JP3428682B2 - Safety wheels and their cores - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety wheel in which a core is mounted on a wheel for enabling a minimum running even when the tire is flat, and a core thereof. The present invention relates to a safety wheel and a core thereof, in which the distribution of contact pressure on the inner surface is made uniform, damage to the inner surface of the tire is reduced, and durability of the core and ride comfort during traveling in a punctured state are improved.

[0002]

2. Description of the Related Art In a wheel equipped with a pneumatic tire, if the tire is punctured during running, it suddenly becomes impossible to run, which is dangerous, and it is difficult to move to a repair place such as a gas station as it is. .
Therefore, there has been proposed a safety wheel in which a core is attached to the outer peripheral surface of the rim of the wheel and the punctured tire is supported from the inside by the core.

However, in a safety wheel having a core fixed to the outer peripheral surface of the rim, slippage occurs at the contact portion between the inner surface of the tire and the core due to the difference between the tire circumference in the punctured state and the core circumference. There is a drawback that the inner surface is easily damaged. As the above-mentioned core, a T-shaped or I-shaped cross-section has been proposed from the viewpoint of weight reduction.
In the letter-shaped or I-shaped core, an inner ring along the outer peripheral surface of the rim and an outer ring located radially outside the inner ring are joined by a rib member extending in the circumferential direction at the center portion in the width direction. Therefore, the load received from the road surface is mainly applied only to the central portion where the rib members are connected, and the contact pressure distribution between the tire inner surface and the core cannot be made uniform, which promotes damage to the tire inner surface. To do. Moreover, since such a core has low rigidity in the lateral direction (width direction), its durability against load is insufficient.

Further, between the inner ring and the outer ring,
It has been proposed that the contact pressure distribution of the core be made uniform by arranging a plurality of web members extending in the width direction so as to be substantially perpendicular to the inner ring at substantially constant intervals in the circumferential direction. In this case, since the rigidity difference in the circumferential direction increases due to the presence of the web member, there is a drawback that a rugged feeling is given when traveling in a punctured state, and riding comfort is deteriorated.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to make the contact pressure distribution of the core uniform, reduce the damage to the inner surface of the tire, and improve the durability of the core and the riding comfort in a punctured state. The purpose is to provide a safety wheel and its core.

[0006]

A safety wheel of the present invention for achieving the above object is a wheel in which a pneumatic tire is mounted on a wheel, and an inner ring extending along an outer peripheral surface of a rim of the wheel, and an inner ring extending from the inner ring. The outer ring located on the outer side in the radial direction includes a pair of left and right rib members extending in the circumferential direction at both ends in the width direction, and extending in the circumferential direction between the pair of left and right rib members, and in one direction with respect to the radial direction. the core constituted by binding by the inclined obliquely rib member, the oblique Li
The connecting position of the outer member and the outer ring is
It is characterized in that it is mounted on the wheel so as to be on both outer sides .

Further, the core of the present invention includes a pair of left and right inner rings extending along the rim outer peripheral surface of the wheel, and an outer ring positioned radially outside the inner ring, extending in the circumferential direction at both ends in the width direction. and the rib member, Oh in core constituted by bonding by an oblique rib member which is inclined in one direction extends in the circumferential direction between left and right pair of rib members, and the radial direction
The connecting position of the diagonal rib member and the outer ring
Is arranged outside the vehicle when the vehicle is mounted .

By thus connecting the inner ring and the outer ring constituting the core with the pair of left and right rib members extending in the circumferential direction at both ends in the width direction, the contact pressure distribution of the core is made uniform and the tire is It is possible to reduce damage to the inner surface. In addition, a diagonal rib member that is inclined with respect to the radial direction is arranged between the pair of left and right rib members, and a truss-shaped beam structure is formed by this diagonal rib member, so that excessive deformation of the core due to load is prevented. It is possible to improve the durability. Moreover, when these rib members and diagonal rib members are provided, since there is no difference in the rigidity of the core in the circumferential direction, the riding comfort in the punctured state can be improved. In the present invention, the diagonal rib member is radially
On the other hand, it is assumed that it is tilted in one direction to suppress the weight increase of the core.
Even if it is installed, the core should be
So that the connection position with the ring is outside the vehicle when the vehicle is installed
By attaching to the wheel, these rib members and diagonal ribs
The load shared by the members is made uniform and when running in a punctured state
The durability of can be improved.

