JPS62143705A - Motorcycle tire - Google Patents

Abstract

PURPOSE:To control heat generation and secure controllability by composing an abrasive layer which forms a tread by a rubber compound without a reinforcement, and an inside tread reinforcing layer which contains a high expansion and contraction fabric reinforcing material between a sub-layer and both layers. CONSTITUTION:A sub-tread layer 7 which is composed of a tread rubber compound on the upper part of breakers 5 and 6 is wholly arranged in the direction of a width of a tread 1. And An inside tread reinforcing layer 9 which consists of a ply made of polyamide on the upper part of a sub-tread layer 7 is disposed between shoulder parts 8. Moreover a tread abrasive layer 10 is formed which is composed of a tread rubber compound on the outer layer of the inside tread reinforcing layer 9. According to the above-mentioned formation, heat generation within a tread compound is reduced, and surface grasping force and controllability can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to motorcycle tires, and more particularly to high performance competition motorcycle tires.

This type of tire has a tread area that curves at an acute angle when viewed from the cross section so that the motorcycle can run at an angle. The tread area is specially reinforced! −
To provide good driving maneuverability, the tread and carcass have the necessary stability, and at the same time, to provide road grip, the tread is made flexible to improve ground contact. .

Furthermore, in order to reduce heat generation in tires, conventionally, compounds with low grip properties have been used or the thickness of the tread has been reduced, but this has not actually been an effective solution.

The purpose of this invention is to reduce the heat generation within the tread compound during contact with the ground without affecting the firmness of the tread and its grip on the road surface, thereby reducing the tire's grip on the road surface. The purpose is to maintain driving maneuverability.

Structure and operation of the invention The present invention comprises a pair of annular reinforced bead regions provided at a required interval, a central tread support region that is reinforced and has a curved cross section, and a central tread support region that is reinforced and has a curved cross section. a tread region provided on the radially outer side, the tread region comprising a wear layer formed of a rubber tread compound containing no reinforcing material and worn during use of the tire; a sub-tread layer made of the rubber compound; It is an object of the present invention to provide a motorcycle tire comprising an internal tread reinforcing layer between a wear layer and a subtread layer, which is made of a highly elastic fabric reinforcing material.

As the fabric reinforcement of the inner tread reinforcement layer, it is preferable to use cords made of a material having a high degree of elasticity (for example, 8 to 16%). This stretchability of the fabric reinforcement is also essential in order to avoid that the internal tread reinforcement layer influences the stiffness of the carcass and thus also the driving maneuverability.

Since the reinforcing fabric of the internal tread reinforcing layer is not provided in the tread wear layer, the rubber compound and its tread pattern can operate under normal conditions, thus providing good road grip. You can. This is important in race tire treads where large heat generation is essential. When the tread pattern is used, by forming a wear layer with a thickness that corresponds to the depth of the tread pattern.
The fabric of the internal tread reinforcement layer can be located on the proximal side of the tread pattern.

Although a cross-woven fabric may be used as the h11 strength fabric of the internal tread reinforcing layer, it is preferably a l-ply of tire cord fabric without weft yarns. More preferably, the cords of the tire cord fabric are used to reduce movement of the base side of the wear layer of the tread that occurs when approaching and leaving the road surface, and to reduce heat generation without affecting carcass stiffness. It is preferable to arrange it at an angle between Oo and 90° with respect to the circumferential direction.

Further, the reinforcing fabric of the internal tread reinforcing layer may have one or more layers or one or more plies, and each ply may have the same cord angle or may have different cord angles.

The tire may be either a cross-ply tire or a radial tire, but in either case the tread reinforcement bundle or breaker is located adjacent to the carcass reinforcement ξ
However, it is necessary to separate the reinforcing fabric of the inner tread reinforcing bundle through the sub-tread layer.

Other features of the invention will become apparent from the following description of two embodiments shown in the drawings.

The example of Oishikikoi drawing is 375/37 without tread pattern.
00 x 18'' A cross section of a motorcycle competition tire is shown.

The tire has a tread area 1 with a convex ground-contouring surface to enable it to run at an angle, and an arc-shaped carcass that forms an air chamber together with the wheel rim (not shown). The carcass has sidewall 2 and bead part 3.
The bead portion 3 is reinforced with a ring 4. A two-ply carcass reinforcing material 5 made of rayon tire fabric is installed along the carcass, and both ends thereof are wrapped around the ring 5. The carcass reinforcement is 8 in the circumferential direction.
It is arranged at 8° to form a radial carcass.

The tread area of the tire is reinforced with a pair of fabric breakers 5 and 6 to provide the necessary structural strength. The breaker-5
, 6 uses Kevlar (trade name) cord fabric without weft threads. The cords of the fabric are arranged at 25[deg.] with respect to the circumferential direction, and the breaker cords of breaker 6 and breaker 5 intersect. In conventional conventional tires, a thick layer of tread rubber is placed on the breakers 5, 6.

