CN108081872B - Non-pneumatic tire based on concave hexagonal negative poisson ratio supporting structure - Google Patents
Non-pneumatic tire based on concave hexagonal negative poisson ratio supporting structure Download PDFInfo
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- CN108081872B CN108081872B CN201810068301.6A CN201810068301A CN108081872B CN 108081872 B CN108081872 B CN 108081872B CN 201810068301 A CN201810068301 A CN 201810068301A CN 108081872 B CN108081872 B CN 108081872B
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- negative poisson
- poisson ratio
- reinforcing ring
- concave
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- 230000003014 reinforcing effect Effects 0.000 claims abstract description 52
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000005187 foaming Methods 0.000 claims abstract description 9
- 229920002635 polyurethane Polymers 0.000 claims abstract description 9
- 239000004814 polyurethane Substances 0.000 claims abstract description 9
- 229920001971 elastomer Polymers 0.000 claims description 10
- 239000011159 matrix material Substances 0.000 claims description 10
- 239000005060 rubber Substances 0.000 claims description 10
- 238000005452 bending Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000004677 Nylon Substances 0.000 claims description 4
- 229920001778 nylon Polymers 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 210000000078 claw Anatomy 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims 1
- 239000011148 porous material Substances 0.000 abstract 1
- 210000004027 cell Anatomy 0.000 description 78
- 239000010410 layer Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 210000002421 cell wall Anatomy 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 241000208689 Eucommia ulmoides Species 0.000 description 1
- 241000245665 Taraxacum Species 0.000 description 1
- 235000005187 Taraxacum officinale ssp. officinale Nutrition 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/01—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C2001/0091—Compositions of non-inflatable or solid tyres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/04—Tyres specially adapted for particular applications for road vehicles, e.g. passenger cars
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
The invention discloses a non-pneumatic tire based on a concave hexagonal negative poisson ratio supporting structure, which sequentially comprises a tread, a tire body and a negative poisson ratio supporting structure from outside to inside along the radial direction, wherein the inner side of the tread and the outer side of the tire body are glued into a whole, and the tire body is made of polyurethane foaming material with the characteristic of negative poisson ratio; the negative poisson ratio supporting structure comprises an outer reinforcing ring, an inner reinforcing ring and a negative poisson ratio multicellular supporting body connected with the inner reinforcing ring and the outer reinforcing ring; the multicellular support is formed by mutually connecting a plurality of concave hexagonal unit structures which are distributed in a concentric annular mode through connecting cell arms, wherein each concave hexagonal unit structure is formed by orthogonally nesting and connecting a pair of concave hexagonal unit structures. The non-pneumatic tire provided by the invention has the characteristics of load enhancement of negative poisson ratio, rigidity and strength in the radial direction and the axial direction by combining the porous material with the negative poisson ratio and the multi-cell structure, and the running bearing property and the lateral stability of the non-pneumatic tire are effectively improved.
Description
Technical Field
The invention relates to the technical field of automobile tires, in particular to a non-pneumatic tire based on a concave hexagonal negative poisson ratio supporting structure.
Background
The pneumatic tire with the inner tube widely used at present is a comprehensive solution for ensuring the running performance, smoothness and comfortableness of a vehicle in the running process, but the pneumatic tire has the potential safety hazard of easy tire burst and needs to be maintained regularly. In addition, the pneumatic tire cannot achieve an ideal attachment state during braking, and an electronic control system such as an ABS (anti-lock braking system), an ESP (electronic stability program) and the like are additionally arranged to compensate for the vehicle braking defect generated by the pneumatic tire, so that the complexity of a vehicle system and the cost of the whole vehicle are increased. Non-pneumatic tires have become an important technical trend in the tire industry by virtue of their advantages in terms of safety, stability, load-bearing properties, adhesion, etc., and have received extensive attention from manufacturers and researchers.
CN206306739U discloses a inflation-free tire, including the rubber tread, with the rubber tread glue as an organic whole the basal rubber to and outside and rubber tread are connected, inboard and rim connection play support effect's elastic support body, and the support body is outer bearing ring, middle part support body and interior bearing ring from outer to interior in proper order, the support body comprises a plurality of V-arrangement subassemblies of circumference evenly distributed's first support body and second support body, and wherein first support body is formed by connecting, and the second support body comprises positive V subassembly and the negative poisson ratio unit that falls V subassembly and connect and form along circumference evenly distributed. However, the middle support body having the core supporting function is made of elastic materials such as rubber, so that sufficient supporting rigidity and strength cannot be provided, and the through structure can enable the wheel to generate larger pneumatic noise due to the fact that air flows through the inner surface of the support body when the wheel rotates at a high speed.
