JP6189196B2 - Airbag device and steering wheel device with airbag - Google Patents

Description

  The present invention relates to an airbag device installed on a steering wheel of a vehicle and a steering wheel device with an airbag including the airbag device and a steering wheel.

  In recent vehicles, a front airbag is often installed at the center of the steering wheel on the passenger side. The front airbag is a safety device that operates in an emergency such as a vehicle collision, and is inflated and deployed by gas pressure to receive and protect an occupant from a forward collision. In general, the front airbag is housed by being folded in a small housing together with an inflator for supplying gas, and is further covered with a cover.

  Many of the front airbags described above constitute an airbag module together with a housing or the like, and have an independent structure separate from the steering wheel (for example, Patent Document 1). Since a normal airbag module also functions as a horn switch used for horn operation, it is installed in a form that can be pushed down with respect to the steering wheel. As a structure for that purpose, for example, as described in Patent Document 1, a pin (stepped bolt in Patent Document 1) and a horn spring provided around the pin (Patent Document 1) are provided on the lower surface side of the airbag module. A compression coil spring inside is provided. The airbag module is elastically installed with a pin inserted into a pin receiving hole on the steering wheel side and a horn spring interposed between the airbag module and the steering wheel.

JP-A-9-142244

  In recent years, a vehicle having a compact configuration has been demanded, and the structure of the above-described airbag module and the like has been developed with the goal of further simplification. For example, if the horn spring can be installed with a simpler structure and simple operation, it is very advantageous in terms of manufacturing cost and work labor. However, since the horn spring has elasticity and is repeatedly compressed and released after use, it is also necessary to achieve reliable maintenance of the attached state.

  In view of such problems, an object of the present invention is to provide an airbag device and a steering wheel device with an airbag that can fully attach a horn spring with a simple configuration.

  In order to solve the above problems, a representative configuration of an airbag apparatus according to the present invention is an airbag apparatus installed on a steering wheel of a vehicle, and is provided at a predetermined position of the airbag apparatus. A pin protruding to the side, a gap portion dividing the pin into at least two parts from the tip of the pin toward the base, and a protrusion protruding from one divided surface of the two divided pins toward the other divided surface , One or more ribs protruding from the outer peripheral surface of the pin opposite to one of the dividing surfaces, a wound coil portion, and a terminal portion extending from the end of the coil portion to the inside of the coil portion Of the horn spring, the coil portion is installed around the outer peripheral surface of the pin, the end portion is passed through the gap portion of the pin, and the rib is the horn spring core. Contact with the inner peripheral portion of the Le portions, protrusions, and which are located on the distal end side of the pin at the end portion near the horn spring.

  In the above configuration, ribs are provided on the outer peripheral surface of the pin so as to contact the inner peripheral portion of the horn spring so that the horn spring does not move in the radial direction of the coil portion. And the protrusion part is provided in the division | segmentation surface of a pin in the terminal part vicinity of a horn spring. Therefore, the movement of the horn spring in the direction of coming off from the pin is prevented by the end portion interfering with the protrusion. Thus, in the above configuration, even if the pin has a simple configuration using the protrusion and the rib, it is possible to suitably prevent the horn spring from falling off.

  In the cross section in which the straight line connecting the contact point of the rib with the horn spring and any one point on the tip of the protrusion includes the straight line in the plane and extends in the protruding direction of the pin, the end portion of the horn spring from the contact point It is better to be longer than the shortest distance to reach. With this configuration, the end portion of the attached horn spring reliably interferes with the protrusion of the pin. Accordingly, it is possible to more suitably prevent the horn spring from falling off the pin.

  A plurality of the ribs may be provided. Since the plurality of ribs interfere with the inside of the coil portion, the movement of the horn spring with respect to the pin can be more suitably prevented.

  The plurality of ribs may have different amounts of protrusion from the outer peripheral surface of the pin. The plurality of ribs may have different inclination angles with respect to the outer peripheral surface of the pin. With these configurations, the position of the horn spring with respect to the pin (particularly the position at the center of the diameter) can be set to an arbitrary position. In addition, for example, by appropriately setting the protrusion amount and the inclination angle of each rib, the end portion can be configured such that when the horn spring is attached to the pin, the horn spring assumes a predetermined posture or is guided to a predetermined track. It is also possible to make it easier to fit under the protrusion.

