Tire shaving device and tire shaving method

Abstract

To provide a tire scraping device and a tire scraping method capable of forming, on a tread portion of a tire, a traveling surface that improves ground contact while suppressing thermal deterioration of a surface of the tire during scraping, and capable of forming, on the tire, the traveling surface that approximates a circle having a predetermined diameter.SOLUTION: A tire scraping device 1 of the present invention comprises: a blade 20 that scrapes a surface of a tire; a blade attachment portion 22 to which the blade is attached; a blade rotation drive portion 24 that rotates the blade attachment portion; a tire holding portion 12 that holds the tire; a tire rotation drive portion 14 that rotates the tire while holding it; and a positioning portion 26 that can position the blade at a predetermined distance from a central axis X2 of the tire. By scraping the surface of the tire, a traveling surface of the tire is formed at the predetermined distance from the center axis of the tire while suppressing thermal deterioration of the surface of the tire during scraping.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a tire shaving device and a tire shaving method, and more particularly to a tire shaving device and a tire shaving method for cutting the surface of a tire. [Background technology]

[0002] BACKGROUND ART Conventionally, as shown in Patent Document 1, a surface grinding device for automobile tires is known that grinds the surface of a tire while visually checking the grinding position and grinding amount in order to restore reduced grip force. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-196347 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the automobile tire surface grinding device shown in Patent Document 1, when grinding the tire surface, heat is generated by grinding, which causes the tire surface to deteriorate due to heat during grinding.

[0005] There are times when you want to use tires in situations where you want to maximize their performance, such as time trials or races on a circuit. In these time trial situations, victory or defeat can be decided by shaving off even 0.1 seconds, or even 0.01 seconds, to achieve a faster time. Therefore, extreme tire performance is required for motorsports, far exceeding the performance of tires that meet the conditions for road use, and that will maximize the potential of tires for motorsports.

[0006] On the other hand, heat cycles after circuit driving can cause thermal degradation on the tire surface, preventing the tire from achieving its intended driving performance. In response to this, the present inventors have newly discovered that even if an attempt is made to polish thermally deteriorated portions of the tire surface using an automobile tire surface polishing device such as that shown in Patent Document 1, the heat generated during polishing the tire surface creates a problem in that further deterioration due to heat occurs on the tire surface during polishing.

[0007] The present invention has been made to solve such problems, and aims to provide a tire shaving device and a tire shaving method that can form a running surface on the tire tread portion that improves ground contact while suppressing thermal deterioration of the tire surface when shaving, and can form a running surface on the tire that approximates a circle with a predetermined diameter. [Means for solving the problem]

[0008] In order to achieve the above object, according to one embodiment of the present invention, there is provided a tire scraping device for scraping the surface of a tire, comprising: a blade for scraping the surface of the tire; a blade mounting portion for mounting the blade; a blade rotation drive portion for rotating the blade mounting portion; a tire holding portion for holding the tire; a tire rotation drive portion for rotating the tire while holding the tire; and a positioning portion capable of positioning the blade at a predetermined distance from the center axis of the tire; and by scraping the surface of the tire, the running surface of the tire is formed at a predetermined distance from the center axis of the tire while suppressing thermal deterioration of the surface of the tire when scraping. According to one embodiment of the present invention configured as described above, by scraping the tire surface, it is possible to form the running surface of the tire at a predetermined distance from the center axis of the tire while suppressing thermal degradation of the tire surface during scraping. This makes it possible to form a running surface that improves contact with the tire tread while suppressing thermal degradation of the tire surface during scraping, and to form a running surface on the tire that approximates a circle with a predetermined diameter. Therefore, it is possible to form a tire running surface that makes it easier to maximize the running performance of the tire. Therefore, for example, in tires used in time attacks on circuits, it is easier to maximize the tire's inherent running performance in order to reduce times by 0.1 seconds or more.

[0009] According to one embodiment of the present invention, a cutting edge line along the cutting edge of the blade is preferably disposed on a second imaginary plane parallel to a first imaginary plane passing through the central axis of the tire. According to one embodiment of the present invention configured as described above, the cutting edge line along the cutting edge of the blade is positioned on a second imaginary plane parallel to a first imaginary plane passing through the center axis of the tire. This makes it easier to form a relatively flat surface on the tire surface along the second imaginary plane parallel to the first imaginary plane that includes the center axis of the tire by scraping off the tire surface. This makes it easier to suppress thermal degradation caused by scraping off the tire surface and to form a tire running surface that makes it easier to maximize the tire's running performance.

[0010] According to one embodiment of the present invention, a cutting edge line along the cutting edge of the blade is preferably inclined at an angle within a range of +45 degrees to −45 degrees in the tangential direction of the tire from a state parallel to the central axis of the tire. According to one embodiment of the present invention configured as described above, the cutting edge line of the blade is tilted from a state parallel to the tire's center axis at an angle within a range of +45 degrees to -45 degrees relative to the center axis in the tangential direction of the tire. This makes it easier to scrape off the tire surface and form a relatively flat surface on the tire surface that is aligned with the plane that includes the tire's center axis in the tangential direction of the tire. This makes it easier to suppress thermal degradation caused by scraping off the tire surface and to form a tire running surface that makes it easier to maximize the tire's running performance.

[0011] According to one embodiment of the present invention, preferably, the cutting edge of the blade extends in a direction parallel to the central axis of the tire. According to one embodiment of the present invention configured as described above, the cutting edge of the blade can extend parallel to the center axis of the tire and parallel to the tire surface. This makes it easier to scrape off the tire surface and form a flat surface on the tire surface in a direction parallel to the tire center axis. This makes it easier to suppress thermal degradation caused by scraping off the tire surface and to form a tire running surface that makes it easier to maximize the tire's running performance.

[0012] According to one embodiment of the present invention, the cutting edge of the blade preferably has an angle within the range of 30 to 60 degrees. According to one embodiment of the present invention configured as described above, the angle of the cutting edge is set to be within the range of 30 to 60 degrees. Therefore, it is possible to further suppress the generation of heat when scraping off a relatively thin layer of the tire surface. This makes it possible to further suppress thermal degradation caused by scraping off the tire surface.

[0013] According to one embodiment of the present invention, the rotation speed of the blade mounting portion rotated by the blade rotation drive portion is preferably within a range of 1000 rpm to 8000 rpm. According to one embodiment of the present invention configured as described above, the angle of the cutting edge is set to a predetermined angle, and the rotation speed of the blade mounting portion rotated by the blade rotation drive unit is within a range of 1,000 to 8,000 rpm. As a result, when the cutting edge enters the tire surface toward the upstream side in the tire rotation direction, the tire surface is more likely to be cut and separated from a position further upstream than the tip of the cutting edge. This further reduces the generation of heat when scraping the tire surface. This further reduces thermal degradation caused by scraping the tire surface.

