Inner support body of a safety tire

Abstract

The present invention discloses an inner support body of a safety tire. The inner support body is mounted on a rim and is located inside the tire. The inner support body is provided with an annular structure formed by combining at least two support units with the same structure. The radial cross-section of each support unit is in the shape of a "work" character. The support unit includes a rigid body and an explosion-proof layer. The rigid body is covered with an explosion-proof layer on all surfaces except the surface in contact with the rim. The material of the rigid body is a fiber-reinforced composite material, and the material of the explosion-proof layer is an elastic material with the function of preventing explosion impact. Through its own wear, it can not only prevent the situation where the support body or the tire catches fire after the tire is shot by a bullet or exploded by a bomb, but also ensure that the tire can reach the normal deflated driving mileage.

Description

Technical Field

[0001] The present invention belongs to the technical field of safety tires, and particularly relates to an inner support body of a safety tire. Background Art

[0002] There are mainly two structures for the existing inner support bodies of safety tires: one is an inner support body directly set as a whole; the other is provided with a buffer layer outside the first one. For example, a bulletproof tire disclosed in Chinese Patent CN106945472 specifically discloses that a layer of elastic buffer layer is wrapped outside the support body, and the elastic buffer layer is made of a soft bulletproof material. The support body is composed of two materials. One is made of a single material such as nylon, polyurethane, aluminum alloy, rubber, etc. Among them, the one made of rubber is a one-piece structure, and the other is made of aluminum alloy.

[0003] The support body made of rubber has been gradually phased out due to its low strength, heavy weight, difficult assembly, and easy combustion. The inner support body made of aluminum alloy has high stiffness and strong load-bearing capacity, but has no buffering performance, and generates high compressive stress and shear stress on the rubber of the tire crown. The rubber of the tire crown, especially the inner liner rubber, generates heat and degrades rapidly after being subjected to large compression and shear, separates from the steel wire, and the exposed steel wire rubs against the aluminum alloy support body and turns red due to heat reaching above 500°C. The instantaneous high temperature causes the inner liner rubber and the steel wire coating rubber to burn. After the connection between the hollow parts of the aluminum alloy inner support body is hit by multiple bullets, cracks expand, break, and the risk of disintegration is extremely high. The support body made of thermoplastic materials such as nylon support body and polyurethane has a heat distortion temperature lower than 120°C, and its buffering performance is better than that of the aluminum alloy support body. The compressive and shear stresses on the rubber of the tire crown and the rubber inside the tire are lower than those of the aluminum alloy support body. Irregular through ablation holes will be formed at the position hit by the bullet. When the tire deflates and travels, a thermo-mechanical coupling phenomenon occurs at the position where the support body is hit by the bullet, the deformation increases, the temperature rises, and the load-bearing capacity rapidly decreases after the temperature reaches 180°C. After the temperature inside the tire rises above 240°C, it starts to burn and fail.

[0004] With the improvement of requirements, the requirement for the deflated driving mileage of the tire has been increased from 30 - 50 kilometers to 100 kilometers or even 150 kilometers. Among them, the speed on the road is 25 - 90 kilometers per hour, and the speed for off-road driving is 30 kilometers per hour. However, the existing support bodies cannot inhibit the combustion inside the tire or the support body itself will also burn, and the deflated driving mileage of the tire can generally only be maintained at 30 to 50 kilometers, which cannot well meet the requirements. Summary of the Invention

[0005] The present invention intends to provide an inner support body of a safety tire, which can prevent the support body or the tire from burning after the tire is shot by a bullet.

[0006] To this end, the technical solution adopted by the present invention is as follows: an inner support body of a safety tire, the inner support body is installed on a rim and is located inside the tire. The inner support body is provided with an annular structure formed by combining at least two support units with the same structure. The radial cross-section of each support unit is in the shape of a "work" character. The support unit includes a rigid body and an explosion-proof layer. The rigid body is covered with an explosion-proof layer on all surfaces except the surface in contact with the rim. The material of the rigid body is a fiber-reinforced composite material, and the material of the explosion-proof layer is an elastic material with explosion-proof impact prevention.

[0007] As a preference in the above solution, the rigid body includes an intermediate layer and a housing arranged around the intermediate layer. The housing has at least two layers, and the materials on the housing are at least two different materials. The fibers on the intermediate layer are arranged in a spiral, annular or non-directional distribution.

