JPH0798442B2 - How to install dual wheel tires - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for mounting a multi-wheel tire, for example, mounting a multi-wheel tire in which a tire having a lateral groove is mounted on a multi-wheel in a vehicle such as a truck, a bus, or a trailer. Regarding the method.

(Prior Art) Traffic noise has become a social problem with the recent rapid progress of motorization, and therefore, there is an urgent need to reduce the noise of tires. Conventionally, it has been considered to reduce noise by changing the tread pattern, tire internal structure, constituent materials, etc., but wear resistance, separation resistance, etc. durability performance, slip resistance, steering stability, etc. Performance deteriorates significantly. It is very difficult to reduce the noise while maintaining the durability performance and the exercise performance, and the tires that are attached with importance to the durability performance and the exercise performance from the viewpoint of safety are running.

(Problems to be Solved by the Invention) However, such a tire that emphasizes durability performance and exercise performance generally has a large running noise, and in particular, has a problem that the noise of a compound tire mounted on a compound wheel is large. is there.

Therefore, it is an object of the present invention to provide a method for mounting a multi-wheel tire in which running noise is significantly reduced while sufficiently maintaining excellent durability performance and exercise performance.

(Means for Solving Problems) A method for mounting a compound tire according to the present invention is a compound tire mounting method in which two tires are mounted on a vehicle axle to compound wheels at a predetermined interval in the circumferential direction. Preparing two tires having a tread in which a plurality of lateral grooves that are arranged and extend substantially in the lateral direction are arranged on at least one side in the axial direction, and then the two tires so that the lateral grooves of both tires are both directed toward the inside of the vehicle. Are arranged and the center of each groove is aligned substantially parallel to the rotation axis of the vehicle and fixed to the axle.

Here, the lateral grooves may be so-called mono-pitch arrangements arranged at even intervals in the circumferential direction of the tire, or so-called variable pitch arrangements arranged at uneven intervals in the circumferential direction.

In addition to the lateral grooves, a so-called rib / lug type in which circumferential longitudinal grooves that are substantially parallel to the tire equatorial plane are formed, or
It may be a block type, which is formed by lateral grooves and vertical grooves.

Further, the lateral groove may be arranged on at least one side in the axial direction, and the other side may be a lateral groove or one or a plurality of grooves extending in the circumferential direction, for example, in a zigzag shape, and is composed of the circumferential groove and the lateral groove. It may be a rib / lug type, may be a block type formed of a lateral groove and a circumferential groove, and may have a flat surface portion not having a groove.

(Example) Hereinafter, an example of a method for mounting a multi-wheel tire according to the present invention will be described with reference to the drawings.

FIG. 1 is a partial plan view showing a first embodiment of a compound tire using the compound tire mounting method according to the present invention.

First, the configuration will be described. In FIG. 1, reference numerals 1 and 2 denote compound-wheel tires, and compound-wheel tires 1 and 2 are compound wheels (2) on one side (right side and / or left side) of a rear axle (not shown) of the vehicle. Book) attached. In these two tires 1 and 2, the tire 1 is arranged on the outer side, that is, on the side separated from the center of the vehicle, and the tire 2 is arranged on the inner side. The tire 1 is arranged at a pitch P (70 mm in this embodiment) at a predetermined interval in the circumferential direction, and a large number of lateral grooves 3 extending substantially in the rotational axis direction of the tire are arranged on at least one side (both sides in this embodiment). Have 5. Similarly to the tire 1, the tire 2 is arranged at intervals of a predetermined pitch P (70 mm in this embodiment) in the circumferential direction, and has a large number of lateral grooves 3 extending substantially in the lateral direction at least on one side (both sides in this embodiment). ). Here, the term “lateral groove” includes a groove extending in a direction perpendicular to the equatorial plane L ₅ or L _{6 as} well as a groove extending at a certain angle.
That is, it is a groove that extends in the direction across the tread.

When the tire is mounted on the axle of the vehicle on the compound wheel, two tires 1 and 2 having treads 5 and 6 in which the lateral grooves 3 and 4 are arranged on at least one side in the axial direction are prepared, and the lateral groove 3a inside the tire 1 is prepared. The lateral groove 4a on the inside of the tire 2 and the lateral groove 4a on the inner side of the tire 2 are arranged so as to be located on the side toward the center of the vehicle, that is, on the inner side, and the center of each of the lateral grooves 3a and 4a.
Secure the two tires 1 and 2 to the axle so that 3c and 4c are aligned substantially parallel to the axis of the vehicle's axis of rotation (not shown).

Further, in this embodiment, the lateral grooves 3 and 4 on the side where the tires 1 and 2 face each other are shifted by about 1/2 P pitch in the circumferential direction.

Next, a second embodiment of a compound tire using the compound tire mounting method according to the present invention will be described.

