JPS58199205A - Assembly of bicycle tyre and rim and its manufacturing method - Google Patents

Abstract

PURPOSE:To ease and lighten assembling work by positioning a hollow and round tyre in a recessed part of the outer periphery of a synthetic resinous rim and fixing an annular rib of the tyre, through filling form, in a deeper annular groove formed in the recessed part so as to unite the two in one body. CONSTITUTION:Configuration of a tyre 1 is such that a tread part 3 is formed on the grounding side outer peripheral face of a hollow and round tyre main body 2 made of elastic body such as rubber and the like, and an annular rib 5 with bead wires 4, 4 buried in its both side end parts is formed on the inner peripheral face, further short fiber 6 is buried in the tyre main body 2 and the annular rib 5. On the other hand, a rim 9 formed through integrating an arm part 7 and a boss part 8 from synthetic resin is made by providing a bead wire supporting member 13 with many blocks 12 juxtaposed close to both ends of the annular groove 10 at the bottom of the recessed outer peripheral face of the rim 9. Then, the tyre 1 and the rim 9 are assembled through burying the annular rib 5, in a condition that its bead wires 4 are supported on the supporting member 13, into the annular groove 10 so as to fill it up.

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 rotational molding and a method for manufacturing the same.

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

This solid tire is relatively easy to manufacture, but there is no air inside the tire, no fiber reinforcement such as sudare weave is built into the tire, and the purpose is to strengthen the fit with the rim. Due to the lack of bead wires, the performance is inferior in many aspects compared to conventional airmatic tires, and there are still issues that need to be resolved.

In other words, in Niematic bicycle tires, the rim and tire are firmly fitted together due to the air pressure sealed inside and bead wires buried in the ears of the tire. This effectively resists 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 Niematic tires have been changed to the selection of different elastic bodies inside and outside of the non-foamed elastic bodies that make up the tire in solid tires, the shape and thickness of the inner and outer surfaces, that is, the surface layer and the core, Although some attempts have been made in tire design, such as the physical properties of elastic bodies, it is extremely difficult to control the design, and in addition, there are problems with heat generation that occur frequently during continuous driving. The current situation is that they are unable to actively utilize the advantages they possess.

This invention actively incorporates the advantages and advantages inherent in two-knee matic tires and cross-over tires, and provides an innovative bicycle tire and rim assembly in which the tire and rim are integrally manufactured using VC. A method for manufacturing the same is provided, and specific embodiments of the present invention will be described below with reference to the drawings.

The tire (1) 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 rib (5) with bead wires [4] [4) embedded in both side edges of the inner peripheral surface of the main body (2), respectively. The tire body (2) and the annular rib (5) are formed integrally with short fibers (6) such as natural or synthetic fibers, inorganic fibers, metal fibers, etc. with non-directionality or with a certain directionality in the tridal direction. It is buried while maintaining the In addition, especially when imparting a certain directionality to the short fibers, the directionality can be made different between the front side and the inner side of the tire body, thereby increasing the toughness of the tire body.

(9) is made of synthetic resin, such as nylon, with the arm (7) and boss (8) parts embedded with reinforcing glass fibers as needed. With M fat rim,
At the bottom of the concave outer circumferential surface of the rim, there is an annular groove α that is one step deeper.
1 is formed, and a large number of blocks U) extending in the annular direction are arranged in parallel on both ends of the annular groove α1 of the bracket, leaving an appropriate gap a1) between each block. A3 is raised and b. The support member a3 shown in FIG. 3 has two rows of blocks a, and instead of the configuration in which the bead wire is supported by the blocks and the rim side wall as shown in FIG. It is supported by

The structure of the round tire (1) and rim (9) is as follows: The annular rib (5) of the round tire is connected to the annular groove 00 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 +41 (41 is the support member az
The annular rib (5) of the tire is supported on the aδ, and in the gap 00 of each block α2 constituting the bracket support member a■.
A part of the elastic body constituting the tire is bitten into a comb-teeth shape, and the annular rib (5) part of the tire is bitten into the outer body of the tire's annular rib by the peed wire layer (4) and the supporting member. The support member bites into the tire, making the round tire and rim even more strongly integrated.

The valve aΦ is set through the rim (9) of the assembly and the annular rib (5) of the round tire, and communicates with the hollow part of the tire body, and the valve aΦ 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 Q□ which is one step deeper is formed at the bottom of the concave outer circumferential surface, and two bead wires are supported by leaving an appropriate gap aυ between each block 02 extending in an annular direction towards both ends of this annular groove 00. The rim (9) made of synthetic resin, for example, nylon resin, in which the arm (7) part and boss (8) part, which are reinforced with glass fiber or the like as required, are integrally formed by injection molding or injection molding. It is pre-molded using compression molding or other means in a state where the valve α-yu is equipped. One bead wire (4) is pre-wound on each of the two annular support members 030J protruding in the annular groove 01 of this rim (9). ) for round tire mold α
The mold for molding a round tire formed by the rim (9) and the mold (2) is used as a part of the mold that covers and is in charge of the inner peripheral part of ω, and is incorporated as a part of the mold for molding a round tire. It is set in a shaft rotation 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 tabya is formed by applying 111 rotations in the vertical direction of the mold.

