WO2017154571A1

WO2017154571A1 - Damper unit for airbag module and steering wheel

Info

Publication number: WO2017154571A1
Application number: PCT/JP2017/006502
Authority: WO
Inventors: 安部　和宏; 和隆杉本
Original assignee: タカタ株式会社
Priority date: 2016-03-07
Filing date: 2017-02-22
Publication date: 2017-09-14
Also published as: JP2017159696A

Abstract

Provided is a damper unit that effectively suppresses vibration transmitted from a body side, and that can reduce component costs. A steering wheel 1 is provided with a steering wheel main body 10, and an airbag module 3 attached to the steering wheel main body 10 via a horn plate 4 and a plurality of damper units 5. The damper units 5 each have a protector 47, a rubber bush 50, and a resin supporter 53. A coil spring 46 is interposed in a state of power storage between a core part 2 and a leg part 47d of each protector 47.

Description

Airbag module damper unit and steering wheel

The present invention relates to a damper unit for an airbag module and a steering wheel to which the airbag module is attached via the damper unit.

When vibration from the engine rotation or vibration from the road surface during travel is transmitted to the steering wheel that is fastened to the front end of the occupant side of the steering shaft, the vibration is transmitted to the driver who holds the steering wheel, causing discomfort to the driver. There was to give. Therefore, a technique for suppressing (vibrating) the vibration of the steering wheel has been conventionally proposed.

In Patent Document 1, a horn bracket fixed to a steering wheel, an inflator, an air bag module serving as a weight, provided between the air bag module and the horn bracket, and vibration of the steering wheel. A spring unit configured to transmit a vibration to the airbag module to form a dynamic damper, and the spring unit is attached to one of the elastic body that transmits vibration, the horn plate, and the airbag module. A synthetic resin protector that accommodates the elastic body in an elastically deformable manner, and a rotation restricting mechanism that is provided between the protector and the elastic body and restricts the rotation of the elastic body inside the protector. Steering wheel structure with an air bag module It has been described. The structure of Patent Document 1 has a large number of parts constituting the damper.

JP 2012-56460 A

The present invention provides a damper unit that can effectively suppress vibration transmitted from the vehicle body side and reduce the number of parts of the damper, and a steering wheel to which an airbag module is attached via the damper unit. Let it be an issue.

The damper unit of the present invention suppresses vibration transmitted from the steering shaft to the steering wheel. The damper unit includes a protector mounted in a damper unit mounting opening provided in a horn plate of the steering wheel main body or an air bag module retainer mounted on the steering wheel main body, and is inserted into and engaged with the protector. A cylindrical rubber bush, and a supporter that is inserted into and engaged with the rubber bush. The protector includes a ring-shaped flange portion on the rear side in the insertion direction to the damper unit mounting opening, a leg piece portion erected from the inner peripheral edge of the flange portion toward the distal end side in the insertion direction, and the leg piece And an engaging part that engages with an edge of the opening for mounting the damper unit.

In one aspect of the present invention, the engaging portion is a claw portion.

In one aspect of the present invention, the leg piece portions (47d) are provided at three locations in the circumferential direction of the flange portion (47a), and between the leg piece portions on the inner peripheral edge of the flange portion, In the same direction as the leg piece, a projecting piece (47c) to be inserted into the damper unit mounting opening is provided upright.

In one aspect of the present invention, the rubber bush is provided with a first protrusion (50a) protruding radially in the insertion direction front end side and a second protrusion (50b) protruding radially in the rear end side. ) Or flange portion (50d), and the first convex portion (50a) engages with the tip of the projecting piece portion (47c) of the protector (47, 47A), and the second convex portion The portion (50b) or the flange portion (50d) engages with the flange portion (47a) of the protector (47, 47A).

In one aspect of the present invention, the supporter (53, 53A) includes a ring-shaped flange portion (53a) that contacts the rear end surface of the rubber bush (50, 50A), and an inner peripheral edge of the flange portion (53a). A long leg piece portion (53c) that is erected and a claw portion (53d) provided on the distal end side of the long leg piece portion (53c) are provided, and the claw portion (53d) is a rubber bush (50 , 50A).