CN102529583B discloses an ultra-light weight non-pneumatic tire structure based on a negative poisson's ratio structure, comprising a central axis of rotation, a set of concentric rings of negative poisson's ratio unit cells rotating around the central axis, each negative poisson's ratio unit cell being composed of a set of nested members constituting the negative poisson's ratio structure. The negative poisson's ratio structure is formed by connecting a first V-shaped substructure (support) under compression and a second V-shaped substructure (tendon) under tension. An interlayer material or a filler material may be placed between each two concentric rings. The outermost unit cells are covered with a layer of material suitable for contact with the ground to form a complete tire. However, the negative poisson's ratio structure described in this patent only provides a negative poisson's ratio effect in the tire radial direction, and cannot ensure the tire lateral rigidity and strength, so that the lateral stability of the non-pneumatic tire is insufficient. In addition, only one layer of contact-resistant material is arranged between the negative poisson ratio annular structure and the ground, and road impact born by the tire in the running process is directly transmitted to the annular structure, so that the structure generates larger vibration to influence the running smoothness of the vehicle.
Disclosure of Invention
The invention aims to provide a non-pneumatic tire based on a concave hexagonal negative Poisson ratio supporting structure, the bearing property and the stability of the tire are obviously improved by virtue of the negative Poisson ratio effect in the radial direction and the lateral direction, meanwhile, the tire structure is stable, the anti-seismic performance is good, and the geometric-performance relationship of a negative Poisson ratio multicell structure also enables the novel non-pneumatic tire to have excellent function guiding design characteristics.
The technical solution for realizing the purpose of the invention is as follows: a non-pneumatic tire based on a concave hexagonal negative poisson ratio supporting structure, which sequentially comprises a tread, a carcass and the negative poisson ratio supporting structure from outside to inside along the radial direction; the inner side of the tread and the outer side of the carcass are glued into a whole, and the carcass is made of polyurethane foaming materials with negative poisson ratio characteristics;
the negative poisson ratio supporting structure comprises an outer reinforcing ring, an inner reinforcing ring and a negative poisson ratio multicellular supporting body, wherein the outer reinforcing ring is clamped and connected with the inner side of a carcass, the inner reinforcing ring is connected with a wheel rim, and the negative poisson ratio multicellular supporting body is connected with the inner reinforcing ring and the outer reinforcing ring; the negative poisson ratio multicell support is formed by mutually connecting a plurality of concave hexagonal unit structures which are concentrically and annularly distributed through connecting cell arms, and each concave hexagonal unit structure is formed by orthogonally nesting and connecting a pair of concave hexagonal unit structures.
Compared with the prior art, the invention has the remarkable advantages that:
(1) According to the non-pneumatic tire, the concave hexagonal negative poisson ratio multi-cell supporting structure which is concentrically and annularly distributed is adopted, so that the tire has a negative poisson ratio effect in the radial direction and the lateral direction; when bearing radial load, the negative poisson ratio supporting structure can shrink locally to the loaded area, so that the equivalent strength and rigidity of the structure are improved, and the bearing performance of the tire is improved; the lateral negative poisson's ratio effect of the support structure can improve the lateral stability of the tire during running; (2) The carcass of the non-pneumatic tire is cast by taking polyurethane obtained by a secondary foaming method as a matrix material, is an isotropic negative poisson ratio material, and further improves the bearing property and stability of the non-pneumatic tire; meanwhile, the negative poisson ratio carcass has good impact resistance and shock resistance, and is beneficial to improving the running smoothness of the vehicle; (3) The negative poisson ratio carcass is clamped and connected with the adaptation groove through the claw structure, so that the connection strength between the inner side annular surface of the carcass and the outer side annular surface of the outer reinforcement ring is enhanced, the safety of the tire is remarkably improved, and the risk of ring disengagement of the tire in the high-speed running process is avoided; meanwhile, the detachable carcass is adopted, so that the replacement difficulty and maintenance cost of the non-pneumatic tire are reduced; (4) The cross section of the non-pneumatic tire in the circumferential direction of the tread adopts an arch design, wherein the upper arc of the cross section is in a multi-segment arc tangent shape, the thickness of the tire shoulders at two sides is slightly lower than the thickness of the central area of the tread, so that the wear of the tread of the tire can be reduced, the drainage of the tire can be improved, and the grip of the tire when the tire runs on a wet road surface can be improved.
