JP2015096375A - Air bag attachment structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag attachment structure which achieves dynamic damper performance by using an air bag module as a mass and secures the rigidity that withstands an expansion reaction force of an air bag.SOLUTION: An attachment pin 21 supporting an air bag module on a steering wheel includes: a pin body 22 extending in an axial direction (an arrow A direction); and an elastic body 26 having a higher elastic modulus relative to the pin body 22. The pin body 22 includes: an engagement part which engages with the mating side through the elastic body 26. The engagement part includes a hook part which engages with the mating side so as to restrict movement of the attachment pin 21 to the side away from the mating side in the axial direction (the arrow A direction).

Description

  The present invention relates to an airbag attachment structure for attaching an airbag module to a steering wheel.

  2. Description of the Related Art Conventionally, there has been known a structure that obtains dynamic damper performance using an airbag module as a mass by using an elastic body as a mounting pin of an airbag module for a steering wheel (see, for example, Patent Document 1).

The vibration reduction structure of a steering wheel disclosed in Patent Document 1 is such that an airbag module is supported inside a steering wheel via a mounting pin so as to be able to vibrate.
In Patent Document 1, a part or all of the mounting pin is formed of an elastic body, and the elastic body is deformed to reduce vibration from the steering wheel to the airbag module. That is, by using a mounting pin including an elastic body, it functions as a dynamic damper using the airbag module as a mass.

International Publication No. 2013/072215

  However, in the structure of the mounting pin of Patent Document 1, since there is a portion that receives the deployment reaction force of the airbag only by the locking of the elastic body, it is particularly elastic against a load in the pulling direction due to the deployment reaction force. There is a problem that it is difficult to endure only by locking the body.

  The present invention has been made in view of the above-described circumstances, and provides an airbag mounting structure that can easily withstand a deployment reaction force of an airbag while obtaining dynamic damper performance using an airbag module as a mass. Is.

In order to solve the above problems, the present invention proposes the following means.
That is, the invention according to claim 1 is an airbag mounting structure in which an airbag module (for example, the airbag module 10 of the embodiment) is movably mounted on a steering wheel (for example, the steering wheel 1 of the embodiment) in its axial direction. The steering wheel is provided with mounting pins (for example, mounting pins 21, 21 ′, 51 of the embodiment) for supporting the airbag module, and the mounting pins extend in the axial direction (for example, the pin body 22 of the embodiment). , 22 ′, 52) and an elastic body (for example, the elastic bodies 26, 26 ′, 56 of the embodiment) having a relatively high elastic modulus with respect to the pin body, Engagement parts (for example, engagement parts 23k, 24k, 23k ′, 24k of the embodiment) that engage with the other side via an elastic body ', 53k, 54k), and the engagement portion is a hook portion (for example, the hook portion of the embodiment) that is engaged with the counterpart side so as to restrict movement in the axial direction to the side away from the counterpart side. 23b, 24b, 25b, 25b ′, 53b, 54b).

In the above configuration, the pin main body of the mounting pin has an engaging portion that engages with the other side via the elastic body, and the engaging portion regulates movement to the side away from the other side in the axial direction. Thus, by having a hook portion to be engaged with the counterpart side, the other side (for example, when the pin main body has a split structure, the other pin main body or the pin main body In the case of a member, movement to the side away from the core of the steering wheel or the retainer of the airbag module is restricted, and as a result, a structure that can easily withstand the deployment reaction force of the airbag along the axial direction Can do.
The mounting pin has a pin body and an elastic body having a relatively high elastic modulus with respect to the pin body. For example, the pin body occupying most of the entire pin is made of metal. By forming the elastic body from rubber, it is possible to obtain dynamic damper performance using the airbag module as a mass while obtaining rigidity that can withstand the reaction force of the airbag.

  The invention according to claim 2 is characterized in that the engaging portions (for example, the engaging portions 23k, 24k, 24k 'in the embodiment) have a symmetrical shape with respect to the axis of the mounting pin.

  In the above configuration, by providing the engaging portion so as to be symmetric with respect to the axis of the mounting pin (for example, so as to have line symmetry and rotational symmetry), it is possible to set a damper performance that is symmetric with respect to the axis for each pin. it can.

  In the invention according to claim 3, the pin body is made of metal and is divided in the axial direction (for example, the upper pins 23, 23 ', 53 and the lower pins 24, 24' of the embodiment). , 54), and each of the divided bodies connected to each other has the engaging portions engaging with each other, and the elastic body is disposed between the engaging portions engaging with each other. It is characterized by being.

  In the above configuration, the pin body of the mounting pin is made of a metal and is composed of a plurality of divided bodies divided in the axial direction, and the divided bodies connected to each other have the engaging portions, and between these engaging portions. By disposing the elastic body on the two sides, the divided bodies can be connected to each other without bringing the metal parts of the divided bodies into contact with each other, so that the vibration can be satisfactorily received and attenuated.