  The airbag device further includes a housing that is box-shaped and has a lower surface facing the steering wheel and an opening facing the occupant side to accommodate the front airbag, and the pin is provided on the lower surface of the housing. Also good. With this configuration, a pin that can prevent the horn spring from falling off can be suitably implemented.

  In order to solve the above-described problems, a typical configuration of a steering wheel device with an airbag according to the present invention includes a steering wheel device with an airbag including a vehicle steering wheel and an airbag device that also functions as a horn switch. A pin provided at a predetermined position of the airbag device and projecting toward the steering wheel, a gap portion dividing the pin into at least two parts from the tip of the pin toward the root, and a pin divided into two A protrusion projecting from one split surface toward the other split surface, one or more ribs projecting from the outer peripheral surface of the pin on the opposite side of the one split surface, a wound coil portion, A horn spring having an end portion extending from the end of the coil portion to the inside of the coil portion, and a pin of the airbag device provided on the steering wheel A pin receiving hole to be inserted, wherein the coil portion of the horn spring is installed around the outer peripheral surface of the pin, the end portion is passed through the gap portion of the pin, and the rib is the coil portion of the horn spring. The protrusion is in contact with the inner peripheral portion and is provided on the tip end side of the pin in the vicinity of the end portion of the horn spring.

  Also in the steering wheel device with an air bag having the above-described configuration, the horn spring attached to the pin prevents the coil portion from moving in the radial direction by contacting the rib to the inner peripheral portion of the coil portion, and the end portion has the horn spring. Movement in the direction of coming out of the pin is also prevented due to the interference of the protrusion. Therefore, even in the steering wheel device with an air bag, even if the pin has a simple configuration using the protrusion and the rib, it is possible to suitably prevent the horn spring from falling off.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the airbag apparatus which can fully attach a horn spring with a simple structure, and a steering wheel apparatus with an airbag.

It is the figure which illustrated the airbag apparatus and steering wheel apparatus with an airbag concerning embodiment of this invention. It is the figure which illustrated the outline | summary of the airbag module which is an airbag apparatus concerning embodiment of this invention. It is AA sectional drawing of Fig.1 (a). It is the figure which illustrated the lower surface of the housing of FIG.2 (b) from another direction. It is the figure which illustrated the state which attached the horn spring to the pin of Fig.4 (a). It is the elements on larger scale of the pin of FIG.5 (b). It is the figure which illustrated the pin of the comparative example corresponding to Drawing 6 (a). It is the figure which illustrated the modification of the pin of Fig.4 (a). It is the figure which illustrated the process of attaching the horn spring of Fig.8 (a).

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a diagram illustrating an airbag device (airbag module 104) and a steering wheel device 100 with an airbag according to an embodiment of the present invention. In the following drawings including FIG. 1A, the direction of the steering column (shaft) (not shown) is the Z-axis as the direction when the steering wheel device 100 with the airbag is attached to the vehicle. In the plane orthogonal to the Z-axis, the 9 o'clock to 3 o'clock direction is exemplified as the X-axis and the 6 o'clock to 12 o'clock direction as the Y-axis when the analog 12-hour timepiece is set to the vehicle front side.

  A steering wheel device 100 with an airbag shown in FIG. 1A is a device for steering a vehicle, and includes a steering wheel 102 that is a basic part of the vehicle and an airbag module 104 that is an airbag device that protects a driver. It is configured. Among these, the airbag module 104 is attached near the center of the steering wheel 102 and also functions as a horn switch. Therefore, for example, a horn spring 142 (see FIG. 2B) is provided between the airbag module 104 and the steering wheel 102, and the airbag module 104 can be pushed down toward the steering wheel 102. It has become.

  FIG.1 (b) is an exploded view of the steering wheel apparatus 100 with an airbag of Fig.1 (a). The steering wheel 102 shown in FIG. 1 (b) is made of a metal core, the center boss region 106 is exposed, and the ring portion 108 gripped by the driver is covered with resin. It has become. A steering cover 110 made of resin is attached to the rear side of the steering wheel 102 that is opposite to the airbag module 104.

