JPH0672103A - Pneumatic tire - Google Patents

Abstract

PURPOSE:To improve the total performance of a pneumatic tire by applying a structure for adjusting contractory performance such as controllability, riding confortableness, fuel consumption, etc., of a vehicle to the tire. CONSTITUTION:A pneumatic tire provided between a pair of beads (1, 1) with a rubber-coated) lined fiber layer as a toroid-like carcass 2, formed inside the tire T with a main air chamber 3 and provided in a crown part 4 of the carcass 2 with a belt 5 is constituted to be provided close to the carcass 2 with sub-air chambers 6 (61, 62) consisting of hollow bodies formed out of the rubber coated fiber layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire capable of adjusting contradictory performances such as steering stability, riding comfort and fuel consumption of a vehicle, and more particularly to a sports type pneumatic tire.

[0002]

2. Description of the Related Art Conventionally, there has been an idea of making the total balance of tires appropriate in consideration of matching with a vehicle. Among them, for example, from the viewpoint of steering stability of the vehicle, the output of the engine And in connection with suspension,
It is well known that how to balance tires is a problem. And steering stability, riding comfort,
Performances such as fuel consumption are contradictory, and it is generally accepted that matching with a vehicle has its limits even if the structure and conditions are simply limited.

By the way, regarding the performance of this kind of tire, it has been clarified as follows when the belt tension and the carcass tension of the sidewall are increased, which are important factors.

[0004]

[0005]

On the other hand, since the conventional pneumatic tire has only one air chamber, there is only a means for increasing or decreasing the tension of both the belt and the carcass by filling the inner pressure.
In addition, the cavity resonance in the tire decreases when the internal pressure of the air chamber is reduced, but cornering power decreases, rolling resistance also increases, and fuel consumption also decreases, which affects other performance. In this respect, the performance of the pneumatic tire could not be sufficiently adjusted, which was a problem. An object of the present invention is to improve the total performance of a pneumatic tire by applying to the tire a structure for adjusting contradictory performances such as steering stability, riding comfort and fuel economy of the vehicle.

[0006]

In order to achieve the above object, in the pneumatic tire of the present invention, a fibrous rubberized layer is provided as a toroidal carcass between a pair of beads to form a main air chamber inside the tire. In a pneumatic tire having a belt at the crown portion of the carcass, an auxiliary air chamber made of a hollow body formed by a fiber rubberized layer is provided close to the carcass. .

[0007]

If the pneumatic tire configured as described above is driven to rotate, and in that case, the sub air chambers are present in the tread portion and the sidewall portion and the internal pressures can be changed independently, each performance Changes as compared to the conventional pneumatic tire as shown below.

[0008]

The performance mainly required in a tire such as a sports type is to reduce steering stability and rolling resistance, which requires increasing the internal pressure of the auxiliary air chamber of the tread portion and the auxiliary portion of the sidewall portion. By increasing the internal pressure of the air chamber when the air chamber is inside the carcass and lowering it when the air chamber is outside the carcass, the steering stability and rolling resistance are improved. Can be planned. (This point can be dealt with by increasing the internal pressure of the air chamber in the conventional pneumatic tire, but it is not sufficient in relation to other performance.)

Further, the performance mainly required for pneumatic tires in urban driving improves good road vibration characteristics,
To reduce the rolling resistance, increase the internal pressure of the auxiliary air chamber of the tread part, and lower the internal pressure of the sidewall auxiliary air chamber when it is inside the carcass. When the chamber is outside the carcass, the internal pressure may be increased, and in that case, the tread has a large influence on the rolling resistance, so that the above two characteristics can be improved.

Further, when traveling on a bad road, the inner pressure of the sub air chamber of the tread portion is lowered as shown in the above table, and the inner pressure of the sub air chamber of the sidewall portion is increased when the sub air chamber is outside the carcass. On the contrary, when the sub air chamber is inside the carcass, the ride comfort can be improved by lowering it. If the tension of the carcass decreases depending on the position of the sub air chamber, the internal pressure may be adjusted.

