JPS6123449Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wheel consisting of a pneumatic tire and a rim.More specifically, the present invention relates to a wheel consisting of a pneumatic tire and a rim, and more specifically, a wheel consisting of a pneumatic tire and a rim, which allows the vehicle to continue running even if the tire becomes punctured while driving. This is related to the improvement of.

Conventional pneumatic tires had the disadvantage that if the tire was temporarily driven with a flat tire, the tire would deflect excessively, causing the sidewall of the tire to break after just a few kilometers of driving.

In order to eliminate this drawback, it has been proposed to strengthen the sidewall portion of the tire by thickening it. However, in the case of this tire, the tire casing is stiff, so it is not only difficult to incorporate it into a normal drop center rim, but also the bead part of the tire can easily break from the drop center rim due to lateral loads while driving. Problems also occurred when the rim flange fell into the center area (well area) and the rim flange came into contact with the road surface, making it impossible to drive or having to drive extremely unstable.

Therefore, as mentioned above, in order to improve the difficulty of assembling the rim of a wheel in which a tire reinforced by thickening the tire sidewall and incorporating it into a drop center rim, and the disadvantage of the bead part coming off when driving with a flat tire, we Recently, methods of filling the well of the rim, using a two-piece rim, or creating a protrusion or recess between the bead seat of the rim and the well, and the bead of the tire is locked to this protrusion or recess. Measures have been proposed to make this possible.

However, the current situation is that all of these methods not only increase the time required to assemble the rim, but also have problems such as increased weight and cost due to additional parts.

An object of the present invention is to solve the above-mentioned problems and provide a wheel consisting of an excellent pneumatic tire and rim, which is easy to assemble, and whose bead part is less likely to come off when driving with a flat tire.

Hereinafter, the present invention will be explained in detail by way of examples with reference to the drawings.

The figure is a cross-sectional explanatory view of a wheel consisting of a pneumatic tire and a rim according to an embodiment of the present invention.

In the figure, E is a wheel consisting of a pneumatic tire and a rim according to an embodiment of the present invention, and both sidewall portions 2 and 3 of the tire 1 are reinforced so that even when a load is applied when the air pressure is 0, the wheel is not completely damaged. A tire 1 that does not collapse, flange portions 21 and 22 at both ends, bead seat portions 23 and 25 adjacent to each of the flange portions 21 and 22, and the bead seat portion 23,
The drop center rim 20 is composed of a well portion 24 provided between the drop center rim 25 and the width R between the flange portions 21 and 22 of the drop center rim 20, and the width R between the flange portions 21 and 22 of the drop center rim 20. The ratio R/T of the cross-sectional width T of the tire 1 when it is assembled into the drop center rim 20 and inflated is
0.95 or less, and the wheel E is integrally joined to the drop center rim 20.
When attached to the wheel mounting portion 31 of a vehicle (not shown) through The relationship between WW and the width BW of each bead portion 4 and 5 of the tire 1 is 3.0≦WF/BW, 1.5≦WR/BW≦2.5, 2.0
≦WW/BW.

To explain further, in the tire 1, both sidewall parts 2 and 3 are reinforced and have a large wall thickness, and as mentioned above, even when the tire air pressure becomes 0, the rigidity of the sidewall parts 2 and 3 is increased. The tire 1 is molded so that it can support the load in the longitudinal direction and will not completely collapse. This rigidity can be achieved by increasing the wall thickness of the sidewall parts 2 and 3, for example by adding a rubber layer or a fiber reinforcing layer between the inner and outer surfaces of the sidewall parts 2 and 3 or between the carcass plies, or by adding rubber. There are means to increase the rubber hardness of the layer.

In addition, as described above in the present invention, the width R between the flanges 21 and 22 of the drop center rim 20, and the cross-sectional width T of the tire 1 when the tire 1 is assembled into the drop center rim 20 and inflated. The reason why the ratio R/T was set to 0.95 or less was because of this R/T
If the value of is 0.95 or more, there is a risk that the bead portions 4 and 5 will separate from the flange portions 21 and 22 due to lateral force during driving, especially when taking a sharp curve, and the internal pressure of the tire 1 may suddenly leak. Because there is.

