JP6351092B2 - 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 a steering wheel to which the airbag device is attached.

  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 device (airbag module) together with a housing or the like, and have an independent structure separate from the steering wheel. Since an ordinary airbag device 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 (support member in Patent Document 1) is provided on the lower surface of the airbag device, and a coiled horn spring is provided around the pin. It has been. The airbag device is elastically attached to the steering wheel by inserting the pin into a pin receiving hole or the like on the steering wheel side in a state where the pin and the horn spring are installed.

JP-A-9-161606

  Usually, as described in Patent Document 1, the airbag device is provided with a plurality of horn springs. However, the installation location of the horn spring varies depending on the specifications of the vehicle model and the size of the horn spring used is appropriately changed. In some cases, a plurality of horn springs having different diameters with different strengths may be provided for one airbag device. In such a case, it is necessary to select and assemble a horn spring having the correct diameter set for each pin. If a horn spring having a diameter different from the setting is assembled to a predetermined pin, the airbag device may not be able to perform the horn switch function correctly.

  In view of such a problem, an object of the present invention is to provide an airbag device capable of preventing erroneous assembly even when a plurality of horn springs having different diameters are assembled.

  In order to solve the above-described problems, a representative configuration of the present invention is an airbag device installed on a steering wheel of a vehicle, and includes a coiled horn spring and a lower surface of the airbag device on the steering wheel side. The spring installation area where the coil end of the horn spring is installed, the pin protruding from the center of the spring installation area through the inside of the horn spring toward the steering wheel, and the direction facing the spring installation area And a misassembly prevention portion that is provided on the outer periphery of the spring installation area and protrudes in the protruding direction of the pin from the spring installation area.

  According to the above configuration, the erroneous large-diameter horn spring having a large diameter that does not fit into the spring installation area around the pin is assembled across the spring installation area and the erroneous assembly prevention unit. Since the misassembly prevention part protrudes to the steering wheel side from the spring installation area, the large-diameter horn spring straddling both tilts. Due to the tilted attitude of the large diameter horn spring, the operator easily notices that the large diameter horn spring is an erroneous part that cannot be installed in the spring installation area. This prevents incorrect assembly of the horn spring.

  The spring installation region may be provided so as to be recessed from the lower surface, and the misassembly prevention unit may include an edge of the lower surface that circumscribes the outer periphery of the spring installation region. According to this structure, the edge part of the lower surface of the said airbag apparatus of the outer periphery of the recessed spring installation area | region functions as a misassembly prevention part.

  The erroneous assembly preventing portion may include one or a plurality of ribs that are circumscribed on the outer periphery of the spring installation region and protrude in the protruding direction of the pin from the lower surface. According to such a configuration, the outer peripheral rib of the spring installation region functions as an erroneous assembly preventing portion. Alternatively, when the spring installation region is recessed from the lower surface of the airbag device, the edge portion of the lower surface of the airbag device and the rib further protruding from the edge function as an erroneous assembly preventing portion.

  Spring installation area so that the large-diameter horn spring interferes with the pin when a large-diameter horn spring having a diameter that cannot be installed in the spring installation area is inclined over the spring installation area and the misassembly prevention part And a height difference between the misassembly prevention portion and the misassembly prevention portion.

  If there is only a slight difference in height between the spring installation area and the misassembly prevention section, the large-diameter horn spring has only a slight inclination, and the operator does not notice that the improper assembly has been made. There is a risk of assembling the spring. However, as described above, by providing a sufficient height difference between the spring installation area and the misassembly prevention part, the inclination of the large-diameter horn spring becomes noticeable and interferes with the pin. You will definitely notice the wrong assembly. In order to set such a difference in height, it is necessary to grasp a diameter and a length of a large-diameter horn spring that may be erroneously assembled.

  The rib may have an arc shape along the outer periphery of the spring installation region. This is because a large-diameter horn spring is easier to ride on an arc-shaped rib than a rib provided at a pin point.

  The pin may have a length that penetrates the horn spring. With such a long pin, it is the tip of the large diameter horn spring that first interferes with the pin when the large diameter horn spring is tilted. In other words, even if the degree of inclination is small, the large-diameter horn spring interferes with the pin, so that it is easy for the worker to notice that it is misassembled.

