Solid tire with nose

Abstract

The invention provides a nose type solid tire. The nose type solid tire comprises a base layer part; a plurality of steel wires are distributed at intervals along the axial direction of the tire; the base layer part comprises a bead part, and the bead part is matched with a rim; the bead part comprises a bead nose edge side, a bead non-nose edge side and a bead bottom connected between the bead nose edge side and the bead non-nose edge side; the bead nose edge side comprises a nose edge body area and a nose edge deflection area, and the outline of the nose edge deflection area is formed by an arc line; the axial distance from the axial outer end of the nose edge side of the bead to the central plane of the tire is equal to the axial distance from the axial outer end of the non-nose edge side of the bead to the central plane of the tire; the bead bottom at least comprises a bead bottom first area, a bead bottom second area and a bead bottom third area, and an inner diameter difference exists between the bead bottom first area and the bead bottom second area; the radial outer side of the third area of the bead bottom is not provided with steel wires; the axial distances of the plurality of steel wires arranged at the bottom of the bead are unequal; the steel wires on the nose edge side of the bead are arranged in a manner of deviating to the center of the tire.

Description

Technical Field

[0001] The invention relates to the technical field of tires, and in particular to a nose-type solid tire. Background Art

[0002] Existing solid tires include press-fit solid tires and pneumatic tire rim solid tires. The press-fit solid tire and pneumatic tire rim solid tire have different tire installation methods. The former uses a hammer-type press-in and interference fit with the axle to fix the tire on the axle, while the latter uses a one-piece or multi-piece rim to install and then fix it to the axle.

[0003] In addition, solid tires can be divided into split solid tires and nose solid tires according to the structure of the tire lip. For pneumatic tire rim solid tires, split solid tires are often equipped with a multi-piece rim, and the tire lip is symmetrically arranged, that is, the center line of the tire crown coincides with the center line of the tire lip, and the steel wire of the tire lip is symmetrically arranged with the center line of the tire crown; nose solid tires are equipped with a simple one-piece rim, and the tire lip part of the nose solid tire is asymmetrically arranged, that is, the center line of the tire crown does not coincide with the center line of the axial width of the tire lip, or the steel wire of the tire lip is asymmetrically arranged with the center line of the tire crown.

[0004] Nose-type solid tires have great advantages because they use a one-piece rim with simple configuration, which reduces the number of rim accessories and reduces the cost. At the same time, they have low difficulty in tire installation and high efficiency. However, there are still some problems in the installation process of nose-type solid tires. At present, the one-piece rims configured for nose-type solid tires generally adopt the universal rims specified in the ETRTO standard. There is a step on the bottom surface where the rim and the tire bead match, and there is a difference in the inner diameter of the bottom surface of the rim on both sides of the step. The inner diameter of the guide component of the tire installation mechanism suddenly decreases when passing through the rim step. Therefore, the nose-type solid tire is easily stuck during assembly, making it difficult to install the tire, resulting in the problem of bruises at the step on the inner diameter of the bead (such as Figure 1 Secondly, during the installation process of the solid tire with nose, the bead nose may not be properly assembled and partially fall out (such as Figure 2 As shown in the figure, the problem of partial detachment of the tire lip nose makes it difficult to squeeze the nose back into the rim nose groove by local squeezing. These tire installation problems of nose-type solid tires will affect the normal use of the tires.

[0005] The prior art discloses some solutions to some assembly problems that occur during the assembly of nose-type solid tires. The patent with publication number CN203126404U discloses a nose-type solid tire with bead, in which the wire rings located at the two outer edges of the tire are arranged at unequal distances from the left and right edges of the bead, and the distance at one end of the bead with the nose is greater than the distance at the other end of the bead, while the wire rings located in the middle are spaced at equal or unequal intervals. The patented technology has made certain improvements in tire assembly performance, but it does not address the problem of easy crushing at the bead inner diameter step due to the objective existence of the rim mating surface step and the solution to the partial inadequate assembly of the nose.