[0014] According to one embodiment of the present invention, the rotation speed of the blade attachment portion rotated by the blade rotation drive portion is preferably greater than the rotation speed of the tire rotated by the tire rotation drive portion. According to one embodiment of the present invention configured as described above, the angle of the cutting edge is set to a predetermined angle, and the rotation speed of the blade mounting portion rotated by the blade rotation drive unit is set to be greater than the rotation speed of the tire rotated by the tire rotation drive unit. As a result, the cutting edge rotated by the blade rotation drive unit enters the tire surface at a speed greater than the rotation speed of the tire, so that when the cutting edge enters the tire surface, the tire surface is more likely to be cut from a position further upstream than the tip of the cutting edge. This further reduces heat generation when scraping the tire surface. This further reduces thermal degradation caused by scraping the tire surface.

[0015] According to one embodiment of the present invention, the peripheral speed of the blade attached to the blade attachment portion is preferably within a range of 150 m / min to 1300 m / min. According to one embodiment of the present invention configured as described above, the peripheral speed of the blade is within a range of 150 m / min to 1300 m / min. This makes it easier for the cutting edge to cut away the tire surface from a position further upstream than the tip of the cutting edge when the cutting edge enters the tire surface. This further reduces the generation of heat when scraping the tire surface. This further reduces thermal degradation caused by scraping the tire surface.

[0016] According to one embodiment of the present invention, preferably, the tire further comprises a liquid reservoir for storing liquid, and the liquid reservoir is arranged so that the lower part of the tire is immersed in liquid. According to one embodiment of the present invention, the tire shredding device further includes a liquid reservoir that stores liquid and is positioned so that the lower part of the tire is immersed in the liquid. This allows the tire to be cooled and easier to shred with the blade, and the components of the liquid, for example, make it easier for the blade edge to shave the tire smoothly into the desired shape.

[0017] According to one embodiment of the present invention, the tire shaving method preferably includes a blade rotation step of rotating the blade mounting portion to which a blade is attached, a tire rotation step of rotating the tire while holding the tire, a positioning step of positioning the blade at a predetermined distance from the center of the tire, and a tire shaving step of shaving the surface of the tire to form a running surface of the tire at a predetermined distance from the center axis of the tire while suppressing thermal deterioration of the surface of the tire when shaving. According to one embodiment of the present invention configured as described above, by scraping the tire surface, it is possible to form the running surface of the tire at a predetermined distance from the center axis of the tire while suppressing thermal degradation of the tire surface during scraping. This makes it possible to form a running surface that improves contact with the tire tread while suppressing thermal degradation of the tire surface during scraping, and to form a running surface on the tire that approximates a circle with a predetermined diameter. Therefore, it is possible to form a tire running surface that makes it easier to maximize the tire's running performance. Therefore, for example, in tires used in time attacks on circuits, it is easier to maximize the tire's inherent running performance in order to reduce times by 0.1 seconds or more. [Effects of the Invention]

[0018] The tire shaving device and tire shaving method of the present invention can form a running surface on the tire tread portion that improves ground contact while suppressing thermal deterioration of the tire surface when shaving, and can form a running surface on the tire that approximates a circle with a predetermined diameter. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a perspective view of the appearance of a tire shredding device according to an embodiment of the present invention. [Figure 2] 1 is a perspective view of the appearance of a tire shredding device according to an embodiment of the present invention. [Figure 3] 1 is a top view of a tire shaving device according to an embodiment of the present invention. FIG. [Figure 4] 1 is a partial side view of a tire scraping device according to an embodiment of the present invention. FIG. [Figure 5] FIG. 2 is an exploded perspective view showing the blade and blade mounting portion on one side of the tire chipping device according to one embodiment of the present invention, with the blade and blade mounting portion disassembled. [Figure 6] 1 is a cross-sectional view of a blade attachment portion and a blade of a tire chipping device according to an embodiment of the present invention. FIG. [Figure 7] 1 is a partially enlarged side view of a blade attachment portion and a blade of a tire shredding device according to an embodiment of the present invention, in a state immediately before the blade comes into contact with a tire to shred the tire. [Figure 8] 1 is a partially enlarged cross-sectional view of a portion of a tire cross section that is shaved by a tire shaving device according to an embodiment of the present invention. FIG. [Figure 9] 1A-1D illustrate steps of a tire shaving method according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tire shredding device according to an embodiment of the present invention will now be described with reference to the accompanying drawings. First, Figure 1 is an external oblique view of a tire shaving device according to one embodiment of the present invention, Figure 2 is an external oblique view of a tire shaving device according to one embodiment of the present invention, Figure 3 is a top view of a tire shaving device according to one embodiment of the present invention, Figure 4 is a partial side view of a tire shaving device according to one embodiment of the present invention, Figure 5 is an exploded oblique view showing one side of the blade and blade mounting portion, etc., with the blade mounting portion and blade of a tire shaving device according to one embodiment of the present invention disassembled, and Figure 6 is a cross-sectional view of the blade mounting portion and blade of a tire shaving device according to one embodiment of the present invention. In the following description of one embodiment of the present invention, when looking at the tire from the blade and blade mounting portion side, the front side is referred to as the front side, the tire side (rear side) is referred to as the rear side, when looking at the tire from the blade and blade mounting portion side, the right side is referred to as the right side, and similarly when looking at the tire, the left side is referred to as the left side.

[0021] As shown in Fig. 1, a tire shaving device 1 according to one embodiment of the present invention is a device that shaves the surface of a tire 2. The tire shaving device 1 shaves the surface of the tire 2 by shaving it with a blade, which will be described later. The tire shaving device 1 also functions as a motorsport tire adjusting device that adjusts tires for motorsports.

[0022] The tire 2 is a tire for driving an automobile. The tire 2 includes an outer circumferential portion 6 having a tread portion 4 and a shoulder portion 5, a wheel portion 8 that supports the outer circumferential portion 6, and a tire-side mounting portion 10 provided on the wheel portion 8. The outer circumferential portion 6 includes the tread portion 4 that mainly comes into contact with the road surface. The tread portion 4 and the shoulder portion 5 are mainly formed of rubber, for example, synthetic rubber. The tread portion 4 and the shoulder portion 5 may also be formed of synthetic resin or the like.

[0023] The tire 2 is a sports tire, for example, a so-called high-grip type radial tire. For example, the tire 2 may be a semi-racing tire, semi-slick tire, slick tire, high-grip tire, or the like, used in motorsports, such as time attack runs on circuits and race runs. The tire is a tire used in situations where an automobile is driven, such as time attack runs on circuits and race runs, by extracting performance close to the limits of the automobile's performance and the tire's running performance. Therefore, the tire 2 is intended as a type of tire for motorsports that differs from so-called comfort tires and so-called studless tires. The tire 2 has a diameter, for example, within a range of 590 mm to 720 mm. The tire 2 has a width, for example, within a range of 150 mm to 340 mm, or within a range of 220 mm to 310 mm.

[0024] The tire 2 in this embodiment is a sports tire or the like, and the present technology forms a running surface that is resistant to thermal degradation and that brings out the running performance of the sports tire, as will be described later. Therefore, the present technology is different from the technology for so-called retread tires, in which the tread rubber is scraped off to create an adhesive surface for attaching a new tread.

