JPS5914503A - Assembled body of tyre and rim for bicycle and manufacturing method thereof - Google Patents

Abstract

PURPOSE:To permit to have the merits of solid tyre and pneumatic tyre and improve the productivity of the assembled body by a method wherein the assembled body of tyre and rim is manufactured by a rotary forming method employing the rim of synthetic resin, manufactured beforehand, as a part of a mold. CONSTITUTION:The rim 9 of synthetic resin, formed integrally with an arm 7 and a boss 8, is molded beforehand by injection forming under a condition equipped with a valve 14. The rim 9 is utilized as a member of the inner peripheral part of a mold 15 while the mold 15 is set to a bi-axial rotary forming machine. Next, liquidous non-expandable elastic material is injected into the speed of cavity and a tread 3 is formed by vertical direction rotation, thereafter, the material is injected into the mold to form an annular rim 5 simultaneously by the bi-axial rotation. Subsequently, heated air is sealed into the tyre through the valve 14 and the after-curing of the tyre is finished, whereby the rim 9 bites into the whole periphery of the tyre like a comb. The assembled body is removed from the mold 15, thereafter, an agent for preventing the puncture of the tyre is poured into the tyre through the valve 14 to form the sealing property of the inside wall surface of the tyre.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bicycle tire and rim assembly and a method for manufacturing the same. The present invention relates to a bicycle tire and rim assembly manufactured by molding using a molding method, and a manufacturing method thereof.

Examples of industrial wheels and bicycle tires include air-filled pneumatic tires and solid tires whose entire tire is composed of one or more layers of elastic material.

This solid tire is relatively simple to manufacture, but there is no air inside the tire, no fiber reinforcement such as sudare weave is built into the tire, and bead wire is used to strengthen the fit with the rim. Due to reasons such as the lack of a

In other words, with pneumatic bicycle tires, the rim and tire fit firmly together due to the air pressure sealed inside and bead wires buried in the ears of the tire, and the tire and rim are able to withstand the load that is applied to the tire and rim when riding. These elements effectively resist the frictional force generated between the tire tread and the ground, allowing the bicycle to run smoothly.

The various functions played by the bead wire and internal air pressure in a two-knee matic tire, the selection of different elastic bodies inside and outside of the non-foamed elastic body that constitutes the tire in a solid tire, the shape of the inside and outside, that is, the surface layer and the core, Although reasonable attempts have been made to design tires such as thickness, physical properties of elastic bodies, etc., it is extremely difficult to control the design, and in addition, there are problems with heat generation caused by continuous running, etc., and solid tires are still used. The current situation is that they are unable to actively utilize the advantages they have.

This invention actively incorporates the advantages and advantages inherent in two-kneematic tires and solid tires, and provides an innovative bicycle tire and rim assembly in which the tire and rim are manufactured as one unit, and a method for manufacturing the same. Specific embodiments of the present invention will be described below with reference to the drawings.

The tire (1) part according to the present invention is a hollow round tire body (2) formed with a rubber-like elastic body and having a cylindrical cross section.
) and a tread part (3) on its outer peripheral surface on the grounding side, and an annular lip (5) with bead wires (4) (4) embedded in both side edges, respectively, on the inner peripheral surface of the main body (2). It is formed in one piece.

(9) is a rim made of synthetic resin, such as polyamide resin, in which the arm (7) part and boss (8) part, in which reinforcing glass fiber etc. are embedded as necessary, are integrally molded, and the concave outer peripheral surface of the rim There is an annular groove that is one step deeper at the bottom of the
is formed, and a large number of blocks σ extending in the annular direction are arranged in parallel on both ends of this annular groove oI, leaving an appropriate gap QO between each block. is raised (Fig. 2). The support member shown in Fig. 3 (13 has two rows of blocks (52), and instead of the structure shown in Fig. 2 in which the bead wire is supported by the blocks and the rim side wall, the bead wire (4) is completely supported independently. It is supported by a member.