  Moreover, in the invention which concerns on Claim 4, the said engaging parts (for example, engaging part 23k of embodiment, for example) which each of the said divided bodies (for example, divided body 23, 23 ', 24, 24' of embodiment) which mutually connects each have. One of 24k, 23k ', 24k') is a central projecting portion projecting along the axis of the mounting pin from the central portion of one of the divided bodies to the other divided body (for example, in the embodiment) A central projecting portion 23a, 24a) and a central hook portion as the hook portion (for example, the central hook portion 23b of the embodiment, provided at the tip of the central projecting portion and projecting to the outer peripheral side in a direction perpendicular to the axis) 24b), and the other of the engaging portions of each of the divided bodies connected to each other is from the outer peripheral portion of the other divided body having itself toward the one divided body, and the central hook portion An outer peripheral protrusion (for example, the outer peripheral protrusions 25a and 25a ′ in the embodiment) that protrudes along the axis to surround the axis, and provided at the tip of the outer peripheral protrusion, on the inner peripheral side in a direction orthogonal to the axis An outer peripheral hook portion as the hook portion (for example, the outer peripheral hook of the embodiment) that protrudes and is arranged on the one divided body side with respect to the central hook portion and at least partially overlaps the central hook portion when viewed from the axial direction. Part 25b, 25b ').

  In the above configuration, a central hook portion is provided at the tip of the central protrusion located at the central portion of one divided body, and an outer peripheral hook portion is provided at the tip of the outer peripheral protrusion surrounding the central hook portion in the other divided body. By arranging the hook portion and the outer peripheral hook portion so as to wrap when viewed from the axial direction, a structure that can easily withstand the force in the pulling direction of the airbag deployment reaction force is obtained by locking the central hook portion and the outer peripheral hook. be able to.

  In the invention according to claim 5, one of the engagement portions (for example, the engagement portions 53 k and 54 k of the embodiment) respectively included in the divided bodies (for example, the engagement portions 53 and 54 of the embodiment) connected to each other is A first protrusion (for example, the first protrusion 53a of the embodiment) that protrudes from one divided body having itself toward the other divided body along the axis of the mounting pin, and the first protrusion A first hook portion (for example, the first hook portion 53b of the embodiment) as the hook portion that protrudes in a direction orthogonal to the axis, and the divided members that are connected to each other are respectively provided The other engaging portion has a second protruding portion that protrudes along the axis from the other divided body having the other portion toward the one divided body while avoiding the first protruding portion (for example, implementation) Form second protrusion 54 ), The first hook provided at the tip of the second projecting portion, projecting in a direction perpendicular to the axis, disposed on the one divided body side with respect to the first hook portion, and viewed from the axial direction. And a second hook portion (for example, the second hook portion 54b of the embodiment) as the hook portion, which overlaps at least partly with the portion.

  In the above configuration, the first projecting portion and the first hook portion are provided on one divided body, the second projecting portion and the second hook portion are provided on the other divided body, and the first hook portion and the second hook portion are pivoted. By arranging to wrap when viewed from the direction, it is possible to make the structure easy to withstand the force of the airbag deployment reaction force, particularly in the pulling direction, by locking the first hook portion and the second hook portion.

  Further, in the invention according to claim 6, at least one of the engaging portion and the counterpart side protrudes into the elastic body when the engaging portion and the counterpart side move away from each other (for example, in the embodiment). A convex portion 60) is provided.

  In the above configuration, by providing a convex portion that bites into the elastic body when the engaging portion and the other side move away from each other, the displacement of the elastic body that is elastically deformed when subjected to the airbag deployment reaction force is suppressed. The movement of the mounting pin can be easily controlled, and the deployment behavior of the airbag can be stabilized.

  According to the airbag mounting structure of the present invention, the airbag deployment reaction force can be achieved while obtaining dynamic damper performance using the airbag module as a mass without newly providing parts by devising the mounting pin that supports the airbag module. The structure can be easily tolerated.

It is a figure which shows the vehicle interior surface of the motor vehicle at the time of the non-deployment of an airbag. It is II-II sectional drawing of FIG. It is the III section enlarged view of FIG. It is sectional drawing in alignment with the axis line in 1st embodiment of the attachment pin of this invention, (a) is before the load effect | action of an attachment pin, (b) shows the time of tensile load effect | action of an attachment pin, respectively. It is VV sectional drawing of FIG. It is a disassembled perspective view of the said attachment pin. It is sectional drawing equivalent to Fig.4 (a) which shows the modification of the said attachment pin. It is sectional drawing in alignment with the axis line in 2nd embodiment of the attachment pin of this invention, (a) is before the load effect | action of an attachment pin, (b) shows at the time of the tensile load effect | action of an attachment pin, respectively.

