommodated in the sensor holder 10 made of synthetic resin moves in the sensor holder 10 due to inertia, the sensor lever 7 made of synthetic resin that is rotatably supported by the sensor holder 10 moves to the sensor weight. 11, the claw 8 of the sensor lever 7 bites between the teeth 6 and 6 of the gear 5 attached to the webbing take-up drum, and rotates the gear 5 in the webbing pull-out direction. A vehicle sensor 1 for a seat belt retractor to be regulated;
A synthetic resin case 3 in which the webbing take-up drum is rotatably supported and the seatbelt retractor vehicle sensor 1 is attached;
It is related with the attachment part structure of the vehicle sensor 1 for seatbelt retractors provided with these.

In the present invention, the case 3 is
When the sensor lever 7 is rotated by the sensor weight 11 until the claw 8 of the sensor lever 7 bites between the teeth 6 and 6 of the gear 5, the sensor lever 7 comes into contact with the sensor lever 7. Elastically deformable cantilever-like pieces 53, 54, 56 that restrict the rotation of 7;
And a lever stopper 42 positioned so that a gap δ1 is generated between the sensor lever 7 and the sensor lever 7 whose rotation is restricted by the cantilevered elastic pieces 53, 54 , 56.

The cantilever-like elastic pieces 53, 54, and 56 are configured such that, after the sensor lever 7 comes into contact with the elastic levers 53, 54, and 56, The sensor lever 7 is bent and deformed so that the sensor lever 7 can rotate by the gap δ1 and abut against the lever stopper 42.

The distance from the rotation center 47 of the sensor lever 7 to the contact position P1 of the sensor lever 7 and the cantilevered elastic pieces 53, 54 , 56 is L1, and the rotation center of the sensor lever 7 When the distance from 47 to the contact position P2 between the sensor lever 7 and the lever stopper 42 is L2, L1 <L2.
(2) In addition, as shown in FIGS.
When the sensor weight 11 accommodated in the sensor holder 10 made of synthetic resin moves in the sensor holder 10 due to inertia, the sensor lever 7 made of synthetic resin that is rotatably supported by the sensor holder 10 moves to the sensor weight. 11, the claw 8 of the sensor lever 7 bites between the teeth 6 and 6 of the gear 5 attached to the webbing take-up drum, and rotates the gear 5 in the webbing pull-out direction. A vehicle sensor 1 for a seat belt retractor to be regulated;
A synthetic resin case 3 in which the webbing take-up drum is rotatably supported and the seatbelt retractor vehicle sensor 1 is attached;
It is related with the attachment part structure of the vehicle sensor 1 for seatbelt retractors provided with these.

In the present invention, the case 3 includes the vehicle sensor 1 for the seat belt retractor.
A sensor housing chamber 4 for attaching the vehicle, and the seat belt retractor vehicle sensor 1.
And a lid 64 for closing the opening 51 is attached to the sensor housing chamber 4 along the rotational axis of the gear 5.

The lid 64 has a cantilever-like elastic piece 63 formed or fixed on an inner wall surface 65 located on the sensor housing chamber 4 side when the opening 51 is closed.

The elastic piece 63 projects into the sensor housing chamber 4 when the opening 51 is closed with the lid 64, and the claw 8 of the sensor lever 7 is located between the teeth 6 and 6 of the gear 5. When the sensor lever 7 is rotated by the sensor weight 11 until it bites in, the rotation of the sensor lever 7 is restricted by coming into contact with the sensor lever 7.

In addition, the sensor lever 7, which is a wall of the case 3 that forms the sensor housing chamber 4 and is positioned above the sensor housing chamber 4, is restricted by the elastic piece 63. The lever stopper 42 is positioned so that a gap is formed between them.

Further, after the sensor lever 7 comes into contact with the elastic piece 63, when a force in the direction of rotating the sensor lever 7 further acts on the sensor lever 7 via the gear 5, the elastic piece 63 is The sensor lever 7 is elastically deformed by the sensor lever 7, and the sensor lever 7 is rotated by the gap so as to come into contact with the lever stopper 42.

Further, the distance from the rotation center 47 of the sensor lever 7 to the contact position of the sensor lever 7 and the elastic piece 63 is L1, and the sensor lever 7 and the lever stopper from the rotation center 47 of the sensor lever 7 are set to L1. When the distance to the contact position of L is L2, L1 <L2.

According to the present invention, the cantilevered elastic piece formed or fixed to the case is caused to collide with a portion of the sensor lever close to the rotation center, and the cantilevered elastic piece is elastically deformed. Since the impact at the time of collision of the sensor lever is absorbed and the portion of the sensor lever far from the rotational axis is prevented from colliding with the lever stopper, the vehicle interior noise during the operation of the vehicle sensor can be suppressed.

Further, according to the present invention, the elastic piece formed or fixed to the lid for closing the opening of the sensor housing chamber of the case is caused to collide with a portion near the rotation center of the sensor lever, and the elastic piece is elastically deformed. As a result, the shock at the time of collision of the sensor lever is absorbed, and the portion of the sensor lever far from the rotational axis is prevented from colliding with the lever stopper, so that the vehicle interior noise during operation of the vehicle sensor can be suppressed. .