  Two types of hooks are provided in a boss region 106 of the steering wheel 102 as a connection portion with the airbag module 104. First, the Z hooks 111a and 111b, which are first hooks, are hooks that fit into the housing 116 of the airbag module 104 and restrict the movable range thereof. The airbag module 104 is elastically mounted on the steering wheel 102 using a pin 140a (see FIG. 2B) and a horn spring 142, which will be described later. At that time, although the Z hooks 111a and 111b are fitted into the housing 116, the airbag module 104 cannot move in the X direction and the Y direction. However, in order to function as a horn switch, the airbag module 104 moves slightly in the Z direction. Is possible.

  The main hooks 112a and 112b, which are the second hooks, are portions provided mainly to prevent the airbag module 104 from falling off in an unexpected situation. The main hooks 112 a and 112 b extend toward the lower surface 119 of the housing 116. The main hooks 112a and 112b are used when the airbag module 104 moves in a direction away from the steering wheel 102 (coincides with the Z-axis direction), for example, when the front airbag 114 (see FIG. 2A) is inflated and deployed. It catches on the housing 116. As a result, the main hooks 112a and 112b prevent the airbag module 104 from falling off the steering wheel 102.

  FIG. 2 is a diagram illustrating an outline of an airbag module 104 which is an airbag device according to an embodiment of the present invention. FIG. 2A is an exploded view of the airbag module 104 of FIG. As illustrated in FIG. 2A, the airbag module 104 includes a housing 116 that houses the folded front airbag 114 and a cover 118 that closes the housing 116. The housing 116 and the cover 118 are made of synthetic resin.

  FIG. 2B is a perspective view of the lower surface 119 side of the housing 116 in FIG. First, the base portion 117 of the housing 116 has a box shape as a whole, and the lower surface 119 faces the steering wheel 102 side, and the opening 121 (see FIG. 2A) faces the occupant side. A hole 115 is provided substantially at the center of the lower surface 119 of the base 117, and an inflator (not shown) as a gas generator is attached to the hole 115. In addition, a horn switch terminal (not shown) or the like is also attached to the lower surface 119 of the base 117.

  In the present embodiment, pins 140 a to 140 c are provided at three locations on the lower surface 119 of the base portion 117. The pins 140a to 140c protrude toward the airbag module 104, and a horn spring 142 is installed around the pins 140a to 140c. By inserting the pins 140a to 140c into the pin receiving holes 144a to 144c of the steering wheel 102 (see FIG. 1B), the airbag module 104 is elastically attached to the steering wheel 102 via the horn spring 142. It is done.

  Further, rod-shaped springs 120a and 120b are attached to the lower surface 119 of the base 117 at two locations. The springs 120a and 120b are portions where the main hooks 112a and 112b are caught in the above-described unexpected situation. The springs 120a and 120b are formed by bending a metal rod into a predetermined shape, and have elasticity and can be bent. These springs 120a and 120b do not contact the main hooks 112a and 112b in a normal state. The springs 120a and 120b can be realized not only in a bar shape but also in a plate shape.

  In the vicinity of the end portions 122a and 122b of the springs 120a and 120b, hook tabs 124a and 124b to which the Z hooks 111a and 111b of the steering wheel 102 (see FIG. 1B) are directly fitted are provided. Since the hook tabs 124a and 124b have the same configuration, the structure will be described by taking the hook tab 124b as an example. The hook tab 124b is provided at a predetermined position on the side surface portion of the base portion 117 and extends in a plate shape toward the steering wheel 102 side. The hook tab 124b has a free end 125 on the steering wheel 102 side and a fixed end 126 connected to the base 117 at the root.

  Between the free end 125 and the fixed end 126 of the hook tab 124b, a fitting portion 128 that is cut out over a predetermined region in the Z direction is provided. In this embodiment, the fitting portion 128 is cut out to the extent that it reaches the opening 121 (see FIG. 2A) of the housing 116 on the fixed end 126 side on the hook tab 124b. The fitting portion 128 is located on a side surface portion of the housing 116 and is a portion to which the Z hook 111b (see FIG. 1B) is fitted. By providing the fitting portion 128 over the Z direction, the Z hook 111b can move in the fitting portion 128 when the airbag module 104 functions as a horn switch. Then, when the Z hook 111 b is hooked on the end of the fitting portion 128 on the free end 125 side, the airbag module 104 is prevented from falling off the steering wheel 102.