[0025] The tire-side mounting part 10 is fixed to the tire holding part with bolts and nuts. For example, the tire-side mounting part 10 has a structure similar to that of a tire mounting part of a vehicle, which is fixed with, for example, five bolts. As a variant, the tire-side mounting part 10 may be fixed to the tire holding part with, for example, one fixing part.

[0026] The tire scraping device 1 includes a tire holding unit 12 that holds the tire 2, a tire rotation drive unit 14 that rotates the tire 2 in a predetermined rotation direction while holding the tire 2, and a structure 16 in which the tire holding unit 12 and the tire rotation drive unit 14 are arranged.

[0027] The tire holding portion 12 forms a mounting portion for mounting a tire. The tire 2 is mounted to the tire holding portion 12 so that the central axis X1 (see FIG. 3) of the tire holding portion 12 roughly coincides with the central axis X2 of the tire 2. The tire holding portion 12 has a structure similar to that of a mounting portion for a tire 2 on a typical vehicle, and fastens the wheel portion 8 of the tire and the tire holding portion 12 with a plurality of bolts and nuts. The tire holding portion 12 may be configured to fasten the wheel portion 8 and the tire holding portion 12 using a simpler mounting member, for example, a center lock system that allows fastening at a single point with a bolt or nut using a hole in the center of the wheel.

[0028] As shown in FIG. 2, the tire rotation drive unit 14 is connected to the tire holding unit 12 via a pulley (not shown) and a belt (not shown) built into the tire rotation transmission unit 15. The tire rotation drive unit 14 is an electric motor. The tire rotation drive unit 14 transmits the rotation of the motor to the tire holding unit 12 via a pulley (not shown) and a belt (not shown) in the tire rotation transmission unit 15. As a modified example, the tire rotation drive unit 14 may be connected to the tire holding unit 12 via a gear or the like built into the tire rotation transmission unit 15. As another modified example, the tire rotation drive unit 14 may be directly connected to the tire holding unit 12 and transmit the rotation without using a belt (not shown) or the like.

[0029] The tire rotation drive unit 14 is configured to be able to set the rotation speed of the tire holding unit 12 and the tire 2 within a range of, for example, 0.5 to 5 rotations per minute. The tire rotation drive unit 14 may include a reduction gear or the like, and is configured to achieve a desired tire rotation speed. The tire rotation drive unit 14 is electrically connected to an external power source, but is configured by a battery or the like, and external wiring can be omitted. The rotation direction B of the tire 2 may be reversed. The rotation direction of the tire 2 and the rotation direction of the blade 20 may be the same.

[0030] The structure 16 mounts the components of the tire shaving apparatus 1, which will be described later. The structure 16 includes movable wheels 18 for facilitating movement of the tire shaving apparatus 1. The structure 16 is primarily formed of a metal, e.g., aluminum, frame and plate. Therefore, the tire shaving apparatus 1, without the tire 2 attached, is formed to have a weight in the range of approximately 70 kg to approximately 200 kg, e.g., approximately 100 kg. Therefore, the tire shaving apparatus 1 is formed with a weight that can be carried by approximately three average-sized adults, and also with a weight that can be pushed by an average-sized adult when placed on a concrete surface. For example, the tire shaving apparatus 1 can be manually moved at a circuit or the like to facilitate tire setting. Furthermore, for example, the tire shaving apparatus 1 is configured as a single, portable device, approximately 1 m square and weighing approximately 100 kg. Therefore, it can be relatively easily brought to a circuit, not just a factory, and tire setting can be freely adjusted on-site.

[0031] The tire scraping device 1 further includes a blade 20 that cuts the surface of the tire 2, a blade mounting portion 22 to which the blade 20 is attached, a blade rotation drive portion 24 that rotates the blade mounting portion 22, a positioning portion 26 that can position the blade 20 at a predetermined distance from the central axis X2 of the tire 2, and a control portion 60 that controls the tire rotation drive portion 14 and the blade rotation drive portion 24.

[0032] When attached to the blade attachment portion 22, the blade 20 is positioned such that, in a basic position intended to make the tread portion 4 relatively flat, the center axis X2 of the tire 2 and the cutting edge line along the cutting edge 20a of the blade 20 are located on two parallel imaginary planes (a first imaginary plane and a second imaginary plane). Here, the first imaginary plane E1 including the center axis X2 is, for example, a vertical plane including the center axis X2, and the second imaginary plane E2 including the cutting edge line along the cutting edge 20a is, for example, another vertical plane including the cutting edge 20a. The first imaginary plane E1 and the second imaginary plane E2 are each illustrated by a dashed line in FIG. 4. The second imaginary plane E2 is an oblique second imaginary plane E3, which will be described later, and the second imaginary plane E3 is a plane extending in the tangential direction of the tire 2. The cutting edge line along the cutting edge 20a may extend obliquely on the second imaginary plane E2. That is, the cutting edge 20a may be set at an angle other than a direction parallel to the central axis X2 on the second imaginary plane E2 (for example, an angle tilted by 5 degrees so that the right side of the cutting edge is positioned higher than the left side).As will be described as a modified example, the cutting edge line along the cutting edge 20a may be tilted at an angle within a range of +45 degrees to −45 degrees in the tangential direction of the tire from a state parallel to the central axis X2.

[0033] The imaginary plane may be set as an oblique imaginary plane. That is, the first imaginary plane including the central axis X2 may be an oblique first imaginary plane E4. Furthermore, the second imaginary plane including the cutting edge line along the cutting edge 20a (the cutting edge 20a at this time is located at E3, which is higher than the position of the cutting edge in FIG. 4) may be an oblique second imaginary plane E3. In FIG. 4, the oblique first imaginary plane E4 and the oblique second imaginary plane E3 are also illustrated. Such two imaginary planes, for example, the oblique first imaginary plane E4 and the oblique second imaginary plane E3, extend parallel to each other.

[0034] Furthermore, the blade 20 has a cutting edge 20a that extends parallel to the center axis X2 of the tire 2 in the basic position. The blade 20 is disposed so that the cutting edge 20a faces upstream in the rotation direction B of the tire 2 when the cutting edge 20a of the blade 20 attached to the blade attachment portion 22 comes into contact with the surface of the tire 2. The cutting edge 20a does not have to face upstream in the rotation direction B. The blade 20 is formed in a rod shape with a relatively thin thickness and extends linearly. For example, the blade 20 is formed in a blade shape similar to a razor blade. The cutting edge 20a of the blade 20 has a length L in the longitudinal direction within a range of 50 mm to 310 mm (see FIG. 5), for example, a length within a range of 80 mm to 150 mm. The blade 20 has a thickness A within a range of 1 mm to 3 mm (see FIG. 6), for example, a thickness within a range of 1.5 mm to 2.5 mm. The blade 20 is formed so that the cutting edge 20a has a cutting edge angle α1 that is, for example, within a range of 30 to 60 degrees, or within a range of 35 to 55 degrees, or within a range of 40 to 50 degrees, or within a range of 43 to 48 degrees. The blade 20 is also formed so that the rake angle α2 is, for example, within a range of 25 to 35 degrees. By inserting the cutting edge 20a into the tire at a relatively large angle relative to the tangent to the tire surface, the tire surface can be cut through and scraped while reducing friction. This reduces thermal degradation of the scraped surface. The blade 20 is replaceable and can be replaced or re-sharpened when it becomes dull.