1 is a partial cross-sectional view of a seat belt retractor showing a mounting portion structure of a vehicle sensor for a seat belt retractor according to a first embodiment of the present invention. FIG. 2A is a front view of a vehicle sensor in a normal state of the vehicle (when stopped or when there is no sudden speed change), FIG. 2A is an assembly state diagram of the vehicle sensor, and FIG. 2B is a vehicle sensor. FIG. FIG. 3A is a longitudinal sectional view of the vehicle sensor 1 shown in FIG. 2, FIG. 3A is a longitudinal sectional view in an assembled state of the vehicle sensor, and FIG. 3B is a longitudinal sectional view when the vehicle sensor is disassembled. is there. 4A and 4B are diagrams showing a sensor holder of a vehicle sensor, in which FIG. 4A is a front view of the sensor holder, FIG. 4B is a left side view of the sensor holder, and FIG. 4C is a rear view of the sensor holder. 4 (d) is a plan view of the sensor holder, and FIG. 4 (e) is a back (bottom) view of the sensor holder. It is a longitudinal cross-sectional view of a sensor holder, and is a cross-sectional view of the sensor holder cut along the line A1-A1 of FIG. FIG. 6A is a longitudinal sectional view of the vehicle sensor showing the first operating state, and FIG. 6B is a longitudinal sectional view of the vehicle sensor showing the second operating state. 7A and 7B are diagrams illustrating a sensor lever of a vehicle sensor, in which FIG. 7A is a rear view of the sensor lever, FIG. 7B is a plan view of the sensor lever, and FIG. 7C is orthogonal to the lower surface side of the sensor weight holder. FIG. 7 (d) is a left side view of the sensor lever shown in FIG. 7 (a), and FIG. 7 (e) is a sensor shown in FIG. 7 (a). It is a right view of a lever. FIG. 8A is a front view of the sensor lever, and FIG. 8B is a longitudinal sectional view of the sensor lever shown in FIG. It is a partial cross section figure of a seatbelt retractor which shows the 1st operation state of a vehicle sensor. It is a figure which shows a lever stopper and an elastic piece. 10A is a front view of the lever stopper and the elastic piece, FIG. 10B is a plan view of the lever stopper, and FIG. 10C is a right side view of the lever stopper and the elastic piece (right side of FIG. 10A). FIG. 10D is a rear view of the lever stopper and the elastic piece. It is a partial cross section figure of the seatbelt retractor which shows the 2nd operation state of a vehicle sensor. It is a figure which shows the modification of an elastic piece, and is a figure corresponding to FIG. It is a figure for demonstrating the attachment part structure of the vehicle sensor which concerns on 2nd Embodiment of this invention. FIG. 13A is a view of the vehicle sensor mounting portion structure showing a state in which the cover of the sensor housing chamber of the case is opened. FIG.13 (b) is sectional drawing cut | disconnected and shown along the A2-A2 line | wire of Fig.13 (a). FIGS. 13C to 13F are diagrams illustrating examples of the cross-sectional shape of the elastic piece. It is a figure for demonstrating the attachment part structure of the vehicle sensor which concerns on 2nd Embodiment of this invention. FIG. 14A is a diagram of the vehicle sensor mounting portion structure showing a state in which the lid of the case sensor housing chamber is closed. Moreover, FIG.14 (b) is sectional drawing cut | disconnected and shown along the A3-A3 line | wire of Fig.14 (a). It is a figure for demonstrating the attachment part structure of the vehicle sensor which concerns on 3rd Embodiment of this invention (The modification of the attachment part structure of the vehicle sensor which concerns on the said 2nd Embodiment). FIG. 15A is a diagram of a vehicle sensor mounting portion structure showing a state in which the cover of the sensor housing chamber of the case is opened. FIG. 15B is a cross-sectional view taken along the line A4-A4 of FIG. It is a figure for demonstrating the attachment part structure of the vehicle sensor which concerns on 3rd Embodiment of this invention (The modification of the attachment part structure of the vehicle sensor which concerns on the said 2nd Embodiment). FIG. 16A is a view of the vehicle sensor mounting portion structure showing a state in which the lid of the case sensor housing chamber is closed. FIG. 16B is a cross-sectional view taken along line A5-A5 of FIG. It is a figure for demonstrating the attachment part structure of the vehicle sensor which concerns on 4th Embodiment of this invention (The modification of the attachment part structure of the vehicle sensor which concerns on the said 3rd Embodiment), and covers the sensor storage chamber cover of a case It is a figure of the attachment part structure of the vehicle sensor 1 which shows the removed state. It is a figure of the lid attached to the opening part of the sensor storage chamber of the case shown in FIG. It is a figure for demonstrating the attachment part structure of the vehicle sensor which concerns on 4th Embodiment of this invention (modified example of the attachment part structure of the vehicle sensor which concerns on the said 3rd Embodiment), and the opening part of the sensor storage chamber of a case It is a figure of the attachment part structure of the vehicle sensor which shows the state which attached the lid | cover to. It is a partial sectional view of a seat belt retractor showing a mounting part structure of a conventional vehicle sensor for a seat belt retractor, and shows a state before the vehicle sensor is activated. It is a partial sectional view of a seat belt retractor showing a mounting part structure of a conventional vehicle sensor for a seat belt retractor, and shows a state when the vehicle sensor is activated.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
FIG. 1 is a view for explaining an attachment portion structure of a vehicle sensor 1 for a seat belt retractor (hereinafter abbreviated as a vehicle sensor) according to a first embodiment of the present invention.

As shown in FIG. 1, a vehicle sensor 1 is mounted in a sensor housing chamber 4 of a case 3 that rotatably supports a rotating shaft 2 of a webbing take-up drum. When the vehicle sensor 1 detects an abrupt speed change of the vehicle such as when the vehicle collides, the sensor lever 7 is interposed between the teeth 6 and 6 of the gear 5 that is coaxially mounted with the rotary shaft 2 of the webbing take-up drum. The claw 8 is bitten to prevent the gear 5 from rotating in the webbing pull-out direction, and the webbing take-up drum (not shown) can be started with a lock mechanism (webbing lock mechanism). The claw 8 and the gear 5 of the sensor lever 7 constitute a ratchet mechanism.

