Nose type impressionless solid tire and manufacturing method thereof

Abstract

The invention discloses a nose type imprint-free solid tire and a manufacturing method thereof. The nose type imprint-free solid tire comprises a base part, a tread part, a first tire side part and a second tire side part, wherein the first tire side part and the second tire side part are arranged on the two axial sides of the tire in a one-to-one correspondence manner; the radial inner side of the first tire side part is provided with a nose area, and the nose area is used for being assembled to a nose groove of a rim; the first sidewall portion and the second sidewall portion each have an outboard non-impression rubber, the non-impression rubber of the first sidewall portion extending from the outboard in the tire radial direction to the inboard in the tire radial direction, and the cover surface including the entire nose region; the non-mark rubber of the first tire side part is formed by vulcanizing first tire bead rubber located in a nose area and second tire bead rubber attached to the first tire bead rubber, the first tire bead rubber and the second tire bead rubber have an overlapping area in the radial direction of the tire, and the color of the first tire bead rubber is the same as that of the second tire bead rubber; and the non-mark rubber of the second tire side part is formed by vulcanizing the second tire bead rubber. The nose type imprint-free solid tire has the advantages that the appearance aesthetic feeling and the use stability can be realized.

Description

Technical Field

[0001] This invention relates to the field of tire technology, and in particular to a nose-type solid tire without imprinting and its manufacturing method. Background Technology

[0002] Solid tires can be divided into black tires and clean tires according to the color of the rubber. For example, non-black rubber tires such as white tires and gray tires are all clean solid tires. Clean tires are also known as non-marking solid tires because they leave virtually no tire marks and do not contaminate products. They are mainly used in cleanroom environments with strict environmental requirements, such as food and beverage processing, papermaking, pharmaceutical production, and optoelectronics.

[0003] Solid tires can be classified into split solid tires and nose-type solid tires according to their bead structure. Split solid tires are often equipped with multi-piece rims, and their bead sections are symmetrically arranged. Nose-type solid tires are equipped with simple one-piece rims, and the bead section of nose-type solid tires is asymmetrically arranged, that is, one side of the bead of the nose-type solid tire has a radial protrusion (commonly known as the "nose"), which is inserted into the nose groove of the one-piece rim during installation.

[0004] Currently, solid tires with a nose and no marking feature generally suffer from a trade-off between appearance and performance: On the one hand, existing products commonly exhibit uneven sidewall coloring in the nose area, with the nose area predominantly black rubber and the remaining sidewalls covered in non-marking rubber. This uneven coloring negatively impacts the aesthetic appeal, leading some customers to refuse to accept such products. On the other hand, if the non-marking rubber sidewall is applied to cover the entire sidewall to maintain appearance, the physical properties of the non-marking rubber differ from the black rubber of the tire body, particularly in hardness and flowability. During vulcanization, the non-marking rubber sidewall tends to flow towards the nose area and accumulate, resulting in a decrease in the overall hardness of the nose area. Consequently, the "nose" is prone to detaching from the rim groove during use, affecting stability.

[0005] Regarding the aforementioned issue of preventing the nose of a solid tire with a nose from coming off, relevant technologies have proposed corresponding solutions, but all have limitations: For example, the patent with publication number JP7424024B2 alleviates stress concentration and inhibits deformation by setting protruding inner and outer rubber layers with different hardness, but it does not address the issue of uniform appearance of the tire without imprints, and cannot solve the technical problem of the nose coming off the bead due to rubber accumulation when the rubber in the nose area covers the sidewall area; the patent with publication number CN220973829U optimizes the bead curve to avoid rubber debris, but does not solve the problem of the visual aesthetics of the nose side of the tire without imprints and the problem of the nose coming off the bead due to the accumulation of rubber on the nose side; the patent application with publication number CN119928466A optimizes the nose curve and the bottom of the bead, addressing the problems of clamping and improper pressing during tire installation, but does not address the issues of the nose coming off during use and the aesthetic appearance. Summary of the Invention

[0006] This invention aims to at least partially solve one of the technical problems in the aforementioned technologies. Therefore, one objective of this invention is to provide a nose-type solid tire without imprinting and its manufacturing method, solving the technical problems of uneven color in existing nose-type solid tires and the nose easily detaching from the rim groove due to rubber accumulation when rubber flows into the nose area when the imprinting rubber covers the sidewall region, thus achieving a balance between aesthetic appearance and operational stability.

[0007] To achieve the above objectives, the present invention provides a nose-type solid tire without imprints, comprising a base portion and a tread portion, or comprising a base portion, an intermediate portion and a tread portion, and a first sidewall portion and a second sidewall portion respectively disposed on both sides of the tire axial direction.

[0008] The first tire sidewall has a nose region on its radially inner side, the nose region being used for mounting to the nose groove of the rim;

[0009] Both the first and second tire sidewalls have an outer non-marking rubber, the non-marking rubber of the first tire sidewall extends from the radially outer side of the tire to the radially inner side of the tire, and the coverage area includes the entire nose area.

