JPS589004B2 - Wheel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety wheel that can always strongly hold the bead portion of a tubeless tire in a fixed position on the rim.

In tubeless tire wheels, movement of the bead from its normal position can cause air leakage within the tire, and if the air pressure drops extremely due to a puncture or other reason, the bead can easily separate from the rim when the vehicle turns. If it were to come off, it would cause inconveniences such as skidding due to the rim touching the ground and a reduction in braking effectiveness.

Therefore, especially for such wheels, it is strongly desired that the bead portion of the tire is always reliably held in a fixed position on the rim regardless of the presence or absence of air in the tire.

Conventionally, in order to satisfy the above requirements, an endless bead stopper is installed inside the tire, and the bead portion of the tire is held between the endless bead stopper and the rim to prevent the bead portion from moving in the axial direction. A tire bead holding means is known that prevents the bead part of the tire from coming off the rim. It is necessary to install the bead stopper inside the tire, and with the conventional bead stopper, it is troublesome to install it in the specified position inside the tire, and the ease of installation is poor.If the bead stopper cannot be installed in the specified position, the tire holding function of the bead stopper Not only does this decrease, but the rotating mass becomes unbalanced, causing vibrations and causing problems such as poor riding comfort.

Therefore, the present invention provides a safe tubeless tire wheel that can be easily and accurately installed in a predetermined position within a tire without impairing its function as a bead stopper, and that solves the above-mentioned problems. The purpose is to provide

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.
FIG. 1 shows a safety wheel according to the first embodiment, and the wheel is composed of a tubeless tire (hereinafter simply referred to as tire) T, a split rim R, and a bead stopper BS.

Below, these configurations will be explained in order.

First, the tire T has a conventionally known structure and is formed symmetrically, with sidewall portions 2, 2 extending integrally on the left and right sides of a tread portion 1, and furthermore, these sidewall portions 2, It is constructed by integrally extending bead portions 3, 3 whose thickness is gradually increased from 2, and a bead wire 4 is embedded in each of the bead portions 3, 3.

Next, the structure of the split rim R will be explained. This split rim R connects the outboard rim 5 and the inboard rim 6 so as to be separable in the wheel axis direction, and the outboard rim 5 and the inboard rim 6
. The inboard rim 6 is constructed by integrally extending a flange 10, and the inboard rim 6 has a wide rim base 11.
A rim flange 12 for holding the bead portion 3 of the tire T is integrally extended to the outer end of a rim main body having cooperate to form a flat cylindrical support surface of the split rim R that supports the inner circumferential surface of a bead stopper BS, which will be described later.

Further, an O-ring 13 is interposed between the joint surfaces of the out and inboard rims 5 and 6 on the outside of the connecting bolt 7.

Next, the bead stopper Bs is composed of a plurality of stopper units u, u, etc. arranged in a ring, and each stopper unit U is a rectangular plate curved to fit the outer peripheral curved surface of the rim bases 9, 11. The peripheral edge of the member 24 is attached to a vertical edge piece 25.
．． 25 and lateral edge pieces 26, 26, and further surrounded by plate member 24, longitudinal edge pieces 25.25 and lateral edge pieces 26, 2.
6 is reinforced with lattice-like rib pieces 27 to have sufficient rigidity, especially lateral rigidity in the wheel axis direction, and a pair of ears are provided at one longitudinal end of the main body 28. Pieces 29, 29 are provided parallel to each other with an interval between them, and a pair of lug pieces 30, 30 are provided at the other end.
29, projecting in parallel with an interval slightly wider than that of 29.

A hinge pin 31 parallel to the wheel axis is protruded from one pair of ears 29, 29, and a pin hole 32 into which the hinge pin 31 can be inserted is bored in the other pair of ears 30, 30. It is set up.

Then, the pair of ears 29, 29 on one side of the two stopper units u to be connected are pressed in the direction toward each other, the distance between them is narrowed, and the ears 30, 29 on the other side are pressed together.
30, and insert the hinge pins 31, 31 into the pin holes 32.
．． 32, and when the pressing force is released, one of the ear pieces 29, 29 returns to its original position by its own elastic force, and the hinge pin 31.31 fits into the pin hole 32.32, and in this manner, the plurality of ear pieces 29, 29 are An annular bead stopper BS is constructed by sequentially connecting the stopper units u, u, .

