JPS60124502A - Automobile wheel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to the shape of an automotive eel.

(Prior art and problems) In recent years, efforts have been made to reduce the weight of automobile parts from the perspective of energy conservation, and in particular, the weight reduction effect of rotating objects such as wheels is greater than that of non-rotating objects. Light 111
− consideration is being actively pursued.

Rule・11YI id: This is a schematic representation of the shape of the wheel for the own T/H vehicle. Figure 1 (rL) is a perspective view, and Figure 1 (b) is a partially enlarged view of the vicinity of the nut seat. .

As seen in the figure, the plurality of nut seats 2 for the wheel 1 are formed into deep overhangs by heavy processing.
It is tightened by wheels.

By the way, as a means of reducing the weight of automobile wheels, M
There are two methods: one is to use light metal bending, and the other is to reduce the plate thickness by using a high-strength steel plate.

However, since the former is made by casting and machining, it is expensive and is used only for special purposes. On the other hand, the latter wheel is manufactured by pressing a steel plate and is suitable for large) k production, so it is generally widely used as an economical wheel.

The original purpose of a wheel is to correctly transmit the vertical and lateral loads received by a car, as well as the driving force or braking torque required for the vehicle to travel, to the road surface through the tires attached to the wheel. Durability and strength are of paramount importance in order to fulfill the safety functions of wheels, and for this reason, durability tests are prescribed for wheels.

In recent years, wheels have become more important in their design as decorative items, so the molding process is more complex than that of conventional wheels.

Therefore, in order to achieve quantification using a high-strength steel plate, it is essential that it be capable of advanced forming processing and at the same time satisfy the requirements for durability.

However, it is known that as the strength of a steel plate increases, the elongation value in a tensile test generally decreases, making it difficult to press a complex molded product such as a wheel.

(7iW) When viewed from the machined surface of the wheel, the area near the nut seat of a wheel with IFIi is the area that undergoes deep overhang forming, which is the most severe forming process. Easy to become thin.

Such thinning of the meat not only causes a significant decrease in the durability of the wheel, but also weakens the nut seat tightening strength, making it impossible to ensure a constant tightening torque, making it difficult to achieve the purpose of the wheel. I can't.

Therefore, in order to reduce meat thinning, the forming around the nut seat should be done in several breath forming steps to facilitate the inflow of material, and from the material standpoint, high-strength steel plates with good elongation characteristics should be used as much as possible. For example, countermeasures such as using expensive composite structure-reinforced high-strength steel plates are required.

The inventors conducted a detailed study on the durability of wheels, and found that in a bending moment durability test that simulates the repeated stress of lateral loads that a car receives when turning, it was found that large loads were applied to each part of the wheel, especially around the nut seat. It became clear that this was the case.

In particular, when lowering the cage using high-strength steel plates, a large stress is applied to the area around the nut seat, making it difficult to satisfy durability and becoming a major hindrance to weight reduction. Ta.

(Structure of the Invention) The present invention has been made in view of the above-mentioned problems, and is a novel vehicle for use in gallo vehicles, which makes it possible to simultaneously solve the problems of molding near the nut seat of conventional wheels and durability strength. This is a proposal for the shape of the wheel.

That is, the Kinoi 1jJJ is an automobile wheel whose nut seat is formed into an annular shape.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

Figure 2 is a schematic diagram of the wheel of the present invention, and Figure 2 (a) is a perspective view thereof, and Figure 2 (in Figure 2) is a partially enlarged view of the vicinity of the nut seat.

As seen in the figure, the nut seat 3 is located on the wheel 1;
It is shaped like a.

The reason for providing such an 11-shaped nut seat is that the stress distribution, which increases around the nut seat, is averaged in the circumferential direction of the nut seat. This is because you can improve your physical strength as a result.

This ) J-shaped nut seat has a constant width around the entire circumference, but if there is no problem with forming, the design can be improved by making the wheel nut's details wider only at the part. You can raise your rank higher.

In such a nut seat, it is only necessary to provide the wheel nut hole 5 at the annularly overhanging part, and there is no need for local overhang processing as in a normal wheel.

Although it is possible to achieve the desired effect by using a regular wheel nut when tightening, if you want to further improve durability by evening out the stress distribution, use the wheel nuts shown in Figure 3 (α ) and (b), it is effective to tighten using a holding jig 4 having an annular shape. In order to ensure a contact surface with the nut seat 3 when the nut seat is engaged, it is desirable that the width dimension of the nut seat is 30 to 40 tnm.

(Effects of the Invention) As described above, in the present invention, the stress distribution which increases around the nut seat can be averaged, the maximum stress itself can be reduced, and the durability strength can be improved. Furthermore, since the wheel of the present invention has an annular nut seat having a high spring constant, high tightening strength can be obtained.

Therefore, it is possible to use a wheel with a nut seat height lower than that of conventional wheels, which results in a lower nut seat height.
+4 molding becomes easier and thinning of the meat is reduced, which is also advantageous in terms of durability and strength.

Furthermore, since the nut seat can be easily formed, expensive materials with high elongation properties as in the prior art are no longer required.

The effects of the present invention will be shown below in more detail through Examples.

Practical Example of the Present Invention The table shows the results of a durability test comparing the wheel of the present invention with a conventional wheel.

The size of the test wheels was 54-t4, the applied moment was 150 kgf-m, and the tightening of the wheels was 54-t4.
The salary is 13 kgf of torque using a wheel nut.
It was carried out in m. The test rotation speed was still 750 rpm. Is the material of the test wheel 55 for both the inventive wheel and the conventional wheel for comparison? MA class high strength steel plate, plate thickness 3
．． One cod.

The table below shows experimental results for the wheels of the present invention and conventional wheels, when the wheels are tightened in the usual way, and when they are tightened using an annular jig.

As is clear from the same table, in the wheels of the present invention, the thinness of the nut seat was reduced, the level of strain generated in the nut seat was significantly reduced, and the durability was improved. In particular, when tightening using an annular jig, the strain level further decreases and increases [1]
The durability has been improved.

[Brief explanation of the drawing]

Figures 1 (α) and (b) are schematic diagrams showing the shape of an automobile wheel, where (α) is a perspective view, (b) is a partially enlarged view, and
Figures (α) and (b) are schematic diagrams showing the wheel of the present invention.
α) is a perspective view, (b) is a partially enlarged view, and Figures 3 (a) and (
1)) is a schematic diagram showing an embodiment in which an annular holding jig is used in a wheel of the present invention, in which (a) is a perspective view and (b) is a front sectional view. ■ is the wheel, 2 is the nut seat, 3 is the annular nut seat, 4-piece annular holding jig, and 5 is the wheel nut hole. Patent Applicant: Nippon America Steel Corporation Tue/Same (ω) Ya/C1p) Ya2 (formerly a-) -A-2 Flash (L)

Claims (1)

[Claims] It is characterized by the fact that the nut seat is shaped like a ring! Wheels for 11b cars.