JP2000062408A - Road noise suppressing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a pair of shielding bodies in the symmetrical positions of a rib without losing weight balance, and to effectively reduce road noises without generating any vibration. SOLUTION: This road noise suppressing device is fixed in a tire internal space H surrounded with a tire 3 and a rim 2. In this case, a pair of shielding bodies 9 and 9 made of sponge materials and adapted to divide the tire internal space H roughly in two parts in a circumferential direction are connected by a connecting member 10. The connecting member 10 is extended to have a tension along a rim bottom 2B to fix the shielding bodies 9 to the rim 2.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road noise suppressing device capable of reducing road noise of tires and achieving quietness during running. 2. Description of the Related Art In recent years, there has been a strong demand for low noise and quietness of passenger cars. For that purpose, it is necessary to reduce tire noise. [0003] Known noises due to tires include pattern noise based on a tread pattern, squeaking noise between a road surface, and slipping noise, and so-called road noise peaking in a low frequency range around 250 Hz during running. This is a muffled noise in the vehicle, which has a great effect on the driver, causing discomfort to the driver. [0004] This road noise is caused by the impact on the tread surface received from the unevenness of the road surface resonating the air in the tire cavity. Particularly, in a radial tire in which the tread portion is reinforced with a belt layer such as a steel cord. Notably occurs. Therefore, conventionally, measures such as changing tread rubber or a belt layer to reduce tread rigidity and alleviating tread impact have been taken on the tire structure side, but road noise should be sufficiently reduced. Was difficult. On the other hand, as proposed in Japanese Patent Publication No. 7-14682 and the like, road noise can be effectively reduced by inserting a shield into the tire cavity to block an air column in the tire cavity. It is clear that [0006] However, even if such a shield is inserted in a compressed state, such a shield deteriorates the weight balance of the tire such as moving in the tire cavity during running and causes vibration. There is a new problem that occurs. Accordingly, the present invention provides a method of connecting a pair of sponge shields at an angle of about 180 degrees and using a connecting member extending with tension along the rim bottom and fixing the shield to the rim. Basically, it is an object of the present invention to provide a road noise suppression device capable of fixing a pair of shields at symmetrical positions of a rim without impairing weight balance, and effectively reducing road noise without causing vibration. And [0008] In order to achieve the above object, the present invention provides a tire mounted on a rim and a road noise suppression device mounted in a tire bore surrounded by the rim. A pair of shields made of a sponge material and capable of substantially dividing the tire lumen into two in the circumferential direction by blocking at least a part of the tire lumen at an angle of about 180 degrees; A connection member for connecting the body and extending with tension along the rim bottom to fix the shield to the rim. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a road noise suppression device 1.
FIGS. 2 and 3 are road noise suppression devices 1.
Tire equator C indicating that the tire is mounted in the tire bore H
And a cross-sectional view along a meridian. Here, the tire bore H is an annular space surrounded by the tire 3 mounted on the rim 2 and the rim 2, and the tire 3 has a tread portion 5 forming a ground contact surface.
And sidewall portions 6 extending radially inward from both sides thereof, and bead portions 7 formed at the inner ends of the respective sidewall portions 6. The bead portions 7 are seated on the rim seat 2A of the rim 2. It is fitted. In this example, the tire 3 has a tire bore H
By forming a tubeless structure in which the inner surface facing the inner surface is covered with an inner liner made of air-impermeable butyl rubber, the tire cavity H is formed airtight. In this example, the tire 3 is for a passenger car,
In addition, it can be used for various applications such as for heavy load vehicles such as buses and trucks, for small trucks, for motorcycles, etc.
Various well-known tire structures such as radial, semi-radial, and bias may be used. Next, the road noise suppression device 1 is formed of a pair of shields 9 and 9 and a connecting member 10 for connecting the pair of shields 9 and 9 and fixing the shield to the rim 2. The shield 9 is a block formed of a sponge material which is a porous rubber material.
