JP2012240430A - Mounting part structure of vehicle sensor for seat belt retractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce vehicle interior noise during a vehicle sensor operation.SOLUTION: A sensor holder 10 includes an elastic deformation part 51 at an abutment portion with a turning stopper 37 of a sensor lever 7. The elastic deformation part 51 is deformed when a force in the direction of turning the sensor lever 7 acts on via a gear 5 after the turning stopper 37 is brought into abutment with the sensor holder 10 to enable the sensor lever 7 to be turned by a portion of a clearance 54 so as to be brought into abutment with a lever stopper 42. When setting a distance from the turning axis 47 of the sensor lever 7 to the abutment position P1 of the turning stopper 37 and the sensor holder 10 as L1 and a distance from the turning axis 47 of the sensor lever 7 to the abutment position P2 of the sensor lever 7 and the lever stopper 42 as L2, the turning stopper 37 is formed on the sensor lever 7 so that L1 becomes smaller than L2.

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

As shown in FIG. 31, the vehicle sensor 100 is configured such that the sensor weight (metal spherical mass) 101 is rested in the sensor holder 102 when the vehicle is in a normal state (when the vehicle is 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. 32, when the vehicle running speed changes suddenly due to a vehicle collision or the like and the acceleration acting on the sensor weight 101 exceeds a predetermined value as shown in FIG. 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. .

In the invention of the present application, 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 is rotatably supported by the sensor holder 10. Is rotated by the sensor weight 11 so that 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 the webbing pull-out direction of the gear 5 is The seatbelt retractor vehicle sensor 1 is configured to regulate the rotation of the seatbelt, and the webbing take-up drum is rotatably supported, and the seatbelt retractor vehicle sensor 1 is attached thereto. And a mounting structure of a vehicle sensor 1 for a seat belt retractor including the case 3 It relates.

In this invention, the sensor lever 7 contacts the sensor holder 10 when the claw 8 is rotated by the sensor weight 11 to a position where the claw 8 bites between the teeth 6 and 6 of the gear 5. A rotation stopper 37 that restricts the rotation of the lever 7 is formed. Further, a lever stopper 42 is formed in the case 3 so that a gap 54 is formed between the sensor lever 7 and the sensor lever 7 that is restricted by the rotation stopper 37.
Further, at least one of the contact portions of the rotation stopper 37 and the sensor holder 10 is
Elastic deformation portions 51 (55, 60, 65, 66, 71, 74) are provided.

In the present invention, the elastic deformation portion 51 (55, 60, 65, 66, 71, 74)
) Is further elastically deformed when the force in the direction of rotating the sensor lever 7 is applied via the gear 5 after the rotation stopper 37 abuts the sensor holder 10, and the sensor lever 7 It is possible to rotate by the gap 54 and contact the lever stopper 42. The distance from the rotation axis 47 of the sensor lever 7 to the contact position P1 of the rotation stopper 37 and the sensor holder 10 is L1, and the sensor lever 7 is rotated from the rotation axis 47 of the sensor lever 7. The rotation stopper 37 is formed on the sensor lever 7 so that L1 <L2, where L2 is the distance to the contact position P2 of the lever stopper 42.