[0010] The non-marking rubber on the first sidewall is formed by vulcanizing a first sidewall rubber located in the nose area and a second sidewall rubber bonded to the first sidewall rubber. The first sidewall rubber and the second sidewall rubber have an overlapping area in the radial direction of the tire, and the first sidewall rubber and the second sidewall rubber are the same color.

[0011] The non-marking rubber on the second tire sidewall is formed by the vulcanization of the second tire sidewall rubber.

[0012] According to an embodiment of the present invention, a nose-mounted, non-marking solid tire utilizes an overlapping design of a first sidewall rubber and a second sidewall rubber to control the distribution and flow of the rubber compound in different areas. For example, adjusting the distribution of the rubber compound during bonding and the flowability during vulcanization reduces the risk of accumulation in the nose area. Alternatively, adjusting the hardness of the first sidewall rubber ensures sufficient hardness in the nose area when the sidewall rubber covers the tire sidewall region, preventing the nose from coming off the bead. Furthermore, the identical color of the first and second sidewall rubbers, the overlapping design on the first tire sidewall, and the coverage of the entire nose area prevent the black body rubber from showing through, resulting in a uniform sidewall color without any gray-to-black tint, thus ensuring a visually appealing appearance.

[0013] In addition, the nose-type solid tire with no indentation provided in the above embodiments of the present invention may also have the following additional technical features:

[0014] Optionally, the nose region includes a nasal curve and a nasal mating portion, wherein the average thickness of the non-marking rubber in the nasal mating portion is ≤2.5mm; and the hardness of the non-marking rubber in the nasal mating portion is ≥75 Shore A.

[0015] Optionally, the first sidewall rubber is cooled and shaped before vulcanization.

[0016] Optionally, both the first and second sidewall rubbers are cooled and shaped before vulcanization, and the second sidewall rubber has at least two stacked rubber sheets.

[0017] Optionally, the hardness of the first sidewall rubber is greater than that of the second sidewall rubber.

[0018] Furthermore, the hardness difference between the first sidewall rubber and the second sidewall rubber is ≥10 Shore A.

[0019] Optionally, the radial height of the overlapping area is 2mm to 20mm.

[0020] In another aspect, the present invention provides a method for manufacturing the above-mentioned nose-type solid tire without indentation, which includes the following steps:

[0021] S1. Provide a fetal body, the fetal body including a base portion and a fetal face portion, or including a base portion, a middle portion and a fetal face portion, as well as a nose side and a non-nose side of the fetal body located on both sides of the axial direction of the fetal body.

[0022] S2. Provide a first tire sidewall rubber and a second tire sidewall rubber, both of which are made of non-marking rubber material, wherein the first tire sidewall rubber is extruded by an extrusion device and then cooled and shaped.

[0023] S3. The first sidewall adhesive is attached to the tire nose side near the radial inner side of the tire, and a second sidewall adhesive is attached to the tire nose side near the radial outer side of the tire, so that the first sidewall adhesive and the second sidewall adhesive have an overlapping area in the radial direction of the tire, and another second sidewall adhesive is attached to the tire non-nose side.

[0024] S4. After the first and second sidewall rubbers are bonded together, the tire body is vulcanized and finished to produce a nose-type solid tire without imprints.

[0025] According to an embodiment of the present invention, a method for manufacturing a nose-type solid tire without imprinting involves extruding and cooling the first sidewall rubber through an extrusion device. The first sidewall rubber is then in a low-temperature solid state (unlike existing hot sidewall rubber picked up directly from an open mill). This restricts the movement of rubber molecular chains, reduces fluidity during vulcanization, and allows for precise pre-setting of the cross-sectional dimensions and initial hardness of the first sidewall rubber. This ensures a reasonable distribution of the sidewall rubber, especially the imprint-free rubber in the nose area, avoiding uneven thickness caused by the flow of hot rubber. The overlapping area design of the first and second sidewall rubber prevents localized blackening on the sidewall, resulting in a uniform, non-black imprint-free rubber color. This solves the technical problems of uneven color and the nose's tendency to detach from the rim groove due to rubber accumulation when the imprint-free rubber covers the sidewall area, thus achieving a balance between aesthetic appeal and operational stability.

[0026] Furthermore, the method for manufacturing a nose-type solid tire without indentation according to the above embodiments of the present invention may also have the following additional technical features:

[0027] Optionally, in step S3, the radial inner end of the first sidewall adhesive extends 0-15 mm beyond the radial inner end of the nose side of the tire body.

[0028] Optionally, the cooling and shaping temperature of the first sidewall adhesive is lower than the bonding temperature of the second sidewall adhesive;

[0029] Alternatively, after the second sidewall rubber is extruded by the extrusion equipment and cooled and shaped, the second sidewall rubber that is attached to the tire nose side near the radial outer side of the tire has at least two stacked rubber sheets.