[0006] The patent with the publication number of JP3728666B2 discloses a wheel, including a rim, a solid carcass with a tread rubber layer and a base rubber layer with a bead core arranged on the rim, the rim is provided with a rim flange on one side, and a groove is provided on the rim. On the other side, the tire bottom is provided with a convex block to match the groove, wherein the height of the base rubber layer is set to 20%-70% of the tire height; the tensile stress of the base rubber layer at 10% elongation is 1.5MPa-5MPa, and the radial / axial matching margin is further limited; the patented technology makes certain optimizations to the rubber material properties of the base rubber layer, and at the same time limits the inner circumference of the bead core of the base rubber layer and the total width of the bead core, but does not involve the relevant technical enlightenment of the influence of the rim step on the tire assembly process.

[0007] The patent with publication number JP7424024B2 discloses a solid tire and wheel, in which the protrusion of the tire includes an outer rubber part arranged on the outer side of the protrusion and an inner rubber part arranged on the inner side of the outer rubber part and having different rubber properties from the outer rubber part; at the same time, the rubber hardness of the protrusion is further limited. The patented technology makes certain improvements in the rubber material of the protrusion, but still does not involve the objective influence of the rim step on the tire assembly process; at the same time, the patented technology is aimed at optimizing the protrusion under use conditions such as sharp turns and high loads, and does not involve the improvement of the problem of improper assembly of the protrusion during the tire installation process before the tire is used.

[0008] The patent with publication number JP7099114B2 discloses a wheel having a rim and a solid tire mounted on the rim, wherein the solid tire has convex strips embedded in the rim grooves, and in the cross section perpendicular to the circumferential direction, the cross-sectional area of ​​the convex strips is not less than 110% and not more than 120% of the area of ​​the rim groove; at the same time, the hardness of the tire base is limited; the patented technology optimizes the convex strips and rim grooves of the tire to facilitate wheel flange assembly, but the rim is of a special form and does not involve relevant technical inspiration on the influence of steps on the tire assembly process when using the universal rim specified in the ETRTO standard.

[0009] Therefore, the assembly problems that are prone to occur when nose-type solid tires are assembled with universal rims specified in the ETRTO standard are still worthy of further in-depth research and resolution, in order to further improve the assembly performance of nose-type solid tires. Summary of the invention

[0010] In order to solve the above technical problems, the present invention provides a nose-type solid tire, which can solve the tire installation problems such as the inner side of the tire lip being crushed during the tire installation process of the nose-type solid tire and the nose being partially dislocated due to improper assembly, thereby improving the tire installation performance of the nose-type solid tire and ensuring the normal use performance of the tire.

[0011] In order to solve the above technical problems, the present invention provides a nose-type solid tire, which includes a tread portion and a base portion; the tread portion is provided with a tread pattern, and the base portion is provided with a plurality of steel wires spaced apart along the axial direction of the tire; the base portion includes a tire lip portion, and the tire lip portion cooperates with the rim;

[0012] The tire lip portion includes a tire lip nose edge side and a tire lip non-nose edge side, and a tire lip bottom connected between the tire lip nose edge side and the tire lip non-nose edge side;

[0013] The tire lip nose edge side includes a nose edge body area and a nose edge bending area, and the contour of the nose edge bending area is composed of an arc line;

[0014] The axial distance between the axial outer end of the bead nose side and the tire center plane is equal to the axial distance between the axial outer end of the bead non-nose side and the tire center plane;

[0015] The tire lip bottom includes at least a first tire lip bottom area, a second tire lip bottom area, and a third tire lip bottom area, and there is an inner diameter difference between the first tire lip bottom area and the second tire lip bottom area;

[0016] There is no steel wire arranged radially outside the third zone at the bottom of the tire lip; the axial spacing of the several steel wires arranged at the bottom of the tire lip is not equal; the steel wires at the nose edge side of the tire lip are arranged in a manner biased towards the center of the tire.

[0017] In a preferred embodiment, the radius of curvature of the arc of the nose edge bending zone is r, 8mm<r<25mm.

[0018] In a preferred embodiment, the arc line of the nose edge bending zone is a concave arc, and the concave arc is arranged to be concave toward the center of the tire.

[0019] In a preferred embodiment, the curvature radius r of the concave arc is set in the range of 12mm≤r≤18mm.