(Overall configuration of vehicle sensor)
2 to 3 are diagrams showing the vehicle sensor 1. Of these, FIG. 2 is a front view of the vehicle sensor 1 during normal operation of the vehicle (when stopped or when there is no sudden speed change).
FIG. 2A is an assembly state diagram of the vehicle sensor 1, and FIG. 2B is an exploded view of the vehicle sensor 1. 3 is a longitudinal sectional view of the vehicle sensor 1 shown in FIG.
FIG. 3A is a longitudinal sectional view of the vehicle sensor 1 in an assembled state, and FIG. 3B is a longitudinal sectional view of the vehicle sensor 1 when disassembled.

As shown in these drawings, the vehicle sensor 1 includes a sensor holder 10 made of a synthetic resin, a sensor weight 11 made of metal contained in the sensor holder 10 and formed in a spherical shape, and one end of the sensor holder 10. The sensor lever 7 is made of synthetic resin and is mounted on the sensor weight 11 so as to be swingable.

(Sensor holder for vehicle sensor)
As shown in FIGS. 2 to 5, the sensor holder 10 includes a bottomed sensor weight receiving recess 12 that opens upward (in the direction along the Z axis), and both side surfaces 13 on one end side of the sensor lever 7.
A pair of support legs 17 and 18 that rotatably support the support shafts 15 and 16 projecting from 14,
(See FIGS. 7 to 8).

The sensor weight housing recess 12 is formed with a bottom surface 20 which is a flat surface parallel to the XY direction and has a circular shape in plan view, and is tapered to seat the sensor weight 11 in the center of the bottom surface 20. And a through hole 22 having a smaller diameter than the opening edge on the bottom surface side of the countersink surface 21 and concentric with the countersink surface 21 communicates the internal space of the sensor weight housing recess 12 with the external space. It is formed as follows. A countersink surface side opening edge 23 of the through hole 22 formed in the sensor weight housing recess 12 holds the sensor weight 11 in the center of the sensor weight housing recess 12. Also, the sensor weight housing recess 1
The counterweight-side opening edge 23 of the through hole 22 formed in the sensor weight 11 holds the sensor weight 11 in the center of the sensor weight receiving recess 12 until the inertial force acting on the sensor weight 11 becomes a predetermined value or more. It has become a rest position. Therefore, the sensor weight 11
Does not move away from the center (rest position) of the sensor weight housing recess 12 and does not move in the sensor weight housing recess 12 during normal times of the vehicle (see FIG. 3A).

The sensor weight housing recess 12 has a substantially tapered tapered side wall surface 25 extending from the upper surface 24 of the sensor holder 10 formed so as to be parallel to the bottom surface 20 along the Z-axis (a direction perpendicular to the bottom surface 20). It is connected to the bottom surface 20 via a shaped corner surface 26. The internal space of the sensor weight housing recess 12 is formed by the bottom surface 20, the countersink surface 21, the corner surface 26, and the side wall surface 25. Here, the side wall surface 25 has a bottom surface 20 having a shape in plan view.
Are formed so as to be concentric with each other, and are formed so as to form a gap at an equal interval between the sensor weight 11 and the sensor weight 11 held in the center of the sensor weight receiving recess 12. The sensor weight 11 can move in the sensor weight housing recess 12 by the gap. Further, the corner surface 26 is formed so as not to contact the sensor weight 11.

The pair of support legs 17 and 18 are formed so as to protrude from the upper surface 24 of the sensor holder 10 in the Z-axis direction (upward), and accommodate the support shafts 15 and 16 of the sensor lever 7 in a swingable manner. Shaft holes 27 and 28 are formed (see FIG. 7). The pair of support legs 17, 18
When the support shafts 15 and 16 of the sensor lever 7 are fitted into the shaft holes 27 and 28, the support shafts 15 and 16 of the sensor lever 7 can be bent and deformed in directions away from each other. 2
After being fitted to 7, 28, the original posture is elastically restored (see FIG. 7). As a result, the support shafts 15 and 16 of the sensor lever 7 are connected to the shaft holes 27 and 28 of the pair of support legs 17 and 18.
Without swinging out, the shaft holes 27 and 28 of the pair of support legs 17 and 18 are supported so as to be swingable. The pair of support legs 17 and 18 are formed such that one support leg 18 is longer in the Z-axis direction than the other support leg 17 and is easily deformed. One support leg 1
8 has an inclined surface 30 on the upper end side and the side facing the other support leg 17, and the support shaft 16 of the sensor lever 7 is simply moved along the inclined surface 30 (the other support leg It is devised so that the support shafts 15 and 16 of the sensor lever 7 and the shaft holes 27 and 28 can be easily engaged with each other by simply being pushed between them. The shaft hole 28 of one support leg 18 and the shaft hole 27 of the other support leg 17 have the same size (hole diameter) as the thickness (axis diameter) of the support shafts 16 and 15 of the sensor lever 7. The sensor lever 7 is devised so that the sensor lever 7 can be assembled to the sensor holder 10 in a correct posture.

Further, the sensor holder 10 has positioning projections 33 and 34 formed on both side surfaces 31 and 32 thereof. The positioning projections 33 and 34 are engaged with positioning recesses 35 and 36 as guide rails formed in the sensor housing chamber 4 of the case 3 (see FIG. 1).
When the vehicle sensor 1 is mounted in the sensor housing chamber 4 with the positioning protrusions 33 and 34 of the sensor holder 10 engaged with the positioning recesses 35 and 36 of the sensor housing chamber 4, It will be hold | maintained in the sensor storage chamber 4 in the positioned state (refer FIG. 1).

Further, the sensor holder 10 prevents the sensor weight 11 from coming out of the gap with the sensor lever 7 even if the sensor holder 10 rotates as much as possible until the rotation stopper 37 of the sensor lever 7 contacts the upper surface 24. The depth of the housing recess 12 is determined (see FIG. 6).