  The pin may have a spring fitting portion into which a horn spring installed in the spring installation region fits in the spring installation region. This is because the correct horn spring installed in the spring installation area is securely fixed to the airbag device.

  The horn spring has a wound coil portion and an end portion extending from the end of the coil portion to the inside of the coil portion, and the spring fitting portion is provided on the pin and the end portion of the horn spring is inserted. And a protruding portion protruding from one inner wall constituting the gap portion toward the other inner wall.

  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 to accommodate the front airbag, and a spring installation region is provided on the lower surface of the housing. It should be done. With this configuration, a front airbag device capable of preventing erroneous assembly of the horn spring can be suitably implemented.

  A representative configuration of a steering wheel device with an airbag according to the present invention includes any one of the airbag devices described above, a steering wheel of a vehicle to which the airbag device is attached, and a pin of the airbag device provided on the steering wheel. And a pin receiving hole to be inserted.

  According to the present invention, it is possible to provide a front airbag device capable of preventing erroneous assembly even when a plurality of horn springs having different diameters are assembled.

It is the figure which illustrated the front airbag apparatus concerning the embodiment of the present invention. It is the figure which illustrated the outline | summary of the airbag apparatus of FIG.1 (b). 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 each sectional drawing of the 1st pin of FIG. It is EE sectional drawing of the 2nd pin of FIG. FIG. 7 is a diagram illustrating a case where the second horn spring of FIG. 6 is installed on the first pin of FIG. 5. It is a figure corresponding to FIG.4 (b) which illustrates the 2nd Embodiment of this invention. It is a schematic diagram corresponding to Drawing 7 (a) which illustrates a 3rd embodiment of the present invention.

  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 a steering wheel device 100 with an airbag according to an embodiment of the present invention. FIG. 1A illustrates the entire steering wheel device 100 with an airbag. 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 protecting a driver, and includes a steering wheel 102 and a front airbag device 104 attached near the center thereof. ing. Of these, the front airbag device 104 also functions as a horn switch. Therefore, for example, a horn spring 142 (see FIG. 2B) is provided between the front airbag device 104 and the steering wheel 102, and the front airbag device 104 can be pushed down toward the steering wheel 102. It is possible.

  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 resin-made steering cover 110 is attached to the rear side of the steering wheel 102 that is opposite to the front airbag device 104.

  Two types of hooks are provided in a boss region 106 of the steering wheel 102 as a connection portion with the front airbag device 104. First, the main hooks 112 a and 112 b that are first hooks are hooks that fit into the housing 116 of the front airbag device 104 and support the front airbag device 104 on the steering wheel 102. The front airbag device 104 connected to the main hooks 112a and 112b cannot move in the X direction and the Y direction, but functions as a horn switch so that it can move slightly in the Z direction.

  The Z hooks 111a and 111b, which are the second hooks, are portions provided mainly to prevent the front airbag device 104 from falling off in an unexpected situation. The Z hooks 111 a and 111 b extend toward the lower surface 119 of the housing 116. The Z hooks 111a and 111b are housings when the front airbag device 104 moves in a direction away from the steering wheel 102 (coincides with the Z-axis direction), for example, when the airbag 114 (see FIG. 2A) is activated. 116 is caught. As a result, the Z hooks 111a and 111b prevent the front airbag device 104 from falling off the steering wheel 102.

  FIG. 2 is a diagram illustrating an outline of the front airbag device 104 of FIG. FIG. 2A is an exploded view of the front airbag device 104 of FIG. As illustrated in FIG. 2A, the front airbag device 104 includes a housing 116 that houses the folded 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 (first pins 140a and 140b and second pin 140c) are provided at three locations on the lower surface 119 of the base 117. Each pin protrudes toward the steering wheel 102 and is inserted into the pin receiving holes 144a to 144c of the steering wheel 102 (see FIG. 1B). Each pin has a structure divided into two parts, and can be bent slightly toward the center, thereby ensuring ease of insertion into the pin receiving hole 144a and the like. Further, a tapered surface 146 is provided at the outer diameter portion of the tip of each pin, and this tapered surface 146 also facilitates insertion into the pin receiving hole 140a and the like.