[0008] Further preferably, the rigid body includes an outer ring arranged away from the rim and an inner ring arranged close to the rim. The outer ring and the inner ring are connected by a radially arranged intermediate rib plate. The axial dimension of the outer ring is smaller than the axial dimension of the inner ring. The axial dimension of the intermediate rib plate is smaller than the axial dimension of the outer ring. The thickness of the explosion-proof layer covered on the remaining surfaces of the outer ring except the side close to the rim and the remaining surfaces of the inner ring except the side away from the rim is not greater than the thickness of the explosion-proof layer covered outside the intermediate rib plate.

[0009] Further preferably, the axial dimension of the outer ring is not less than 40 mm, the axial dimension of the inner ring is not less than 50 mm, and the axial dimension of the intermediate rib plate is between 15 - 50 mm.

[0010] Further preferably, the radial thickness of the outer ring is not less than the radial thickness of the inner ring. The radial thickness of the outer ring is between 15 - 30 mm, and the radial thickness of the inner ring is between 5 - 15 mm.

[0011] Further preferably, a plurality of axial through holes are evenly arranged in the circumferential direction on the intermediate rib plate. The inner diameter of the axial through holes is between 10 - 40 mm, and the interval between adjacent two axial through holes is not less than 20 mm.

[0012] Further preferably, the thickness of the explosion-proof layer covered on the remaining surfaces of the outer ring except the side close to the rim and the remaining surfaces of the inner ring except the side away from the rim is between 0.25 - 10 mm. The thickness of the explosion-proof layer covered outside the intermediate rib plate, on the side of the outer ring close to the rim, and on the remaining surfaces of the inner ring except the side away from the rim is between 0.25 - 20 mm.

[0013] Further preferably, the explosion-proof layer is made of a polyurea with a tensile strength between 4 - 24 MPa, an elongation at break between 150% - 500%, and a heat distortion temperature not less than 120 °C.

[0014] Further preferably, the rigid body is made of a fiber-reinforced composite material with a flame retardant, and the wear resistance of the explosion-proof layer is lower than that of the tire rubber.

[0015] Advantages of the present invention:

[0016] 1) The support unit is composed of a rigid body and an explosion-proof layer. The modulus of the rigid body is lower than that of the aluminum alloy support body, so that its buffering performance is better than that of the aluminum alloy inner support body. The modulus of the explosion-proof layer does not exceed that of the inner tire rubber and the steel wire rubber coating of the tire. When the tire deflates, the explosion-proof layer will not wear the inner tire rubber and the steel wire rubber coating of the tire when contacting them.

[0017] 2) The rigid body uses a fiber-reinforced composite material. Since the fiber itself is a non-combustible material, it will not form ablation holes after being hit by a bullet. And because the structural stability of the fiber-reinforced composite material is better than that of nylon or polyurethane materials, the rigid body still has a supporting effect when being penetrated.

[0018] 3) The outside of the rigid body is covered with an explosion-proof layer for buffering explosion energy. The special arrangement of the fibers in the rigid body enables the alternating arrangement of the load-bearing area and the buffer area, so that it can not only absorb impacts but also prevent forward movement, achieving excellent bulletproof and mine-proof effects. The aluminum alloy inner support body, nylon or polyurethane support body have no protective ability. Moreover, according to the usage situation of the safety tire, the number of layers of the rigid body shell and the material of each layer can be specifically arranged, so as to increase or decrease the protective ability as needed.

[0019] 4) When the safety tire deflates, the explosion-proof layer contacts the tire first and then is worn out to expose the rigid body. The powder of the fiber-reinforced composite material is continuously released in the outer circle of the rigid body with the wear, achieving the goal of inhibiting the combustion of the inner tire rubber.

[0020] 5) Since the rigid body of the inner support body is wrapped by the explosion-proof layer, it is less affected by damp heat aging during daily use, the strength decreases very slowly, the service life is long, and at the same time, the strength decreases little after being hit by a bullet. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the installation schematic diagram of the present invention.

[0022] Figure 2 It is the schematic diagram of the radial cross-section of the present invention.

[0023] Figure 3 It is the size schematic diagram of the present invention.

[0024] Figure 4 It is the side view of the present invention.

[0025] Figure 5 It is the structural schematic diagram of the outer shell in the present invention.

[0026] Figure 6 This is a partially enlarged view of the outer shell of the embodiment in the present invention.

[0027] Figure 7 This is a partially enlarged view of the radial cross-section of the embodiment in the present invention.

[0028] Figure 8 This is a schematic diagram of the embodiment in the present invention after being hit by two bullets.

[0029] Figure 9 is Figure 8 the rear view.

