JPH0867104A - Rim structure for tire wheel - Google Patents

Abstract

PURPOSE: To restric travelling vibration to provide excellent riding comfort by preventing air from being closed between the bead part of a tire and the rim (bead receiving seat) of a wheel to be left as an air reservoir when the tire is assembled to the tire wheel. CONSTITUTION: Long, recessed air escape passages 10 are provided to a tire wheel, namely on the bead receiving seat 5 of a rim 2 in the circumferential direction of the rim. These plural air escape passages 10 are provided at specified intervals along the circumferential direction of the bead receiving seat 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire wheel rim structure.

[0002]

2. Description of the Related Art When incorporating a tubeless tire into a wheel, the bead portion of the tire is fitted to the rim (bead seat) of the wheel. Due to various factors such as inadequate work, air may be trapped between the bead portion and the bead seat, and this may remain as one or a plurality of minute air pools in the circumferential direction. This may occur even in a tire having good RFV (radial force variation) and RRO (radial nanout).

[0003] Such an air pool cannot be eliminated even if the tire is filled with air of a predetermined pressure, and when the tire is mounted on a vehicle while running in this state, running vibration is induced. It made the ride uncomfortable. Conventionally, as techniques for solving this kind of problem, techniques disclosed in JP-A-6-40221 or JP-A-6-40222 have been disclosed. However, all of these techniques include a bead portion of a tire. In order to improve the heel shape and rubber hardness.

[0004]

With the techniques described in the above publications, it is clear that the desired effect cannot be obtained due to wear of the bead portion and deterioration of the rubber material, and the work of incorporating the tire into the wheel is troublesome. If there is,
However, there still remains a risk of generating air pockets.

If the bead portion receives tension toward the center of the tire in the width direction due to deformation of the tire during traveling or the like, the air pool as described above occurs due to this. Although it was rare, such a problem could not be solved by the techniques described in the above publications. The present invention has been made in view of the above circumstances, and prevents air accumulation from occurring between the bead portion of the tire and the rim (bead seat) of the wheel, thereby reducing running stability ( An object of the present invention is to provide a rim structure for a tire wheel that does not deteriorate the riding comfort).

[0006]

In order to achieve the above object, the present invention takes the following technical means. That is, in the present invention, in the rim structure of a tire wheel, a bead seat that rises in a curved shape to fit the bead portion of the tire has a circumferential direction radially outward of a portion where the heel of the bead portion abuts. It is characterized in that a plurality of air bleeding passages are provided at predetermined intervals.

The air vent passage can be formed by recessing the bead seat. The air bleed passage may be formed between the protrusions by providing a plurality of protrusions with respect to the bead seat while maintaining a circumferential gap therebetween. It is preferable that the air vent passage is formed in a range that does not reach the curl surface of the outer peripheral edge of the rim.

The air bleeding passage is formed outside the rim radius from the wheel center position and a position obtained by adding 10 mm or more and 13 mm or less to the outside, and is formed in the range of 8 mm or more and 11 mm or less. It is preferable that the depth is set to 0.3 mm or more and 0.7 mm or less. It is preferable that 12 or more and 36 or less of the air bleed passages are formed in an equal arrangement in the circumferential direction of the bead seat.

[0009]

Since the air bleed passage is formed in the bead seat of the rim of the tire wheel, even if an air pool is generated between the bead portion of the tire and the bead seat, this air will not flow. By filling the tire with air after the tire is assembled, the air is surely exhausted through the air vent passage.

Such an action does not deteriorate or disappear due to wear of the tire or deterioration of the rubber material. Moreover, it does not depend on the failure of tire assembling work. If the air vent passage has a structure that does not reach the curl surface of the outer peripheral edge of the rim, the air vent passage will not be clogged with mud or dust.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged view of a main part of a rim structure of a tire wheel 1 according to the present invention, which corresponds to an enlarged view of part A of FIG. In this wheel 1, 2 is a rim, and bead seats 5 that stand up in a curved shape so as to fit with the bead portions 4 of the tire 3 are provided on both outer peripheral portions of the front and back. In the tire 3, 6 is a heel and 7 is a bead core.

The bead seat 5 of the rim 2 is provided with an air bleed passage 10 at a position radially outward of a portion of the tire 3 on which the heel 6 of the bead portion 4 abuts. A plurality of the air bleed passages 10 are provided along the circumferential direction of the rim 2 so as to be spaced apart from each other by a predetermined distance. Each of the air bleeding passages 10 has an elongated groove shape along the radial direction of the wheel 1, and the range of formation in the longitudinal direction thereof starts from a position at which the rim radius r is added to the wheel center position and a predetermined dimension h1 is added thereto. Is set within the range of a predetermined dimension h2 to the outside. These (r + h1 + h2) are set so as to be smaller than the wheel radius R, that is, the air bleeding passage 10 does not reach the curl surface 12 at the outer peripheral edge of the rim.

The h1 dimension is in the range of 10 mm or more and 13 mm or less. If it is less than 10 mm, there is a risk of air leakage from inside the tire 3 when the tire 3 is deformed, and if it exceeds 13 mm, the air vent passage 1
This is because 0 does not reach the air reservoir and effective air bleeding cannot be performed. The h2 dimension is in the range of 8 mm or more and 11 mm or less. If it is less than 8 mm, the air bleed passage 10 does not extend radially outward from the portion where the bead portion 4 of the tire 3 and the rim 2 (bead seat 5) of the wheel 1 are in contact, so effective air bleeding cannot be performed. If it exceeds 11 mm, the air bleeding passage 10 has the curl surface 12 at the outer peripheral edge of the rim.
This is because there is a risk that mud and sand will enter.

