JP2013082283A - Mounting part structure for airbag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the work of inserting a mounting member into a mounting hole on a counter part side.SOLUTION: A mounting part structure for an airbag device includes a center member as an example of a first affixation member provided to a steering wheel side, and the airbag device having a mounting plate as an example of a second affixation member. The mounting member 22 is provided on one of the center member and the mounting plate in a protruding manner, and the mounting hole and an engagement body are provided on the other. The mounting member 22 has a column 23 and an engagement protrusion 24 formed with the column 23. A coiled spring 25 which is disposed in a compressed state between the center member 16 and the mounting plate is fitted over the mounting member 22. The coiled spring 25 has a barrel part 26 which can be fitted over the column 23, and an engagement end part 27 which is provided on the front end side of the barrel part 26 and which can be engaged with the engagement protrusion 24 from the base end side of the mounting member 22.

Description

  The present invention relates to a technique for attaching an airbag device to a steering wheel.

  Conventionally, as a configuration for attaching an airbag device to a steering wheel, there is one disclosed in Patent Document 1.

  In Patent Document 1, a pin is provided on a base plate, and a guide hole is formed in an attachment portion provided on a spoke-side metal core. When the pin is inserted into the guide hole of the attachment portion, the switch wire fitted in the attachment portion is locked to the pin. The pin is provided with a coil spring, and the coil spring is interposed between the base plate and the mounting portion in a compressed state with the pin inserted into the guide hole. By this coil spring, the base plate is urged toward the occupant side with respect to the steering wheel.

JP 2001-233159 A

  By the way, since the coil spring has a role of urging the base plate toward the occupant side with respect to the steering wheel, the coil spring is usually set to a dimension longer than that of the pin. However, if the coil spring protrudes beyond the pin, it is difficult to insert the pin into the guide hole.

  Therefore, an object of the present invention is to facilitate the operation of inserting the mounting member into the mounting hole on the other side.

  In order to solve the above-described problem, a first aspect is an airbag device mounting portion structure for mounting an airbag device to a steering wheel, the first fixing member provided on the steering wheel side, an airbag, An airbag device including an inflator capable of inflating and deploying the airbag, a cover covering the folded airbag, and a second fixing member to which the airbag, the inflator and the cover are fixed. A mounting member projects from one side of the first fixing member and the second fixing member, and a mounting hole into which the mounting member can be inserted is formed on the other side of the first fixing member and the second fixing member. And a locking body that can be locked to the mounting member inserted into the mounting hole is provided, and the mounting member includes the first fixing member and the second fixing member. And a locking projection formed at the tip of the column, and the locking body is engaged with the mounting member inserted into the mounting hole. In a stopped state, a coil spring disposed in a compressed state is externally fitted between the first fixing member and the second fixing member, and the coil spring includes a body part that can be externally fitted to the column part, and the body part. And a locking end including a portion that can be locked from the base end side of the mounting member.

  A 2nd aspect is the attachment part structure of the airbag apparatus which concerns on a 1st aspect, Comprising: The said latching end part contains the part which passes the inner side of the said trunk | drum seeing from the axial center direction of the said trunk | drum. .

  A third aspect is an airbag apparatus mounting portion structure according to the second aspect, wherein the locking end portion is folded so as to cross the inside of the trunk as viewed from the axial direction of the trunk. Includes bent parts.

  A 4th aspect is the attachment part structure of the airbag apparatus which concerns on a 2nd or 3rd aspect, Comprising: The said latching end part passes the inner side of the said trunk | drum seeing from the axial center direction of the said trunk | drum. So that it is eccentric.

  A fifth aspect is an attachment structure of an airbag device according to any one of the first to fourth aspects, wherein the locking end holds the body part against the proximal end side of the attachment member. It is formed in a shape to be attached.

  According to a sixth aspect, there is provided a structure for attaching an airbag device according to the fifth aspect, wherein the locking end portion extends so as to protrude outside the trunk portion when viewed from the axial center direction of the trunk portion. Includes the extended tip.

  A seventh aspect is an airbag device attachment structure according to any one of the first to sixth aspects, wherein the locking end portion is seen from the axial direction of the trunk portion. A portion eccentric to pass outside.

  An eighth aspect is an airbag device mounting portion structure according to any one of the first to seventh aspects, wherein the locking end portion is viewed from the axial direction of the trunk portion. A portion formed to have a diameter larger than that of the body portion so as to pass through the outside of the body.

  A ninth aspect is an attachment structure of an airbag device according to any one of the first to eighth aspects, wherein the attachment member is provided on the one side of the first fixing member and the second fixing member. A position restricting projection for restricting the position of the base end of the coil spring is provided between the base end and the base end of the coil spring.

  According to the mounting structure of the airbag device according to the first aspect, the locking end provided on the distal end side of the body portion of the coil spring is locked to the locking projection from the base end side of the mounting member. Since the possible portion is included, the locking end of the coil spring can be locked to the locking protrusion before the mounting member is inserted into the mounting hole. Therefore, when the attachment member is inserted into the attachment hole, the coil spring is unlikely to get in the way, and the attachment member can be easily inserted into the attachment hole.

  According to the 2nd aspect, the part which passes along the inner side of the said trunk | drum seeing from the axial center direction of the said trunk | drum can be reliably latched by the latching protrusion.

  According to the third aspect, the portion that is bent so as to cross the inside of the trunk portion as viewed from the axial direction of the trunk portion of the latching end portion is more reliably latched to the latching protrusion. Can do.

  According to the fourth aspect, the portion of the locking end portion that is eccentric so as to pass through the inside of the trunk portion when viewed from the axial direction of the trunk portion is more reliably locked to the locking projection. be able to.

  According to the fifth aspect, the locking end portion is formed in a shape that presses the body portion against the proximal end side of the mounting member, so that the body portion of the coil spring exceeds the locking end portion and the mounting member. It is hard to protrude to the tip side of the. For this reason, the attachment member can be easily inserted through the attachment hole.