The structure of the present invention will be described below in detail with reference to the accompanying drawings. 1 shows a meridian section of a safety wheel according to an embodiment of the present invention, FIG. 2 shows a side surface of a core, and FIG. 3 shows an outer peripheral surface of the core. In the figure, W is a wheel and T is a pneumatic tire. The wheel W is composed of a disc portion D and a rim portion R. On the other hand, in the pneumatic tire T, the carcass layer 2 is mounted between the pair of left and right bead portions 1 and 1, and two belt layers 4 and 4 are inserted on the outer peripheral side of the carcass layer 2 in the tread portion 3. . The pair of left and right bead portions 1 and 1 of the pneumatic tire T are attached to the rim ends on the left and right sides of the rim portion R, respectively.

Inside the pneumatic tire T, a ring-shaped core 5 projecting radially outward from the rim flange is mounted at a substantially central position on the outer peripheral surface of the rim portion R.
The inner ring 6 along the outer peripheral surface of the rim portion R and the outer ring 7 positioned radially outside the inner ring 6 are a pair of left and right rib members 8 extending in the circumferential direction at both widthwise end portions thereof.
8 and the pair of left and right rib portions 8 and 8 extending in the circumferential direction between the members,
In addition, they are connected by an oblique rib member 9 that is inclined with respect to the radial direction. The diagonal rib member 9 is provided on the inner ring 6
And, the opposite ends of the outer ring 7 are joined together. In addition, the above-mentioned core 5 is 4 even in the circumferential direction.
The core is divided into individual core divided bodies 5a to 5d, which are connected to each other by a connecting member 10 to form a ring shape.

As the constituent material of the core 5, polyurethane, natural rubber, polybutadiene, thermoplastic resin (nylon 4,6, nylon 6,6, polyamide, polyphenylene sulfide, polyamide imide, etc.), or nylon fiber using them as a matrix , Polyester fiber,
A mixture of single fibers such as rayon fiber, aromatic polyamide fiber and carbon fiber glass fiber can be used.

As described above, in the wheel composed of the pneumatic tire T and the wheel W, the core 5 is mounted on the outer peripheral surface of the rim R of the wheel W, so that the tire in the punctured state can be formed from the inside by the core 5. Since it can be supported, even if the tire internal pressure becomes substantially 0 kg / cm ² ,
It is possible to move to a safe place where repairs can be done as it is.

In the present invention, the inner ring 6 and the outer ring 7 constituting the core 5 are provided with rib members 8 and 8 extending in the circumferential direction at both ends in the width direction, and a circumferential direction between the rib members 8 and 8. Since the rib members 8 and 8 and the diagonal rib members 9 are connected to each other by the diagonal rib members 9 extending in the radial direction and inclined with respect to the radial direction, the load is uniformly distributed over the entire contact surface of the core 5. Since the contact pressure distribution is made uniform, damage to the inner surface of the tire can be reduced. Moreover, since the diagonal rib member 9 enhances the lateral rigidity of the core 5, the core 5 is deformed in the width direction when a load is applied, and the rib members 8 are damaged due to stress concentration. Can be prevented.