  Since the housing 116 is made of resin, the hook tab 124 b is also flexible, and can be bent and inclined toward the center side of the base portion 117 around the fixed end 126. By tilting the hook tab 124b in this way, the Z hook 111b can be connected to and released from the fitting portion 128. Further, the hook tab 124b also plays a role of mediating the operation of pushing and bending the spring 120b to remove it from the main hooks 112a and 112b as the second hooks when the airbag module 104 is removed from the steering wheel 102.

  An operation for removing the airbag module 104 from the steering wheel 102 will be described. FIG. 3 is a cross-sectional view taken along the line AA in FIG. The hook tab 124b can release both the fitting of the Z hook 111b to the fitting portion 128 and the hook of the main hook 112b to the spring 120b by one tilting operation.

  As illustrated in FIG. 3, openings 132 a and 132 b are provided in the steering wheel 102 at positions where the hook tabs 124 a and 124 b overlap. The steering cover 110 has openings 134a and 134b. These openings are gaps or openings for making the hook tabs 124a and 124b visible from the outside. When removing the airbag module 104, first, for example, the tool 180 is inserted into the opening 132b, and the hook tab 124b is bent with the tool 180 and tilted. By this operation, the hook tab 124b is detached from the Z hook 111b, and the hook tab 124b further pushes and bends the spring 120b to avoid the main hook 112b, whereby the airbag module 104 can be detached from the steering wheel 102.

  The pins 140a to 140c of the present embodiment are devised so that the horn spring 142 can be fully attached even with a simple configuration. Hereinafter, the components of the airbag module 104 and the steering wheel device 100 with the airbag according to the present embodiment will be further described focusing on the configuration of the pins 140a to 140c.

  FIG. 4 is a view illustrating the lower surface 119 of the housing 116 in FIG. 2B from another direction. In FIG. 4A, the lower surface 119 of the base portion 117 is viewed from the direction directly opposite thereto. The pins 140a to 140c are respectively provided at three positions on the lower surface 119 of the housing 116, the left and right ends on the front side of the vehicle (upper side in FIG. 4A) and the center on the rear side of the vehicle (lower side in FIG. 4A). Is provided. By providing the pins 140a to 140c at these locations, the airbag module 104 can be mounted on the steering wheel 102 with as few pins as possible. The number of pins is not limited, and for example, four or more pins can be provided.

  The structure of the pin 140b will be described as a representative of the pins 140a to 140c having a common structure. FIG. 4B is an enlarged perspective view of the pin 140b of FIG. As illustrated in FIG. 4B, the pin 140b is provided with a gap 150 from the tip to the base, and is divided into two parts (divided parts 152, 154). The pin 140b having such a divided structure can be easily inserted into the pin receiving hole 144b (see FIG. 1B) because the divided portions 152 and 154 can be bent so as to narrow the gap 150. .

  The divided structure of the pin 140b can absorb vibrations during traveling between the pin 140b and the pin receiving hole 144b (see FIG. 1B) by bending the divided portions 152 and 154. It is. Further, the bending of the respective divided portions 152 and 154 of the pin 140b widens the dimensional tolerance (shape tolerance) of the pin 140b with respect to the pin receiving hole 144b, and the pin 140b and the pin receiving hole 144b It is also possible to match the shapes. Note that the number of divisions of the pins 140b is not limited, and for example, the pins 140b can be divided into three or more parts.

  A tapered surface 146 is provided on the outer peripheral portion of the tip of the pin 140b. By providing the tapered surface 146, the pin 140b can be more easily inserted into the pin receiving hole 144b of the steering wheel 102 (see FIG. 1B).

  In the present embodiment, two ribs 158 and 160 are provided on the outer peripheral surface 156 constituting the outer periphery of the pin 140b so as to reach the lower surface 119 which is the installation surface of the pin 140b. The ribs 158 and 160 play a role of appropriately securing the rigidity of the pins 140b as their original functions. The moderate rigidity of the pin 140b is a rigidity that supports the airbag module 104 together with the horn spring 142, and that can be slightly bent and can be easily inserted into the pin receiving hole 144b and a buffer function. In addition, in the present embodiment, the ribs 158, 160 and the like further maintain a fully attached state of a horn spring 142 described later.