<First embodiment>
A first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, an automobile steering wheel 1 includes a central cover portion 2, a plurality of spoke portions 3 that extend radially outward from the periphery of the cover portion 2, and tip ends of the plurality of spoke portions 3. The ring-shaped rim portions 4 are connected to each other, and are made of a synthetic resin in which a core metal 5 is embedded. The boss portion 5 a of the metal core 5 embedded in the cover portion 2 is fitted to the tip of the steering shaft 6 and fastened with a nut 7.

  In the present embodiment, the axial direction is defined as the longitudinal direction of the steering shaft 6 and is indicated by the arrow A direction in the figure. The direction perpendicular to the axis is defined as a direction orthogonal to the longitudinal direction of the steering shaft 6 and is indicated by the arrow B direction and the arrow B1-B4 directions in the figure.

An air bag module 10 is installed on the metal core 5 of the steering wheel 1.
As shown in FIGS. 2 and 3, the airbag module 10 includes an inflator 11 that generates high-pressure gas, an airbag 12 that is disposed in a folded state behind the inflator 11 (vehicle compartment side), and an airbag. The 1st retainer 13 and the 2nd retainer 14 which sandwich 12 opening parts are provided. The first retainer 13, the opening of the airbag 12, the second retainer 14, and the flange 11 a protruding from the outer periphery of the inflator 11 are fastened by a plurality of bolts 15 and nuts 16 while being overlapped with each other.

The rear surface of the airbag module 10 is covered with a steering pad 17. A connecting portion 17 a extends forward from the outer peripheral portion of the steering pad 17, and the connecting portion 17 a is fixed to the outer peripheral portion of the second retainer 14 with a bolt 18 and a nut 19.
The airbag module 10 thus configured is floatingly supported on the core metal 5 of the steering wheel 1 by the three floating support portions 20.

  As is apparent from FIGS. 2 and 3, the three floating support portions 20 that support the airbag module 10 on the core 5 have two locations on the left and right sides of the upper portion around the steering shaft 6, and 1 in the center of the lower portion. The structure is the same, and all the structures are the same. FIG. 2 shows two floating support portions 20 on both the left and right sides of the upper portion of the steering shaft 6.

Hereinafter, the structure of the floating support 20 will be described with reference to FIG.
The floating support portion 20 includes three attachment pins 21 extending in the axial direction. Each mounting pin 21 has a large-diameter head portion 21A and a small-diameter shaft portion 21B. The mounting pin 21 is constituted by a pin main body 22 made of a metal such as stainless steel for the most part of the entire pin. The pin body 22 is divided into two in the axial direction into an upper pin 23 (divided body) and a lower pin 24 (divided body).
The upper pin 23 and the lower pin 24 have engaging portions 23k and 24k that engage with each other at a connecting portion therebetween. An elastic body 26 made of rubber such as EPDM having a relatively high elastic modulus with respect to the pin main body 22 is disposed in a gap portion between the both engaging portions 23k, 24k. The upper pin 23 and the lower pin 24 are integrated.

The engaging portion 23k of the upper pin 23 includes a central projecting portion 23a that is disposed so as to project in the axial direction (direction of arrow A) along the axis O from the central portion of the facing surface facing the lower pin 24 toward the lower pin 24. And a central hook portion 23b that protrudes to the outer peripheral side in the direction perpendicular to the axis O (in the direction of arrow B) at the tip of the central protruding portion 23a.
The engaging portion 24k of the lower pin 24 has a surrounding shape provided at the peripheral edge so as to surround the central protruding portion 23a and the central hook portion 23b of the upper pin 23.
The engaging portion 24k includes an outer peripheral protruding portion 25a that protrudes in the axial direction from the peripheral portion of the opposing surface of the lower pin 24 facing the upper pin 23 toward the upper pin 23, and the tip of the outer peripheral protruding portion 25a. And an outer peripheral hook portion 25b that protrudes to the inner peripheral side in the direction perpendicular to the axis.

The outer peripheral hook portion 25b is disposed closer to the upper pin 23 than the central hook portion 23b, and is disposed so as to at least partially overlap the central hook portion 23b when viewed from the direction along the axis O. As a result, the central hook portion 23b of the upper pin 23 and the outer peripheral hook portion 25b of the lower pin 24 are in a positional relationship in which they are locked to each other with respect to the axial direction that receives the deployment reaction force of the airbag 12.
When the mounting pin 21 receives a force in the pulling direction of the airbag deployment reaction force, as shown in FIG. 4B, the elastic body 26 is compressed between the central hook portion 23b and the outer peripheral hook portion 25b. Since the central hook portion 23b and the outer peripheral hook portion 25b are engaged with each other, the disengagement of both the engaging portions 23k and 24k is effectively prevented. The elastic body 26 is provided so as to wrap the entire surface of the engaging portion 23k of the upper pin 23, and allows the three-dimensional relative movement of the upper pin 23 and the lower pin 24.
Here, both the engaging portions 23k, 24k and the elastic body 26 have a line-symmetric shape with the axis O of the mounting pin 21 as the center when viewed in the direction perpendicular to the axis from the notch 40 side described later.