According to the present invention, the rotation stopper of the sensor lever that is close to the rotation axis is caused to collide with the sensor holder, and the elastic deformation portion is provided on at least one of the contact portions of the rotation stopper and the sensor holder. Since the portion of the sensor lever that is far from the rotation axis does not collide with the lever stopper, the vehicle interior noise during the operation of the vehicle sensor 1 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. It is sectional drawing of the sensor holder shown cut along the A2-A2 line of FIG.4 (d). FIG. 7A is a longitudinal sectional view of the vehicle sensor showing the first operating state, and FIG. 7B is a longitudinal sectional view of the vehicle sensor showing the second operating state. FIGS. 8A and 8B are diagrams showing a sensor lever of a vehicle sensor, in which FIG. 8A is a rear view of the sensor lever, FIG. 8B is a plan view of the sensor lever, and FIG. FIG. 8 (d) is a left side view of the sensor lever shown in FIG. 8 (a), and FIG. 8 (e) is a sensor shown in FIG. 8 (a). It is a right view of a lever. FIG. 9A is a front view of the sensor lever, and FIG. 9B is a longitudinal sectional view of the sensor lever shown in FIG. FIG. 10A is a partial cross-sectional view of the seat belt retractor showing the first operation state of the vehicle sensor, and FIG. 10B is a partial cross-section of the seat belt retractor showing the second operation state of the vehicle sensor. FIG. It is a longitudinal cross-sectional view which shows the modification 1 of a vehicle sensor. It is a figure which shows the sensor holder which concerns on the modification 1 of a vehicle sensor, and is a figure corresponding to FIG. It is a longitudinal cross-sectional view of the sensor holder which concerns on the modification 1 of a vehicle sensor, and is a figure corresponding to FIG. It is sectional drawing of the sensor holder which concerns on the modification 1 of a vehicle sensor, and is a figure corresponding to FIG. It is a longitudinal cross-sectional view which shows the modification 2 of a vehicle sensor. It is a figure which shows the sensor holder which concerns on the modification 2 of a vehicle sensor, and is a figure corresponding to FIG. It is a longitudinal cross-sectional view of the sensor holder which concerns on the modification 2 of a vehicle sensor, and is a figure corresponding to FIG. FIG. 18A is a cross-sectional view of a sensor holder according to Modification 2 of the vehicle sensor, and corresponds to FIG. FIG. 18B is a partially enlarged view of FIG. FIG. 18C is a partial plan view of FIG. FIG. 19A is a cross-sectional view illustrating a modified example of the sensor holder according to Modified Example 2 of the vehicle sensor, and corresponds to FIG. FIG. 19B is a partially enlarged view of FIG. FIG. 19 (c) is a partial plan view of FIG. 19 (b). FIG. 20A is a cross-sectional view of a sensor holder according to Modification 3 of the vehicle sensor, and corresponds to FIG. FIG. 20B is a partially enlarged view of FIG. FIG. 20C is a partial plan view of FIG. It is a longitudinal cross-sectional view which shows the modification 4 of a vehicle sensor. It is a figure which shows the sensor holder which concerns on the modification 4 of a vehicle sensor, and is a figure corresponding to FIG. It is a longitudinal cross-sectional view of the sensor holder which concerns on the modification 4 of a vehicle sensor, and is a figure corresponding to FIG. It is a longitudinal cross-sectional view of the sensor holder which concerns on the modification 4 of a vehicle sensor, and is a figure corresponding to FIG. It is a longitudinal cross-sectional view of the vehicle sensor which concerns on 2nd Embodiment of this invention. It is a figure which shows the sensor holder of the vehicle sensor which concerns on 2nd Embodiment of this invention, and is a figure corresponding to FIG. It is a figure which shows the sensor lever of the vehicle sensor which concerns on 2nd Embodiment of this invention, and is a figure corresponding to FIG. FIG. 28A is a front view of a sensor lever of a vehicle sensor according to the second embodiment of the present invention, and FIG. 28B is a longitudinal sectional view of the sensor lever shown in FIG. FIG. 29A is a partial sectional view of a seat belt retractor showing a first operation state of a vehicle sensor according to the second embodiment of the present invention, and FIG. 29B is a diagram of the second embodiment of the present invention. It is a partial cross section figure of the seatbelt retractor which shows the 2nd operation state of the vehicle sensor which concerns. It is a figure which shows the modification of the sensor lever of the vehicle sensor which concerns on 2nd Embodiment of this invention. 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 6, the sensor holder 10 includes a bottomed sensor weight accommodating 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. 8 to 9).

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. 8). 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. 8). 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).

In the sensor holder 10, a portion (a part of the ceiling wall 50) in contact with the rotation stopper 37 in the upper surface 24 is an elastic deformation portion 51. The elastic deformation portion 5 of the sensor holder 10
Reference numeral 1 denotes a cantilevered elastic piece 52 formed on the ceiling wall 50 located between the sensor weight housing recess 12 and the side surface 31 and between the pair of support legs 17 and 18. This elastic piece 52 is
As shown in FIG. 4D, the shape in plan view is a rectangular shape, formed so as to be raised from the ceiling wall 50, and the tip is above the upper surface 24 of the ceiling wall 50 (Z in FIGS. 5 and 6). It projects in the axial direction by a predetermined dimension h1. The elastic piece 52 is separated from the ceiling wall 50 by a slit 53 except for the base end portion, and can be bent and deformed (elastically deformed) using the base end portion as a fulcrum.