Furthermore, as mentioned above in the present invention, the wheel E
When the wheel is attached to the vehicle mounting portion 31 of the wheel via the disk 30 integrally joined to the drop center rim 20, the width WF of the bead seat portion 23 located on the outside of the vehicle is the bead portion 4 of the tire 1. width
Since 3.0≦WF/BW is set for BW, if the tire 1 is punctured and the internal pressure is released while driving, the bead portion 4 will move to the flange portion 21.
Even if a tendency to separate from the rim 20 occurs, the movement of the bead portion 4 remains within the range of the bead seat portion 23 of the rim 20, and there is no fear that the bead portion 4 falls into the well portion 24 of the rim 20. Furthermore, even if the bead portion 4 moves to the well portion 24 due to a large lateral force temporarily applied to the bead portion 4, it is repelled by the rigidity of the sidewall portion 2 reinforced as described above, and the bead portion 4 is restored to the proper position of the bead seat portion 23 of the rim 20 again.

Furthermore, when this wheel E is attached to a vehicle, the width WR of the bead seat 25 located inside the vehicle is set to 1.5≦WR/BW≦2.5 with respect to the width WR of the bead portion 5 as described above in the present invention. Even if the tire 1 is driven with a flat tire, the inner bead portion 5 has a smaller tendency to separate from the flange portion 22 than the aforementioned outer bead portion 4, so the lateral force acting on the inner bead portion 5 is smaller. Since the force is smaller than the lateral force acting on the outer bead portion 4, the width WR of the inner bead seat portion 25 is set to the outer bead seat portion 2 described above.
The width is made smaller than the width WF of tire 1, making it easier to assemble the rim of tire 1. Therefore, in the wheel E of the present invention, when the tire 1 is assembled into the rim 20, it is better to install it from the back side of the rim 20.

Furthermore, as described above in the present invention, the width WW of the well portion 24 of the drop center rim 20 is set to 2.0≦with respect to the width BW of the bead portions 4 and 5 of the tire 1.
The reason for choosing WW/BW is that when assembling the tire 1 into the rim 20, if the width WW of the well portion 24 is less than twice the width BW of the bead portions 4 and 5, the rim assembly work will be difficult. .

In addition, in order to easily perform the rim assembly work,
The depth of the well portion 24 is set to the flange portions 21 and 22.
It is desirable to set the value to approximately the same as the height of .

As mentioned above, the present invention is designed to keep the ratio R/T of the width R between both flanges of the drop center rim and the cross-sectional width T of the tire when the tire is assembled into the drop center rim and inflated to 0.95 or less. Since the,
It is possible to sufficiently seal the tire internal pressure between the bead part and the bead seat, allowing the tire to exhibit its full performance. It is possible to prevent the tire from separating from the flange portion and causing the internal pressure of the tire to suddenly leak.

In addition, when the wheel is attached to the vehicle,
The relationship between the width WF of the bead seat portion of the drop center rim located on the outside of the vehicle, the width WR of the bead seat portion located on the inside, the width WW of the well portion, and the width BW of the bead portion of the tire is set as follows: (1) 3.0≦WF/BW. Therefore, even when the tire is driven with an internal tire pressure of 0 due to a puncture or the like and when turning a corner, the bead portion located on the outside of the vehicle will not come off the bead seat.

(2) Since 1.5≦WR/BW≦2.5, the task of assembling the tire rim can be significantly facilitated.

(3) Since 2.0≦WW/BW, the above 1.5≦WR/
Coupled with the fact that BW≦2.5, it is possible to further simplify the task of assembling the tire rim.

Therefore, unlike the conventional wheels mentioned above, the present invention does not require the addition of a special device to prevent the bead from falling off, and the rim is also integrated, making it easier to assemble the tire rim. be able to.

[Brief explanation of the drawing]

The figure is a cross-sectional explanatory view of a wheel consisting of a pneumatic tire and a rim according to an embodiment of the present invention. 1... Tire, 2, 3... Sidewall part,
20... Drop center rim, 21, 22...
Flange part, 23, 25...Bead seat part, 2
4...well part.

Claims (1)

[Claims for Utility Model Registration] A tire that does not completely collapse even when a load is applied with zero air pressure by reinforcing the sidewall of the tire, flanges at both ends, and bead sheets adjacent to the flanges. and a well section provided between the bead seat section, the width R between both flange sections of the rim, and the width R of the tire installed in the drop center rim. The ratio R/T of the tire cross-sectional width T when inflated is 0.95 or less, and when the wheel is attached to a vehicle, the width WF of the bead seat portion of the drop center rim located on the outside of the vehicle. A wheel consisting of a pneumatic tire and a rim, characterized by having the following relationship between the width WR of the inner bead seat portion, the width WW of the well portion, and the width BW of the tire bead portion. 3.0≦WF/BW 1.5≦WR/BW≦2.5 2.0≦WW/BW