(Sensor lever of vehicle sensor)
As shown in FIGS. 7 to 8, the sensor lever 7 is fitted on both side surfaces 13 and 14 on one end side so as to be swingable in the shaft holes 27 and 28 of the support leg portions 17 and 18 of the sensor holder 10. Support shaft 1
5 and 16 are formed (see FIGS. 2 and 4). Further, on the other end side of the sensor lever 7, a sensor weight holder 38 that is placed on the sensor weight 11 accommodated in the sensor holder 10 is formed. A sensor weight housing surface (concave surface) 40 having a substantially frustoconical shape is formed on the lower surface side of the sensor weight holder 38, and the sensor weight housing surface 4
0 comes into contact with the surface of the sensor weight 11 (see FIGS. 3 and 6). Also,
The sensor lever 7 has a claw 8 protruding from the upper surface on the other end side, the tip side of the claw 8 is formed at an acute angle, and the tip side of the claw 8 is bitten between the teeth 6 and 6 of the gear 5. (See FIG. 1). The claw 8 of the sensor lever 7 has a width dimension smaller than the width dimension of the arm part 41 connecting the sensor weight presser 38 and the support shafts 15 and 16.
It is formed in a tongue shape (in particular, see FIGS. 7A to 7C).

In addition, a rotation stopper 37 is formed to protrude from the lower surface on one end side of the sensor lever 7.
The rotation stopper 37 of the sensor lever 7 is provided with a case 3 as shown in FIGS.
When the sensor lever 7 is rotated so as to be lifted against its own weight in a state before being housed in the sensor housing chamber 4 (for example, when the vehicle sensor 1 is being transported or handled), the sensor holder 10 The sensor lever 11 is in contact with the upper surface 24 to prevent the sensor lever 7 from rotating (counterclockwise in FIG. 6), and the sensor weight 11 is attached to the upper surface 24 of the sensor holder 10.
And the sensor lever 7 are prevented from coming out of the gap.

(Case)
As shown in FIGS. 1 and 9, the case 3 made of synthetic resin has a wall surface 50 on its front side.
Is formed in a substantially rectangular shape along the axis of the rotary shaft 2 of the webbing take-up drum, and the gear 5 is mounted coaxially with the rotary shaft 2 of the webbing take-up drum. Is formed so as to be adjacent to the sensor housing chamber 4. Further, the case 3 opens the sensor housing chamber 4 to the front side of the case 3 in order to insert the vehicle sensor 1 into the sensor housing chamber 4 along the axis of the rotating shaft 2 (the rotating shaft of the gear 5). An opening 51 is formed. A window 44 that connects the inside of the sensor housing chamber 4 and the inside of the gear housing chamber 43 is formed at the upper right side of the sensor housing chamber 4 in the drawing. The window 44 allows the claw 8 of the sensor lever 7 of the vehicle sensor 1 mounted in the sensor housing chamber 4 to protrude to a position where it can bite between the teeth 6 and 6 of the gear 5.

Further, as shown in FIGS. 1, 9 and 10, a window 44 is provided on the upper wall 52 which is one of the walls forming the sensor housing chamber 4 of the case 3 and located at the upper portion of the sensor housing chamber 4. A synthetic resin lever stopper 42 forming one of the opening edges (the left opening edge of the pair of left and right opening edges in FIG. 1) is integrally formed.

Further, as shown in FIGS. 1, 9, and 10, the upper wall 52 of the sensor housing chamber 4 of the case 3 has a cantilevered elastic piece (elastically deforming portion) 53 protruding into the sensor housing chamber 4. Are integrally formed. The elastic piece 53 can be bent and deformed (elastically deformed), protrudes obliquely downward to the right from the upper wall 52, and is rounded into an arc shape so that the distal end has a downward convex shape.
The elastic piece 53 has the sensor lever 7 lifted (rotated counterclockwise in FIGS. 1 and 9) by the sensor weight 11 moving in the sensor weight housing recess 12 of the sensor holder 10, and the sensor piece 7 When the claw 8 of the lever 7 is rotated to a position where the claw 8 bites between the teeth 6 and 6 of the gear 5, the lower surface on the tip side rounded in an arc shape comes into contact with the upper surface of the sensor lever 7. When the elastic piece 53 comes into contact with the sensor lever 7, a gap (δ1) is generated between the sensor lever 7 and the lever stopper 42, and the rotation stopper 37 of the sensor lever 7 and the upper surface 24 of the sensor holder 10 are separated. The elastic piece 53, the lever stopper 42, the sensor holder 10, and the sensor lever 7 are formed so that a gap (δ2 (where δ2 ≧ δ1)) is generated therebetween. Then, when the elastic piece 53 is further rotated (rotated in the direction lifted by the vibration motion of the sensor weight 11) after the sensor lever 7 comes into contact with the elastic piece 53, an elastic deformation force is applied to the sensor lever 7. Thus, the sensor lever 7 is restricted in a direction that prevents the rotation of the sensor lever 7. As a result, the sensor holder 1
Even if inertial force due to vehicle vibration or the like acts on the sensor weight 11 accommodated in the zero sensor weight accommodating recess 12, the elastic force of the elastic piece 53 acts on the sensor weight 11 via the sensor lever 7. In addition, the vibration of the sensor weight 11 in the sensor weight housing recess 12 of the sensor holder 10 is suppressed, and the occurrence of collision noise between the sensor weight 11 and the sensor holder 10 is suppressed. The elastic piece 53 can elastically deform and absorb the kinetic energy of the sensor lever 7 and the sensor weight 11 even if it collides with the sensor lever 7 lifted by the sensor weight 11. Generation of collision noise can be suppressed. As shown in FIG. 10, the elastic piece 53 is the same as the length in the width direction of the lever stopper 42 along the width direction (Y-axis direction) of the lever stopper 42 (along one of the opening edges of the window 44). However, the present invention is not limited to this, and considering the elastic deformation force, it is formed to have a width direction length shorter than the width direction length of the lever stopper 42. Also good.