Drawings
Fig. 1 is a schematic view of a non-pneumatic tire based on a concave hexagonal negative poisson's ratio support structure according to a first embodiment of the present invention.
Fig. 2 is a schematic diagram of a concave hexagonal negative poisson's ratio cell structure according to a first embodiment of the present invention.
Fig. 3 is a schematic diagram of a negative poisson's ratio support structure according to a first embodiment of the present invention.
Fig. 4 is a schematic view of a tread circumferential cross section of a first embodiment of the present invention.
FIG. 5 is a schematic circumferential cross-section of a tread, carcass and outer reinforcing ring connection of a first embodiment of the present invention.
Fig. 6 is a schematic diagram of a concave hexagonal negative poisson's ratio cell structure according to a second embodiment of the present invention.
Fig. 7 is a schematic diagram of a negative poisson's ratio support structure according to a second embodiment of the present invention.
Detailed Description
A non-pneumatic tire based on a concave hexagonal negative poisson's ratio supporting structure comprises a tread 1, a carcass 2 and the negative poisson's ratio supporting structure from outside to inside in sequence along the radial direction; the inner side of the tread 1 is glued with the outer side of the carcass 2 into a whole, and the carcass 2 is made of polyurethane foaming materials with negative poisson ratio characteristics;
The negative poisson ratio supporting structure comprises an outer reinforcing ring 31, an inner reinforcing ring 32 and a negative poisson ratio multicellular supporting body 33, wherein the outer reinforcing ring 31 is clamped and connected with the inner side of the carcass 2, the inner reinforcing ring 32 is connected with the rim of the wheel, and the negative poisson ratio multicellular supporting body 33 is connected with the inner reinforcing ring and the outer reinforcing ring; the negative poisson ratio multicell support body 33 is formed by mutually connecting a plurality of concave hexagonal unit cell structures 331 which are concentrically and annularly distributed through connecting cell arms 332, and each concave hexagonal unit cell structure 331 is formed by orthogonally nesting and connecting a pair of concave hexagonal unit cell structures.
Further, each concave hexagonal unit structure is in a left-right symmetrical dovetail shape, two equal-length vertical edges at the outer side are provided with supporting cell arms 334, the length is H, four equal-length oblique edges at the inner side are provided with bending cell arms 333, the length is L, the included angle between the supporting cell arms 334 and the bending cell arms 333 is theta, theta is less than 90 degrees, and the length relation between the supporting cell arms 334 and the bending cell arms 333 meets the formula H > 2. Cos theta. L; the two concave hexagons are arranged orthogonally and intersect at two concave points 335 to form a complete concave hexagonal cell structure 331.
Further, the concave hexagonal cell structures 331 are connected to each other in the radial direction by connecting cell arms 332, and are connected to each other in the circumferential direction and the rotation axis direction by common supporting cell arms 334, thereby forming a negative poisson's ratio multicell support body 33 having a periodic cell structure in three directions. The number of unit cells 331 in one turn of the multi-cell support 33 in the circumferential direction is called a cycle number t, the number of unit cells in the radial direction is called a turn number c, the number of unit cells in the rotation axis direction is called a layer number l, and the cycle number, the turn number and the layer number of the multi-cell support 33 are different according to different performance requirements of the tire.
Further, the pair of concave hexagonal unit structures formed by the curved cell arm 333 and the supporting cell arm 334 have inner angles greater than 180 ° at the upper and lower concave points, and the initial radial distance between the two concave points 335 is greater than half the length of the supporting cell arm 334.
Further, the curved cell arm 333, the supporting cell arm 334 and the connecting cell arm 332 are equal-cross-section beams or variable-cross-section beams, and the cross section is circular or rectangular.
Further, the bent cell arms 333, the supporting cell arms 334 and the connecting cell arms 332 are made of metal, rubber, ceramic, fiber reinforcement, nylon or polymer.
Further, the geometry of the cell structure 331 is uniform in each turn, and varies from turn to turn depending on the different performance requirements of the tire.