Further, even if the sensor holder 10 rotates as much as possible until the rotation stopper 37 of the sensor lever 7 bends and deforms the elastic piece 52 and comes into contact with the upper surface 24, the sensor weight 11 comes out of the gap with the sensor lever 7. In order to prevent this, the depth of the sensor weight housing recess 12 is determined (see FIG. 7).

(Sensor lever of vehicle sensor)
As shown in FIGS. 8 to 9, the sensor lever 7 is swingably fitted into the shaft holes 27 and 28 of the support leg portions 17 and 18 of the sensor holder 10 on both side surfaces 13 and 14 on one end side thereof. 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 7). 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. 8A to 8C).

In addition, a rotation stopper 37 is formed to protrude from the lower surface on one end side of the sensor lever 7.
When the sensor lever 7 is rotated by the sensor weight 11 so as to be lifted against its own weight, the rotation stopper 37 of the sensor lever 7 is an elastic piece 52 of the sensor holder 10.
The sensor lever 7 is prevented from rotating (see FIG. 10A).

In addition, when the sensor lever 7 abuts against the elastic piece 52 and a force in a direction in which the sensor lever 7 is further lifted acts from the gear 5, the rotation stopper 37 causes the elastic piece 52 to bend and deform, and the claw 8 acts on the lever stopper 42. It rotates to the position where it abuts (see FIG. 10B).

Further, as shown in FIG. 10B, the sensor lever 7 has a distance L1 from the rotation axis 47 to the contact position P1 of the rotation stopper 37 and the elastic piece 52, and the claw 47 to the claw. 8 and L2 is formed so that L1 <L2.

(Case lever stopper)
As shown in FIG. 1, a synthetic resin lever stopper 42 is integrally formed on the upper part of the sensor housing chamber 4 of the case 3 made of synthetic resin. Between the tip of the lever stopper 42 and the upper opening edge 43 of the sensor housing chamber 4, the pawl 8 of the sensor lever 7 of the vehicle sensor 1 mounted in the sensor housing chamber 4 is connected to the teeth 6, 6 of the gear 5. A window 44 is formed that allows it to protrude to a position that bites in between.

The lever stopper 42 is formed when the sensor lever 7 is lifted by the sensor weight 11 moving in the sensor weight receiving recess 12 of the sensor holder 10 and the rotation stopper 37 of the sensor lever 7 contacts the elastic piece 52. A gap 54 is formed between the lever 7 and the claw 8 (see FIG. 10A). After the elastic piece 52 is bent and deformed by a predetermined amount (elastic deformation), it comes into contact with the claw 8 of the sensor lever 7, and the sensor lever 7 to prevent the claw 8 from getting between the teeth 6 and 6 of the gear 5 and to clamp the claw 8 of the sensor lever 7 between the teeth 6 of the gear 5 (lock). (See FIG. 10B).

(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 FIG. 1 and FIG. 10A, the vehicle sensor 1 detects the sensor weight when the vehicle traveling speed changes suddenly due to a vehicle collision or the like and the acceleration acting on the sensor weight 11 becomes a predetermined value or more. 11 is a sensor weight receiving recess 1 of the sensor holder 10 due to inertia.
2, the sensor weight 11 moves in the sensor weight housing recess 12 while pushing up (rotating) the sensor lever 7.

In the vehicle sensor 1, when the rotation stopper 37 of the sensor lever 7 collides with the elastic piece 52, the elastic piece 52 can elastically deform and absorb the kinetic energy of the sensor lever 7. The collision sound between the stopper 37 and the sensor holder 10 can be suppressed (see FIG. 10A).

In addition, when the vehicle sensor 1 is rotated to a position where the sensor lever 7 contacts the elastic piece 52, 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 10 (a)). When the force in the webbing pull-out direction (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 causes the rotation stopper 37 of the sensor lever 7 to move to the elastic piece 52. Is bent (elastically deformed) and rotated until the sensor lever 7 comes into contact with the lever stopper 42, and the claw 8 of the sensor lever 7 is clamped (locked) by the claw 6 of the gear 5 and the lever stopper 42. 5 can be prevented by the sensor lever 7 (see FIG. 10B). As a result, the vehicle sensor 1 can start a webbing take-up drum locking mechanism (webbing locking mechanism).

