Off-the-road tire
By designing the end point of the reverse carcass in the construction machinery tires to extend above the horizontal axis and fill the glue, the problem of easy damage in the sidewall area in harsh environments is solved, and the tire's anti-flexural performance and durability are improved. Extend service life.
Patent Information
- Application Number
- CN202411632024.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-01-10
AI Technical Summary
The existing construction machinery tires are prone to damage in harsh environments, resulting in the reverse carcass being subjected to large lateral force and compression stress, resulting in the steel wire breakage, reducing durability and service life.
Design a construction machinery tire that includes the main body carcass and the reverse carcass. The end point of the reverse carcass extends above the horizontal axis, and fills the filler between the reverse carcass and the main carcass, and optimizes the filler structure to reduce the The compression stress of the carcass is reversed to improve the tire's resistance to flexure and durability.
By optimizing the sidewall profile and structure, the compression stress of the reverse carcass is reduced, the service life of the tire is extended, the anti-flexural performance is improved, the wire is avoided, and the overall durability of the tire is improved.
Smart Images
Figure CN119283535A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of tires, and in particular to a tire for engineering machinery. Background Art
[0002] The use environment of engineering machinery tires is in the mine, the driving speed is slow, but the road conditions are bad, there are many gravel blocks, uneven, there are many ups and downs, and the vehicle has a large load. In view of the above use environment, in order to improve the bending and puncture resistance of the sidewall area of the engineering machinery tire, the existing engineering machinery tires basically adopt the design of high-turn-up carcass.
[0003] Compared with the shoulder area and the bead area, although the high-turned carcass design improves the flexural resistance of the sidewall area, the sidewall area will still produce large deformation under harsh operating conditions. Moreover, due to repeated extrusion and stretching, the turned-up carcass in the sidewall area is subjected to not only radial force but also large lateral force and compressive stress. After the turned-up carcass is repeatedly subjected to large compressive stress, the carcass steel wire will break, reducing the durability of the engineering machinery tire and shortening its service life. Summary of the invention
[0004] In view of the problem that the sidewalls of existing engineering machinery tires are easily damaged during use, resulting in a reduced service life, the present invention provides an engineering machinery tire.
[0005] The technical solution of the present invention provides an engineering machinery tire, comprising a carcass, a wire bead and a filling rubber, wherein the carcass comprises a main carcass and an inverted carcass; at the tire toe, the main carcass passes around the wire bead to form an inverted carcass extending in the opposite direction, and the main carcass and the inverted carcass wrap the wire bead around the tire toe; and the filling rubber is filled between the inverted carcass and the main carcass; The end point of the turned-up carcass shall not be lower than the horizontal axis of the engineering machinery tire.
[0006] Preferably, the filling rubber includes a lower filling rubber and an upper filling rubber; the lower filling rubber is located on the upper layer of the wire ring between the turned-up carcass and the main carcass and contacts the wire ring, and the cross section of the lower filling rubber extends and shrinks to the surface of the main carcass 6.1 to form a substantially triangular cross section; The upper filling rubber is formed on the upper layer of the lower apex rubber between the turned-up carcass and the main carcass, the upper filling rubber contacts the surface of the lower apex rubber at the bottom, and terminates at the main carcass surface above the end point of the turned-up carcass.
[0007] Preferably, with respect to the upper filling rubber 7.1, the thickness of the tire bead filling rubber 7 close to the horizontal axis X is set to Ha, and the distance from the turned-up carcass 6.2 at the position corresponding to Ha to the horizontal axis X is set to LA, 0.069≤LA / LSH≤0.18; the thickness of the tire bead filling rubber 7 close to the wire ring 8 is set to Hb, and the distance from the turned-up carcass 6.2 at the position corresponding to Hb to the horizontal axis X is set to LB, 0.37≤LB / LSH≤0.65, and the thickness of the tire bead filling rubber 7 Ha:Hb=1.
[0008] Preferably, a shoulder pad is included, and the shoulder pad can partially cover the outer surface of the upper filling rubber.
[0009] Preferably, the compression strain range of the carcass is 1.51% to 2.53%; and the modulus range of the lower filling rubber is 3.47Mpa≤E'≤6.30Mpa.
[0010] Preferably, the ratio of the section width SW to the section height SH is SW / SH=1.047, and the ratio of the distance LSH from the horizontal axis to the rim centerline to the section height is LSH / SH=0.5.