Further, the outer reinforcing ring 31 has a ring structure, the outer side of the circumferential section of the outer reinforcing ring is provided with an inward concave groove 311, and the inner side of the outer reinforcing ring is connected with the outermost unit cell structure of the negative poisson ratio multicellular support 33; the inner reinforcing ring 32 has a ring-shaped structure, the circumferential cross section of which is a matrix, the outer side of the cross section is connected with the innermost unit cell structure of the negative poisson's ratio multicellular support 33, and the inner side of the cross section is connected with the rim of the wheel.
Further, the carcass 2 is of a ring-shaped structure, wherein the inner side of the carcass 2 is provided with a two-claw type supporting structure 21; the two-jaw support structure 21 is clamped with the grooves 311 of the outer reinforcing ring 31 by jaws, so that the carcass 2 is connected with the outer reinforcing ring 31.
Further, the carcass 2 is cast by using polyurethane obtained by a secondary foaming method as a base material.
The cross section of the tread 1 in the circumferential direction adopts an arch design, wherein the upper arc of the cross section is in a multi-section arc tangent modeling, and the thickness of the shoulders on two sides is lower than that of the central area of the tread; the tread 1 is produced by a rolling method using a wear-resistant material suitable for contact with the ground as a base material.
The invention is described in further detail below with reference to the drawings and examples.
Example 1
FIG. 1 is a schematic illustration of a non-pneumatic tire structure based on a concave hexagonal negative Poisson's ratio support structure according to the present invention. The non-pneumatic tire comprises a tread 1, a carcass 2 and a negative poisson's ratio supporting structure from outside to inside in sequence along the radial direction. The inner side of the tread 1 and the outer side of the carcass 2 are glued into a whole. The carcass 2 is made of polyurethane foaming material with negative poisson ratio. The negative poisson's ratio support structure comprises an outer reinforcing ring 31 which is clamped and connected with the inner side of the carcass 2, an inner reinforcing ring 32 which is connected with the rim of the wheel, and a negative poisson's ratio multicellular support body 33 which is connected with the inner and outer reinforcing rings. The multicellular support is formed by mutually connecting a plurality of concave hexagonal unit structures 331 which are distributed in a concentric annular shape through connecting cell arms 332, wherein each concave hexagonal unit structure 331 is formed by orthogonally nesting and connecting a pair of concave hexagonal unit structures. Wherein, the outermost ring cell of the negative poisson ratio multicell support body 33 is connected with the inner ring surface of the outer reinforcing ring 31, and the innermost ring cell is connected with the outer ring surface of the inner reinforcing ring 32.
Fig. 2 is a schematic diagram of a concave hexagonal negative poisson ratio unit cell structure. The concave hexagonal unit cell structure 331 is formed by orthogonally nesting and connecting a pair of concave hexagonal unit cell structures consisting of 8 curved cell arms 333 and 4 supporting cell arms 334 in two concave points 335. In order to ensure the negative poisson's ratio, the inner angles of the concave hexagonal cell structures formed by the curved cell arms 333 and the supporting cell arms 334 at the upper concave points and the lower concave points may be the same or different, but all the angles must be greater than 180 ° to enable the hexagons to meet the concave characteristics. At the same time, a certain radial spacing between the two concave points 335 needs to be ensured. In this embodiment, the inner angles at the upper and lower pits are all 210 °, and the radial spacing of the inner pits 335 is 15mm. The curved arms 333 and the support arms 334 may be cross-sectional beams, or they may be cross-sectional beams that are circular or rectangular. The materials of the bent cell arms 333 and the supporting cell arms 334 can be the same or different, and the cell arm raw materials are metal, rubber, ceramic, fiber reinforcement, nylon or polymer. In this embodiment, the curved cell arm 333 is a square-shaped cross-section beam made of a compressive aluminum alloy material, and the supporting cell arm 334 is a square-shaped cross-section beam made of a tensile nylon material.