[0030] Alternatively, the hardness of the first sidewall rubber may be greater than that of the second sidewall rubber. Attached Figure Description

[0031] Figure 1 (1a) is a partial cross-sectional view of the nose-type solid tire without imprints in an embodiment of the present invention, and (1b) is a cross-sectional view of the rim that is fitted with the nose-type solid tire without imprints in (1a).

[0032] Figure 2 A schematic diagram of the first embodiment of the tire carcass structure for manufacturing the nose-type non-marking solid tire of the present invention;

[0033] Figure 3 A schematic diagram of a second embodiment of the tire carcass structure for manufacturing the nose-type non-marking solid tire of the present invention;

[0034] Figure 4 A schematic diagram of a third embodiment of the tire carcass structure for manufacturing the nose-type non-marking solid tire of the present invention;

[0035] Figure 5 A schematic diagram of the fourth embodiment of the tire carcass structure for manufacturing the nose-type non-marking solid tire of the present invention;

[0036] Figure 6 The figures are partial cross-sectional views of a nose-type solid tire without imprints, wherein (6a) is a partial cross-sectional view of a prior art tire and (6b) is a partial cross-sectional view of the tire of the present invention. Detailed Implementation

[0037] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0038] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the invention to those skilled in the art.

[0039] To more clearly describe this application, the orientation of the tire is first defined. The tire has a center of rotation and a tire center plane CL. The direction about the tire center of rotation is defined as the tire circumferential direction. The direction parallel to the tire center of rotation along the tire cross-sectional width is defined as the tire axial direction. The direction closer to the tire center plane CL is defined as the axial inner side, and the direction away from the tire center plane CL is defined as the axial outer side. The direction perpendicular to the tire center of rotation along the tire cross-sectional height is defined as the tire radial direction. The direction closer to the tire center of rotation is defined as the radial inner side, and the direction away from the tire center of rotation is defined as the radial outer side. The cross-sectional view of the nose-type solid tire without imprint shown in the illustrations of this invention should be understood as a schematic illustration.

[0040] This application is based on the inventor's considerations as follows: To ensure that the sidewall area of ​​a nose-type solid tire with no-marking features a non-black, non-marking rubber color, the tire manufacturing process typically involves applying non-black, non-marking rubber sidewall material to cover the entire sidewall area. This results in a finished tire with a non-black, non-marking rubber sidewall after vulcanization, providing a visually appealing overall appearance. However, the physical properties of the non-marking rubber sidewall material differ from the black rubber of the solid tire body, especially the base rubber constituting the nose area, particularly in hardness and flowability. When the non-black, non-marking rubber sidewall material covers the entire sidewall, it flows towards the nose area during vulcanization, causing accumulation. The inner side of the tire nose area is covered with black base rubber, while the outer side accumulates more non-black, non-marking rubber. The non-black, non-marking rubber has significantly lower physical properties, especially hardness, than the black base rubber. This reduces the overall hardness of the tire nose area, weakening its ability to withstand various complex pressures during use, thus greatly increasing the probability of the tire nose detaching from the rim groove during operation.

[0041] Furthermore, the current production method for bonding the sidewall rubber of solid tires involves directly picking up appropriately sized pieces of non-marking rubber from the open mill in the molding backstage and bonding them to the green tire carcass. At this time, the sidewall rubber is in a hot state with relatively high flowability, easily flowing towards the nose area and causing the non-marking rubber to accumulate there. To ensure that the nose side of a nose-type non-marking solid tire is covered with non-black non-marking rubber, the sidewall rubber thickness is appropriately reduced to some extent to decrease rubber flow and accumulation in the nose area. However, a thinner sidewall rubber is prone to stretching and deformation during molding, resulting in poor workability and the risk of uneven rubber distribution due to stretching and deformation, which could cause the non-marking rubber to penetrate the black body rubber and appear grayish. The overall visual appearance of the tire remains unsatisfactory.

[0042] Therefore, this invention proposes a nose-type non-marking solid tire, comprising a base portion and a tread portion, or comprising a base portion, a middle portion and a tread portion, and a first sidewall portion and a second sidewall portion correspondingly disposed on both sides of the tire axial direction; the radially inner side of the first sidewall portion has a nose region, the nose region being used for mounting to the nose groove of the rim; both the first and second sidewall portions have outer non-marking rubber, the non-marking rubber of the first sidewall portion extending from the radially outer side of the tire to the radially inner side of the tire, and the covering surface including the entire nose region; the non-marking rubber of the first sidewall portion is formed by vulcanizing a first sidewall rubber located in the nose region and a second sidewall rubber bonded to the first sidewall rubber, the first sidewall rubber and the second sidewall rubber having an overlapping area in the radial direction of the tire, and the first sidewall rubber and the second sidewall rubber having the same color; the non-marking rubber of the second sidewall portion is formed by vulcanizing the second sidewall rubber. Thus, on the nose side of the tire (corresponding to the first sidewall of the tire), the overlapping design of the first and second sidewall rubbers allows for zoned control of the rubber distribution and flow. For example, adjusting the distribution of the imprint-free rubber on the sidewall during the application of the first sidewall rubber and its flowability during vulcanization reduces the risk of accumulation in the nose area. Alternatively, adjusting the hardness of the first sidewall rubber ensures that the rubber in the nose area has sufficient hardness to prevent the nose from coming off the bead. In addition, the matching color of the first and second sidewall rubbers, the overlapping design on the first sidewall, and the coverage of the entire nose area prevent the black body rubber from showing through, resulting in a uniform sidewall color without any gray-toned black showing through, ensuring a visually appealing appearance.