[0012]

EXAMPLES Examples will be described below with reference to the drawings. In FIG. 1, a pneumatic tire T has a toroidal carcass 2 arranged by winding a fiber rubberized layer composed of a layer in which fiber cords are arranged between a pair of beads 1 to the outside in the axial direction of the bead 1, and mainly between them. An air chamber 3 is formed.
In the crown portion 4 of the carcass 2, a two-layer belt 5 and a tread 6 are arranged substantially parallel to the curved surface of the carcass 2. Between the carcass 2 and the belt 5, the sub air chamber 6 (6 ₁ )
Is provided. Similarly additional air chamber 6 to the outside of the carcass 2 in the sidewall portion 7 (6 ₂₎ is Katachi設. It is natural that an air filling valve is attached to the main air chamber 3, but the auxiliary air chambers 6 (6 ₁ , 6 ₂ ) have the structure shown in FIG.
Internal pressure adjusting valve 9 via tube 8 as in (a)
Has been attached. The tubes 8 in the sub air chamber 6 ₂ in this figure, although the inner pressure adjustment valve 9 is provided, it is understood that is also provided in the additional air chamber 6 _1.

The sub air chamber 6 (6 ₁ , 6 ₂ ) is shown in FIG.
As in (b) or (d), it is formed in the shape of a small diameter rubberized braided hose. FIG. 3C shows the auxiliary air chamber 6
The cross section of (6 ₁ , 6 ₂ ) is shown. The sub air chambers 6 (6 ₁ , 6 ₂ ) are formed by sticking a hose-shaped one in which reinforcing fibers are coated with rubber at the time of tire molding. In this case, the sub air chambers 6 (6 ₁ , 6 ₂ ) are not limited to such ones, and may have any shape as long as they have the same effect. A sensor is provided to adjust the internal pressure of the sub air chamber 6 (6 ₁ , 6 ₂ ), the internal pressure of the chamber 6 (6 ₁ , 6 ₂ ) is measured, and the internal pressure according to the running condition at each time is maintained. It is even better if the air pressure is adjusted so that Further, the sub air chamber 6 (6 ₁ , 6 ₂ ) may be any one as long as the internal pressure between the sub air chambers 6 ₁ , 6 ₂ can be adjusted even if the sub air chambers 6 ₁ , 6 ₂ are in communication with each other. Of course.

FIG. 2 shows the auxiliary air chamber 6 (6 ₁ , 6 in FIG. 1).
₂ ) is provided inside the carcass 2 and is functionally the same as that shown in FIG. In addition, C shows an equatorial plane and R shows a rim.

[0015]

Since the present invention is configured as described in detail above, in a pneumatic tire, an auxiliary air chamber made of a hollow body formed by a fiber rubberized layer is provided outside the main air chamber in the vicinity of the carcass. The steering stability of the vehicle,
It is possible to improve the total performance of the pneumatic tire by optimizing the performance in which the ride comfort and fuel consumption are in a trade-off relationship by adjusting the internal pressure of the auxiliary air chamber. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a pneumatic tire according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a pneumatic tire according to another embodiment of the present invention.

3 (a) is a diagram showing a structure related to the sub air chamber and the internal pressure adjusting valve in the embodiment of FIG. 1. FIG. FIG. 2B is a side view of the auxiliary air chamber structure in the embodiment of FIG. 1. (C)
FIG. 7B is a cross-sectional view taken along the line AA of the auxiliary air chamber of FIG. Figure 1 (d)
FIG. 13 is a side view of a modified example of the sub air chamber structure in the embodiment of FIG.

[Explanation of symbols]

 1 Bead 2 Carcass 3 Main Air Chamber 4 Crown 5 Belt 6 Secondary Air Chamber 7 Sidewall 8 Tube 9 Inner Pressure Adjustment Valve T Pneumatic Tire R Rim

Claims (1)

[Claims] 1. A pneumatic tire provided with a fiber rubberized layer as a toroidal carcass between a pair of beads to form a main air chamber inside the tire, and a fiber rubberized layer in a pneumatic tire having a belt at the crown portion of the carcass. A pneumatic tire comprising a sub air chamber formed of a hollow body formed in the vicinity of the carcass.