Moreover, since the rib members 8, 8 and the diagonal rib member 9 extending in the circumferential direction do not cause a difference in the rigidity of the core in the circumferential direction, it does not give a rugged feeling when traveling in a flat state. It is possible to improve riding comfort. In the present invention, it is preferable to mount the core 5 on the outer peripheral surface of the rim so that the connecting position of the diagonal rib member 9 with the outer ring 7 is on the vehicle outer side when the vehicle is mounted. That is, since the vehicle leans when the tire is punctured, the core 5 receives a load in an oblique direction. Therefore, when the connecting position of the diagonal rib member 9 with the outer ring 7 is arranged outside the vehicle, the load shared by the rib members 8 and 8 and the diagonal rib member 9 in the core 5 is larger than that in the mounting in the opposite direction. Is uniformed, deformation of the core 5 is suppressed, and durability during traveling in a punctured state can be improved more effectively.

The core 5 is composed of four core divisions 5a ...
Since 5d is connected to each other by the connecting member 10 to form a ring shape, it can be mounted on a general-purpose wheel. These core split bodies 5a-5
A cutout portion for passing one of the bead portions 1 when the pneumatic tire T is assembled on the rim at least at one of the divided positions of d (between the core divided bodies 5a and 5d in the figure). 11 is provided, the division angle β with respect to the circumferential direction is set to 15 ° to 75 °, and the core spacing A is
Is preferably 10 to 50 mm. When such a notch portion 11 is provided, the wheel W on which the core 5 is mounted is attached.
On the other hand, when the pneumatic tire T is assembled on the rim, the bead portion 1 can be easily passed to the other side by applying the one bead portion 1 to the notch portion 11 and rotating the tire T. Therefore, it is possible to greatly improve the rim assembly property.

If the dividing angle β is less than 15 °, the end portion of the core divided body becomes an acute angle, and it becomes difficult to release from the mold, resulting in a decrease in productivity. It becomes difficult to let the bead portion 1 pass through the notch portion 11. If the core spacing A is less than 10 mm, it becomes difficult to pass the bead portion 1 through the cutout portion 11,
On the contrary, when it exceeds 50 mm, the rigidity in the vicinity of the cutout portion 11 is partially reduced, and the durability of the core 5 is reduced.

It is not necessary to consider the change in rigidity in the circumferential direction when the adjacent core divisions are substantially in contact with each other, but when they are separated from each other, the riding comfort and the ride comfort due to the change in rigidity can be considered. It is necessary to eliminate the decrease in durability. Therefore, when the cutout portion 11 is provided as described above, the end portion of the core divided body in that portion is formed to be 5 to 30% thicker than the other portions, and unevenness in circumferential rigidity is prevented. It is preferable to relax. In this case, if the gauge up rate at the end is less than 5%, it is not possible to reinforce the partial lack of rigidity, and conversely, if it exceeds 30%, excessive reinforcement results in uneven rigidity in the circumferential direction. become. It is preferable to select a main member that mainly supports a radial load, such as the outer ring 7 and the rib member 8, as the member that is formed thick in the core divided body, and the thickness range thereof is the end of the core divided body. 10m from the department
It is preferably m or more.

The core 5 may be fitted and fixed to the outer peripheral surface of the rim R without a gap, may be rotatably held with a slight gap, or may be adhered with an adhesive. . However, when the core 5 is fitted and fixed to the outer peripheral surface of the rim R, slippage occurs at the contact portion between the inner surface of the tire and the core 5 due to the difference between the tire peripheral length in the punctured state and the core peripheral length. Therefore, the inner surface of the tire is easily damaged. When the core 5 is simply held rotatably, the inner surface of the tire and the core 5
Although the damage to the inner surface of the tire due to friction with is eliminated,
During normal traveling, the core 5 may generate noise due to vibration.

Therefore, it is preferable that the core 5 is bonded to the outer peripheral surface of the rim R with an adhesive with a slight gap. When the core 5 is bonded to the outer peripheral surface of the rim R via the adhesive layer 12 as described above, noise is not generated during normal traveling, and the adhesive layer 12 is destroyed during traveling in a punctured state, so that the core Since 5 is in a rotatable state, damage to the inner surface of the tire can be prevented.