[0030] Figure 10 is Figure 8 the enlarged view of the blocked bullet in Detailed implementation manners

[0031] The present invention will be further described below through embodiments in conjunction with the accompanying drawings:

[0032] As Figures 1-10 shown, an inner support body of a safety tire is provided on a rim and located inside the tire. The support body is arranged as an annular structure composed of at least two support units with the same structure. The radial cross-section of each support unit is in the shape of a "work" character. The above is the prior art and will not be elaborated here.

[0033] Each support unit consists of a rigid body 1 and an explosion-proof layer 2. The radial cross-section of the rigid body 1 is set in the shape of a "work" character. Except for the surface in contact with the rim, the rest of the surface of the rigid body 1 is covered with the explosion-proof layer 2. The material of the rigid body 1 is a fiber-reinforced composite material, and the material of the explosion-proof layer 2 is a polymer elastic material with explosion-proof impact prevention.

[0034] The rigid body 1 is arranged from the inside to the outside as an intermediate layer 1a and an outer shell 1b, and the outer shell 1b surrounds the intermediate layer 1a. The outer shell 1b has at least two layers, and the materials on the outer shell 1b have at least two different materials, and the arrangement methods of at least two layers of fibers are different. The distribution method of the fibers on each layer can be a directional distribution or a non-directional distribution. Preferably, the structure on the outer shell is a sandwich structure, that is, the adjacent two layers have different structures, one layer is set as a buffer material and one layer is a load-bearing material. As Figure 5 shown, there are four layers, and the materials of adjacent two layers are different. The fibers on the intermediate layer 1a are set in a spiral shape, a ring shape or a non-directional distribution. As Figure 2 shown, the parts of the intermediate layer far from and close to the rim are in a ring shape distribution, and the rest are in a non-directional distribution.

[0035] The rigid body 1 is radially arranged from far to near as an outer ring 1c, an inner ring 1d, and an intermediate rib 1e. That is, the outer ring 1c is arranged away from the rim, the inner ring 1d is arranged close to the rim, and the outer ring 1c and the inner ring 1d are connected by the radially arranged intermediate rib 1e. Among them, the axial dimension Z1 of the outer ring 1c is smaller than the axial dimension Z2 of the inner ring 1d, and the axial dimension Z3 of the intermediate rib 1e is smaller than the axial dimension Z1 of the outer ring 1c. Specifically, the axial dimension Z1 of the outer ring 1c is not less than 40 mm, the axial dimension Z2 of the inner ring 1d is not less than 50 mm, and the axial dimension Z3 of the intermediate rib 1e is between 15 - 50 mm.

[0036] Since this inner support body wears the rigid body to release the flame retardant material from the rigid body, thereby achieving the protective effect, in order to ensure the extension of the wear time of the rigid body, the radial thickness J1 of the outer ring 1c is not less than the radial thickness J2 of the inner ring. Specifically, the radial thickness J1 of the outer ring 1c is between 15 - 30 mm, and the radial thickness J2 of the inner ring 1d is between 5 - 15 mm.

[0037] To prevent bullets from directly shooting into and damaging the tire from the side, the thickness H1 of the explosion-proof layer 2 covering the remaining surfaces of the outer ring 1c except the side close to the rim and the remaining surfaces of the inner ring 1d except the side away from the rim is not greater than the thickness H2 of the explosion-proof layer 2 covering the outside of the intermediate rib 1e. Specifically, the thickness H1 of the explosion-proof layer 2 covering the remaining surfaces of the outer ring 1c except the side close to the rim and the remaining surfaces of the inner ring 1d except the side away from the rim is between 0.25 - 10 mm, and the thickness H2 of the explosion-proof layer 2 covering the outside of the intermediate rib 1e, the side of the outer ring 1c close to the rim, and the side of the inner ring 1d away from the rim is between 0.25 - 20 mm.

[0038] A plurality of axial through-holes 1f are evenly arranged circumferentially on the intermediate rib 1e, and the inner diameter of the axial through-holes 1f is between 10 - 40 mm, and the interval between adjacent two axial through-holes 1f is not less than 20 mm.

[0039] Specifically, the explosion-proof layer 2 can adopt a polyurea with a tensile strength between 4 - 24 MPa, an elongation at break between 150% - 500%, and a heat distortion temperature not less than 120 °C.

[0040] To increase the flame retardant performance of the rigid body, the rigid body 1 can adopt a fiber-reinforced composite material with a flame retardant. Specifically, the fiber-reinforced composite material includes components such as resin, fiber, filler, curing agent, and flame retardant. At the same time, the wear resistance of the explosion-proof layer can be set to be lower than that of the tire rubber, so that when driving with a flat tire, the explosion-proof layer can be quickly worn by the rubber, thereby facilitating the contact wear between the rigid body and the tire and releasing the flame retardant component.