In one aspect of the present invention, the protector (47A) has a rod (47i) that is inserted into a small hole (4i) provided in the horn plate (4A).

In the steering wheel of one aspect of the present invention, a horn plate is attached to the cored bar portion (2) of the steering wheel main body through the plurality of damper units. An airbag module is attached to the horn plate. The protector of the damper unit is mounted in a damper unit mounting opening provided in the horn plate. Each damper unit (5, 5A) is attached to the core metal part (2) of the steering wheel body by a coil spring (46) and a shaft member (21). The shaft member (21) is inserted through the supporter (53, 53A). A tip end portion (21a) having a male screw of the shaft member (21) is screwed into a bolt hole (23) of the core metal portion (2). The supporter (53) faces the flange-shaped head (21b) on the rear end side of the shaft member (21). The supporter (53) is pressed against the head (21b) of the shaft member (21).

In the steering wheel according to another aspect of the present invention, the airbag module is attached to the cored bar portion (2) of the steering wheel body via the plurality of damper units. The protector of the damper unit is mounted in a damper unit mounting opening provided in a retainer (104) of the airbag module. Each damper unit (5, 5A) is attached to the core metal part (2) of the steering wheel body by a coil spring (46) and a shaft member (21). The shaft member (21) is inserted through the supporter (53, 53A). A tapered portion (21d) is provided at the tip of the shaft member (21). A groove (21e) is provided on the outer peripheral surface of the shaft member (21) adjacent to the tapered portion (21d). The shaft member (21) is inserted into the insertion hole (2b) provided in the core metal part (2). A lock spring (127) provided in the insertion hole (2b) is engaged with the groove (21e) of the shaft member (21). The supporter (53) faces the flange-shaped head (21b) on the rear end side of the shaft member (21), and the supporter (53) faces the head (21b) of the shaft member (21). It is pressed.

In one aspect of the present invention, the coil spring (46) is engaged with a notch step (47k) on the inner peripheral edge on the distal end side of the leg piece (47d).

According to the present invention, the damper unit can be composed of three points: a protector, a rubber bush, and a supporter, and the number of parts of the damper unit is small.

FIG. 1 is an exploded view of a steering wheel according to an embodiment. FIG. 2 is a view showing the back surface of the horn plate according to the embodiment. FIG. 3 is a sectional view of a damper unit portion of the steering wheel according to the embodiment. FIG. 4 is an exploded perspective view of the damper unit according to the embodiment. FIG. 5 is an exploded perspective view from the opposite direction of the damper unit. FIG. 6 is an exploded perspective view of a damper unit according to another embodiment. FIG. 7 is an exploded perspective view from the opposite direction of the damper unit of FIG. FIG. 8 is an exploded view of a steering wheel according to another embodiment. FIG. 9 is a perspective view of a steering wheel according to another embodiment. FIG. 10 is a cross-sectional view of a damper unit portion of a steering wheel according to another embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is an exploded view of the steering wheel according to the embodiment, FIG. 2 is a view showing the back surface (surface on the cored bar side) of the horn plate, FIG. 3 is a cross-sectional view of the damper unit portion, and FIG. , 5 are exploded perspective views of the damper unit.

The steering wheel 1 has an airbag module 3 attached to a substantially central portion of the steering wheel body 10. The steering wheel body 10 includes a wheel portion 11, a spoke portion 12, a cored bar portion 2, a horn plate 4, a damper unit 5 (FIGS. 3 to 5), and a horn switch mechanism 6 (FIG. 3).

The horn plate 4 is provided with three damper unit mounting openings 41 (FIGS. 3 to 5), and the damper unit 5 is engaged with each of the openings 41. The rubber bush 50 (FIGS. 3 to 5) of the damper unit 5 is disposed so as to be fitted onto the shaft member 21 via a resin supporter (resin bush) 53. A coil spring 46 is interposed between the resin supporter 53 of the damper unit 5 and the cored bar portion 2 in a power storage state. As shown in FIG. 3, the horn switch mechanism 6 is formed by a fixed contact 62 on the core metal part 2 side and a movable contact 61 of the horn plate 4. The horn plate 4 is configured to be movable along the shaft member 21, and the airbag module 3 is attached to the horn plate 4. The hub core part 2a of the cored bar part 2 is connected to the steering shaft.