Fig. 3 is a schematic diagram of a negative poisson's ratio support structure according to the present embodiment. The concave hexagonal cell structures 331 are connected to each other in the circumferential direction by supporting cell walls 334 that share both sides, forming a single-turn negative poisson's ratio multicell structure. The multi-turn negative poisson ratio multi-cell structure is radially arranged, and upper concave points 335 of adjacent turns are connected through connecting cell arms 332, so that a single-layer negative poisson ratio multi-cell structure is formed. The multiple layers of negative poisson's ratio multicellular structures are connected to each other axially by support cell walls 334 on either side in common to form a complete negative poisson's ratio multicellular support 33. The number of unit cells 331 in one turn of the multi-cell support 33 in the circumferential direction is called a cycle number t, the number of unit cells in the radial direction is called a turn number c, the number of unit cells in the rotation axis direction is called a layer number l, and the cycle number, the turn number and the layer number of the multi-cell support 33 are different according to different performance requirements of the tire. In addition, the geometry of the cell structure 331 is uniform in each turn, and varies from turn to turn depending on the different performance requirements of the tire. In this embodiment, the number of cycles t=12, the number of cycles c=4, the number of layers l=2, and the geometric dimension of the unit cell structure between different coils gradually increases from inside to outside along the radial direction. In this embodiment, the outer reinforcing ring 31 has a ring structure with a certain thickness, the outer side of the circumferential section of the outer reinforcing ring is provided with an inward concave groove 311, and the inner side of the outer reinforcing ring is connected with the outermost unit cell structure of the negative poisson's ratio multicellular support 33. The inner reinforcing ring 32 is an annular structure with a certain thickness, the circumferential section of the inner reinforcing ring is a matrix, the outer side of the section is connected with the innermost unit cell structure of the negative poisson ratio multicellular support body 33, and the inner side of the section is connected with the rim of the wheel. When bearing radial load, the negative poisson ratio supporting structure can shrink locally to the loaded area, so that the equivalent strength and rigidity of the structure are improved, and the bearing performance of the tire is improved. The lateral negative poisson's ratio effect of the support structure then increases the lateral stability of the tyre during running.
FIG. 4 is a schematic view of a tread circumferential cross-section. The cross section of the tread 1 in the circumferential direction adopts an arch design, wherein the upper arc of the cross section is in a multi-section arc tangent modeling, and the thickness of the shoulders on two sides is lower than that of the central area of the tread. The central region of the tread in the first embodiment adopts an arc segment with radius R2The tire shoulders on two sides adopt arc sections with radius R1/> The center arc section and the shoulder arc section are respectively tangent to the B, C points. The tread is made from wear-resistant materials suitable for contacting with the ground, such as dandelion rubber and eucommia ulmoides rubber, serving as matrix materials by a calendaring method. The arc design is adopted in the tread center area, so that tread wear during small load can be reduced, the grounding area during large load can be increased, and the tire adhesion performance can be improved. The circular arc tire shoulder can improve the drainage of the tire, so that accumulated water below the tire is thrown out faster, and the grip of the tire on a wet road surface is improved.
FIG. 5 is a schematic representation of a circumferential cross-section of the connection of the tread, carcass and outer reinforcing ring of the present invention. The carcass 2 is a toroidal structure having a thickness in which the outer side of the carcass 2 is glued as one piece with the inner side of the tread 1. Inside the carcass 1 is a two-claw type supporting structure 21, and protruding claws 211 are respectively provided at both side edges of the two-claw type supporting structure 21. The tyre body 2 is clamped with the groove 311 of the outer reinforcing ring 31 through the clamping jaws 211, so that the tyre body 2 is connected with the outer reinforcing ring 31, the connection strength of the tyre body 2 and the outer reinforcing ring 31 is enhanced, and the safety of the tyre is obviously improved. Meanwhile, the detachable connection mode also reduces the replacement difficulty and maintenance cost of the non-pneumatic tire. The matrix 2 is cast by taking polyurethane obtained by a secondary foaming method as a matrix material, is an isotropic negative poisson ratio material, and further improves the bearing performance and stability of the non-pneumatic tire. Meanwhile, the negative poisson ratio carcass has good impact resistance and shock resistance, and is beneficial to improving the running smoothness of the vehicle.