[0035] The blade mounting portion 22 includes a main body portion 28 on which the blade 20 is placed, and a retaining portion 30 that holds the blade 20 between the main body portion 28 and the retaining portion 30. The blade 20 is held down so that it is sandwiched between the main body portion 28 and the retaining portion 30. The retaining portion 30 is attached to the main body portion 28 by a bolt 32. By tightening the bolt 32, the retaining portion 30 is fixed to the main body portion 28, and the blade 20 is fixed to the main body portion 28.

[0036] When the main body 28, blade 20, and pressing portion 30 are assembled, the blade mounting portion 22 forms an assembly with a generally cylindrical cross section and a generally circular outer periphery. The central axis X3 (see FIG. 3) of the blade mounting portion 22 is disposed parallel to the central axis X1 of the tire holding portion and the central axis X2 of the tire 2. The central axis X3 and the central axis X2 are positioned at the same height. The blade mounting portion 22 mounts the blade 20 so that it extends in a direction parallel to the central axis X3. The blade mounting portion 22 is rotatably supported between the support arms 23. The blade mounting portion 22 is rotated by the transmission of rotation of the blade rotation drive unit 24. With the blade 20 mounted, the blade mounting portion 22 is rotated so that the cutting edge 20a faces upstream in the rotation direction B of the tire 2. Note that the rotation direction C of the blade mounting portion 22 may be reversed.

[0037] The blade attachment portion 22 is formed so that, with the blade 20 attached, the blade 20 protrudes from the outer peripheral surface of the blade attachment portion 22 by a protrusion amount, for example, within a range of 0.5 mm to 2 mm, or, for example, within a range of 0.5 mm to 1.5 mm. Therefore, the tire is scraped to a depth equal to the protrusion amount from the tire surface. Because the protrusion amount is relatively small, the load and friction on the tire surface during a single cutting operation are reduced, thereby suppressing heat generation. Furthermore, by scraping the surface layer of the tire 2 to a depth of, for example, about 0.1 mm to 1 mm, or, for example, about 0.1 mm to 0.5 mm, it is possible to remove only the surface portions that are susceptible to heat. Furthermore, because the surface is scraped with a blade, a smooth surface is formed, as if it had been cut with a sharp blade. Therefore, a smoother surface is formed than a surface polished with a grinding stone such as a sander, and small surface irregularities that can cause a decrease in running time can be suppressed. Furthermore, by removing only the surface layer of the tire 2, the tread layer of the tire 2 can be left so that the surface layer of the tire 2 can be removed again after use (for example, after a time trial run on a circuit), and the surface layer of the tire 2 can be removed multiple times each time the tire is used before running. Of course, the grinding is performed with consideration given to tire safety. For example, the diameter φ of the workpiece when the blade 20 and blade mounting portion 22 are assembled is approximately 48 mm.

[0038] The blade rotation drive unit 24 is connected to the blade attachment unit 22 via a pulley (not shown) and a belt (not shown) built into the blade rotation transmission unit 25. The blade rotation drive unit 24 is an electric motor. The blade rotation drive unit 24 transmits the rotation of the motor to the blade attachment unit 22 via the pulley and the belt in the blade rotation transmission unit 25. The blade rotation drive unit 24 is configured to control the rotation speed of the blade attachment unit within a range of, for example, 100 to 20,000 rpm, or within a range of, for example, 1,000 to 10,000 rpm, or even within a range of, for example, 1,000 to 8,000 rpm. For example, the rotation speed of the blade attachment unit rotated by the blade rotation drive unit 24 may be relatively higher than the rotation speed of the tire, for example, 100 rpm or higher. Because the tread portion is relatively softer than a metal blade, even a rotation speed of 100 rpm or higher is a relatively high rotation speed due to the need to scrape the tread portion. Therefore, the rotation speed of the blade mounting portion 22 is set to, for example, a range of 100 to 20,000 rpm, a range of 1,000 to 10,000 rpm, or a range of 1,000 to 8,000 rpm. For example, the rotation speed of the blade mounting portion 22 may be relatively higher than the rotation speed of the tire, for example, 100 rpm or higher. Because the tread portion is relatively soft compared to a metal blade, even a rotation speed of 100 rpm or higher is relatively high due to the need for scraping. The blade rotation drive unit 24 is configured to achieve a desired rotation speed of the blade mounting portion 22. Alternatively, the blade rotation drive unit 24 may be connected to the blade mounting portion 22 via a gear or the like built into the blade rotation transmission unit 25. Alternatively, the blade rotation drive unit 24 may be directly connected to the blade mounting portion 22 and transmit rotation without using a belt (not shown) or the like.

[0039] The circumferential speed of the blade attached to the blade attachment portion is, for example, a value within a range of 150 m / min to 3000 m / min, or, for example, a value within a range of 150 m / min to 1300 m / min. The circumferential speed is the tangential speed of the blade when it is rotating, and indicates the speed of the cutting edge. "Circumferential speed" is calculated as follows: workpiece diameter (e.g., diameter φ of the workpiece to which the blade and blade attachment portion are attached = 48 mm) × π × workpiece rotation speed (e.g., 4000 rpm) ÷ 1000. For example, when the workpiece diameter φ is 48 mm, the circumferential speed = φ48 mm × π × 4000 rpm ÷ 1000 = 603.2 m / min. Furthermore, when the workpiece diameter φ is 48 mm, the circumferential speed = φ48 mm × π × 20000 rpm ÷ 1000 = 3014.4 m / min. Furthermore, for example, when the workpiece diameter φ is 48 mm and the workpiece rotation speed is 1000 rpm, the circumferential speed = φ48 mm × π × 1000 rpm ÷ 1000 = 150.7 m / min. Furthermore, when the workpiece diameter φ is 48 mm and the workpiece rotation speed is 8000 rpm, the circumferential speed = φ48 mm × π × 8000 rpm ÷ 1000 = 1205.7 m / min. Thus, the circumferential speed of the blade may be, for example, within a range from 150 m / min to 1300 m / min. By having the blade have such cutting edge speed, when the cutting edge 20a enters the surface of the tire 2, it becomes easier to cut into the surface of the tire 2 from a position further upstream than the tip of the cutting edge 20a, thereby suppressing the generation of heat when scraping the surface.

[0040] The positioning unit 26 includes a first adjustment mechanism 34 configured to move the blade 20 and the blade mounting portion 22 in a first direction toward the tire 2, a second adjustment mechanism 36 configured to move the blade 20 and the blade mounting portion 22 in a second direction perpendicular to the first direction, a blade angle adjustment mechanism 38 configured to adjust the inclination of the blade 20 between the first direction and the second direction, and a measuring device 40 (see Figure 3) that measures the protrusion amount of the blade 20.

