JP2007076432A - Wheel for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel for a vehicle having a cast hole part structure capable of achieving compatibility of lightweight, torsional rigidity and rotary bending rigidity with one another. <P>SOLUTION: This wheel 1 for the vehicle is furnished with disc parts 4 having spoke parts 2 and window parts 3 formed between the spoke parts 2, rim parts 5 and hub fixing parts 6. A cast hole part 7 extends to the hub fixing part 6 on the back surface side of the spoke part 2, a window rib 8 is formed between the thinned part 7 and the window part 3, and the maximum width W<SB>1</SB>of the cast hole part at the hub fixing part 6 is larger than the width W<SB>2</SB>of the cast hole part 7 at an inner peripheral part of the spoke part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle wheel, and more particularly to a vehicle wheel that achieves both weight reduction and torsional rigidity and rotational bending rigidity.

  There are various materials and structures for automobile road wheels. One-piece aluminum wheels used in passenger cars and RV cars are widely used to reduce the weight of the vehicle body. Forging, high-pressure casting, low-pressure casting, gravite casting, and the like are known as methods for producing such a one-piece aluminum wheel, but molten metal is filled into the mold cavity at a low speed, and gas entrainment and generation of oxides occur. In general, the low-pressure casting method is the mainstream because it is suppressed as much as possible compared to other casting methods.

  As shown in FIG. 3, the one-piece aluminum wheel includes a thick hub fixing portion 26 that is attached to an axle by a bolt and a nut through a hub bolt hole 29, a spoke portion 22, and a window portion formed between the spoke portions 22. Although the hub fixing part 26 and the rim part 25 cannot be significantly changed in terms of handling with the vehicle body or the tire, the one-piece aluminum has so far been constructed. Various technical improvements have been proposed in addition to weight reduction based on the cast-out portion 27 and the like for the wheel.

  For example, Patent Literature 1 discloses a middle rib positioned in the center in the width direction on the back side of the spoke portion, a ground plate portion located on both sides of the middle rib, and a decoration that is located outside the ground plate portion and surrounds the periphery of the decorative hole. The cast aluminum wheel which consists of a hole rib and is formed thickly in order of the base plate part, the middle rib, and the decoration hole rib is described in the case of the casting shape. By making such a shape by milling after casting, it is possible to realize weight reduction without casting defects.

  Patent Document 2 discloses that a pair of spoke portions are disposed on both sides of each hub bolt hole drilled in the wheel center portion, and that these spoke portions are configured to be thicker toward the wheel center portion side. As a result, it is possible to prevent the occurrence of in-vehicle vibration and noise due to the “face-down mode” of the wheel.

Further, in Patent Document 3, an outer rib is formed between the cast portion and the window portion on the back surface side of the spoke portion, and an intermediate rib formed by casting is formed in the center on the back surface side of the spoke portion. An equipped vehicle wheel is disclosed, whereby it is possible to reduce the strength and weight.
JP 2000-255202 A (Claims etc.) JP 2002-293101 A (Claims etc.) JP 2005-1549 A (Claims etc.)

  However, until now, sufficient examination has not been made from the viewpoint of balancing the weight reduction of the wheel with the torsional rigidity and the rotational bending rigidity, and there is still room for improvement in this respect.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle wheel capable of achieving both weight reduction and torsional rigidity and rotational bending rigidity.

  In order to solve the above-mentioned problems, the present inventor has intensively studied that the hub fixing part has little influence on the torsional rigidity and the rotational bending rigidity, and as a result, has determined a cast part to be formed on the back side of the spoke part. It has been found that the above object can be achieved by adopting the shape of the present invention, and the present invention has been completed.

That is, the vehicle wheel of the present invention is a vehicle wheel comprising a spoke portion and a disk portion having a window portion formed between the spoke portions, a rim portion, and a hub fixing portion.
A cast part extends to the hub fixing part on the back side of the spoke part, a window rib is formed between the cast part and the window part, and the cast part at the hub fixing part The large W ₁ is characterized by being larger than the cast part width W ₂ in the inner peripheral part of the spoke part.

In the vehicle wheel according to the present invention, the planar shape of the cast portion is preferably a substantially gourd shape, and the cast portion maximum width W ₁ is preferably 1.5 to 1.5 of the cast portion width W ₂ . 3 times.

  According to the present invention, it is possible to satisfactorily balance the weight reduction, torsional rigidity, and rotational bending rigidity of the vehicle wheel.

In FIG. 1, the expanded partial side view in the back surface side of the wheel for vehicles which concerns on suitable embodiment of this invention is shown. A vehicle wheel 1 shown in FIG. 1 includes a spoke portion 2 and a disk portion 4 having a window portion 3 formed between the spoke portions 2, a rim portion 5, and a hub fixing portion 6 having a hub bolt hole 9. On the back side of the spoke portion 2, a cast portion 7 extends to the hub fixing portion 6 as shown in the figure. A window rib 8 is formed between the cast-out part 7 and the window part 3. In the present invention, it is important that the maximum width W ₁ of the cast portion in the hub fixing portion 6 is larger than the width W ₂ of the cast portion in the inner peripheral portion of the spoke portion 2.