  According to the sixth aspect, the trunk portion of the coil spring exceeds the latching end portion by the tip end portion extending so as to protrude outside the trunk portion when viewed from the axial center direction of the trunk portion. Thus, it can be made difficult to project to the tip end side of the mounting member, and the mounting member can be easily inserted through the mounting hole.

  According to the seventh aspect, the coil spring is connected to the other of the first fixing member and the second fixing member by the portion of the locking end portion that is eccentric so as to pass through the outside of the trunk portion when viewed from the axial direction of the trunk portion. It can be pressed to the side stably.

  According to the eighth aspect, the coil spring is first fixed by the portion of the locking end portion that is formed to have a larger diameter than the body portion so as to pass outside the body portion when viewed from the axial center direction of the body portion. It can be stably pressed against the other side of the member and the second fixing member.

  According to the ninth aspect, the position of the base end of the coil spring can be regulated by the position regulating projection.

It is a disassembled perspective view which shows the steering wheel and airbag apparatus which concern on embodiment. It is a disassembled perspective view which shows a steering wheel and airbag apparatus same as the above. It is a perspective view which shows an attachment member. It is a top view which shows an attachment member. It is a side view which shows an attachment member. It is the VI-VI sectional view taken on the line of FIG. It is a rear view which shows an airbag apparatus. It is a perspective view which shows an airbag apparatus. It is a disassembled perspective view which shows an airbag apparatus. It is a rear view which shows an attachment plate and a latching body. It is the XI-XI sectional view taken on the line of FIG. It is a fragmentary perspective view which shows a mounting plate and a latching body. It is a fragmentary perspective view which shows a mounting plate and a latching body. It is a rear view which shows an attachment plate. It is a perspective view which shows a latching body. It is a perspective view which shows a latching body. It is a front view which shows a locking body. It is the XVIII-XVIII sectional view taken on the line of FIG. It is the XIX-XIX sectional view taken on the line of FIG. It is the XX-XX sectional view taken on the line of FIG. It is the XXI-XXI sectional view taken on the line of FIG. It is XXII-XXII sectional view taken on the line of FIG. It is a disassembled perspective view of a locking body. It is a disassembled perspective view of a locking body. It is explanatory drawing which shows the process of attaching a latching body to an attachment member. It is a disassembled perspective view which shows the attachment part of a steering wheel and an airbag apparatus. It is a side view which shows the attachment part of a steering wheel and an airbag apparatus. It is sectional drawing which shows the attachment part of a steering wheel and an airbag apparatus. It is a top view which shows a 1st modification. It is a side view which shows a 1st modification. It is a top view which shows the 2nd modification. It is a side view which shows a 2nd modification. It is sectional drawing which shows a 2nd modification. It is a top view which shows a 3rd modification. It is a side view which shows a 3rd modification. It is a side view which shows a 4th modification.

  Hereinafter, the attachment part structure of the airbag apparatus which concerns on embodiment is demonstrated. 1 and 2 are exploded perspective views showing the steering wheel 10 and the airbag device 30. FIG.

<Overall Configuration of Steering Wheel 10 and Airbag Device 30>
The attachment structure of the airbag device is a configuration for attaching the airbag device 30 to the steering wheel 10 in the vehicle. The overall configuration of the steering wheel 10 and the airbag device 30 will be schematically described.

  The steering wheel 10 is for steering the vehicle, and includes a wheel body 12, spokes 14, and a central member 16 as a first fixing member. The wheel main body 12 is formed in a ring shape and is a portion that receives a steering force by a person. The central member 16 is a fixing member provided on the steering wheel 10 side. Here, the central member 16 is configured to be connectable to a front end portion of a steering shaft that extends rearward from the front of the driver seat of the vehicle body. The spoke 14 is formed in a long shape (herein, an elongated plate shape) extending from the inner peripheral portion of the wheel main body 12 toward the center thereof, and is connected to the central member 16 at the center of the wheel main body 12. Here, three spokes 14 are provided, but two or the like may be provided. When the steering wheel 10 is rotated, the rotational motion is transmitted to the steering shaft via the spoke 14 and the central member 16. Normally, the steering wheel 10, the spoke 14 and the central member 16 are covered with an exterior member formed of resin or the like.

  A mounting member 22 projects from the central member 16. The airbag device 30 is attached and fixed to the steering wheel 10 using the attachment member 22.

  A coil spring 25 is externally fitted to the mounting member 22. The airbag device 30 is urged by the coil spring 25 in a direction away from the central member 16.

  The airbag device 30 includes an airbag 32, an inflator 34, a cover 36, a mounting plate 40 that is a second fixing member, and a locking body 60.

  The airbag 32 is formed in a bag shape with cloth or the like, and is folded so as to be accommodated in the cover 36.

  The inflator 34 is configured so that the airbag 32 can be inflated and deployed. Here, the inflator 34 has a short cylindrical inflator body 34a and a mounting flange 34b formed on the outer periphery of the inflator body 34a. The inflator body 34a incorporates an ignition device, a gas generating agent, and the like. And when the detection signal etc. from an impact detection part etc. are received at the time of a vehicle collision, the said ignition device will ignite a gas generating agent. As a result, the gas generating agent burns, and the gas generated by this combustion is supplied into the airbag 32. As a result, the airbag 32 is inflated and deployed toward the driver. The attachment flange 34b is formed in a plate shape extending so that the outer peripheral edge forms a square shape, and fixing holes 34c are formed at four corner portions thereof.

  The cover 36 is a member formed of resin or the like, and includes a cover main body 37 and a standing wall 38. The cover body 37 is formed in a dome shape that gently curves. A standing wall 38 surrounding the airbag 32 folded on the inner surface side of the cover main body 37 is projected. Here, the standing wall 38 is formed in a cylindrical shape, but may alternatively be formed in a rectangular tube shape or a shape that partially surrounds the airbag 32. The folded airbag 32 is accommodated in a space surrounded by the cover body 37 and the standing wall 38. The cover body 37 is formed with a tear line that is easily broken by receiving the inflating and deploying force of the airbag 32.

