JPS6116202Y2 - - Google Patents

Description

[Detailed Description of the Invention] This utility model relates to a core bar for a steering wheel. A steering wheel with a pair of left and right spokes placed close to each other is said to be desirable in terms of design, as it does not obstruct the view of the meters, etc. However, such a steering wheel a has various structural problems. In other words, when a pair of left and right spokes b and b are arranged close to each other, when a load is applied to the center part c of the rim d on the side where no spokes are present, the connection between the spokes and the rim is stronger than the center part c. Since the distance l to point e is much larger than in the case of a steering wheel in which the left and right spokes are arranged far apart, the bending moment at joint e becomes excessive, causing damage near the welding point of the joint. is easily damaged. Moreover, when repeated loads are applied, the welded part becomes fatigued, resulting in even more rapid failure. Conventionally, in order to increase the fatigue durability of the welded part, as shown in Fig. 1, there is a welding method in which a T-shaped patch g is brought into contact with the welded part, but the The deformation due to the load applied to the center portion c on the opposite side is overwhelmingly larger than the deformation due to this load, and therefore the rim d may break near the outer end f of the T-shaped patch g. In order to prevent damage, it is possible to increase the thickness and length of the reinforcing T-shaped patch g, but doing so increases the weight and is not a good idea.

This invention was obtained as a result of intensive research in order to improve these conventional drawbacks.The outer ends of the spokes are expanded into a fan shape to increase the welding area, and the welding area is expanded to the outside of the pair of spoke cores. By making the length of the branching part of the reinforcing bracket longer than the length of other branching parts, the load applied to the rim part on the side where a pair of spokes that are close to each other are not present is reduced with only a slight increase in weight. This is intended to prevent deformation of the rim.

Regarding the attached drawings, to explain the embodiment, in FIG. cast,
The outer end is widened by header processing, and the fan-shaped part 3
The outer edge thereof abuts the inner circumferential edge of the rim core metal 4 and is welded as shown in 5. 6 is a reinforcing bracket that branches into three directions around the welding point,
The lower peripheral surface near the intersection of the spoke core metal and the rim core metal is covered as shown in FIG.
The length of the branch 6a of the reinforcing bracket extending outward is significantly greater than the length of the other branches 6b, 6c, and the branch 6b extends beyond the sector 3 of the spoke core 1 to the spoke core 1. The branch part 6c extends to the middle of the round bar part of the spoke core 1,
It extends inwardly by only about 1/5 of the length of the branch 6a. This reinforcing bracket 6 is welded to each spoke at key points.

The reason why the length of the branch portion of the reinforcing bracket 6c is set as described above is as follows. In other words, the load applied to the rim portion sandwiched between the spoke core metals 1, 1 does not result in a large bending moment because the distance from the load point to the joining point of the core metals is small, so the length of the branch portion 6c is It is not necessary to do so, and in fact, it is shortened to save weight, but the load applied to the opposite rim is significantly larger than the load point to the joint, so the bending moment is the square of the distance. Since it increases in proportion to
The length of the branch portion 6a is inevitably large. Further, the branch portion 6b extends beyond the fan-shaped portion 3 to the middle of the spoke core metal 1 mainly to increase the fatigue durability of the welded portion.

The above-mentioned core metal can be inserted into a mold, and an elastic coating layer can be formed on the core metal by injecting urethane stock solution using a RIM molding machine, foaming, and solidifying it. .

In Figures 4 and 5, instead of using a reinforcing bracket, the entire circumference of the reinforced area is covered with aluminum die-casting.This eliminates unevenness at the welding area, and the synthetic resin can be injection molded in the next process. When wrapping the core metal with a metal core, there is also the advantage that the synthetic resin flows better.

The present invention has the above-mentioned configuration, and in a steering wheel in which a pair of left and right spokes are arranged close to each other, the outer ends of the spoke core metals are expanded into a fan shape and are attached to the inner peripheral edge of the rim core metal. Since they are in contact with each other and welded, the welding area becomes larger and breakage at the welded location can be prevented. Also,
Of the three-way reinforcing bracket that covers at least the lower circumferential surface near the intersection of the spoke core metal and the rim core metal, the branched part that extends to the outside of the pair of spoke core metals is made the longest. When a large load is applied to the rim portion on the side where no rim exists, deformation can be sufficiently prevented even if the distance from the load point to the joining point of the core metal is long.
Furthermore, even if a large load is applied to the rim part sandwiched between a pair of spoke core metals, the distance from the load point to the joint of the core metals is much smaller, so the deformation in this area is much smaller than in the former case. from,
The length of the branch located at this portion can be shortened in proportion to this, and the weight can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a conventional core bar, Fig. 2 is a front view showing an embodiment of the present invention, and Fig. 3 is a front view showing a conventional core bar.
FIG. 4 is a front view of essential parts showing another embodiment, and FIG. 5 is a cross-sectional view taken along the - line in FIG. 4. 1, 1...Spoke core metal, 4...Rim core metal, 6
... Reinforcement bracket, 6a, 6b, 6c... Branch portion.

Claims (1)

[Scope of utility model registration request] In a steering wheel in which a pair of left and right spokes are arranged close to each other, the outer end of the spoke core metal spreads out in a fan shape, comes into contact with the inner peripheral edge of the rim core metal, and is welded, with the welding point being the center. At least the lower peripheral surfaces near the intersection of the spoke core metal and the rim core metal are covered and welded together by the reinforcing bracket that branches into three directions, and the length of the branched part of the reinforcement bracket extends to the outside of the pair of spoke core metals. A steering wheel core bar characterized by a length that is greater than the length of other branch parts.