[0041] The support unit can also be set to other shapes, or the support body can also be of other structures, as long as it is set on the rim and located inside the tire, and can play a role in supporting the tread when the tire deflates or bursts, the double-layer structure of the support unit in the application can be adopted.

[0042] The inner support body made of the above data and materials, such as Figure 6 and 7 As shown, the results of live ammunition penetration tests and bench tests are as follows: As Figures 8-10 shown, when the inner support body is shot by 2 rounds of 7.62mm bullets at a distance of 100m, one of the bullets is blocked and the other penetrates. And during the load test, the flat tire driving mileage of the car can meet the requirements. When shooting at a distance of 100m, the transverse penetration protection ability of the inner and outer rings against 7.62mm or 5.8mm bullets reaches 100%. The middle rib plate allows bullets to penetrate, but will not form tearing holes and through holes. The explosion-proof layer can buffer the impact of bullets or landmines, and the inner support body has high structural stability.

Claims

1. An inner support body of a safety tire, the inner support body being mounted on a rim and located inside the tire. The inner support body is provided as an annular structure formed by combining at least two support units with the same structure. Each support unit has an "I"-shaped radial cross-section. Characterized in that: The support unit includes a rigid body (1) and an explosion-proof layer (2). The rigid body (1) is covered with the explosion-proof layer (2) on all surfaces except the surface in contact with the rim. The material of the rigid body (1) is a fiber-reinforced composite material, and the material of the explosion-proof layer (2) is a polymer elastic material with explosion-proof impact prevention properties. The rigid body (1) includes an intermediate layer (1a) and a housing (1b) arranged around the intermediate layer (1a). The housing (1b) has at least two layers, and the materials on the housing (1b) are at least two different materials. The fibers on the intermediate layer (1a) are arranged in a spiral, annular or non-directional pattern. The rigid body (1) includes an outer ring (1c) arranged away from the rim and an inner ring (1d) arranged close to the rim. The outer ring (1c) and the inner ring (1d) are connected by a radially arranged intermediate rib (1e). The axial dimension of the outer ring (1c) is smaller than the axial dimension of the inner ring (1d). The axial dimension of the intermediate rib (1e) is smaller than the axial dimension of the outer ring (1c). The thickness of the explosion-proof layer (2) covering the remaining surfaces of the outer ring (1c) except the side close to the rim and the remaining surfaces of the inner ring (1d) except the side away from the rim is not greater than the thickness of the explosion-proof layer (2) covering the outside of the intermediate rib (1e).

2. The inner support body of the safety tire according to claim 1, Characterized in that: The axial dimension of the outer ring (1c) is not less than 40 mm, the axial dimension of the inner ring (1d) is not less than 50 mm, and the axial dimension of the intermediate rib (1e) is between 15 - 50 mm.

3. The inner support body of the safety tire according to claim 1, Characterized in that: The radial thickness of the outer ring (1c) is not less than the radial thickness of the inner ring. The radial thickness of the outer ring (1c) is between 15 - 30 mm, and the radial thickness of the inner ring (1d) is between 5 - 15 mm.

4. The inner support body of the safety tire according to claim 1, Characterized in that: A plurality of axial through holes (1f) are evenly arranged circumferentially on the intermediate rib (1e). The inner diameter of the axial through holes (1f) is between 10 - 40 mm, and the interval between adjacent two axial through holes (1f) is not less than 20 mm.

5. The inner support body of the safety tire according to claim 1, Characterized in that: The thickness of the explosion-proof layer (2) covering the remaining surfaces of the outer ring (1c) close to the rim and the remaining surfaces of the inner ring (1d) except the side away from the rim is between 0.25 - 10 mm. The thickness of the explosion-proof layer (2) covering the outside of the intermediate rib (1e), the surface of the outer ring (1c) close to the rim, and the surfaces of the inner ring (1d) except the side away from the rim is between 0.25 - 20 mm.

6. The inner support body of the safety tire according to claim 1, Characterized in that: The explosion-proof layer (2) is made of polyurea with a tensile strength between 4 - 24 MPa, an elongation at break between 150% - 500%, and a heat distortion temperature of not less than 120 °C.

7. The inner support body of the safety tire according to claim 1, characterized in that: the rigid body (1) is made of a fiber-reinforced composite material with a flame retardant, and the wear resistance of the explosion-proof layer (2) is lower than that of the tire rubber.

Images