JP2002087001A - Wheel structure of vehicular wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheel structure of a vehicular wheel capable of favourably supporting a core forming a hollow shape of a spoke part. SOLUTION: The spoke part 14 makes the hollow shape and a hope 15a for the core is formed roughly on a central part in the longitudinal direction of a side surface part 15 along the vehicle longitudinal direction in the wheel structure for a motorcycle having a hub part 12 through which an axle passes, a rim part 13 on which a tire is installed and the spoke part 14 to connect the rim part 13 and the hub part 12 to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel structure for a vehicle wheel such as a motorcycle.

[0002]

2. Description of the Related Art Conventionally, a motorcycle is equipped with front wheels and rear wheels, which are wheels provided with tires.

The wheel has a hub portion through which an axle passes, a rim portion to which a tire is mounted, and a spoke portion connecting the rim portion and the hub portion and extending along a radial direction.

This wheel is made of an aluminum alloy, is integrally formed by casting, and has a spoke portion formed in a hollow shape using a core.

[0005]

However, in such a conventional device, since a core is used to form a hollow spoke portion, there is a problem in how to support the core. Becomes

Accordingly, an object of the present invention is to provide a wheel structure of a vehicle wheel that can favorably support a core forming a hollow spoke portion.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a hub portion through which an axle passes, a rim portion to which a tire is mounted, the rim portion and the hub are provided. In a wheel structure for a motorcycle having a spoke portion connecting parts, the spoke portion has a hollow shape, and a hole for a core is formed at a substantially central portion in a longitudinal direction of a side portion along a vehicle front-rear direction. And a wheel structure for the vehicle wheel.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the core hole is formed on opposite side surfaces of the spoke portion along the vehicle longitudinal direction. The spoke portion is penetrated in the vehicle width direction through both core holes.

The invention described in claim 3 is the first or second invention.
In addition to the above configuration, the core hole has a long hole shape along a longitudinal direction of the side surface portion.

[0010] The invention described in claim 4 is the first to third aspects of the present invention.
In addition to the configuration described in any one of the above, the peripheral edge of the core hole on the front side in the wheel rotation direction has a gill shape that protrudes outward.

[0011]

Embodiments of the present invention will be described below.

1 to 4 show an embodiment of the present invention.

First, the structure will be described. In the drawing, reference numeral 11 denotes a wheel of a motorcycle wheel. The wheel 11 is made of an aluminum alloy, is integrally formed by casting, and has a hub portion 12 through which an axle passes and a tire. A rim 13 to be mounted;
Spoke section 1 connecting rim section 13 and hub section 12
And 4.

The hub portion 12 has a hollow shape and a through hole 12a through which an axle passes is formed at the center, while the rim portion 13 is formed concentrically with the hub portion 12, as shown in FIG. The cross section is formed in a concave shape.

On the other hand, three spoke portions 14 are formed around the hub portion 12 at intervals of 120 ° along the radial direction. Each of the spoke portions 14 has a hollow shape, has a substantially elliptical cross section as shown in FIG. 4, and has side surfaces 15 facing each other along the vehicle front-rear direction.
An arc-shaped front surface portion 16 connecting the front sides in the wheel rotation direction of the both side surface portions 15 and an arc-shaped rear surface portion 17 connecting the rear sides in the wheel rotation direction of the both side surface portions 15 are continuous. Arrows in FIG. 4 indicate the direction of wheel rotation.
The cross-sectional shape of the rear surface portion 17 is smaller than that of the front surface portion 16, and the cross-sectional shape is formed so as to gradually decrease from the hub portion 12 toward the rim portion 13. ing.

Then, both side portions 1 of the spoke portion 14
Each of the holes 5 has a long hole-shaped core hole 15a extending in the longitudinal direction substantially at the center in the longitudinal direction. The spoke portion 14 is penetrated in the vehicle width direction through both core holes 15a formed in the opposed side surface portions 15.

Further, as shown in FIG. 4, a peripheral portion 15b of the core hole 15a on the front side in the wheel rotation direction is
It has a gill shape that protrudes outward.

In addition, around the core hole 15a,
Thick part 15c thicker than other parts (shown by oblique lines in FIG. 3)
Are formed, and around this, a deformable portion 15d whose thickness is gradually reduced is formed.

As shown in FIGS. 1 and 3, small-diameter drain holes 15e are formed in the connecting portions of the side surfaces 15 with the rim 13 respectively.