[0043] Meanwhile, this invention also proposes a method for manufacturing a nose-type solid tire without imprinting, which includes the following steps:

[0044] S1. Provide a fetal body, which includes a base portion, a fetal face portion, or includes a base portion, a middle portion and a fetal face portion, as well as a nose side and a non-nose side of the fetal body located on both sides of the axial direction of the fetal body.

[0045] S2. Provide a first tire sidewall rubber and a second tire sidewall rubber. Both the first tire sidewall rubber and the second tire sidewall rubber are made of non-marking rubber material. The first tire sidewall rubber is extruded by an extrusion device and then cooled and shaped.

[0046] S3. Apply a first sidewall rubber compound to the tire nose side near the radially inner side of the tire, and apply a second sidewall rubber compound to the tire nose side near the radially outer side of the tire, so that the first and second sidewall rubber compounds overlap in the radial direction of the tire. Apply another second sidewall rubber compound to the tire body on the non-nose side. It should be noted that when applying the sidewall rubber compound to the tire nose side, you can first apply the first sidewall rubber compound to the tire nose side near the radially inner side of the tire, and then apply a second sidewall rubber compound to the radially outer side of the first sidewall rubber compound, so that the first and second sidewall rubber compounds overlap in the radial direction of the tire. Alternatively, you can first apply a second sidewall rubber compound to the tire nose side near the radially outer side of the tire, and then apply the first sidewall rubber compound to the radially inner side of the second sidewall rubber compound, so that the first and second sidewall rubber compounds overlap in the radial direction of the tire. This should be understood as meaning that there is no strict requirement for the order in which the first and second sidewall rubbers are applied to the nose side of the tire. The key is to distribute the non-marking rubber on the nose side of the tire reasonably, ensuring that there is no blackening in the sidewall area and that there is no excessive accumulation of non-marking rubber in the nose area, which could cause problems such as the nose coming off the bead.

[0047] S4. After the first and second sidewall rubbers are bonded together, the tire body is vulcanized and finished to produce a nose-type solid tire without imprints.

[0048] Thus, after the first sidewall rubber is extruded and cooled by the extrusion equipment, it is in a low-temperature solid state (unlike the hot sidewall rubber picked up directly from the open mill in the existing system). The movement of rubber molecular chains is restricted, the fluidity during vulcanization is reduced, and the cooling and setting allows the cross-sectional size and initial hardness of the first sidewall rubber to be precisely preset. The sidewall rubber is reasonably distributed, especially the non-marking rubber in the nose area, avoiding excessive accumulation of rubber due to flow in the hot state. The design of the overlapping area of ​​the first and second sidewall rubber avoids local black exposure on the sidewall, resulting in a uniform non-black non-marking rubber color on the sidewall. This solves the technical problems of uneven appearance color and easy nose detachment from the rim nose groove caused by rubber accumulation when the non-marking rubber covers the sidewall area in the existing nose-type non-marking solid tires. It achieves a dual balance between aesthetic appearance and service stability.

[0049] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0050] Example 1

[0051] Figure 1Figure a is a partial cross-sectional view of the nose-type solid tire without tread patterns of the present invention. The nose-type solid tire T shown has a base portion 10 and a tread portion 20, or a base portion 10, a tread portion 20, and a middle portion (not shown). The tread portion 20 has a tread pattern and contacts the ground to achieve tire grip, wear reduction, and other functions. The base portion 10 is used to mate with the rim R and be installed on the vehicle. When the solid tire has a middle portion, the middle portion is located between the tread portion 20 and the base portion 10, mainly serving a cushioning function.

[0052] Figure 1 b is the same as the above. Figure 1 A schematic diagram of the cross-sectional structure of a rim fitted with a nose-type, non-marking solid tire.

[0053] Among them, the nose-type solid tire T also has a first tire sidewall 30 and a second tire sidewall 40. The radially inner side of the first tire sidewall 30 has a nose area, which is used to mate with the nose groove Ra when assembling with the rim R. The nose area of ​​the first tire sidewall 30 has a nose curved portion 30b and a nose mating portion 30a. During the tire assembly process of the nose-type solid tire, the nose mating portion 30a is suitable for engaging with the nose groove Ra, and the nose curved portion 30b participates in deformation during the engagement of the nose mating portion 30a, so that the nose mating portion 30a can smoothly engage with the nose groove Ra of the rim R.