  The three pins include two types of pins having different sizes, and there are a total of two first pins 140a and 140b having the same size, and a second pin 140c having a slightly larger diameter than the first pins 140a and the like. One is provided. Each pin protrudes toward the steering wheel 102 through the inside of a coiled horn spring (the first horn springs 142a and 142b and the second horn spring 142c having a larger diameter than these). By inserting these pins into pin receiving holes 144a to 144c of the steering wheel 102 (see FIG. 1B), the front airbag device 104 is elastically mounted on the steering wheel 102 via a horn spring 142. .

  Since the first pins 140a and 140b and the second pin 140c have a divided structure and can be bent, the first pins 140a and 140b and the second pin 140c can be bent, so that they are running after being inserted into the pin receiving holes 144a to 144c (see FIG. 1B). Can absorb the vibration. Furthermore, the deflection of the first pins 140a, 140b and the second pin 140c widens the dimensional tolerance (shape tolerance) of each of these pins with respect to the pin receiving hole 140a, etc. It is also possible to match the shapes of the pin and the pin receiving hole 140a. Note that the number of divisions of each pin is not limited, and for example, each pin can be divided into three or more parts.

  Bar-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 Z hooks 111a and 111b 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 Z hooks 111a and 111b 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 ends 122a and 122b of the springs 120a and 120b, hook tabs 124a and 124b to which the main hooks 112a and 112b 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.

  A fitting portion 128 that is cut out in the Z direction is provided on the side surface of the hook tab 124b. The fitting portion 128 is a portion into which the main hook 112b (see FIG. 1B) is fitted. By providing the fitting portion 128 over the Z direction, the main hook 112b can move in the fitting portion 128 when the front airbag device 104 functions as a horn switch. Then, the main hook 112 b is hooked on the end of the fitting portion 128 on the free end 125 side, so that the front airbag device 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. The hook tab 124b is inclined in this manner, thereby enabling the main hook 112b to be connected to and released from the fitting portion 128. Further, the hook tab 124b also plays a role of mediating an operation of pushing and bending the spring 120b to remove it from the second hook when the front airbag device 104 is removed from the steering wheel 102.

  An operation for removing the front airbag device 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 main hook 112b to the fitting portion 128 and the hooking of the Z hook 111b 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 front airbag device 104, first, for example, the tool 180 is inserted into the opening 132b, and the hook tab 124b is bent with this tool 180 and tilted. By this operation, the hook tab 124b is detached from the main hook 112b, and the hook tab 124b further pushes and bends the spring 120b to avoid the Z hook 111b, whereby the front airbag device 104 can be detached from the steering wheel 102.

  Incidentally, in the front airbag device 104 of the present embodiment, as described with reference to FIG. 2B, two types of pins (first pins 140 a and 140 b and second pins) are provided on the lower surface 119 of the housing 116. 2 pins 140c) and horn springs (first horn springs 142a, 142b and second horn springs 142c) are provided. This configuration is in accordance with the specifications of the front airbag device 104 as a horn switch. Accompanying this configuration, in this embodiment, even when a plurality of horn springs having different diameters are assembled, a measure is taken to prevent erroneous assembly of the horn springs. Hereinafter, the components of the steering wheel device 100 with the airbag according to the present embodiment will be further described focusing on the configuration in the vicinity of the first pins 140a and 140b and the second pin 140c.

  FIG. 4 is a view illustrating the lower surface 119 of the housing 116 in FIG. 2B from another direction. FIG. 4A illustrates the lower surface 119 of the base 117 from the directly facing direction. FIG. 4B is a partially enlarged view of FIG. As illustrated in FIG. 4A, the two first pins 140a and 140b have the same configuration, and are respectively provided on the lower surface 119 of the housing 116 at the left and right ends on the vehicle front side (upper side in the drawing). Yes. One second pin 140c is slightly thicker than the first pin 140a and the like, and is provided at the center of the vehicle rear side (lower side in the figure) on the lower surface 119. By providing each pin at these three locations, the front airbag device 104 can be mounted on the steering wheel 102 with as few pins as possible. The number of pins and the number of types are not limited. For example, it is possible to provide four or more pins or three or more types of pins.

