A puncture resistant inner tube

Abstract

The utility model provides a kind of anti-tear inner tube, including inner tube main body, inner tube air nozzle, circumferential grain projection and longitudinal grain projection, the inner tube air nozzle is installed and arranged in the inner ring of inner tube main body, the outer ring surface of inner tube main body is integrally provided with several equidistantly arranged circumferential grain projection and longitudinal grain projection;The grid grain formed by the circumferential grain projection and longitudinal grain projection of the utility model disperses stress to multiple units, the intersection point fillet eliminates secondary stress concentration, reduces tear starting point;Gradient thickness design strengthens shoulder and tread, improves tensile extrusion capacity, delays fatigue tear;Grid grain increases friction, inhibits inner tube and outer tube sliding, reduces wear imbalance. Grid can be along with change expansion and contraction, bead has no grain to seal, gap helps heat dissipation, delays rubber aging, improves stability.

Description

Technical Field

[0001] This utility model belongs to the field of inner tube technology, and in particular relates to a tear-resistant inner tube. Background Technology

[0002] In existing technologies, the inner tube, as the core inflation component of a tire, directly affects its service life and safety due to its tear resistance. Traditional inner tubes typically have a smooth surface design, which presents the following technical problems in practical use:

[0003] High risk of tearing: The shoulder area (both sides of the outer rim) and tread area (middle of the outer rim) of the inner tube are critical areas where stress is concentrated and deformation is frequent. The shoulder repeatedly bears bending and tensile stress as the wheel rolls, while the tread directly transmits the ground reaction force and compressive load. Smooth surfaces make it difficult to disperse local stress, easily forming stress concentration points on the shoulder and tread. When punctured by a sharp object, squeezed by the rim edge, or subjected to repeated deformation fatigue, it is very easy to tear locally and spread rapidly.

[0004] Wear and tearing caused by relative displacement: The friction coefficient of the smooth surfaces between the inner tube and the outer tire and rim is low, making it easy for relative slippage to occur when the vehicle is turning, bumping, or traveling at high speed. This slippage not only aggravates the wear on the inner tube surface, but also leads to local force imbalance, further increasing the probability of tearing (such as the inner tube being squeezed into the gap between the rim and the outer tire during slippage, forming a "snake bite" tear).

[0005] Therefore, it is essential to invent a tear-resistant inner tube. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a tear-resistant inner tube, including an inner tube body, an inner tube valve, circumferential tread protrusions and longitudinal tread protrusions. The inner tube valve is installed on the inner ring of the inner tube body, and a plurality of equidistant circumferential tread protrusions and longitudinal tread protrusions are integrally provided on the outer ring surface of the inner tube body, i.e. the tread and the shoulder.

[0007] Preferably, the inner ring area of ​​the inner tube body is the bead area, the two sides of its outer ring are the shoulder areas, and the area between the middle of the outer ring and the shoulder is the tread area. The thickness of the inner tube body is set in a gradient increasing manner, with the thickness of the bead area being less than the thickness of the shoulder area and the tread area, and the thickness of the shoulder area being less than the thickness of the tread area.

[0008] Preferably, the inner tube valve is installed in the bead area of ​​the inner tube body, but is not integrally formed with circumferential and longitudinal tread protrusions. The two shoulder areas and the tread area of ​​the inner tube body are provided with circumferential and longitudinal tread protrusions.

[0009] Preferably, the circumferential tread protrusions and longitudinal tread protrusions are arranged in the shoulder area and tread area of ​​the inner tube body, the circumferential tread protrusions are equidistantly arranged along the axial direction of the inner tube body, and the longitudinal tread protrusions are arranged in a circumferential array.

[0010] Preferably, the circumferential and longitudinal tread protrusions together form a grid pattern in the shoulder and tread areas of the inner tube body, with rounded corners at their intersections and the same height.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The circumferential and longitudinal tread patterns in the tire shoulder and tread areas of this invention form a grid pattern, which can disperse local stress to multiple grid units and avoid stress concentration at a single point (such as when the tread is compressed, the grid structure bears the load together through intersecting ribs); the intersections are designed with rounded corners to eliminate secondary stress concentration caused by sharp corners, further reducing the probability of tear initiation.

[0013] In addition, the inner tube body of this utility model adopts a gradient thickness design (bead area < shoulder area < tread area) to specifically strengthen the structural strength of easily torn parts such as the shoulder and tread, so that key areas can withstand greater tensile and compressive stress and slow down the fatigue tearing rate.