  As a method for manufacturing the mounting pin 21, an upper pin 23 and a lower pin 24 are arranged in series in a mold, and a rubber material for forming an elastic body 26 is injected between the upper pin 23 and the lower pin 24. Insert molding is used.

As shown in FIG. 6, a cutout 40 through which the engaging portion 23k of the upper pin 23 can pass is formed on the side surface of the engaging portion 24k of the lower pin 24. Through the notch 40, the upper pin 23 and the lower pin 24 are installed in the mold with the engaging portion 23k inserted into the engaging portion 24k.
Thereafter, a rubber to be an elastic body 26 is injected into a gap portion between the upper pin 23 and the lower pin 24 to manufacture the mounting pin 21 in which the upper pin 23, the lower pin 24 and the elastic body 26 are integrated. To do.

  As shown in FIGS. 4A and 5, an annular groove 23 c is formed on the outer periphery of the upper pin 23. The annular groove 23c is fitted to the peripheral edge of the mounting hole 14a of the second retainer 14. In this state, the shaft portion 21 </ b> B is disposed in front of the second retainer 14, so that the attachment pin 21 is planted forward in the second retainer 14.

  As shown in FIGS. 3 and 5, a support hole 27 is formed in a portion of the cover portion 2 that covers the boss portion 5 a of the metal core 5 of the steering wheel 1 from the rear, and a cylindrical shape of the guide bush 28 is formed in the support hole 27. The part 28a is fitted. A support hole 5b coaxial with the support hole 27 of the cover part 2 passes through the boss part 5a of the metal core 5, and is attached to the inner peripheral surface of the guide bush 28 and the inner peripheral surface of the support hole 5b of the boss part 5a. The shaft portion 21B of the pin 21 is slidably fitted. A coil spring 30 is disposed on the outer periphery of the shaft portion 21B of the mounting pin 21, and one end of the coil spring 30 contacts the lower pin 24 of the head portion 21A of the mounting pin 21, and the other end contacts the flange portion 28b of the guide bush 28. Abut.

As shown in FIG. 3, at the tip of the shaft portion 21B of the mounting pin 21, a tapered portion 21a having a conical diameter reduction, and a groove shape extending perpendicularly to the axis O on the side surface on the head 21A side of the tapered portion 21a. Are formed in the notch 21b.
A locking member 31 made of a spring steel wire bent in a U-shape is provided on the front surface of the boss portion 5a of the cored bar 5, and the locking member 31 engages with the notch 21b of the mounting pin 21. Thus, the mounting pin 21 is locked so as not to come off from the guide bush 28.

As shown in FIGS. 3 and 5, an opening 2 a is formed in a portion of the cover portion 2 covering the front surface of the boss portion 5 a of the metal core 5 so as to substantially follow the shape of the locking member 31. A semicircular opening 2b that is continuous with the support hole 5b of the boss portion 5a of the cored bar 5 is formed in the 2a so as to cut out a part of the side portion.
Two first projecting portions 2c protrude from one end side of the opening 2a so as to correspond to the pair of distal end portions 31a of the locking member 31, and correspond to the bent portion 31b of the locking member 31. The second overhang 2d protrudes from the other end of the opening 2a.

On the other hand, on the rear surface of the boss portion 5a of the metal core 5, a groove 2 that holds the pair of tip portions 31a of the locking member 31 in cooperation with the two first overhang portions 2c of the cover portion 2 is formed. One U-shaped groove that holds the bent portion 31b of the locking member 31 in cooperation with the first protruding portion 5c and the second protruding portion 2d of the cover portion 2. A second overhang portion 5d is formed. The width in the axial direction (arrow A direction) of the notch 21 b of the shaft portion 21 </ b> B of the mounting pin 21 is set larger than the diameter of the locking member 31.
As shown in FIG. 3, a movable contact 32 projects forward from the second retainer 14 in the vicinity of the floating support portion 20, and a fixed contact 33 that can contact the movable contact 32 on the cover portion 2 of the steering wheel 1. Is projected backwards. These movable contact 32 and fixed contact 33 constitute a horn switch 34.

Next, the operation of the first embodiment of the present invention having the above configuration will be described.
First, a procedure for attaching the airbag module 10 to the steering wheel 1 will be described. Since the opening 2a shown in FIG. 5 is open on the front surface of the cover portion 2 of the steering wheel 1, the two distal end portions 31a of the U-shaped locking member 31 are elastically deformed in a direction approaching each other. After inserting the bent portion 31 b of the locking member 31 into the second overhanging portion 2 d of the cover portion 2, the both end portions 31 a are positioned between the pair of first overhanging portions 2 c of the cover portion 2. Release your hand. Then, both end portions 31a of the locking member 31 expand in a direction away from each other by their own elasticity, and engage with the inside of the pair of first projecting portions 2c of the cover portion 2 to attach the locking member 31. Is completed.