The airbag module 3 includes an airbag that is inflated and deployed in an emergency, an inflator that supplies gas to the airbag, a retainer 31 that supports the airbag and the inflator, and a module cover 32 that covers the airbag, inflator and retainer 31. Have. About an airbag, an inflator, and the module cover 32, a well-known structure can be applied arbitrarily and it is not limited to the shape shown in figure.

In this embodiment, the airbag module 3 is fixed to the horn plate 4 by a snap-in structure. A claw portion 33 to be inserted into an opening 43 (FIGS. 1 and 2) formed in the horn plate 4 is formed at the bottom of the retainer 31. The claw portion 33 (FIG. 3) has a shaft portion and a return portion. When the return portion is inserted into the opening 43 of the horn plate 4, the bending spring 45 (FIG. 2) disposed on the horn plate 4 is returned to the return portion. And the bottom surface of the retainer 31.

For example, as shown in FIG. 2, the horn plate 4 is formed of an annular metal plate having a central opening 42 for inserting an inflator at the center. Two airbag module mounting openings 43 are formed at the left and right positions of the flat portion of the horn plate 4. The claw 33 of the airbag module 3 is inserted into the opening 43.

As shown in FIG. 2, a bending spring 45 is arranged so as to cross the opening 43. The bending spring 45 is composed of a metal rod formed in a substantially M shape, and the horn plate 4 is slidable in the direction of the arrow in FIG. 2 by a projection 44a and a hook 44b provided on the horn plate 4. Is held in.

A snap-in structure is formed by the opening 43 and the bending spring 45. When the claw portion 33 of the airbag module 3 is inserted into the opening 43, the bending spring 45 is pushed away in the direction of the arrow in FIG. 2 and slides, and when the return portion of the claw portion 33 exceeds the bending spring 45, the bending spring 45 45 is restored, and the claw 33 is engaged with the bending spring 45. Thereby, the airbag module 3 is fixed to the horn plate 4.

The damper unit 5 includes a protector 47 made of synthetic resin that engages with a damper unit engagement opening 41 of the horn plate 4, a resin supporter 53 that is externally fitted to the shaft member 21, and a rubber bush that is externally fitted to the supporter 53. 50 etc.

As shown in FIGS. 3 to 5, the protector 47 includes a ring-shaped flange portion 47a that overlaps the surface of the horn plate 4 (the surface on the airbag module 3 side), an annular wall portion 47b that rises from the outer periphery of the flange portion 47a, A plurality of projecting pieces 47c, leg pieces 47d, and the like rise from the inner peripheral edge of the flange portion 47a in the opposite direction to the annular wall portion 47b.

In this embodiment, the projecting piece portions 47c and the leg piece portions 47d are provided in three pieces, and are alternately arranged in the circumferential direction along the inner peripheral edge of the flange portion 47a. A claw portion 47e is erected in the radial direction from the front end side in the standing direction of the leg piece portion 47d. The standing height of the projecting piece 47c is lower than that of the leg piece 47d.

The annular wall portion 47b is provided with three window hole portions 47h so as to bite into the flange portion 47a. Each leg piece 47d faces the window hole 47h.

On the inner peripheral edge of the damper unit mounting opening 41 of the horn plate 4, a notch 41d into which the leg piece 47d enters is provided at a position equally divided into three in the circumferential direction. The protector 47 is attached to the horn plate 4 by causing the leg piece portion 47d to enter the cutout portion 41d and engaging the claw portion 47e with the edge portion of the cutout portion 41d. That is, the edge part of the opening part 41 of the horn plate 4 is clamped by the claw part 47e and the flange part 47a.

In this mounted state, the projecting piece 47c is in contact with the inner peripheral surface of the opening 41 to prevent the movement of the protector 47 in the radial direction. When the leg piece portion 47d is engaged with the cutout portion 41d, the protector 47 is prevented from rotating in the circumferential direction.

A notch step portion 47k is provided on the inner peripheral edge on the tip end side of the leg piece portion 47d, and the coil spring 46 engages with the notch step portion 47k.