As shown in FIGS. 9 and 11, the elastic piece 53 is rotated by the gap (δ1) (rotated counterclockwise in FIG. 9) after the sensor lever 7 comes into contact. The claw 8 of the sensor lever 7 is elastically deformed until it comes into contact with the lever stopper 42.

As shown in FIG. 11, the lever stopper 42 is pressed by the teeth 6 of the gear 5 that rotates in the webbing pull-out direction, and the sensor lever 7 is pressed against the elastic piece 53. When 53 is bent and deformed and rotated, it comes into contact with the claw 8 of the sensor lever 7 and prevents rotation of the sensor lever 7 (counterclockwise rotation in FIG. 11). 6, the claw 8 of the sensor lever 7 is clamped (locked) with the tooth 6 of the gear 5.

Here, the contact position P between the sensor lever 7 and the elastic piece 53 from the rotation center 47 of the sensor lever 7.
1 to L1, and the claw 8 and lever stopper 42 from the rotation center 47 of the sensor lever 7
When the distance to the contact position P2 is L2, the case 3 and the vehicle sensor 1 are formed so that L1 <L2. As a result, the impact force at the time of collision between the sensor lever 7 and the elastic piece 53 is such that the speed when the sensor lever 7 swings at the contact position P1 between the sensor lever 7 and the elastic piece 53 is Therefore, the impact force at the time of the collision between the sensor lever 7 and the lever stopper 42 can be made smaller. That is, according to the present embodiment, it is possible to more effectively suppress the operation sound of the vehicle sensor 1 compared to the case where a collision buffering device is applied to the contact portion between the sensor lever 7 and the lever stopper 42. Become.

(Vehicle sensor operation)
As shown in FIG. 3 (a), the vehicle sensor 1 is configured so that the sensor weight 11 is in a rest position (sensor weight holding hole) in the sensor holder 10 when the vehicle is in a normal state (when stopped or when there is no sudden speed change). A through hole 22 that functions as an opening edge 2 on the countersink surface side of the through hole 22.
3) is held and does not operate.

On the other hand, as shown in FIGS. 1 and 9, the vehicle sensor 1 is configured such that when the vehicle traveling speed changes suddenly due to a vehicle collision or the like and the acceleration acting on the sensor weight 11 exceeds a predetermined value, the sensor weight 11 Accordingly, the sensor weight 10 moves from the rest position 23 in the sensor weight housing recess 12, and the sensor weight 11 moves in the sensor weight housing recess 12 while pushing up (rotating) the sensor lever 7.

When the sensor lever 7 collides with the elastic piece 53 of the case 3, the vehicle sensor 1 can absorb the kinetic energy of the sensor lever 7 by elastic deformation of the elastic piece 52. The collision sound can be suppressed (see FIG. 9).

Further, when the vehicle sensor 1 is rotated to a position where the sensor lever 7 comes into contact with the elastic piece 53, the claw 8 of the sensor lever 7 lifted by the sensor weight 11 has teeth 6 of the gear 5 attached to the webbing take-up drum. , 6 (see FIGS. 1 and 9). When the force in the webbing pull-out direction (the force in the direction of lifting the claw 8 of the sensor lever 7) acts on the sensor lever 7 via the gear 5, the vehicle sensor 1 deflects and deforms the elastic piece 53 (elasticity). The sensor lever 7 is rotated until it abuts against the lever stopper 42, the claw 8 of the sensor lever 7 is clamped (locked) by the claw 6 of the gear 5 and the lever stopper 42, and the webbing pull-out direction of the gear 5 is Can be prevented by the sensor lever 7 (see FIG. 11). As a result, the vehicle sensor 1 can start a webbing take-up drum locking mechanism (webbing locking mechanism).

1, 6, 9, and 11, when the inertial force is not applied to the sensor weight 11, the sensor lever 7 is moved in the webbing rewind direction by a spring outside the figure. It is pressed by the rotationally biased gear 5 to rotate in a direction to reduce the swing angle, and is rotated in a direction to reduce the swing angle by its own weight or the elastic force of the elastic piece 53 . As a result, the sensor weight 11 is pushed by the sensor lever 7 and returned to the repose position 23 in the sensor holder 10 (see FIG. 3A).

(Effect of this embodiment)
According to the mounting portion structure of the vehicle sensor 1 for a seat belt retractor according to the present embodiment,
The sensor lever 7 is not directly collided with the lever stopper 42, the sensor lever 7 is collided with the elastic piece 53 of the case 3, and the sensor lever 7 is rotated from the rotation center 47 of the sensor lever 7. 7 and the contact position P1 of the elastic piece 53 is shorter than the distance L2 from the rotation center 47 of the sensor lever 7 to the contact position P2 of the sensor lever 7 and the lever stopper 42. Compared with the case where the lever 7 is brought into contact with the lever stopper 42, the speed when the sensor lever 7 collides with the elastic piece 53 can be reduced.
Noise during operation of the vehicle sensor 1 can be suppressed.

Further, according to the attachment structure of the seat belt retractor vehicle sensor 1 according to the present embodiment, even if the elastic piece 53 collides with the sensor lever 7 lifted by the sensor weight 11, the sensor lever 7 and the sensor weight 11. The kinetic energy can be elastically deformed and absorbed, so that the impact at the time of the collision with the sensor lever 7 can be absorbed, and the generation of the collision sound at the time of the collision with the sensor lever 7 can be suppressed.

Further, according to the mounting structure of the seatbelt retractor vehicle sensor 1 according to the present embodiment, an inertial force due to vehicle vibration or the like acts on the sensor weight 11 in the sensor weight housing recess 12 of the sensor holder 10, and the sensor When the weight 11 swings the sensor lever 7 and vibrates in the sensor weight housing recess 12, the elastic force of the elastic piece 53 acts on the sensor weight 11 via the sensor lever 7, and the sensor weight in the sensor weight housing recess 12. 1
1 is suppressed, and the occurrence of collision noise between the sensor weight 11 and the sensor holder 10 is suppressed.