[0054] Both the first tire sidewall 30 and the second tire sidewall 40 have an outer non-marking rubber T1 and an inner body rubber T2, and the outer non-marking rubber T1 of the first tire sidewall 30 extends from the radially outer side of the tire to the radially inner side of the tire and covers the entire nose area (i.e., the coverage of the non-marking rubber T1 includes the entire nose area). Of course, it is known that the tread portion 20 of the nose-type non-marking solid tire is made of the same color non-marking rubber as the first tire sidewall 30 and the second tire sidewall 40.

[0055] The first tire sidewall 30, with its non-marking rubber, is formed by vulcanizing a first sidewall rubber located in the nose area and a second sidewall rubber bonded to the first sidewall rubber. The first and second sidewall rubbers overlap in the radial direction of the tire. The second tire sidewall 40, with its non-marking rubber, is formed by vulcanizing the second sidewall rubber. In other words, the entire non-marking rubber surface of the first tire sidewall 30 is formed by vulcanizing and bonding at least two sidewall rubbers overlapping each other. The entire non-marking rubber surface of the second tire sidewall 40, according to current technology, can be formed by vulcanizing and bonding a single sidewall rubber. Thus, the at least two sidewall rubbers of the first tire sidewall 30 can be designed separately, allowing for regional control of the distribution and flow of the rubber compound in the entire non-marking rubber surface of the first tire sidewall 30.

[0056] In the specific example, the thickness Te of the non-marking rubber in the nose mating part 30a is ≤2.5mm, and the hardness of the nose mating part 30a is ≥75 Shore A. If the thickness of the non-marking rubber in the nose mating part 30a is too thick, excessive accumulation of non-marking rubber in the nose area will affect the hardness of the nose mating part, leading to insufficient rigidity and the problem of the nose coming off the bead. It should be noted that the thickness referred to here is the average thickness, not the absolute thickness, and the reasonable manufacturing deviation range caused by fluctuations in rubber properties during tire manufacturing needs to be appropriately considered.

[0057] like Figure 2 As shown, Figure 2 A schematic diagram of the tire carcass structure for manufacturing the nose-type non-marking solid tire T of this embodiment. Figure 2 The illustrated nose-mounted, non-marking solid tire T is a schematic diagram of a tire carcass structure comprising a base section, an intermediate section, and a tread section. The radially inner side of the tire carcass is formed by base sections t1, t2, and t3, constituting the base section 10 of the solid tire. Base section t3 provides the securing function between the solid tire and the rim; the base section 10 forms the mounting portion that mates with the rim; the radially outer side t4 adjacent to the base section is the intermediate section; and the adjacent radially outer side t5 forms the tread section 20 of the tire.

[0058] The solid tire has a nose side and a non-nose side on either side of the tire's carcass along the axial direction. The nose side corresponds to the first sidewall portion 30, and the non-nose side corresponds to the second sidewall portion 40. When applying the sidewall rubber to the nose side, the pre-prepared first sidewall rubber t6 is applied at a designated position (i.e., applied to the radially inner side of the tire on the nose side); then, the second sidewall rubber t7 is applied (i.e., applied to the radially outer side of the first sidewall rubber t6); the second sidewall rubber t7 and the first sidewall rubber t6 have a certain degree of overlap in the radial direction of the tire. Another second sidewall rubber t8 is applied to the non-nose side. Of course, the order in which the first sidewall rubber t6 and the second sidewall rubber t7 are applied to the nose side is not strictly defined. Figure 2 The diagram shows a tire carcass structure where the first sidewall rubber t6 is applied first, followed by the second sidewall rubber t7. It should be understood that it's also possible to apply the second sidewall rubber t7 near the radially outer side of the tire on the nose side, and then apply the first sidewall rubber t6 radially inside the second sidewall rubber t7. The second sidewall rubber t7 and the first sidewall rubber t6 have a certain degree of overlap in the radial direction of the tire, for example... Figure 3 .

[0059] In a specific example, when the first sidewall adhesive t6 is attached to the nose side of the tire carcass, the radially inner end of the first sidewall adhesive t6 should be at least flush with the radially inner end of the nose side of the tire carcass, for example, with... Figure 2The radial inner end t9 of the base portion is flush with or extends beyond the radial inner end t9 of the base portion by a certain distance h1, i.e., h1 is preferably 0 to 15 mm. In this way, the non-marking rubber coverage of the nose-type non-marking solid tire after vulcanization includes the entire nose area, ensuring the visual aesthetics of the nose-type non-marking solid tire while avoiding problems such as the nose coming off the nose groove during use due to rubber accumulation.

[0060] In a specific example, the second sidewall rubber t7 and the first sidewall rubber t6 on the nose side of the tire carcass have a certain overlap in the radial direction of the tire. The radial height h2 of the overlap is preferably 2mm to 20mm. This avoids gaps in the overlap area of ​​the first sidewall rubber t6 and the second sidewall rubber t7 on the nose side of the tire carcass, which would expose the black rubber body and affect the visual aesthetics of the tire. Conversely, if the overlap width is too wide, the unmarked rubber of the second sidewall rubber t7 will flow excessively into the nose area, causing rubber accumulation and increasing the risk of the nose coming off.

