JPH066005U - Motorcycle tires - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the occurrence of block baldness or block corner cuts that occur when traveling on rough terrain with a motorcycle or other motorcycle. A tread 1 extending along the cross-sectional contour of the carcass is provided at the crown portion of the toroidal carcass, and the tread 1 extends substantially circumferentially on both sides of the equatorial plane C of the tire and extends substantially axially. It is divided by a groove, and a large number of blocks 2 are formed in that portion. The substantially flat, which is chamfered over the tip from the block 2 on the side wall 2 ₁ and its side walls 2 ₁ intersects the side wall 2 ₂ corners third block 2 formed by the equatorial plane C side of the block 2 base A surface 4 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 TECHNICAL FIELD The present invention relates to a motorcycle tire that contributes to improving the durability and durability of grip of a block of a tire for motocross, enduro, etc., which generally has a small pattern land portion ratio and is for use on rough terrain.

[0002]

[Prior art]

 Conventionally, tires are generally used mainly for the purpose of use, but the area, shape, groove depth, etc. of each block in the tread are generally set, but normally each block of the tread is rectangular in shape. The current situation is that the edge of the block is stuck on the road surface to secure the glick level.

[0003]

[Problems to be solved by the device]

 However, in the existing block shape, the corner edge on the input side from the road surface is mainly worn, and the inside corner (side facing the equatorial plane) of the block is easily scratched, and the corner of that part is removed. There is a problem that it becomes rounded, the edge effect deteriorates, the grip force on the road surface also decreases and it becomes easy to slip, cornering becomes difficult, and the root of the block cracks and the block is bald. .

The present invention was devised to solve the problem, and occurs when traveling on rough terrain by a motorcycle such as a motorcycle, for example, a block of a motocross tire or a block corner. The purpose is to prevent the occurrence of cuts.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the tire for a motorcycle of the present invention is provided with a tread extending along the cross-sectional contour of the carcass at the crown portion of the toroidal carcass, and the tread is substantially circumferential on both sides of the equatorial plane of the tire. In a tire having a large number of blocks divided by a groove extending in a direction and a groove extending in a substantially axial direction, a corner portion of the block formed by a side wall on the equatorial plane side of the block and a side wall where the side wall intersects the block. There is provided a substantially flat surface by chamfering from the root to the tip of the.

[0006]

[Action]

 When a motorcycle tire configured as described above is run on a road surface, the driving force mainly applied to the tire from the road surface is the driving force, the braking force is applied along the tire equatorial plane, and the lateral direction when cornering. Two inputs (from the equatorial plane to the shoulder) are considered, and the input direction and the size of the input differ depending on the position where the block is arranged, but both are located in the center direction of the tire block. Since the edge handles the input, the edge of this part, especially the corners, will be greatly damaged and the block will be damaged.Therefore, a chamfering process is performed from this point to the base of the block to form a flat surface. The structure does not cause cracks at the roots of the blocks on that side, which is very effective in preventing block burnout. .

[0007]

【Example】

1 is a partial cross-sectional view of a tread pattern according to an embodiment of the present invention, and FIG. 2 is a perspective view of a modified embodiment of FIG. 3 (a) and 3 (b) are perspective views of a basic pattern and a chamfered portion of a MCS110 / 90-90 size tire for motocross carried out by applying the tread pattern of the present invention. The tire of the present invention has a tread pattern as shown in FIGS. 1 and 2, and has a tread 1 extending along the cross-sectional contour of the carcass in the crown portion of the toroidal carcass. The tread 1 has blocks 2 on both sides of the equatorial plane C of the tire, each block being divided by a groove extending substantially in the circumferential direction and a groove extending substantially in the axial direction. The substantially implemented chamfered over the tip corner portion 3 of the block 2 formed by the side wall 2 ₂ the side wall 2 ₁ of the equatorial plane C side of the block 2 whose side walls 2 ₁ intersects block 2 from the base A flat surface 4 is formed. It goes without saying that this chamfer may be rounded and have R. In the conventional example, the corners are not chamfered.

[0008] Next, the MCS110 / 90-19 size tires for motocross to which the embodiment and the conventional example having the above-mentioned configurations are applied are attached to a domestic 250cc motocross vehicle, and this class is usually used by an international A-class rider. The actual vehicle endurance test was carried out for each heat of 30 minutes, which is a general running pattern of the tire. The results are shown below.

[0009]

[Table 1] As a result, in the present invention, compared to the conventional example, the grip level at the time of cornering is slightly lowered at the beginning of heat, but the crack is not affected even after several heats, and the crack slightly expands after 8 heats. It was found that it was durable and did not show a drop in grip.

[0010]

[Effect of device]

 Since the present invention is configured as described in detail above, it is possible not only to increase the durability of the tire block in rough terrain running, as compared with the conventional motorcycle tire having an original pattern, but also This has the effect of preventing the occurrence of cracks in the blocks, and thus the occurrence of block burr.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a tread pattern according to an embodiment of the present invention.

FIG. 2 is a perspective view of a modified example of the tread pattern of FIG.

FIG. 3 (a) is a view showing a basic pattern of a motocross MCS110 / 90-90 size tire to which the tread pattern of the present invention is applied. (B) is a perspective view of the chamfered portion of the block in (a).

[Explanation of symbols]

1 tread 2 block 2 ₁ side wall of block 2 2 ₂ side wall of block 2 3 corner of block 2 4 almost flat surface chamfered at corner 3 of block 2 C equatorial plane

Claims (1)

[Scope of utility model registration request] 1. A toroidal carcass is provided with a tread extending along a cross-sectional contour of the carcass on a crown portion thereof, the tread including a groove extending substantially circumferentially and a groove extending substantially axially on both sides of an equatorial plane of a tire. In a tire having a large number of divided blocks, a corner portion of the block formed by side walls on both sides of the equator of the block and side walls where the side walls intersect has a substantially flat surface by chamfering from a root to a tip of the block. A motorcycle tire characterized by the following.