Further, according to the attachment structure of the seatbelt retractor vehicle sensor 1 according to the present embodiment, when the sensor lever 7 comes into contact with the elastic piece 53, the sensor lever 7 and the lever stopper 4.
2 is formed between the rotation stopper 37 of the sensor lever 7 and the sensor holder 10.
A gap (δ2 (where δ2 ≧ δ1)) is formed between the upper surface 24 and the rotation stopper 37 of the sensor lever 7 before the claw 8 of the sensor lever 7 contacts the lever stopper 42. Does not come into contact with the upper surface 24 of the sensor holder 10, so that an excessive load does not act on the support shafts 15, 16 as the rotation fulcrum of the sensor lever 7, resulting from uneven wear of the support shafts 15, 16. The malfunction of the vehicle sensor 1 does not occur.

(Modification)
FIG. 12 shows a modification of the elastic piece (elastic deformation portion) 53 of the case 3 according to the first embodiment. The elastic piece (elastically deforming portion) 54 of this modified example protrudes from the upper wall 52 (the lower surface of the lever stopper 42) of the sensor housing chamber 4 of the case 3 into the sensor housing chamber 4 in the diagonally downward left direction in the figure. The elastic piece 53 of the first embodiment is formed so as to protrude from the upper wall 52 of the sensor housing chamber 4 of the case 3 into the sensor housing chamber 4 in a diagonally downward right direction in the figure. Although it differs from this, it functions similarly to the elastic piece 53 of 1st Embodiment.

(Other variations)
The elastic pieces 53 and 54 may be formed separately from the case 3 and fixed to the upper wall 52 with an adhesive or the like. Further, the elastic pieces 53 and 54 are not limited to a thin plate shape, and may be a round bar shape or a square bar shape. In addition, the elastic pieces 53 and 54 are not limited to the case where the elastic pieces 53 and 54 are formed of the same synthetic resin as the case 3, but a material different from the case 3 (for example, a flexible grade polyacetal or polyester which is a synthetic resin softer than the synthetic resin of the case 3 (Elastomer).

[Second Embodiment]
FIGS. 13 to 14 are views for explaining the structure of the mounting portion of the vehicle sensor 1 according to the second embodiment of the present invention. Among these, FIG. 13A shows the lid 55 of the sensor housing chamber 4 of the case 3.
It is a figure of the attachment part structure of the vehicle sensor 1 which shows the state which opened. In addition, FIG.
It is sectional drawing cut | disconnected and shown along the A2-A2 line | wire of Fig.13 (a), and is a figure for demonstrating the relationship between the sensor lever 7, the elastic piece 56, and the lever stopper 42. FIG. In addition, FIG.
(F) is a diagram showing an example of a cross-sectional shape of the elastic piece 56. FIG. 14A shows case 3.
It is a figure of the attachment part structure of the vehicle sensor 1 which shows the state which closed the lid | cover 55 of the sensor storage chamber 4 of this. Moreover, FIG.14 (b) is sectional drawing cut | disconnected and shown along the A3-A3 line | wire of Fig.14 (a). In addition, in the attachment part structure of the vehicle sensor 1 according to the present embodiment shown in FIGS. 13 to 14, the same reference numerals are given to the parts corresponding to the attachment part structure of the vehicle sensor 1 shown in FIGS. The description overlapping with the description of the mounting portion structure of the vehicle sensor 1 according to the first embodiment will be omitted.

As shown in these drawings, the case 3 according to this embodiment includes an opening 51 of the sensor housing chamber 4.
A lid 55 for opening and closing the opening 51 of the sensor storage chamber 4 is integrally formed on the lower end side of the sensor via a hinge portion 57. The case 3 is one of the walls forming the sensor housing chamber 4, and protrudes into the sensor housing chamber 4 at a vertical wall 58 located in the back of the sensor housing chamber 4 so as to face the opening 51. A cantilever-like elastic piece (elastic deformation portion) 56 is integrally formed. The elastic piece 56 is formed in an elongated thin plate shape, and is formed in an arc shape in which a lower surface side contacting the sensor lever 7 protrudes toward the sensor lever 7 (see FIG. 13C). And this elastic piece 56 contact | abuts to the sensor lever 7 in the same position as the elastic piece 53 of 1st Embodiment, and functions similarly to the elastic piece 53 of 1st Embodiment. As a result, the attachment portion structure of the vehicle sensor 1 according to the present embodiment can obtain the same effects as the attachment portion structure of the vehicle sensor 1 according to the first embodiment.

The elastic piece 56 may be formed separately from the case 3 and fixed to the vertical wall 58 with an adhesive or the like. The elastic piece 56 is not limited to a thin plate shape, and may be a round bar shape or a square bar shape. The lid 55 is integrally formed with an elastically deformable hook 61 that is hooked on the lower edge of the hole 60 formed on the front side of the upper wall 52 of the case 3 (see FIG. 14B). Also, the lid 55
The elastic piece 56 is not limited to the case of being formed of the same synthetic resin as that of the case 3, but is made of a material different from that of the case 3 (for example, a flexible grade polyacetal or polyester elastomer which is a synthetic resin softer than the synthetic resin of the case 3). You may make it form. Further, the lid 55 may be integrally formed on the left side of the opening 51 of the case 3 in FIG. Further, the elastic piece 56 has a cross-sectional shape in which the lower surface side has a downwardly convex arc shape (FIG. 10 (
c)), or when the cross-sectional shape has a triangular shape with the bottom surface convex downward (see FIG. 13D)
The contact position with the sensor lever 7 is stabilized. In addition, the elastic piece 56 has a cross-sectional shape or a trapezoidal shape whose bottom surface is convex downward as long as the position of contact with the sensor lever 7 is stable (FIG.
f), and other cross-sectional shapes may be employed.