[0014] The grid pattern of this invention increases the friction coefficient between the inner tube and the inner wall of the outer tube through its concave-convex structure, effectively suppressing the relative slippage between the two under dynamic force (especially in scenarios such as tire shoulder turning and tread deformation), avoiding local wear and force imbalance caused by slippage, and indirectly reducing the risk of tearing.

[0015] The elastic ribs of the grid pattern of this utility model can flexibly expand and contract with the bending deformation of the tire shoulder and the compression and rebound of the tire tread, adapting to the dynamic deformation requirements of the inner tube; at the same time, the treadless design in the bead area ensures a tight fit with the rim, avoids the tread pattern from interfering with the sealing performance, and takes into account the stability and deformation adaptability of key areas.

[0016] The gaps between the grid patterns of this invention form natural heat dissipation channels, which can accelerate the air circulation between the inner tube and the outer tube, remove the heat generated by friction, and delay rubber aging (high temperature will reduce the tear resistance of rubber); the gradient thickness design allows the inner tube to fit the curvature of the inner wall of the outer tube better, reduce uneven stress caused by local suspension, and further improve the overall structural stability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the grid pattern structure of this utility model.

[0019] Figure 3 This is a partial cross-sectional structural diagram of the present invention.

[0020] In the picture:

[0021] Inner tube body 1, inner tube valve 2, circumferential tread protrusion 3, longitudinal tread protrusion 4. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0023] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for 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 the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed 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 a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0024] As attached Figure 1 To be continued Figure 3 As shown:

[0025] The present invention provides a tear-resistant inner tube, comprising an inner tube body 1, an inner tube valve 2, circumferential tread protrusions 3 and longitudinal tread protrusions 4. The inner tube valve 2 is installed on the inner ring of the inner tube body 1, and a plurality of equidistant circumferential tread protrusions 3 and longitudinal tread protrusions 4 are integrally provided on the outer ring surface of the inner tube body 1.

[0026] Furthermore, the inner tube body 1 is functionally divided into three parts: the annular area where the inner ring directly contacts the rim is the bead area; the transition arc-shaped areas on both sides of the outer ring connecting the bead and the tread are the shoulder areas; and the main load-bearing area in the middle of the outer ring and between the two shoulders is the tread area. To accommodate the stress requirements of different areas, the inner tube body 1 adopts a gradient thickness design: the bead area has the smallest thickness (usually 1.2-1.5mm), using high-elasticity butyl rubber to ensure a tight fit and sealing performance with the rim; the shoulder area is slightly thicker than the bead area (usually 1.5-2.0mm), with 10%-15% natural rubber added to enhance resistance to bending fatigue; and the tread area has the largest thickness (usually 2.0-2.5mm), using high-strength butyl rubber mixed with 5% aramid short fibers to improve resistance to compression and tension. The thickness transitions between the three areas are connected by smooth arc surfaces to avoid stress concentration caused by abrupt changes in thickness.

[0027] Furthermore, the inner tube valve 2 is sealed and installed in the bead area of ​​the inner tube body 1 through a vulcanization process. The connection between the valve root and the bead area uses a rounded corner with a radius of 5-8mm and is nested with a reinforcing rubber ring (0.5mm thick) to improve the connection strength between the valve and the inner tube body 1. The surface of the bead area of ​​the inner tube body 1 remains smooth and without treads to ensure complete contact with the inner wall of the rim and avoid poor sealing caused by tread patterns. The two shoulder areas and the tread area are integrally formed with circumferential tread protrusions 3 and longitudinal tread protrusions 4, forming a functional tread structure. The tread density in the shoulder area is slightly higher than that in the tread area (shoulder tread spacing 8-10mm, tread tread spacing 10-12mm) to accommodate the more frequent bending deformation of the shoulder.

[0028] Furthermore, both the circumferential tread protrusions 3 and the longitudinal tread protrusions 4 are made of the same butyl rubber material as the inner tube body 1 (the protrusions in the tread area are mixed with the same proportion of aramid short fibers) and are integrally vulcanized by a mold. Among them, the circumferential tread protrusions 3 are equidistantly arranged along the central axis (axial direction) of the inner tube body 1, with a spacing of 10-12mm between adjacent protrusions. The cross-section of the protrusion is semi-circular (diameter 2-3mm), and the length covers the circumferential width of the entire shoulder and tread area. The longitudinal tread protrusions 4 are distributed in an array along the circumferential direction of the inner tube body 1, with a circumferential angle spacing of 5°-8° between adjacent protrusions (i.e., 45-72 protrusions per circle). The cross-section of the protrusion is also semi-circular (diameter 2-3mm), and the length extends from the shoulder area to the edge of the tread area, forming a perpendicular intersection with the circumferential tread protrusions 3.