[0061] It should be noted that the preparation time for the first sidewall adhesive t6, which is attached to the nose side of the tire body, the second sidewall adhesive t7, which is attached to the nose side of the tire body, and the second sidewall adhesive t8, which is attached to the non-nose side of the tire body, are different.

[0062] The existing production method for bonding sidewall rubber to solid tires involves directly picking up appropriately sized sidewall rubber (t8) from the open mill at the molding stage and bonding it to the green tire carcass. In this process, the sidewall rubber (t8) is in a hot state at a relatively high temperature, resulting in greater rubber fluidity and a thicker thickness, which easily leads to rubber accumulation in the base area. This embodiment of a nose-type, non-marking solid tire uses a pre-prepared first sidewall rubber (t6). After being extruded from the extrusion equipment using a pre-cut nozzle and cooled and shaped, it is picked up and placed in an indoor working environment for later use. This pre-prepared first sidewall rubber (t6), compared to the hot sidewall rubber (t8) picked up directly from the extrusion equipment at the molding stage in the existing technology, is in a relatively cool state at a lower temperature. It has greater dimensional stability and hardness, and its thickness can be significantly reduced compared to the existing sidewall rubber (t8). After vulcanization, the first sidewall rubber (t6) in the nose area hardly accumulates. This type of nose-mounted, non-marking solid tire, once installed, has a nose with suitable rigidity that prevents it from detaching from the rim's nose groove Ra, ensuring normal tire performance. Simultaneously, the first sidewall rubber t6, extruded from the die and cooled and shaped throughout the process, allows for dimensional optimization as needed and ensures that the sidewall with the nose is covered with non-black, non-marking rubber, resulting in a pleasing visual appearance.

[0063] The first sidewall rubber t6, used to adhere to the nose side of the tire carcass, is a non-marking rubber. Its physical properties can be the same as or different from those of the non-marking rubber in the second sidewall rubber t7; however, the color of the rubber must be the same. Both the second sidewall rubber t7, adhered to the nose side of the tire carcass, and the second sidewall rubber t8, adhered to the non-nose side of the tire carcass, are directly picked up from the molding back-end equipment of appropriate size and then adhered to the sidewall area using current methods.

[0064] More specifically, the manufacturing method of the above-mentioned nose-type solid tire without imprinting includes the following steps:

[0065] S1. Provide a fetal body, which includes a base portion (t1, t2 and t3), a middle portion t4, a fetal face portion t5, and a nose side and a non-nose side of the fetal body located on both sides of the fetal body axis; the fetal body is a live fetus and is made using existing methods, which will not be described in detail here.

[0066] S2. A first tire sidewall rubber t6 and second tire sidewall rubbers t7 and t8 are provided. Both t6 and t7 / t8 are made of non-marking rubber material. The first tire sidewall rubber t6 is extruded using an extrusion device and then cooled and shaped. It should be noted that the second tire sidewall rubbers t7 and t8, also made of non-marking rubber material, are picked up directly from the extrusion device in the molding backstage and then bonded using existing methods. The first tire sidewall rubber t6, however, is extruded from another extrusion device using a pre-cut die, and then cooled and shaped in a process before being picked up for use. This cooling process can be done by placing it at room temperature or by using cooling water, etc., to cool the first tire sidewall rubber t6 to room temperature; no limitation is made here. Therefore, after the first tire sidewall rubber t6 is cooled, its sidewall rubber can be thinner, its dimensions are stable after cooling, and it is less prone to stretching and deformation during bonding. The second tire sidewall rubbers t7 and t8, however, are in a hot state at a higher temperature, so their sidewall rubber cannot be too thin, as this would easily lead to stretching and deformation.

[0067] S3. Apply a first sidewall rubber t6 to the tire nose side near the radial inner side of the tire, and then apply a second sidewall rubber t7 to the radial outer side of the first sidewall rubber t6, so that the first sidewall rubber t6 and the second sidewall rubber t6 have an overlapping area in the radial direction of the tire, and apply another second sidewall rubber t8 to the tire non-nose side.

[0068] S4. The tire body, after being bonded with the first sidewall rubber t6 and the second sidewall rubbers t7 and t8, is simultaneously vulcanized and finished to produce a nose-type solid tire without imprints. The vulcanization and finishing processes are handled using existing techniques and will not be described in detail here.

