JPH11245605A - Rim - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a road noise during running while improving rim assembling performance. SOLUTION: At a rim well part 3 of a rim body 2a where a tire is mounted, a noise proofing seat-like member 5 is provided which interrupts a tire inner cavity formed by the tire and the rim body 2a and rises simultaneously with rotation of the tire. Accordingly, cavity resonance generated in the tire inner cavity during rotation of the tire is restrained so as to reduce a road noise. Rim assembling performance is also significantly improved because the noise proofing seat-like member 5 does not rise when the tire is out of rotating, for example during assembling the rim.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rim capable of reducing road noise during traveling by assembling tires while improving rim assemblability.

[0002]

2. Description of the Related Art In recent years, there has been a demand for lower noise and quieter vehicles. There are various types of noise generated by tires, and when traveling on rough roads,
Road noise, which produces a so-called go sound in the frequency range of Hz, is transmitted to the inside of the vehicle and becomes a muffled sound in the cabin, giving the occupant a discomfort.

[0003] As a result of various experiments by the present inventors, such road noise is caused by the fact that the tire cavity surrounded by the tire and the rim becomes an air column and the air undergoes resonance vibration (cavity resonance). It has been found to have had a significant impact.

[0004] The present applicant has already disclosed in Japanese Patent Application Laid-Open No. 63-1370.
Japanese Patent Laid-Open No. 05-2005 proposes that a shield extending from the rim is attached to the tire bore to suppress such resonance.

[0005]

However, in the rim or the assembly of the tire and the rim disclosed in JP-A-63-137005, all the shields are arranged or incorporated in a state of standing up from the rim in the tire radial direction. Therefore, there was a problem that it was difficult to assemble the tire on the rim.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is based on the provision of a soundproof sheet that rises with rotation of a tire in a rim well portion while improving the rim assembling property of the tire. It is intended to provide a rim that can reduce road noise by assembling the rim.

[0007]

According to a first aspect of the present invention, there is provided a tire cavity formed between the tire and the rim main body in a rim well portion of the rim main body to which the tire is mounted, as the tire is rotated. This is a rim provided with a sound-insulating sheet-like body that blocks the sound.

According to a second aspect of the present invention, the soundproof sheet is attached to the rim well in the tire axial direction, and has a width substantially equal to the width of the rim well. A rim according to claim 1.

The invention according to claim 3 is the rim according to claim 1 or 2, wherein the soundproof sheet-like body is made of a flexible material and has a weight portion at a free end.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the rim 1 of the present embodiment is, for example, a two-piece wheel having a rim main body 2a on which a tire T is mounted and a disk 2b holding the rim main body. To reduce the bead portion B of the tire T, a rim well portion 3 having a reduced outer diameter is formed.

In the tire T, the bead portion B is brought into contact with the flange 6 of the rim main body 2a and is fitted airtightly. In this example, the tire T forms a gas-tight tire cavity 4 with the rim main body 2a by forming a tubeless structure in which an air-permeable rubber is added to the inner surface facing the tire cavity 4.

In the present invention, the rim well 3 of the rim main body 2a rises with the rotation of the tire T (rim 1), and shuts off the tire cavity 4 formed by the tire T and the rim main body 2a. It is characterized by having provided.

As described above, the sound-insulating sheet member 5 that blocks the tire bore 4 is raised by using the rotation of the tire T, that is, the centrifugal force, as shown by the dashed line in FIG. 1 and FIG. 3B. Thus, cavity resonance of the tire lumen 4 can be suppressed, and road noise can be reduced. In addition, when the tire T is not rotating, for example, when assembling the rim, as shown in FIG. 3A, the soundproof sheet-like body 5 is not raised, so that the rim assembling workability can be greatly improved.

In this embodiment, the soundproof sheet 5
Shows an example in which the rim well portion 3 is attached to the rim well portion 3 in the tire axial direction and the width Ws thereof is set to be substantially equal to the width Wr of the rim well portion 3.

Accordingly, when the tire T is not rotating, the soundproof sheet-like body 5 is in contact with the bottom surface 3a of the rim well 3 as shown in the solid line of FIG. 1 and FIG. Since the rim can be dropped into the portion 3, it is preferable that the rim can be further improved without disturbing the rim assembling. Rim well 3
The width Wr conforms to the stipulations of the dimensions of each part of the rim and the disk in JIS D4102. Further, the expression “substantially equal” means that it is sufficient to ensure that the soundproof sheet-like body 5 is dropped into the rim well portion 3 while securing a large width Ws.

The radial length L of the soundproof sheet 5 when it rises is determined by the free length of the soundproof sheet 5 when the tire T is assembled on the rim to fill the internal pressure and a load is applied. Making the end 5a long enough to contact the inward surface 4a of the tire cavity 4 is effective in reducing road noise.

The soundproof sheet 5 is made of a flexible material having a relatively high strength such as rubber, vinyl chloride,
Various materials such as a foamed resin can be adopted, and in this example, a material formed from a thin rubber sheet having a rectangular shape is shown. The thickness is, for example, 0.5 to 2 mm, and in this example, about 1 mm is illustrated. In this example, the soundproof sheet 5 is attached to the rim well 3 via a string jig 7.

