JPS6152001B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention provides a core-type safety system in which an annular core is provided inside the tire along the rim, and the axle is supported by this core when the tire is deflated. It is related to tires.

If the core of a safety tire is manufactured in one piece in advance, it will not fit properly on the tire rim. Therefore, the core of a safety tire is divided circumferentially into multiple arc-shaped curved members, and these are placed on the outer circumference of the rim. They are constructed so that they are connected to each other and integrated. In this case, as a method of connecting the curved members to each other, the conventional
A joining method using bolts as shown in FIGS. 3 to 3 has been adopted. In the method shown in FIG. 1, notches 1a and 1b are provided at both ends of a curved member 1 in a step-like manner in a plan view a, facing in opposite directions, and these notches are overlapped and fastened with bolts 2 in the axial direction of the tire. This is the way to do it. The method shown in FIG. 2 is a method in which ear-shaped mounting pieces 1c are formed at opposite ends of the curved member 1, and these mounting pieces 1c are fastened with bolts 2 in the circumferential direction of the tire.

The method shown in Fig. 3 involves providing notches 1d and 1e, which appear step-like in a side view and facing oppositely to each other, at both ends of the curved member, overlapping these notches vertically, and tightening bolts 2 in the radial direction of the tire. This is the method of conclusion.

However, with the above conventional joining method, assembly work is difficult when assembling it into the outer periphery of the rim, and the bolted joint must be strengthened using metal materials, etc., which reduces the weight of the core. There was a limit to this.

This invention was made in view of the above circumstances,
The present invention provides a safety tire with a core that is easy to assemble and does not require special strengthening measures for the joints, which will be described below.

The safety tire according to the present invention has a core composed of an inner ring on the rim side and an outer ring provided on the outside thereof, and each of the inner ring and the outer ring is a connected body of a plurality of curved pieces divided in the circumferential direction. It is formed as follows. The joints of the plurality of curved pieces are provided so that the joints on the inner ring side and the joints on the outer ring side do not overlap at two or more places at the same time, except for the part that becomes the final assembly part of the core. Further, the curved piece on the inner ring side and the curved piece on the outer ring side are connected to each other by a fitting method that allows them to freely slide in the circumferential direction but cannot be separated in the radial direction. By sequentially joining the inner ring side (inside) curved piece and the outer ring side (outer side) curved piece, the curved pieces are connected to each other and an annular core is formed. It is formed so that the sides are narrower and the inner circumferential side is wider. This part becomes the final assembly part, and a pair of wedge-shaped curved pieces consisting of a combined body of an outer ring side curved piece and an inner ring side curved piece is inserted into the above-mentioned spaced part, and the annular core is completed.

Next, embodiments of the present invention shown in the drawings will be described. FIG. 4 is a side view of the core 10 provided in the safety tire according to the present invention, and a fifth
The figure is a sectional view of a safety tire incorporating this core 10. This core 10 has an inner ring 10a that contacts the rim 3 via a ring-shaped core fixing elastic body 4.
and an outer ring 10b attached to the outside of the inner ring 10a.
Consisting of In FIG. 5, A is a tire, 5 is a side ring, 6 is a lock ring, and 7 is a seal ring. The inner ring 10a and the outer ring 10b are each formed as a connected body of a plurality of inner curved pieces 11 and outer curved pieces 12. Inner curved piece 11 and outer curved piece 12
By fitting the circumferential dovetail groove 13 provided at the center of the outer curved piece 12 into the circumferential dovetail groove 14 provided at the center of the inner curved piece 11,
They are slidably coupled in the circumferential direction and cannot be separated in the radial direction once they are fitted. Examples of such a coupling method include those shown in FIGS. 6a to 6e. Figure a is the same as the example shown in Figure 5 above, and figure b has the dovetail grooves 13 and dovetail-shaped protrusions 14 provided opposite to a. In FIG. 1C, a protruding strip 15 is provided on both sides of the outer circumference of the inner curved piece 11, and the outer curved piece 12 is fitted with a groove 1 having a T-shaped cross section.
6 is provided. In the same figure d, the outer curved piece 1
2 is provided with a protrusion 17 having a T-shaped cross section, and the inner curved piece 11 is provided with a groove 18 into which the protrusion 17 fits. In the figure e, the inner curved piece 11 is provided with a protrusion 19 having a round bar-like tip, and the outer curved piece 12 is provided with a round-bottomed groove 20 into which the protrusion 19 fits. In either example, once they are fitted, both curved pieces 11,
12 cannot be separated. The fitting method used to connect the inner curved piece 11 and the outer curved piece 12 is not limited to the one shown in the illustration, but any fitting method can be used as long as it is slidable in the circumferential direction and cannot be separated in the radial direction and the axial direction of the tire. It can be anything. Note that these curved pieces can be made of materials such as synthetic resin and metal.