When the inertia force is not applied to the sensor weight 11 in the operation state of the vehicle sensor 1 shown in FIGS. 1, 7, and 10, the sensor lever 7 is rotated in the webbing rewind direction by a spring not shown. The urging gear 5 is pressed to rotate in a direction to reduce the swing angle, and is rotated in a direction to decrease the swing angle by its own weight or the elastic force of the elastic piece 52. As a result, the sensor weight 11 is pushed by the sensor lever 7 and has a rest 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 rotation stopper 37 of the sensor lever 7 is made to collide with the elastic piece 52 as the elastic deformation portion 51 of the sensor holder 10, and the rotation stopper 3 from the rotation axis 47 of the sensor lever 7.
7 and the contact position P1 of the elastic piece 52 are shorter than the distance L2 from the rotation axis 47 of the sensor lever 7 to the contact position P2 of the claw 8 of the sensor lever 7 and the lever stopper 42. Compared with the case where the claw 8 of the sensor lever 7 is brought into contact with the lever stopper 42, the speed when the sensor lever 7 collides with another member (sensor holder 10) can be reduced, and the vehicle sensor 1 is activated. Noise can be suppressed.

Further, according to the mounting structure of the seatbelt retractor vehicle sensor 1 according to the present embodiment, after the rotation stopper 37 of the sensor lever 7 collides with the elastic piece 52, the elastic piece 52 is elastically deformed, whereby the sensor lever. Since the 7 claws 8 come into contact with the lever stopper 42, an excessive load is not applied to the support shafts 15, 16 as the rotation fulcrum of the sensor lever 7, and the uneven wear of the support shafts 15, 16, etc. The vehicle sensor 1 does not malfunction due to the above.

(Modification 1)
11 to 14 show a first modification of the sensor holder 10 according to the first embodiment. In the sensor holder 10 according to this modification shown in these drawings, portions corresponding to the sensor holder 10 according to the first embodiment shown in FIGS. 1 to 10 are denoted by the same reference numerals, and the first embodiment. The description which overlaps with the sensor holder 10 according to will be omitted. Note that FIG. 11 is shown in FIG.
FIG. 12 corresponds to FIG. 4, FIG. 13 corresponds to FIG. 5, and FIG. 14 corresponds to FIG.

As shown in these drawings, in the sensor holder 10 according to this modification, an elastic deformation portion 55 is formed on the ceiling wall 50 and at an intermediate position between the pair of support leg portions 17 and 18. This elastic deformation part 5
The center position 5 is located on a center line 56 extending from the center of the sensor weight housing recess 12. The elastically deforming portion 55 is bent toward the upper portion (Z-axis direction in FIGS. 13 and 14) from the thin portion 57 formed by thinning a part of the ceiling wall 50 from the other portions. And a support protrusion 58 formed so as to protrude. When the support protrusion 58 is pressed by the rotation stopper 37 of the sensor lever 7, the thin portion 57 is elastically deformed according to the movement of the rotation stopper 37 and absorbs the kinetic energy of the rotation stopper 37 to rotate. The collision sound at the time of collision with the stopper 37 can be suppressed. Note that the top of the support protrusion 58 is positioned on a center line 56 extending from the center of the sensor weight housing recess 12, and the rotation stopper 3 of the sensor lever 7.
7, the rotation stopper 3 of the sensor lever 7 is pressed by the elastic force of the thin portion 57.
7 to be elastically deformed.

Such an elastic deformation part 55 of the sensor holder 10 according to this modification functions in the same manner as the elastic deformation part 51 of the sensor holder 10 according to the first embodiment. As a result, the vehicle sensor 1 is replaced with the sensor holder 10 according to the present modification instead of the sensor holder 10 according to the first embodiment.
Even if it is used, it is possible to obtain the same operation and effect as the first embodiment.

(Modification 2)
15 to 18 show a second modification of the sensor holder 10 according to the first embodiment. In the sensor holder 10 according to this modification shown in these drawings, portions corresponding to the sensor holder 10 according to the first embodiment shown in FIGS. 1 to 10 are denoted by the same reference numerals, and the first embodiment. The description which overlaps with the sensor holder 10 according to will be omitted. Note that FIG.
16 corresponds to FIG. 4, FIG. 17 corresponds to FIG. 5, and FIG. 18 corresponds to FIG.