  Here, the horn spring 142 attached to the pin 140b will be described. The horn spring 142 is a so-called coil spring, and is a coil portion 162 wound mostly. The terminal portion 164 that is continuous with the end of the coil portion 162 on the lower surface 119 side of the housing 116 is bent from the end of the coil portion 162 and extends to the inside of the coil portion 162. When the horn spring 142 is attached to the pin 140b, the end portion 164 is passed through the gap 150, and the coil portion 162 is positioned around the outer peripheral surface 156 of the pin 140b.

  FIG. 5 is a diagram illustrating a state in which the horn spring 142 is attached to the pin 140b of FIG. FIG. 5A shows an enlarged view of the pin 140b from the same direction as FIG. As illustrated in FIG. 5A, the ribs 158 and 160 are in contact with the inner peripheral portion that is the inside of the coil portion 162 of the horn spring 142. A projecting portion 168 is provided on the dividing surface 166 that is one wall surface inside the gap portion 150. The protrusion 168 prevents the end portion 164 from falling off the gap 150.

  FIG.5 (b) is BB sectional drawing of the pin of Fig.5 (a). As illustrated in FIG. 5B, the protrusion 168 protrudes from the split surface 166 toward the other split surface 170 at a position on the distal end side of the pin 140 b in the vicinity of the end portion 164. When the horn spring 142 is about to come out of the pin 140b, the end portion 164 interferes with the protrusion 168. The rib 160 (and the rib 158 (see FIG. 5A)) described above is provided on the outer peripheral surface 156 of the pin 140b in order to surely cause the interference between the projection 168 and the end portion 164. .

  FIG. 6 is a partially enlarged view of the pin 140b of FIG. Fig.6 (a) is the C section enlarged view of the pin 140b of FIG.5 (b). As illustrated in FIG. 6A, the rib 160 (the same applies to the rib 158 (see FIG. 5A)) is a coil portion from the outer peripheral surface 156 on the opposite side of the dividing surface 166 provided with the protrusion 168. It protrudes toward the inner peripheral part of the inner side of 162 and is in contact with this inner peripheral part. Therefore, the horn spring 142 cannot move in the radial direction of the coil portion 162 (left-right direction in the figure). In addition, in the present embodiment, the rib 160 is brought into contact with the inner peripheral portion of the coil portion 162 so that the end portion 164 of the horn spring 142 can reliably interfere with the protrusion 168 of the pin 140b.

  The relationship between the protrusion 168 and the rib (typically the rib 160) in the present embodiment will be described in detail. FIG. 6B is an enlarged view of the pin 140b as seen from the protruding direction of the pin 140b, similarly to FIG. 5A. A contact P <b> 1 illustrated in FIG. 6B is a contact between the rib 160 and the horn spring 142. In the present embodiment, the distance (straight line L1) from the contact P1 to any one point (for example, the tip P2) of the tip of the projection 168 is equal to the contact P1 existing on the path of the straight line L1 in FIG. It is set to be longer than the straight line L2 (one point (point P3) on the terminal portion 164 from the contact point P1) that exemplifies the shortest distance from the terminal portion 164 (straight line L1> straight line L2).

  FIG.6 (c) is GG sectional drawing of FIG.6 (b). In FIG. 6B, the GG cross section is a cross section cut along a line segment extending in the same direction as the straight line L1. That is, FIG. 6C is a cross-sectional view including the straight line L1 in the plane and extending in the protruding direction of the pin 140b (longitudinal direction of the pin 140b). Also in the GG sectional view of FIG. 6C, a straight line L1 connecting the contact P1 and the tip P2 is a straight line L2 (point from the contact P1) that is the shortest distance from the contact P1 to the end portion 164. It can be seen that it is longer than P3) (straight line L1> straight line L2).