[0020] In a preferred embodiment, the arc of the nose edge bending zone is composed of two concave arcs connected together.

[0021] In a preferred embodiment, the nose edge main body area extends radially inward from the axial terminal end of the second area at the bottom of the tire lip to form a protruding part, and extends to the starting end of the contour arc of the nose edge bending area; the starting end of the contour arc of the nose edge bending area is connected to the nose edge main body area.

[0022] In a preferred embodiment, the nose edge body area includes a nose edge straight portion; the radial distance from the radial outer end of the nose edge straight portion to the end face of the rim nose groove is set to 0mm-8mm.

[0023] In a preferred embodiment, the axial distance from the first steel wire on the bead nose edge side close to the tire center plane to the tire center plane is W. 1 The axial distance from the first steel wire on the non-nose edge side of the tire lip close to the tire center plane to the tire center plane is W 2 ; said W 1 <W 2 .

[0024] In a preferred embodiment, the first strand of steel wire on the bead nose edge side close to the tire center plane is arranged in a manner biased toward the tire center.

[0025] In a preferred embodiment, the axial distance between the first steel wire and the second steel wire closest to the tire center plane on the bead nose edge side is W. 3 The axial width of the third zone at the bottom of the tire lip is d 1 , the W 3 =(2-3)d 1 .

[0026] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0027] 1. The present invention provides a nose-type solid tire, wherein the tire lip portion has a tire lip nose edge side and a tire lip non-nose edge side, and the tire lip nose edge side has a nose edge body area and a nose edge bending area; the contour of the nose edge bending area is composed of arcs. Since the deformation of the nose edge body area during tire assembly is not a completely independent deformation, the deformation of the nose edge body area will be linked to the nose edge bending area radially outside the nose edge body area; and in the present invention, the contour of the nose edge bending area is composed of arcs, and the arc is a concave arc design; the radius of curvature of the arc is greater than 8mm and less than 25mm. Through this optimized design, the nose edge bending area provides a suitable rebound space for the deformation of the nose edge body area. In this way, the nose edge body area has sufficient rigidity to deform and sufficient elasticity to resist deformation. The nose edge body area can rebound quickly and snap into the rim nose groove after the external force of tire installation is removed, ensuring that the tire lip nose edge side can be evenly snapped into the rim nose groove to ensure correct tire installation.

[0028] 2. Due to the objective difference in inner diameter of the third zone at the bottom of the bead, the inner diameter of the second zone at the bottom of the bead is smaller than that of the first zone at the bottom of the bead; when the rim passes through the third zone at the bottom of the bead during tire assembly, it will cause interference in tire installation to a certain extent. By setting no steel wire on the radial outer side of the third zone at the bottom of the bead, the third zone of the bead is prevented from being too rigid and causing local damage to the bottom of the bead, ensuring correct tire installation. At the same time, the axial distance from the axial outer end of the bead nose side of the bead to the tire center plane is equal to the axial distance from the axial outer end of the non-bead nose side of the bead to the tire center plane, that is, the axial width of the bead adopts a symmetrical design, and the steel wires on the bead nose side are arranged in a manner biased towards the center of the tire, shortening the steel wire spacing on the bead nose side, and preventing the bead nose side from weakening rigidity. In this way, the comprehensive rigidity of the bead nose side area is taken into account; the bottom of the tire bead is ensured to tighten the rim, avoid the risk of slipping, and ensure the tire installation performance of the nose-type solid tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of a crush injury at a bead inner diameter step during tire assembly in the prior art;

[0030] Figure 2 A schematic diagram of a tire lip nose being partially dislocated due to improper assembly during tire assembly in the prior art;

[0031] Figure 3 It is a schematic cross-sectional structural diagram of a nose-type solid tire and a rim in an assembled state in a preferred embodiment of the present invention;

[0032] Figure 4 for Figure 1 Schematic diagram of the partially enlarged cross-sectional structure. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In order to clearly describe the nose-type solid tire structure of this embodiment, the orientation of the tire is first defined. The tire has a rotation center and a tire center plane CL. The direction around the tire rotation center is defined as the tire circumferential direction, the direction parallel to the tire rotation center along the tire section width is defined as the tire axial direction, the direction close to the tire center plane CL is defined as the axial inside, and the direction away from the tire center plane CL is defined as the axial outside; the direction perpendicular to the tire rotation center along the tire section height is defined as the tire radial direction, the direction close to the tire rotation center is defined as the radial inside, and the direction away from the tire rotation center is defined as the radial outside; the cross-sectional structure diagrams of the nose-type solid tire shown in Figures 3-4 of this embodiment should be understood as schematic diagrams.

