JPH0565004A - Safety tire incorporating core wheel and run-flat alarming method - Google Patents

Abstract

PURPOSE:To improve safety when run-flat occurs owing to a puncture and leakage of air and to alarm the occurrence of run-flat to a driver through simple structure and reliably. CONSTITUTION:A core wheel 10 is incorporated in a safety tire 12, and the core wheel 10 is composed of three arcuate members 11. Each arcuate member 11 of the core wheel 10 is formed of a material, such as cast iron, an aluminum alloy, resin, having high rigidity. Protrusion parts 20 for generating vibration toward the inner peripheral surface 18A of the crown part 18 of a safety tire 12 are formed on the tread part 11C of each arcuate member 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety tire having a core wheel and a run-flat warning method.

[0002]

2. Description of the Related Art Heretofore, some techniques have been known as techniques for improving safety during tire puncture or run-flat due to air leakage.

For example, in Japanese Utility Model Publication No. 47-6571, when the internal pressure of a tire decreases and falls below a reference pressure set by a pressure adjusting spring, the gas held in a gas accumulator blows off the whistle. It sounds and sounds an alarm.

However, this wheel tire pressure alarm has a drawback that the adjustment of the pressure adjusting spring for determining the reference internal pressure is apt to be distorted by the vibration and impact of the tire wheel during traveling. Further, the gas in the gas accumulator may not be maintained at a predetermined pressure for a long time.

Further, in Japanese Unexamined Patent Publication (Kokai) No. 48-26186, a device for detecting a tire side strain by a strain detector equipped with a radio transmitter to warn an abnormal deformation of the tire, and a diaphragm valve attached to the tire. A device for detecting and warning an abnormal tire pressure with a pressure detector is shown.

However, in this pneumatic tire pressure reduction automatic detection device, the signal transmitted from the radio transmitter is
There is a problem that electric noise from the outside is easily received and that the adjustment of the pressure adjusting spring that establishes the reference internal pressure inscribed in the diaphragm valve type pressure detector is apt to be deviated due to vibration and impact during running of the tire wheel.

Further, in Japanese Patent Publication No. 57-57285, the tip of the hammer of the internal pressure warning device and the inner surface of the tire tread come into contact with each other at the time of puncture or low pressure, and the hammer hammer strikes the impact table to give an alarm. A warning device for a tire pressure drop that occurs is shown.

Further, in Japanese Utility Model Publication No. 54-9765,
Puncture warning of a tubeless tire in which the inside of the tire tread comes into contact with the protrusion of the alarm device at the time of puncture or low pressure so that the striking head connected to the protrusion hits the well bottom of the wheel rim to produce continuous abnormal noise. The device is shown.

However, these tire pressure drop warning devices and puncture warning devices for tubeless tires have insufficient durability, and once run-flat, they are damaged immediately and cannot be used thereafter. Also,
If the vehicle travels on a road with severe irregularities, false alarms may occur, and it is difficult to distinguish between flat or low pressure and irregularities on the road surface. Further, there is a problem that the installation of the alarm device is complicated and difficult, and that the installation of the alarm device impairs the balance of the entire tire wheel and deteriorates the vibration characteristics around the vehicle.

[0010]

In consideration of the above facts, the present invention improves the safety at the time of run-flat due to puncture or air leakage, and provides the driver with a simple structure and sure run-flat. It is an object to obtain a safety tire equipped with a core wheel capable of warning and a run-flat warning method.

[0011]

The present invention according to claim 1 is intended to support the load applied to a tire and to run-flat when the tire has a flat tire during running or when the internal pressure is low due to air leakage. In a safety tire in which a plurality of arc-shaped members are connected to form a ring shape and a core wheel is inserted inside the tire and provided on a bottom side portion of a wheel rim, vibration occurs in at least one tread portion of the arc-shaped member. It is characterized in that a convex portion for generation is provided.

The present invention according to claim 2 provides the invention according to claim 1.
In the invention described above, the convex portion is provided to each arc-shaped member such that the weight is distributed symmetrically with respect to the circumferential center dividing surface of the arc-shaped member and the weight of each arc-shaped member is equal. It has a feature.

Further, according to the present invention as set forth in claim 3, when the tire is run-flat, the convex portion provided on the tread surface of the arc-shaped member constituting the core wheel comes into contact with the road surface through the tire. The feature is that the generated vibration or noise is detected and the vehicle driver is informed of the run flat.

[0014]

In the safety tire incorporating the core wheel of the present invention according to claim 1, in order to support the load applied to the tire by the core wheel at the time of run-flat due to puncture or air leakage,
It is possible to improve the safety at the time of run flat due to puncture or air leakage. Further, at the time of run-flat, vibration and noise are generated by the vibration generating projections provided on at least one tread surface of the arc-shaped member of the core wheel coming into contact with the road surface through the tire, which causes run-flat. The driver is warned. Therefore, with a simple structure, it is possible to warn the driver that the run-flat is sure.