  The first pin 140b will be described as a representative of each pin. As illustrated in FIG. 4B, a spring installation region 151 is provided around the first pin 140b. As shown in the figure, two ribs 152a and 152b are provided so as to circumscribe the outer periphery of the spring installation area 151 when viewed from the direction facing the spring installation area 151. 5 is a cross-sectional view of the first pin 140b of FIG. 4A, and FIG. 5A is a cross-sectional view of the first pin 140b of FIG. FIG. 5 (b) is an enlarged view of a C portion in FIG. 5 (a). As illustrated in FIG. 5B, the first horn spring 142b includes a wound coil portion 143 and a terminal portion 156 extending from the end of the coil portion 143 to the inside of the coil portion. The first horn spring 142b has an outer diameter Φ1. In the spring installation area 151, a coil end of the first horn spring 142b is installed.

  As illustrated in FIG. 5B, the spring installation region 151 is recessed from the surroundings. That is, the spring installation area 151 is recessed from the lower surface 119 of the housing 116.

  A protrusion 154 is provided in the vicinity of the base of the first pin 140 b and in the gap 153. The protruding portion 154 protrudes from one inner wall constituting the gap portion 153 toward the other inner wall. The gap portion 153 and the protruding portion 154 function as a spring fitting portion. That is, the end portion 156 of the first horn spring 142b is inserted into the gap portion 153, gets over the protruding portion 154 and fits below the first portion, so that the first horn spring 142b does not fall off the first pin 140b. Thus, the correct first horn spring 142b installed in the spring installation area 151 is securely fixed to the airbag device 104.

  FIG. 5C is a DD cross-sectional view of the first pin 140b of FIG. As illustrated in FIG. 5C, the ribs 152a and 152b are provided so as to rise from the edge of the spring installation region 151, and the first horn spring 142b can be supported from the outer diameter side. .

  6 is a cross-sectional view taken along line EE of the second pin 140c of FIG. As illustrated in FIG. 6, there is a recessed spring installation region 159 also around the second pin 140c. The second horn spring 142c has an outer diameter Φ2 larger than the outer diameter Φ1 (FIG. 5B) of the first horn spring 142b. Two ribs 160 a and 160 b around the second pin 140 c are provided so as to circumscribe the spring installation region 159. The ribs 160a and 160b are provided so as to rise from the end of the spring installation region 159, and support the second horn spring 142c from the outer diameter side thereof.

  Here, reference is again made to FIG. The second horn spring 142c is a coil spring that supports the housing 116 at a central point on the vehicle rear side of the housing 116. Therefore, the second horn spring 142c has a larger outer diameter and stronger elastic force than the first horn spring 142b. Yes. However, since the second horn spring 142c does not have an extreme difference in appearance compared to the first horn spring 142b, the second horn spring 142c tries to fit the first pin 140b due to overlap of carelessness. In some cases. In that case, the ribs 152a and 152b and the spring installation region 151 described above function.

  FIG. 7 is a diagram illustrating a case where the second horn spring 142c of FIG. 6 is installed on the first pin 140b of FIG. FIG. 7A corresponds to the first pin 140b in FIG. As illustrated in FIG. 7A, when ribs 152a and 152b are provided around the first pin 140b, the second horn spring 142c is erroneously assembled to the first pin 140b. The second horn spring 142c having a large diameter does not enter the spring installation region 151 and interferes with the first ribs 152a and 152b. FIG. 7A illustrates a state in which the second horn spring 142c is assembled across the spring installation region 151 and the first rib 152b and tilted as a result of this interference. Thus, since the first ribs 152a and 152b function as an erroneous assembly preventing portion and the second horn spring 142c takes an inclined posture, the operator cannot install the second horn spring 142c in the spring installation region 151. Easily notice that it is a wrong part. Even if there is no height difference between the spring installation area 151 and the lower surface 119 of the housing 116, there is a height difference between the first ribs 152a, 152b and the spring installation area 151. Therefore, the first ribs 152a, 152b Functions as a misassembly prevention unit.

  As illustrated in FIG. 7A, the first pin 140b has a length penetrating the second horn spring 142c and the first horn spring 142b. According to such a long first pin 140b, it is the tip of the second horn spring 142c that first interferes with the pin when a large-diameter horn spring such as the second horn spring 142c is tilted. That is, even if the degree of inclination is relatively small, the second horn spring 142c interferes with the first pin 140b, and it becomes easy for the worker to notice that the assembly is incorrect.