[0037] Figure 3-Figure 4 The cross-sectional structural schematic diagram and the partially enlarged structural schematic diagram of the nose-type solid tire of this embodiment in the assembled state with the rim are shown, wherein the rim is a universal rim specified in the ETRTO standard. A nose-type solid tire T has a tread portion 1, a middle layer portion 2 and a base layer portion 3. The tread portion 1 contacts the ground and is provided with a tread pattern; the base layer portion 3 has a tire lip portion, which cooperates with the rim R, and the base layer portion 3 is provided with steel wires 33, which are arranged at intervals along the axial direction of the tire. The middle layer portion 2 is located between the tread portion 1 and the base layer portion 3, and mainly plays a buffering and transitional role. For some forms of solid tires, the middle layer 2 is not necessary, that is, in the cross-sectional structural state of the tire, the tire has a tread portion 1 and a base layer portion 3 but no middle layer portion 2.

[0038] The base portion 3 has a bead portion, which cooperates with the rim R; the bead portion has a bead non-nose edge side 31, a bead nose edge side 32, and a bead bottom 34 connected between the bead non-nose edge side 31 and the bead nose edge side 32. The bead bottom 34 has at least a bead bottom first area 341, a bead bottom second area 342, and a bead bottom third area 343. The bead bottom first area 341 and the bead bottom second area 342 have an inner diameter difference in the tire radial direction. Figure 3 As shown, the radius difference between the first area 341 at the bottom of the bead and the second area 342 at the bottom of the bead in the radial direction of the tire is d 2The difference in width between the first area 341 at the bottom of the bead and the second area 342 at the bottom of the bead in the axial direction of the tire is d 1 The difference between the first area 341 at the bottom of the bead and the second area 342 at the bead portion in the radial direction and the axial direction of the tire is d 1 With d 2 The formed difference area constitutes the tire lip bottom third area 343. The axial outer side of the tire lip bottom second area 342 is connected to the tire lip nose edge side 32.

[0039] The bead nose edge side 32 has a bead nose edge body area 321 and a bead nose edge bending area 322. The bead nose edge body area 321 is formed by the axial terminal A of the second area 342 of the bead bottom extending radially inward to form a protruding part and terminating at the area of ​​the radially outer terminal B of the bead, and the terminal B here is also the starting end B of the contour arc of the nose edge bending area 322. The bead nose edge bending area 322 is connected to the bead nose edge body area 321 and extends radially outward of the tire and terminates at the terminal C of the sidewall portion 21, and the terminal C here is also the terminal end C of the contour arc of the nose edge bending area 322.

[0040] During the tire installation process of the solid tire with a nose, the nose edge body area 321 of the lip nose edge side 32 gradually deforms under the support of the guiding component of the tire installation mechanism, and while the nose edge body area 321 of the lip nose edge side 32 deforms, the local area of ​​the nose edge bending area 322 will be linked to participate in the deformation; when the guiding component of the tire installation mechanism gradually moves toward the axially outer side of the lip nose edge 32 to the radially inner lowest point of the nose edge body area 321, the nose edge body area 321 of the lip nose edge side 32 and the nose edge bending area 322 are simultaneously linked to reach the deformation limit; at the moment when the guiding component of the tire installation mechanism passes the radially inner lowest point of the nose edge body area 321, the nose edge body area 321 instantly rebounds and is stuck in the nose groove corresponding to the rim, completing the installation process of the solid tire with a nose. It is under the action of the linked deformation of the nose lip flexure area 322 that the nose lip body area 321 is provided with space for deformation and rebound. When the external force for tire installation is removed, the nose lip body area 321 can rebound quickly and evenly fit into the rim nose groove, ensuring that the lip nose lip side 32 can be evenly inserted into the rim nose groove, completing the normal tire installation of the nose-type solid tire.