  The mounting plate 40 is configured to be fixed to the cover 36 in a state where the airbag 32 and the inflator 34 are mounted.

  In other words, the mounting plate 40 is formed as a plate-like member having an extent that can close the opening of the standing wall 38. Here, the mounting plate 40 includes a circular plate portion 42 having the same shape as the opening of the standing wall 38, and a peripheral wall 48 formed on the outer periphery of the circular plate portion 42. Then, with the circular plate portion 42 closing the opening of the standing wall 38, the peripheral wall 48 is externally fitted to the opening outer peripheral edge portion of the standing wall 38.

  An opening 42h is formed at the center of the circular plate portion 42, and the inflator 34 is disposed in the opening 42h.

  Further, a screw insertion hole 42c is formed on the outer periphery of the opening 42h in the circular plate portion 42, and the inflator 34 and the airbag 32 are attached as follows using the screw insertion hole 42c. That is, the sandwiching bracket 50 is disposed in the airbag 32 and around the gas inlet 32h. The sandwiching bracket 50 is a member formed of a metal plate or the like, and is here formed in a substantially rectangular plate shape. An opening 50 h in which the inflator 34 can be disposed is formed at the center of the sandwiching bracket 50. In addition, threaded portions 51 protrude from the corner portions of the sandwiching bracket 50. In a state where the sandwiching bracket 50 is disposed in the airbag 32, each screw portion 51 protrudes out of the airbag 32 through a hole formed in the airbag 32 around the gas inlet 32h. The inflator body 34a is disposed in the opening 42h of the mounting plate 40, and the mounting flange 34b is overlapped with the mounting plate 40 with the fixing hole 34c disposed at the same position as the screw insertion hole 42c. Arranged. In this state, the sandwiching bracket 50 is overlapped with the mounting plate 40 so that each screw portion 51 protrudes from the mounting plate 40 through the screw insertion hole 42c and the fixing hole 34c. Then, a nut 52 is screwed and fastened to each screw portion 51 protruding from the mounting plate 40. Thereby, the inflator 34 is attached and fixed to the attachment plate 40, and the airbag 32 is attached and fixed to the attachment plate 40 in a state where the airbag 32 is sandwiched between the sandwiching bracket 50 and the attachment plate 40. In this state, at least a part of the inflator 34 is disposed in the airbag 32.

  The cover 36 is also fixedly attached to the mounting plate 40. The mounting structure will be described later.

  The mounting plate 40 has a mounting hole 43h at a position corresponding to the mounting member 22 on the steering wheel 10 side. A locking body 60 is attached to a portion of the attachment plate 40 corresponding to each attachment hole 43h. When the airbag device 30 is pushed toward the steering wheel 10 and each mounting member 22 is inserted into the corresponding mounting hole 43h, the locking body 60 is locked to each mounting member 22, and the airbag device 30 is moved to the steering wheel. 10 can be attached.

<Configuration in which the airbag device 30 is attached to the steering wheel 10>
The configuration for attaching the airbag device 30 to the steering wheel 10 will be described more specifically.

  3 is a perspective view showing the mounting member 22, FIG. 4 is a plan view showing the mounting member 22, FIG. 5 is a side view showing the mounting member 22, and FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. FIG.

  As shown in FIGS. 1 to 6, the central member 16 of the steering wheel 10 is formed of a conductive member such as a metal, and an attachment member 22 is projected from the central member 16. Here, three attachment bases 20 are provided around the center of the central member 16, and a fixed-side contact 21 and an attachment member 22 project from each attachment base 20.

  More specifically, the mounting base 20, the fixed contact 21 and the mounting member 22 are integrally formed of a conductive member such as metal.

  The mounting base 20 is formed in a square plate shape, and a fixed side contact 21 and a mounting member 22 project from one main surface thereof. The mounting base 20 may be integrally formed with the central member 16 or may be mounted by screwing or the like.

  The fixed-side contact 21 has a shape in which a short cylindrical portion having a small diameter protrudes from the tip of the short cylindrical portion.

  The attachment member 22 has a column portion 23 and a locking projection 24. The column portion 23 is formed so as to protrude from the mounting base 20 to the front side (airbag device 30 side) of the steering wheel 10. Here, the column portion 23 is formed in a semi-cylindrical shape. A locking projection 24 projects from the tip of the column portion 23. Here, the locking protrusion 24 is formed so as to protrude toward the center side of the steering wheel 10. In addition, an inclined surface 22 a is formed at the distal end portion of the locking projection 24 on the airbag device 30 side so as to incline so that the height dimension gradually decreases toward the center of the steering wheel 10. Further, the locking projection 24 has a circular shape when viewed along the axial direction of the column portion 23.

  The column portion may be a columnar shape, a prismatic shape, a cylindrical shape, or the like. Moreover, the latching protrusion 24 should just be a shape which can be latched to the latching body 60, for example, may be a hook shape which protrudes to the whole outer periphery of the front-end | tip part of a pillar part. That is, the latching protrusion should just be the shape which protrudes outside in at least one part of the outer periphery of a pillar part.

  In addition, a coil spring 25 is externally fitted to the mounting member 22. The coil spring 25 has a body portion 26 and a locking end portion 27. The body portion 26 has an inner diameter that can be fitted onto the column portion 23. In other words, the bending radius of the inner peripheral portion of the body portion 26 is larger than the bending radius of the arc-shaped peripheral edge portion in the cross-sectional shape of the column portion 23. As a result, the body portion 26 can be stretched and deformed along the axial direction of the column portion 23 in a state where the body portion 26 is externally fitted to the column portion 23.

  The locking end portion 27 includes a portion that can be locked to the locking protrusion 24 from the proximal end side of the mounting member 22. In order to form the locking end portion 27, at least a part of the tip end portion of the coil spring 25 may be formed so as to pass through the inside of the trunk portion when viewed from the axial direction of the trunk portion 26. Here, the locking end portion 27 extends so that the portion extending from the end portion of the body portion 26 crosses the inner periphery of the body portion 26 (more specifically, while drawing a slightly outward arc). ) It is a folded configuration.