As shown in FIG. 4, the compound tires 21 and 22 of the second embodiment have lateral grooves 23 and 24, respectively, on the side ends of the respective treads 25 and 26 on the one axial side (the right side in the figure). 27
And 28, and there is no groove at the other side end. The groove center 23c of the lateral groove 23a and the groove center 24c of the lateral groove 24a on one side are substantially aligned with the axis parallel line A ₂ . The configuration other than the above is the same as that of the first embodiment.

It should be noted that, in the left half region of the tread without the lateral grooves in the tires 21 and 22, it is possible to arrange them in a generally circumferential direction, for example, one or a plurality of known zigzag shapes, corrugations, etc., at appropriate intervals.

Next, the operation will be described.

When a vehicle equipped with tires 1 and 2 on two wheels runs,
The sounds generated from the lateral grooves 3a and 4a of the tires 1 and 2 interfere with each other. In a certain traveling speed range, these sounds cancel each other out, approaching extremely low noise (so-called white noise), the peak value of the noise is lowered, and the noise of the multi-wheel tire is significantly reduced.

(Effect) Next, various test tires (tire size 10.00-2014PR) were prepared and tested to confirm the effect of the present invention.

In the first test, the first embodiment shown in FIG. 1 described above and
The comparative example 1 shown in FIG. 2 is a comparison of the arrangements of the comparative example 1 shown in FIG. 2. In the comparative example 1 shown in FIG. 2, the groove centers 13c and 14c of the grooves 13a and 14a of the tires 11 and 12 facing toward the vehicle are displaced from each other by 1 / 2P. Moreover, the centers of the lateral grooves of the tires 11 and 12 facing each other are aligned. The tread patterns, structures, and materials of these test tires were the same and were manufactured similarly.

In the test, these dual-wheel tires were installed in an indoor drum tester, run at different running speeds, and a microphone was installed at a position 1 m in the axial direction and 25 cm in height from the center S of the dual-wheel tires. The noise was measured with a noise tester.

As shown in FIG. 3, the test result shows that the first example has a lower noise level than the comparative example 1, and particularly the traveling speed is 80 km / H.
In the vicinity of, the noise level is significantly reduced by 10 to 15db (A).

The second test is a comparison of the arrangements of the second embodiment shown in FIG. 4 and the comparative example 2 shown in FIG. 5 described above. As shown in FIG. 5, the multi-wheel tires 31 and 32 of Comparative Example 2 have the lateral grooves 33 and 34 respectively formed on the side ends 37 of the respective treads 35 and 35 on the one axial side (the right side in the figure). And 38, and there is no groove at the other side end. Groove centers 33c and 34c of lateral grooves 33a and 34a on one side, respectively
As shown in FIG. 5, it is obtained by shifting only 1 / 2P ₃ circumferential groove pitch P _3. The tread patterns, structures, and materials of these test tires were the same and were manufactured similarly.

The test was carried out under the same test conditions as in the first test except that these compound wheel tires were installed on an ordinary indoor drum tester, and the direction of installation of the microphone was different. FIG. 6 shows the microphone measured from one side (in the right side of FIGS. 4 and 5 indicated by arrow B) in the axial direction of the compound tire, and FIG. 7 shows the other side (see FIGS. 4 and 5).
It is the measurement result of the noise level of the multi-wheel tire when measured from the left side of the figure, indicated by arrow C).

As shown in FIG. 6 and FIG. 7, when noise is measured from one side and the other side in the axial direction of the compound wheel tire, the compound wheel of the second embodiment using the method for mounting a compound wheel tire according to the present invention. The noise level of the tire is 60 to 90 as compared with that of Comparative Example 2.
In the speed range of km / H, it is also significantly reduced by about 5db (A).

As described above, according to the present invention, it is possible to significantly reduce running noise while sufficiently maintaining the excellent durability performance and exercise performance of the multi-wheel tire.

[Brief description of drawings]

FIG. 1 is a partial plan view showing a first embodiment of a compound tire using the compound tire mounting method according to the present invention.
FIG. 2 is a partial plan view of the compound tire of Comparative Example 1 used in the first test. FIG. 3 is a graph showing the noise level of the compound tire of the first test. FIG. 4 is a partial plan view showing a second embodiment of a compound tire using the compound tire mounting method according to the present invention. FIG. 5 is a partial plan view of a compound wheel tire of Comparative Example 2 used in the second test. 6 and 7 are graphs showing the noise level of the compound tire of the second test. 1,2,21,22 …… Multi-wheel tires 3,4,23,24 …… Side grooves, 3c, 4c, 23c, 24c …… Groove center 5,6,25,26 ……
tread.

Claims (1)

[Claims] 1. A method for mounting a multi-wheel tire in which two tires are mounted on a vehicle axle on a compound wheel, wherein a plurality of lateral grooves arranged at predetermined intervals in the circumferential direction and extending substantially laterally are provided on at least one side in the axial direction. Two tires having the arranged treads are prepared, and then the two tires are arranged so that both the lateral grooves of both tires face the inside of the vehicle, and the center of each groove is almost the rotation axis of the vehicle. How to install compound wheel tires aligned in parallel and fixed to the axle.