The rubber bush 50 has a cylindrical shape and is inserted into the protector 47. A first convex portion 50a and a second convex portion 50b project from the one end side and the other end side of the rubber bush 50 in the cylindrical axis direction in the radial direction. Three each of the

convex portions

50 a and 50 b are provided at intervals in the outer circumferential direction of the rubber bush 50.

When the rubber bush 50 is inserted into the protector 47, as shown in FIG. 3, the first convex portion 50a engages with the tip of the projecting piece portion 47c of the protector 47, and the convex portion 50b on the other end side engages with the flange portion 47a. To do. As a result, the rubber bush 50 is integrated with the protector 47 so as not to move in the axial direction. In addition, since the 1st convex part 50a is located between

leg piece parts

47d and 47d, rotation to the circumferential direction of the rubber bush 50 is blocked | prevented.

The resin supporter 53 has a ring-shaped flange portion 53a, three long protruding piece portions 53b and a long leg piece portion 53c that rise from the front inner periphery of the flange portion 53a. In this embodiment, the long protrusion pieces 53b and the long leg pieces 53c are alternately arranged in the circumferential direction along the inner peripheral edge of the flange portion 53a. A claw portion 53d is erected in the radial direction from the front end side in the standing direction of the long leg piece portion 53c. Three small protrusions 53t are provided on the rear surface of the flange portion 53a.

The resin supporter 53 is inserted into the rubber bush 50 from the second convex portion 50b side (rear end side) toward the convex portion 50a side (front end side). The resin supporter 53 and the rubber bush 50 are integrated by engaging the claw portion 53d with the front end surface of the rubber bush 50 and sandwiching the rubber bush 50 between the claw portion 53d and the flange portion 53a. The long projecting piece 53b abuts against the inner peripheral surface of the rubber bush 50 and prevents the resin supporter 53 from moving in the radial direction.

The three convex parts 53e protrude from the outer periphery of the flange part 53a to the horn plate 4 side. When each convex part 53e enters between the

convex parts

50b and 50b of the rubber bush 50, rotation of the resin supporter 53 in the circumferential direction is prevented.

As shown in FIG. 3, the horn plate 4 is urged in a direction away from the cored bar part 2 by a coil spring 46 disposed in an accumulated state between the horn plate 4 and the cored bar part 2. One end of the coil spring 46 is in contact with the convex portion 22 of the cored bar 2, and the other end is in contact with the notch step 47 k at the tip of the leg piece 47 d of the protector 47.

The cored bar portion 2 is formed with a convex portion 22 at a position where the shaft member 21 is fixed, and the convex portion 22 is formed with a bolt hole 23 having a female screw. The convex portion 22 is formed to ensure the length of the bolt hole 23. When the core metal part 2 has a sufficient thickness, the convex part 22 may be omitted.

The shaft member 21 includes a columnar portion 21a, a flange-shaped head portion 21b provided at one end of the columnar portion 21a, and a bolt portion 21c protruding from the other end of the columnar portion 21a. The shaft member 21 is erected on the cored bar part 2 by screwing the bolt part 21c into the bolt hole 23. The shaft member 21 is disposed so as to pass through the damper unit 5 attached to the opening 41 of the horn plate 4. The coil spring 46 surrounds the columnar portion 21 a and is disposed between the convex portion 22 of the core metal portion 2 and the leg piece portion 47 d of the protector 47 as described above. The coil spring 46 urges the horn plate 4 via the protector 47 in a direction away from the cored bar 2 (upward direction in FIG. 3). When the horn plate 4 is pushed by the coil spring 46, the small protrusion 53t of the resin supporter 53 comes into contact with the head 21b.

The horn switch mechanism 6 is constituted by the movable contact 61 arranged on the horn plate 4 and the fixed contact 62 arranged on the cored bar 2. The fixed contact 62 is fixed to, for example, the top of the convex portion 24 formed on the cored bar portion 2, and is disposed at a height that can contact the movable contact 61 by the vertical movement of the horn plate 4. The arrangement of the movable contact 61 and the fixed contact 62 is not limited to the illustrated configuration. For example, the fixed contact 62 is fixed to the surface of the cored bar 2 and the movable contact 61 is extended downward from the rear surface of the horn plate 4. You may arrange.

