Lightweight diagonal tire body structure suitable for small-specification aircraft tire

Abstract

The invention belongs to the technical field of aircraft tires, and particularly relates to a light-weight diagonal tire body structure suitable for small-specification aircraft tires, which comprises an airtight layer, a sidewall rubber layer, an upper tread rubber layer and a tire body cord fabric layer, and the tire body cord fabric layer comprises a steel wire ring, apex, a cord fabric layer A, a cord fabric layer B and a lower tread rubber layer. According to the invention, only two layers of turn-up cord fabric layer A and cord fabric layer B can be arranged, and the turn-up end point butt joint part of the two sides of the cord fabric layer B reaches the center position of the tire crown, so that the reinforcing effect is achieved, the tire crown modulus can be increased, the maximum speed of the tire is effectively improved, and the service life of the tire is prolonged; and the situation that two reinforcing positive wrapping cord fabric layers need to be additionally arranged for an existing oblique crossing aircraft tire to guarantee the integrity of the tire is not needed, the number of the cord fabric layers is effectively reduced under the condition that the aircraft tire bears a certain load, the weight of the tire is reduced, meanwhile, the machining procedures can be reduced, and the economical efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft tires, in particular to a lightweight bias carcass structure suitable for small-size aircraft tires. Background Art

[0002] Bias aircraft tires refer to pneumatic tires in which the cords of adjacent layers of tire ply cross and are arranged at a certain angle to the center line of the tire. They are widely used in the field of aircraft tires. Due to the structural characteristics of bias tires, the number of carcass plies is agreed to be an even number to ensure the overall structural stability of the tire. At present, most low-load, small-sized bias aircraft tires generally have a four-layer carcass ply structure (two layers of reversed ply and two layers of positive ply), and the weight of a single tire is more than 3kg, which is increasingly unable to meet the growing weight control needs of aircraft. The development of lightweight small-sized aircraft tires not only reduces the manufacturing cost of the product, but also fills the gap of the current lack of lightweight aircraft tires. Summary of the invention

[0003] In view of the above problems, an object of the present invention is to provide a lightweight bias carcass structure suitable for small-sized aircraft tires.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A lightweight bias carcass structure suitable for a small-sized aircraft tire, comprising an airtight layer, a sidewall rubber layer, an upper tread rubber layer, and a carcass cord layer, wherein the airtight layer is located at the inner periphery of the entire carcass cord layer, the sidewall rubber layer and the upper tread rubber layer are respectively located at the outer periphery of the entire carcass cord layer, a tread groove is formed on the outer peripheral surface of the upper tread rubber layer, the carcass cord layer comprises a wire ring and a apex rubber, the carcass cord layer further comprises a cord layer A, a cord layer B and a lower tread rubber layer, the cord layer A The cord layers B are respectively turned up on the outside of the whole formed by the steel wire and the apex rubber, the cord layer A is located on the inside of the cord layer B, the height positions of the turned-up end points B on both sides of the cord layer B respectively exceed the height positions of the tire shoulders and are butted against each other, the lower tread rubber layer is located directly below the upper tread rubber layer, and the lower tread rubber layer is located between the cord layer B and the cord layer A, and the butt joint of the turned-up end points B on both sides of the cord layer B is located between the lower tread rubber layer and the upper tread rubber layer.

[0006] The height positions of the turned-up end points A on both sides of the cord layer A are respectively equal to or higher than the height position of the end of the apex rubber away from the wire ring.

[0007] The hardness of the upper tread rubber layer is higher than that of the lower tread rubber layer, and the tensile stress of the upper tread rubber layer is higher than that of the lower tread rubber layer.

[0008] The butt joint of the turn-up end points B on both sides of the cord layer B is located at the center line of the tire crown.

[0009] The advantages and positive effects of the present invention are:

[0010] The present invention can be provided with only two layers of turned-up cord layer A and cord layer B, and by making the turned-up end points of the cord layer B on both sides butt joint to reach the center position of the crown, it can play a reinforcing role and increase the crown modulus, effectively improve the maximum speed of the tire, and increase the service life of the tire. There is no need to additionally provide two layers of reinforced positive cord layers to ensure the integrity of the tire as in the existing bias aircraft tire. Under the condition that the aircraft tire can withstand a certain load, the number of cord layers is effectively reduced, the weight of the tire is reduced, and the processing procedures can also be reduced, thereby improving the economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention.

[0012] In the figure: 1 is the cord layer A, 101 is the turn-up end point A, 2 is the cord layer B, 201 is the turn-up end point B, and 3 is the lower tread rubber layer;

[0013] 001 is the airtight layer, 002 is the sidewall rubber layer, 003 is the upper tread rubber layer, 004 is the tread groove, 005 is the wire ring, and 006 is the apex rubber. DETAILED DESCRIPTION

[0014] The following is combined with Figure 1 The present invention is further described in detail.