  Further, a space through which the column part 23 can pass is provided between the body part 26 and the locking end part 27 when viewed from the axial direction of the body part 26. That is, when the coil spring 25 is attached to the attachment member 22 so that the axis of the coil spring 25 and the axis of the attachment member 22 coincide with each other, when viewed from the axial direction of the trunk portion 26, the locking end 27 is engaged. Although it overlaps with the stop protrusion 24, it is formed so that it may not overlap with the pillar part 23. Therefore, the portion of the coil spring 25 where the locking end portion 27 is provided can also move along the axial direction of the column portion 23. The natural length of the coil spring 25 is longer than the length dimension between the base end portion of the attachment member 22 and the locking end portion 27, and preferably longer than the entire length of the attachment member 22.

  In a state before the locking body 60 is locked to the mounting member 22, the locking end 27 is locked to the locking protrusion 24 from the base end side of the mounting member 22, and the coil spring 25 is mounted. The member 22 can be maintained in a compressed state so as not to protrude toward the distal end side.

  Further, in a state where the locking body 60 is locked to the mounting member 22, the coil spring 25 is disposed in a compressed state between the mounting base 20 provided on the central member 16 and the mounting plate 40. Then, the mounting plate 40 can be urged away from the central member 16 by the elastic force of the coil spring 25 trying to return to the natural length.

  FIG. 7 is a rear view showing the airbag device 30, FIG. 8 is a perspective view showing the airbag device 30, and FIG. 9 is an exploded perspective view showing the airbag device 30. 8 and 9, the inflator 34 and the airbag 32 are omitted. 10 is a rear view showing the mounting plate 40 and the locking body 60, FIG. 11 is a sectional view taken along line XI-XI in FIG. 10, and FIGS. 12 and 13 are parts showing the mounting plate 40 and the locking body 60. FIG. 14 is a rear view showing the mounting plate 40. 15 and 16 are perspective views showing the locking body 60, FIG. 17 is a front view showing the locking body 60, and FIGS. 18 to 22 are sectional views of the locking body 60 shown in FIG. 23 and 24 are exploded perspective views of the locking body 60, and FIG. 25 is an explanatory view showing a process of mounting the locking body 60 to the mounting member 22.

  The mounting plate 40 is provided with each locking body support portion 44 corresponding to each mounting member 22, and the locking body 60 is supported by each locking body support portion 44.

  The locking body 60 is formed of a linear body that can be elastically deformed. More specifically, the locking body 60 is formed by bending and deforming an elastically deformable metal wire, and a linear portion 61 to which the mounting member 22 can be locked, and one end portion of the linear portion 61. It has a U-shaped part 62 that turns back from the side. The U-shaped portion 62 includes an arc-shaped bent portion 62a that is folded back so as to draw a semicircular arc, and a fixed end portion 62b that extends linearly on one end side of the arc-shaped bent portion 62a. That is, the arc-shaped bent portion 62a is interposed between the linear portion 61 and the fixed end portion 62b and connects the two. The fixed end portion 62 b is shorter than the linear portion 61 and is in a parallel state with respect to the linear portion 61. That is, the locking body 60 is formed in a J shape as a whole. It should be noted that the linear portion 61 may be slightly bent as long as it is within a range in which an attaching operation of a locking body 60 described later can be performed. Further, the fixed end portion 62b and the linear portion 61 may be inclined.

  The locking body 60 is formed in a J-shape as a whole between the fixed end 62b fixed to the mounting plate 40 and the linear portion 61 locked by the locking body 60. This is because the provision of the easy arc-shaped bent portion 62a facilitates the displacement of the linear portion 61 when the mounting member 22 is locked.

  Moreover, the structure of the latching body latched to an attachment member is not restricted to the said example. For example, the structure which the single latching body bent in cyclic | annular form or U shape with respect to the some attachment member 22 may latch.

  Here, the locking body 60 is covered with a resin coating portion 64. The resin coating portion 64 includes a linear coating portion 65 that covers the linear portion 61, a fixed coating portion 66 that covers the fixed end 62b, and a bending coating portion 67 that covers the arc-shaped bending portion 62a. The linear covering portion 65, the fixed covering portion 66, and the bending covering portion 67 are integrally formed of resin so as to be bent in a J shape along the shape of the locking body 60.

  The linear covering portion 65 includes a semi-tubular portion covering the inside and both sides of the intermediate portion of the linear portion 61 and the arc-shaped bent portion 62a side, and outward of the linear portion 61 on one end side of the semi-tubular portion. It is made into the shape which has a tubular part which covers the whole outer periphery of an edge part.

  The fixed covering portion 66 is formed in a tubular portion that covers the entire outer periphery of the fixed end portion 62b, and its outer shape is formed in a prismatic shape. Further, a positioning projection 66 a having a contact surface 66 f facing the front end side of the fixed coating portion 66 is formed in a portion of the fixed coating portion 66 that is continuous with the bending coating portion 67.

  The bend covering portion 67 is formed in a shape that covers only the inner peripheral side of the arc-shaped bent portion 62a while bending along the arc-shaped bent portion 62a.

  Here, a pair of sandwiching pieces 68 are extended on the extension of the linear covering portion 65 in the bending covering portion 67, and a retaining projection 68 a is projected inside the pair of sandwiching pieces 68. ing. Then, the pair of sandwiching pieces 68 sandwich the arc-shaped bent portion 62a disposed along the outer periphery of the bent covering portion 67, and the retaining projection 68a contacts the outer peripheral side of the arc-shaped bent portion 62a. It is arranged at a possible position. As a result, the arc-shaped bent portion 62a is prevented from being pulled out, so that the combined state of the locking body 60 and the resin coating portion 64 is maintained.