  As shown in FIG. 1, by reducing the width of the planar shape of the cast-out part 7 on the inner peripheral side of the wheel and increasing it on the outer peripheral side, it is possible to achieve both weight reduction and rotational bending strength. Further, by extending the cast portion 7 from the spoke portion 2 to the hub fixing portion 6, further weight reduction can be realized without impairing torsional rigidity and rotational bending rigidity.

Further, at that time, the maximum width W ₁ of the cast part 7 in the hub fixing part 6 can be made larger than the width W ₂ of the cast part 7 on the inner peripheral part of the spoke part 2. The planar shape is preferably a substantially gourd shape, and the cast portion maximum width W ₁ is preferably 1.5 to 3 times the cast portion width W ₂ .

  FIG. 2 shows a cross-sectional view of the spoke portion 2 along the radial direction (a view taken along the line AA in FIG. 1). As illustrated, the cast-out part 7 extends from the spoke part 2 to the hub fixing part 6. The outline of the cast-out part 7 may be linear, but can be optimized as appropriate, for example, by providing a curved part. The height of the window rib 8 may be optimized as appropriate from the viewpoint of securing torsional rigidity and rotational bending rigidity.

  The shape of the design surface of the wheel can be appropriately changed according to a request from a user such as a car maker. In the present invention, the shape of stealing on the back side of the design surface is optimized.

Hereinafter, the present invention will be described based on examples.
(Manufacturing method)
In this example, casting was performed using an aluminum alloy material equivalent to AC4C or AC4CH material defined in JIS.

(analysis method)
The analysis method in the present invention was performed according to the following procedure. This analysis simulates the torsional rigidity test and the rotational bending rigidity test of the wheel, and a known means such as a finite element method or a boundary element method is used as a method.

EXAMPLE Three-dimensional data of a vehicle wheel (size: 18 inches) having the spoke back surface shape shown in FIG. 1 was formed. The dimensions of the vehicle wheel in this embodiment are as follows.
Spoke width: 60mm
Spoke length: 140mm
Window rib thickness: 20mm
Ceiling wall thickness: 6mm
Maximum width of cast-out part W _{1 at} hub fixed part: 28 mm
Cast-out part width W _{2 at} the inner peripheral part of the spoke part: 18 mm
Maximum width W ₃ of cast-out part in spoke part: 42 mm
Weight: 11.9kg
The width of the spoke part is the narrowest part of the distance from the window part 3 at one end to the window part 3 at the other end, and the length of the spoke part is on the rotating shaft side where the window part 3 is formed. The length is from the diameter to the diameter on the rim portion 5 side.

  When the vehicle wheel of this example was analyzed for each of the torsional rigidity test and the rotational bending rigidity test, both characteristic values satisfying the user's requirements were obtained.

Comparative Example Three-dimensional data of a vehicle wheel (size: 18 inches) having the spoke back surface shape shown in FIG. 3 was formed. The dimensions of the vehicle wheel in this comparative example are as follows.
Spoke width: 60mm
Spoke length: 140mm
Window rib thickness: 13mm
Ceiling wall thickness: 9mm
Maximum width of cast-out part W _{1 at} hub fixed part: 0 mm
Cast-out portion width W _{2 at} the inner peripheral portion of the spoke portion: 0 mm
Maximum width W ₃ of the cast part in the spoke part: 38 mm
Weight: 12.2 kg

  When the torsional rigidity test and the rotational bending rigidity test were analyzed for the vehicle wheel of the comparative example, the same characteristic values as in the above example were obtained, but the weight was 2.5% compared to the example. It was heavy.

It is the elements on larger scale which show the back surface shape of the vehicle wheel which concerns on one embodiment of this invention. It is an AA arrow line view of FIG. It is the elements on larger scale which show the back surface shape of the wheel for vehicles of a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle wheel 2 Spoke part 3 Window part 4 Disc part 5 Rim part 6 Hub fixing | fixed part 7 Casting part 8 Window rib 9 Hub bolt hole

Claims (3)

In a vehicle wheel comprising a spoke part and a disk part having a window part formed between the spoke parts, a rim part, and a hub fixing part,
A cast part extends to the hub fixing part on the back side of the spoke part, a window rib is formed between the cast part and the window part, and the cast part at the hub fixing part vehicle wheel greatly W ₁ is being greater than the cut-out portion width W ₂ cast in the spoke portion inner peripheral portion.   The vehicle wheel according to claim 1, wherein a planar shape of the cast-out part is a substantially gourd shape. The vehicle wheel according to claim ₁ , wherein the maximum width W ₁ of the cast portion is 1.5 to 3 times the width of the cast portion W ₂ .

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