[0029] Furthermore, the circumferential tread protrusions 3 and longitudinal tread protrusions 4 naturally merge at their intersections, forming a continuous grid pattern structure in the tire shoulder and tread areas. The grid units are square or rhomboid (side length 10-12mm). The intersection points of the two are designed with rounded corners with a radius of 1-1.5mm to eliminate stress concentration at sharp angles. The circumferential tread protrusions 3 and longitudinal tread protrusions 4 have the same height (2-3mm from the surface of the inner tube body 1), ensuring that the top surface of the grid pattern is flat and can form uniform contact with the inner wall of the outer tire, avoiding excessive local stress. In this grid structure, the root width of a single protrusion (the part connecting with the inner tube body 1) is increased by 20% compared to the top width, further improving the tear resistance of the protrusion.

[0030] The working principle is as follows: First, after the inner tube is inflated, the inner tube body 1 expands due to its own elasticity. The bead area fits tightly against the rim to achieve a seal, while the shoulder area and tread area contact the inner wall of the outer tire. At this time, the circumferential tread protrusions 3 and the longitudinal tread protrusions 4 form multiple points of contact with the inner wall of the outer tire, increasing the friction between the inner tube and the outer tire and reducing the slippage that occurs during relative movement, thereby reducing the risk of wear and tear caused by friction.

[0031] Secondly, during vehicle operation, the tread area bears vertical pressure and impact from the ground, while the shoulder area undergoes repeated bending deformation as the wheel rotates. The gradient thickness design of the inner tube body 1 comes into play, with the thicker tread and shoulder areas better distributing and bearing these stresses, preventing localized tearing due to excessive force.

[0032] Furthermore, the grid pattern structure formed by the circumferential tread protrusions 3 and the longitudinal tread protrusions 4 disperses the stress on the tire shoulder and tread areas to multiple grid units. When subjected to local compression or tension, the grid structure resists deformation through overall stress distribution, and the rounded corner design at the intersections avoids stress concentration, further enhancing the inner tube's tear resistance.

[0033] Finally, the inner tube valve 2 is firmly connected to the bead area of ​​the inner tube body 1 through a vulcanization process, ensuring the sealing during inflation and deflation. At the same time, the reinforced rubber ring at its root and the rounded corner transition design prevent tearing around the valve due to stress concentration, ensuring the normal operation of the inner tube as a whole.

[0034] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A tear-resistant inner tube, characterized in that, The inner tube body (1) includes an inner tube valve (2), circumferential tread protrusions (3) and longitudinal tread protrusions (4). The inner tube valve (2) is installed on the inner ring of the inner tube body (1). Several circumferential tread protrusions (3) and longitudinal tread protrusions (4) are integrally arranged on the outer ring surface of the inner tube body (1), i.e. the tread and the shoulder.

2. The tear-resistant inner tube as described in claim 1, characterized in that: The inner ring area of ​​the inner tube body (1) is the bead area, the two sides of its outer ring are the shoulder areas, and the area between the middle of the outer ring and the shoulder is the tread area. The thickness of the inner tube body (1) is set in a gradient increasing manner, with the thickness of the bead area being less than the thickness of the shoulder area and the tread area, and the thickness of the shoulder area being less than the thickness of the tread area.

3. The tear-resistant inner tube as described in claim 2, characterized in that: The inner tube body (1) has an inner tube valve (2) installed in the bead area, but it is not integrally formed with circumferential tread protrusions (3) and longitudinal tread protrusions (4). The inner tube body (1) has circumferential tread protrusions (3) and longitudinal tread protrusions (4) in the two shoulder areas and the tread area.

4. The tear-resistant inner tube as described in claim 3, characterized in that: The circumferential tread protrusions (3) and longitudinal tread protrusions (4) are arranged in the shoulder area and tread area of ​​the inner tube body (1). The circumferential tread protrusions (3) are arranged at equal intervals along the axial direction of the inner tube body (1), and the longitudinal tread protrusions (4) are arranged in a circular array.

5. The tear-resistant inner tube as described in claim 4, characterized in that: The circumferential tread protrusions (3) and longitudinal tread protrusions (4) together form a grid pattern in the shoulder area and tread area of ​​the inner tube body (1), with rounded corners at their intersection and the same height.

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