JP2005219593A - Assembly of pneumatic tire and wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve assembling workability of a sound suppressing tool to a rim of a wheel and attaching/detaching workability of a tire to/from the rim of the wheel. <P>SOLUTION: In this assembly, a storage groove 11b is recessed in a peripheral direction in a well part 11a of the rim 11 mounted with the tire thereon and the sound suppressing tool 20 is stored and arranged in the storage groove 11b. A groove upper end part of the storage groove 11b is chamfered by a circular-arc of a radius Rw>0 mm. Thickness T vertically measured in relation to a bottom surface of the storage groove 11b of the sound suppressing tool 20, a depth D vertically measured in relation to the bottom surface of the storage groove 11b and the radius Rw have a relation of (D-Rw)≥T. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a set of a pneumatic tire and a wheel capable of reducing road noise caused by resonance vibration of air in a tire lumen formed by a wheel rim and a tire that is attached to the rim and in which air is introduced. Concerning solids.

One type of pneumatic tire and wheel assembly of this type is a tire lumen formed by a wheel rim and a tire that is mounted on the rim and into which air is introduced. There is one in which a sound control tool is arranged in a housing groove that is recessed in the direction (see, for example, Patent Document 1).
JP 2002-307905 A

  In the above-mentioned Patent Document 1, only the volume relationship with the tire lumen is defined for the noise suppression device, and the dimensional relationship with the accommodation groove is not defined. In such a case, the tip of the bead toe of the tire may be caught by the noise damper when the tire is attached to or detached from the rim of the wheel, and the noise damper may be damaged. Moreover, since there is no regulation about the shape of the upper end portion of the groove in the receiving groove, an edge may be formed at the upper end portion of the groove. In such a case, various problems may occur at the edge.

  The present invention has been made to cope with the above-described problems. In a tire lumen formed by a wheel rim and a tire that is attached to the rim and into which air is introduced, the well portion of the rim is formed. In a pneumatic tire and wheel assembly in which a sound dampening device is disposed in a housing groove recessed in the circumferential direction, the groove upper end of the housing groove is chamfered with an arc having a radius Rw> 0 mm, and the sound damping The thickness T measured perpendicular to the bottom surface of the receiving groove of the tool, the depth D measured perpendicular to the bottom surface of the receiving groove of the receiving groove, and the radius Rw are (D−Rw) ≧ T. There is a feature in.

  In this pneumatic tire and wheel assembly, since the groove upper end portion of the housing groove is chamfered with an arc having a radius Rw> 0 mm, a sharp edge can be prevented from being formed at the groove upper end portion of the housing groove. It is possible to avoid various problems due to the edge, and it is possible to improve the workability of assembling the noise control device to the wheel rim and the workability of assembling the tire to the wheel rim.

  Further, the thickness T measured perpendicular to the bottom surface of the housing groove of the sound control tool, the depth D measured perpendicular to the bottom surface of the housing groove of the housing groove, and the radius Rw are (D−Rw) ≧. The sound control tool when the tire is attached to and detached from the rim of the wheel can be prevented from projecting outward in the tire radial direction from the chamfering start point of the radius Rw in the accommodation groove. It is possible to improve workability by preventing the tire bead from being caught on the tire and to prevent the sound control tool from being damaged.

  In implementing the present invention, it is desirable that the thickness T of the sound control tool is 3 mm or more. In this case, it is possible to easily manufacture the noise damper, and it is possible to obtain the expected road noise reduction effect (sound absorption performance) by the noise damper. Further, the depth D of the receiving groove is preferably 15 mm or less. In this case, the brake size (brake performance) can be ensured by increasing the size of the tire and wheel by 1 inch compared to the case where the groove for accommodating the damping device is not provided in the circumferential direction in the well portion of the rim. This is possible, and it is possible to achieve both ensuring of brake size (brake performance) and suppression of wheel weight increase (wheel size increase).

  In carrying out the present invention, it is desirable that the radius Rw of the arc chamfered at the upper end of the receiving groove is 0.1 mm or more and 1.5 mm or less. In this case, it is possible to prevent a sharp edge from being formed at the upper end portion of the housing groove while ensuring a necessary and sufficient capacity for the sound damping device in the housing groove. In addition, it is possible to achieve both of the effects of avoiding various problems caused by the edges.

  In carrying out the present invention, the radius Rt of the arc formed at the tip of the bead toe of the tire is desirably 2.0 mm or more and 3.5 mm or less, and is 2.5 mm or more and 3.0 mm or less. preferable. In this case, it is possible to further improve workability at the time of attaching / detaching the tire to / from the rim of the wheel and prevent damage to the sound control device, while suppressing deterioration of the air retention property of the tire and deterioration of the anti-rim separation performance. Is possible.