  Reference is again made to FIG. The protruding portion 168 and the rib 160 protrude from each other so that a straight line L1 (from the contact point P1 to the tip end P2) longer than the straight line L2 described above (from the contact point P3 to the point P3 on the end portion 164) can be formed at least at one place. Is provided. As a result, it is possible to reliably achieve the interference between the protrusion 168 and the end portion 164. In the present embodiment, the protrusions 168 and ribs 160 set in this way prevent the horn spring 142 from moving in the direction of coming out of the pin 140b.

  As described above, the pin 140b has a structure that prevents the horn spring 142 from falling off by the protrusion 168 and the rib 160 (and the rib 158). For example, FIG. 7 is a diagram illustrating a comparative pin corresponding to FIG. The pin 10 illustrated in FIG. 7A is not provided with the rib 160 of FIG. In the case where such a rib 160 is not present, the horn spring 142 can move slightly in the radial direction of the coil portion 162. For example, as illustrated in FIG. 7B, when the end portion 164 moves to the dividing surface 170 side, the end portion 164 may be out of the interference range with the protrusion 168. If such movement occurs, the horn spring 142 may fall off the pin 10.

  However, in the case of the pin 140b of this embodiment illustrated in FIG. 6A, the rib 160 (and the rib 158) interfere with the inner peripheral portion of the coil portion 162 of the horn spring 142. Therefore, the horn spring 142 cannot move such that the end portion 164 is detached from the protrusion 168. As described above, in this embodiment, the pin 140b has a simple configuration using the projection 168 and the ribs 158 and 160, but can prevent the horn spring 142 from dropping off.

(Modification)
FIG. 8 is a diagram illustrating a modification of the pin 140b of FIG. The pin 190 of the modified example illustrated in FIG. 8A includes two ribs 192 and 194 having different shapes. In particular, the rib 192 is longer along the pin 190 than the rib 194 and has a slightly gentle inclination angle with respect to the outer peripheral surface 156.

  FIG. 8B illustrates the pin 190 corresponding to FIG. As illustrated in FIG. 8B, the protruding amount of the rib 192 and the rib 194 from the outer peripheral surface 156 is different, and the protruding amount of the rib 192 is larger than that of the rib 194. Accordingly, the horn spring 142 attached to the pin 190 has a posture in which the center of the diameter is slightly moved toward the rib 192 side.

  FIG. 9 is a diagram illustrating a process of attaching the horn spring 142 of FIG. FIG. 9A corresponds to the arrow E in FIG. As illustrated in FIG. 9A, when the horn spring is attached to the pin 190, the horn spring 142 first contacts the rib 192 because the rib 192 is longer than the rib 194. Then, since this rib 192 contacts a position (right side in FIG. 9A) that deviates from the center of the diameter of the horn spring 142, the horn spring 142 assumes an oblique posture.

  FIG.9 (b) is FF sectional drawing of Fig.9 (a). As illustrated in FIG. 9B, when the horn spring 142 is inclined, the end portion 164 is also inclined and contacts the protrusion 168. Then, the end portion 164 comes into point contact with the protrusion 168, and the end portion 164 becomes easy to slide on the protrusion 168. Therefore, the end portion 164 can easily get over the protruding portion 168, and the ease of attaching the horn spring 142 is improved.

  Like the pin 190 described above, the lengths of the plurality of ribs, the inclination angle with respect to the outer peripheral surface 156 of the pins 140b and 190, and the protruding amount may be different. With such a configuration, the position of the horn spring 142 with respect to each pin (particularly the position of the diameter center) can be set to an arbitrary position. Further, for example, by appropriately setting the protruding amount of each rib, the horn spring 142 can be placed in an oblique posture or guided to a predetermined track when being attached to the pin. For example, it is possible to make the end portion 164 easier to fit into the protrusion 168 by generating a trajectory that twists the horn spring 142.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the embodiments described above are preferred examples of the present invention, and other embodiments can be implemented or performed in various ways. Can be carried out. The invention is not limited to the detailed shape, size, configuration, and the like of the components shown in the accompanying drawings unless otherwise specified in the present specification. In addition, expressions and terms used in the present specification are for the purpose of explanation, and are not limited thereto unless otherwise specified.

  Therefore, it is obvious for those skilled in the art that various changes and modifications can be conceived within the scope of the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  The present invention can be used for an airbag device installed on a steering wheel of a vehicle, and a steering wheel device with an airbag including the airbag device and the steering wheel.

