JPH0224709B2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) This invention is applicable to cases in which concave portions are formed by stealing flesh in a synthetic resin coating layer of spoke portions of a steering wheel body of an automobile, etc., in order to reduce weight. The present invention relates to a mounting structure for a lid that closes a recess.

(Prior Art) Conventionally, as shown in FIG. 5, for example, sink marks have been made on the back side of the synthetic resin covering layer 3b of the spoke parts 3 of the steering wheel body 1 in order to reduce weight, and on the covering layer 3b on the front side of the spoke part 3. In order to prevent this from occurring, recesses 4 have been formed. In order to improve the appearance of the concave portion 4 and the feel when gripping the spoke portion 3,
This recess 4 has been closed with a lid 7 made of synthetic resin.

To attach the lid 7, a plurality of caulking protrusions 5 are protruded from the spoke parts 3, a caulking hole 8 is formed in the corresponding position on the lid 7, and the caulking protrusion 5 is inserted into the caulking hole 8. was inserted, and the tips of the caulking protrusions 5 were caulked with heat or the like and attached to the back surface of the spoke portion 3.

Therefore, in the conventional installation of the lid body 7, the lid body 7 is attached by caulking one after another, so that after one caulking part is caulked, the caulking part of the other lid body 7 may become misaligned, and the steering wheel body 1 and The assembly accuracy is poor, making the caulking work difficult. In addition, the periphery of the caulking part of the other cover body 7 may be lifted up, and in this case, the caulking is done with a gap created between it and the steering wheel body 1, which may cause rattling or chattering noise while driving. was causing it.

(Object of the Invention) The present invention provides a structure in which a lid is attached to a recess formed in a synthetic resin covering layer of a spoke portion of a steering wheel body, and in which a lid is attached to a recess that corresponds to an inner peripheral surface of the recess and an outer peripheral edge of the lid. By providing a joint part, it is possible to temporarily fix the two parts by engaging them through the engaging part before the crimping process, and this eliminates the displacement of other crimped parts and the lifting of the outer periphery of the lid body, which conventionally occur during the crimping process. prevention, improve assembly accuracy, and facilitate caulking work, which is the assembly work.
Another object of the present invention is to provide a steering wheel lid mounting structure that can be firmly mounted while preventing rattling and chattering noise during driving.

(Structure of the Invention) The gist of the present invention is a structure in which a synthetic resin lid body is attached to a recess formed in a synthetic resin coating layer of a spoke portion of a steering wheel body, the inner circumferential surface of the recess being A plurality of caulking protrusions are formed on one side of the lid body, and a plurality of caulking holes are formed on the other side at corresponding predetermined positions, and a plurality of caulking protrusions are formed on the inner peripheral surface of the recess and the lid body at the outer peripheral edge position of the lid body. A plurality of mutually engageable engaging portions are formed, and the lid body is configured to engage with the recessed portion.
A steering wheel lid mounting structure, characterized in that the steering wheel lid mounting structure is mounted by temporary fixation by engagement of the engaging portions of both, and fixation by caulking between the caulking protrusion and the caulking hole. be.

(Example) Fig. 1 is a cross-sectional view showing a state in which a lid body is attached to a steering wheel body in an embodiment of the present invention, and Fig. 2 is a back view of a spoke portion with a lid body attached in the same embodiment. 3 is an enlarged end view of FIG. 1, and FIG. 4 is a sectional view showing another embodiment.

In the steering wheel body 11 of the embodiment shown in FIGS. 1 to 3, a spoke part core metal 13a is welded to a boss plate 20 that is connected to a steering shaft (not shown) via a boss, and a ring is attached to the end of the spoke part core metal 13a. A covering layer 13b made of a synthetic resin material such as PP is formed on the outer periphery of the spoke part core metal 13a and the ring part core metal 12a.
Spoke portions 13 and ring portions 12 are respectively formed by covering 12b, and when forming coating layers 13b and 12b, a lower cover 21 is integrally formed to cover the boss, boss plate 20, etc.

A recess 14 is formed on the back side of the covering layer 13b of the spoke part 13 in order to reduce the weight and to prevent sink marks from occurring on the covering layer 13b on the front side of the spoke part 13.

Two downwardly protruding caulking protrusions 15 are provided on the inner circumferential surface of the recess 14, and three concave engaging portions 16 that can be engaged with a lid engaging portion 19, which will be described later, are provided on the side wall. It is formed in places.

In order to improve the appearance of the back side of the spoke part 13 and the feel when gripping the spoke part 13,
A lid 17 is attached to the recess 14 to close it.