Further, in the safety tire in which the core wheel of the present invention according to claim 2 is installed, the weight of each arc-shaped member is distributed while the convex portion is distributed to the circumferential center divided surface of the arc-shaped member. Since the convex portions are provided on the respective arc-shaped members so that they are equal to each other, the convex portions do not cause the core wheel to be unbalanced.

Further, in the run-flat warning method of the present invention according to claim 3, when the safety tire is run-flat, the convex portion provided on the tread surface of the arc-shaped member forming the core wheel intervenes the tire. Vibration or noise caused by contact with the road surface is detected by, for example, a vibration sensor attached to the vehicle body outside the safety tire or a noise sensor, and a monitor connected to these sensors is provided near the driver's seat to drive the vehicle. Can inform the person that it is a run flat. Therefore, it is possible to improve the safety at the time of runflat due to puncture or air leakage, and to warn the driver that the runflat is reliable with a simple structure.

[0017]

EXAMPLE An example of a safety tire having a core wheel according to the present invention will be described with reference to FIGS.

As shown in FIG. 1, the safety tire 12 (tire size 155 / 65R13) of this embodiment has an outer diameter of 5
It has a width of 30 mm and a width of 160 mm, and the core wheel 10 is installed therein.

As shown in FIG. 4, the core wheel 10 is composed of at least two (three in this embodiment) arc-shaped members 11 as is well known, and both ends 11A of each arc-shaped member 11 are formed. , 11B are piled up and connected to each other to be assembled into an annular shape.

As shown in FIGS. 2 and 3, the core wheel 1
The cross-sectional shape when viewed from the circumferential direction of 0 is an I (eye) shape, and the inner peripheral surface has a rim 14 to which the bead portion 12A of the safety tire 12 is fixed (well diameter 320 mm, rim width 11
4 mm) well portion 14A is rotatably fitted to the outer peripheral surface of the well portion 14A. The core wheel 10 is made of a material having high rigidity, such as cast iron,
It is made of aluminum alloy, resin, etc., and its outer peripheral surface 10
B corresponds to the center portion of the inner peripheral surface 18A of the crown portion 18 of the safety tire 12 in the tire width direction.

As shown in FIG. 1, on the tread portion 11C of each arcuate member 11 of the core wheel 10, the convex portion 2 for generating vibration is directed toward the inner peripheral surface 18A of the crown portion 18 of the safety tire 12.
0 is integrally molded. The height of the convex portion 20 is set in advance according to the strength of the core wheel 10, the strength inside the safety tire 12, and the predicted amplitude of vibration, and is 5 mm to 1 mm.
0 mm is preferred.

As shown in FIG. 2, in this embodiment, the width W2 of the tread portion 11C of each arc-shaped member 11 is 70 mm, and the width W1 of the convex portion 20 is 60 mm.
Further, the outer diameter D of the core wheel 10 is 420 mm (the inner diameter is 320 mm).
mm), and the height H of the convex portion 20 is set to 10 mm.

As shown in FIG. 1, the tread portion 11C of each arcuate member 11 of the core wheel 10 is provided with one, two, or three convex portions 20. Individual or 3
The individual convex portions 20 are weight-distributed to the respective circumferential center division surfaces S of the arc-shaped members 11. Further, the lengths L1, L2, and L3 of the one, two, or three convex portions 20 are determined so that the weights of the arc-shaped members 11 are equal.

Next, the operation of this embodiment will be described. In the present embodiment, during normal traveling, the core wheel 10 rotates integrally with the rim 14 due to the friction between the inner peripheral surface and the outer peripheral surface of the well portion 14A of the rim 14. When the internal pressure of the safety tire 12 decreases due to puncture or the like, the safety tire 12 is crushed on the ground contact side (the lower side of FIG. 1) as shown in FIGS. 1 and 3, and the core wheel 10 interposes the crown portion 18 therebetween. Contact road surface 15.

At this time, the core wheel 10 supports the crown portion 18 of the safety tire 12 from the inside so as to prevent it from being crushed,
The safety tire 12 can be run flat in a state where the internal pressure is lowered, and the force applied from the safety tire 12 causes the safety tire 12 to slide on the outer peripheral surface of the well portion 14A of the rim 14 to rotate. As a result, it is possible to improve the safety during run-flat due to puncture or air leakage.