Example 2
Fig. 6 is a schematic diagram of a concave hexagonal negative poisson's ratio cell structure according to example 2 of the present invention. The concave hexagonal unit cell structure 331 is formed by orthogonally nesting and connecting a pair of concave hexagonal unit cell structures consisting of 8 curved cell arms 333 and 4 supporting cell arms 334 in two concave points 335. In order to ensure the negative poisson's ratio, the inner angles of the concave hexagonal cell structures formed by the curved cell arms 333 and the supporting cell arms 334 at the upper concave points and the lower concave points may be the same or different, but all the angles must be greater than 180 ° to enable the hexagons to meet the concave characteristics. At the same time, a certain radial spacing between the two concave points 335 needs to be ensured. In this embodiment, the inner included angle of the upper concave point is 200 °, the inner included angles of the upper concave point are 190 °, and the radial spacing of the inner concave points 335 is 10mm. The curved arms 333 are circular cross-sectional beams of compressive ceramic material and the support arms 334 are circular cross-sectional beams of tensile fibrous material.
Fig. 7 is a schematic diagram of a negative poisson's ratio support structure according to the present embodiment. The concave hexagonal cell structures 331 are connected to each other in the circumferential direction by supporting cell walls 334 sharing two sides, so as to form a single-loop negative poisson ratio multicell structure. The multi-turn negative poisson ratio multi-cell structure is radially arranged, and upper concave points 335 of adjacent turns are connected through connecting cell arms 332, so that a single-layer negative poisson ratio multi-cell structure is formed. The multiple layers of negative poisson's ratio multicellular structures are connected to each other axially by support cell walls 334 on either side in common to form a complete negative poisson's ratio multicellular support 33. The number of unit cells 331 in one turn of the multi-cell support 33 in the circumferential direction is called a cycle number t, the number of unit cells in the radial direction is called a turn number c, the number of unit cells in the rotation axis direction is called a layer number l, and the cycle number, the turn number and the layer number of the multi-cell support 33 are different according to different performance requirements of the tire. In addition, the geometry of the cell structure 331 is uniform in each turn, and varies from turn to turn depending on the different performance requirements of the tire. In this embodiment, the number of cycles t=24, the number of cycles c=2, the number of layers l=4, and the geometric dimension of the unit cell structure between different coils gradually increases from inside to outside along the radial direction. The outer reinforcing ring 31 has a ring structure with a certain thickness, the outer side of the circumferential section of the outer reinforcing ring is provided with an inward concave groove 311, and the inner side of the circumferential section is connected with the outermost unit cell structure of the negative poisson ratio multicellular support 33. The inner reinforcing ring 32 is an annular structure with a certain thickness, the circumferential section of the inner reinforcing ring is a matrix, the outer side of the section is connected with the innermost unit cell structure of the negative poisson ratio multicellular support body 33, and the inner side of the section is connected with the rim of the wheel. When bearing radial load, the negative poisson ratio supporting structure can shrink locally to the loaded area, so that the equivalent strength and rigidity of the structure are improved, and the bearing performance of the tire is improved. The lateral negative poisson's ratio effect of the support structure then increases the lateral stability of the tyre during running.
Claims (1)
1. A non-pneumatic tire based on a concave hexagonal negative poisson ratio supporting structure is characterized by sequentially comprising a tread (1), a carcass (2) and the negative poisson ratio supporting structure from outside to inside along the radial direction; the inner side of the tread (1) is glued with the outer side of the carcass (2) into a whole, and the carcass (2) is made of polyurethane foaming materials with negative Poisson ratio characteristics;
The negative poisson ratio supporting structure comprises an outer reinforcing ring (31) which is clamped and connected with the inner side of the carcass (2), an inner reinforcing ring (32) which is connected with the rim of the wheel, and a negative poisson ratio multicellular supporting body (33) which is connected with the inner reinforcing ring and the outer reinforcing ring; the negative poisson ratio multicell support body (33) is formed by mutually connecting a plurality of concave hexagonal unit cell structures (331) which are concentrically and annularly distributed through connecting cell arms (332), and each concave hexagonal unit cell structure (331) is formed by orthogonally and nestingly connecting a pair of concave hexagonal unit structures;
