Method for improving frictional force and abrasion resistance of tire

Abstract

To provide a tire that is improved in frictional force (grip force) and abrasion resistance.SOLUTION: A tread pattern (designs of a groove and an incision of a tread part of a tire) on which a number of V-shaped protrusion portions are arrayed is formed on a surface of a tire (a surface that contacts a road surface) and height difference between the arrayed V-shaped protrusion portions and a planar portion other than the portions is increased. This enables the arrayed V-shaped protrusion protrusions (convex portions) having small areas on the surface of the tire (the surface that contacts the road surface) to have functions of driving and braking a vehicle, and enables the planar portion (a concave portion) other than the protrusion portions having large areas to have a function of eliminating causes for friction force reduction (water, sand and the other). A carbon fiber-system material such as a carbon nano-tube is used as a reinforcing material for rubber that is a raw material, so that strength can be considerably enhanced.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to the application of friction and wear engineering. [Background technology]

[0002] Friction engineering

[0003] wear engineering Summary of the Invention [Problem to be solved by the invention]

[0004] We provide tires that are based on a different concept to conventional tires for passenger cars, etc., and contribute to improving friction (grip) and wear resistance. [Means for solving the problem]

[0005] (1) Friction force (grip force) performance improvement method Conventional tires were designed so that the large, flat parts (convex parts) of the tire surface (the surface that comes into contact with the road) were responsible for driving and braking the vehicle, while the narrow grooves and cuts (concave parts) were responsible for expelling factors that reduce friction between the tire and the road (such as water and sand). In response to this, by creating a tread pattern (the design of the grooves and cuts in the tire tread) in which a large number of V-shaped protrusions are arranged on the tire surface (the surface that comes into contact with the road), the V-shaped protrusions (convex parts), which have a narrow area on the tire surface (the surface that comes into contact with the road), are given the function of driving and braking the vehicle, while the flat parts (concave parts) other than the protrusions, which have a large area, are given the function of expelling factors that reduce friction (water, sand, etc.). Furthermore, compared to previous tread patterns that have numerous grooves and cuts in the tire surface, a tread pattern that arranges numerous protrusions allows for a greater difference in height between the convex areas (where the tire comes into contact with the road) and the concave areas (the bottom of the tire). This allows factors that reduce friction (such as water and sand) to be expelled from spaces on the tire surface that have a larger area and elevation difference (space with a larger volume), improving the tire's friction (grip) performance. In addition, the numerous V-shaped protrusions arranged on the tire surface are mechanically resistant to collapse or distortion, regardless of the direction from which force is applied (high shape retention). Therefore, even if the tire surface area is small (even if the area ratio is small), stability is high and the vehicle's driving, braking, and other functions are not impaired. (2) Abrasion durability improvement method Conventional tires contain carbon black and silica as reinforcing agents for the rubber, which is the main raw material. In response to this, carbon fiber materials such as carbon nanotubes are processed into powder form and then mixed. This significantly improves the strength of the tire and makes it more resistant to wear, peeling, and damage. By using methods (1) and (2), the friction (grip) performance and wear resistance performance of tires for vehicles such as passenger cars and construction machinery are improved, thereby solving the problems.

Claims

1. In environments where there is water or oil on the floor or road surface, even work shoes can be slippery. Shoes slip because the protruding parts (convex surfaces) of the soles (the surface that comes into contact with the ground) become unstable and can collapse or warp under the weight of walking, and because the difference in height between the convex and concave surfaces is small, there is little ability to expel water or oil that gets in between the soles and the floor when the soles touch the ground. In contrast, there are work shoes that are very slip-resistant and have high friction (grip) even in environments where there is water or oil on the floor or road surface. The sole of this work shoe (the surface that comes into contact with the ground) has a structure (shape) in which a large number of V-shaped protrusions (convex surfaces) are arranged on a flat surface (concave surface). This V-shaped protrusion is mechanically resistant to collapse or distortion even if force is applied from any direction (high shape retention function) (similar to the principle of triangular truss structures used in buildings). Therefore, the work shoes are very slip-resistant. The sole structure of this work shoe (its anti-slip principle) is applied to the tread pattern of the tire surface (the surface that comes into contact with the road) of passenger cars and other means of transportation. Tires slip when friction (grip) is reduced by water, sand, frozen roads, etc. This is because the tire cannot expel the debris that has gotten between the road surface and the tire (hydroplaning). Conventional tires were designed to use tread patterns (grooves and cuts on the tire surface) to expel factors (such as water and sand) that reduce friction (grip) between the tire and the road surface, thereby preventing the tire from slipping (maintaining grip). This is a method of making tires less slippery and improving friction (grip) by using a tread pattern based on the idea that, rather than "grooves and notches (recesses) with a small area ratio (narrow area) on the tire surface expel factors that reduce friction (water, sand, etc.), and flat portions (convex portions) other than the grooves and notches with a large area ratio (wide area) support the vehicle," it is based on the idea that "V-shaped protrusions (convex portions) arranged in a small area ratio (narrow area) on the tire surface support the vehicle, and flat portions (convex portions) other than the V-shaped protrusions with a large area ratio (wide area) expel factors that reduce friction (water, sand, etc.)." Conventional tire surfaces supported the vehicle using the flat areas (convex areas) other than the grooves, which had a large surface area, and expelled factors that reduce friction (such as water and sand) using the grooved areas (concave areas), which had a smaller surface area, resulting in a low expulsion capacity. In contrast, the vehicle is supported by the V-shaped protrusions (convex portions) which have a small surface area, and factors that reduce friction (such as water and sand) are expelled by the flat portions other than the protrusions which have a large surface area, resulting in greater expulsion capacity and greater frictional force (grip). In addition, the difference in elevation between the arranged V-shaped protrusion portion and the other flat portion can be designed to be greater than the difference in elevation between the groove portion and the other flat portion of the tire surface of a conventional tire, thereby increasing the ability to discharge factors that reduce friction (such as water and sand). The V-shaped protrusions (convex portions) that support the vehicle occupy a small area on the tire surface (area is narrow), but because the V-shape has high structural strength, performance such as driving, braking, and stability is not reduced. This type of tire surface structure (tread pattern) is a method of making tires for passenger cars and other vehicles less slippery and improving friction (grip). (The dimensions, number, direction, position, etc. of the V-shaped protrusions are not limited.)

2. The main raw material of tires for passenger cars and other transportation vehicles is rubber, but carbon black, silica, and other reinforcing materials are also added. Instead of carbon black or silica, carbon fiber materials such as carbon nanotubes are processed into powder form and mixed into this reinforcing material. This increases the strength of the rubber and improves its durability against wear. A method of improving durability against abrasion, peeling, and breakage by using a stronger carbon fiber material instead of the carbon black and silica that were previously used as reinforcing materials.

3. A tire for a passenger car, a two-wheeled vehicle, an aircraft or other transportation means, a construction machine, etc., which is manufactured using the method according to claim 1 or 2.

4. A service or business using the tire according to claim 3.