As shown in these drawings, in the sensor holder 10 according to this modification, an elastic deformation portion 60 is formed on the ceiling wall 50 and at an intermediate position between the pair of support leg portions 17 and 18. This elastic deformation part 6
0 is located on the center line 56 extending from the center of the sensor weight housing recess 12 and the ceiling wall 5
An annular protrusion 62 formed on the periphery of a through hole 61 that passes through 0 in the vertical direction. The annular protrusion 62 as the elastic deformation portion 60 is formed so as to protrude upward from the upper surface 24 of the ceiling wall 50, and is formed thinner than the thickness of the ceiling wall 50. It is formed so that it can be elastically deformed more easily. When the annular protrusion 62 is pressed by the rotation stopper 37 of the sensor lever 7, it is elastically deformed according to the movement of the rotation stopper 37 and absorbs the kinetic energy of the rotation stopper 37 to rotate. The collision sound at the time of collision with the stopper 37 can be suppressed.

Such an elastic deformation part 60 of the sensor holder 10 according to this modification functions in the same manner as the elastic deformation part 51 of the sensor holder 10 according to the first embodiment. As a result, the vehicle sensor 1 is replaced with the sensor holder 10 according to the present modification instead of the sensor holder 10 according to the first embodiment.
Even if it is used, it is possible to obtain the same actions and effects as in the above embodiment.

In addition, as shown in FIG. 19, the annular protrusion 62 may be easily elastically deformed by inserting a slit 63 in one place.

(Modification 3)
FIG. 20 shows a third modification of the sensor holder 10 according to the first embodiment, and is also a modification of the sensor holder 10 according to the second modification. In the sensor holder 10 according to this modification shown in FIG. 20, the same reference numerals are given to the portions corresponding to the sensor holder 10 according to Modification 2 shown in FIG. 18, and the sensor holder 10 according to Modification 2 A duplicate description is omitted.

As shown in these drawings, the sensor holder 10 according to this modification includes a plurality of protrusions (elastic deformation bodies) 64 that can elastically deform the annular protrusion 62 of the sensor holder 10 according to Modification 2 with a plurality of slits 63. The elastic projections 65 are formed by the plurality of protrusions 64.
Is configured. When the elastic deformation portion 65 is pressed by the rotation stopper 37 of the sensor lever 7, each projection 64 is elastically deformed according to the movement of the rotation stopper 37, and absorbs the kinetic energy of the rotation stopper 37. The collision sound at the time of collision with the rotation stopper 37 can be suppressed (
FIG. 15).

Such an elastic deformation portion 65 of the sensor holder 10 according to this modification functions in the same manner as the elastic deformation portion 51 of the sensor holder 10 according to the first embodiment. As a result, the vehicle sensor 1 is replaced with the sensor holder 10 according to the present modification instead of the sensor holder 10 according to the first embodiment.
Even if it is used, it is possible to obtain the same actions and effects as in the above embodiment.

Here, the elastic deformation portion 65 of the sensor holder 10 according to the present modification is changed to the second modification when the thickness of each protrusion 64 is the same as the annular protrusion 62 of the sensor holder 10 according to the second modification. The sensor holder 10 is elastically deformed more easily than the annular protrusion 62 of the sensor holder 10. Moreover, when the elastic deformation part 65 of the sensor holder 10 which concerns on this modification is made to be easily deformable similarly to the annular protrusion 62 of the sensor holder 10 which concerns on the modification 2, the thickness of each protrusion 64 is made into the modification 2. The thickness of the annular protrusion 62 of the sensor holder 10 according to the above can be made thicker. In addition, the sensor holder 10 shown in FIG.
Exemplifies a mode in which the annular protrusion 62 of the sensor holder 10 according to Modification 2 is divided into two parts.
However, the present invention is not limited to this, and the annular protrusion 62 of the sensor holder 10 according to Modification 2 can be divided into three or more parts to form the elastic deformation part 65.