[Third Embodiment]
FIGS. 15 to 16 are views for explaining a mounting portion structure of the vehicle sensor 1 according to the third embodiment of the present invention (modification example of the mounting portion structure of the vehicle sensor 1 according to the second embodiment). . Among these, FIG. 15A is a diagram of the mounting structure of the vehicle sensor 1 showing a state in which the lid 55 of the sensor housing chamber 4 of the case 3 is opened. FIG. 15B shows A4 in FIG.
It is sectional drawing cut | disconnected and shown along the -A4 line. FIG. 16A is a diagram of the attachment structure of the vehicle sensor 1 showing a state in which the lid 55 of the sensor housing chamber 4 of the case 3 is closed. Also,
FIG. 16B is a cross-sectional view taken along line A5-A5 of FIG. In addition, in the attachment structure of the vehicle sensor 1 according to the present embodiment shown in FIGS. 15 to 16, the same reference numerals are given to the portions corresponding to the attachment structure of the vehicle sensor 1 shown in FIGS. 1, 13 to 14. A description overlapping with the description of the mounting structure of the vehicle sensor 1 according to the first and second embodiments will be omitted.

As shown in these drawings, the lid 55 has a cantilever-like elastic piece (elastic) on the inner wall surface 62 that is located on the sensor housing chamber 4 side when the opening 51 of the sensor housing chamber 4 is closed. Deformation part) 63
Are integrally formed. The elastic piece 63 has the same shape as the elastic piece 56 of the second embodiment, and protrudes into the sensor housing chamber 4 when the opening 51 of the sensor housing chamber 4 is closed by the lid 55, so that the second embodiment It abuts on the sensor lever 7 at the same position as the elastic piece 56 and functions in the same manner as the elastic piece 56 of the second embodiment. As a result, the attachment part structure of the vehicle sensor 1 according to the present embodiment can obtain the same effects as the attachment part structure of the vehicle sensor 1 according to the first and second embodiments.

The elastic piece 63 may be formed separately from the lid 55 and fixed to the inner wall surface 62 of the lid 55 with an adhesive or the like. Further, the elastic piece 63 is not limited to a thin plate shape, and may be a round bar shape or a square bar shape. Further, the lid 55 and the elastic piece 63 are not limited to the case of being formed of the same synthetic resin as that of the case 3, but a material different from that of the case 3 (for example, a flexible grade polyacetal which is a synthetic resin softer than the synthetic resin of the case 3) (Polyester elastomer).

[Fourth Embodiment]
FIGS. 17 to 19 are views for explaining the attachment structure of the vehicle sensor 1 according to the fourth embodiment of the present invention (modified example of the attachment structure of the vehicle sensor 1 according to the third embodiment). . Among these, FIG. 17 is a view of the attachment structure of the vehicle sensor 1 showing a state in which the lid 64 of the sensor housing chamber 4 of the case 3 is removed. 18 is a view of the lid 64 attached to the opening 51 of the sensor housing chamber 4 of the case 3 shown in FIG. FIG. 19 is a view of the attachment portion structure of the vehicle sensor 1 showing a state where the lid 64 is attached to the opening 51 of the sensor housing chamber 4 of the case 3. In addition, in the attachment part structure of the vehicle sensor 1 according to the present embodiment shown in FIGS. 17 to 19, the same reference numerals are given to portions corresponding to the attachment part structure of the vehicle sensor 1 shown in FIGS. A description overlapping with the description of the mounting portion structure of the vehicle sensor 1 according to the third embodiment will be omitted.

The attachment structure of the vehicle sensor 1 according to the present embodiment shown in these drawings is such that the lid 64 is formed separately from the case 3 so that the opening 51 of the sensor storage chamber 4 can be opened and closed by the lid 64.
Is detachably attached to the case 3. That is, the lid 6 of this embodiment
4, the lid 55 of the third embodiment is formed integrally with the case 3, but after being formed separately from the case 3, the lid 55 is detachably attached to the case 3.
Different from the lid 55 of the third embodiment.

When the lid 64 of the present embodiment is attached to the case 3, it is the inner wall surface 65 that is positioned on the sensor housing chamber 4 side (facing the sensor housing chamber 4). The inner wall surface 6 of the lid 64
5, a first locking piece 66 is formed at one location on the upper edge side, and a second locking piece 67 and a third locking piece 68 are formed in the vicinity of the left and right corners on the lower edge side. . And the 1st-3rd latching pieces 66-68 of this lid | cover 64 are formed in the wall surface 50 of the front side of case 3 at the 1st-1st.
The lid 64 is detachably attached to the case 3 by being pushed into the third holes 70 to 72. In addition, the 1st-3rd locking pieces 66-68 have a shape which divided | segmented the round bar into 2 with the slit 73, as shown to FIG.18 (c)-(d), and the width | variety of the slit 73 It is elastically deformed so as to be narrowed, and is pushed into the first to third holes 70 to 72 of the case 3. As a result, the lid 64 is elastically held by the elastic force of the first to third locking pieces 66 to 68 that are elastically restored in the first to third holes 70 to 72.

In addition, when the lid 64 of the present embodiment is attached to the case 3, the cantilever-like elastic piece (elasticity) is formed on the inner wall surface 65 that is positioned on the sensor housing chamber 4 side (facing the sensor housing chamber 4). (Deformation part) 63 is integrally formed. This elastic piece 63 is the elastic piece 56 of the second and third embodiments.
, 63 is a thin plate having the same cross-sectional shape (for example, see FIGS. 13C to 13F), and protrudes into the sensor housing chamber 4 when the opening 51 of the sensor housing chamber 4 is closed by the lid 64. The elastic lever 63 contacts the sensor lever 7 at the same position as the elastic piece 63 of the third embodiment, and functions similarly to the elastic piece 63 of the third embodiment. As a result, the attachment part structure of the vehicle sensor 1 according to the present embodiment can obtain the same effects as the attachment part structure of the vehicle sensor 1 according to the first to third embodiments.