  FIG. 7B is a diagram corresponding to the first pin 140b of FIG. FIG. 7B also shows that the second horn spring 142c is in an oblique posture. FIG.7 (c) is the G section enlarged view of FIG.7 (b). As illustrated in FIG. 7A, the end portion 162 of the second horn spring 142c does not fit into the protruding portion 154 because the second horn spring 142c assumes an oblique posture. Therefore, the worker can notice that the work is wrong due to the uncomfortable feeling at that time.

  Also, the fact that the spring installation area 151 is recessed more than the periphery (the lower surface 119 of the housing 116) is effective for preventing the second horn spring 142c from being erroneously assembled. That is, even if the first ribs 152a and 152b are not provided, the edge portion 164 of the recessed spring installation region 151 functions as an erroneous assembly preventing portion. As illustrated in FIG. 5B and the like, when the first horn spring 142b is correctly assembled to the first pin 140b, the first horn spring 142b fits in the spring installation area 151 properly. However, as illustrated in FIG. 7C, when the second horn spring 142c having a large diameter is mistakenly assembled to the first pin 140b, the second horn spring 142c contacts the edge 164. To do. Accordingly, the posture is also inclined by the edge portion 164, so that the worker can be aware that the work is erroneous.

  Note that, as illustrated in FIG. 6A, the outer diameter of the base portion 166 of the second pin 140c is provided at the base of the second pin 140c in an enlarged manner. Accordingly, if the first horn spring 142b of FIG. 5A is to be installed on the second pin 140c, the first horn spring 142b having a smaller outer diameter than the second horn spring 142c interferes with the base portion 166. Thus, the operator does not reach the spring installation region 159 and the posture becomes unstable, so that the worker can notice an erroneous operation.

  As described above, in the steering wheel device with an airbag 100, the ribs 152a, 152b, etc. and the spring installation area 151, etc., give a sense to the worker whether or not each horn spring is installed correctly. Can tell you. Thus, even when a plurality of horn springs having different diameters are assembled on the front airbag device 104, it is possible to prevent erroneous assembly of the horn springs.

  FIG. 8 is a diagram corresponding to FIG. 4B illustrating the second embodiment of the present invention. In FIG. 8, the same elements as those illustrated in FIG. 4B are denoted by the same reference numerals, description thereof is omitted, and only differences from FIG. 4B are described. In the second embodiment of FIG. 8, arc-shaped ribs 152 c along the outer periphery of the spring installation area 151 are used. This is because a large-diameter horn spring such as the second horn spring 142c is easier to ride on the arc-shaped rib 152c than the ribs 152a and 152b of FIG.

  FIG. 9 is a schematic diagram corresponding to FIG. 7A illustrating the third embodiment of the present invention. In FIG. 9, the second horn spring 142c is schematically shown as a rectangle. FIG. 9 illustrates a state in which the second horn spring 142c having an outer diameter Φ2 that cannot be installed in the spring installation region 151 is tilted, as in FIG. 7A. However, in FIG. 9, ribs 152d and 152e which are longer than the ribs 152a and 152b of FIG. 7A and have a large height difference H from the spring installation region 151 are used. As a result, the second horn spring 142c installed inclining across the spring installation areas 151 and 152e interferes with the first pin 140b at the point 182.

  If there is only a slight difference in height between the spring installation area 151 and the misassembly prevention portion such as a rib, the inclination of the large-diameter horn spring such as the second horn spring 142c is slightly generated. In such a case, the operator may not be aware that the wrong assembly has been performed, and the second horn spring 142c having a large diameter may be forcibly assembled to the spring installation region 151. However, by providing a sufficient height difference H between the spring installation region 151 and the ribs 152d and 152e as in the present embodiment, the inclination of the second horn spring 142c having a large diameter becomes significant as shown in FIG. Thus, the operator will be surely aware of the incorrect assembly because it interferes with the first pin 140b. In order to set the height difference H, the second horn spring 142c that may be erroneously assembled is assumed in advance, and the ribs 152d and 152e may be formed by grasping the outer diameter Φ2 and the length L thereof. .

  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 a steering wheel to which the airbag device is attached.