L1 ... a straight line connecting the contact P1 and the tip P2, L2 ... a straight line connecting the contact P1 and the point P3 on the end portion, P1 ... a contact point between the coil portion of the horn spring and the rib, P2 ... 1 point, P3 ... 1 point on the end portion, 10 ... comparative pin, 100 ... steering wheel device with airbag, 102 ... steering wheel, 104 ... airbag module, 106 ... boss region, 108 ... ring part, 110 ... Steering cover, 111a, 111b ... Z hook, 112a, 112b ... Main hook, 114 ... Air bag, 115 ... Hole in the lower surface of the housing, 116 ... Housing, 117 ... Housing base, 118 ... Cover, 119 ... Housing base Lower surface, 120a, 120b ... spring, 121 ... housing 122a, 122b ... Spring ends, 124a, 124b ... Hook tabs, 125 ... Hook tab free ends, 126 ... Hook tab fixed ends, 128 ... Hook tab fittings, 132a, 132b ... Steering wheel openings, 134a, 134b ... steering cover opening, 140a-140c ... pin, 142 ... horn spring, 144a-144c ... pin receiving hole, 146 ... taper surface, 150 ... gap, 152, 154 ... pin split part, 156 ... Pin outer peripheral surface, 158, 160 ... rib, 162 ... coil portion of horn spring, 164 ... end portion of horn spring, 166, 170 ... split surface of pin, 168 ... projection, 180 ... tool, 190 ... of modification Pins, 192, 194 ... modified pin Rib of

Claims (7)

An airbag device installed on a steering wheel of a vehicle,
A pin provided at a predetermined location of the airbag device and protruding toward the steering wheel;
A gap that divides the pin into at least two parts from the tip of the pin toward the root;
A protrusion projecting from one split surface of the pin divided into two into the other split surface;
One or more ribs projecting from the outer peripheral surface of the pin opposite to the one split surface;
A horn spring having a wound coil portion and a terminal portion extending from the end of the coil portion to the inside of the coil portion;
With
Of the horn spring, the coil portion is installed around the outer peripheral surface of the pin, and the end portion is passed through the gap portion of the pin,
The rib is in contact with an inner peripheral portion of the coil portion of the horn spring;
The airbag device according to claim 1, wherein the protrusion is provided on a tip end side of the pin in the vicinity of a terminal portion of the horn spring.   In a cross section in which the straight line connecting the contact point of the rib with the horn spring and any one point on the tip of the protrusion includes the straight line and extends in the protruding direction of the pin, 2. The airbag device according to claim 1, wherein the airbag device is longer than a shortest distance to reach a terminal portion of the horn spring.   The airbag device according to claim 1, wherein a plurality of the ribs are provided.   The airbag device according to claim 3, wherein the plurality of ribs have different amounts of protrusion from the outer peripheral surface of the pin.   The airbag device according to claim 3 or 4, wherein the plurality of ribs have different inclination angles with respect to the outer peripheral surface of the pin. The airbag device further includes a housing that is box-shaped and has a lower surface facing the steering wheel side and an opening facing the occupant side to accommodate the front airbag,
The airbag device according to any one of claims 1 to 5, wherein the pin is provided on a lower surface of the housing. A steering wheel device with an airbag comprising a vehicle steering wheel and an airbag device that also functions as a horn switch,
A pin provided at a predetermined location of the airbag device and protruding toward the steering wheel;
A gap that divides the pin into at least two parts from the tip of the pin toward the root;
A protrusion projecting from one split surface of the pin divided into two into the other split surface;
One or more ribs projecting from the outer peripheral surface of the pin opposite to the one split surface;
A horn spring having a wound coil portion and a terminal portion extending from the end of the coil portion to the inside of the coil portion;
A pin receiving hole provided in the steering wheel and into which the pin of the airbag device is inserted;
Further comprising
Of the horn spring, the coil portion is installed around the outer peripheral surface of the pin, and the end portion is passed through the gap portion of the pin,
The rib is in contact with an inner peripheral portion of the coil portion of the horn spring;
The steering wheel device with an airbag, wherein the protrusion is provided on a tip end side of the pin in the vicinity of a terminal portion of the horn spring.

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