(Modification 4)
21 to 24 show a fourth modification of the sensor holder 10. In the sensor holder 10 according to this modification shown in these drawings, portions corresponding to the sensor holder 10 according to the first embodiment shown in FIGS. 1 to 10 are denoted by the same reference numerals, and the first embodiment. The description which overlaps with the sensor holder 10 according to will be omitted. 21 corresponds to FIG. 3A, and FIG.
Corresponds to FIG. 4, FIG. 23 corresponds to FIG. 5, and FIG. 24 corresponds to FIG.

As shown in these drawings, the sensor holder 10 according to this modification is provided with an elastic deformation portion 66 on the ceiling wall 50 and at an intermediate position between the pair of support legs 17 and 18. This elastic deformation part 6
6 is an elastic deformation body 68 accommodated in a bottomed hole 67 formed in the sensor holder 10;
The tip of the elastic deformation body 68 protrudes from the upper surface 24 of the ceiling wall 50 of the sensor holder 10. The amount of protrusion of the elastic deformable body 68 from the bottomed hole 67 is the elastic deformable body 6.
Even if 8 is pressed by the rotation stopper 37 of the sensor lever 7 and is elastically deformed, the rotation stopper 37 of the sensor lever 7 does not contact the ceiling wall 50 of the sensor holder 10, and the claw 8 of the sensor lever 7.
Is dimensioned to rotate until it comes into contact with the lever stopper 42 (see FIG. 10B).
. Here, the elastic deformation body 68 is a plastic softer than the sensor lever 7 (for example,
) Or a rod-shaped body made of rubber. The elastic deformation body 68 may be a compression coil spring formed of spring steel or the like. The elastic deformable body 68 is connected to the sensor lever 7.
When the rotation stopper 37 is pressed, it is elastically deformed according to the movement of the rotation stopper 37, absorbs the kinetic energy of the rotation stopper 37, and suppresses the collision sound at the time of collision with the rotation stopper 37. Can do. Note that the sensor holder 10 according to the present modification is formed with an overhanging portion 70 that protrudes downward from a part of the lower surface side of the ceiling wall 50 in order to secure an accommodation space for the elastic deformation body 68.

Such an elastic deformation portion 66 of the sensor holder 10 according to this modification functions in the same manner as the elastic deformation portion 51 of the sensor holder 10 according to the first embodiment. As a result, the vehicle sensor 1 is replaced with the sensor holder 10 according to the present modification instead of the sensor holder 10 according to the first embodiment.
Even if it is used, it is possible to obtain the same actions and effects as in the above embodiment.

[Second Embodiment]
FIGS. 25 to 29 are views for explaining a structure of a mounting portion of a vehicle sensor 1 for seat belt retractor (hereinafter abbreviated as a vehicle sensor) according to a second embodiment of the present invention.
In the attachment structure of the vehicle sensor 1 according to this embodiment shown in these drawings, the same reference numerals are given to the portions corresponding to the attachment structure of the vehicle sensor 1 according to the first embodiment, and The description overlapping with the mounting structure of the vehicle sensor 1 will be omitted. 25 corresponds to FIG. 3A, FIG. 26 corresponds to FIG. 4, FIG. 27 corresponds to FIG. 8, FIG. 28 corresponds to FIG. 9, and FIG. Yes.

The vehicle sensor 1 according to this embodiment is different from the vehicle sensor 1 according to the first embodiment in which the elastic deformation portion 51 is provided in the sensor holder 10 in that the elastic deformation portion 71 is provided in the sensor lever 7.

That is, the sensor lever 7 is a piece along the longitudinal direction (the direction along the −X axis) at the center in the width direction (the direction along the Y axis) and on the tip (lower end) side of the rotation stopper 37. An elastically deformable portion 71 that extends like a cantilever is provided. The elastic deformation portion 71 includes an elastic piece 72 having a rectangular shape (back surface shape) viewed from the lower surface side of the sensor lever 7 and capable of bending deformation, and a hemispherical shape protruding from the lower surface side of the elastic piece 72. Projection 73.

In the vehicle sensor 1 according to this embodiment, as shown in FIG. 29A, when the vehicle traveling speed changes suddenly due to a vehicle collision or the like, and the acceleration acting on the sensor weight 11 becomes a predetermined value or more. The sensor weight 11 moves from the repose position 23 in the sensor weight housing recess 12 of the sensor holder 10 due to inertia, and the sensor weight 11 moves in the sensor weight housing recess 12 while pushing up (rotating) the sensor lever 7. To do.