In the practice of the present invention, the 25% compression hardness defined in 5.4 of JIS K6401 of the urethane material provided in the sound control tool is preferably ² N / cm ² or more and 20 N / cm ² or less. . In this case, the urethane material is not too soft, and it is possible to suppress the slip of the sound control tool against the wheel rim during actual use, and the urethane material is not too hard and the sound control tool is assembled to the wheel rim. At the same time, the noise control device is adapted to the rim shape, and the sound control device can be accurately assembled to the wheel rim.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an assembly A of a pneumatic tire and wheel according to the present invention. In this assembly A, a belt-like sound absorber 20 is detachably mounted on the outer periphery of a rim 11 of the wheel 10 and the tire. 30 is detachably mounted. An air valve 40 is detachably attached to the rim 11 of the wheel 10.

  This assembly A is used by being mounted on an axle of a vehicle, and road noise during running on the road surface is reduced by the noise control device 20. Road noise when traveling on the road surface is generated when the tire 30 is mounted on the rim 11 and air is resonantly vibrated in the tire lumen R formed by the air being introduced through the air valve 40 therein.

  As shown in FIGS. 1 and 2, the wheel 10 has a receiving groove 11 b in the well portion 11 a of the rim 11. The housing groove 11b is for housing the sound control device 20, has a required width W (see FIG. 1), a predetermined depth D (see FIG. 2), and is recessed in the circumferential direction. The upper end of the groove is chamfered with an arc having a radius Rw> 0 mm (see FIG. 2). In FIG. 2, the cross-sectional display of the rim 11 is omitted in order to clearly show the chamfering radius Rw of the upper end portion of the receiving groove 11 b.

The sound control tool 20 is mainly composed of open-cell urethane material, is formed in a strip shape with a predetermined thickness T (see FIG. 2), and is assembled so as to be wound around the outer periphery of the rim 11. 11 is accommodated in an accommodation groove 11b that is recessed in the well portion 11a, and is disposed on substantially the entire circumference. As the urethane material of the noise control device 20, a material having a 25% compression hardness of 2 N / cm ² or more and 20 N / cm ² or less as defined in 5.4 of JIS K6401 is desirable.

  In the case where the urethane material of the noise control device 20 is of the above-described 25% compression hardness, the urethane material is not too soft and suppresses the slip of the noise control device 20 with respect to the rim 11 of the wheel 10 during actual use. In addition, the urethane material is not too hard, and when the noise control device 20 is assembled to the rim 11 of the wheel 10, the sound control device 20 fits into the rim shape, and the sound control device 20 is accurately attached to the rim 11 of the wheel 10. It is possible to assemble.

  By the way, in this embodiment, as shown in FIG. 2, the groove upper end portion of the accommodation groove 11b is chamfered with an arc having a radius Rw> 0 mm, and is measured perpendicularly to the bottom surface of the accommodation groove of the noise damper 20. The thickness of the sound control tool 20 is set such that the thickness T, the depth D measured perpendicular to the bottom surface of the housing groove of the housing groove 11b, and the radius Rw satisfy the relationship (D−Rw) ≧ T. Each dimension of the length T, the depth D of the receiving groove 11b, and the chamfering radius Rw of the upper end of the receiving groove 11b is set.

  For this reason, it is possible to prevent a sharp edge from being formed at the upper end portion of the accommodation groove 11b, and various problems caused by the edge (damage of the noise control device 20 at the edge portion, injury of the operator, tire 30 to the wheel 10). When assembling and filling the tire 30 with air, it is possible to avoid problems such as a heel portion or a toe portion of the bead portion 31 of the tire 30 being caught on the edge portion, and the rim 11 of the wheel 10. It is possible to improve the workability of assembling the noise control tool 20 and the workability of assembling the tire 30 to the rim 11 of the wheel 10.

  In addition, as described above, the thickness T of the noise damper 20, the depth D of the receiving groove 11, and the chamfer radius Rw of the upper end of the receiving groove 11b are in a relationship of (D−Rw) ≧ T. It is possible to prevent the noise damping tool 20 from protruding beyond the chamfering starting point of the radius Rw in the housing groove 11b in the tire radial direction, and the noise damping tool 20 when the tire 30 is attached to and detached from the rim 11 of the wheel 10. It is possible to improve workability by preventing the tire bead portion 31 from being caught and to prevent the sound control device 20 from being damaged.

  In this embodiment, the thickness T of the noise damper 20 is desirably 3 mm or more from the evaluation results shown in Table 1 below (which are obtained by various experiments, analysis, considerations, etc.). When the thickness T of the noise control device 20 is set to 3 mm or more, the sound control device 20 can be easily manufactured, and the desired road noise reduction effect (sound absorption performance) by the sound control device 20 can be achieved. ) Can be obtained. Even if the thickness T of the noise control device 20 is 13 mm or more, there is no problem in the manufacturability of the sound control device 20 and the effect of reducing the road noise, but there is a possibility that a problem occurs in the manufacturability of the housing groove 11b.