The inner curved piece 11 and the outer curved piece 12 are the seventh
As shown in the figure, they can be connected to each other by fitting one curved piece from the end of the other curved piece inside the tire and sliding it in the circumferential direction.
Also, by sequentially fitting both curved pieces,
Through fitting with one curved piece, the other curved pieces can be connected to each other. The lengths of the inner curved piece 11 and the outer curved piece 12 are different as shown in FIG. The joints 16, 16, . . . of the outer ring 10b formed by the 12 rows are not located at the same position in areas other than the final assembly portion 10c. Further, even when the two curved pieces are slid together, the joints on both sides are formed so that they do not coincide at two or more places at the same time. Even if the inner and outer curved pieces are formed to such lengths that their ends coincide with each other, the curved pieces can be prevented from slipping off by shifting their positions back and forth and fitting them together.
As mentioned above, it is preferable to form the curved pieces in such a way that even if the inner and outer curved pieces are moved relative to each other, the joints of both wheels will not overlap at two places at the same time in order to prevent deviation.

When the inner curved piece 11 and the outer curved piece 12 are fitted in sequence, the last remaining portion becomes the final assembly portion 10c. In this portion, a generally trapezoidal interval portion 21 is formed in which the interval on the outer circumferential side is narrower than the interval on the inner circumferential side. In this space part 21, a pair of wedge-shaped curved pieces 22 consisting of a combination of an outer curved piece and an inner curved piece are provided.
is inserted. The pair of curved pieces 22 has an outer circumferential portion shorter than an inner circumferential portion, both end surfaces are formed on the same plane, and the pair of curved pieces 22 are formed in a shape and size that fit well into the space portion 21 as a whole. By inserting this pair of curved pieces 22 into the spacer 21, the annular core 10 is completed and all the curved pieces are firmly connected. After assembly, the inner periphery of the pair of curved pieces 22 is supported by the rim, so it will not deviate in the radial direction even if it is as it is. If the circumferentially slidable fitting method is used, the joints in this part can also be made by sliding the inner and outer curved pieces to shift their relative positions after inserting the pair of curved pieces 22. Since they no longer match, this becomes even more advantageous in terms of deviation prevention. In addition, at the final joining part, the pair of curved pieces may be connected to another curved piece by a method such as pinning or bolting, if necessary. In addition, it is possible to create a joint structure with excellent sliding properties by adding lubricant to the joint between the outer curved piece and the inner curved piece, or by forming the joint itself with a material that has self-lubricating properties. ,
Since the outer ring of the core rotates freely, friction between the tire and the core can be prevented. In this case, it is more advantageous to fix the inner ring between the tire beads, since friction between the core and the rim can be prevented.

As is clear from the above explanation, since the core of the safety tire according to the present invention is assembled by fitting the members together, there is no need for the conventional fastening work with a large number of bolts, and assembly is simplified. The work became easier. Furthermore, since the core does not have a conventional fastening section, there is no need for special reinforcement measures for this section, which is advantageous in terms of weight reduction.

[Brief explanation of the drawing]

Figures 1, 2, and 3 are explanatory diagrams of the conventional core fastening method, in which a is a plan view and b is a plan view.
is a side view. FIG. 4 is a side view showing an example of a core used in the safety tire according to the present invention, and FIG. 5 is a sectional view of a safety tire incorporating the core. FIGS. 6a to 6e are cross-sectional views of curved piece joints showing different embodiments, and FIG. 7 is an explanatory view of a method of assembling the core. 1... Curved member, 2... Bolt, 3... Rim,
10... Core, 10a... Inner ring, 10b... Outer ring, 10c... Final assembly part, 11... Inner curved piece, 12... Outer curved piece, 13... Dovetail groove, 14
...Dovetail-shaped convex stripes, 15, 16... Seams, 21...
Spacing part, 22... curved piece pair.

Claims (1)

[Scope of Claims] 1. A safety tire in which an annular core is provided inside the tire along the rim, wherein the core is composed of an inner ring on the rim side and an outer ring attached to the outside of the inner ring, These inner ring and outer ring are each formed as a connected body of a plurality of curved pieces divided in the circumferential direction, and the joints between these curved pieces are, except for the part on the circumference of the core that will be the final assembly part. The joint on the inner ring side and the joint on the outer ring side are provided so that they do not overlap at two or more places at the same time, and the curved piece on the inner ring side and the curved piece on the outer ring side are slidable in the circumferential direction, but with a radial radius. The outer ring side curved piece and the inner ring side curved piece are connected to each other by a fitting method that cannot be separated in the direction, and in the final assembly section, the outer ring side curved piece and the inner ring side curved piece A core-type safety tire characterized in that a pair of wedge-shaped curved pieces whose inner circumferential sides are widened are inserted to complete an annular core. 2 In the pair of wedge-shaped curved pieces inserted into the final assembly section, the inner ring side curved piece and the outer ring side curved piece are slidable in the circumferential direction and separated in the radial direction, as in other parts. A core-type safety tire according to claim 1, which is bonded by a non-locking bonding method. 3. The core-type safety tire according to claim 2, wherein the connecting portion between the curved pieces on the inner ring side and the outer ring side has excellent sliding properties, and the outer ring is provided so as to be freely rotatable with respect to the inner ring.