  The resin covering portion 64 is attached to the locking body 60 as follows. That is, the linear portion 61 is inserted into the linear covering portion 65 along the longitudinal direction, and the fixed end portion 62b is inserted into the fixed covering portion 66 along the longitudinal direction (see FIGS. 23 and 24). When the linear portion 61 and the fixed end portion 62 b are completely inserted into the linear covering portion 65 and the fixed covering portion 66, the arc-shaped bending portion 62 a is disposed on the outer periphery of the bending covering portion 67. In the middle of the insertion, the arcuate bent portion 62a is brought into contact with the retaining projection 68a, and the pair of sandwiching pieces 68 are expanded. When the arc-shaped bent portion 62a exceeds the retaining projection 68a, the arc-shaped bent portion 62a is disposed between the pair of sandwiching pieces 68, and the retaining projection 68a is the outer periphery of the arc-shaped bent portion 62a. It arrange | positions in the position which can contact | abut to the side. Thereby, the retaining body 60 is prevented from being detached from the resin coating portion 64. In this way, the resin coating portion 64 is attached to the locking body 60.

  The resin coating portion 64 plays a role of suppressing the metal portion of the locking body 60 from directly contacting the mounting member 22 and the mounting plate 40. Thereby, the abnormal noise between the latching body 60, the attachment member 22, and the attachment plate 40 by vibration etc. is suppressed. Further, the mounting member 22 and the mounting plate 40 in the normal state are maintained in an electrically insulated state, and an on / off switch configuration for leveling the horn can be incorporated.

  When the locking body 60 is pushed and attached to the locking body support portion 44 along the linear portion 61, the linear portion 61 is disposed in a position where the mounting member 22 can be locked. It is supported by the stop support part 44.

  That is, the support step portion 44 s pressed so that each portion of the circular plate portion 42 of the mounting plate 40 corresponding to the mounting member 22 of the steering wheel 10 protrudes on the opposite side of the peripheral wall 48 with respect to the peripheral portion. Is formed. An attachment hole 43h through which the attachment member 22 can be inserted is formed in the support step 44s. Here, since a cylinder member 54 to be described later is fitted into the attachment hole 43h, the attachment hole 43h is set to a size that allows the attachment member 22 to be inserted in consideration of the thickness of the cylinder member 54. . Further, the mounting hole 43h is smaller than the outer peripheral portion of the body portion of the coil spring 25, and is preferably formed in a size capable of contacting the locking end portion 27. Here, the size of the mounting hole 43h refers to a size in consideration of the thickness of the cylindrical member 54 when the cylindrical member 54 is mounted.

  The locking body support portion 44 is provided adjacent to the pair of insertion holes 44a and 44b formed so as to sandwich the attachment hole 43h, and the attachment hole 43h, and the fixed end portion 62b of the distal end portion of the U-shaped portion 62 is provided. And a fixing portion 45 that can be inserted and fixed.

  Here, the pair of insertion holes 44a and 44b are orthogonal to the inner and outer direction of the mounting plate 40 (radial direction with respect to the center of the mounting plate 40) in the rising wall portion around the support step 44s. It is formed at a position sandwiched by the direction. Therefore, when the linear portion 61 is inserted into the pair of insertion holes 44 a and 44 b, the linear portion 61 of the locking body 60 crosses the mounting hole 43 h in a posture orthogonal to the inner and outer directions of the mounting plate 40. Arranged.

  The pair of insertion holes 44a and 44b are formed in a long hole shape in a direction intersecting with the linear portion 61 around the attachment hole 43h. Accordingly, the linear portion 61 of the locking body 60 can be displaced in the inner and outer directions of the mounting plate 40.

  As described above, the fixed portion 45 is provided at a position where the fixed end portion 62b is disposed in a state where the linear portion 61 is disposed so as to cross the mounting hole 43h. The fixing portion 45 forms an insertion hole 45a into which the fixed end portion 62b can be inserted in a part of the rising wall portion around the support step portion 44s, and positions the fixed end portion 62b inside the insertion hole 45a. It is formed by forming a possible groove 45b (see FIG. 11). The concave groove 45b extends along the longitudinal direction of the linear portion 61 arranged as described above, and the insertion hole 45a opens to the opposite side of the mounting hole 43h with respect to the concave groove 45b. .

  Then, while passing the linear portion 61 through the pair of insertion holes 44a and 44b, the fixed end portion 62b is inserted into the fixed portion 45 until the contact surface 66f of the fixed covering portion 66 contacts the peripheral edge of the insertion hole 45a. Push in (see FIG. 25). Then, the fixed end 62b is supported in a state in which the fixed end 45 is positioned in the insertion direction and the width direction. In this state, the linear portion 61 is disposed across the attachment hole 43h between the pair of insertion holes 44a and 44b.

  In addition, the positioning of the locking body 60 in the insertion direction is performed by attaching the inner peripheral portion of the U-shaped portion 62 of the locking body 60 or the tip side in the insertion direction of the locking body 60 in addition to the above configuration. You may implement | achieve by the structure etc. which press on the member provided in plate 40 grade | etc.,.

  In addition, a resin cylindrical member 54 is fitted in the mounting hole 43h. A flange portion 54a is formed on the outer periphery of one end portion of the cylindrical member 54, and one end portion of the cylindrical member 54 is fitted into the mounting hole 43h until the flange portion 54a contacts the outer periphery of the mounting hole 43h (FIG. 1). , See FIG. Further, on the outer periphery of the cylindrical member 54, an insertion groove 54b extending along the circumferential direction of the cylindrical member 54 is formed on the inner peripheral side of the pair of insertion holes 44a and 44b. It is disposed so as to cross the mounting hole 43h through the insertion groove 54b (see FIGS. 1 and 8). The cylindrical member 54 plays a role of suppressing the locking body 60 from coming into direct contact with the mounting plate 40. Thereby, the abnormal noise between the attachment member 22 and the attachment plate 40 by vibration etc. is suppressed. Further, the mounting member 22 and the mounting plate 40 in the normal state are maintained in an electrically insulated state, and an on / off switch configuration for leveling the horn can be incorporated. However, the cylindrical member 54 is not essential. That is, the cylindrical member 54 is a kind of cover that is an optional component that covers the inner peripheral edge of the mounting hole 43h and the periphery thereof. Here, the cylindrical member 54 is an insertion target of the mounting member 22 regardless of the presence or absence of the cylindrical member 54. A certain hole may be described as the attachment hole 43h.