Subsequently, the airbag module 10 is approached from the rear to the front toward the steering wheel 1, and the shaft portion 21 </ b> B of the mounting pin 21 is inserted into the guide bush 28. Then, the taper portion 21a of the shaft portion 21B of the mounting pin 21 presses one end portion 31a of the locking member 31 and elastically deforms into the chain line state of FIG. It is inserted into the support hole 5b of the boss portion 5a.
When the notch 21 b of the shaft portion 21 </ b> B of the mounting pin 21 reaches a position facing the one tip portion 31 a of the locking member 31, one tip portion of the locking member 31 is caused by the elastic force of the mounting pin 21. 31a expands outward and engages with the notch 21b, and the mounting pin 21 is locked so as not to fall off.

  In this way, the three attachment pins 21 can be locked to the steering wheel 1 and fixed by the locking member 31 simply by pressing the airbag module 10 toward the steering wheel 1. It can be greatly reduced.

  As shown in FIG. 3, when the upper right part, upper left part or middle lower part of the steering pad 17 of the steering wheel 1 is pushed in the direction of arrow A to operate the horn (not shown), the second retainer of the airbag module 10 The three mounting pins 21 of the three floating support portions 20 provided in 14 are guided by the guide bush 28 provided in the steering wheel 1 and the support hole 5b of the core metal 5 to compress the coil spring 30, The airbag module 10 moves forward with respect to the steering wheel 1. At this time, since the length of the notch 21b of the mounting pin 21 is larger than the diameter of the locking member 31, it is attached to the locking member 31 by the difference between the length of the notch 21b and the diameter of the locking member 31. The pin 21 is allowed to advance.

  When the airbag module 10 moves forward in this way, the horn switch 34 is closed by bringing the movable contact 32 provided on the airbag module 10 side into contact with the fixed contact 33 provided on the steering wheel 1 side, and is not shown. The horn is connected to the battery and can be sounded.

By the way, if the vibration of the engine or the vibration from the road surface is transmitted to the steering wheel 1 via the steering shaft 6, the driver's hand holding the steering wheel 1 vibrates and gives an unpleasant feeling. 1 vibration is suppressed. The dynamic damper has a mass supported by a vibrating body via an elastic body 26. In this embodiment, the airbag module 10 (of which the inflator 11 having a particularly heavy weight) functions as the mass, and the mounting pin 21 is used. The elastic body 26 that constitutes a part of this is made to function as an elastic body of the dynamic damper.
By making the airbag module 10 function as a dynamic damper mass in this way, there is no need to provide a special mass, which is advantageous not only in terms of the number of parts, weight, installation space, and cost, but also the elasticity of the dynamic damper. Since the body 26 is configured as a part of the mounting pin 21 that supports the airbag module 10 on the steering wheel 1, it is possible to contribute to the reduction of the number of parts and the number of assembling steps.

The dynamic damper according to the present embodiment reduces vibrations in the direction perpendicular to the axis of the steering wheel 1 (for example, the direction of arrows B1-B2 or the direction of arrows B3-B4 in FIG. 1). This is determined by the mass of the airbag module 10 and the spring constant of the elastic body 26. At this time, the coil spring 30 that floats and supports the airbag module 10 in the axial direction (direction of arrow A) does not elastically deform in the direction perpendicular to the axis, and thus does not contribute to the vibration damping characteristics of the dynamic damper.
Therefore, the spring constant of the coil spring 30 may be set so as to prevent malfunction due to vibration of the horn switch 34 composed of the movable contact 32 and the fixed contact 33 and to satisfy the operation feeling, and the design flexibility is greatly improved. To do. On the other hand, since the spring constant of the elastic body 26 of the present embodiment can be set by focusing only on the vibration damping characteristics of the dynamic damper, the degree of freedom in design is greatly improved.
That is, since the spring constant in the direction perpendicular to the axis can be arbitrarily adjusted by changing the hardness and thickness of the elastic body 26 made of rubber, for example, the vertical direction of the steering wheel 1 (the B1-B2 direction in FIG. 1). The characteristics of the dynamic damper that reduces the vibration of the steering wheel 1 and the characteristics of the dynamic damper that reduces the vibration of the steering wheel 1 in the left-right direction (B3-B4 direction in FIG. 1) are the operating characteristics of the horn switch 34 (the spring constant of the coil spring 30). ) Can be set independently of each other, and vibration in the direction perpendicular to the axis of the steering wheel 1 can be effectively reduced. In addition, the change of the thickness etc. of the elastic body 26 is accompanied by the change of the thickness etc. of each part of the engaging parts 23k and 24k.