The elastic piece 63 may be formed separately from the lid 64 and fixed to the inner wall surface 65 of the lid 64 with an adhesive or the like. Further, the elastic piece 63 is not limited to a thin plate shape, and may be a round bar shape or a square bar shape. Further, the lid 65 and the elastic piece 63 are not limited to the case of being formed of the same synthetic resin as that of the case 3, and a material different from that of the case 3 (for example, a flexible grade polyacetal which is a synthetic resin softer than the synthetic resin of the case 3) (Polyester elastomer).

1 ... vehicle sensor, 3 ... case, 4 ... sensor housing, 5 ... gear, 6 ... tooth,
7: Sensor lever, 8: Claw, 10: Sensor holder, 11: Sensor weight, 42
…… Lever stopper, 47 …… Rotation center, 51 …… Open, 52 …… Upper wall, 53,54
, 56, 63... Elastic piece (elastic deformation portion), 64... Lid, 65.
Gap

Claims (4)

When the sensor weight housed in the synthetic resin sensor holder moves in the sensor holder due to inertia, the synthetic resin sensor lever rotatably supported by the sensor holder rotates in the direction lifted by the sensor weight. A vehicle sensor for a seat belt retractor that is moved so that the pawl of the sensor lever bites between the teeth of the gear attached to the webbing take-up drum and regulates the rotation of the gear in the webbing pull-out direction; ,
The webbing take-up drum is rotatably supported, and a synthetic resin case to which the seat belt retractor vehicle sensor is attached,
A mounting structure of a vehicle sensor for a seat belt retractor comprising:
・ The case is
When the sensor lever is rotated by the sensor weight until the claw of the sensor lever bites between the teeth of the gear, the sensor lever is brought into contact with the sensor lever and can be flexibly deformed to restrict the rotation of the sensor lever. A cantilevered elastic piece ,
A lever stopper that is positioned so as to create a gap between the sensor lever that is pivotally restricted by the cantilevered elastic piece ,
The cantilever-like elastic piece is rotated by an amount corresponding to the gap when a force in a direction of rotating the sensor lever is further applied via the gear after the sensor lever abuts. It is deformed so that it can move and come into contact with the lever stopper,
The distance from the rotation center of the sensor lever to the contact position between the sensor lever and the cantilevered elastic piece is L1, and the contact between the sensor lever and the lever stopper from the rotation center of the sensor lever When the distance to the position is L2, L1 <L2.
A mounting structure for a vehicle sensor for a seat belt retractor. The case is formed with a sensor storage chamber for mounting the vehicle sensor for the seat belt retractor.
The cantilever-like elastic piece is a wall that forms the sensor housing chamber of the case, and is formed or fixed to an upper wall that is located above the sensor housing chamber, and can be inclined from the upper wall. Projecting toward the top, rounded into a circular arc shape so that the tip is convex downward, and the tip is in contact with the upper surface of the sensor lever rotated by the sensor weight.
The mounting structure of a vehicle sensor for a seat belt retractor according to claim 1. The case includes a sensor storage chamber for mounting the vehicle sensor for the seat belt retractor, and an opening for inserting the vehicle sensor for the seat belt retractor into the sensor storage chamber along the rotation axis of the gear. Have
The cantilever-like elastic piece is a wall that forms the sensor housing chamber of the case, and is formed or fixed to a vertical wall that is located in the back of the sensor housing chamber so as to face the opening. It has been,
The mounting structure of a vehicle sensor for a seat belt retractor according to claim 1. When the sensor weight housed in the synthetic resin sensor holder moves in the sensor holder due to inertia, the synthetic resin sensor lever rotatably supported by the sensor holder rotates in the direction lifted by the sensor weight. A vehicle sensor for a seat belt retractor that is moved so that the pawl of the sensor lever bites between the teeth of the gear attached to the webbing take-up drum and regulates the rotation of the gear in the webbing pull-out direction; ,
The webbing take-up drum is rotatably supported, and a synthetic resin case to which the seat belt retractor vehicle sensor is attached,
A mounting structure of a vehicle sensor for a seat belt retractor comprising:
・ The case is
A sensor housing chamber for mounting the vehicle sensor for seat belt retractor; and an opening for inserting the vehicle sensor for seat belt retractor into the sensor housing chamber along a rotation axis of the gear. The lid that closes the part can be attached,
-The lid is formed or fixed with an elastic piece that can be elastically deformed in the form of a cantilever on the inner wall surface located on the sensor housing chamber side when the opening is closed,
The elastic piece projects into the sensor housing chamber when the opening is closed with the lid, and the sensor lever is moved by the sensor weight until the claw of the sensor lever bites between the teeth of the gear. When it is rotated, it comes into contact with the sensor lever and regulates the rotation of the sensor lever.
A gap is formed between the wall of the case that forms the sensor housing chamber and the upper wall that is positioned above the sensor housing chamber and the sensor lever that is restricted by the elastic piece. Has a lever stopper positioned so that
-After the sensor lever comes into contact with the elastic piece, when the force in the direction of rotating the sensor lever further acts on the sensor lever via the gear, the elastic piece is elastically deformed by the sensor lever. The sensor lever is rotated by the gap and comes into contact with the lever stopper.
The distance from the rotation center of the sensor lever to the contact position of the sensor lever and the elastic piece is L1, and the distance from the rotation center of the sensor lever to the contact position of the sensor lever and the lever stopper is If L2, then L1 <L2.
A mounting structure for a vehicle sensor for a seat belt retractor.

Images