  A configuration for securing the locking body 60 to the side opposite to the insertion direction will be described.

  That is, a restriction piece insertion hole 47 h is formed in the mounting plate 40. More specifically, a restriction piece insertion hole 47h is formed at a position away from each insertion hole 45a along the peripheral direction of the mounting plate 40. Here, the restricting piece insertion hole 47h is formed in an arcuate hole shape along the peripheral edge of the circular plate portion 42 of the mounting plate 40, but this is not essential.

  A restricting piece 39 protrudes at a position corresponding to each restricting piece insertion hole 47 h in the opening side peripheral edge of the standing wall 38. The restricting piece 39 has an arcuate piece shape along the extending direction of the restricting piece insertion hole 47h, and is set to have the same length as the length of the restricting piece insertion hole 47h. But the restriction | limiting piece 39 should just be a shape which can be inserted in the restriction | limiting piece insertion hole 47h.

  Then, the opening side peripheral edge portion of the standing wall 38 is fitted into the peripheral wall 48 of the mounting plate 40, the restriction piece 39 is inserted into the restriction piece insertion hole 47h, and the other portion of the opening side peripheral edge portion of the standing wall 38 is the circular plate portion 42. It is made to contact with the inner surface. Then, the restricting piece 39 protrudes to a position on the outer peripheral side of the arcuate bent portion 62a of the locking body 60 in the mounting plate 40. As a result, the restricting piece 39 is disposed at a position where it can contact the outer peripheral side portion of the arc-shaped bent portion 62a, and at least one side in the longitudinal direction of the linear portion 61 of the locking body 60 (here, the locking portion From the side opposite to the direction in which the body 60 is inserted, the retaining body 60 is prevented from being removed.

  Further, a cover fixing piece 47ha projects from the peripheral edge of the restriction piece insertion hole 47h. Here, a cover fixing piece 47ha is projected from the longitudinal intermediate portion on the outer peripheral side of the restriction piece insertion hole 47h. Further, a cover fixing hole 39h is formed at a position corresponding to the cover fixing piece 47ha in a state where the restricting piece 39 is inserted into the restricting piece insertion hole 47h. The cover 36 and the mounting plate 40 are fixed by the cover fixing piece 47ha being disposed in the cover fixing hole 39h in a state where the restricting piece 39 is inserted into the restricting piece insertion hole 47h as described above. . In the present embodiment, in addition to the three restricting pieces 39, a cover fixing piece 39d having the same configuration as the restricting piece 39 is provided. Further, a cover fixing piece insertion hole 47d having the same configuration as that of the restriction piece insertion hole 47h is formed in the mounting plate 40 at a position corresponding to the cover fixing piece 39d (see FIGS. 7 and 8). The cover fixing piece 39d also has a role of fixing the cover 36 and the mounting plate 40. The cover 36 and the mounting plate 40 may be fixed by screwing, rivet fixing, or the like.

  Note that the position restriction of the locking body 60 in the insertion direction may be performed by a restriction piece separately provided on the standing wall 38 as described above.

  Further, it is not always necessary to restrict the position of the restricting piece 39 in a state in which the restricting piece 39 is inserted into the restricting piece insertion hole 47 h formed in the mounting plate 40. The restricting piece may protrude from the outer peripheral side of the mounting plate with respect to the mounting plate so as to position the locking body. In addition, a configuration that prevents the locking body 60 from being removed by the restriction piece 39 is not essential. The retaining member 60 may be prevented from being removed by attaching another retaining member to the attachment plate 40.

  The airbag device 30 is attached to the steering wheel 10 as follows.

  That is, the mounting members 22 provided with the coil springs 25 are prepared. At this time, the locking end 27 of the coil spring 25 is locked to the locking projection 24 from the proximal end side of the mounting member 22, and the coil spring 25 is compressed so as not to protrude toward the distal end side of the mounting member 22. Keep it.

  In the above state, the locking projection 24 extends on the tip side of the coil spring 25. For this reason, the latching protrusion 24 can be inserted into the mounting hole 43h (more specifically, into the cylindrical member 54) while preventing the coil spring 25 from interfering. That is, the airbag device 30 is further pushed toward the steering wheel 10 so that the attachment member 22 is inserted deeply into the attachment hole 43h. Then, the inclined surface 22 a of the mounting member 22 is pressed against the linear portion 61 of the locking body 60. Thereby, the linear part 61 is bent inside the attachment member 22 centering on the U-shaped part 62 (refer FIG. 28). The locking end 27 of the coil spring 25 locked to the locking projection 24 from the base end side of the mounting member 22 is pressed against the mounting plate 40 and is compressed and deformed. When the linear portion 61 of the locking body 60 gets over the locking protrusion 24 of the mounting member 22, the linear portion 61 of the locking body 60 moves back to a position crossing the original mounting hole 43h, and It comes to be locked to the stop projection 24. Further, the mounting plate 40 and the mounting base 20 are urged away from each other by the elastic force of the coil spring 25 compressed and deformed between the mounting plate 40 and the mounting base 20. As a result, in a state where the mounting plate 40 and the mounting base 20 are biased away from each other, the locking body 60 is locked to the locking projection 24 from the base end side of the mounting member 22, and the airbag device 30 is It is attached to the steering wheel 10 (see FIGS. 26 to 27).

  In the above state, the stationary contact 21 on the mounting base 20 side is disposed at a position away from the support step 44s. When the airbag device 30 is pushed toward the steering wheel 10, the mounting plate 40 moves toward the steering wheel 10 against the urging force of the coil spring 25, and the fixed contact 21, the mounting plate 40, Touch. Thereby, the switch for a horn ringing circuit which uses the fixed side contact 21 as a contact on one side and the mounting plate 40 as a contact on the other side can be incorporated. That is, in a state where the airbag device 30 is attached to the steering wheel 10, the stationary contact 21 and the attachment plate 40 are in a non-contact state by the biasing force of the coil spring 25, and both are in a non-conductive state. Yes. When the driver pushes the cover 36 in this state, the mounting plate 40 is pushed toward the steering wheel 10 against the urging force of the coil spring 25. Thereby, it can comprise so that the fixed side contact 21 may contact the attachment plate 40 as a contact on the other side, both will be in a conduction | electrical_connection state, and a horn will sound.