As the adhesive for adhering the core 5 and the rim R, a urethane primer, an acrylic adhesive,
Epoxy adhesives, phenolic adhesives (more specifically, phenol / novolac adhesives, nitrile / phenolic adhesives, phenol / formal adhesives) are suitable. In addition, it is preferable to attach a microcapsule sheet 13 containing a lubricant to a portion of the outer ring 7 of the core 5 that contacts the inner surface of the tire. By providing such a microcapsule sheet 13, the microcapsules are crushed when the inner surface of the tire and the core 5 come into contact with each other, and the lubricant leaks to the surface of the core. The coefficient of friction between the two is greatly reduced, and damage to the inner surface of the tire can be prevented even more effectively.

[0021]

EXAMPLE In the wheel structure shown in FIG. 1, the tire size was 185 / 70R13, the rim size was 14 × 5J, and only the cores mounted on the outer peripheral surface of the rim were varied as shown in Table 1 below. Comparative wheels , wheels 1 to 4 of the present invention
And reference wheels were manufactured respectively. Conventional wheels do not have a core. The comparative wheel has a T-shaped core cross section, and more specifically, as shown in FIG. 4, an inner ring along the outer peripheral surface of the rim and an outer ring located radially outside the inner ring are provided. A core joined by a rib member extending in the circumferential direction at the center portion in the width direction is rotatably mounted on the outer peripheral surface of the rim. Further, in the wheels 1 to 4 of the present invention, as shown in FIG. 5, the core is attached to the outer peripheral surface of the rim via an adhesive so that the connecting position with the outer ring of the diagonal rib member is located outside the vehicle. The reference wheel is shown in Fig. 6.
As described above, the mounting direction of the core is opposite to that of the wheels 1 to 4 of the present invention. The maximum cross-sectional width of each core is 50.
mm, and the sectional height from the rim base line was 60 mm. Polyurethane using polytetramethylene ether glycol (PTMG) and tolylene diisocyanate (TDI) as a prepolymer and methylenebisorthochloroaniline (MBOCA) as a curing agent was used as a constituent material of the core. A urethane primer was used as an adhesive for bonding the core to the outer peripheral surface of the rim.

With respect to the above-mentioned wheels, the load durability, riding comfort and rim assembly property were evaluated by the following test methods. Load durability: Tire internal pressure of test wheel is 0 kg / cm ² , load is 450 kg, speed is 81 km / hr, camber angle is 5 °
Under the conditions described above, running was performed on a drum having a diameter of 1707 mm, and the running distance until the running became impossible was measured. The evaluation result is shown by an index with the comparative wheel being 100. The larger the index value, the better the load durability. In addition, the state of the inner surface of the tire was observed after the test. The observation results are indicated by ⊚ for the liner surface which is almost not damaged only by rubbing, ○ for the liner rubber having wrinkles, and Δ for the liner rubber having cracks scattered. Burst of the carcass layer is shown by x.

Riding comfort: A test wheel was mounted on the right front wheel of a domestic small four-wheeled vehicle at a tire internal pressure of 0 kg / cm ² , and the other wheels were mounted at a tire internal pressure of 2.0 kg / cm ² .
From this state, run on uneven road surface at a speed of 50 km / hr,
A feeling test was conducted by a test driver.
The evaluation result is shown by an index with the comparative wheel being 100. The larger the index value, the better the riding comfort.

Rim assembling property: For each test wheel, the time required for assembling the tire to the wheel equipped with the core was measured. The evaluation result was shown by an index with the comparison wheel being 100, by calculating the reciprocal of the required time. The larger the index value, the better the rim assembly property.

[0025]

[Table 1] As is apparent from Table 1, the wheels 1 to 4 of the present invention can run even in a punctured state, unlike the conventional wheels to which the core is not mounted, and the core cross section is T-shaped. It had better load comfort than wheels and improved riding comfort.