[0041] The contour of the nose edge bending area 322 of the tire lip nose edge side 32 is at least composed of an arc, and the curvature radius r of the arc is greater than 8mm. If the curvature radius r of the arc constituting the nose edge bending area 322 is too small, the linkage effect of the nose edge bending area 322 is weakened, thereby weakening the overall rigidity of the tire lip nose edge side 32, resulting in a decrease in the deformation resilience performance of the nose edge body area 321. When the external force of tire installation is removed, the instantaneous resilience performance of the nose edge body area 321 is insufficient and cannot be evenly and forcefully inserted into the rim nose groove; thus, the tire lip nose edge is partially disengaged.

[0042] like Figure 4 As shown, combined Figure 3 , assuming that the starting end B and the ending end C are connected to form a virtual straight line BC, then the contour of the nose edge bending area 322 is composed of the virtual straight line BC. If in this case, during the tire installation process, the overall rigidity of the area on the nose edge side 32 of the tire lip is too large, the linkage effect of the nose edge bending area 322 connected to the nose edge body area 321 is too strong, making it difficult for the nose edge body area 321 to be inserted into the rim nose groove; the nose edge body area 321 may even be damaged, resulting in abnormal tire installation. Based on this understanding, the contour of the nose edge bending area 322 on the nose edge side 32 of the tire lip is composed of at least one arc, and it is appropriate for the curvature radius r of the arc to be less than 25 mm. If the curvature radius r of the contour arc of the nose edge bending area 322 is too large, the linkage effect of the nose edge bending area 322 is abnormally strengthened, thereby excessively enhancing the overall rigidity of the bead nose edge side 32, resulting in a decrease in the deformation ability of the nose edge body area 321 and insufficient rebound space, making it difficult for the nose edge body area 321 to fit into the rim nose groove, which will cause abnormal installation of the nose-type solid tire. Therefore, it is appropriate to set the curvature radius of the arc of the nose edge bending area 322 in the range of 8mm<r<25mm.

[0043] Based on the tire installation characteristics of the nose-type solid tire, the contour of the nose flexure area 322 of the lip nose side 32 is preferably an arc, and the arc is concave toward the center of the tire; further, the curvature radius r of the concave arc is preferably greater than or equal to 12 mm and less than or equal to 18 mm, so that the linkage effect of the nose flexure area 322 on the nose body area 321 is exerted, and the deformation rebound space of the nose body area 321 is ensured, so that the nose body area 321 can be evenly stuck in the rim nose groove, while taking into account the overall rigidity of the lip nose side 32 to ensure correct tire installation.

[0044] like Figure 4As shown, on the bead nose edge side 32 of the nose-type solid tire, the area where the nose edge body area 321 cooperates with the axial outer side of the nose groove of the rim is the nose edge straight part 321a, and the radial outer end of the nose edge straight part 321a ends at the starting end B of the contour arc of the nose edge bending area 322. The radial distance h from the radial outer end B of the nose edge straight part 321a to the end face D of the rim nose groove is set to 0mm-8mm. If the radial distance h from the radial outer end B of the nose edge straight part 321a to the end face D of the rim nose groove is too large, the rigidity of the nose edge body area 321 is too large; the linkage rebound space of the nose edge bending area 322 is insufficient, which is not conducive to the smooth insertion of the nose edge body area 321 into the rim nose groove, and is not conducive to the installation of the nose-type solid tire. On the contrary, if the radial distance h from the radially outer end B of the nose edge straight portion 321a to the end face D of the rim nose groove is less than 0mm, that is, the nose edge straight portion 321a is lower than the end face D of the rim nose groove, the overall rigidity of the nose edge body area 321 is insufficient and it cannot be evenly inserted into the rim nose groove, which is not conducive to the installation of the nose-type solid tire and will cause the tire lip of the nose-type solid tire and the rim to slide against each other. Therefore, it is appropriate to set h at 0mm-8mm.