When the protrusion 73 of the elastic deformation portion 71 provided on the rotation stopper 37 of the sensor lever 7 collides with the ceiling wall 50 of the sensor holder 10, the vehicle sensor 1 uses the kinetic energy of the sensor lever 7 of the elastic deformation portion 71. The elastic piece 72 can be elastically deformed and absorbed, and a collision sound between the rotation stopper 37 of the sensor lever 7 and the sensor holder 10 can be suppressed (FIG. 2).
9 (a)).

Further, when the vehicle sensor 1 rotates to a position where the protrusion 73 of the elastic deformation portion 71 provided on the rotation stopper 37 of the sensor lever 7 contacts the ceiling wall 50 of the sensor holder 10,
The claw 8 of the sensor lever 7 lifted by the sensor weight 11 bites between the teeth 6 and 6 of the gear 5 attached to the webbing take-up drum (see FIG. 29A). When the force in the webbing pull-out direction (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 causes the elastic piece 72 of the sensor lever 7 to move to the sensor holder 10. The sensor lever 7 is bent and elastically deformed by the ceiling wall 50 and rotated to a position where the sensor lever 7 contacts the lever stopper 42. The claw 8 of the sensor lever 7 is clamped between the claw 6 of the gear 5 and the lever stopper 42 ( The rotation of the gear 5 in the webbing pull-out direction can be prevented by the sensor lever 7 (see FIG. 29B). As a result, the vehicle sensor 1 can start a webbing take-up drum locking mechanism (webbing locking mechanism).

(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 protrusion 73 of the elastic deformation portion 71 provided on the rotation stopper 37 of the sensor lever 7 is made to collide with the ceiling wall 50 of the sensor holder 10, and from the rotation axis 47 of the sensor lever 7 to the rotation stopper 37. The protrusion 73 of the elastic deformation part 71 provided on the ceiling wall 5 of the sensor holder 10
The distance L1 to the contact position P1 with 0 is from the rotation axis 47 of the sensor lever 7 to the sensor lever 7
Since the distance L2 between the pawl 8 and the lever stopper 42 to the contact position P2 is shorter than the distance L2 between the pawl 8 of the sensor lever 7 and the lever stopper 42, the sensor lever 7 can be moved to another member (sensor holder). 10), the speed at the time of collision can be reduced, and noise during operation of the vehicle sensor 1 can be suppressed.

Further, according to the mounting portion structure of the vehicle sensor 1 for seat belt retractor according to the present embodiment, the elastic deformation portion 71 provided on the rotation stopper 37 of the sensor lever 7 is provided with the sensor holder 1.
After the collision with the ceiling wall 50 of 0, the elastic piece 72 of the elastic deformation portion 71 is elastically deformed,
Since the claw 8 of the sensor lever 7 comes into contact with the lever stopper 42, an excessive load does not act on the support shafts 15, 16 as the rotation fulcrum of the sensor lever 7, and the support shafts 15, 16
There is no possibility of malfunction of the vehicle sensor 1 due to uneven wear or the like.

Thus, according to the attachment part structure of the vehicle sensor 1 for seatbelt retractors which concerns on this embodiment, the effect | action and effect similar to the attachment part structure of the vehicle sensor 1 for seatbelt retractors which concerns on the said 1st Embodiment are obtained. be able to.

(Modification)
FIG. 30 shows a modification of the sensor lever 7 according to the second embodiment. The sensor lever 7 shown in FIG. 30 extends in the form of a cantilever from the center in the width direction of the rotation stopper 37 toward one end in the width direction (Y-axis direction). An elastic piece 75 serving as an elastic deformation portion 74 extending out and obliquely downward and extending in a cantilever shape is a rotation stopper 3.
It is provided so as to cut up from 7. And the elastic piece 7 as this elastic deformation part 74
5 contacts the ceiling wall 50 of the sensor holder 10 from the tip.

The sensor lever 7 according to this modification example is the same as the sensor lever 7 according to the second embodiment.
Alternatively, the vehicle sensor 1 may be used. The vehicle sensor 1 using the sensor lever 7 according to this modification exhibits the same function as the vehicle sensor 1 using the sensor lever 7 according to the second embodiment.