The round tire (1) and rim (9) having the above structure have an annular lip (5) of the round tire and an annular groove 01 of the rim (9).
The round tire (1) is firmly assembled integrally with the rim (9) by being embedded in the rim (9). At this time, a pair of bead wires (4X4) for a round tire were used as a support member as Q.
An annular rib (5) of the tire is provided in the gap 09 of each block α supported on the support member (2).
A part of the elastic body constituting the tire is bitten into a comb-like shape, and the bead wire (4) and the support member are bitten into the annular rib constituting elastic body of the tire. The support member bites into the tire, making the round tire and rim more firmly integrated.

a → is a valve set through the rim (9) of the assembly and the annular lip (5) of the round tire, communicating with the hollow part of the tire body, and the pulp 04) is injected into the inner surface of the tire body. It is also used as a supply port for an adhesive sealant (commonly known as a puncture preventive agent) that is layered on the inner wall surface of the tire body.

Incidentally, inclusion of the present adhesive sealant is not an essential requirement in this invention. Further, it is desirable that the elastic body of the tread portion (3) be made of the same material as the constituent materials of the tire body from the viewpoint of adhesiveness.

Next, a specific method of manufacturing the round tire and rim assembly detailed above will be explained.

An annular groove 00 that is one step deeper is formed at the bottom of the concave outer circumferential surface, and two peed wire support members α are formed in each block extending in an annular direction toward both ends of the annular groove 01, leaving an appropriate gap 0υ between them. The rim (9) is made of synthetic resin, such as polyamide resin, and the arm (7) and boss (8) are integrally formed by injection or compression. The valve Q4) is molded in advance by means such as molding. One peed wire (4) is pre-wound on each of the two annular support members a403 protruding in the annular groove 00 of this rim (9).
This synthetic resin rim (9) is used as a part of a mold that covers and is in charge of the inner circumference of mold 0!9 for molding a round tire, and is incorporated as a part of the mold for molding a round tire. The mold for molding a round tire formed with the mold Q19 is set in a two-axis rotary molding machine (not shown).

Next, a liquid non-foamable elastic material is injected into the cavity space of the mold, and first, only the tread portion (3) of the round tire is formed by vertically rotating the mold.

As the next step, the liquid elastic material was injected into the mold, the mold was given biaxial rotation, the liquid elastic material was initially hardened, and filled into the annular groove 00 of the tire body (2) and rim (9). The annular lip (5) of the tire is simultaneously molded from an elastic material, and the three parts of the tire tread (3) that were molded in the previous step are molded into one piece.

After that, the rim (9) is equipped with a valve (1) in advance.
Gas at 120°C to 200°C, such as heated air or other gas, is filled in from 41 parts, and the internal pressure of the mold is set to 2 to 200°C.
While maintaining the pressure at 5 kg/d, biaxial rotation is performed again to complete the late curing. In addition, when polyurethane resin is used as the liquid elastic material, since isocyanate is used as the curing agent, the gas sealed in the mold prior to the latter stage curing operation is a non-hydrous gas, such as N2.
It is suitable to use an inert gas such as gas (nitrogen gas).

In this way, the tire is firmly attached to the rim, that is, a part of the elastic material that makes up the annular lip (5) of the tire is also injected into the gap 00 of each block that makes up the peed wire support member of the rim, so that the tire is firmly attached to the rim. With the interposition of the peed wire, the tire is fitted with the rim, and the bonding force becomes even stronger. In addition, the action of the heated and pressurized gas sealed in the mold prior to the late curing process prevents the formation of air bubbles in the annular tire body (2), and makes it extremely easy to produce products with uniform wall thickness in the tire body. It can be produced in

The liquid elastic material for forming round tires used in this invention is selected from materials that are liquid at room temperature and can lose fluidity and harden when heated, such as liquid rubber, liquid polyurethane N, BR, etc. , liquid C, liquid BR, liquid E
PDM, liquid KPM.

Examples of the material include liquid IR.0 The assembly of the round tire and rim, which are firmly molded together with the rim (9), is removed from the mold, and the rim of the assembly and the annular lip of the round tire are removed. Valve Q equipped through
Adhesive sealant (commonly known as puncture prevention agent) as required from 41
is injected to form a sealing layer on the inner wall surface of the tire hollow part.