This bead stopper BS has a
It is required that each stopper unit U be made of glass, for example, to have heat resistance and rigidity to withstand the heat, compressive force, bending force, etc. received from it, and to be lightweight so as not to increase the rotational resistance of the wheel. If it is made of nylon resin containing 5% to 90% fiber (in particular, a range of 10 to 50% is practical in terms of the above characteristics and moldability), aluminum alloy material, steel material, etc., this requirement can be satisfied. be able to.

Next, a method of assembling the wheel of this embodiment will be explained.

First, the bead stopper BS is inserted into the tire T, and this will be explained with reference to FIGS. 4 to 6.

Figure 4 shows the dimensional relationship between the circumscribed circle Cb of the bead stopper BS expanded into an annular shape and the inner circumferential circle Ct of the tire T.
(Here, for convenience, the stopper unit U is represented by a straight line.) As is clear from the figure, in order to incorporate the bead stopper Bs into the tire T, it must be aligned with the inner circumferential circle Ct.
It must be deformed into a bendable shape that fits inside.

Therefore, first, as shown in Fig. 5, two or more adjacent stopper units U (three in the figure) are moved within the circumscribed circle cb to a position symmetrical to the original position, and then moved within the circumscribed circle cb. If the two opposing stopper units U are moved so as to narrow the distance between them, the other stopper units U that are in contact with the circumscribed circle cb will swing inward, thereby increasing the distance between the circumscribed circle cb.
, and finally its circumscribed circle Cb becomes smaller than the inner circumferential circle Ct of the tire T, as shown in FIG.

Geometrically considering the minimum number of stopper units U that can make the circumferential circle cb smaller than the inner circumferential circle Ct of the tire T by deforming the bead stopper Bs as described above, it is found that the stopper unit U is If all the pieces are of equal length, the number is five, and if some of them are of unequal length, the number is four.

After the bead stopper Bs deformed as described above is inserted into the center of the tire T, the pair of left and right bead portions 3,
It is sufficiently expanded outward for 3 minutes, and returns to the annular shape shown in FIG. 4.

Next, the above-mentioned outboard rim 5 and inboard rim 6
The rim bases 9, 11 of the out and inboard rims 5, 6 can be assembled by incorporating the split rims R from both sides of the tire T and connecting them with a plurality of connecting bolts 7.
The flat cylindrical bearing surface consists of the bead stopper B.
The left and right bead portions 3, 3 of the tire T are compatible with the inner peripheral surface of the tire T.
is held together by both sides of the bead stopper Bs and the rim flange 10.12 of the split rim R, and the space between the tire T and the split rim R is maintained airtight.

FIG. 7 shows a safety wheel according to a second embodiment of the present invention, which further includes a flat protector in the tire T for controlling the flattening deformation in the event of a puncture and maintaining the load supporting function of the tire in place of the air pressure. Charge Fp and insert it into bead part 3.
, 3 together with rim flange 12.12 and bead stopper B
It is sandwiched between s.

The flat protector Fp is formed into an annular shape as a whole so as to be inserted into the tire T over its entire circumference, and has a special cross-sectional shape to maintain appropriate rigidity so that it can fully fulfill its function. It is made of an elastic material such as synthetic rubber, natural rubber, or synthetic resin material in order to maintain appropriate elasticity.

Further, to explain the shape in detail, it is formed symmetrically, with a pair of annular side walls 14.15 facing each other with a gap between them, and the side walls 14.15.
and a similarly annular bridge wall portion 16 that bridges and connects portions slightly inward from the outer circumferential surface, and the overall cross-sectional shape is approximately H with an annular groove 17 in the center of the outer circumferential surface. It is formed into a letter shape.

A plurality of air holes 1 are provided in the center of the bridge wall portion 16 in the circumferential direction.
8 are bored, and the inside and outside of the flat protector Fp are communicated through these air holes 18.

An annular reinforcing strip 1 made of a non-stretchable body such as a wire is provided at the intersection of the side walls 14 and 15 and the bridge wall 16, respectively.
9 is buried, and an annular reinforcing strip 20 made of a non-stretchable material such as a wire is buried in the bottom of the bridge wall 16, sandwiching the air hole 18, and the reinforcing strips 19 and 20 are , a flat protector F formed of an elastic body
It helps to increase the stiffness of p.

Further, at the lower part of the outer surface of the side wall part 14.15 of the flat protector Fp, there is a bead part bearing surface 2 which is curved in a concave manner so that it can fit well into and come into contact with the inner surface of the bead parts 3, 3 of the tire T.
1 is formed, and a substantially flat stopper bearing surface 22 that can come into contact with the outer surface of the bead stopper Bs is formed at the lower inner surface of the side wall portion 14.15. An annular projecting piece 23 is provided on one side to guide the bead stopper Bs and to prevent it from moving outward in the circumferential direction.