DESCRIPTION OF SYMBOLS 100 ... Steering wheel apparatus with an airbag, 102 ... Steering wheel, 104 ... Airbag apparatus, 106 ... Boss area | region, 108 ... Ring part, 110 ... Steering cover, 111a ... Z hook, 111b ... Z hook, 112a ... Main hook, 112b ... main hook, 114 ... airbag, 115 ... hole, 116 ... housing, 117 ... housing base, 118 ... cover, 119 ... bottom surface, 120a ... spring, 120b ... spring, 121 ... opening, 122a ... end, 124a ... Hook tab, 124b ... Hook tab, 125 ... Free end, 126 ... Fixed end, 128 ... Fitting part, 132a ... Opening part, 134a ... Opening part, 140a ... First pin, 140b ... First pin, 140c ... Second pin , 142a ... first horn spring, 142c ... first Horn spring, 143... Coil portion of the first horn spring, 144 a, 144 b, 144 c ... pin receiving hole, 146 ... taper surface, 151 ... spring installation area, 152 a, 152 b ... rib around the first pin, 153 ... gap 154... Projection, 156. Terminal portion of the first horn spring, 159... Spring installation area, 160 a and 160 b. Rib around the second pin, 162. ... Basic part of second pin, 180 ... Tool

Claims (9)

An airbag device installed on a steering wheel of a vehicle,
A coiled horn spring,
A spring installation area provided on the lower surface of the airbag device on the steering wheel side, where a coil end of the horn spring is installed;
A pin protruding from the center of the spring installation area through the inside of the horn spring toward the steering wheel;
A misassembly prevention portion that is provided on the outer periphery of the spring installation region as viewed from the direction facing the spring installation region, and that protrudes in the protruding direction of the pin from the spring installation region;
Equipped with a,
The spring installation area includes a first spring installation area and a second spring installation area,
The pin includes a first pin having a predetermined diameter protruding from the first spring installation region, and a second pin having a larger diameter than the first pin protruding from the second spring installation region,
The horn spring includes a first horn spring that is installed around the first pin, and a second horn spring that is thicker than the first horn spring and is installed around the second pin.
It said first pin and said second pin, an air bag device according to claim Rukoto which have a length which also penetrate any of the first horn spring and the second horn spring. The spring installation area is provided to be recessed from the lower surface,
The airbag device according to claim 1, wherein the erroneous assembly preventing portion includes an edge portion of the lower surface that circumscribes an outer periphery of the spring installation region.   The said misassembly prevention part is provided in the outer periphery of the said spring installation area | region, and includes the 1 or several rib which protrudes in the protrusion direction of the said pin rather than the said lower surface. The airbag apparatus as described in.   When a large-diameter horn spring having a diameter that cannot be installed in the spring installation area is installed to be inclined across the spring installation area and the misassembly prevention portion, the large-diameter horn spring interferes with the pin. The airbag device according to any one of claims 1 to 3, wherein a difference in height between the spring installation region and the erroneous assembly prevention portion is provided.   The airbag device according to claim 4, wherein the rib has an arc shape along an outer periphery of the spring installation region. Said first pin, said first spring providing area, have a first spring engaging portion where the first horn spring installed in the first spring providing area is fitted,
The second pin, the claims in the second spring providing area, characterized in that it have a second spring engaging portion, wherein the second second horn spring installed in the spring installation area is fitted The airbag device according to any one of 1 to 5 . The first horn spring and the second horn spring have a wound coil portion and a terminal portion extending from the end of the coil portion to the inside of the coil portion,
The first spring fitting portion includes a first gap portion that is provided on the first pin and into which a terminal portion of the first horn spring is inserted, and one inner wall that constitutes the first gap portion. a first protrusion protruding toward the other inner wall, only including,
The second spring fitting portion includes a second gap portion that is provided on the second pin and into which a terminal portion of the second horn spring is inserted, and one inner wall that constitutes the second gap portion. airbag apparatus according to the second protrusion protruding toward the other inner wall, to claim 6, characterized in containing Mukoto. 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 7 , wherein the spring installation region is provided on a lower surface of the housing. The airbag device according to any one of claims 1 to 8 ,
A steering wheel of a vehicle to which the airbag device is attached;
A pin receiving hole provided in the steering wheel and into which a pin of the airbag device is inserted;
A steering wheel device with an airbag, comprising:

Images