JPH04197803A - Tube for pneumatic tire - Google Patents

Abstract

PURPOSE:To enhance workability in installing a pneumatic tire tube and reduce the rate of failure of the tire due to a flap and enhance the ability of a vehicle to convey by providing a reinforcing layer in an area inside the tube which area is extended from one bead toe of the pneumatic tire and brought into contact with the other bead toe via a rim. CONSTITUTION:A tire assembly 12 includes a pneumatic tire 14 and a pneumatic tire tube 10 provided within the pneumatic tire 14 to retain air pressure. A tube main body 11 has a donut-shaped overall configuration when filled with air. In this case, a reinforcing layer 18 of width L is provided on a donut-shaped inner peripheral portion 11A. The reinforcing layer 18 is extended from one bead toe 15 and brought into contact with the other bead toe 17 via a rim 16 while the layer 18 is mounted on the pneumatic tire 14; i.e., the reinforcing layer 18 equivalent to conventional flaps is integrated with the tube main body 11. The trouble of inserting a flap into the pneumatic tire 14 is thus saved and also the rate of failure of the pneumatic tire tube 10 due to a flap is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tube for a pneumatic tire that is provided in a pneumatic tire and has an internal pressure retaining function.

(Prior Art) Conventionally, when a pneumatic tire with a tube provided inside the tire is assembled to a rim, a pneumatic tire tube 50 is assembled into a pneumatic tire 52 as shown in FIG. , then a flap 5 for protecting the tube 50
4 was assembled into the tire 52, and the flap 54 was assembled to the rim 56 with sufficient care so that it would not fall off or shift around the circumference of the rim 56. In the second case, the work was complicated and the workability of the installation was not good.

Furthermore, it is necessary to select the flap 54 with the optimum width (M in Fig. 6) depending on the combination of the tube 50 and rim 56 used, and if the flap 54 of the appropriate size is not used, Conversely, the flap 54 may cause the tube 50 to malfunction.

In addition, tires for trunks and buses (TBRIO00R2
The weight of the flap used in the 2000 (equivalent to 0) is approximately 2.8 kg, and when this is mounted on a 10-wheel truck, the weight of the flap will be approximately 31 kg, including one spare tire. Second, there was a problem in that the rolling resistance of the vehicle increased, fuel consumption worsened, and the vehicle's carrying capacity decreased.

C Problems to be solved by the invention: The present invention takes the above facts into account, and provides an air conditioner that can improve the installation workability, reduce failures caused by the flap, and improve the carrying capacity of the vehicle. The purpose is to obtain tubes for tires.

[Means for solving the problem; The invention described in claim (1) provides reinforcement in the inner region of the tube that contacts the other bead toe from one bead toe of the pneumatic tire through the rim when the pneumatic tire is assembled with the rim. It is characterized by having layers.

Further, the invention according to claim (2) is characterized in that the reinforcing layer is made of fiber or rubber.

[Effect]

In the present invention, since the reinforcing layer corresponding to the conventional flap is integrated with the tube, the effort of inserting the flap into the pneumatic tire is saved, and there is no need to pay attention to the tilt of the flap when installing it. , it is possible to greatly improve the ease of assembly into pneumatic tires and rims. In addition, since there is no mistake in flap selection or deviation,
Failure of pneumatic tire tubes due to flaps can be reduced.

Additionally, conventional flaps, such as TBR1000R20
The weight of the flap was approximately 2.8 kg/piece. On the other hand, the thread diameter is 0.53 mm and the number of strokes is approximately 7.
A coating rubber of 0.6 mm in total (0.6 + n + n on one side and 0 mm on the other side, or 0.3 mm on one side and 0.3 mm on the other side) is attached to both sides of a 0/50 a++n polyester cord. In the pneumatic tire tube 10 provided with a reinforcing layer, the weight of the reinforcing layer 18, which corresponds to a conventional flap, is approximately 1.1 kg.
Compared to conventional flaps, each flap costs 1. 7kg, 1
0 wheel truck weighs 18.7kg including spare tire.
A weight reduction of approximately 60% can be achieved.

〔Example〕

A first embodiment of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 2 shows a pneumatic tire tube 10 according to this embodiment.
1 shows a tire assembly 12 to which this is applied. This tire assembly 12 includes a pneumatic tire 14 and a pneumatic tire tube 10 that is provided inside the pneumatic tire 14 and maintains the air pressure.

As shown in FIG. 1, a pneumatic tire tube 10
The axial cross-sectional shape of the tube body 11 constituting the tube body 11 in an air-filled state is approximately circular.

Further, the overall shape of the tube body 11 in an air-filled state is a donut shape, and a wide reinforcing layer 18 is provided on the donut-shaped inner periphery 811A.

As shown in FIG. 2, when the reinforcing layer 18 is attached to the pneumatic tire 14, it passes from one bead toe 15 of the pneumatic tire 14 through the rim 16 to the other bead toe 17.
(distance L between bead tow 15 and bead tow 17).

As shown in FIG. 3, the reinforcing layer 18 may be formed by crossing organic fibers 20 such as nylon, polyacetanobearamide, rayon, etc. to form a canvas fabric, or as shown in FIG. It can also be used as a blind cloth such as that used in tire plies. A total of 6 beads of 0° (0.6 mm on one side and an O embryo on the other side) are placed on both sides of the organic fibers 20 arranged in this way (for example, a polyester cord with a thread diameter of 0.53 + nm and a number of threads of about 70/50 mm). 0.3 mm on one side and 0.3 mm on the other side.) Coat with a rubber that has excellent heat aging properties and is used for conventional flaps, etc., and then use the coated sheet made by this coating as It is set in a vulcanized tube body 11 and integrally vulcanized to produce a pneumatic tire tube 10. Alternatively, the coating sheet and the tube body 11 are vulcanized separately, and then the coating sheet as the reinforcing layer 18 is adhered to the tube body 11 to manufacture the tire tube 10.