[0011] The present invention improves the tire performance by optimizing the sidewall profile and structure of the engineering machinery tire. Through the study of the turn-up technology, the turn-up endpoint is extended above the horizontal axis. It further involves structural improvements to the filling rubber to reduce the compressive stress of the turn-up tire body, thereby improving the tire durability and extending the tire service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a cross-sectional schematic diagram of the engineering machinery tire of the present invention; Figure 2 It is an enlarged schematic diagram of a part of the sidewall of the engineering machinery tire of the present invention. DETAILED DESCRIPTION
[0013] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. In this specification, the size ratios in the drawings do not represent the actual size ratios, but are only used to reflect the relative position relationship and connection relationship between the components. Components with the same name or the same number represent similar or identical structures and are only for illustrative purposes.
[0014] In order to improve the stress of the turned-up carcass after loading, the engineering machinery tire of the present invention adopts a high turned-up carcass design, and on this basis, optimizes the design of the turned-up carcass and the filling rubber between the turned-up carcass and the main carcass. Figure 1 As shown, the engineering machinery tire of the present invention comprises a tread 1, a belt layer 2, a shoulder pad 3, an inner liner 4, a sidewall 5, a carcass 6, a bead filling rubber 7, and a wire ring 8.
[0015] At the tire toe, the main carcass 6.1 passes around the wire bead to form an inverted carcass 6.2 extending in the opposite direction along the sidewall. The main carcass 6.1 and the inverted carcass 6.2 wrap the wire bead 8 around the tire toe. Filling rubber 7 is filled between the inverted carcass 6.2 and the main carcass 6.1. In the tire structure, the horizontal axis is defined by the line connecting the widest axial part of the section, and the center axis of the section is defined by the radial plane at the axial center of the tire. In order to optimize the force of the inverted carcass, the end point of the inverted carcass 6.2 should not be lower than the horizontal axis to improve the flexural performance of the sidewall and ensure the load-bearing capacity of the tire.
[0016] The deformation and bending characteristics of the tire sidewall are improved by filling the filling rubber between the turned-up carcass 6.2 and the main carcass 6.1. At the same time, the filling rubber also affects the deformation and stress of the turned-up carcass 6.2. In order to improve the stress of the turned-up carcass, The turned-up carcass 6.2 is connected to the main carcass 6.1 through a wire ring 4, and is turned up from the inside to the outside in the transverse direction of the tire. The turned-up carcass 6.2 extends upward in the radial direction of the tire. The end point P of the turned-up carcass 6.2 is higher than the horizontal axis X, which is the horizontal line at the widest part of the tire. The horizontal axis X intersects with the sidewall 5, and the distance between the intersections is set as the section width SW. The tire height is the distance from the tread 1 to the rim and the baseline, which is set as SH, SW / SH=1.047, the distance from the horizontal axis to the rim and the line is set as LSH, the section height is set as SH, LSH / SH=0.5, and the height from the end point P of the turned-up carcass to the rim and the baseline is set as H, H / SH=1.05 The filling rubber is arranged in layers in the technical solution of the present invention, mainly including the lower filling rubber 7.2 and the upper filling rubber 7.1. The lower filling rubber is located in the upper layer of the wire ring between the turned-up carcass 6.2 and the main carcass 6.1 and contacts the wire ring. The cross section of the lower filling rubber extends and contracts to the surface of the main carcass 6.1 to form a roughly triangular cross section. The upper filling rubber 7.1 is formed on the upper layer of the lower apex rubber between the turned-up carcass 6.2 and the main carcass 6.1. The lower part of the upper filling rubber 7.1 contacts the surface of the lower apex rubber 7.2, and the upper part terminates at the surface of the main carcass 6.1 above the end point of the turned-up carcass 6.2. Therefore, the upper filling rubber 7.1 completely isolates the direct contact between the turned-up carcass and the main carcass, which avoids the direct influence of the deformation of the main carcass on the turned-up carcass, thereby improving the stress condition of the turned-up carcass. As for the upper filling rubber 7.1, the thickness of the tire bead filling rubber 7 close to the horizontal axis X is set to Ha, the distance from the turned-up carcass 6.2 at the position corresponding to Ha to the horizontal axis X is set to LA, 0.069≤LA / LSH≤0.18; the thickness of the tire bead filling rubber 7 close to the wire ring 8 is set to Hb, the distance from the turned-up carcass 6.2 at the position corresponding to Hb to the horizontal axis X is set to LB, 0.37≤LB / LSH≤0.65, the thickness of the tire bead filling rubber 7 Ha:Hb=1, within a certain range, when the thickness of the tire bead filling rubber 7 is the same, the turned-up carcass and the main carcass remain parallel, which can reduce the compressive stress on the turned-up carcass, avoid the breakage of the carcass steel wire, and improve durability.