[0045] like Figure 3 As shown in the figure, when the nose-type solid tire is installed with the universal rim specified in the ETRTO standard, there is an objective inner diameter difference d in the third area 343 at the bottom of the tire lip. 2 , the inner diameter of the second area 342 at the bottom of the bead is smaller than the first area 341 at the bottom of the bead; during the tire assembly process, when the rim passes through the third area 343 at the bottom of the bead, tire installation interference will occur to a certain extent. Preferably, no steel wire is set on the radial outer side of the third area 343 at the bottom of the bead to avoid excessive rigidity of the third area 343 at the bottom of the bead, increase tire installation interference and cause local damage to the bottom of the bead, ensure correct tire installation, and improve the tire installation performance of the nose-type solid tire.

[0046] In order to ensure the tire installation performance of the nose-type solid tire, the bead nose edge side 32 can be evenly matched with the rim nose groove, and the bead bottom 34 can smoothly fit with the rim R to avoid tire installation interference. No steel wire is arranged on the radial outer side of the third area 343 of the bead bottom, and the axial distances between the several steel wires 33 arranged at the bead bottom 34 are not equal. Figure 3 As shown, taking the tire bead bottom 34 as an example, an even number of 4 steel wires are arranged, which are steel wires 331, 332, 333 and 334. Taking the tire center plane CL as a reference, the distance from the first steel wire 333 located at the tire bead nose edge side 32 closest to the tire center plane CL to the tire center plane CL is W 1 The distance from the first steel wire 332 located on the non-bead nose edge side 31 closest to the tire center plane CL to the tire center plane CL is W 2 , W 1 <W 2That is, the axial distances of the steel wires arranged at the bottom 34 of the bead are not equal, but at the same time, the first steel wire 333 located at the bead nose edge side 32 closest to the tire center plane CL is arranged in a manner biased toward the tire center, ensuring that no steel wire is arranged radially outside the third area 343 of the bead bottom, avoiding excessive rigidity of the third area 343 of the bead bottom, causing tire installation interference and causing local damage to the bead bottom, and ensuring correct tire installation.

[0047] At the same time, in order to prevent the steel wires on the bead nose edge side 32 from being concentrated toward the tire center, the axial distance W between the second steel wire 334 closest to the tire center plane CL on the bead nose edge side 32 and the first steel wire 333 closest to the tire center plane CL is 3 The axial width d of the third zone 343 at the bottom of the tire lip 1 In this way, the overall rigidity of the bead nose edge side 32 can be balanced, which facilitates tire installation and prevents the tire bead and the rim from slipping against each other, thereby improving the tire installation performance of the nose-type solid tire.

[0048] Furthermore, in order to avoid local damage of the tire caused by tire installation interference and to balance the overall rigidity of the tire base portion 3, the axial distance from the axial outer end of the non-nose edge side 31 of the bead to the tire center plane CL is W 4 The axial distance from the axial outer end of the bead nose edge side 32 to the tire center plane CL is also W 4 That is, the axial distance from the axial outer end of the non-nose edge side 31 of the bead to the tire center plane CL is equal to the axial distance from the axial outer end of the bead nose edge side 32 of the bead to the tire center plane CL. In this way, the bead part of the base portion 3 adopts a symmetrical design, that is, the center plane CL of the tire coincides with the center line of the axial width of the bead part. At the same time, the steel wires of the bead nose edge side 32 are arranged in a manner biased toward the center of the tire, shortening the steel wire spacing of the bead nose edge side 32 to prevent the rigidity of the bead nose edge side 32 from weakening. In this way, the bottom 34 of the tire bead is ensured to tighten the rim, avoid the risk of slipping, and ensure the tire installation performance of the nose-type solid tire.

[0049] This embodiment Figure 3-Figure 4 The outline of the nose flexure area 322 of the nose edge side 32 of the lip of the solid tire with nose shown is set by a single concave arc; in some cases, the outline of the nose flexure area 322 of the nose edge side 32 of the lip can also be composed of two concave arcs connected; the nose flexure area 322 is formed by the reasonable connection of the two concave arcs, which can also play a linkage effect in the tire installation process, provide a rebound space for the deformation of the nose body area 321, so that the nose body area 321 can be evenly stuck in the rim nose groove, thereby completing the normal tire installation of the solid tire with nose.