[0069] The appearance of the nose-type, non-marking solid tire produced in this embodiment is as follows: Figure 6 As shown in b, compared to Figure 6As shown in the partial cross-sectional view of the prior art tire (a), the nose-type non-marking solid tire manufactured using the above method exhibits minimal material accumulation in the non-marking rubber area of ​​the nose region. The non-marking rubber in the nose region can uniformly cover the nose region with a desired thinness, ensuring the tire's aesthetic appearance. Simultaneously, the non-marking rubber covering the nose region in the intended manner significantly increases the nose's hardness compared to existing technologies, thereby increasing nose rigidity and preventing the risk of the nose detaching from the bead during use. Furthermore, the technology applied in this application was used in batch trials of 200 / 50-10 tires, resulting in a good overall visual appearance with no uneven sidewall color or exposed black areas. Testing and actual assembly showed no reports of the nose detaching from the bead.

[0070] Example 2

[0071] The structure and principle of this embodiment are roughly the same as those of Embodiment 1, and the similarities will not be described in detail here. Figure 3 A schematic diagram of a second embodiment of the tire carcass structure for manufacturing the nose-type solid tire of the present invention is shown. The difference from Embodiment 1 lies in the order in which the first sidewall rubber t6 and the second sidewall rubber t7 are attached to the nose side of the tire carcass. Specifically, a second sidewall rubber t7 is attached to the nose side of the tire carcass near the radially outer side of the tire, and then the first sidewall rubber t6 is attached to the radially inner side of the second sidewall rubber t7. The second sidewall rubber t7 and the first sidewall rubber t6 have a certain overlap area h2 in the radial direction of the tire. The radial height h2 of the overlap area is preferably 2mm to 20mm. When the first sidewall rubber t6 is attached to the nose side of the tire carcass, the radially inner end of the first sidewall rubber t6 should be at least flush with the radially inner end of the nose side of the tire carcass, for example, with... Figure 3 The radial inner end t9 of the base part is flush with or extends beyond the radial inner end t9 of the base part by a certain distance h1, i.e., h1 is preferably 0 to 15 mm.

[0072] Example 3

[0073] The structure and principle of this embodiment are roughly the same as those of Embodiment 1, and the similarities will not be described in detail here. Figure 4 A schematic diagram of a third embodiment of the tire carcass structure for manufacturing the nose-type non-marking solid tire of the present invention is shown. The difference from Embodiment 1 is that the first sidewall rubber t6 and the second sidewall rubber t7, which are attached to the nose side of the tire carcass, are non-marking rubber of the same color, and both are pre-prepared sidewall rubbers extruded from an extrusion device through a pre-formed die and cooled and shaped in a process flow. The second sidewall rubber t7 is composed of two laminated sheets, for example... Figure 4The second sidewall rubber t7 can have the same physical properties and dimensions as the first sidewall rubber t6 (non-marking rubber), or it can have different physical properties and dimensions. For ease of production, this embodiment preferably uses the same physical properties and dimensions as the first sidewall rubber t6 (non-marking rubber). Figure 4 This demonstrates that the second sidewall rubber t7 and the first sidewall rubber t6 are non-marking rubbers with the same physical properties and dimensions. Specifically, the first sidewall rubber t6 is bonded to the radially inner side of the tire nose, and the second sidewall rubber t7, formed by two layers of the first sidewall rubber t6, is bonded to the radially outer side of the tire nose. The radially inner first sidewall rubber t6 and the radially outer layer of the first sidewall rubber t6 form an overlap area h2 of a certain height in the tire's radial direction. The radial height h2 of the overlap area is preferably 2mm to 20mm. The radially inner end of the first sidewall rubber t6 should be at least flush with the radially inner end of the tire nose side, for example, with... Figure 4 The radial inner end t9 of the base portion is flush with or extends beyond the radial inner end t9 of the base portion by a certain distance h1, i.e., h1 is preferably 0-15mm. Another second sidewall rubber t8 is bonded to the non-nose side of the tire carcass. The second sidewall rubber t8 adopts the existing production method for bonding sidewall rubber to solid tires, directly picking up the appropriate size sidewall rubber t8 from the extrusion equipment in the forming backstage and bonding it to the green tire carcass. Of course, the aforementioned second sidewall rubber t7 can also be layered in three or more overlapping or staggered layers according to the tire specifications. In this way, the non-marking rubber in the nose area on the radial inner side of the tire carcass and other areas on the radial outer side is distributed according to the region, and the flow of rubber is controlled. The non-marking solid tire with a nose manufactured using the above method has almost no material accumulation in the non-marking rubber in the nose area; the non-marking rubber in the nose area can uniformly cover the nose area with a relatively thin thickness, ensuring the aesthetic appearance of the tire. Meanwhile, the non-marking rubber covers the nose area in the intended manner, which can significantly improve the hardness of the nose area compared with existing technologies, thereby increasing the rigidity of the nose and avoiding the risk of the nose falling out of the nasal groove during use.