[0017] Under the condition that other properties are equivalent, the carcass 6 is made of a material with small compressive strain. The smaller the compressive strain, the smaller the deformation of the material under pressure. The compressive strain range is 1.51%~2.53%; The upper bead filling rubber 7.1 arranged between the main carcass 6.1 and the turned-up carcass 6.2 improves the rigidity and supporting force and enhances the ability of the turned-up carcass to resist compressive stress while ensuring other performances. The rigidity of the bead filling rubber 7 is represented by the modulus E'. The modulus of the upper bead filling rubber 7.1 is matched with that of the carcass 6 and the lower bead filling rubber 7.2, 3.47Mpa≤E'≤6.30Mpa.
[0018] The above technical solution provides the embodiments in the following table and the corresponding comparative examples for simulation experiments. The tire specifications of these embodiments are the same, the ratio of the section width SW to the section height SH is SW / SH=1.047, and the ratio of the distance LSH from the horizontal axis to the rim line to the section height is LSH / SH=0.5.
[0019] In the results in the table, "-" indicates compressive stress, and the smaller the "-" value, the smaller the compressive stress; "+" indicates tensile stress. For the carcass steel cord, its compression resistance is weak. When the stress value is the same, if it is compressive stress, the steel wire is easier to break, and if it is tensile stress, the steel wire has little deformation and is not easy to break. Therefore, the present invention is intended to reduce the compressive stress on the carcass and convert it into tensile stress, so as to avoid the steel wire from breaking when it is subjected to a smaller compressive stress, reduce durability, and reduce the service life of the tire. Compared with the traditional example and embodiments 1 to 2, the present invention controls the contour trend of the main carcass and the turn-up carcass between point a and point b in terms of material distribution. When the contours of the main carcass and the turn-up carcass are parallel, that is, Ha:Hb=1, the compressive stress on the turn-up carcass can be effectively reduced. On this basis, reducing the thickness of the tire bead filling rubber also has a positive effect on reducing the compressive stress of the turn-up carcass. However, in order to ensure the load-bearing performance of the tire bead, the thickness of the tire bead filling rubber strip cannot be too small. On this basis, Example 3 selects a carcass material with strong resistance to compressive strain to improve the carcass's ability to resist compressive strain. Example 4 increases the modulus of the upper filling rubber strip to enhance its performance in supporting the carcass, thereby reducing the compressive stress on the engineering machinery tire during use, which results in a large deformation of the turned-up carcass in the sidewall area due to harsh road conditions and large loads.
[0020]
[0021] The above content only describes the preferred implementation mode of the present invention, and does not limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solution of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.
Claims
1. An engineering machinery tire, comprising a carcass, a wire ring and a filling rubber, characterized in that: The carcass includes a main carcass and an inverted carcass; at the tire toe, the main carcass passes around the wire ring to form an inverted carcass that extends in the opposite direction, and the main carcass and the inverted carcass wrap the wire ring around the tire toe; and filling rubber is filled between the inverted carcass and the main carcass; The end point of the turned-up carcass shall not be lower than the horizontal axis of the engineering machinery tire.
2. The engineering machinery tire according to claim 1, characterized in that: The filling rubber includes a lower filling rubber and an upper filling rubber; the lower filling rubber is located on the upper layer of the wire ring between the inverted carcass and the main carcass and contacts the wire ring, and the cross section of the lower filling rubber extends and shrinks to the surface of the main carcass to form a substantially triangular cross section; The upper filling rubber is formed on the upper layer of the lower apex rubber between the turned-up carcass and the main carcass, the upper filling rubber contacts the surface of the lower apex rubber at the bottom, and terminates at the main carcass surface above the end point of the turned-up carcass.
3. The engineering machinery tire according to claim 2, characterized in that: The distance from the horizontal axis to the rim line is LSH, the tire bead filling thickness on the side of the upper filling rubber close to the horizontal axis is Ha, and the distance from the turned-up carcass to the horizontal axis at the position corresponding to Ha is set to LA, 0.069≤LA / LSH≤0.18; the tire bead filling thickness on the side close to the wire ring is Hb, and the distance from the turned-up carcass to the horizontal axis at the position corresponding to Hb is LB, 0.37≤LB / LSH≤0.65, and the tire bead filling thickness Ha: Hb=1.
4. The engineering machinery tire according to claim 2-3, characterized in that: The tire shoulder pad includes a tire shoulder pad which can partially cover the outer surface of the upper filling rubber.
5. The engineering machinery tire according to claim 2-3, characterized in that: The compression strain range of the tire body is 1.51%~2.53%; the modulus range of the lower filling rubber is 3.47Mpa≤E'≤6.30Mpa.
6. The engineering machinery tire according to claims 1 to 3, characterized in that: The ratio of its section width SW to section height SH is SW / SH=1.047, and the ratio of the distance LSH from the horizontal axis to the rim centerline to the section height is LSH / SH=0.5.