[0041] The first adjustment mechanism 34 is formed to be movable in a first direction with the blade 20, the blade attachment portion 22, the blade rotation drive portion 24, etc., mounted thereon. The first direction is, for example, a direction from the radially outer side toward the center of the tire 2, as indicated by arrow D1 (see FIG. 3). The first direction is, for example, the front-rear direction. Therefore, the first adjustment mechanism 34 adjusts the positions of the blade attachment portion 22 and the blade 20 in the first direction, for example, the front-rear direction.

[0042] The first adjustment mechanism 34 includes a handle portion 42 that can be manually operated by an operator, and a first position adjustment table 44 that can be moved in a first direction with the blade 20, the blade attachment portion 22, and the blade rotation drive unit 24 placed on it. When the handle portion 42 is rotated, the screw shaft 45 of the first adjustment mechanism 34 is rotated, and the first position adjustment table 44 is moved in the front-to-rear direction. The first adjustment mechanism 34 forms a screw-type position adjustment mechanism. The first position adjustment table 44 can be moved, for example, approximately 100 mm forward and backward in the first direction. Note that the position of the first adjustment mechanism 34 in the first direction may be adjusted by an electric drive unit.

[0043] The first position adjustment table 44 is disposed above the blade angle adjustment table of the blade angle adjustment mechanism 38, and is configured to move back and forth relative to the table below the first position adjustment table 44. The first adjustment mechanism 34 is configured to adjust the position of the cutting edge 20a of the blade 20 with relatively high precision, for example, in millimeters, and even to units of 0.1 mm or less (for example, 0.01 mm).

[0044] The second adjustment mechanism 36 is formed to be movable in the second direction with the first adjustment mechanism 34 and the blade angle adjustment mechanism 38 placed on top. The second direction is a direction perpendicular to the first direction, such as a direction along the central axis X2 of the tire 2, as indicated by arrow D2 (see FIG. 3). The second direction is, for example, the left-right direction. Thus, the second adjustment mechanism 36 adjusts the positions of the blade attachment portion 22 and the blade 20 in the second direction, such as the left-right direction.

[0045] The second adjustment mechanism 36 includes a second position adjustment table 46 that is movable in the second direction with the first adjustment mechanism 34 and the blade angle adjustment mechanism 38 mounted thereon. The second position adjustment table 46 is slidably disposed on rails 47 that extend parallel to the left and right directions, and is configured to be movable on the rails by manual operation by an operator. The second position adjustment table 46 is movable, for example, by approximately 450 mm in each direction in the second direction. Note that the position of the second adjustment mechanism 36 in the second direction may be adjusted by an electric drive unit.

[0046] The second position adjustment table 46 is disposed generally horizontally on the structure 16, and is configured to move left and right relatively to the upper surface of the structure 16. Thus, the second adjustment mechanism 36 is configured to adjust the position of the cutting edge 20a of the blade 20 in the left and right directions on the horizontal plane. Thus, the blade 20 is positioned by the first adjustment mechanism 34 and the second adjustment mechanism 36.

[0047] The blade angle adjustment mechanism 38 is formed so that its own tilt in the left-right direction can be changed with the first adjustment mechanism 34 placed on top of it. Therefore, the blade angle adjustment mechanism 38 can adjust the tilt in the left-right direction of the blade attachment portion 22 of the first adjustment mechanism 34 and the blade 20.

[0048] The blade angle adjustment mechanism 38 includes a grip 48 that can be manually operated by an operator, and an angle adjustment table 50 that can rotate left and right on a horizontal plane with the first adjustment mechanism 34 placed on it. The angle adjustment table 50 of the blade angle adjustment mechanism 38 has two arc-shaped grooves 51, and protrusions 52 extending upward from the second position adjustment table 46 are inserted into these grooves 51, respectively. Therefore, the angle adjustment table 50 is formed to be rotatable within a plane above the second position adjustment table 46. The angle adjustment table 50 also includes a scale indicator 54 that indicates a scale. The scale indicator 54 indicates a scale on a scale plate provided to the side of the second position adjustment table 46 and below the scale indicator 54. The scale indicates angles ranging from -30 degrees to +30 degrees, as described below. The blade angle adjustment mechanism 38 changes the orientation of the blade 20 (the angle with respect to the tire central axis X2) when the operator rotates the blade angle adjustment mechanism 38 while gripping the grip portion 48. The blade angle adjustment mechanism 38 may be formed by an electric rotating device.

[0049] The blade angle adjustment mechanism 38 is formed so that, in a basic position where the angle is 0 degrees (the basic position where the angle is 0 degrees is shown in FIG. 3 ), a line along the cutting edge of the cutting edge 20 a of the blade 20 is parallel to the center axis X2 of the tire. The blade angle adjustment mechanism 38 positions the blade 20 so that, in the basic position where the angle is 0 degrees, the cutting edge line along the cutting edge 20 a of the blade 20 is located on a second imaginary plane E2 (a second oblique imaginary plane E3) that is parallel to a first imaginary plane E1 (a first oblique imaginary plane E4) that passes through the center axis X2 of the tire 2. The cutting edge 20 a may be set at an angle other than a direction parallel to the center axis X2 on such second imaginary plane E2 (a second oblique imaginary plane E3) (for example, an angle tilted by 5 degrees so that the left side of the cutting edge is positioned higher than the right side). Furthermore, the blade angle adjustment mechanism 38 can change the angle within a range of, for example, -40 degrees to +40 degrees, or, for example, -30 degrees to +30 degrees. When the blade angle adjustment mechanism 38 is at an angle of -30 degrees, the line along the cutting edge of the blade is tilted 30 degrees to the left with respect to the central axis X2. When the blade angle adjustment mechanism 38 is at an angle of +30 degrees, the line along the cutting edge of the blade is tilted 30 degrees to the right with respect to the central axis X2. The blade angle adjustment mechanism 38 can adjust the angle of the blade 20 relatively accurately to a level of 1 degree or less.

[0050] The blade angle adjustment mechanism 38 is disposed generally horizontally on the second position adjustment table 46, and is configured to change its angle relative to the second position adjustment table 46. Thus, the blade angle adjustment mechanism 38 is configured to adjust the angle of inclination of the cutting edge 20a of the blade 20. In other words, the second adjustment mechanism 36 can orient the blade 20 in the left-right direction with the tire 2 as the center. Furthermore, such a blade angle adjustment mechanism 38 allows the setting angle of the cutting surface of the tread portion 4 (see FIG. 8) and shoulder portion 5 (see FIG. 8) of the tire 2 to be set in relatively precise detail.

[0051] The measuring device 40 measures the amount by which the blade 20 is moved in the first direction by the first adjustment mechanism 34 (the amount by which the blade 20 protrudes toward the tire). The measuring device 40 includes a first table-side measuring unit 56 formed to rise from the first position adjustment table 44 of the first adjustment mechanism 34, and a measuring instrument 58 attached to a support extending from the angle adjustment table 50 of the blade angle adjustment mechanism 38. The first table-side measuring unit 56 is attached to the upper surface of the first position adjustment table 44 and formed to rise upward from the first position adjustment table 44. The first table-side measuring unit 56 is used as a reference unit for measuring the position of the first position adjustment table 44.