[0050] The technical solution provided in this embodiment is applied to two nose-type solid tire specifications, 6.00-9 and 140 / 55-9. No abnormality was found in the tire performance test in the factory. At the same time, it was put into use for tire installation on actual vehicles at customer sites. Customers evaluated that there were no abnormalities in the tire installation performance and use.

[0051] The technical solution provided in this embodiment can solve the tire installation problems such as the inner side of the tire lip being crushed during the installation process of the nose-type solid tire and the partial dislocation of the nose due to improper assembly, thereby improving the tire installation performance of the nose-type solid tire and ensuring the normal performance of the tire.

[0052] The above is only a preferred specific implementation of the present invention, but the design concept of the present invention is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the present invention within the technical scope disclosed by the present invention shall be deemed to infringe the protection scope of the present invention.

Claims

1. A nose-type solid tire, the tire comprising a tread portion and a base portion; the tread portion is provided with a tread pattern, and the base portion is provided with a plurality of steel wires spaced apart along the axial direction of the tire; characterized in that: The base layer includes a tire lip portion, and the tire lip portion cooperates with the rim; The tire lip portion includes a tire lip nose edge side and a tire lip non-nose edge side, and a tire lip bottom connected between the tire lip nose edge side and the tire lip non-nose edge side; The tire lip nose edge side includes a nose edge body area and a nose edge bending area, and the contour of the nose edge bending area is composed of an arc line; The axial distance between the axial outer end of the bead nose side and the tire center plane is equal to the axial distance between the axial outer end of the bead non-nose side and the tire center plane; The tire lip bottom includes at least a first tire lip bottom area, a second tire lip bottom area, and a third tire lip bottom area, and there is an inner diameter difference between the first tire lip bottom area and the second tire lip bottom area; There is no steel wire arranged radially outside the third zone at the bottom of the tire lip; the axial spacing of the plurality of steel wires arranged at the bottom of the tire lip is unequal; the steel wires at the nose edge side of the tire lip are arranged in a manner biased toward the center of the tire.

2. A nose-type solid tire according to claim 1, characterized in that: The radius of curvature of the arc of the nose edge bending zone is r, 8mm<r<25mm.

3. A nose-type solid tire according to claim 2, characterized in that: The arc line of the nose edge bending zone is a concave arc, and the concave arc is arranged to be concave toward the center of the tire.

4. A nose-type solid tire according to claim 3, characterized in that: The curvature radius r of the concave arc is set in the range of 12mm≤r≤18mm.

5. A nose-type solid tire according to claim 1, characterized in that: The arc line of the nose edge bending zone is composed of two concave arcs connected together.

6. A nose-type solid tire according to claim 1, characterized in that: The nose edge main body area extends radially inward from the axial terminal end of the second area of ​​the tire lip bottom to form a protruding part, and extends to terminate at the starting end of the contour arc of the nose edge bending area; the starting end of the contour arc of the nose edge bending area is connected to the nose edge main body area.

7. A nose-type solid tire according to claim 6, characterized in that: The nose edge body area includes a nose edge straight portion; the radial distance from the radial outer end of the nose edge straight portion to the end face of the rim nose groove is set to 0mm-8mm.

8. A nose-type solid tire according to claim 1, characterized in that: The axial distance from the first steel wire on the bead nose side close to the tire center plane to the tire center plane is W1, and the axial distance from the first steel wire on the bead non-nose side close to the tire center plane to the tire center plane is W2; W1<W2.

9. A nose-type solid tire according to claim 8, characterized in that: The first strand of steel wire on the tire lip nose edge side close to the tire center plane is arranged in a manner biased toward the tire center.

10. A nose-type solid tire according to claim 9, characterized in that: The axial distance between the first steel wire and the second steel wire on the bead nose edge side closest to the tire center plane is W3, the axial width of the third zone at the bead bottom is d1, and W3=(2-3)d1.

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