The cross-sectional shape of the air bleed passage 10 is arbitrary, and the bead seat 5 has an inverted triangular shape as shown in FIG. 3A, a semicircular shape as shown in FIG. It is conceivable to provide a recess such as a quadrangular shape as shown in c). Further, as shown in FIG. 4 (a), the bead seat 5 is provided with a plurality of convex portions 15 with a circumferential gap maintained therebetween, and the air vent passages 10 are provided between the convex portions 15.
It is also possible to The cross-sectional shape of the convex portion 15 in this case is also arbitrary. For example, by forming a gentle mountain-shaped convex portion 15 as shown in FIG. 4 (b), the contact of the tire bead portion 4 becomes a point (line), and a small space 10A is created in the installation area to discharge air. It is possible.

In both cases shown in FIGS. 3 and 4, the passage width w and the passage depth d of the air bleed passage 10 are 0.3 m.
The range is from m to 0.7 mm. 0.3 mm
If it is less than 0.7 mm, the duct resistance is large and sufficient air cannot be removed, and if it exceeds 0.7 mm, muddy sand, dust and the like may enter. The air bleeding passages 10 are formed in the circumferential direction of the bead seat 5 in an equal distribution of 12 or more and 36 or less. If the number is less than 12, the possibility of not corresponding to the site where air pockets are generated may increase and air bleeding may become insufficient. If the number is more than 36, machining becomes troublesome and the manufacturing cost rises. This is because, although the production efficiency is lowered, the effect commensurate with it cannot be expected.

The predetermined dimensions h1 and h2 relating to the positioning of the air bleed passage 10, the shape of the air bleed passage 10, the passage width w, the passage depth d, the number, etc. are within the respective allowable ranges, and the wheel size and the tire. It suffices to appropriately make a selection according to the size or the purpose of use. In the present invention, the air vent passages 10 are preferably provided on the bead seats 5 on both front and back sides of the wheel 1, but only one of them may be provided.

The wheel 1 can be implemented not only of iron but also of aluminum.

[0018]

The present invention has the above-mentioned structure, and since the air vent passage is formed in the bead seat of the rim of the tire wheel, the bead portion of the tire and the above bead are formed. The air that is about to be trapped between the seat and the seat is reliably exhausted through the air vent passage. Therefore, there is no occurrence of air accumulation, and traveling stability does not deteriorate (ride comfort deteriorates).

Such an action does not deteriorate or disappear due to wear of the tire or deterioration of the rubber material. Moreover, it does not depend on the failure of tire assembling work. Since the air bleeding passage is provided for the wheel, even when the tire is individually transferred or replaced, its function and effect can be obtained together with the location of the wheel.

If the air vent passage is structured so as not to reach the curl surface of the outer peripheral edge of the rim, the air vent passage will not be blocked by mud or dust.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of a main part (corresponding to an enlarged view of a portion A in FIG. 2) showing a rim structure of a wheel according to the present invention.

FIG. 2 is a cross-sectional view of an essential part showing a situation where a tire is incorporated in a wheel.

FIG. 3 is an enlarged sectional view showing various sectional structures (corresponding to the section taken along the line BB in FIG. 1) in the air bleed passage.

4A and 4B are enlarged cross-sectional views showing two other aspects of the air bleed passage.

[Explanation of symbols]

 1 wheel 2 rim 3 tire 4 bead part 5 bead seat 6 heel 10 air bleed passage 12 curl surface 15 convex part

Claims (6)

[Claims] 1. In a rim structure of a tire wheel, a bead seat (5) which rises in a curved shape to fit a bead portion (4) of a tire (3) has a heel (6) of the bead portion (4). ), A plurality of air bleeding passages (10) are provided radially outward of a portion abutted by) so as to be spaced at predetermined intervals in the circumferential direction thereof. 2. The tire wheel rim structure according to claim 1, wherein the air vent passage (10) is formed by recessing a bead seat (5). 3. The air bleed passage (10) is provided with a plurality of convex portions (15) with respect to the bead seat (5) in a state where a circumferential gap is maintained between the convex portions (15). The structure according to claim 1, characterized in that it is formed between them.
The tire wheel rim structure described. 4. The air bleeding passage (10) is formed in a range that does not reach the curl surface (12) of the rim outer peripheral edge, according to any one of claims 1 to 3. The tire wheel rim structure described. 5. The air bleed passage (10) is 8 mm or more and 11 mm or less (h2 dimension) outward from a rim radius from the wheel center position and a position obtained by adding 10 mm or more and 13 mm or less (h1 dimension) to the rim radius. 5. The tire wheel according to claim 4, wherein the width (w) and the depth (d) of the passage are both 0.3 mm or more and 0.7 mm or less. Rim structure. 6. The air bleeding passages (10) are formed so that 12 or more and 36 or less in the circumferential direction of the bead seat (5) are equidistantly formed. The rim structure of the tire wheel according to claim 5.