JPH01106701A - Light alloy wheel for automobile - Google Patents

Abstract

PURPOSE:To achieve reduction in weight by determining the position of a bead part and connecting the bead part with curved surfaces whose respective curvatures satisfy a specific relationship to form the shape of the hut part. CONSTITUTION:When a wheel disk 3 is formed, first, the position of a bead part 7 is determined. While making the bead part 7 a boundary, a hut part 6 is formed by a first curved part 8 in the radial direction, a second curved part 9 in the radial outward direction, a curved surface S3 connecting the inside surface of the first curved part 8 with the inside of the bead part 7, a curved surface S4 connecting the inside surface of the second curved part 9 with the inside of the bead part 7, and a curved surface S5 connecting the radial inner end of the outside surface of the first curved part 8. In this case, the curvature R1 of the first curved part 8, the curvature R2 of the second curved part 9, and respective curvatures R3-R5 of respective curved surfaces S3-S5 are determined so as to satisfy the relational expressions I. Thus, the distribution of stresses is improved, and the reduction in the deformation and weight of the rim can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an automobile wheel obtained by press forming a light alloy material such as an aluminum alloy.

(Prior Art) Recently, in order to reduce the weight of vehicle bodies, some wheels have been manufactured by rolling or pressing a light alloy material such as an aluminum alloy for both the rim and disk.

On the other hand, since the entire weight of the car body is applied to the wheels, they must be shaped to provide sufficient strength.
According to No. 0-110001, the hat portion formed between the hub mounting surface of the disk and the joining portion to the rim is flat.

(Problem to be solved by the invention) When making a wheel using aluminum alloy, etc. 5 In order to achieve weight reduction, the thickness of the wheel must be reduced to a certain extent, and in order to reduce the thickness, it is necessary to reduce the thickness of the wheel. It is necessary that the applied stress be distributed somewhat evenly.

However, with conventional wheels,
Including the one disclosed in the issue of t t ooo, stress is not distributed evenly and stress concentration occurs locally, and the wheels are made thick enough to withstand this, so weight reduction has not been achieved sufficiently. do not have.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a wheel disc obtained by press-forming a light alloy material, which is formed into a hat portion that bulges in the width direction of the wheel. The position of the bead part is first determined, and the area between the hub bolt insertion hole whose position has been determined in advance and the outer circumferential edge of the disk that is joined to the inner circumferential part of the rim and the bead part has a degree of freedom in shape. The most appropriate curvature for is determined inductively.

(Function) By setting the position of the bead portion and the curvature of the curved portions provided radially inward and outward from the bead portion to predetermined values, stress is evenly distributed.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a sectional view of a wheel according to the present invention. The wheel 1 consists of a rim 2 and a disc 3. The rim 2 is formed by rolling a light alloy material such as an aluminum alloy, and the disc 3 is made of aluminum. It is formed by press forming a light alloy material such as an alloy.

The disk 3 has a large-diameter hub hole 4 in the center, and a hub bolt insertion hole 5 is provided radially outward of the hub hole 4. A brake caliper and the like are positioned inside the hat portion 6.

The hat portion 6 has a bead portion 7 protruding outward in the width direction at approximately the center thereof, and a first portion extends inward in the radial direction with this bead portion 7 as a border.
The radially outer side of the curved portion 8 is a second curved portion 9, and the second curved portion 9 is provided with a decorative window 10.

The center 01 of the bead portion 7 is the center 02 of the disk 3.
The curvature of the outer surface S1 of the first curved portion 8 is R1, the curvature of the outer surface S2 of the second curved portion 9 is R2, and A curved surface S3 that connects the inner surface of the curved portion 8 and the inner surface of the bead portion
The curvature of the curved surface S4 is R3, the curvature of the curved surface S4 that connects the inner surface of the second curved section 9 and the inner surface of the bead section is R4, and the curved surface S5 that is continuous to the radially inner end of the outer surface of the first curved section 8. When the curvature of is R5, R1 to R5 have the following values.

R1= 110mm±2 mm R2= 100mm±2 am R3-14mm thl mm R4=14n+IIl±1 mm R5= 3m01±0.3mm The above values were determined based on the stress dispersion and the amount of deformation of the rim. The process of determining the value of each R will be explained below.

First, there are various shapes for the hat part 6, such as a flat shape and a shape without a bead, but the shape shown in Fig. 2 was selected as the type with the best stress dispersion and the least amount of deformation. Based on this shape, we determined the optimal shape of the hat. That is, the hat part has a bead part that is effective in improving stress dispersion and strength approximately in the center, and the radially inner part of the bead part is the first curved part, and the radially outer part is the second curved part. The radial position of the bead portion is determined by step (2), the curvature R1 of the outer surface of the first curved portion is determined by step (2), the curvature R2 of the outer surface of the second curved portion is determined by step (2), and the curvature R2 of the outer surface of the second curved portion is determined by step (2). The 1 ratio R3 of the curved surface that connects the inner surface of the first curved section and the inner surface of the bead section is calculated by step (2), and the curvature of the curved surface that connects the inner surface of the second curved section and the inner surface of the bead section is determined by step (2). R4 is changed to the curvature R5 of the curved surface that continues inward in the radial direction of the first curved portion by step
was determined, and the position and curvature determined in steps (2) to (2) were confirmed in step (2).