[0052] The measuring device 58 can measure the distance the first position adjustment table 44 has moved relative to the angle adjustment table 50. More specifically, the measuring device 58 can measure the distance the first table-side measuring unit 56 has moved (protruded) in the first direction from the position where the first table-side measuring unit 56 abuts against the measuring device-side measuring unit 59 of the measuring device 58. The measuring device 58 is, for example, a dial gauge. The measuring device 58 includes a measuring device-side measuring unit 59 that measures the distance according to the distance the measuring device 58 is pushed into the measuring device 58. The measuring device 58 displays the distance pushed from the position where the measuring device-side measuring unit 59 abuts against the first table-side measuring unit 56. The measuring device can measure the distance relatively accurately, even in units of 0.01 mm, for example. By using such a measuring device 40, the depth and amount of grinding can be controlled to the desired amount. Furthermore, the grinding amounts of the left and right tires 2 of the vehicle can be made the same. Furthermore, the grinding angles of the left and right tires 2 of the vehicle can be made symmetrical. Therefore, the driving performance can be appropriately set according to the left and right curves.

[0053] The positioning unit 26 can fix and position the blade 20 at a predetermined distance from the center axis X2 of the tire 2, thereby scraping the surface of the tire 2. Because tires are essentially molded rubber products, there is variation in the precision of their shape during manufacturing. However, by deliberately scraping the tire with the configuration of this embodiment, the tire 2 can be formed into a circle of roughly uniform diameter (e.g., a perfect circle) with relatively high precision. This makes the tire 2 more stable in contact with the ground during high-speed driving in motorsports, and can be effective in further reducing the time required for one lap around the circuit by, for example, 0.1 seconds.

[0054] The control unit 60 (see FIG. 1 ) controls the rotation speeds of the tire rotation drive unit 14 and the blade rotation drive unit 24 (and, via these rotation speeds, the rotation speed of the tire 2 and the rotation speed of the blade attachment unit 22 and the blade 20), ON / OFF, etc. The control unit 60 controls connected devices to control the rotation speed, ON / OFF, etc. by dial operation. If each part of the positioning unit 26 is configured as an electric device, the control unit 60 may electrically control these devices. The control unit 60 is electrically connected to the tire rotation drive unit 14, the blade rotation drive unit 24, etc. These electrical connections may be made via wireless communication, etc. Furthermore, when automatically controlling the tire rotation drive unit 14, the blade rotation drive unit 24, etc. based on a program, the control unit 60 may have a built-in CPU, memory, etc., and in that case, controls connected devices to control the rotation speed, ON / OFF, etc. based on a predetermined control program recorded in the memory, etc.

[0055] The tire shredding device 1 may further include a liquid reservoir 62 for storing a liquid 64 containing a surfactant component, as shown in FIG. 4 (the liquid reservoir 62 is not shown in other figures). The liquid reservoir 62 is disposed below the tire so that the tread portion 4 and shoulder portion 5 at the bottom of the tire 2 are immersed in the liquid 64. The liquid reservoir 62 is formed in a rectangular shape when viewed from above, and is formed so that it can store, for example, a liquid 64 containing a surfactant component (part of the liquid surface is indicated by a dashed line in FIG. 4) inside. The liquid 64 containing a surfactant component is, for example, a liquid obtained by diluting a neutral detergent with water, soapy water, etc. The inclusion of a surfactant component makes it easier for the blade edge to shave the tire smoothly. The liquid reservoir 62 is formed so that the lowest part of the tire 2 held by the tire holding part 12 is contained inside, and the lower ends of the tread portion 4 and shoulder portion 5 are immersed in the liquid 64. This allows the tire surface to be wetted, and the tire is cooled by the liquid and the cooling caused by the evaporation of the liquid, making it easier to scrape with the cutting edge. In particular, when the tire is relatively hot, scraping the tire while cooling it with the liquid reservoir 62 makes it easier to form the tire into a predetermined shape. Note that using a liquid that does not contain surfactant components, such as water, instead of a liquid containing surfactant components, also has a certain effect on cooling the tire. Note that the liquid reservoir 62 may be omitted.

[0056] Next, with reference to FIG. 9, a tire shaving method according to this embodiment will be described. 9, in the tire shaving method, first, in S1, a preparation step is performed to prepare the tire shaving device 1 as described above. In the tire shaving device 1, for example, the blade 20 is attached to the blade attachment portion 22, and the tire shaving device 1 is made operable. After the tire shaving device 1 preparation step S1 is performed, the process proceeds to S2.

[0057] In S2, an attachment step is executed in which the tire 2 to be scraped is attached to the tire holding portion 12. The tire 2 is rotatably held by the tire holding portion 12. After the attachment step S2 is executed, the process proceeds to S3.

[0058] In S3, a tire rotation step is executed. The tire 2 is rotated in a predetermined rotation direction by the tire rotation drive unit 14 while being held by the tire holding unit 12. In the tire rotation step S3, the tire 2 is rotated in the rotation direction indicated by arrow B (see FIG. 7) at a rotation speed within a range of 0.5 rotations / minute to 5 rotations / minute. After the tire rotation step S3 is executed, the process proceeds to S4.

[0059] In S4, a blade rotation step is executed in which the blade attachment portion 22 to which the blade 20 is attached is rotated. In the blade rotation step S4, the blade attachment portion 22 and the blade 20 are rotated in a predetermined rotation direction as shown by arrow C (see FIG. 7). The blade attachment portion 22 and the blade 20 are rotated at a rotation speed within a range of 1000 to 8000 revolutions per minute. After the blade rotation step S4 is executed, the process proceeds to S5. The tire rotation step S3 and the blade rotation step S4 may be executed in the reverse order, or may be synchronized so as to be executed almost simultaneously.

[0060] Next, in S5, a positioning step S5 is performed in which the blade 20 is positioned at a predetermined distance from the center axis X2 of the tire 2. In the positioning step S5, the positioning unit 26 positions the blade 20, for example, the cutting edge 20a of the blade 20, at a predetermined distance from the center axis X2 of the tire. This makes it possible to set how deep the surface of the tire 2 will be scraped away by the blade 20 and what diameter (and shape) of the tire will ultimately be formed. When the positioning step S5 is performed and the cutting edge 20a of the blade 20 is advanced to a position where it will come into contact with the tire 2, scraping of the surface begins and the process automatically proceeds to S6. In other words, S5 and S6 may be performed almost simultaneously. Furthermore, part of the positioning step S5 may be performed simultaneously with or before or after steps up to S4. For example, positioning in the second direction by the second adjustment mechanism 36 may be performed before S3.