In the next step, a liquid non-foaming elastic material mixed with short fibers such as natural or synthetic fibers, inorganic fibers, and metal fibers for reinforcement is injected into the mold, the mold is given biaxial rotation, and the tire body is The annular rib (5) part of the tire is simultaneously molded using the elastic material filled in the annular groove OQ of the rim (9) and the annular groove OQ of the rim (9), and the tire tread part (3), which was formed in the previous process, has a three-part structure. The materials are molded in one piece. On this occasion,
In particular, when it is desired to orient the short fibers (6) mixed in the liquid elastic material in a certain direction (tridal direction), this can be achieved by appropriately selecting the angle of the rotation axis of the two-shaft rotary molding machine. During molding, liquid elastic material is injected in a two-step method, that is, slightly more than 1/2 of the main body molding material is injected, and in this case, the angle formed by one axis of the molding machine is The surface side part of the tire body is left in a semi-hardened state by tilting it at a predetermined angle with respect to the axis, and then the remaining amount of elastic material is injected, and the angle of the other shaft is tilted at a predetermined angle in the direction opposite to the rotation axis. Rotational molding is performed at an angle of inclination, thereby forming a round tire with a tire body portion in which short fibers that maintain traveling properties in different directions are mixed in the elastic bodies on the front and inner sides that form the tire body. At the same time, this tire is firmly attached to the rim, that is, a part of the elastic body constituting the annular rib (5) of the tire is attached to the entire circumference of the tire in the gap (11) of each block constituting the bead wire support member of the rim. Because of the comb-teeth-like bite and the presence of the bead wire, the tire is fitted with the rim, and the bonding force becomes even stronger.

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 NBR, etc. , liquid CR, liquid BR1 liquid EP
Examples of such materials include DM, liquid EPM, and liquid IR.Also, various natural or synthetic fibers, inorganic fibers, metal fibers, etc., which are mixed into this liquid elastic material as reinforcing materials, can be used as materials.
Examples of Ia fibers include glass fibers, titanium oxide fibers, carbon fibers, alumina fibers, nylon fibers,
Polyester fibers, aromatic polyacid fibers, etc. are used, and the diameter of the fibers used is substantially 0.001-1.
．． 0. A length of approximately 0.1 to 5.0 mm is recommended.

When a liquid polyurethane elastomer is used as the elastomer material, glass fibers, which are inorganic fibers, are suitable as the mixed fibers due to their viscosity.

The assembly of the round tire and rim, which is firmly molded as one body with the rim (9), is removed from the mold, and the valve 0 is inserted through the rim of the assembly and the annular rib of the round tire.
4) Adhesive sealant (commonly known as puncture prevention agent) if necessary
is injected to form a sealing layer on the inner wall surface of the tire hollow part.

Since this invention is an assembly consisting of a round tire and a rim that are bonded and fixed together, there is no risk of the tire coming off the rim unlike with conventional solid tires where the entire tire is made of an elastic material, and the shape of the tire does not change. Without paying undue special consideration to material selection based on material properties, it basically maintains the advantages of pneumatic tires, contributes to improved productivity, and is versatile in practical use. It can enjoy the advantages of solid tires and two-knee matic tires.

That is, (1) The assembly of the present invention does not require any assembly work between the rim and the tire during use, and can be made into a device that is significantly lighter in terms of weight.

(2) In the case of metal rims, the spoke heads for load support are exposed in the fitting grooves of the rim, which could damage the tire tube, but in this invention, resin rims are used. As a result, this concern is completely eliminated.

(3) Since expensive materials such as sudare woven cloth 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 raised in the groove of the rim and supported by the support member, 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 between the blocks constituting the bead wire support member, in other words, the block bites into the annular rib, and the bead wire Coupled with the presence of the rim, it is expected that the bonding force at the fitting part between the tire and the rim will become even stronger and there will be no wrinkling, among other effects.

[Brief explanation of drawings]

FIG. 1 is a partial vertical sectional view of a tire and rim assembly embodying the present invention, 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, f4041 is the bead wire, (5) is the annular rib, (6) is the short fiber, (9) is the synthetic resin rim,
01 is an annular groove, (11) is a gap, mackerel is a block, (13
) is a bead wire support member, hammered (151 indicates a mold 0 Patent applicant: Mitsuboshi Belting Co., Ltd. Voluntary procedure amendment July 1980 drawing date 1 'JG matter 17) k shown Tokucho 1982-
82180 No. 2 nJH-411 name Assembly design of rotating heavy duty tire and rim ÷ Physical data and manufacturing method 8 (Name'r'tl: l (606)
Mitsuboshi Belting Co., Ltd. 51 + li positive 6D order day i'' Showa year month day 6 ^1j number of inventions increases due to positive

Claims (4)

[Claims] (1) A hollow round tire consisting of a tire body with a tread part on the M circumference, an annular rib with beat wires embedded in both sides of the inner circumference, and short fibers mixed inside. The bead wire of the tire is supported on a pair of support members extending in an annular direction near both ends of the annular groove of a synthetic resin rim having a concave outer peripheral surface and a deeper annular groove formed in the concave portion. An assembly of a bicycle tire and a rim, in which the annular rib of the tire is filled into the annular groove of the rim to integrally bond and secure the rim and the tire. (2) The beat wire support member has a structure in which a large number of blocks are arranged in an annular shape with an appropriate gap between them, and a part of the elastic body constituting the annular rib of the tire is placed in this gap. An assembly of a bicycle tire and a rim according to claim 1, which is in a comb-teeth-like state. (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 rim with a bead wire wrapped around it is used as a part of the inner part of a mold for forming a round tire, and the mold is set in a two-axis rotary molding machine, and a liquid elastic material is poured into the mold. First, the tread of the tire is added, and then a liquid elastic material mixed with short fibers is added, and the tire body, which has a raised annular rib filled in the annular groove of the rim on the side opposite to the tread, is made into a rim. A method of manufacturing an assembly of a bicycle tire and rim formed integrally. (4) The bead wire support member has a form in which a number of blocks are arranged in a raised manner with appropriate gaps maintained between them;
In the bicycle tire and rim assembly according to claim 3, a part of the elastic material constituting a part of the annular rib of the tire is inserted into the gap in a comb-teeth shape. Production method.