JPS64322Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a holding member for a core for a safety tire that is fitted onto the outer peripheral surface of a wheel rim and supports the tire outer skin when the internal pressure decreases, and more specifically, a holding member for a core for a safety tire that is fitted onto the outer peripheral surface of a wheel rim and supports the outer skin of the tire when the internal pressure decreases. The present invention relates to a holding member that is made of a substantially U-shaped rubber elastic body that is engaged with and holds the core at a constant distance from the outer peripheral surface of a wheel rim and the beat portion of a tire, and in which a cord reinforcing material is embedded.

In order to prevent the danger of a sudden drop in internal pressure when the tire is running, we have proposed a safety tire with a structure in which an annular tire core is attached to the outer circumferential surface of the wheel rim to support the outer skin of the tire in the internal cavity of the tire. has been done. Conventionally, as shown in FIG. 1, the tire core a of such a safety tire is fitted so that its inner peripheral edge b and the outer peripheral edge d of the wheel rim c are in contact with each other, and when the internal pressure of the tire decreases, It is formed as an annular body with an outer peripheral edge f supporting the tire outer skin e, and the tire core a is integrally fixed to the wheel rim c or is attached to the wheel rim C.
It is attached to the wheel rim c so that it can slide on it.

At this time, the latter is preferable in terms of the labor and manufacturing cost required for attachment to the rim c, but the latter has the drawback of generating vibration and noise during normal running.

The present invention solves these drawbacks, and is capable of reliably fixing the tire core to the wheel rim during normal driving, and in the event of a drop in internal pressure due to a puncture, etc.
An object of the present invention is to provide a holding member which can prevent the tire from falling off by fixing the bead part of the tire to the rim flange, and can also provide a tire core with a shock-reducing function. An embodiment of the tire core holding member of the present invention will be described in detail below with reference to the drawings.

FIG. 2 shows the holding member 4 of the tire core 1 of the present invention.
is shown assembled into a tire 2. In the figure, the holding member 4 is engaged with the end portions of wing portions 6, 6 that extend laterally to both sides at the lower end portion of the tire core 1, and is interposed between the wing portion 6 and the wheel rim 5. The wing portion 6 is attached to the outer circumferential surface 5 of the wheel rim 5.
a bottom piece 4a that can be held at a distance from the bottom piece 4a; and a rising piece that stands up at the outer end of the bottom piece 4a and can maintain a gap between the side edge of the wing portion 6 and the tire bead portion of the tire 2 attached to the wheel rim. b, and an upper piece 4c extending inward from the upper end of the upright piece 4b along the upper surface of the wing section 6, and has a U-shaped cross section formed by the bottom piece 4a, the upright piece 4b, and the upper piece 4c. It has a groove and is made of a rubber elastic body.

By fitting the wing portion 6 into the groove, a gap is formed between the wing portions 6 of the tire core 1 and the outer peripheral surface 5a of the wheel rim 5, and between the wing portions 6 and the tire bead portion 7.
Since the holding member 4 made of a rubber elastic body is interposed between the tire bead portion 7 and the tire core 1, the tire bead portion 7 and the tire core 1 are fixed to the wheel rim 5 by the pressing force acting between them via the holding member 4. be done. Therefore, even if the internal pressure decreases due to a puncture or the like, the tire bead portion 7 is fixed and the tire 2 does not fall off, ensuring safety, and the impact transmitted from the ground contact surface to the tire core 1 is maintained as described above. It can be relaxed by the rubber elasticity of the member 4, and in the case of the tire core 1 which is constructed by dividing the holding member 4 into a plurality of parts in the circumferential direction and combining them by attaching the tire core 1, each division can be relaxed. It also has the function of joining pieces together.

In this embodiment, in order to prevent the holding member 4 from growing and bulging in the radial direction, the holding member 4 has an upper side, that is, a portion close to the upper side of the wing portion 6 of the tire core 1, in the circumferential direction. An extending cord reinforcing material 8 is embedded. The cord reinforcing material 8 can be made of organic fiber cords or inorganic fiber cords, preferably a bundle of a large number of steel wires, which is substantially the same as that used for the so-called bead wire 9.

As described above, the tire core holding member of the present invention can reliably fix the tire core to the wheel rim while the tire is running or when the internal pressure decreases due to a puncture, and can also reduce impact. The holding member 4 of the present invention can preferably be formed as a single piece that is continuous in the circumferential direction, or can be formed as a combination of circular arc pieces divided in the circumferential direction if necessary.

As shown in FIG. 3, the holding member 4 of the present invention has a protrusion 6a on the upper end of the wing portion 6 of the tire core in order to further strengthen the engagement with the tire core 1.
It is preferable to provide a structure capable of engaging with the protrusion 6a, and in this case, the shape of the engagement surface of the holding member 4 is changed in accordance with the shape of the protrusion 6a. Furthermore, the holding member 4 of the present invention can be modified in various ways, such as by forming a gap 9 in the portion on the tire bead 7 side as shown in FIG. 4, thereby making it easier to assemble the rim of the tire 2.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional safety tire, Fig. 2 is a schematic perspective view showing one embodiment of the present invention incorporated into the tire, and Figs. 3 and 4 show other embodiments of the present invention. FIG. DESCRIPTION OF SYMBOLS 1... Tire core, 2... Tire, 2a... Tire outer skin, 4... Holding member, 4a... Bottom piece, 4b... Standing piece, 4c... Top piece, 5... Wheel rim, 5a... Outer peripheral surface, 6... Wing part, 7... Tire bead portion, 8... Cord reinforcement material.

Claims (1)

[Scope of utility model registration request] A holding member for a tire core for a safety tire, which is fitted and attached to the outer circumferential surface of a wheel rim and supports the tire outer skin when the internal pressure decreases, and has a wing section extending from both sides at the lower end, the wing section and the wheel rim. a bottom piece interposed between the bottom piece and capable of holding the wing part at a distance from the outer peripheral surface of the wheel rim; and a tire bead of the tire that rises from the outer end of the bottom piece and attaches to the side edge of the wing part and the wheel rim. It is made of a rubber elastic body having a U-shaped cross section and having a raised piece that can maintain a gap between the raised piece and an upper piece that extends inward from the upper end of the raised piece along the upper surface of the wing part. A tire core holding member characterized in that a cord reinforcing material extending in the circumferential direction is embedded in the upper piece.