  However, it is not necessary to incorporate a horn switch structure in this portion, and a horn switch may be incorporated in the surface portion of the cover 36.

  According to the mounting portion structure of the airbag device 30 configured as described above, the locking end portion 27 provided at the end portion of the body portion 26 of the coil spring 25 is attached to the locking protrusion 24 of the mounting member 22. 22 is configured so that it can be locked from the base end side thereof, so that the locking end 24 at the distal end of the coil spring 25 is engaged with the locking projection 24 before the mounting member 22 is inserted into the mounting hole 43h. It can be stopped. Therefore, when the attachment member 22 is inserted into the attachment hole 43h, the coil spring 25 is unlikely to get in the way, and the attachment member 22 can be easily inserted into the attachment hole 43h. From another point of view, since the locking end 27 of the coil spring 25 is locked to the locking protrusion 24 of the mounting member 22, the length dimension of the mounting member 22 or This eliminates the need to consider the length dimension of the coil spring 25. For this reason, the degree of freedom in design is improved, and it is easy to set the length of the coil spring 25 from the viewpoint of operating force.

  Further, when the mounting member 22 is inserted into the mounting hole 43h (more specifically, into the cylindrical member 54), the tip end portion of the coil spring 25 comes into contact with the peripheral portion of the mounting hole 43h via the cylindrical member 54 to engage the locking projection. It is separated from the portion 24 and is disposed between the mounting base 20 and the mounting plate 40 in a compressed state. As a result, the coil spring 25 can urge the mounting base 20 and the mounting plate 40 in a direction away from each other, and the locking state between the locking body 60 and the mounting member 22 can be maintained. It is possible to incorporate an on / off switch configuration for leveling.

  In particular, since the locking end portion 27 includes a portion that passes through the inside of the trunk portion 26 when viewed from the axial direction of the trunk portion 26, the portion can be reliably locked by the locking projection. Such a locking end 27 can be easily formed by bending the tip of the coil spring 25 as in the above embodiment.

{Modification}
In the above embodiment, the locking end portion may be formed in a shape that presses the body portion 26 against the proximal end side of the mounting member 22. Thereby, the trunk | drum 26 can be pressed down so that the coil spring 25 may not more reliably project to the front end side of the attachment member 22 by the latching end part.

  More specifically, in the first modification shown in FIGS. 29 and 30, the locking end portion 27 </ b> B corresponding to the locking end portion 27 is bent so as to pass through the inner peripheral portion of the body portion 26. . Further, the distal end portion 27Ba of the locking end portion 27B extends so as to protrude outside the body portion 26. And the said front-end | tip part 27Ba presses down the trunk | drum 26. FIG.

  Thereby, it is suppressed more reliably that the trunk | drum 26 protrudes in the front end side of the coil spring 25 rather than the latching end part 27B.

  Moreover, in the said embodiment, in order to make a latching edge part press stably with respect to the attachment plate 40, it is good to do as follows.

  That is, in the second modification shown in FIGS. 31 to 33, the locking end portion 27 </ b> C corresponding to the locking end portion 27 includes a portion 27 </ b> Ca bent so as to pass through the inner peripheral portion of the body portion 26. Yes. In addition, the portion 27Cb on the front side of the portion 27Ca in the locking end portion 27C is eccentric from the trunk portion 26 on the opposite side to the protruding direction of the locking projection 24. That is, the central axis X2 of the portion 27Cb is shifted to the opposite side of the locking projection 24 in the protruding direction from the central axis X1 of the body 26. Accordingly, the eccentric portion 27 </ b> Cb is pressed against the mounting plate 40 via the cylindrical member 54 on the opposite side of the locking projection 24 in the protruding direction. Thereby, the eccentric portion 27Cb is stably pressed against the mounting plate 40 via the cylindrical member 54. Further, since the portion 27Cb is eccentric so as to shift to the opposite side of the protruding direction of the locking projection 24, a certain gap is formed between the mounting member 22 and the portion 27Cb. Therefore, when the portion 27Ca is locked to the locking projection 24, the portion 27Ca can be easily moved to the protruding direction side of the locking projection 24 so as to reduce the gap. Work can be done easily.

  34 and 35, the locking end portion 27D corresponding to the locking end portion 27 includes a portion 27Da bent so as to pass through the inner peripheral portion of the body portion 26. Yes. Further, the portion 27Db on the front side of the portion 27Da of the locking end portion 27D is eccentrically located on the opposite side to the protruding direction of the locking projection 24 with respect to the barrel portion 26, and further has a larger radius of curvature than the barrel portion 26. It is bent to draw.

  Therefore, the portion 27 </ b> Db that protrudes outward from the body portion 26 is pressed against the mounting plate 40 via the cylindrical member 54 by being formed with an eccentricity and a large curvature radius. Thereby, the portion 27Db is stably pressed against the mounting plate 40 via the cylindrical member 54. Even in this case, similarly to the above, when the portion 27Da is locked to the locking projection 24, the portion 27Da can be easily moved to the protruding direction side of the locking projection 24. Can be easily performed.

  In the third modification, the locking end portion 27D can also be formed by forming at least a part of the locking end portion at a radius of curvature larger than the barrel portion 26 without decentering the barrel end portion 26. The mounting plate 40 can be stably pressed through the cylindrical member 54.

  Further, as shown by a two-dot chain line in FIG. 31, the locking projection 24 can be locked by a portion 27Fa extending at the same radius of curvature as the eccentric portion 27Cb. In other words, the locking end portion that can be locked to the locking protrusion 24 may include a portion 27Fa that is eccentric so as to pass through the inside of the body portion 26.