Further, in the mounting pin 21 used here, the outer peripheral hook portion 25b located on the lower pin 24 side is disposed on the opposite surface side on the upper pin 23 side than the central hook portion 23b located on the upper pin 23 side, And it is the structure arrange | positioned so that at least one part may overlap with the center hook part 23b seeing from the direction in alignment with the axis line O. For this reason, the central hook portion 23b on the upper pin 23 side and the outer peripheral hook portion 25b on the lower pin 24 side are in a positional relationship in which they are locked to each other in the direction of the arrow A that receives the reaction force for deploying the airbag 12. .
As a result, when the mounting pin 21 receives an airbag deployment reaction force in the direction along the axis O (the direction of the arrow A), as shown in FIG. The reaction force can be received by the engaging portions of the central hook portion 23b and the outer peripheral hook portion 25b. As a result, it is possible to effectively prevent the member from coming off when the mounting pin 21 receives a force in the pulling direction of the airbag deployment reaction force along the axial direction (arrow A direction).

As described above in detail, in the airbag mounting structure of the present embodiment, the pin body 22 of the mounting pin 21 is configured by the upper pin 23 and the lower pin 24 that are divided bodies, and the upper pin that is one divided body. A central hook portion 23b is provided at the tip of the central projection portion 23a located at the central portion of the central portion 23, and the lower pin 24, which is the other divided body, has an outer periphery surrounding the central projection portion 23a and the central hook portion 23b of the upper pin 23. A protruding portion 25a and an outer peripheral hook portion 25b are provided, and the outer peripheral hook portion 25b is disposed closer to the upper pin 23 than the central hook portion 23b, and at least one of the central hook portion 23b when viewed from the direction along the axis O. Arranged so that the parts overlap. As a result, the central hook portion 23b and the outer peripheral hook portion 25b are locked so as to overlap with the direction of the arrow A, and effective removal of the member when the airbag deployment reaction force in the direction of the arrow A along the axis O is received. It is possible to prevent such a problem and to obtain rigidity that can withstand the reaction force for deploying the airbag.
In the airbag mounting structure, the mounting pin 21 is composed of a pin main body 22 and an elastic body 26 having a relatively high elastic modulus with respect to the pin main body 22, for example, a pin that occupies most of the entire pin. By forming the upper pin 23 and the lower pin 24 of the main body 22 from metal, it is possible to obtain rigidity sufficient to withstand the airbag deployment reaction force and to obtain dynamic damper performance using the airbag module 10 as a mass. In addition, since the elastic body 26 is disposed between the upper pin 23 and the lower pin 24, the metal portions of the upper pin 23 and the lower pin 24 are connected without being in contact with each other, so that the vibration is satisfactorily received and attenuated. Can be made.

  Further, in the airbag mounting structure, the engaging portion of the pin body 22 is arranged so as to be symmetric with respect to the axis O of the mounting pin 21 (in the first embodiment, so as to be line symmetric). It becomes possible to set various damper performances based on the axis O for each pin.

In the airbag mounting structure of the first embodiment, the upper pin 23 is provided with the central protrusion 23a and the central hook 23b, and the lower pin 24 is provided with the surrounding shape including the outer peripheral protrusion 25a and the outer hook 25b. However, these components may be arranged in the opposite direction.
That is, like the pin body 22 ′ of the mounting pin 21 ′ shown in FIG. 7, a central protrusion 24a and a central hook portion 24b are provided as the engaging portion 24k ′ of the lower pin 24 ′, and the engaging portion of the upper pin 23 ′. 23k ′ may be provided with a surrounding shape including an outer peripheral protrusion 25a ′ and an outer hook 25b ′, and an elastic body 26 ′ may be disposed in a gap portion therebetween.

Here, the upper pin 23 of FIG. 7 is formed in a cylindrical shape that is continuous with the outer peripheral protruding portion 25a ′, and opens the internal space of the engaging portion 23k ′ to the side opposite to the lower pin 24 ′. Even if the outer hook portion 25b ′ and the central hook portion 24b ′ are overlapped when viewed from the direction along the axis O by inserting the lower pin 24 ′ from the opening portion of the engaging portion 23k ′, FIG. The upper pin 23 'and the lower pin 24' can be combined without providing such a notch 40.
It can be said that the engaging portions 23k ′ and 24k ′ in FIG. 7 are provided so as to be rotationally symmetric about the axis O of the mounting pin 21 ′.

  In the airbag mounting structure of the first embodiment including the above modification, elastic bodies 26 and 26 'are interposed between the upper pins 23 and 23' and the lower pins 24 and 24 'constituting the divided body, Although the movement of the upper pins 23, 23 'and the lower pins 24, 24' in the axial direction (arrow A direction) and the axis perpendicular direction (arrow B direction) is restricted, the present invention is not limited to this configuration. A metal pin main body is integrally formed, and an engaging portion provided on the pin main body is engaged with the metal core 5 of the steering wheel 1 or the retainer 14 of the airbag module 10 with an elastic body interposed therebetween. Also good. Moreover, a pin main body may be comprised by three or more division bodies, and an engaging part and an elastic body may be arrange | positioned among these, respectively.

<Second embodiment>
Next, a second embodiment of the present invention will be described with reference to FIG.
The airbag mounting structure of the second embodiment is particularly different from the first embodiment in the configuration of the mounting pin 51 in place of the mounting pin 21, and the same reference numerals are used for the same configurations as in the other first embodiments. Detailed description will be omitted.