[0061] Next, in S6, a tire scraping step S6 is performed in which the blade 20 scrapes off the surface of the tire 2. In the tire scraping step S6, the blade 20 is rotated at a predetermined rotation speed by the blade rotation drive unit 24. The tire 2 is also rotated at a predetermined rotation speed by the tire rotation drive unit 14. The rotating blade 20 comes into contact with the tire surface, scraping off the tire surface. This allows all or at least a portion of the heat-degraded portion (hardened and deteriorated portion) on the tire surface due to the heat cycle during running to be removed. Furthermore, the blade 20 can scrape off the tire surface in a manner that suppresses deterioration due to heating of the tire surface associated with scraping. In other words, the heat generated when scraping off the tire surface is relatively small compared to the heat generated when grinding the tire surface, so deterioration due to heating of the tire surface can be suppressed. The position where the blade 20 started scraping off the tire 2 is marked on the tire 2, and after scraping has been performed until one circumference of the tread portion 4 has been reached, the first adjustment mechanism 34 advances the cutting edge 20a of the blade 20 further into the tire 2. In this way, by limiting the scraping depth to, for example, about 0.1 mm to 1 mm per scraping and scraping in multiple steps, the load on the tire can be reduced.

[0062] In the tire scraping step S6, a liquid reservoir 62 may be provided below the tire 2, and the tire surface may be scraped while the lower ends of the tread and shoulder portions of the tire 2 are immersed in liquid 64. The tire surface can be processed more efficiently by storing a liquid such as a diluted neutral detergent with water or soapy water in the liquid reservoir 62 and scraping the tire surface while cooling it. This configuration improves lubrication during scraping using the surfactant in the neutral detergent, and cools the tire rubber, making it easier to cut when scraping. Furthermore, the tire scraping step S6 can be performed without wetting the tire. The blade 20 also has a linear cutting edge, and cuts the surface of the tire 2 so as to cut off a predetermined width in the left-right direction. This makes it easier to scrape the tread portion 4 of the tire 2 flat. By scraping the surface of the tire 2 with the blade 20, it is possible to form the running surface of the tire (the surface of the running tread portion 4 and the surface of the shoulder portion 5) at a predetermined distance from the center axis of the tire 2, rather than a processed surface for retreading. The running surface is, for example, the contact surface of the tread portion with the road surface, or, for example, the contact surface of the running tread portion with the road surface and / or the contact surface of the shoulder portion with the road surface. Furthermore, the blade 20 does not only remove the beards of the tire 2, but scrapes the surface so as to form a flat surface of a predetermined width on the tread portion on which the beards are formed. This prevents slight irregularities at the base of the beards from remaining on the tread portion, and the blade 20 can form a running surface for time attack running, etc., in which even slight irregularities on the surface are suppressed.

[0063] FIG. 8 illustrates the state of a tire after shaving. FIG. 8 is a partially enlarged cross-sectional view of a tire shaved by the tire shaving device of this embodiment. The cross-sectional shape of the tire 2 before shaving is shown by a solid line, and the surface shape of the tread portion 4 of the tire after shaving is shown by a dashed line as a shaved surface 2a. The shaving depth (amount) is shown merely as an example, as the purpose is to clearly show the shaved state. For example, by shaving the tread portion 4 of the tire 2 flat along the axial direction, the tire's contact area in the width direction is improved, resulting in a tire running surface that can easily maximize the tire's running performance. Furthermore, by shaving off portions of the surface that have hardened and deteriorated due to the heat cycle after running, a relatively soft and fresh surface is exposed, making it easier for the tire to regain its original running performance. Furthermore, the tire shaving device 1 can remove dirt and other debris that adheres to the surface of the tire 2 during circuit running, thereby cleaning the tire surface and making it easier for the tire to demonstrate its original running performance the next time it is run.

[0064] Since a tire with its surface shaved is manufactured by steps S1 to S6 in the tire shaving method, these steps are also described as a method for manufacturing a tire with its surface shaved.

[0065] According to one embodiment of the present invention configured as described above, by scraping the surface of the tire 2, it is possible to form the running surface of the tire 2 at a predetermined distance from the center axis X2 of the tire 2 while suppressing thermal degradation of the surface of the tire 2 during scraping. This makes it possible to form a running surface in the tread portion 4 of the tire 2 that improves ground contact while suppressing thermal degradation of the surface of the tire 2 during scraping, and to form a running surface on the tire 2 that approximates a circle with a predetermined diameter. Therefore, it is possible to form a running surface of the tire 2 that makes it easier to maximize the running performance of the tire 2. Therefore, for example, in a tire 2 used for a time attack on a circuit, it is easier to maximize the inherent running performance of the tire 2 in order to reduce the time by 0.1 seconds or so.

[0066] According to one embodiment of the present invention configured in this manner, the cutting edge line along the cutting edge 20a of the blade 20 is disposed on a second imaginary plane (e.g., second imaginary plane E2 or second imaginary plane E3) parallel to a first imaginary plane (e.g., first imaginary plane E1 or first oblique imaginary plane E4) passing through the central axis X2 of the tire 2. As a result, by scraping off the surface of the tire 2, a relatively flat surface along the second imaginary plane parallel to the first imaginary plane including the central axis X2 of the tire is easily formed on the surface of the tire 2. Therefore, it is possible to more easily suppress thermal degradation caused by scraping off the surface of the tire 2, and it is also possible to more easily form a running surface of the tire 2 that makes it easier to maximize the running performance of the tire 2.

[0067] According to one embodiment of the present invention configured as described above, the cutting edge line along the cutting edge 20a of the blade 20 is tilted from a state parallel to the central axis X2 of the tire 2 at an angle within a range of +45 degrees to −45 degrees with respect to the central axis X2 in the tangential direction of the tire 2. As a result, scraping off the surface of the tire 2 makes it easier to form a relatively flat surface on the surface of the tire 2 that is along a plane that includes the central axis X2 of the tire in the tangential direction of the tire 2. This makes it easier to suppress thermal degradation caused by scraping off the surface of the tire 2 and to form a running surface of the tire 2 that makes it easier to maximize the running performance of the tire 2.

[0068] According to one embodiment of the present invention configured in this manner, the cutting edge of the blade 20 extends in a direction parallel to the central axis X2 of the tire 2 and can extend in a direction parallel to the surface of the tire 2. This makes it easier to scrape off the surface of the tire 2, thereby forming a flat plane on the surface of the tire 2 in a direction parallel to the central axis X2 of the tire 2. This makes it easier to suppress thermal degradation caused by scraping off the surface of the tire 2, and makes it easier to form a running surface of the tire 2 that makes it easier to maximize the running performance of the tire 2.

[0069] According to one embodiment of the present invention configured as described above, the angle of the cutting edge 20a is set to be within a range of 30 to 60 degrees. This makes it possible to further suppress the generation of heat when scraping off a relatively thin portion of the surface of the tire 2. This makes it possible to further suppress thermal deterioration caused by scraping off the surface of the tire 2.

[0070] According to one embodiment of the present invention configured as described above, the angle of the cutting edge 20a is set to a predetermined angle, and the rotation speed of the blade attachment unit 22 rotated by the blade rotation drive unit 24 is within a range of 1,000 to 8,000 rotations per minute. As a result, when the cutting edge 20a enters the surface of the tire 2 toward the upstream side in the rotation direction of the tire 2, the surface of the tire 2 is more likely to be cut away from a position further upstream than the tip of the cutting edge 20a. This further reduces the generation of heat when scraping the surface of the tire 2. This further reduces thermal degradation caused by scraping the surface of the tire 2.