In such a case, the rim 13
In the position including the vicinity of the central portion, a long hole-shaped core hole 15a is provided.
Is formed, the core forming the hollow shape of the spoke portion 14 can be supported in a well-balanced state at the time of casting, and a relatively large hole can be formed in the vicinity of the central portion. Support strength can be improved.

The core hole 15a is formed on both side surfaces 1a.
5, the core can be supported by both ends, so that the supporting strength is improved, and the accuracy of the core position can be improved. The overall weight can be reduced. Moreover, since the core hole 15a has a long hole shape along the longitudinal direction, the core can be supported in a long range, so that the core support strength is further improved and the core is a long hole. Easy to remove sand.

Further, by forming a relatively large core hole 15a in the center of the rim portion 13, the wheel 1
1 can be reduced in weight. Also, holes 1 for both cores
By allowing the spoke portion 14 to penetrate through 5a,
Since the scene on the opposite side of the spoke portion 14 can be seen, the appearance also looks light.

On the other hand, when the wheel 11 rotates in the direction of the arrow in FIGS. 1 and 4, the peripheral portion 15b of the core hole 15a on the front side in the wheel rotation direction has a gill shape. Water can be suppressed from entering the hollow spoke portion 14 from the hole 15a.

Further, the core hole 15 for the spoke portion 14 is provided.
Since the thick portion 15c is formed around the portion a, the strength is improved, and the deformation portion 15d is formed so that the thickness is gradually changed. Can also be prevented.

Further, since a drain hole 15e is formed in the side surface portion 15 of the spoke portion 14, the core hole 1
If water enters the spoke portion 14 from 5a or the like,
Depending on the rotation position of the wheel 11, when the drainage hole 15e is located below, the water is drained from the drainage hole 15e.

[0026]

As described above, according to the first aspect of the present invention, the hole for the core is formed in the vicinity of the longitudinal center of the side portion of the spoke portion along the vehicle longitudinal direction. The core, which forms the hollow shape of the spoke part during casting, can be supported in a well-balanced manner through the core hole provided near the center, and a relatively large hole is formed because it is near the center. Therefore, the supporting strength of the core can be further improved.

According to the second aspect of the present invention, the core can be supported by both ends by forming the core holes in the opposite side surfaces of the spoke portions along the vehicle longitudinal direction. Since the strength is improved and the positioning accuracy of the core can be improved, the basic thickness can be set thinner, and the weight of the entire wheel can be reduced. In addition, by making the spokes penetrate through the holes for both cores, the scene on the opposite side of the spokes can be seen, so that the appearance is light.

According to the third aspect of the present invention, since the core hole has a long hole shape extending in the longitudinal direction, the core can be supported in a long range. Is further improved, and sand is easy to remove because of the long holes.

According to the fourth aspect of the present invention, since the peripheral edge of the core hole on the front side in the wheel rotation direction has a gill shape projecting outward, when the wheel rotates, the gills are formed. The perimeter of the shape can prevent water from entering the hollow spokes from the core hole.

[Brief description of the drawings]

FIG. 1 is a front view of a wheel according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1 according to the embodiment;

FIG. 3 is a sectional view taken along the line BB of FIG. 2 according to the embodiment;

FIG. 4 is a sectional view taken along the line CC of FIG. 1 according to the embodiment;

[Explanation of symbols]

 11 Wheel 12 Hub 13 Rim 14 Spoke 15 Side 15a Core hole 15b Peripheral edge of core hole in the wheel rotation direction

Claims (4)

[Claims] 1. A motorcycle wheel structure comprising a hub through which an axle passes, a rim to which a tire is mounted, and a spoke connecting the rim and the hub, wherein the spoke is: A wheel structure for a vehicle wheel, wherein the wheel structure has a hollow shape, and a core hole is formed at a substantially central portion in a longitudinal direction of a side portion along a vehicle front-rear direction. 2. The spoke portion penetrates through the spoke portion in the vehicle width direction through the two core holes by forming the spoke portion on opposite side surfaces of the spoke portion along the vehicle longitudinal direction. The wheel structure of a vehicle wheel according to claim 1, wherein: 3. The wheel structure for a vehicle wheel according to claim 1, wherein the core hole has an elongated shape along a longitudinal direction of the side surface portion. 4. The vehicle according to claim 1, wherein a peripheral edge of the core hole on the front side in the wheel rotation direction has a gill shape projecting outward. Wheel structure for wheels.