Further, in this embodiment, at the time of run-flat, the vibration-generating convex portion 20 provided on the tread surface portion 11C of the arc-shaped member 11 of the core wheel 10 comes into contact with the road surface 15 through the safety tire 12. By doing so, vibration and noise are generated. The characteristic of this vibration and noise is that, as shown in FIG. 5, it has a repeating amplitude of a predetermined period T1 to T5 corresponding to each convex portion 20, whereby the driver is caused by unevenness of the road surface. It is easy to distinguish it from vibration and noise, and it is possible to reliably detect that it is a run flat. In particular, when the vehicle speed is constant, this periodicity is ensured, so that it is easy to detect. Further, when the vehicle is at a high speed, the generated vibration and sound can be electrically converted and detected to facilitate the determination.

Further, in the present embodiment, the weight of the convex portion 12 is distributed to the object with respect to the central dividing surface S in the circumferential direction of the arc-shaped member 20, and the convex portions 20 are equalized so that the weights of the respective arc-shaped members 11 are equal. Since the protrusions 20 are provided, the core wheel 10 does not become unbalanced.

Further, in this embodiment, the core wheel 10 is used.
Since each arc-shaped member 11 and the convex portion 20 are integrally molded of a material having high rigidity, for example, cast iron, aluminum alloy, resin, etc., even if the run-flat is continued under an excessive load, each arc-shaped member 11 and The function of the safety tire can be maintained for a long time without damaging the convex portion 20.

In the above embodiment, the convex portions 20 are weight-distributed to the circumferential center division surface S of the arc-shaped member 11, and the weights of the arc-shaped members 11 are equal to one and two. Although three or three convex portions 20 are provided, the arrangement of the convex portions 20 is not limited to this, and the same number of convex portions 20 may be provided on all arc-shaped members 11, for example, all arc-shaped members 1
When one convex portion 20 is provided in one, the characteristics of vibration and noise are that, as shown in FIG. 6, it has a repeating amplitude of a predetermined cycle T corresponding to each convex portion 20. Become.

Next, an embodiment of the run-flat warning method of the present invention will be described with reference to FIG. As shown in FIG.
In the present embodiment, the vibration for detecting the vibration or noise generated when the convex portion 20 provided on the tread portion 11C of the arc-shaped member 11 constituting the core wheel 10 comes into contact with the road surface 15 with the tire 12 interposed therebetween. The sensor 24 is the safety tire 1
2 is provided on the axle cover 26 mounted. In addition, the vibration sensor 24 is provided on the monitor 2 provided in the driver's seat.
8 is connected.

Therefore, when the safety tire 12 is run-flat, the vibration sensor 24 detects the vibration or noise of the axle cover 26 caused by the projection 20 of the arc-shaped member 11 coming into contact with the road surface 15 through the safety tire 12. It is possible to detect it and inform the vehicle driver of the run-flat condition by the monitor 28 provided near the driver's seat. Therefore, unlike the prior art, it is not necessary to provide a sensor inside the tire, and it is possible to reliably warn the driver that the run is flat with a simple structure.

[0032]

Since the present invention has the above-mentioned structure, it is possible to improve the safety at the time of run-flat due to puncture or air leakage, and to warn the driver that the run-flat is simple and reliable. It has an excellent effect that it can be done.

[Brief description of drawings]

FIG. 1 is a cross-sectional view taken along the tire circumferential direction showing a safety tire incorporating a core wheel according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a perspective view showing a core wheel of a safety tire in which a core wheel according to an embodiment of the present invention is installed.

FIG. 5 is a conceptual diagram showing noise or vibration generated by a safety tire incorporating a core wheel according to an embodiment of the present invention.

FIG. 6 is a conceptual diagram showing noise or vibration generated by a safety tire incorporating core wheels according to another embodiment of the present invention.

FIG. 7 is a schematic configuration diagram showing a run-flat warning method according to an embodiment of the present invention.

[Explanation of symbols]

 10 Core Wheel 11 Arc Member 11C Tread 12 Safety Tire 20 Convex 24 Vibration Sensor 26 Axle Cover 28 Monitor

Claims (3)

[Claims] 1. A plurality of arc-shaped members are connected to form a ring shape in order to support a load applied to the tire when the tire has a flat tire during running or when the internal pressure is low due to air leakage and to run flat. A safety tire incorporating a core wheel that is inserted into the tire and provided on the bottom side of a wheel rim, characterized in that at least one tread portion of the arc-shaped member is provided with a convex portion for vibration generation. Safety tire with core wheels. 2. The weight distribution of the convex portion to the circumferential center division surface of the arc-shaped member, and the convex portion provided on each arc-shaped member so that the weight of each arc-shaped member becomes equal. A safety tire having a core wheel as an interior according to claim 1. 3. When the tire is run-flat, the vehicle driving is performed by detecting the vibration or noise generated when the convex portion provided on the tread surface of the arc-shaped member forming the core wheel comes into contact with the road surface through the tire. A run-flat warning method, which comprises notifying a person of a run-flat.