Therefore, when the air chamber of the tire T is filled with air at a predetermined pressure and the wheel is in a normal inflated state, the weight of the vehicle is supported by the air pressure inside the tire T, as shown by the solid line in Figure 7. However, if the air inside the tire T is lost due to a puncture accident, the tire T will collapse and the seventh
As shown by the chain line in the figure, the tread portion 1 becomes flat and comes into contact with the upper surface of the flat protector Fp, and the weight of the vehicle is supported by the flat protector Fp instead of the air pressure in the tire T.

In particular, the flat protector Fp is formed into an H-shaped cross section by the pair of side walls 14, 15 and the bridge wall 16, which face each other with a gap between them. The side wall portions 14.15 can be reliably distributed and supported, and the side wall portions 14.15 can be prevented from falling.

Therefore, it is possible to safely drive a vehicle to the nearest repair shop.As described above, according to the present invention, a rim, a tubeless tire attached to the outer periphery of the rim, and a tubeless tire inserted into the tubeless tire are provided. and an endless bead stopper configured to cooperate with a pair of flanges provided on the rim to clamp the pair of bead portions of the tubeless tire, and to inhibit movement of the bead portions in the axial direction. In the wheel, the rim is configured by connecting an outboard rim and an inboard rim, each having the flange portions separately, in a separable manner in the wheel axis direction, and further includes the bead stopper, which is attached to the outer periphery of the central portion of the rim. A plurality of stopper units having sufficient rigidity are sequentially connected via hinge pins parallel to the wheel axis so that they can take an annular shape that can be fitted and a flexible shape that can be accommodated within the inner circumferential circle of the tire. Since they are connected so that they can swing relative to each other, when assembling the wheel, first place the center part of the tire in the free state,
After placing the bead stopper held in the bent shape, the insertion of the bead stopper into the tire is completed by simply expanding and deforming it into the annular shape. Installation of the tire onto the rim is completed just by joining.

As a result, even though the outer diameter of the bead stopper in use is larger than the inner diameter of the tire, it can be easily and quickly set in a predetermined position between a pair of bead portions in the tire while remaining in an endless state. This eliminates the troublesome and labor-intensive work of forcibly changing the bead of the tire or connecting and connecting each bead stopper unit and wrapping it around the outer periphery of the rim. The assembly work efficiency of the tire can be significantly improved because the bead stopper and the rim flange can easily and accurately hold the tire bead, which not only improves the durability of the bead, but also allows the tire bead to be held easily and easily on the rim. can be firmly held in place.

Furthermore, since the connection between each stopper unit is performed via a hinge pin parallel to the wheel axis, the rigidity of the connection part against tension is high, and together with the dog rigidity of each stopper unit, the centrifugal Elongation caused by force can be reliably suppressed, and this combined with the effect of properly holding the tire bead between the bead stopper and the rim flange as described above, allows the vehicle to maintain high speed even when making sharp turns. The bead part can be reliably prevented from moving even when the tire is running, and even when the tire is punctured, the bead part can be reliably prevented from coming off, which greatly contributes to the safe running of the vehicle.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a partial vertical sectional view of a wheel of the first embodiment, FIG. 2 is a perspective view of a bead stopper therein, and FIG. 3 is a partially exploded perspective view of the wheel. 4 to 6 are schematic diagrams showing the process of inserting the bead stopper into the tire, and FIG. 7 is a partial vertical sectional view of the wheel of the second embodiment. 3...Bead part, 10.12...Rim flange, 31...
...Hinge pin, T...Tubeless tire (tire),
R...Divided rim, Bs...Bead stopper, U...Stopper unit.

Claims (1)

[Claims] 1. A rim, a tubeless tire attached to the outer periphery of the rim, and a tubeless tire inserted into the tubeless tire that cooperates with a pair of flange portions provided on the rim to sandwich the pair of bead portions of the tubeless tire. , an endless bead stopper configured to prevent movement of the bead portion in the axial direction; The bead stopper is configured to be separably coupled, and the bead stopper can have an annular shape that can fit around the outer periphery of the central portion of the rim and a flexible shape that can fit within the inner periphery of the tire. A wheel characterized in that a plurality of stopper units having sufficient rigidity are successively connected via hinge pins parallel to the wheel axis so as to be able to swing relative to each other.