As shown in FIGS. 1 and 2, the string-shaped jig 7 includes, for example, a hook F1 provided at an end and a hook receiving member F2.
And a pair of cords 7a, 7a attached to the bottom surface 3a of the rim well 3 and provided over the upper surfaces of the cords 7a, 7a and substantially parallel to the axial direction of the rim 1. This shows the structure including the pivot 7b. The soundproof sheet 5 is rotatably attached to the pivot 7b.

As a result, when the tire is not rotating, the soundproof sheet-like body 5 can be positioned on the bottom surface 3a of the rim well portion 3 by its own weight as shown in FIG.
As shown in FIG. 3B, the pivot 7b
Can be launched around.

In this embodiment, the soundproof sheet 5 having a weight 9 at the free end 5a is illustrated. This is preferable in that a greater centrifugal force acts on the soundproof sheet 5 and the sheet 5 can be more easily raised, and the effect of reducing road noise can be further enhanced.

In this embodiment, the weight 9 is made of an aluminum shaft, which is attached by covering the rubber shaft with the rubber sheet, whereby the aluminum shaft is directly connected to the rim well. 3 can be prevented from being brought into contact, and damage to the rim can be prevented. The weight portion 9 may be formed of a material different from that of the rubber sheet as in the present embodiment, or may be formed by increasing the rubber thickness of the free end 5a of the soundproof sheet-like member 5 and realized by various methods. Can.

It should be noted that such a weight portion 9 has an adverse effect even if it is too heavy, and preferably has a weight of 5 to 20 g.
In this example, an example using a 10 g aluminum shaft is illustrated.

The effect of the sound-insulating sheet 5 is provided by providing one on the periphery of the rim well portion 3, but it is more preferable to provide two or more, more preferably, the dynamics of the tire. In order to maintain balance
It is most preferable to arrange the plurality of soundproof sheet members 5 at equal circumferential pitch positions.

FIG. 4 shows another embodiment. In this embodiment, a shaft portion 10 on one side of a substantially L-shaped mounting bracket 10 fixed to the bottom of the rim well portion 3 by welding or the like.
In the figure, a is formed by arranging and forming a cavity 12 in the center for bending and attaching the soundproof sheet-like body 5 in the tire axial direction. The soundproof sheet 5 is rotatably mounted on the shaft 10a.

FIG. 5 shows another embodiment, and shows a circumferential section of the rim well portion 3. In this example, the soundproof sheet 5 is attached to the bottom surface 3a of the rim well 3 with an adhesive.

As described in detail above, the rim of the present invention can be formed as a rim to which tires for heavy loads such as passenger car tires, buses and trucks, buggy tires, motorcycle tires and the like can be attached. The soundproof sheet-like member 5 can be attached to the rim by any of various methods other than those illustrated.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A tire (195 / 65R15) is assembled at an internal pressure of 200 KPa on a rim having a size of 15 × 6JJ and having a soundproof sheet (Examples 1 to 3) and a rim having no soundproof sheet (conventional example). Domestic 2500cc F
Attached to R car, 60km / H on rough asphalt road
The sound pressure level (250 Hz and overall) of the sound inside the vehicle when the vehicle traveled was measured. The workability during rim assembly was also evaluated. Table 1 shows the test results and the like.

[0028]

[Table 1]

As a result of the test, it was confirmed that all the rims of the embodiment reduced the road noise as compared with the conventional example. Also, the rim assemblability was good, with no change in the soundproof sheet-like body from the conventional example without any hindrance.

[0030]

As described above, according to the first aspect of the present invention, the sound-insulating sheet that blocks the tire cavity is provided on the tire (rim).
By using the rotation of the tire to start up, it is possible to suppress the cavity resonance of the tire bore while the tire is rotating, and to reduce road noise. Also, when the tire is not rotating, for example, when assembling the rim, the soundproof sheet-like body is not raised, so that the rim assembling workability can be greatly improved.

In the invention according to claim 2, the soundproof sheet-like body is attached to the rim well in the tire axial direction, and the width thereof is set substantially equal to the width of the rim well. During non-rotation, the soundproof sheet-like body 5 can be dropped into the rim well portion, and the rim assemblability can be further improved.

According to the third aspect of the present invention, by providing the weight portion at the free end of the soundproof sheet, a large centrifugal force acts on the free end, and the soundproof sheet can be more easily raised. The road noise reduction effect can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view illustrating a soundproof sheet.

FIG. 3A is a perspective view illustrating a soundproof sheet when the tire is not rotating, and FIG. 3B is a perspective view illustrating the soundproof sheet when the tire is rotating.

FIG. 4 is a sectional view of a rim showing another embodiment of the present invention.

FIG. 5 is a circumferential sectional view of a rim well portion showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rim 2a Rim main body 3 Rim well part 5 Soundproof sheet-like body 5a Free end of soundproof sheet-like body 9 Weight part T Tire

Claims (3)

[Claims] 1. A rim provided with a sound-insulating sheet-like body which rises with rotation of a tire and blocks a tire cavity formed by the tire and the rim body on a rim well portion of a rim body on which the tire is mounted. 2. The rim according to claim 1, wherein the soundproof sheet is attached to the rim well in a tire axial direction, and has a width substantially equal to a width of the rim well. 3. The soundproof sheet-like body is made of a flexible material and has a weight portion at a free end.
The described rim.