As shown in FIG. 8A, the mounting pin 51 of the present embodiment is constituted by a pin main body 52 made of a metal such as stainless steel, in the same manner as the mounting pin 21. The pin main body 52 is divided into two in the axial direction into an upper pin 53 (divided body) and a lower pin 54 (divided body).
The upper pin 53 and the lower pin 54 have engaging portions 53k and 54k that engage with each other at a connecting portion therebetween. An elastic body 56 made of rubber such as EPDM having a relatively high elastic modulus with respect to the pin main body 52 is disposed in a gap portion between the both engaging portions 53k and 54k. The upper pin 53 and the lower pin 54 are integrated.

The engaging portion 53k of the upper pin 53 is a first protruding portion that is arranged to protrude in the axial direction (direction of arrow A) along the axis O toward the lower pin 54 side at the peripheral edge portion of the facing surface facing the lower pin 54 side. 53a, and a first hook portion 53b that is arranged to project toward the inner peripheral side in the direction perpendicular to the axis O (in the direction of arrow B) toward the axis O at the tip of the first protrusion 53a. As a whole, it is formed in an L shape in a side view of FIG.
The engaging portion 54k of the lower pin 54 includes a second protruding portion 54a that is arranged to protrude in the axial direction from the peripheral portion of the surface facing the upper pin 53 side toward the upper pin 53 side, and the tip of the second protruding portion 54a. And a second hook portion 54b that protrudes toward the inner peripheral side in a direction perpendicular to the axis O toward the axis O side, and is formed in an L shape as a whole in a side view of FIG.

The second protrusion 54a on the lower pin 54 side is disposed avoiding the first protrusion 53a on the upper pin 53 side. Specifically, the first projecting portion 53 a and the second projecting portion 54 a are disposed on the peripheral edge portions that are opposite to each other in the radial direction of the mounting pin 51.
The second hook portion 54b on the lower pin 54 side protrudes so as to wrap in the radial direction with the first hook portion 53b on the upper pin 53 side. The center t1 of the lapping margin of the first hook portion 53b and the second hook portion 54b is on the axis O, and the engaging portion 54k of the lower pin 54 and the engaging portion 53k of the upper pin 53 are shown in a side view of FIG. It has a point-symmetric shape with respect to the center t1.

The second hook portion 54b is disposed closer to the upper pin 53 than the first hook portion 53b, and is disposed so as to at least partially overlap the first hook portion 53b when viewed from the direction along the axis O. Accordingly, the first hook portion 53b of the upper pin 53 and the second hook portion 54b of the lower pin 54 are in a positional relationship in which they are locked with each other in the axial direction that receives the deployment reaction force of the airbag 12.
When the mounting pin 51 receives a force in the pulling direction of the airbag deployment reaction force, the elastic body 56 is compressed between the first hook portion 53b and the second hook portion 54b as shown in FIG. 8B. However, since the first hook portion 53b and the second hook portion 54b are locked with each other, the disengagement of both the engaging portions 53k and 54k is effectively prevented.

A convex portion 60 that protrudes toward the second hook portion 54b is provided on the surface of the first hook portion 53b of the upper pin 53 on the second hook portion 54b side, for example, on the tip side. The convex portion 60 has a first hook portion when the mounting pin 51 receives a force in the pulling direction and the upper pin 53 and the lower pin 54 move toward the side away from each other in the axial direction, thereby strongly biting into the elastic body 56. 53b, the 2nd hook part 54b, and the elastic body 56 between these are suppressed relatively shifting | deviating in an axial orthogonal direction, and the bending, eccentricity, etc. which the attachment pin 51 does not intend are suppressed.
The surface of the lower pin 54 on the first hook portion 53b side of the second hook portion 54b is provided with a concave portion 61 that is opposed to the convex portion 60 in the axial direction and can receive the convex portion 60. By biting the elastic body 56 with the convex portion 60 and the concave portion 61, the displacement of the elastic body 56 is more reliably suppressed.

In the present embodiment, the convex portion 60 is provided on the first hook portion 53b side and the concave portion 61 is provided on the second hook portion 54b side. Moreover, you may provide the convex part which bites into the elastic body 56 in both the 1st hook part 53b and the 2nd hook part 54b.
Furthermore, you may provide suitably the convex part and recessed part similar to this embodiment in the engaging parts 23k, 24k, 23k ', and 24k' of 1st embodiment.