Since this invention is an assembly in which a round tire and a rim are bonded and fixed together, there is no risk of the tire coming off the rim, unlike conventional solid tires where the entire tire is made of an elastic material, and the shape of the tire It basically maintains the advantages of pneumatic tires, contributes to improved productivity, and is suitable for practical use without paying undue special consideration to material selection based on material properties. It can enjoy the advantages of solid tires and two-kneematic tires in many aspects.

That is, (1) The assembly of the present invention does not require any assembly work between the rim and the tire during use, and is significantly lighter in weight.

(2) In the case of metal rims, there was a risk that the spoke heads of the load-supporting reservoirs would be exposed in the fitting grooves of the rim and could damage the tube of the tire; however, in this invention, by using a resin rim, , this concern is completely removed.

(3) Since expensive materials such as woven fabric are not used, and the manufacturing process is simple, the product itself is inexpensive.

(4) By using a resin rim as part of the mold when molding a round tire, the rim and tire can be bonded together even more strongly and reliably.

(5) When forming the tire, the bead wire is supported by a support member raised in the groove of the rim, so the wire can be securely placed at the desired position within the round tire.
In addition, since the bead wire can remain embedded in the elastic body, it is possible to fully utilize the original effects of the bead wire, such as maintaining the shape of the tire and preventing the bead wire from separating from the tire rim.

(6) A part of the elastic body constituting the annular rib (5) of the tire bites into the gap of the protrusion constituting the bead wire support member in a comb-like shape, in other words, the protuberance fits into the annular lip. Coupled with the biting and the presence of the bead wire, the bonding force at the fitting portion between the tire and the rim can become even stronger.

The following effects are expected.

[Brief explanation of drawings]

FIG. 1 is a partial vertical sectional view of a tire and rim assembly in which the present invention is implemented, FIG. 2 is a partial perspective view of a resin rim,
FIG. 3 is a longitudinal sectional view showing another embodiment of the rim taken along line A--A in FIG. 2, and FIG. 4 is a partial longitudinal sectional view of a mold for forming a round tire. In the figure, (1) is a round tire, (2) is the tire body, (3
) is the tread part, (4) (4) is the bead wire, (5)
(9) is a synthetic resin rim, QO is an annular groove,
0υ is a gap, q is a block, a is a bead wire support member, and Qe is a mold.

Claims (4)

[Claims] (1) A hollow round tire is integrally formed with a tread part on the outer circumferential surface and an annular lip with beat wires embedded in both sides of the inner circumferential surface, and the outer circumferential surface is concave. The bead wire of the tire is supported on a pair of supporting members extending in the annular direction near both ends of the annular groove of a synthetic resin rim, which has a deeper annular groove formed therein, and the annular lip of the tire is further inserted into the annular groove of the rim. A bicycle tire and rim assembly in which the rim and tire are integrally bonded and fixed by filling the grooves. (2) The peed wire support member has a structure in which a large number of blocks are arranged in an annular shape with appropriate gaps left between them, and a part of the elastic body constituting the annular lip of the tire has a comb-like shape in this gap. The bicycle tire and rim assembly according to claim 1, which is in a state where the bicycle tire and rim are bitten into the bicycle tire. (3) A deeper annular groove is formed on the concave outer circumferential surface of the synthetic resin rim with a concave outer circumferential surface, and a bead wire support member extending in an annular direction is protruded near both ends of this groove, and the support member A part of the mold that is in charge of the inner part of a mold for forming a round tire, which has a rim with a peed wire wrapped around it, is set in a two-axis rotary molding machine, and a liquid elastic material is placed inside the mold. A method for manufacturing a bicycle tire and rim assembly, in which a tire body is integrally formed with a rim, the tire body having an annular lip filled in an annular groove of the rim integrally raised on the anti-tread side by injecting the same. (4) The bead wire support member has a configuration in which a large number of blocks are raised with appropriate gaps maintained between them,
Manufacturing a bicycle tire and rim assembly according to claim 3, wherein a part of the elastic material constituting a part of the annular lip of the tire is injected into the gap in a comb-teeth shape. Method.