It is located at a point symmetrical position separated by an angle of degrees,
By blocking at least a part of the tire lumen H,
The tire bore H is substantially divided into two circumferential air chambers H1 and H2. This prevents air column resonance near the above 250 Hz. From the viewpoint of preventing air column resonance, the shield 9 needs to block 60% or more of the cross-sectional area of the tire cavity H, preferably 80% or more, and furthermore, in this embodiment. As exemplified, it is preferable that the tire substantially adheres to the inner surface of the tire and is almost completely blocked. For this reason, so-called sponge rubber having open cells, which has excellent elasticity and shrinkage and facilitates deformation along the tire lumen H, is preferably employed as compared with so-called expanded rubber having closed cells. You. In addition, in the shield 9, it is necessary to suppress an increase in tire weight and to prevent the tire from being easily deformed as the tire is deformed at the time of contact with the ground and causing unevenness in tire stiffness. Rubber is preferred. The expansion ratio is 40
A higher value is preferable in the range of 0 to 1500%. Although the shield 9 is illustrated as a rectangular block in this embodiment, it may be formed in a contour shape in consideration of the compression amount in accordance with the shape of the tire cavity H. The connecting member 10 includes a pair of shields 9,
The shields 9 and 9 are fixed to the rim by forming a string connecting the rims 9 and extending with tension along the rim bottom 2B. In this embodiment, the connecting member 10 comprises an endless band body 11 having elasticity. The connecting member 10 extends through the shielding body 9 and is firmly connected to the shielding body 9 at the penetrating portion 12 by using an adhesive. It is stuck to. Connecting member 1
As 0, for example, a rubber elastic body having a diameter of about 1 cm can be suitably used, but various thicknesses and cross-sectional shapes can be used according to the rim size rim shape and the like. Can also be formed.
In addition, elasticity may be imparted by forming a part of the connecting member 10 with the rubber elastic body or the spring elastic body. In such a case, the remaining part is formed of an inelastic cord such as a synthetic resin. sell. As described above, by forming the connecting member 10 from the elastic body, the road noise suppressing device 1 can be mounted inside the rim bottom 2B over the rim flange 2C, and the tension after mounting is reduced. With rim bottom 2B
Can be fixed to Therefore, it is possible to prevent the shield 9 from being displaced during traveling and deteriorating the weight balance of the entire wheel. Even if the device 1 is misaligned, the pair of shields 9, 9 are connected to each other at symmetrical positions, so that the deterioration of the weight balance can be minimized. In order to stably generate the tension, it is preferable that substantially the entire connecting member 10 is formed of an elastic body,
Further, it is preferable that the circumferential length of the connecting member 10 before mounting is suppressed to 90% or less of the circumferential length of the rim bottom. As shown in FIG. 4, the connecting member 10 may be provided with a break 13 between the shields 9 and 9 and a connecting means 14 connectable to the break 13.
In this example, as the connecting means 14, a plurality of sawtooth-shaped grooves 15 are formed in one of the strip-shaped connecting member pieces 10A made of synthetic resin such as nylon, and the other connecting member piece 10B is formed.
In addition, a slide hole 16 having a claw piece 16A that allows one of the connecting member pieces 10A to be slidably inserted and that prevents engagement by engaging with the groove 15 is provided. As a result, the connecting member pieces 10A and 10B can be connected with tension, and in such a case, the use of the rubber elastic body or the spring elastic body can be eliminated, but it may be used. As described above, the road noise suppression device 1 of the present invention can be changed to various modes. Since the present invention is configured as described above,
The pair of shields can be fixed at symmetric positions of the rim without impairing the weight balance, and road noise can be effectively reduced without causing vibration.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a road noise suppression device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view along a tire equator showing a state where the tire is mounted in a tire lumen. FIG. 3 is a meridional sectional view thereof. FIG. 4 is a perspective view showing an example of a connecting means. [Description of Signs] 2 Rim 2B Rim bottom 3 Tire 9 Shield 10 Connecting member H Tire bore

Claims (1)

Claims 1. A road noise suppression device mounted in a tire bore surrounded by a rim mounted on the rim and the rim, the device comprising a sponge material and having an angle of about 180 degrees. A pair of shields capable of substantially dividing the tire lumen into two in the circumferential direction by blocking at least a part of the tire lumen with a gap between the pair of shields and having a tension along the rim bottom. A road noise suppression device, comprising: a connecting member that fixes the shielding body to a rim by extending.