[0074] Example 4

[0075] The structure and principle of this embodiment are roughly the same as those of Embodiment 1, and the similarities will not be described in detail here. Figure 5A schematic diagram of a fourth embodiment of the tire carcass structure for manufacturing the nose-type non-marking solid tire of the present invention is shown. The difference from Embodiment 1 is that the first sidewall rubber t6 and the second sidewall rubber t7, bonded to the nose side of the tire carcass, are non-marking rubbers of the same color but with different physical properties. For example, the hardness of the non-marking rubbers differs; for instance, the hardness of the first sidewall rubber t6 bonded to the nose side of the tire carcass is at least 10 Shore A greater than that of the second sidewall rubber t7. The first sidewall rubber t6 is prepared by pre-extrusion from an extrusion device using a pre-formed die and followed by cooling and shaping in a process flow. The second sidewall rubber t7 is bonded using existing solid tire sidewall rubber bonding production methods, directly picking up an appropriate size from the extrusion device at the forming backstage and bonding it. Another second sidewall rubber t8 is bonded to the non-nose side of the tire carcass using existing solid tire sidewall rubber bonding production methods, directly picking up an appropriate size of sidewall rubber t8 from the extrusion device at the forming backstage and bonding it to the green tire carcass.

[0076] The nose-mounted, non-marking solid tire manufactured using the above method exhibits minimal material buildup in the non-marking rubber area. This rubber can evenly cover the nose area with a desired thinness, ensuring a visually appealing tire appearance. Furthermore, the non-marking rubber's intended coverage of the nose area significantly increases its rigidity compared to existing technologies, thereby preventing the tire from detaching from its groove during use.

[0077] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0078] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0079] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0080] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0081] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0082] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A nose-type solid tire without tire tracks, comprising a base portion and a tread portion, or comprising a base portion, a middle portion and a tread portion, and a first sidewall portion and a second sidewall portion correspondingly disposed on both sides of the tire axial direction, characterized in that, The first tire sidewall has a nose region on its radially inner side, the nose region being used for mounting to the nose groove of the rim; Both the first and second tire sidewalls have an outer non-marking rubber, the non-marking rubber of the first tire sidewall extends from the radially outer side of the tire to the radially inner side of the tire, and the coverage area includes the entire nose area. The non-marking rubber on the first sidewall is formed by vulcanizing a first sidewall rubber located in the nose area and a second sidewall rubber bonded to the first sidewall rubber. The first sidewall rubber and the second sidewall rubber have an overlapping area in the radial direction of the tire, and the first sidewall rubber and the second sidewall rubber are the same color. The non-marking rubber on the second tire sidewall is formed by the vulcanization of the second tire sidewall rubber.

2. The nose-type solid tire with no indentation as described in claim 1, characterized in that, The nose region includes a nasal curve and a nasal mating part, wherein the average thickness of the non-marking rubber in the nasal mating part is ≤2.5mm; and the hardness of the non-marking rubber in the nasal mating part is ≥75Shore A.

3. The nose-type solid tire with no indentation as described in claim 1, characterized in that, The first sidewall rubber is cooled and shaped before vulcanization.

4. The nose-type solid tire with no indentation as described in claim 1, characterized in that, Both the first and second sidewall rubbers are cooled and shaped before vulcanization, and the second sidewall rubber has at least two stacked rubber sheets.

5. The nose-type solid tire with no indentation as described in claim 1, characterized in that, The first sidewall rubber has a higher hardness than the second sidewall rubber.

6. The nose-type solid tire with no indentation as described in claim 5, characterized in that, The hardness difference between the first sidewall rubber and the second sidewall rubber is ≥10 Shore A.

7. The nose-type solid tire with no indentation as described in claim 1, characterized in that, The radial height of the overlapping area is 2mm to 20mm.

8. A method for manufacturing a nose-type solid tire without indentation as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Provide a fetal body, the fetal body including a base portion and a fetal face portion, or including a base portion, a middle portion and a fetal face portion, as well as a nose side and a non-nose side of the fetal body located on both sides of the axial direction of the fetal body. S2. Provide a first tire sidewall rubber and a second tire sidewall rubber, both of which are made of non-marking rubber material, wherein the first tire sidewall rubber is extruded by an extrusion device and then cooled and shaped. S3. The first sidewall adhesive is attached to the tire nose side near the radial inner side of the tire, and a second sidewall adhesive is attached to the tire nose side near the radial outer side of the tire, so that the first sidewall adhesive and the second sidewall adhesive have an overlapping area in the radial direction of the tire, and another second sidewall adhesive is attached to the tire non-nose side. S4. After the first and second sidewall rubbers are bonded together, the tire body is vulcanized and finished to produce a nose-type solid tire without imprints.

9. The manufacturing method as described in claim 8, characterized in that, In step S3, the radial inner end of the first sidewall adhesive extends 0-15 mm beyond the radial inner end of the nose side of the tire body.

10. The manufacturing method as described in claim 8, characterized in that, The cooling and shaping temperature of the first sidewall adhesive is lower than the bonding temperature of the second sidewall adhesive; Alternatively, after the second sidewall rubber is extruded by the extrusion equipment and cooled and shaped, the second sidewall rubber that is attached to the tire nose side near the radial outer side of the tire has at least two stacked rubber sheets. Alternatively, the hardness of the first sidewall rubber may be greater than that of the second sidewall rubber.

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