Further, in the comparative wheel, since the bead portion of the tire cannot pass over the core, the core is assembled by putting a hand through the gap between the tire and the rim after the rim is assembled. In Nos. 1 to 4, the bead portion was passed through the notch of the core from the state where the core was attached to the wheel, so that the rim assembly property was extremely excellent.

[0027]

As described above, according to the present invention, the inner ring extending along the outer peripheral surface of the rim and the outer ring located radially outside of the inner ring extend in the circumferential direction at both ends in the width direction. Since a core constituted by connecting a pair of left and right rib members and an oblique rib member extending in the circumferential direction between the pair of left and right rib members and inclined with respect to the radial direction is mounted on the wheel, these rib members are attached. And the presence of the diagonal rib member can make the contact pressure distribution of the core uniform and reduce the damage to the inner surface of the tire. Also, since the truss-shaped beam structure is formed by the diagonal rib member, the core is excessively loaded by the load. It becomes possible to prevent deformation and improve its durability. Moreover, since the rib members and the diagonal rib members extending in the circumferential direction do not cause a difference in rigidity in the circumferential direction in the core, it is possible to improve riding comfort in a punctured state. Furthermore, in the present invention, the diagonal rib member is radially
The core is slanted in one direction, and the core is a diagonal rib.
The connecting position of the member and the outer ring is outside the vehicle when the vehicle is installed
As it is attached to the wheel so that the weight of the core increases
It is possible to improve durability while suppressing.

[Brief description of drawings]

FIG. 1 is a sectional view showing a safety wheel according to an embodiment of the present invention.

FIG. 2 is a side view showing a core according to an embodiment of the present invention.

3 is a plan view showing a main part of an outer peripheral surface of the core of FIG. 2 as seen from an arrow B. FIG.

FIG. 4 is a cross-sectional view showing a core having a T-shaped cross section used for a comparative wheel.

FIG. 5 is a sectional view showing a core used in wheels 1 to 3 and 5 of the present invention.

FIG. 6 is a cross-sectional view showing a core used for a reference wheel .

[Explanation of symbols]

5 core 6 inner ring 7 Outer ring 8 rib members 9 Oblique rib members W wheel R rim T pneumatic tire

Claims (6)

(57) [Claims] 1. In a wheel in which a pneumatic tire is mounted on a wheel, an inner ring extending along a rim outer peripheral surface of the wheel and an outer ring located radially outside the inner ring are surrounded by both widthwise end portions thereof. A pair of left and right rib members extending in the direction, and extending in the circumferential direction between the pair of left and right rib members,
The core constituted by bonding by an oblique rib member which is inclined in one direction relative to and radially, and the oblique rib member
The position where the outer ring is connected to the outside of the vehicle when the vehicle is mounted
Safety wheels mounted on the wheel so as to be. 2. Tire tires are provided at least at one location of the core.
A cutout portion is provided for passing the cord portion.
Safety wheels described in. 3. The dividing angle of the cutout portion with respect to the circumferential direction.
The degree β is set to 15 to 75 °, and the core spacing A is set to 10 to 50.
The safety wheel according to claim 2, wherein the safety wheel has a size of mm. 4. A pair of left and right rib members extending in the circumferential direction at both ends in the width direction of an inner ring along the rim outer peripheral surface of the wheel and an outer ring located radially outside the inner ring, and the left and right rib members. A core formed by combining a pair of rib members with a diagonal rib member extending in the circumferential direction and inclined in one direction with respect to the radial direction , the diagonal rib portion
The connecting position between the outer ring and the outer ring is
A core that was placed on the side . 5. A tire bead portion is passed through at least one place.
The inside of Claim 1 provided with the notch part for making it pass.
Child. 6. A dividing angle of the cutout portion with respect to a circumferential direction.
The degree β is set to 15 to 75 °, and the core spacing A is set to 10 to 50.
The core according to claim 5, which has a size of mm.