However, in the tire of the present invention, the breakers 5, 6
A sub-tread layer 7 (shaded area in the drawing) made of a tread compound is provided on top of the tread. The subtread layer 7 is arranged across the entire width of the tread l and extends to the shoulder 8. A reinforcing ply 9 of an internal tread reinforcing layer consisting of one briar made of polyamide (or nylon) is arranged on top of the subtread tread layer 7.
are arranged from one shoulder 8 to the other shoulder 8. The Bly 9 fabric consists of a 100 cords/inch polyamide plain weave fabric with cotton wefts spaced 10 mm apart. The above polyamide cord consists of two threads of 140 tex polyamide,
The cord has an elongation of 8.7%. The polyamide cords are arranged at an angle of 45° to the circumferential direction.

The above sub-tread layer 7 and tread wear FJ10 are made of tread compound, and together they have a thickness of 6 mm.
The tread area has a thickness of .

As mentioned above, the inner tread reinforcement layer 9 is made of a material with high elongation, but it does not affect the stability of the tread, which determines driving maneuverability, when viewed from the entire tread area. . Nevertheless,
Briar 9 of the internal tread reinforcing layer provided in the tread
The tread compound is designed to sufficiently reduce heat generation over the entire tread area with a thickness of 6+++m, and the tread compound with high gripping properties provides the necessary tread surface area for maximum road gripping. It does not prevent fever.

Components having the same reference numerals as those in the embodiment shown in FIG. 1 have the same effects in a structure provided with the tread pattern shown in FIG. 2, which has the same reference numerals. In this structure, the internal tread reinforcing layer 9 is located exactly at the base of the trend pattern, so that the effect of the internal tread reinforcing layer can be maintained until the tread pattern is worn out.

The structure of the present invention can also be applied to a tread provided with a pattern. In that case, internal tread? By placing the 111-strength fabric ply 9 on the base side of the tread pattern, the effect of the fabric ply 9 can be maintained throughout the life of the tire tread.

Further, the inner tread reinforcement layer may be a layer of two or more fabrics, and a fabric without weft yarns may be used. Furthermore, as the material for the fabric of the inner tread reinforcement layer, a pond material may be used as long as the cord has an elongation of 8-16% and the fabric does not affect the overall tread properties. .

The above tread structure including the subtread layer, inner tread reinforcing layer and wear layer can be applied to tires other than radial rubbly tires, such as cross-ply tires, as long as the tire area described above is provided above the tire support area. I can do it.

[Brief explanation of drawings]

Figure 1 shows 375/3700X without tread pattern.
FIG. 2 is a cross-sectional view of a 130/80 x 18'' regular road motorcycle tire. 1...Tread area 2.Old...Side wall 3...Bead 5.6...
・Play calf... Subtread layer 8...
... Shoulder 9 ... Internal tread reinforcement layer
10... Wear layer patent applicant Sumitomo Rubber Industries Co., Ltd. agent Patent attorney Aoyama Hajime and two others Figure 1

Claims (7)

[Claims] (1) A pair of annular reinforced bead regions 4 provided at a required interval, a reinforced central tread support region with a curved cross section, and a radially outer portion of the tread support region. The tread region 1 consists of a wear layer 10 formed of a rubber tread compound containing no reinforcing material and worn out during use of the tire, a sub-tread layer 7 made of a rubber compound, and a sub-tread layer 7 made of a rubber compound; A motorcycle tire comprising an inner tread reinforcing layer 9 made of a highly elastic fabric reinforcing material between the tread layer and the sub-tread layer. (2) In the motorcycle tire according to claim (1), the fabric of the internal tread reinforcing layer 9 is
A motorcycle tire comprising a cord made of a highly elastic material with an elongation of 8 to 16%. (3) The motorcycle tire according to claim (2), characterized in that the cords of the reinforcing fabric of the internal tread reinforcing layer 9 are made of polyamide. (4) In the motorcycle tires according to claims (1) to (3), the thickness of the wear layer 10 forming the tread pattern is adjusted such that the fabric of the internal tread reinforcing layer 9 is located at the base of the tread pattern. A motorcycle tire characterized by being set to a required thickness. (5) A motorcycle tire according to claims (1) to (4), characterized in that the internal tread reinforcing layer 9 has a thickness of one layer of fabric. (6) In the motorcycle tires according to claims (1) to (5), the fabric of the internal tread reinforcing layer 9 has a cord between 0° and 90° with respect to the circumferential center line of the tire tread. A motorcycle tire characterized by being made of tire cord fabric without weft threads. (7) The motorcycle tire according to claims (1) to (6), characterized in that a radial ply carcass and a breaker member for reinforcing the tread area are provided below the sub-tread layer. cycle tires.