The rubber bush 50 is made of rubber having a hardness according to a JIS K 6253 type A durometer of preferably 20 to 40, particularly about 25 to 35. As the rubber, for example, a synthetic rubber such as ethylene propylene diene rubber or chloroprene rubber is suitable.

The resin supporter 53 prevents the rubber bush 50 from coming into contact with the shaft member 21 and suppresses the abrasion of the rubber bush 50.

By depressing the airbag module 3, the horn plate 4 moves along the shaft member 21 in the direction of the cored bar 2 (downward), and the movable contact 61 and the fixed contact 62 come into contact with each other. Blow. At this time, the damper unit 5 disposed in the opening 41 also moves along the shaft member 21 together with the horn plate 4. When the pressing force of the airbag module 3 is released, the horn plate 4 is returned to the original position by the action of the coil spring 46.

The damper unit 5 is a dynamic damper that adjusts the vibration frequency of the airbag module 3, which is a mass body fixed to the horn plate 4, and cancels the vibration transmitted from the vehicle body side by the resonance of the airbag module 3. Function.

It is preferable that the three damper units 5 are arranged on the same circumference. Here, the arrangement position of the damper unit 5 refers to the center position of the substantially cylindrical rubber bush 50 of the damper unit 5, and corresponds to the center position of the shaft member 21. In a state where the steering wheel 1 is viewed facing the steering wheel 1, the center of the circle is located in the vicinity of the center of the annular wheel portion 11, in the vicinity of the center of gravity of the airbag module 3, or in an area between them. Is preferred. When the center of the wheel part 11 and the center of gravity of the airbag module 3 coincide, it is preferable that the center of the circle is located in the vicinity thereof. The arrangement interval (distance in the circumferential direction) of the damper unit 5 on the circumference of one circle may be the same or different.

In this embodiment, the diameter of this circle is preferably 80 mm or more and 110 mm or less, and particularly preferably 100 mm or less.

In general, the diameter (width) of the airbag module 3 of the steering wheel 1 is about 160 mm, and the damper unit 5 is located on the inner side (center side) from the middle point from the center of the airbag module 3 to the end of the airbag module 3. When arranged, the air bag module 3 is likely to rattle during horn operation, which may impair comfort. Therefore, it is preferable that the damper unit 5 is disposed outside (end side) from the middle point from the center of the airbag module 3 to the end of the airbag module 3, and the diameter of the circle is the diameter of the airbag module 3 ( Preferably, it is at least half of the width), that is, at least 80 mm.

As described above, the damper unit 5 functions as a dynamic damper that cancels the vibration transmitted from the vehicle body side by the resonance of the airbag module 3 and suppresses the vibration. The frequency of vibration transmitted from the vehicle body has a large component of 37 to 38 Hz, and the resonance frequency of the steering wheel 1 is preferably in this band.

According to the present embodiment, the damper unit 5 is configured by three points, that is, the protector 47, the resin supporter 53, and the rubber bush 50. Since the number of parts is small, the damper unit 5 can be reduced in size and the cost can be reduced. In addition, one-way assembly is possible, and it is only necessary to push in each part, and management of a fastening angle such as rotational fastening becomes unnecessary, and man-hours can be reduced.

A damper unit 5A according to another embodiment will be described with reference to FIGS.

6 and 7, the damper unit mounting opening 41A of the horn plate 4A is not provided with a notch 41d but is a perfect circle. The horn plate 4A is provided with a small hole 41i in the vicinity of the opening 41A. The other configuration of the horn plate 4A is the same as that of the horn plate 4.

The protector 47A is provided with a rod 47i that enters the small hole 41i. The rod 47i extends from the annular wall portion 47b toward the small hole 41i.

The leg piece portion 47d and the projecting piece portion 47c have their outer peripheral surfaces positioned at an equal radius with respect to the axis of the protector 47A. Other configurations of the protector 47A are the same as those of the protector 47, and the same reference numerals denote the same parts.