Each concave hexagonal unit structure is in a left-right symmetrical dovetail shape, two equal-length vertical edges on the outer side are supporting cell arms (334), the length is H, four equal-length oblique edges on the inner side are bending cell arms (333), the length is L, the included angle between the supporting cell arms (334) and the bending cell arms (333) is theta, theta is less than 90 degrees, and the length relation between the supporting cell arms (334) and the bending cell arms (333) meets the formula H & gt2.Costheta.L; the two concave hexagons are orthogonally arranged and are intersected with the two concave points (335) to form a complete concave hexagonal unit cell structure (331);
The concave hexagonal single cell structures (331) are connected with each other in the radial direction through connecting cell arms (332), and are connected with each other in the circumferential direction and the rotation axis direction through shared supporting cell arms (334), so that a negative poisson ratio multicellular support body (33) with a periodic single cell structure in three directions is formed;
The inner included angles of a pair of concave hexagonal unit structures formed by the bending cell arms (333) and the supporting cell arms (334) are larger than 180 degrees at the upper concave points and the lower concave points, and the initial radial distance between the two concave points (335) is larger than half of the length of the supporting cell arms (334);
The outer reinforcing ring (31) is of an annular structure, the outer side of the circumferential section of the outer reinforcing ring is provided with an inwards concave groove (311), and the inner side of the outer reinforcing ring is connected with the outermost unit cell structure of the negative poisson ratio multicellular support body (33); the inner reinforcing ring (32) is of an annular structure, the circumferential section of the inner reinforcing ring is a matrix, the outer side of the section is connected with the innermost unit cell structure of the negative poisson ratio multicellular support body (33), and the inner side of the section is connected with the wheel rim;
The tire body (2) is of a ring-shaped structure, the inner side of the tire body (2) is provided with a two-claw type supporting structure (21), and the two-claw type supporting structure (21) is clamped with a groove (311) of the outer reinforcing ring (31) through claws, so that the tire body (2) is connected with the outer reinforcing ring (31);
The matrix (2) is formed by casting polyurethane obtained by a secondary foaming method as a matrix material;
The bending cell arm (333), the supporting cell arm (334) and the connecting cell arm (332) are constant cross-section beams or variable cross-section beams, and the cross section is circular or rectangular;
the bending cell arm (333), the supporting cell arm (334) and the connecting cell arm (332) are made of metal, rubber, ceramic, fiber reinforcement, nylon or polymer;
the geometry of the cell structures (331) in each turn is uniform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN108859619B (en) * | 2018-07-10 | 2020-05-12 | 哈尔滨商业大学 | Automobile tire safety device and parameter setting method thereof |
| CN109807310A (en) * | 2019-01-14 | 2019-05-28 | 南京航空航天大学 | Model casting preparation method with negative poisson's ratio characteristic open celled foam aluminum material |
| CN111003212A (en) * | 2019-12-20 | 2020-04-14 | 北京工业大学 | Mars tire with shape memory alloy lattice structure |
| CN113468665B (en) * | 2021-07-02 | 2024-06-07 | 南京英田光学工程股份有限公司 | Three-dimensional impact-resistant body with negative poisson ratio characteristic and design method thereof |
| CN115030303B (en) * | 2022-06-20 | 2023-03-10 | 东北大学 | Internal-locking assembled three-dimensional reentry honeycomb type negative poisson ratio three-dimensional grid |
| CN116168784B (en) * | 2023-02-28 | 2023-08-29 | 哈尔滨工业大学 | Negative poisson ratio structural design method for self-similar hierarchical assembly |
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| CN102529583A (en) * | 2010-12-10 | 2012-07-04 | 马正东 | Ultralightweight runflat tires based upon negative poisson ratio (npr) auxetic structures |
| CN106739828A (en) * | 2016-12-27 | 2017-05-31 | 青岛双星轮胎工业有限公司 | Non-inflatable tyre |
| CN208148963U (en) * | 2018-01-24 | 2018-11-27 | 南京理工大学 | Non-inflatable tyre based on indent hexagon negative poisson's ratio support construction |
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| US8609220B2 (en) * | 2010-04-08 | 2013-12-17 | Compagnie Generale Des Etablissements Michelin | Shear compliant hexagonal meso-structures having high shear strength and high shear strain |
| US20180015785A1 (en) * | 2014-03-01 | 2018-01-18 | Bridgestone Americas Tire Operations, Llc | Non-pneumatic tire assembly including a replaceable tread element |
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| CN102529583A (en) * | 2010-12-10 | 2012-07-04 | 马正东 | Ultralightweight runflat tires based upon negative poisson ratio (npr) auxetic structures |
| CN106739828A (en) * | 2016-12-27 | 2017-05-31 | 青岛双星轮胎工业有限公司 | Non-inflatable tyre |
| CN208148963U (en) * | 2018-01-24 | 2018-11-27 | 南京理工大学 | Non-inflatable tyre based on indent hexagon negative poisson's ratio support construction |
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