In addition, when determining the position and curvature of the bead,
The test is performed based on the amount of radial deformation of the rim and the dispersion of stress in each part of the hat, and the test apparatus shown in FIG. 3 is used to examine the dispersion of stress and the amount of deformation of the rim.

In other words, the flange of the rim 2 of the wheel 1 is fixed to the rotating disk 11 of the testing device, one end of the load arm 12 is attached to the disk 3, and the wheel 1 is rotated while applying a constant load to the other end of the load arm 12 with a weight. By rotating the
The amount of stress acting on the wheel 1 is measured using strain sensors and the like attached to important points on the wheel 1.

Figures 4 (A) (B) to 10 @ (A) (B) are diagrams showing the results of steps ■ to step ■ performed using the above test device, and (A) in each figure shows the results for each step. The shape (position) of the part to be tested is shown in (B) of each figure.
The shape shown in A), the stress dispersion, and the amount of deformation of the rim are shown.

Specifically, from Fig. 4 (A) and (B), line segment ■ has the best stress dispersion, and the center 01 of the bead portion 7 is 110 mm above and 3 mm radially outward from the center 02 of the disk 3. It turns out that a position close to is optimal. Incidentally, although the line segment (■) is inferior to the line segment (2) in terms of the amount of rim deformation, the line segment (2) can be said to be optimal if stress dispersion is also taken into account. Further, the curvature of the bead portion 7 at this time was 12 mm.

Furthermore, from (A) and (B) in FIG. 5, the curvature R1 of the outer surface S1 of the first curved portion 8 is 100 +n+n±2), and from (A) and (B) in FIG. The curvature R2 of the outer surface S2 of the first curved portion 8 is 10010[0±2 mm, and from FIGS. R3 is 14 mm±1 mm, and from FIGS. 8(A) and 8(B), the curvature R4 of the curved surface S4 that connects the inner surface of the second curved portion 9 and the inner surface of the bead portion 7 is 14 mm.
mm±1 mm, and from FIGS. 9(A) and 9(B), the stress is calculated when the curvature R5 of the curved surface S5 continuous to the radially inner end of the outer surface S1 of the first curved portion 8 is 3 mm by 0.3 mm. It can be seen that the dispersibility of the rim is excellent and the amount of deformation of the rim is small. and the first
From Figure 0 (A) and (B), the above steps ■ to Step ■
It is confirmed that the shape obtained by the position and curvature of the bead portion obtained by the method is excellent in terms of the overall shape.

In the example, only the curvature of the outer surface S2 of the curved portion 9 in FIG. However, for the curved surface S6, the curvature R6 is 80m+n±2m
m, and for the curved surface S7, the curvature R7 is 54n+m±2mm
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(Effects of the Invention) As explained above, in the wheel according to the present invention, the most important position of the bead part is first determined by repeating many tests, and then this bead part is moved to the optimal position of the inner and outer parts. Because the shape of the wheel disc's hat is determined by determining the curvature and connecting these curvatures, it has excellent stress dispersion, reduces the amount of rim deformation, and eliminates the need to make materials such as aluminum alloy thicker than necessary. It is possible to achieve weight reduction.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a wheel according to the present invention, FIG. 2 is a diagram showing the basic shape of the wheel hat, FIG. 3 is a schematic diagram of the test equipment, and FIGS. 4 (A) and (B) to 10 Figures (A) and CB) are graphs showing the shape of the hat, stress dispersion, and amount of rim deformation. In addition, in the drawing, 1 is a wheel, 2 is a rim, 3 is a disc,
6 is a hat portion, 7 is a bead portion, 8 is a first curved portion, and 9 is a second curved portion. Patent applicant: Agent for Honda Motor Co., Ltd.
Patent Attorney Part 2 1) Yong-Immediate Question Patent Attorney
Kuni Ohashi Production volume Patent attorney Small
Yama Yuki Patent Attorney No 1)
Shigeru Fig. 3 Fig. 6 Length of sufu = (mm) Picture-11

Claims (1)

[Claims] It has a disk made of expanded light alloy such as aluminum alloy, and this disk has a hat portion that bulges outward in the width direction of the wheel. In a light alloy wheel in which a bead portion is formed and first and second curved portions are provided radially inward and outward of the wheel with this bead portion as a boundary, the center of the bead portion is approximately at the center of the hat portion. and the curvature of the outer surface of the first curved portion is R1.
, the curvature of the outer surface of the second curved portion is R2, the curvature of the curved surface that connects the inner surface of the first curved portion and the bead portion side surface is R3,
If the curvature of the curved surface that connects the inner surface of the second curved portion and the inner surface of the bead portion is R4, and the curvature of the curved surface that continues to the radial end of the outer surface of the first curved portion is R5, then R1 to R5 A light alloy wheel for an automobile, characterized in that the following relationship holds true when the curvature of R1 is used as a reference. R2≒(10/11) R1 R3≒R4≒(14/11
0) R1 R5≒(3/110)R1