[0071] According to one embodiment of the present invention configured as described above, the angle of the cutting edge 20a is set to a predetermined angle, and the rotation speed of the blade attachment portion 22 rotated by the blade rotation drive unit 24 is set to be greater than the rotation speed of the tire. As a result, the cutting edge 20a rotated by the blade rotation drive unit 24 enters the surface of the tire 2 at a speed greater than the rotation speed of the tire 2. Therefore, even when the tire 2 is rotating, when the cutting edge 20a enters the surface of the tire 2 toward the upstream side in the rotation direction of the tire 2, the surface of the tire 2 is more likely to be cut from a position further upstream than the tip of the cutting edge 20a. This further reduces the generation of heat when scraping the surface of the tire 2. This further reduces thermal degradation caused by scraping the surface of the tire 2.

[0072] According to one embodiment of the present invention configured as described above, the peripheral speed of the blade 20 is a value within a range of 150 m / min to 1300 m / min. As a result, when the cutting edge 20a enters the surface of the tire 2, the surface of the tire 2 is more likely to be cut away from a position further upstream than the tip of the cutting edge 20a. This makes it possible to further suppress the generation of heat when scraping the surface of the tire 2. This also makes it possible to further suppress thermal degradation caused by scraping the surface of the tire 2.

[0073] According to one embodiment of the present invention configured as described above, the tire shredding device 1 further includes a liquid reservoir 62 for storing liquid, and the liquid reservoir 62 is arranged so that the lower part of the tire 2 is immersed in the liquid. This allows the tire 2 to be cooled and easier to shred with the blade 20, and also allows the components of the liquid, for example, to make it easier for the edge of the blade 20 to shred the tire 2 smoothly into a desired shape.

[0074] According to one embodiment of the present invention configured as described above, by scraping the surface of the tire 2, it is possible to form the running surface of the tire 2 at a predetermined distance from the center axis X2 of the tire 2 while suppressing thermal degradation of the surface of the tire 2 during scraping. This makes it possible to form a running surface in the tread portion 4 of the tire 2 that improves ground contact while suppressing thermal degradation of the surface of the tire 2 during scraping, and to form a running surface on the tire 2 that approximates a circle with a predetermined diameter. Therefore, it is possible to form a running surface of the tire 2 that makes it easier to maximize the running performance of the tire 2. Therefore, for example, in a tire 2 used for a time attack on a circuit, it is easier to maximize the inherent running performance of the tire 2 in order to reduce the time by 0.1 seconds or so.

[0075] The embodiments of the present invention are not limited to those described above, and other modifications may be applied. The tire shredding device 1 may further include a third adjustment mechanism configured to tilt the blade 20 obliquely in the vertical direction. The third adjustment mechanism is a mechanism that can change the height of the support portions on the right and left sides of the blade attachment portion 22. As a result, for example, when the blade 20 is attached to the blade attachment portion 22, the cutting edge line along the cutting edge 20a is tilted from parallel to the center axis X2 at an angle ranging from +45 degrees to -45 degrees relative to the center axis X2 in the tangential direction of the tire. For example, the right side of the cutting edge 20a is positioned slightly above the left side, and the cutting edge 20a is positioned at an angle of approximately 5 degrees. The blade is positioned obliquely downward from right to left relative to the tire tread portion. Here, when the tire temperature is relatively high after a motorsport run (for example, for about a day after high-speed driving) or when the ambient temperature is high and the tire temperature is relatively high, if the entire blade 20 of a predetermined width (for example, approximately 80 mm) is placed against the tire surface and an attempt is made to scrape the tire to a depth of, for example, 0.5 mm or more, the rubber may not be able to withstand the load and may become soft and tear like string cheese. To address this issue, if the blade cutting edge 20a is tilted left and right on a plane (for example, imaginary plane E2) vertical to the center axis X2 (for example, by tilting the blade 20 and blade attachment portion 22), the load due to resistance on the tire surface can be reduced and tearing of the tire surface can be prevented. Furthermore, because the blade 20 is only slightly tilted up and down, it is still easy for the blade 20 to form a flat surface on the tire surface. Therefore, this structure achieves both efficient tire scraping and improved reliability. [Explanation of symbols]

[0076] 1: Equipment 2: Tires 2a: Tires 4: Tread area 6: Outer periphery 12: Tire holding part 14: Tire rotation drive unit 20: Blade 20a: cutting edge 22: Blade attachment part 24: Blade rotation drive unit 26: Positioning section B: Rotation direction C: Rotation direction X1: Center axis line X2: Center axis line X3: Center axis

Claims

1. A tire scraping device for scraping the surface of a tire, A blade that scrapes the surface of the tire; a blade attachment portion for attaching the blade; a blade rotation drive unit that rotates the blade attachment unit; a tire holding portion that holds the tire; a tire rotation drive unit that rotates the tire while holding the tire; a positioning portion that can position the blade at a predetermined distance from a center axis of the tire, A tire scraping device that scrapes the surface of the tire to form a running surface of the tire at a predetermined distance from the center axis of the tire while suppressing thermal deterioration of the surface of the tire during scraping.

2. 2. The tire shredding device according to claim 1, wherein a cutting edge line along the cutting edge of the blade is disposed on a second imaginary plane parallel to a first imaginary plane passing through the center axis of the tire.

3. The tire scraping device according to claim 2, wherein the cutting edge line along the cutting edge of the blade is inclined at an angle within a range of +45 degrees to -45 degrees in the tangential direction of the tire from a state parallel to the center axis of the tire.

4. The tire shredding device according to claim 2, wherein the cutting edge of the blade extends in a direction parallel to the center axis of the tire.

5. 3. The tire shredding device of claim 2, wherein the cutting edge of the blade has an angle within a range of 30 to 60 degrees.

6. 6. The tire shredding device according to claim 5, wherein the rotation speed of the blade attachment portion rotated by the blade rotation drive portion is within a range of 1000 rpm to 8000 rpm.

7. The tire shredding device according to claim 5, wherein the rotational speed of the blade attachment portion rotated by the blade rotation drive portion is greater than the rotational speed of the tire rotated by the tire rotation drive portion.

8. 6. The tire shredding device according to claim 5, wherein the peripheral speed of the blade attached to the blade attachment portion is within a range of 150 m / min to 1300 m / min.

9. The tire shredding device according to any one of claims 1 to 8, further comprising a liquid reservoir for storing liquid, the liquid reservoir being positioned so that a lower portion of the tire is immersed in the liquid.

10. A tire scraping method for scraping the surface of a tire, comprising: a blade rotation step of rotating the blade attachment portion to which the blade is attached; a tire rotation step of rotating the tire while holding the tire; a positioning step of positioning the blade at a predetermined distance from the center of the tire; and a tire shaving step of shaving the surface of the tire to form a running surface of the tire at a predetermined distance from the center axis of the tire while suppressing thermal deterioration of the surface of the tire during shaving.

Images