However, the organic fiber 20 used in the case of integral vulcanization is
Rayon, aramid, or polyacetal, which has a low heat shrinkage rate, is preferred.

In addition, when the organic fibers 20 are made of canvas cloth, as shown in FIG. 3, the angle θ1 formed by each organic fiber 20 with the equatorial plane 22 is set to θ1− in order to obtain the most effective rigidity as a composite material. 20° to 70°, preferably θ1-30
The angle should be between 60° and 60°.

Further, when the organic fibers 20 are used as blinds, as shown in FIG. 4, the angle θ2 formed by each organic fiber 20 with the equatorial plane 22 is preferably 0°≦θ2≦70°. this is,
This is to prevent problems such as the so-called creep phenomenon, which occurs when the valve is stretched in the circumferential direction due to heat.

Furthermore, in order to make the blow-through of the pulp roller 24A of the valve 24 shown in FIGS. 1 and 2 more complete, it is preferable to provide two or more reinforcing layers 18 near the pulp roller 24A.

Next, the operation of this embodiment will be explained.

When the pneumatic tire tube 10 of this embodiment is used, since the reinforcing layer 18 corresponding to the conventional flap is integrated with the tube body 11, the pneumatic tire 14
In addition to saving the effort of inserting the flap into the pneumatic tire 14 and the rim 16 of the pneumatic tire tube 10, there is no need to pay attention to the flap's orientation during installation.
It is possible to greatly improve the ease of assembly. Also,
Since there is no flap selection error or deviation, failures of pneumatic tire tubes due to flaps can be reduced.

Furthermore, the conventional flap 54 shown in FIG. 6, for example, the flap 54 for TBR1000R20, weighs about 2.8 kg/piece. On the other hand, the thread diameter is 0.
In the pneumatic tire tube 10, which has a reinforcing layer 18 with a total of 0.6 mm of coating rubber on both sides of a polyester cord of 53 mm and about 70 strands and 150 threads, the reinforcing layer 18 corresponding to a conventional flap is provided. The weight is approximately 1.1 kg, which is 1.7 kg per flap compared to conventional flaps, and for a 10-wheel truck, it weighs 18.7 kg including the spare tire, which is approximately 60% lighter.

Note that in the above embodiment, the reinforcing layer 18 includes organic fibers 2.
0 was used, but instead of this, a rubber sheet having a thickness of 1/2 or more of the thickness of a conventional flap may be used as the reinforcing layer 18 and attached to the tube body 11. In this case, it is preferable to vulcanize the rubber sheet as the reinforcing layer 18 and the tube body 11 separately, and then bond them together. this is,
When the rubber sheet in contact with the rim is integrally vulcanized with the tube body 11, when a crank occurs in the rubber sheet, the crank progresses to the tube body 11, and the tube body 11
This is because the rubber sheet and tube body 11
By separately vulcanizing the rubber sheet and tube body 11, when a crank occurs in the rubber sheet, the growth of the crank stops at the adhesive surface between the rubber sheet and the tube body 11, and the cracks can be prevented from progressing to the tube body 11. I can do it.

(Experiment example) The pneumatic tire tube 10 of the present invention (tube size: 10.0OR20, rim 700TX20) was
Pneumatic tire tubes of Experimental Example 1, Experimental Example 2, and Experimental Example 3 manufactured according to the specifications in Table 1, pneumatic tire tubes of Comparative Example 1 manufactured according to the specifications in Table 1, and conventional examples with the specifications in Table 1. A tire assembly equipped with pneumatic tire tubes No. 1 was heated to an internal air pressure of 8 kg/cffl and a load of 3.0.
00 kg, the vehicle traveled for 7500 Qkm at a speed of 60 km/h, and after traveling, it was confirmed that there was a failure in the tube, and the results are shown in Table 1.

It became clear that each of the tubes for pneumatic tires No. 3 was superior.

〔Effect of the invention〕

Since the present invention has the above-described configuration, it has the excellent effects of improving workability during installation, reducing failures due to the flap, and improving the transportation capacity of the vehicle.

[Brief explanation of the drawing]

FIG. 1 is an axial sectional view showing a pneumatic tire tube according to an embodiment of the present invention, and FIG. 2 is an axial sectional view showing a tire assembly to which the pneumatic tire tube according to an embodiment of the present invention is applied. 3 is an explanatory diagram showing a campus roll, FIG. 4 is an explanatory diagram showing a blind roll, and FIG. 5 is an axial cross-section showing a tire assembly to which a conventional pneumatic tire tube is applied. FIG. 6 is a perspective view showing a flap applied to a conventional pneumatic tire tube. DESCRIPTION OF SYMBOLS 10... Pneumatic tire tube, 12... Tire assembly, 14... Pneumatic tire, 16... Rim, 17... Bead tow, 18... Reinforcement layer. Fig. 1 IO... Pneumatic tire tube 18... Reinforcement layer Fig. 2 12 Tire assembly 14-? Expert Tire] 6-RiJ. 17 ・ Beet toe Figure 3 Figure 4 Figure 5 Figure 6

Claims (2)

[Claims] (1) When assembled with a pneumatic tire and rim,
A tube for a pneumatic tire, characterized in that a reinforcing layer is provided in an inner region of the tube that contacts from one bead toe of the pneumatic tire to the other bead toe of the pneumatic tire through the rim. (2) The pneumatic tire tube according to claim (1), wherein the reinforcing layer is made of fiber or rubber.