  That is, the configuration in which the end portion of the coil spring 25 is locked to the locking protrusion 24 is a configuration in which at least a part of the end portion of the coil spring 25 is bent so as to cross the inside of the body portion 26, and the end portion of the coil spring 25 At least a portion of the coil spring 25 is eccentric so as to pass through the inside of the body portion 26, and at least a portion of the end of the coil spring 25 is formed with a smaller diameter than the body portion 26 so as to pass through the inside of the body portion 26. Etc., and a configuration having a plurality of combined parts.

  The configuration in which the body portion 26 is pressed by the end portion of the coil spring 25 can be realized by a configuration in which the distal end portion of the coil spring 25 extends so as to protrude outside the body portion 26.

  In addition, the configuration in which the coil spring 25 is stably pressed against the mounting plate 40 is a configuration in which at least a part of the end portion of the coil spring is decentered so as to pass through the outside of the body portion 26 when viewed from the axial direction of the body portion 26. Further, it can be realized by a configuration in which the diameter is larger than that of the body part 26 so as to pass outside the body part 26 when viewed from the axial direction of the body part 26.

  Further, when the end portion of the coil spring 25 is locked to the locking projection 24, the base end portion of the coil spring 25 is positioned on the opposite side of the protruding direction of the locking projection 24 due to uneven pressing by the locking projection 24. There is a risk of displacement (see arrow A in FIG. 36). Therefore, as in the fourth modification shown in FIG. 36, the position of the base end portion of the coil spring 25 is regulated at a position away from the base end portion of the mounting member 22 on the side opposite to the protruding direction of the locking projection 24. A position restricting protrusion 90 may be provided.

  Here, the position restricting projection 90 is provided on the mounting base 20 at a position separated from the base end of the mounting member 22 in the protruding direction of the locking projection 24 at the diameter dimension of the coil spring 25. ing. The position restricting protrusion 90 is formed in a protrusion shape whose height dimension gradually increases toward the mounting member 22, and the surface facing the base end of the mounting member 22 extends along the protruding direction of the mounting member 22. The contact surface 90a is formed.

  As a result, the position of the base end of the coil spring 25 is restricted so that the base end of the coil spring 25 is sandwiched between the base end of the mounting member 22, the outer peripheral surface, and the position restricting projection 90, and displacement of the base end of the coil spring 25 is suppressed. Has been. When the mounting member 22 is inserted into the mounting hole 43h, the coil spring 25 is difficult to fit into the mounting hole 43h (here, the cylindrical member 54). It can be surely arranged in a normal posture.

  Moreover, in the said embodiment and modification, the attachment member 22 is provided in the attachment plate 40 which is a 2nd fixing member, and the latching body 60 may be supported by the center member 16 which is a 1st fixing member.

  In addition, each structure demonstrated in the said embodiment and each modification can be suitably combined unless it mutually contradicts.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Steering wheel 16 Central member 22 Mounting member 23 Column part 24 Locking protrusion 25 Coil spring 26 Trunk part 27, 27B, 27C, 27D Locking end part 30 Airbag apparatus 32 Airbag 34 Inflator 36 Cover 40 Mounting plate 44 Locking Body support 60 Locking body 90 Position restricting projection

Claims (9)

An airbag device mounting structure for mounting an airbag device to a steering wheel,
A first fixing member provided on the steering wheel side;
An airbag device comprising: an airbag; an inflator capable of inflating and deploying the airbag; a cover covering the folded airbag; and a second fixing member to which the airbag, the inflator and the cover are fixed. When,
With
A mounting member projects from one side of the first fixing member and the second fixing member,
An attachment hole into which the attachment member can be inserted is formed on the other side of the first fixing member and the second fixing member, and an engaging body that can be engaged with the attachment member inserted into the attachment hole is provided. Provided,
The mounting member has a column portion protruding from the one side of the first fixing member and the second fixing member, and a locking protrusion formed at a tip portion of the column portion,
A coil spring arranged in a compressed state between the first fixing member and the second fixing member in a state where the locking member is locked to the mounting member inserted into the mounting hole. Fitted,
The coil spring includes a barrel portion that can be fitted onto the column portion, and a locking end that is provided on the distal end side of the barrel portion and includes a portion that can be locked to the locking projection from the base end side of the mounting member. A mounting structure for an airbag device, comprising: The airbag device mounting portion structure according to claim 1,
The locking end portion includes a portion passing through the inside of the trunk portion as viewed from the axial center direction of the trunk portion. The airbag device mounting portion structure according to claim 2,
The attachment part structure of an airbag apparatus including the part by which the said latching end part was bent so that the inner side of the said trunk | drum could be crossed seeing from the axial center direction of the said trunk | drum. The mounting structure of the airbag device according to claim 2 or claim 3,
The attachment portion structure of the airbag device, wherein the locking end portion includes a portion that is eccentric so as to pass through the inside of the trunk portion when viewed from the axial direction of the trunk portion. It is the attachment part structure of the airbag apparatus as described in any one of Claims 1-4,
The attachment part structure of the airbag apparatus, wherein the locking end part is formed in a shape that presses the body part against a base end side of the attachment member. The mounting structure of the airbag device according to claim 5,
The attachment part structure of an airbag apparatus including the front-end | tip part which the said latching end part extended so that it might see outside from the said trunk | drum, seeing from the axial center direction of the said trunk | drum. It is the attachment part structure of the airbag apparatus as described in any one of Claims 1-6,
The attachment portion structure of the airbag device, wherein the locking end portion includes a portion that is eccentric so as to pass outside the trunk portion as viewed from the axial direction of the trunk portion. It is the attachment part structure of the airbag apparatus as described in any one of Claims 1-7,
The attachment portion structure of the airbag device, wherein the locking end portion includes a portion formed to have a larger diameter than the trunk portion so as to pass outside the trunk portion as viewed from the axial direction of the trunk portion. It is the attachment part structure of the airbag apparatus as described in any one of Claims 1-8,
A position restricting projection for restricting the position of the base end of the coil spring between the first end of the first fixing member and the second fixing member and the base end of the mounting member is provided. Attachment structure of the bag device.

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