  As described above in detail, in the airbag mounting structure of the present embodiment, the pin body 52 of the mounting pin 51 is constituted by the upper pin 53 and the lower pin 54, and the upper pin 53 that is a divided body on one side is engaged. The portion 53k is composed of the first projecting portion 53a and the first hook portion 53b, and the engaging portion 54k of the lower pin 54, which is the other divided body, is composed of the second projecting portion 54a and the second hook portion 54b. The second hook portion 54b of the pin 54 is disposed closer to the upper pin 53 than the first hook portion 53b of the upper pin 53, and at least partly overlaps the first hook portion 53b when viewed from the direction along the axis O. Arranged. As a result, the first hook portion 53b and the second hook portion 54b are locked so as to overlap with each other in the direction of arrow A, and the member is removed when the airbag deployment reaction force in the direction of arrow A along the axis O is received. It can be effectively prevented, and rigidity capable of withstanding the airbag deployment reaction force can be obtained.

  In the airbag mounting structure, the mounting pin 51 includes a pin main body 52 and an elastic body 56 having a relatively high elastic modulus with respect to the pin main body 52. For example, the pin occupying most of the entire pin By forming the upper pin 53 and the lower pin 54 of the main body 52 from metal, it is possible to obtain rigidity sufficient to withstand the reaction force for deploying the airbag and to obtain dynamic damper performance using the airbag module 10 as a mass. In addition, since the elastic body 56 is arranged between the upper pin 53 and the lower pin 54, the metal parts of the upper pin 53 and the lower pin 54 are connected without being in contact with each other, so that the vibration is satisfactorily received and attenuated. Can be made.

  Further, in the airbag mounting structure, at least one of the engaging portions 53k and 54k is provided with a convex portion 60 that bites into the elastic body 56 when the engaging portions 53k and 54k move away from the mating side. Thus, the displacement of the elastic body 56 when the airbag 12 is deployed can be suppressed, the movement of the mounting pin 51 can be easily controlled, and the deployment behavior of the airbag 12 can be stabilized.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

1 Steering wheel 10 Airbag module 21, 21 ', 51 Mounting pin 22, 22', 52 Pin body 23, 23 ', 53 Upper pin (divided body)
23a, 24a Central protrusion 23k, 24k, 23k ', 24k', 53k, 54k Engagement part 23b, 24b Central hook part (hook part)
24, 24 ', 54 Lower pin (divided body)
25a, 25a ′ outer peripheral protrusion 25b, 25b ′ outer peripheral hook part (hook part)
26, 26 ', 56 Elastic body 53a 1st protrusion 53b 1st hook part (hook part)
54a 2nd protrusion 54b 2nd hook part (hook part)
60 Convex

Claims (6)

In the airbag mounting structure in which the airbag module is movably mounted on the steering wheel in the axial direction thereof,
A mounting pin for supporting the airbag module on the steering wheel;
The mounting pin has a pin body extending in the axial direction, and an elastic body having a relatively high elastic modulus with respect to the pin body,
The pin body has an engaging portion that engages with the other side via the elastic body,
The airbag mounting structure according to claim 1, wherein the engaging portion includes a hook portion that is engaged with the counterpart side so as to restrict movement in the axial direction from the counterpart side.   The airbag attachment structure according to claim 1, wherein the engagement portion has a symmetrical shape with respect to an axis of the attachment pin. The pin body is made of metal and is composed of a plurality of divided bodies divided in the axial direction,
The divided bodies that are connected to each other have the engaging portions that engage with each other, and the elastic body is disposed between the engaging portions that engage with each other. The airbag attachment structure of any one of Claim 1 or Claim 2. One of the engaging portions that each of the divided bodies connected to each other has,
A central projecting portion projecting along the axis of the mounting pin from the central portion of one of the divided bodies to the other divided body;
A central hook part as the hook part, provided at the tip of the central projecting part and projecting to the outer peripheral side in a direction perpendicular to the axis,
The other of the engaging portions that each of the divided bodies connected to each other has,
An outer peripheral protruding portion that protrudes along the axis so as to surround the central hook portion from the outer peripheral portion of the other divided body having itself toward the one divided body;
Provided at the tip of the outer peripheral protruding portion, protrudes toward the inner peripheral side in a direction orthogonal to the axis, is disposed closer to the one divided body than the central hook portion, and the central hook portion as viewed from the axial direction The airbag mounting structure according to claim 3, further comprising an outer peripheral hook portion serving as the hook portion at least partially overlapping. One of the engaging portions that each of the divided bodies connected to each other has,
A first protrusion that protrudes along the axis of the mounting pin from the one divided body to the other divided body;
A first hook portion as the hook portion provided at a tip of the first protrusion and protruding in a direction orthogonal to the axis;
The other of the engaging portions that each of the divided bodies connected to each other has,
A second projecting portion projecting from the other divided body having itself toward the one divided body so as to avoid the first projecting portion and along the axis;
Provided at a tip of the second projecting portion, projecting in a direction perpendicular to the axis, disposed on the one divided body side relative to the first hook portion, and at least the first hook portion as viewed from the axial direction The airbag mounting structure according to claim 3, further comprising a second hook portion serving as the hook portion, part of which overlaps.   The convex part which bites into the said elastic body at the time of the movement to the side which mutually separates the said engaging part and the other party is provided in at least one of the said engaging part and the other party. The airbag attachment structure according to any one of the above.

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