  In this embodiment, the depth D of the receiving groove 11b is preferably 15 mm or less from the evaluation results shown in Table 2 below (which are obtained by various experiments, analysis, considerations, etc.). When the depth D of the housing groove 11b is set to 15 mm or less, the tire 30 and the wheel 10 are compared with the case where the housing groove 11b of the sound control tool 20 is not recessed in the circumferential direction in the well portion 11a of the rim 11. The brake size (brake performance) can be secured by increasing the size of the vehicle by 1 inch, and both securing the brake size (brake performance) and suppressing the weight increase of the wheel 10 (size increase of the wheel 10) can be achieved. Is possible. In addition, when the depth D of the housing groove 11b is set to be not less than a half of 1 inch (approximately 12.7 mm) and not more than 15 mm, it is necessary to reduce the thickness of the rim 11 by increasing the material strength of the well portion 11a. It is possible to secure the brake size (brake performance) by up 1 inch.

  Further, in this embodiment, the radius Rw of the arc chamfered at the upper end portion of the accommodation groove 11b is based on the evaluation results shown in Table 3 below (this is obtained by various experiments, analysis, considerations, etc.). It is desirable that it is 0.1 mm or more and 1.5 mm or less. When the radius Rw of the arc chamfered at the upper end portion of the housing groove 11b is set to 0.1 mm or more and 1.5 mm or less, the housing groove 11b has a necessary and sufficient storage volume for the noise control device 20. In addition, it is possible to prevent a sharp edge from being formed at the upper end portion of the housing groove 11b, and it is possible to achieve both the effect of reducing road noise by the noise control tool 20 and the effect of avoiding various problems due to the edge. .

  Further, in this embodiment, the radius Rt (see FIG. 3) of the arc formed at the bead toe tip 31a of the tire 30 was obtained by the evaluation results shown in Table 4 below (this was obtained through various experiments, analysis, considerations, and the like). From 2.0 mm to 3.5 mm, and preferably from 2.5 mm to 3.0 mm. In the case where the radius Rt is set to 2.0 mm or more and 3.5 mm or less, the tire 30 to the rim 11 of the wheel 10 is suppressed after the deterioration of the air retaining property of the tire 30 and the deterioration of the rim detachment performance are suppressed. It is possible to improve workability at the time of attaching and detaching 30 and prevent damage to the sound control tool 20. In FIG. 3, the rubber cross section of the tire 30 is not shown in order to clearly show the radius Rt of the arc formed at the bead toe tip 31a.

1 is a longitudinal front view illustrating an embodiment of a pneumatic tire and wheel assembly according to the present invention. FIG. 2 is a partial enlarged cross-sectional view of a wheel rim and a sound control tool shown in FIG. 1. It is an expanded sectional view of the bead part in the tire shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Wheel, 11 ... Rim, 11a ... Well part of rim, 11b ... Accommodating groove, 20 ... Noise control, 30 ... Tire, 31 ... Tire bead part, 31a ... Bead toe tip part, R ... Tire lumen

Claims (6)

  In a tire lumen formed by a wheel rim and a tire that is attached to the rim and in which air is introduced, a sound-damping tool is disposed in a housing groove that is recessed in the circumferential direction in the well portion of the rim. In the pneumatic tire and wheel assembly, the groove upper end portion of the housing groove is chamfered with an arc having a radius Rw> 0 mm, and the thickness T is measured perpendicular to the housing groove bottom surface of the sound control tool; A pneumatic tire and wheel assembly, wherein a depth D measured perpendicularly to a bottom surface of the housing groove of the housing groove and the radius Rw are in a relationship of (D−Rw) ≧ T.   2. The pneumatic tire and wheel assembly according to claim 1, wherein the thickness T of the noise control device is 3 mm or more.   The pneumatic tire and wheel assembly according to claim 1, wherein the depth D of the housing groove is 15 mm or less.   2. The pneumatic tire and wheel assembly according to claim 1, wherein the radius Rw is not less than 0.1 mm and not more than 1.5 mm. 3.   2. The pneumatic tire and wheel assembly according to claim 1, wherein the tire is formed in an arc having a radius Rt in the tire radial cross section, and the radius Rt is 2.0 mm or more. 3. A pneumatic tire and wheel assembly characterized by being 3.5 mm or less. 2. The pneumatic tire and wheel assembly according to claim 1, wherein the sound control device includes a urethane material, and has a 25% compression hardness defined in 5.4 of JIS K6401 of the urethane material. 3. a pneumatic tire and an assembly of a wheel, characterized in that at 2N / cm ² or more and 20 N / cm ² or less.

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