[0015] A lightweight bias carcass structure suitable for small-sized aircraft tires, such as Figure 1 As shown, in this embodiment, the airtight layer 001, the sidewall rubber layer 002, the upper tread rubber layer 003, and the carcass ply are included. The airtight layer 001 is located at the inner periphery of the carcass ply as a whole, the sidewall rubber layer 002 and the upper tread rubber layer 003 are respectively located at the outer periphery of the carcass ply as a whole, the outer peripheral surface of the upper tread rubber layer 003 is formed with a pattern groove 004, and the carcass ply includes a wire bead 005 and an apex rubber 006. In this embodiment, the arrangement and structure of the airtight layer 001, the sidewall rubber layer 002, the upper tread rubber layer 003 and the carcass ply as a whole respectively adopt the existing technology, and the arrangement between the wire bead 005 and the apex rubber 006 in the carcass ply also adopts the existing technology.

[0016] In this embodiment, the carcass ply also includes a ply A1, a ply B2 and a lower tread rubber layer 3, and the ply A1 and the ply B2 are respectively turned up on the outside of the whole formed by the bead ring 005 and the apex rubber 006, and the way of turning up is adopted by the existing technology. The height positions of the turned-up end points A101 on both sides of the ply A1 are respectively equal to the height position of the end of the apex rubber 006 away from the bead ring 005, or higher than the height position of the end of the apex rubber 006 away from the bead ring 005.

[0017] In this embodiment, the cord layer A1 is wrapped inside the cord layer B2, the height positions of the turned-up endpoints B201 on both sides of the cord layer B2 exceed the height position of the tire shoulder and butt with each other, the lower tread rubber layer 3 is located directly below the upper tread rubber layer 003, and the lower tread rubber layer 3 is located between the cord layer B2 and the cord layer A1, and the butt joint of the turned-up endpoints B201 on both sides of the cord layer B2 is located between the lower tread rubber layer 3 and the upper tread rubber layer 003 and at the center line of the tire crown. By making the butt joint of the turned-up endpoints B201 on both sides of the cord layer B2 reach the crown, it plays a reinforcing role and can increase the crown modulus, effectively improve the maximum speed of the tire, and increase the service life of the tire, without the need to set up two additional layers of reinforcing positive cord layers as in the existing bias aircraft tire, and under the condition that the aircraft tire can withstand a certain load, the lower limit of the tire weight is broken to the greatest extent, which meets the design trend of lightweight.

[0018] Specifically, in this embodiment, the hardness of the upper tread rubber layer 003 is higher than that of the lower tread rubber layer 3, and the tensile stress of the upper tread rubber layer 003 is greater than that of the lower tread rubber layer 3. In this embodiment, the hardness of the upper tread rubber layer 003 is 74 degrees, and the tensile stress is 18Mpa; the hardness of the lower tread rubber layer 3 is 70 degrees, and the tensile stress is 15Mpa. The hardness of the upper tread rubber layer 003 is higher than that of the lower tread rubber layer 3, which can improve the wear resistance, tearing and weather aging resistance, and improve the service life; while the lower tread rubber layer 3 is slightly softer in hardness, slightly lower in tensile stress, and lower in heat generation, which plays a good buffering and transition role between the harder upper tread rubber layer 003 and the softer tire body, and can ensure that each part of the crown has a good hardness gradient, and improve the service life and safety.

Claims

1. A lightweight bias carcass structure suitable for a small-sized aircraft tire, comprising an airtight layer (001), a sidewall rubber layer (002), an upper tread rubber layer (003), and a carcass cord layer, wherein the airtight layer (001) is located at the inner periphery of the entire carcass cord layer, the sidewall rubber layer (002) and the upper tread rubber layer (003) are respectively located at the outer periphery of the entire carcass cord layer, a tread groove (004) is formed on the outer peripheral surface of the upper tread rubber layer (003), and the carcass cord layer comprises a wire ring (005) and an apex rubber (006), characterized in that: The carcass ply also includes a ply A (1), a ply B (2) and a lower tread rubber layer (3). The ply A (1) and the ply B (2) are respectively turned up on the outer side of the whole formed by the wire ring (005) and the apex rubber (006). The ply A (1) is located on the inner side of the ply B (2). The height positions of the turned-up end points B (201) on both sides of the ply B (2) exceed the height position of the tire shoulder and are butted against each other. The lower tread rubber layer (3) is located directly below the upper tread rubber layer (003). The lower tread rubber layer (3) is located between the ply B (2) and the ply A (1). The butt joint of the turned-up end points B (201) on both sides of the ply B (2) is located between the lower tread rubber layer (3) and the upper tread rubber layer (003).

2. The lightweight bias carcass structure suitable for small-sized aircraft tires according to claim 1, characterized in that: The height positions of the turned-up end points A (101) on both sides of the cord layer A (1) are respectively equal to the height position of the end of the apex rubber (006) away from the wire ring (005), or higher than the height position of the end of the apex rubber (006) away from the wire ring (005).

3. The lightweight bias carcass structure suitable for small-sized aircraft tires according to claim 1, characterized in that: The hardness of the upper tread rubber layer (003) is higher than the hardness of the lower tread rubber layer (3), and the tensile stress of the upper tread rubber layer (003) is higher than the tensile stress of the lower tread rubber layer (3).

4. The lightweight bias carcass structure suitable for small-sized aircraft tires according to claim 1, characterized in that: The butt joint of the turn-up end points B (201) on both sides of the cord layer B (2) is located at the center line of the tire crown.

Images