[Other Embodiments]
In the vehicle sensor 1 according to the first embodiment, the elastic deformation portion 51 is formed in the sensor holder 10, and in the vehicle sensor 1 according to the second embodiment, the elastic deformation portion 71 is provided in the sensor lever 7.
Is formed. However, the vehicle sensor 1 according to the present invention is not limited to this. For example, the elastic deformation portion 51 is formed in the sensor holder 10 and the sensor lever 7 is formed.
The elastically deformable portion 71 may be formed.

In the vehicle sensor 1 according to the present invention, the sensor holder 10 is preferably formed of a material softer than the sensor lever 7 (for example, a flexible grade polyacetal or polyester elastomer).

1 ... Vehicle sensor, 3 ... Case, 5 ... Gear, 6 ... Teeth, 7 ... Sensor lever,
8 ... Claw, 10 ... Sensor holder, 11 ... Sensor weight, 37 ... Turning stopper, 4
2 …… Lever stopper, 47 …… Rotation axis, 51, 55, 60, 65, 66, 71, 74
...... Elastic deformation part, 52, 72, 73 ... Elastic piece, 54 ... Gap, 57 ... Thin part, 58
…… Supporting projection, 61 …… Through hole (hole), 62 …… Circular projection, 64 …… Protrusion, 67 …… Bottomed hole, 68 …… Elastic deformation body

Claims (7)

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 sensor lever is formed with a rotation stopper that abuts on the sensor holder and restricts rotation of the sensor lever when the claw is rotated by the sensor weight to a position where the claw bites between the teeth of the gear. Has been
The case is formed with a lever stopper that is positioned so that a gap is generated between the case and the sensor lever that is restricted by the rotation stopper.
At least one of the contact portions of the rotation stopper and the sensor holder is provided with an elastic deformation portion,
The elastic deformation portion is elastically deformed when the force in the direction of rotating the sensor lever further acts via the gear after the rotation stopper comes into contact with the sensor holder, and the sensor lever is It is possible to contact the lever stopper by rotating by the amount of
The distance from the rotation center of the sensor lever to the contact position of the rotation stopper and the sensor holder 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 When L2, the rotation stopper is formed on the sensor lever so that L1 <L2.
A mounting structure for a vehicle sensor for a seat belt retractor. The elastic deformation portion is a cantilever-shaped elastic piece formed so as to be raised from the sensor holder,
The elastic piece is elastically deformed after the rotation stopper comes into contact, and enables the sensor lever to turn by the gap and contact the lever stopper.
The mounting structure of a vehicle sensor for a seat belt retractor according to claim 1. The elastic deformation portion has a thin-walled portion formed on the sensor holder capable of elastic deformation, and a support protrusion formed on the thin-walled portion and in contact with the rotation stopper,
The thin-walled portion is elastically deformed after the rotation stopper comes into contact with the support protrusion, and allows the sensor lever to turn by the gap and contact the lever stopper.
The mounting structure of a vehicle sensor for a seat belt retractor according to claim 1. The elastically deforming portion is an annular protrusion located at the periphery of a hole formed in the sensor holder,
The annular protrusion is elastically deformed after the rotation stopper comes into contact, and enables the sensor lever to turn by the gap and contact the lever stopper.
The mounting structure of a vehicle sensor for a seat belt retractor according to claim 1. The elastic deformation portion is a plurality of protrusions positioned along the periphery of a hole formed in the sensor holder,
The protrusion is elastically deformed after the rotation stopper comes into contact, and allows the sensor lever to turn by the gap and contact the lever stopper.
The mounting structure of a vehicle sensor for a seat belt retractor according to claim 1. The elastic deformation portion is an elastic deformation body partially accommodated in a bottomed hole formed in the sensor holder,
The elastic deformable body is elastically deformed after the rotation stopper comes into contact with the tip of the portion protruding from the bottomed hole of the sensor holder, and the sensor lever rotates by the gap and contacts the lever stopper. Make contact possible,
The mounting structure of a vehicle sensor for a seat belt retractor according to claim 1. The elastic deformation part has a cantilevered elastic piece formed on the rotation stopper,
The elastic piece is elastically deformed after contacting the sensor holder, and enables the sensor lever to rotate by the gap and contact the lever stopper.
The mounting structure of a vehicle sensor for a seat belt retractor according to claim 1.

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