The rubber bush 50A is provided with a flange portion 50d on the rear end side, that is, on the rear end side in the insertion direction of the opening 41A, and a convex portion 50e is projected from the peripheral edge portion of the flange portion 50d. This convex part 50e is arrange | positioned in the circumferential direction 3 equal position of the periphery of the flange part 50d. The convex portion 50e protrudes in the radial direction from the flange portion 50d and protrudes rearward from the rear surface of the flange portion 50d.

On the outer peripheral surface of the rubber bush 50A between the flange portion 50d and the first convex portion 50a, a ridge 50c extending in a direction parallel to the axial center line direction of the rubber bush 50A is provided.

Other configurations of the rubber bush 50A are the same as those of the rubber bush 50, and the same reference numerals indicate the same parts.

The resin supporter 53A is not provided with the long protruding piece portion 53b, and only the long leg piece portion 53c is erected from the inner peripheral edge of the flange portion 53a. On the outer peripheral edge of the flange portion 53a, a convex portion 53f protruding only in the radial direction is provided at a position equally divided into three in the circumferential direction.

The other structure of the resin supporter 53A is the same as that of the resin supporter 53, and the same reference numerals indicate the same parts.

Similarly to the damper unit 5, the damper unit 5A has a leg piece 53c of the resin supporter 53A inserted in the rubber bush 50A, the claw 53d engages with the tip end surface of the rubber bush 50A, and the claw 53d and the flange. The rubber bush 50A is sandwiched between the portions 53a. The protrusion 53f enters between the

protrusions

50e and 50e, thereby preventing the resin supporter 53A from rotating in the circumferential direction.

The rubber bush 50A is inserted into the protector 47A in the same manner as the rubber bush 50, and the convex portion 50a is engaged with the tip of the protruding piece portion 47c. Further, the flange portion 50 d overlaps the flange portion 47 a of the protector 47. Thereby, the rubber bush 50A and the protector 47A are integrated.

The protector 47A is inserted into the opening 41A. At this time, the rod 47i is inserted into the small hole 41i, and the rotation of the protector 47A in the circumferential direction is prevented.

The shaft member 21 is inserted into the resin supporter 53A in the same manner as in FIG. 3, and a male screw-shaped tip 21a (not shown in FIGS. 6 and 7) is inserted into the bolt hole 23 (see FIG. 3) of the cored bar 2. Screwed. A coil spring 46 is interposed between the leg piece portion 47 d and the convex portion 22 of the cored bar portion 2.

Also in this embodiment, the damper unit 5A is composed of the protector 47A, the rubber bush 50A, and the resin supporter 53A, and the number of parts is small. Accordingly, it is possible to reduce the size.

In the above embodiment, a configuration in which the damper unit 5 is mounted in the opening 41 provided in the horn plate 4 and the bolt portion 21 c at the tip of the shaft member 21 is screwed into the bolt hole 23 of the core metal portion 2 is described. However, as shown in FIGS. 8 to 10, the airbag module 3 is attached to the steering wheel body 10 by a snap-in method, and an opening 141 (FIG. 10) provided in the retainer 104 of the airbag module 3 is provided. The damper unit 5 may be mounted.

The metal core part 2 has an insertion hole 2b of the shaft member 21, a lock spring 127, a steering shaft mounting hole 128, and the like. The lock spring 127 is substantially U-shaped, and is arranged so that one side crosses the insertion hole 2b in the chord direction. The lock spring 127 is inserted into the tunnel-shaped spring holder 130, positioned in contact with the

stoppers

131 and 132, and attached to the core metal part 2.

An inflator 142 and an airbag (not shown) are attached to the retainer 104, and the airbag is attached to the retainer 104 with a bolt 146 together with the inflator 142.

The tip end of the shaft member 21 is a tapered tapered portion 21d, and a groove 21e is provided around the outer peripheral surface adjacent to the tapered portion 21d. The rear end side of the groove 21e is a straight shape portion 21f, and a flange portion 21g is provided on the rear end side of the straight shape portion 21f.