The lid body 17 is made of synthetic resin material such as PP,
Caulking holes 18, 18 corresponding to caulking protrusions 15, 15 protruding from the inner peripheral surface of the recess 14
is formed, and hook-shaped engaging parts 19, 19, 19 that can be engaged with the engaging parts 16 provided on the side walls of the inner circumferential surface of the recess 14 are formed on the outer peripheral edge. The circumferential edge of the caulking hole 18 is recessed so that the tip of the caulking projection 15 does not protrude toward the back side of the spoke portion 13 after the caulking projection 15 is caulked.

Therefore, when attaching the lid body 17 to the recess 14 of the steering wheel body 11, the recess 1
4 caulking protrusion 15 protruding from the inner circumferential surface;
The caulking holes 18, 18 of the lid body 17 are externalized to the 15, and the engaging portions 16, 1 in the recess 14 are
The lid 17 is attached to the steering wheel body 11 by engaging the engaging portions 19, 19, 19 of the lid 17 with the 6 and 16 and temporarily fastening them, and sequentially crimping the tips of the crimping protrusions 18 with heat or the like. be able to.

At that time, even if the tips of the caulking protrusions 18 are caulked one after another, the outer circumferential edge of the lid 17 engages the hook-shaped engaging part 19 with the concave engaging part 16 of the circumferential wall of the recess 14 so that the outer peripheral edge of the lid 17 is inside the recess 14. Because the position is fixed with the crimping, other crimped parts may shift during the crimping process.
Alternatively, it is possible to prevent the outer periphery of the lid body 17 from lifting up, improve the assembly accuracy, and facilitate the caulking work that is the assembly work, so that the lid body 17 can be firmly attached to the steering wheel body 11. Can be done. Furthermore, since the outer peripheral edge of the lid body 17 can be prevented from lifting, it is possible to prevent rattling after installation and generation of chattering noise during driving.

In the embodiment, a caulking protrusion 19 and a concave engaging portion 16 are provided on the steering wheel body 11 side, and a caulking hole 18 and a hook-shaped engaging portion 19 are provided on the lid body 17 side. However, as shown in FIG. 4, for example, a recess 24 is formed on the surface of the spoke portion 23.
, a caulking hole 25 and a hook-shaped engaging part 26 are provided on the spoke part 23 side, which is the steering wheel body side, and a caulking protrusion 28 and a concave engaging part 29 are provided on the lid body 27 side. It may be provided. By the way, when installing the lid body 27 in this way, the lid body 2
7 appears on the front side of the spoke portion 23, so if a desired color or pattern is applied to the lid body 27, the design effect of the steering wheel can be enhanced.

(Effects of the Invention) The steering wheel lid mounting structure according to the present invention includes a plurality of engaging portions that correspond to the inner peripheral surface of the recess of the covering layer of the spoke portion in the steering wheel main body and the outer peripheral edge of the lid, and the crimping operation is performed. It is possible to temporarily fix the two parts by engaging them beforehand, and it is possible to prevent the displacement of other caulked parts and the lifting of the outer periphery of the lid body, which conventionally occur during caulking work, improving the assembly accuracy and improving the assembly process. It is possible to easily carry out the caulking work, which is the attachment work, and to prevent rattling after attachment and chattering noise during driving, and to firmly attach the cover body to the steering wheel body.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a state in which a lid body is attached to a steering wheel body according to an embodiment of the present invention, FIG. 1 is an enlarged end view, FIG. 4 is a sectional view showing another embodiment, and FIG. 5 is a sectional view showing a conventional mounting state. 1, 11...Steering wheel body, 5, 1
5, 28... Protrusion for caulking, 7, 17, 27... Lid body, 8, 18, 25... Hole for caulking, 16, 1
9, 26, 29...Engaging portion.

Claims (1)

[Claims] 1 A structure in which a synthetic resin lid body is attached to a recess formed in a synthetic resin coating layer of a spoke portion of a steering wheel body, and a caulking protrusion is provided on the inner circumferential surface of the recess and one of the lid body. On the other hand, a plurality of caulking holes are formed at predetermined positions corresponding to each other, and an engaging portion that can be engaged with each other is formed on the inner peripheral surface of the recess and the lid body at an outer peripheral edge position of the lid body. Each is formed in multiple numbers,
The lid body is attached to the recessed portion by temporary fixation by engagement of the engaging portions of both, and fixation by caulking with the caulking projection and the caulking hole. Features a steering wheel lid mounting structure.