In order to attach the airbag module 3 to the steering wheel body 10, the shaft member 21 is inserted into the insertion hole 2b. When the shaft member 21 moves forward, the lock spring 127 comes into contact with the tapered portion 21d. When the lock spring 127 passes through the tapered portion 21d, the lock spring 127 engages with the groove 21e, and the flange portion 21g abuts on the peripheral portion on the inlet side of the insertion hole 2b. Thereby, the shaft member 21 is fixed to the cored bar part 2, and the airbag module 3 can be attached to the steering wheel body 10.

The above embodiment is an example of the present invention, and the present invention may be other than the above.

Although the present invention has been described in detail using specific embodiments, it will be apparent to those skilled in the art that various modifications can be made without departing from the spirit and scope of the invention.
This application is based on Japanese Patent Application No. 2016-043522 filed on March 7, 2016, which is incorporated by reference in its entirety.

Claims

A damper unit that suppresses vibrations transmitted from the steering shaft to the steering wheel,
A protector mounted on a damper unit mounting opening provided in a horn plate of a steering wheel main body, or a retainer of an airbag module mounted on the steering wheel main body;
A cylindrical rubber bush that is inserted into and engaged with the protector;
A supporter inserted into and attached to the rubber bush,
The protector includes a ring-shaped flange on the rear side in the insertion direction to the opening for mounting the damper unit, a leg piece erected from the inner periphery of the flange portion toward the distal end in the insertion direction,
A damper unit having an engagement portion provided at a distal end portion of the leg piece and engaging with an edge portion of the opening for mounting the damper unit.
2. The damper unit according to claim 1, wherein the engaging portion is a claw portion.
In Claim 1 or 2, the leg piece part is provided at three places in the circumferential direction of the flange part,
The damper is characterized in that a projecting piece portion inserted into the damper unit mounting opening is erected in the same direction as the leg piece portion from between the leg piece portions on the inner peripheral edge of the flange portion. unit.
4. The rubber bush according to claim 3, wherein a first convex portion projecting radially is provided on the distal end side in the insertion direction, and a second convex portion or flange portion projecting radially is provided on the rear end side. And
The first convex portion engages with the tip of the protruding piece portion of the protector,
The damper unit, wherein the second convex portion or the flange portion is engaged with the flange portion of the protector.
5. The supporter according to claim 4, wherein the supporter includes a ring-shaped flange portion that abuts against a rear end surface of the rubber bush, a long leg piece portion erected from an inner peripheral edge of the flange portion, and the long leg piece portion (53c). ) And a claw portion provided on the tip side,
A damper unit characterized in that the claw portion engages with a tip of a rubber bush.
6. The damper unit according to claim 1, wherein the protector includes a rod inserted into a small hole provided in the horn plate.
A steering wheel in which a horn plate is attached to the cored bar portion of the steering wheel body through the plurality of damper units according to any one of claims 1 to 6, and an airbag module is attached to the horn plate. A wheel,
The damper unit protector is mounted in a damper unit mounting opening provided in the horn plate,
Each damper unit is attached to the core metal part of the steering wheel body by a coil spring and a shaft member.
The shaft member is inserted into the supporter, and a tip portion having a male screw of the shaft member is screwed into a bolt hole of the cored bar portion,
A steering wheel characterized in that the supporter faces the flange-shaped head portion on the rear end side of the shaft member, and the supporter is pressed against the head portion of the shaft member.
A steering wheel to which an airbag module is attached via a plurality of damper units according to any one of claims 1 to 6, with respect to a cored bar portion of a steering wheel body,
The damper unit protector is attached to a damper unit attachment opening provided in a retainer of the airbag module,
Each damper unit is attached to the core metal part of the steering wheel body by a coil spring and a shaft member.
The shaft member is inserted into the supporter, a tapered portion is provided at a tip portion of the shaft member, and a groove is provided on an outer peripheral surface of the shaft member adjacent to the tapered portion,
The shaft member is inserted into the insertion hole provided in the core metal part, and the lock spring provided in the insertion hole engages with the groove of the shaft member,
A steering wheel characterized in that the supporter faces the flange-shaped head portion on the rear end side of the shaft member, and the supporter is pressed against the head portion of the shaft member.
9. The steering wheel according to claim 7, wherein the coil spring is engaged with a notch step portion at an inner peripheral edge on a tip end side of the leg piece portion.